Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1 | // Copyright 2017 The Bazel Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
Alan Donovan | e3deafe | 2018-10-23 11:05:09 -0400 | [diff] [blame] | 5 | package starlark |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 6 | |
| 7 | // This file defines the library of built-ins. |
| 8 | // |
| 9 | // Built-ins must explicitly check the "frozen" flag before updating |
| 10 | // mutable types such as lists and dicts. |
| 11 | |
| 12 | import ( |
alandonovan | 30ae18b | 2019-05-28 16:29:25 -0400 | [diff] [blame] | 13 | "errors" |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 14 | "fmt" |
alandonovan | 3b7e02e | 2020-11-11 12:03:41 -0500 | [diff] [blame] | 15 | "math" |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 16 | "math/big" |
| 17 | "os" |
| 18 | "sort" |
| 19 | "strconv" |
| 20 | "strings" |
| 21 | "unicode" |
alandonovan | e35f71a | 2019-05-14 14:50:48 -0400 | [diff] [blame] | 22 | "unicode/utf16" |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 23 | "unicode/utf8" |
| 24 | |
Alan Donovan | 6beab7e | 2018-10-31 17:53:09 -0400 | [diff] [blame] | 25 | "go.starlark.net/syntax" |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 26 | ) |
| 27 | |
| 28 | // Universe defines the set of universal built-ins, such as None, True, and len. |
| 29 | // |
| 30 | // The Go application may add or remove items from the |
Alan Donovan | e3deafe | 2018-10-23 11:05:09 -0400 | [diff] [blame] | 31 | // universe dictionary before Starlark evaluation begins. |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 32 | // All values in the dictionary must be immutable. |
Alan Donovan | e3deafe | 2018-10-23 11:05:09 -0400 | [diff] [blame] | 33 | // Starlark programs cannot modify the dictionary. |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 34 | var Universe StringDict |
| 35 | |
| 36 | func init() { |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 37 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#built-in-constants-and-functions |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 38 | Universe = StringDict{ |
| 39 | "None": None, |
| 40 | "True": True, |
| 41 | "False": False, |
| 42 | "any": NewBuiltin("any", any), |
| 43 | "all": NewBuiltin("all", all), |
| 44 | "bool": NewBuiltin("bool", bool_), |
alandonovan | ebe61bd | 2021-02-12 16:57:32 -0500 | [diff] [blame] | 45 | "bytes": NewBuiltin("bytes", bytes_), |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 46 | "chr": NewBuiltin("chr", chr), |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 47 | "dict": NewBuiltin("dict", dict), |
| 48 | "dir": NewBuiltin("dir", dir), |
| 49 | "enumerate": NewBuiltin("enumerate", enumerate), |
alandonovan | 30ae18b | 2019-05-28 16:29:25 -0400 | [diff] [blame] | 50 | "fail": NewBuiltin("fail", fail), |
alandonovan | 3b7e02e | 2020-11-11 12:03:41 -0500 | [diff] [blame] | 51 | "float": NewBuiltin("float", float), |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 52 | "getattr": NewBuiltin("getattr", getattr), |
| 53 | "hasattr": NewBuiltin("hasattr", hasattr), |
| 54 | "hash": NewBuiltin("hash", hash), |
| 55 | "int": NewBuiltin("int", int_), |
| 56 | "len": NewBuiltin("len", len_), |
| 57 | "list": NewBuiltin("list", list), |
| 58 | "max": NewBuiltin("max", minmax), |
| 59 | "min": NewBuiltin("min", minmax), |
| 60 | "ord": NewBuiltin("ord", ord), |
| 61 | "print": NewBuiltin("print", print), |
| 62 | "range": NewBuiltin("range", range_), |
| 63 | "repr": NewBuiltin("repr", repr), |
| 64 | "reversed": NewBuiltin("reversed", reversed), |
| 65 | "set": NewBuiltin("set", set), // requires resolve.AllowSet |
| 66 | "sorted": NewBuiltin("sorted", sorted), |
| 67 | "str": NewBuiltin("str", str), |
| 68 | "tuple": NewBuiltin("tuple", tuple), |
| 69 | "type": NewBuiltin("type", type_), |
| 70 | "zip": NewBuiltin("zip", zip), |
| 71 | } |
| 72 | } |
| 73 | |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 74 | // methods of built-in types |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 75 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#built-in-methods |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 76 | var ( |
alandonovan | ebe61bd | 2021-02-12 16:57:32 -0500 | [diff] [blame] | 77 | bytesMethods = map[string]*Builtin{ |
| 78 | "elems": NewBuiltin("elems", bytes_elems), |
| 79 | } |
| 80 | |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 81 | dictMethods = map[string]*Builtin{ |
| 82 | "clear": NewBuiltin("clear", dict_clear), |
| 83 | "get": NewBuiltin("get", dict_get), |
| 84 | "items": NewBuiltin("items", dict_items), |
| 85 | "keys": NewBuiltin("keys", dict_keys), |
| 86 | "pop": NewBuiltin("pop", dict_pop), |
| 87 | "popitem": NewBuiltin("popitem", dict_popitem), |
| 88 | "setdefault": NewBuiltin("setdefault", dict_setdefault), |
| 89 | "update": NewBuiltin("update", dict_update), |
| 90 | "values": NewBuiltin("values", dict_values), |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 91 | } |
| 92 | |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 93 | listMethods = map[string]*Builtin{ |
| 94 | "append": NewBuiltin("append", list_append), |
| 95 | "clear": NewBuiltin("clear", list_clear), |
| 96 | "extend": NewBuiltin("extend", list_extend), |
| 97 | "index": NewBuiltin("index", list_index), |
| 98 | "insert": NewBuiltin("insert", list_insert), |
| 99 | "pop": NewBuiltin("pop", list_pop), |
| 100 | "remove": NewBuiltin("remove", list_remove), |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 101 | } |
| 102 | |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 103 | stringMethods = map[string]*Builtin{ |
| 104 | "capitalize": NewBuiltin("capitalize", string_capitalize), |
| 105 | "codepoint_ords": NewBuiltin("codepoint_ords", string_iterable), |
| 106 | "codepoints": NewBuiltin("codepoints", string_iterable), // sic |
| 107 | "count": NewBuiltin("count", string_count), |
| 108 | "elem_ords": NewBuiltin("elem_ords", string_iterable), |
| 109 | "elems": NewBuiltin("elems", string_iterable), // sic |
| 110 | "endswith": NewBuiltin("endswith", string_startswith), // sic |
| 111 | "find": NewBuiltin("find", string_find), |
| 112 | "format": NewBuiltin("format", string_format), |
| 113 | "index": NewBuiltin("index", string_index), |
| 114 | "isalnum": NewBuiltin("isalnum", string_isalnum), |
| 115 | "isalpha": NewBuiltin("isalpha", string_isalpha), |
| 116 | "isdigit": NewBuiltin("isdigit", string_isdigit), |
| 117 | "islower": NewBuiltin("islower", string_islower), |
| 118 | "isspace": NewBuiltin("isspace", string_isspace), |
| 119 | "istitle": NewBuiltin("istitle", string_istitle), |
| 120 | "isupper": NewBuiltin("isupper", string_isupper), |
| 121 | "join": NewBuiltin("join", string_join), |
| 122 | "lower": NewBuiltin("lower", string_lower), |
| 123 | "lstrip": NewBuiltin("lstrip", string_strip), // sic |
| 124 | "partition": NewBuiltin("partition", string_partition), |
| 125 | "replace": NewBuiltin("replace", string_replace), |
| 126 | "rfind": NewBuiltin("rfind", string_rfind), |
| 127 | "rindex": NewBuiltin("rindex", string_rindex), |
| 128 | "rpartition": NewBuiltin("rpartition", string_partition), // sic |
| 129 | "rsplit": NewBuiltin("rsplit", string_split), // sic |
| 130 | "rstrip": NewBuiltin("rstrip", string_strip), // sic |
| 131 | "split": NewBuiltin("split", string_split), |
| 132 | "splitlines": NewBuiltin("splitlines", string_splitlines), |
| 133 | "startswith": NewBuiltin("startswith", string_startswith), |
| 134 | "strip": NewBuiltin("strip", string_strip), |
| 135 | "title": NewBuiltin("title", string_title), |
| 136 | "upper": NewBuiltin("upper", string_upper), |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 137 | } |
| 138 | |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 139 | setMethods = map[string]*Builtin{ |
| 140 | "union": NewBuiltin("union", set_union), |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 141 | } |
| 142 | ) |
| 143 | |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 144 | func builtinAttr(recv Value, name string, methods map[string]*Builtin) (Value, error) { |
| 145 | b := methods[name] |
| 146 | if b == nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 147 | return nil, nil // no such method |
| 148 | } |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 149 | return b.BindReceiver(recv), nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 150 | } |
| 151 | |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 152 | func builtinAttrNames(methods map[string]*Builtin) []string { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 153 | names := make([]string, 0, len(methods)) |
| 154 | for name := range methods { |
| 155 | names = append(names, name) |
| 156 | } |
| 157 | sort.Strings(names) |
| 158 | return names |
| 159 | } |
| 160 | |
alandonovan | 4cbd896 | 2017-10-19 13:18:36 -0400 | [diff] [blame] | 161 | // ---- built-in functions ---- |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 162 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 163 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#all |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 164 | func all(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 165 | var iterable Iterable |
| 166 | if err := UnpackPositionalArgs("all", args, kwargs, 1, &iterable); err != nil { |
| 167 | return nil, err |
| 168 | } |
| 169 | iter := iterable.Iterate() |
| 170 | defer iter.Done() |
| 171 | var x Value |
| 172 | for iter.Next(&x) { |
| 173 | if !x.Truth() { |
| 174 | return False, nil |
| 175 | } |
| 176 | } |
| 177 | return True, nil |
| 178 | } |
| 179 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 180 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#any |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 181 | func any(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 182 | var iterable Iterable |
Josh Bleecher Snyder | f50f359 | 2018-12-12 11:18:09 -0800 | [diff] [blame] | 183 | if err := UnpackPositionalArgs("any", args, kwargs, 1, &iterable); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 184 | return nil, err |
| 185 | } |
| 186 | iter := iterable.Iterate() |
| 187 | defer iter.Done() |
| 188 | var x Value |
| 189 | for iter.Next(&x) { |
| 190 | if x.Truth() { |
| 191 | return True, nil |
| 192 | } |
| 193 | } |
| 194 | return False, nil |
| 195 | } |
| 196 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 197 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#bool |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 198 | func bool_(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 199 | var x Value = False |
| 200 | if err := UnpackPositionalArgs("bool", args, kwargs, 0, &x); err != nil { |
| 201 | return nil, err |
| 202 | } |
| 203 | return x.Truth(), nil |
| 204 | } |
| 205 | |
alandonovan | ebe61bd | 2021-02-12 16:57:32 -0500 | [diff] [blame] | 206 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#bytes |
| 207 | func bytes_(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 208 | if len(kwargs) > 0 { |
| 209 | return nil, fmt.Errorf("bytes does not accept keyword arguments") |
| 210 | } |
| 211 | if len(args) != 1 { |
| 212 | return nil, fmt.Errorf("bytes: got %d arguments, want exactly 1", len(args)) |
| 213 | } |
| 214 | switch x := args[0].(type) { |
| 215 | case Bytes: |
| 216 | return x, nil |
| 217 | case String: |
| 218 | // Invalid encodings are replaced by that of U+FFFD. |
| 219 | return Bytes(utf8Transcode(string(x))), nil |
| 220 | case Iterable: |
| 221 | // iterable of numeric byte values |
| 222 | var buf strings.Builder |
| 223 | if n := Len(x); n >= 0 { |
| 224 | // common case: known length |
| 225 | buf.Grow(n) |
| 226 | } |
| 227 | iter := x.Iterate() |
| 228 | defer iter.Done() |
| 229 | var elem Value |
| 230 | var b byte |
| 231 | for i := 0; iter.Next(&elem); i++ { |
| 232 | if err := AsInt(elem, &b); err != nil { |
| 233 | return nil, fmt.Errorf("bytes: at index %d, %s", i, err) |
| 234 | } |
| 235 | buf.WriteByte(b) |
| 236 | } |
| 237 | return Bytes(buf.String()), nil |
| 238 | |
| 239 | default: |
| 240 | // Unlike string(foo), which stringifies it, bytes(foo) is an error. |
| 241 | return nil, fmt.Errorf("bytes: got %s, want string, bytes, or iterable of ints", x.Type()) |
| 242 | } |
| 243 | } |
| 244 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 245 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#chr |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 246 | func chr(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 247 | if len(kwargs) > 0 { |
| 248 | return nil, fmt.Errorf("chr does not accept keyword arguments") |
| 249 | } |
| 250 | if len(args) != 1 { |
| 251 | return nil, fmt.Errorf("chr: got %d arguments, want 1", len(args)) |
| 252 | } |
| 253 | i, err := AsInt32(args[0]) |
| 254 | if err != nil { |
tdakkota | 88a1093 | 2020-09-29 15:29:13 +0300 | [diff] [blame] | 255 | return nil, fmt.Errorf("chr: %s", err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 256 | } |
| 257 | if i < 0 { |
| 258 | return nil, fmt.Errorf("chr: Unicode code point %d out of range (<0)", i) |
| 259 | } |
| 260 | if i > unicode.MaxRune { |
| 261 | return nil, fmt.Errorf("chr: Unicode code point U+%X out of range (>0x10FFFF)", i) |
| 262 | } |
alandonovan | 3353e41 | 2020-06-11 11:19:22 -0400 | [diff] [blame] | 263 | return String(string(rune(i))), nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 264 | } |
| 265 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 266 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#dict |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 267 | func dict(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 268 | if len(args) > 1 { |
| 269 | return nil, fmt.Errorf("dict: got %d arguments, want at most 1", len(args)) |
| 270 | } |
| 271 | dict := new(Dict) |
| 272 | if err := updateDict(dict, args, kwargs); err != nil { |
| 273 | return nil, fmt.Errorf("dict: %v", err) |
| 274 | } |
| 275 | return dict, nil |
| 276 | } |
| 277 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 278 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#dir |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 279 | func dir(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 280 | if len(kwargs) > 0 { |
| 281 | return nil, fmt.Errorf("dir does not accept keyword arguments") |
| 282 | } |
| 283 | if len(args) != 1 { |
| 284 | return nil, fmt.Errorf("dir: got %d arguments, want 1", len(args)) |
| 285 | } |
| 286 | |
| 287 | var names []string |
| 288 | if x, ok := args[0].(HasAttrs); ok { |
| 289 | names = x.AttrNames() |
| 290 | } |
alandonovan | cb523da | 2019-04-01 23:09:56 -0400 | [diff] [blame] | 291 | sort.Strings(names) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 292 | elems := make([]Value, len(names)) |
| 293 | for i, name := range names { |
| 294 | elems[i] = String(name) |
| 295 | } |
| 296 | return NewList(elems), nil |
| 297 | } |
| 298 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 299 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#enumerate |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 300 | func enumerate(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 301 | var iterable Iterable |
| 302 | var start int |
| 303 | if err := UnpackPositionalArgs("enumerate", args, kwargs, 1, &iterable, &start); err != nil { |
| 304 | return nil, err |
| 305 | } |
| 306 | |
| 307 | iter := iterable.Iterate() |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 308 | defer iter.Done() |
| 309 | |
| 310 | var pairs []Value |
| 311 | var x Value |
| 312 | |
| 313 | if n := Len(iterable); n >= 0 { |
| 314 | // common case: known length |
| 315 | pairs = make([]Value, 0, n) |
| 316 | array := make(Tuple, 2*n) // allocate a single backing array |
| 317 | for i := 0; iter.Next(&x); i++ { |
| 318 | pair := array[:2:2] |
| 319 | array = array[2:] |
| 320 | pair[0] = MakeInt(start + i) |
| 321 | pair[1] = x |
| 322 | pairs = append(pairs, pair) |
| 323 | } |
| 324 | } else { |
| 325 | // non-sequence (unknown length) |
| 326 | for i := 0; iter.Next(&x); i++ { |
| 327 | pair := Tuple{MakeInt(start + i), x} |
| 328 | pairs = append(pairs, pair) |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | return NewList(pairs), nil |
| 333 | } |
| 334 | |
alandonovan | 30ae18b | 2019-05-28 16:29:25 -0400 | [diff] [blame] | 335 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#fail |
| 336 | func fail(thread *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 337 | sep := " " |
| 338 | if err := UnpackArgs("fail", nil, kwargs, "sep?", &sep); err != nil { |
| 339 | return nil, err |
| 340 | } |
| 341 | buf := new(strings.Builder) |
| 342 | buf.WriteString("fail: ") |
| 343 | for i, v := range args { |
| 344 | if i > 0 { |
| 345 | buf.WriteString(sep) |
| 346 | } |
| 347 | if s, ok := AsString(v); ok { |
| 348 | buf.WriteString(s) |
| 349 | } else { |
| 350 | writeValue(buf, v, nil) |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | return nil, errors.New(buf.String()) |
| 355 | } |
| 356 | |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 357 | func float(thread *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 358 | if len(kwargs) > 0 { |
| 359 | return nil, fmt.Errorf("float does not accept keyword arguments") |
| 360 | } |
| 361 | if len(args) == 0 { |
| 362 | return Float(0.0), nil |
| 363 | } |
| 364 | if len(args) != 1 { |
| 365 | return nil, fmt.Errorf("float got %d arguments, wants 1", len(args)) |
| 366 | } |
| 367 | switch x := args[0].(type) { |
| 368 | case Bool: |
| 369 | if x { |
| 370 | return Float(1.0), nil |
| 371 | } else { |
| 372 | return Float(0.0), nil |
| 373 | } |
| 374 | case Int: |
alandonovan | 3b7e02e | 2020-11-11 12:03:41 -0500 | [diff] [blame] | 375 | return x.finiteFloat() |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 376 | case Float: |
| 377 | return x, nil |
| 378 | case String: |
alandonovan | 3b7e02e | 2020-11-11 12:03:41 -0500 | [diff] [blame] | 379 | if x == "" { |
| 380 | return nil, fmt.Errorf("float: empty string") |
| 381 | } |
| 382 | // +/- NaN or Inf or Infinity (case insensitive)? |
| 383 | s := string(x) |
| 384 | switch x[len(x)-1] { |
| 385 | case 'y', 'Y': |
| 386 | if strings.EqualFold(s, "infinity") || strings.EqualFold(s, "+infinity") { |
| 387 | return inf, nil |
| 388 | } else if strings.EqualFold(s, "-infinity") { |
| 389 | return neginf, nil |
| 390 | } |
| 391 | case 'f', 'F': |
| 392 | if strings.EqualFold(s, "inf") || strings.EqualFold(s, "+inf") { |
| 393 | return inf, nil |
| 394 | } else if strings.EqualFold(s, "-inf") { |
| 395 | return neginf, nil |
| 396 | } |
| 397 | case 'n', 'N': |
| 398 | if strings.EqualFold(s, "nan") || strings.EqualFold(s, "+nan") || strings.EqualFold(s, "-nan") { |
| 399 | return nan, nil |
| 400 | } |
| 401 | } |
| 402 | f, err := strconv.ParseFloat(s, 64) |
| 403 | if math.IsInf(f, 0) { |
| 404 | return nil, fmt.Errorf("floating-point number too large") |
| 405 | } |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 406 | if err != nil { |
alandonovan | 3b7e02e | 2020-11-11 12:03:41 -0500 | [diff] [blame] | 407 | return nil, fmt.Errorf("invalid float literal: %s", s) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 408 | } |
| 409 | return Float(f), nil |
| 410 | default: |
| 411 | return nil, fmt.Errorf("float got %s, want number or string", x.Type()) |
| 412 | } |
| 413 | } |
| 414 | |
alandonovan | 3b7e02e | 2020-11-11 12:03:41 -0500 | [diff] [blame] | 415 | var ( |
| 416 | inf = Float(math.Inf(+1)) |
| 417 | neginf = Float(math.Inf(-1)) |
| 418 | nan = Float(math.NaN()) |
| 419 | ) |
| 420 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 421 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#getattr |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 422 | func getattr(thread *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 423 | var object, dflt Value |
| 424 | var name string |
| 425 | if err := UnpackPositionalArgs("getattr", args, kwargs, 2, &object, &name, &dflt); err != nil { |
| 426 | return nil, err |
| 427 | } |
alandonovan | 653c157 | 2018-02-26 17:11:13 -0500 | [diff] [blame] | 428 | if object, ok := object.(HasAttrs); ok { |
| 429 | v, err := object.Attr(name) |
| 430 | if err != nil { |
| 431 | // An error could mean the field doesn't exist, |
| 432 | // or it exists but could not be computed. |
| 433 | if dflt != nil { |
| 434 | return dflt, nil |
| 435 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 436 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 437 | } |
alandonovan | 653c157 | 2018-02-26 17:11:13 -0500 | [diff] [blame] | 438 | if v != nil { |
| 439 | return v, nil |
| 440 | } |
| 441 | // (nil, nil) => no such field |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 442 | } |
| 443 | if dflt != nil { |
| 444 | return dflt, nil |
| 445 | } |
alandonovan | f223ef8 | 2019-03-12 16:06:40 -0400 | [diff] [blame] | 446 | return nil, fmt.Errorf("getattr: %s has no .%s field or method", object.Type(), name) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 447 | } |
| 448 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 449 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#hasattr |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 450 | func hasattr(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 451 | var object Value |
| 452 | var name string |
| 453 | if err := UnpackPositionalArgs("hasattr", args, kwargs, 2, &object, &name); err != nil { |
| 454 | return nil, err |
| 455 | } |
| 456 | if object, ok := object.(HasAttrs); ok { |
alandonovan | cada868 | 2018-02-26 12:59:19 -0500 | [diff] [blame] | 457 | v, err := object.Attr(name) |
| 458 | if err == nil { |
| 459 | return Bool(v != nil), nil |
| 460 | } |
| 461 | |
| 462 | // An error does not conclusively indicate presence or |
| 463 | // absence of a field: it could occur while computing |
| 464 | // the value of a present attribute, or it could be a |
| 465 | // "no such attribute" error with details. |
| 466 | for _, x := range object.AttrNames() { |
| 467 | if x == name { |
| 468 | return True, nil |
| 469 | } |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 470 | } |
| 471 | } |
| 472 | return False, nil |
| 473 | } |
| 474 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 475 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#hash |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 476 | func hash(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | ebe61bd | 2021-02-12 16:57:32 -0500 | [diff] [blame] | 477 | var x Value |
| 478 | if err := UnpackPositionalArgs("hash", args, kwargs, 1, &x); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 479 | return nil, err |
| 480 | } |
alandonovan | e35f71a | 2019-05-14 14:50:48 -0400 | [diff] [blame] | 481 | |
alandonovan | ebe61bd | 2021-02-12 16:57:32 -0500 | [diff] [blame] | 482 | var h int |
| 483 | switch x := x.(type) { |
| 484 | case String: |
| 485 | // The Starlark spec requires that the hash function be |
| 486 | // deterministic across all runs, motivated by the need |
| 487 | // for reproducibility of builds. Thus we cannot call |
| 488 | // String.Hash, which uses the fastest implementation |
| 489 | // available, because as varies across process restarts, |
| 490 | // and may evolve with the implementation. |
| 491 | h = int(javaStringHash(string(x))) |
| 492 | case Bytes: |
| 493 | h = int(softHashString(string(x))) // FNV32 |
| 494 | default: |
| 495 | return nil, fmt.Errorf("hash: got %s, want string or bytes", x.Type()) |
| 496 | } |
| 497 | return MakeInt(h), nil |
alandonovan | e35f71a | 2019-05-14 14:50:48 -0400 | [diff] [blame] | 498 | } |
| 499 | |
| 500 | // javaStringHash returns the same hash as would be produced by |
| 501 | // java.lang.String.hashCode. This requires transcoding the string to |
| 502 | // UTF-16; transcoding may introduce Unicode replacement characters |
| 503 | // U+FFFD if s does not contain valid UTF-8. |
| 504 | func javaStringHash(s string) (h int32) { |
| 505 | for _, r := range s { |
| 506 | if utf16.IsSurrogate(r) { |
| 507 | c1, c2 := utf16.EncodeRune(r) |
| 508 | h = 31*h + c1 |
| 509 | h = 31*h + c2 |
| 510 | } else { |
| 511 | h = 31*h + r // r may be U+FFFD |
| 512 | } |
| 513 | } |
| 514 | return h |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 515 | } |
| 516 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 517 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#int |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 518 | func int_(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 519 | var x Value = zero |
| 520 | var base Value |
alandonovan | 9413ca2 | 2018-03-19 13:46:37 -0400 | [diff] [blame] | 521 | if err := UnpackArgs("int", args, kwargs, "x", &x, "base?", &base); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 522 | return nil, err |
| 523 | } |
| 524 | |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 525 | if s, ok := AsString(x); ok { |
| 526 | b := 10 |
| 527 | if base != nil { |
| 528 | var err error |
| 529 | b, err = AsInt32(base) |
alandonovan | 28488fa | 2021-01-25 14:35:08 -0500 | [diff] [blame] | 530 | if err != nil { |
| 531 | return nil, fmt.Errorf("int: for base, got %s, want int", base.Type()) |
| 532 | } |
| 533 | if b != 0 && (b < 2 || b > 36) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 534 | return nil, fmt.Errorf("int: base must be an integer >= 2 && <= 36") |
| 535 | } |
| 536 | } |
alandonovan | 28488fa | 2021-01-25 14:35:08 -0500 | [diff] [blame] | 537 | res := parseInt(s, b) |
| 538 | if res == nil { |
| 539 | return nil, fmt.Errorf("int: invalid literal with base %d: %s", b, s) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 540 | } |
alandonovan | 28488fa | 2021-01-25 14:35:08 -0500 | [diff] [blame] | 541 | return res, nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 542 | } |
| 543 | |
| 544 | if base != nil { |
| 545 | return nil, fmt.Errorf("int: can't convert non-string with explicit base") |
| 546 | } |
alandonovan | 05f260d | 2017-10-18 12:43:53 -0400 | [diff] [blame] | 547 | |
| 548 | if b, ok := x.(Bool); ok { |
| 549 | if b { |
| 550 | return one, nil |
| 551 | } else { |
| 552 | return zero, nil |
| 553 | } |
| 554 | } |
| 555 | |
| 556 | i, err := NumberToInt(x) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 557 | if err != nil { |
| 558 | return nil, fmt.Errorf("int: %s", err) |
| 559 | } |
| 560 | return i, nil |
| 561 | } |
| 562 | |
alandonovan | 28488fa | 2021-01-25 14:35:08 -0500 | [diff] [blame] | 563 | // parseInt defines the behavior of int(string, base=int). It returns nil on error. |
| 564 | func parseInt(s string, base int) Value { |
| 565 | // remove sign |
| 566 | var neg bool |
| 567 | if s != "" { |
| 568 | if s[0] == '+' { |
| 569 | s = s[1:] |
| 570 | } else if s[0] == '-' { |
| 571 | neg = true |
| 572 | s = s[1:] |
| 573 | } |
| 574 | } |
| 575 | |
| 576 | // remove optional base prefix |
| 577 | baseprefix := 0 |
| 578 | if len(s) > 1 && s[0] == '0' { |
| 579 | if len(s) > 2 { |
| 580 | switch s[1] { |
| 581 | case 'o', 'O': |
| 582 | baseprefix = 8 |
| 583 | case 'x', 'X': |
| 584 | baseprefix = 16 |
| 585 | case 'b', 'B': |
| 586 | baseprefix = 2 |
| 587 | } |
| 588 | } |
| 589 | if baseprefix != 0 { |
| 590 | // Remove the base prefix if it matches |
| 591 | // the explicit base, or if base=0. |
| 592 | if base == 0 || baseprefix == base { |
| 593 | base = baseprefix |
| 594 | s = s[2:] |
| 595 | } |
| 596 | } else { |
| 597 | // For automatic base detection, |
| 598 | // a string starting with zero |
| 599 | // must be all zeros. |
| 600 | // Thus we reject int("0755", 0). |
| 601 | if base == 0 { |
| 602 | for i := 1; i < len(s); i++ { |
| 603 | if s[i] != '0' { |
| 604 | return nil |
| 605 | } |
| 606 | } |
| 607 | return zero |
| 608 | } |
| 609 | } |
| 610 | } |
| 611 | if base == 0 { |
| 612 | base = 10 |
| 613 | } |
| 614 | |
| 615 | // we explicitly handled sign above. |
| 616 | // if a sign remains, it is invalid. |
| 617 | if s != "" && (s[0] == '-' || s[0] == '+') { |
| 618 | return nil |
| 619 | } |
| 620 | |
| 621 | // s has no sign or base prefix. |
| 622 | if i, ok := new(big.Int).SetString(s, base); ok { |
| 623 | res := MakeBigInt(i) |
| 624 | if neg { |
| 625 | res = zero.Sub(res) |
| 626 | } |
| 627 | return res |
| 628 | } |
| 629 | |
| 630 | return nil |
| 631 | } |
| 632 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 633 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#len |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 634 | func len_(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 635 | var x Value |
| 636 | if err := UnpackPositionalArgs("len", args, kwargs, 1, &x); err != nil { |
| 637 | return nil, err |
| 638 | } |
| 639 | len := Len(x) |
| 640 | if len < 0 { |
alandonovan | f223ef8 | 2019-03-12 16:06:40 -0400 | [diff] [blame] | 641 | return nil, fmt.Errorf("len: value of type %s has no len", x.Type()) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 642 | } |
| 643 | return MakeInt(len), nil |
| 644 | } |
| 645 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 646 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#list |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 647 | func list(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 648 | var iterable Iterable |
| 649 | if err := UnpackPositionalArgs("list", args, kwargs, 0, &iterable); err != nil { |
| 650 | return nil, err |
| 651 | } |
| 652 | var elems []Value |
| 653 | if iterable != nil { |
| 654 | iter := iterable.Iterate() |
| 655 | defer iter.Done() |
| 656 | if n := Len(iterable); n > 0 { |
| 657 | elems = make([]Value, 0, n) // preallocate if length known |
| 658 | } |
| 659 | var x Value |
| 660 | for iter.Next(&x) { |
| 661 | elems = append(elems, x) |
| 662 | } |
| 663 | } |
| 664 | return NewList(elems), nil |
| 665 | } |
| 666 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 667 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#min |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 668 | func minmax(thread *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 669 | if len(args) == 0 { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 670 | return nil, fmt.Errorf("%s requires at least one positional argument", b.Name()) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 671 | } |
| 672 | var keyFunc Callable |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 673 | if err := UnpackArgs(b.Name(), nil, kwargs, "key?", &keyFunc); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 674 | return nil, err |
| 675 | } |
| 676 | var op syntax.Token |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 677 | if b.Name() == "max" { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 678 | op = syntax.GT |
| 679 | } else { |
| 680 | op = syntax.LT |
| 681 | } |
| 682 | var iterable Value |
| 683 | if len(args) == 1 { |
| 684 | iterable = args[0] |
| 685 | } else { |
| 686 | iterable = args |
| 687 | } |
| 688 | iter := Iterate(iterable) |
| 689 | if iter == nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 690 | return nil, fmt.Errorf("%s: %s value is not iterable", b.Name(), iterable.Type()) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 691 | } |
| 692 | defer iter.Done() |
| 693 | var extremum Value |
| 694 | if !iter.Next(&extremum) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 695 | return nil, nameErr(b, "argument is an empty sequence") |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 696 | } |
| 697 | |
| 698 | var extremeKey Value |
| 699 | var keyargs Tuple |
| 700 | if keyFunc == nil { |
| 701 | extremeKey = extremum |
| 702 | } else { |
| 703 | keyargs = Tuple{extremum} |
| 704 | res, err := Call(thread, keyFunc, keyargs, nil) |
| 705 | if err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 706 | return nil, err // to preserve backtrace, don't modify error |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 707 | } |
| 708 | extremeKey = res |
| 709 | } |
| 710 | |
| 711 | var x Value |
| 712 | for iter.Next(&x) { |
| 713 | var key Value |
| 714 | if keyFunc == nil { |
| 715 | key = x |
| 716 | } else { |
| 717 | keyargs[0] = x |
| 718 | res, err := Call(thread, keyFunc, keyargs, nil) |
| 719 | if err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 720 | return nil, err // to preserve backtrace, don't modify error |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 721 | } |
| 722 | key = res |
| 723 | } |
| 724 | |
| 725 | if ok, err := Compare(op, key, extremeKey); err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 726 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 727 | } else if ok { |
| 728 | extremum = x |
| 729 | extremeKey = key |
| 730 | } |
| 731 | } |
| 732 | return extremum, nil |
| 733 | } |
| 734 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 735 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#ord |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 736 | func ord(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 737 | if len(kwargs) > 0 { |
| 738 | return nil, fmt.Errorf("ord does not accept keyword arguments") |
| 739 | } |
| 740 | if len(args) != 1 { |
| 741 | return nil, fmt.Errorf("ord: got %d arguments, want 1", len(args)) |
| 742 | } |
alandonovan | ebe61bd | 2021-02-12 16:57:32 -0500 | [diff] [blame] | 743 | switch x := args[0].(type) { |
| 744 | case String: |
| 745 | // ord(string) returns int value of sole rune. |
| 746 | s := string(x) |
| 747 | r, sz := utf8.DecodeRuneInString(s) |
| 748 | if sz == 0 || sz != len(s) { |
| 749 | n := utf8.RuneCountInString(s) |
| 750 | return nil, fmt.Errorf("ord: string encodes %d Unicode code points, want 1", n) |
| 751 | } |
| 752 | return MakeInt(int(r)), nil |
| 753 | |
| 754 | case Bytes: |
| 755 | // ord(bytes) returns int value of sole byte. |
| 756 | if len(x) != 1 { |
| 757 | return nil, fmt.Errorf("ord: bytes has length %d, want 1", len(x)) |
| 758 | } |
| 759 | return MakeInt(int(x[0])), nil |
| 760 | default: |
| 761 | return nil, fmt.Errorf("ord: got %s, want string or bytes", x.Type()) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 762 | } |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 763 | } |
| 764 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 765 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#print |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 766 | func print(thread *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 88085a4 | 2018-12-14 19:09:49 -0500 | [diff] [blame] | 767 | sep := " " |
| 768 | if err := UnpackArgs("print", nil, kwargs, "sep?", &sep); err != nil { |
| 769 | return nil, err |
| 770 | } |
Josh Bleecher Snyder | 8cb25c8 | 2019-03-01 14:24:35 -0800 | [diff] [blame] | 771 | buf := new(strings.Builder) |
alandonovan | 88085a4 | 2018-12-14 19:09:49 -0500 | [diff] [blame] | 772 | for i, v := range args { |
| 773 | if i > 0 { |
| 774 | buf.WriteString(sep) |
| 775 | } |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 776 | if s, ok := AsString(v); ok { |
| 777 | buf.WriteString(s) |
alandonovan | ebe61bd | 2021-02-12 16:57:32 -0500 | [diff] [blame] | 778 | } else if b, ok := v.(Bytes); ok { |
| 779 | buf.WriteString(string(b)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 780 | } else { |
Josh Bleecher Snyder | 8cb25c8 | 2019-03-01 14:24:35 -0800 | [diff] [blame] | 781 | writeValue(buf, v, nil) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 782 | } |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 783 | } |
| 784 | |
Josh Bleecher Snyder | 8cb25c8 | 2019-03-01 14:24:35 -0800 | [diff] [blame] | 785 | s := buf.String() |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 786 | if thread.Print != nil { |
Josh Bleecher Snyder | 8cb25c8 | 2019-03-01 14:24:35 -0800 | [diff] [blame] | 787 | thread.Print(thread, s) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 788 | } else { |
Josh Bleecher Snyder | 8cb25c8 | 2019-03-01 14:24:35 -0800 | [diff] [blame] | 789 | fmt.Fprintln(os.Stderr, s) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 790 | } |
| 791 | return None, nil |
| 792 | } |
| 793 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 794 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#range |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 795 | func range_(thread *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 796 | var start, stop, step int |
| 797 | step = 1 |
| 798 | if err := UnpackPositionalArgs("range", args, kwargs, 1, &start, &stop, &step); err != nil { |
| 799 | return nil, err |
| 800 | } |
alandonovan | 05f260d | 2017-10-18 12:43:53 -0400 | [diff] [blame] | 801 | |
Josh Bleecher Snyder | d5c553a | 2019-01-16 12:51:06 -0800 | [diff] [blame] | 802 | if len(args) == 1 { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 803 | // range(stop) |
| 804 | start, stop = 0, start |
Josh Bleecher Snyder | d5c553a | 2019-01-16 12:51:06 -0800 | [diff] [blame] | 805 | } |
| 806 | if step == 0 { |
| 807 | // we were given range(start, stop, 0) |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 808 | return nil, nameErr(b, "step argument must not be zero") |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 809 | } |
alandonovan | 05f260d | 2017-10-18 12:43:53 -0400 | [diff] [blame] | 810 | |
Josh Bleecher Snyder | d5c553a | 2019-01-16 12:51:06 -0800 | [diff] [blame] | 811 | return rangeValue{start: start, stop: stop, step: step, len: rangeLen(start, stop, step)}, nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 812 | } |
| 813 | |
alandonovan | 05f260d | 2017-10-18 12:43:53 -0400 | [diff] [blame] | 814 | // A rangeValue is a comparable, immutable, indexable sequence of integers |
| 815 | // defined by the three parameters to a range(...) call. |
| 816 | // Invariant: step != 0. |
| 817 | type rangeValue struct{ start, stop, step, len int } |
| 818 | |
| 819 | var ( |
| 820 | _ Indexable = rangeValue{} |
| 821 | _ Sequence = rangeValue{} |
| 822 | _ Comparable = rangeValue{} |
Nick Santos | d3cd736 | 2018-05-18 12:58:53 -0400 | [diff] [blame] | 823 | _ Sliceable = rangeValue{} |
alandonovan | 05f260d | 2017-10-18 12:43:53 -0400 | [diff] [blame] | 824 | ) |
| 825 | |
| 826 | func (r rangeValue) Len() int { return r.len } |
| 827 | func (r rangeValue) Index(i int) Value { return MakeInt(r.start + i*r.step) } |
| 828 | func (r rangeValue) Iterate() Iterator { return &rangeIterator{r, 0} } |
Nick Santos | d3cd736 | 2018-05-18 12:58:53 -0400 | [diff] [blame] | 829 | |
Josh Bleecher Snyder | d5c553a | 2019-01-16 12:51:06 -0800 | [diff] [blame] | 830 | // rangeLen calculates the length of a range with the provided start, stop, and step. |
| 831 | // caller must ensure that step is non-zero. |
| 832 | func rangeLen(start, stop, step int) int { |
| 833 | switch { |
| 834 | case step > 0: |
| 835 | if stop > start { |
| 836 | return (stop-1-start)/step + 1 |
| 837 | } |
| 838 | case step < 0: |
| 839 | if start > stop { |
| 840 | return (start-1-stop)/-step + 1 |
| 841 | } |
| 842 | default: |
| 843 | panic("rangeLen: zero step") |
| 844 | } |
| 845 | return 0 |
| 846 | } |
| 847 | |
Nick Santos | d3cd736 | 2018-05-18 12:58:53 -0400 | [diff] [blame] | 848 | func (r rangeValue) Slice(start, end, step int) Value { |
| 849 | newStart := r.start + r.step*start |
| 850 | newStop := r.start + r.step*end |
| 851 | newStep := r.step * step |
Nick Santos | d3cd736 | 2018-05-18 12:58:53 -0400 | [diff] [blame] | 852 | return rangeValue{ |
| 853 | start: newStart, |
| 854 | stop: newStop, |
| 855 | step: newStep, |
Josh Bleecher Snyder | d5c553a | 2019-01-16 12:51:06 -0800 | [diff] [blame] | 856 | len: rangeLen(newStart, newStop, newStep), |
Nick Santos | d3cd736 | 2018-05-18 12:58:53 -0400 | [diff] [blame] | 857 | } |
| 858 | } |
| 859 | |
| 860 | func (r rangeValue) Freeze() {} // immutable |
alandonovan | 05f260d | 2017-10-18 12:43:53 -0400 | [diff] [blame] | 861 | func (r rangeValue) String() string { |
| 862 | if r.step != 1 { |
| 863 | return fmt.Sprintf("range(%d, %d, %d)", r.start, r.stop, r.step) |
| 864 | } else if r.start != 0 { |
| 865 | return fmt.Sprintf("range(%d, %d)", r.start, r.stop) |
| 866 | } else { |
| 867 | return fmt.Sprintf("range(%d)", r.stop) |
| 868 | } |
| 869 | } |
| 870 | func (r rangeValue) Type() string { return "range" } |
| 871 | func (r rangeValue) Truth() Bool { return r.len > 0 } |
| 872 | func (r rangeValue) Hash() (uint32, error) { return 0, fmt.Errorf("unhashable: range") } |
| 873 | |
| 874 | func (x rangeValue) CompareSameType(op syntax.Token, y_ Value, depth int) (bool, error) { |
| 875 | y := y_.(rangeValue) |
| 876 | switch op { |
| 877 | case syntax.EQL: |
| 878 | return rangeEqual(x, y), nil |
| 879 | case syntax.NEQ: |
| 880 | return !rangeEqual(x, y), nil |
| 881 | default: |
| 882 | return false, fmt.Errorf("%s %s %s not implemented", x.Type(), op, y.Type()) |
| 883 | } |
| 884 | } |
| 885 | |
| 886 | func rangeEqual(x, y rangeValue) bool { |
| 887 | // Two ranges compare equal if they denote the same sequence. |
alandonovan | 59a38fd | 2018-11-02 11:35:39 -0400 | [diff] [blame] | 888 | if x.len != y.len { |
| 889 | return false // sequences differ in length |
| 890 | } |
| 891 | if x.len == 0 { |
| 892 | return true // both sequences are empty |
| 893 | } |
| 894 | if x.start != y.start { |
| 895 | return false // first element differs |
| 896 | } |
| 897 | return x.len == 1 || x.step == y.step |
alandonovan | 05f260d | 2017-10-18 12:43:53 -0400 | [diff] [blame] | 898 | } |
| 899 | |
| 900 | func (r rangeValue) contains(x Int) bool { |
| 901 | x32, err := AsInt32(x) |
| 902 | if err != nil { |
| 903 | return false // out of range |
| 904 | } |
| 905 | delta := x32 - r.start |
| 906 | quo, rem := delta/r.step, delta%r.step |
| 907 | return rem == 0 && 0 <= quo && quo < r.len |
| 908 | } |
| 909 | |
| 910 | type rangeIterator struct { |
| 911 | r rangeValue |
| 912 | i int |
| 913 | } |
| 914 | |
| 915 | func (it *rangeIterator) Next(p *Value) bool { |
| 916 | if it.i < it.r.len { |
| 917 | *p = it.r.Index(it.i) |
| 918 | it.i++ |
| 919 | return true |
| 920 | } |
| 921 | return false |
| 922 | } |
| 923 | func (*rangeIterator) Done() {} |
| 924 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 925 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#repr |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 926 | func repr(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 927 | var x Value |
| 928 | if err := UnpackPositionalArgs("repr", args, kwargs, 1, &x); err != nil { |
| 929 | return nil, err |
| 930 | } |
| 931 | return String(x.String()), nil |
| 932 | } |
| 933 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 934 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#reversed |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 935 | func reversed(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 936 | var iterable Iterable |
| 937 | if err := UnpackPositionalArgs("reversed", args, kwargs, 1, &iterable); err != nil { |
| 938 | return nil, err |
| 939 | } |
| 940 | iter := iterable.Iterate() |
| 941 | defer iter.Done() |
| 942 | var elems []Value |
| 943 | if n := Len(args[0]); n >= 0 { |
| 944 | elems = make([]Value, 0, n) // preallocate if length known |
| 945 | } |
| 946 | var x Value |
| 947 | for iter.Next(&x) { |
| 948 | elems = append(elems, x) |
| 949 | } |
| 950 | n := len(elems) |
| 951 | for i := 0; i < n>>1; i++ { |
| 952 | elems[i], elems[n-1-i] = elems[n-1-i], elems[i] |
| 953 | } |
| 954 | return NewList(elems), nil |
| 955 | } |
| 956 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 957 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#set |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 958 | func set(thread *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 959 | var iterable Iterable |
| 960 | if err := UnpackPositionalArgs("set", args, kwargs, 0, &iterable); err != nil { |
| 961 | return nil, err |
| 962 | } |
| 963 | set := new(Set) |
| 964 | if iterable != nil { |
| 965 | iter := iterable.Iterate() |
| 966 | defer iter.Done() |
| 967 | var x Value |
| 968 | for iter.Next(&x) { |
| 969 | if err := set.Insert(x); err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 970 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 971 | } |
| 972 | } |
| 973 | } |
| 974 | return set, nil |
| 975 | } |
| 976 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 977 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#sorted |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 978 | func sorted(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | daf30b6 | 2019-05-03 16:35:58 -0400 | [diff] [blame] | 979 | // Oddly, Python's sorted permits all arguments to be positional, thus so do we. |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 980 | var iterable Iterable |
alandonovan | 23d0c96 | 2017-10-18 14:09:28 -0400 | [diff] [blame] | 981 | var key Callable |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 982 | var reverse bool |
| 983 | if err := UnpackArgs("sorted", args, kwargs, |
| 984 | "iterable", &iterable, |
alandonovan | 23d0c96 | 2017-10-18 14:09:28 -0400 | [diff] [blame] | 985 | "key?", &key, |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 986 | "reverse?", &reverse, |
| 987 | ); err != nil { |
| 988 | return nil, err |
| 989 | } |
| 990 | |
| 991 | iter := iterable.Iterate() |
| 992 | defer iter.Done() |
alandonovan | 23d0c96 | 2017-10-18 14:09:28 -0400 | [diff] [blame] | 993 | var values []Value |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 994 | if n := Len(iterable); n > 0 { |
alandonovan | 23d0c96 | 2017-10-18 14:09:28 -0400 | [diff] [blame] | 995 | values = make(Tuple, 0, n) // preallocate if length is known |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 996 | } |
| 997 | var x Value |
| 998 | for iter.Next(&x) { |
alandonovan | 23d0c96 | 2017-10-18 14:09:28 -0400 | [diff] [blame] | 999 | values = append(values, x) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1000 | } |
alandonovan | 23d0c96 | 2017-10-18 14:09:28 -0400 | [diff] [blame] | 1001 | |
| 1002 | // Derive keys from values by applying key function. |
| 1003 | var keys []Value |
| 1004 | if key != nil { |
| 1005 | keys = make([]Value, len(values)) |
| 1006 | for i, v := range values { |
| 1007 | k, err := Call(thread, key, Tuple{v}, nil) |
| 1008 | if err != nil { |
| 1009 | return nil, err // to preserve backtrace, don't modify error |
| 1010 | } |
| 1011 | keys[i] = k |
| 1012 | } |
| 1013 | } |
| 1014 | |
| 1015 | slice := &sortSlice{keys: keys, values: values} |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1016 | if reverse { |
alandonovan | 23d0c96 | 2017-10-18 14:09:28 -0400 | [diff] [blame] | 1017 | sort.Stable(sort.Reverse(slice)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1018 | } else { |
alandonovan | 23d0c96 | 2017-10-18 14:09:28 -0400 | [diff] [blame] | 1019 | sort.Stable(slice) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1020 | } |
alandonovan | 23d0c96 | 2017-10-18 14:09:28 -0400 | [diff] [blame] | 1021 | return NewList(slice.values), slice.err |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1022 | } |
| 1023 | |
| 1024 | type sortSlice struct { |
alandonovan | 23d0c96 | 2017-10-18 14:09:28 -0400 | [diff] [blame] | 1025 | keys []Value // nil => values[i] is key |
| 1026 | values []Value |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1027 | err error |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1028 | } |
| 1029 | |
alandonovan | 23d0c96 | 2017-10-18 14:09:28 -0400 | [diff] [blame] | 1030 | func (s *sortSlice) Len() int { return len(s.values) } |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1031 | func (s *sortSlice) Less(i, j int) bool { |
alandonovan | 23d0c96 | 2017-10-18 14:09:28 -0400 | [diff] [blame] | 1032 | keys := s.keys |
| 1033 | if s.keys == nil { |
| 1034 | keys = s.values |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1035 | } |
alandonovan | 23d0c96 | 2017-10-18 14:09:28 -0400 | [diff] [blame] | 1036 | ok, err := Compare(syntax.LT, keys[i], keys[j]) |
Diego Siqueira | 6cae335 | 2017-10-08 01:16:14 +0200 | [diff] [blame] | 1037 | if err != nil { |
| 1038 | s.err = err |
| 1039 | } |
| 1040 | return ok |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1041 | } |
| 1042 | func (s *sortSlice) Swap(i, j int) { |
alandonovan | 23d0c96 | 2017-10-18 14:09:28 -0400 | [diff] [blame] | 1043 | if s.keys != nil { |
| 1044 | s.keys[i], s.keys[j] = s.keys[j], s.keys[i] |
| 1045 | } |
| 1046 | s.values[i], s.values[j] = s.values[j], s.values[i] |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1047 | } |
| 1048 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1049 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#str |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1050 | func str(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 1051 | if len(kwargs) > 0 { |
| 1052 | return nil, fmt.Errorf("str does not accept keyword arguments") |
| 1053 | } |
| 1054 | if len(args) != 1 { |
| 1055 | return nil, fmt.Errorf("str: got %d arguments, want exactly 1", len(args)) |
| 1056 | } |
alandonovan | ebe61bd | 2021-02-12 16:57:32 -0500 | [diff] [blame] | 1057 | switch x := args[0].(type) { |
| 1058 | case String: |
| 1059 | return x, nil |
| 1060 | case Bytes: |
| 1061 | // Invalid encodings are replaced by that of U+FFFD. |
| 1062 | return String(utf8Transcode(string(x))), nil |
| 1063 | default: |
| 1064 | return String(x.String()), nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1065 | } |
alandonovan | ebe61bd | 2021-02-12 16:57:32 -0500 | [diff] [blame] | 1066 | } |
| 1067 | |
| 1068 | // utf8Transcode returns the UTF-8-to-UTF-8 transcoding of s. |
| 1069 | // The effect is that each code unit that is part of an |
| 1070 | // invalid sequence is replaced by U+FFFD. |
| 1071 | func utf8Transcode(s string) string { |
| 1072 | if utf8.ValidString(s) { |
| 1073 | return s |
| 1074 | } |
| 1075 | var out strings.Builder |
| 1076 | for _, r := range s { |
| 1077 | out.WriteRune(r) |
| 1078 | } |
| 1079 | return out.String() |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1080 | } |
| 1081 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1082 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#tuple |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1083 | func tuple(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 1084 | var iterable Iterable |
| 1085 | if err := UnpackPositionalArgs("tuple", args, kwargs, 0, &iterable); err != nil { |
| 1086 | return nil, err |
| 1087 | } |
| 1088 | if len(args) == 0 { |
| 1089 | return Tuple(nil), nil |
| 1090 | } |
| 1091 | iter := iterable.Iterate() |
| 1092 | defer iter.Done() |
| 1093 | var elems Tuple |
| 1094 | if n := Len(iterable); n > 0 { |
| 1095 | elems = make(Tuple, 0, n) // preallocate if length is known |
| 1096 | } |
| 1097 | var x Value |
| 1098 | for iter.Next(&x) { |
| 1099 | elems = append(elems, x) |
| 1100 | } |
| 1101 | return elems, nil |
| 1102 | } |
| 1103 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1104 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#type |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1105 | func type_(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 1106 | if len(kwargs) > 0 { |
| 1107 | return nil, fmt.Errorf("type does not accept keyword arguments") |
| 1108 | } |
| 1109 | if len(args) != 1 { |
| 1110 | return nil, fmt.Errorf("type: got %d arguments, want exactly 1", len(args)) |
| 1111 | } |
| 1112 | return String(args[0].Type()), nil |
| 1113 | } |
| 1114 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1115 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#zip |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1116 | func zip(thread *Thread, _ *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 1117 | if len(kwargs) > 0 { |
| 1118 | return nil, fmt.Errorf("zip does not accept keyword arguments") |
| 1119 | } |
| 1120 | rows, cols := 0, len(args) |
| 1121 | iters := make([]Iterator, cols) |
kostya-sh | 25a152d | 2017-10-17 16:25:27 +0100 | [diff] [blame] | 1122 | defer func() { |
| 1123 | for _, iter := range iters { |
| 1124 | if iter != nil { |
| 1125 | iter.Done() |
| 1126 | } |
| 1127 | } |
| 1128 | }() |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1129 | for i, seq := range args { |
| 1130 | it := Iterate(seq) |
| 1131 | if it == nil { |
| 1132 | return nil, fmt.Errorf("zip: argument #%d is not iterable: %s", i+1, seq.Type()) |
| 1133 | } |
| 1134 | iters[i] = it |
| 1135 | n := Len(seq) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1136 | if i == 0 || n < rows { |
kostya-sh | 5cb1ab5 | 2017-10-18 19:41:49 +0100 | [diff] [blame] | 1137 | rows = n // possibly -1 |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1138 | } |
| 1139 | } |
kostya-sh | 5cb1ab5 | 2017-10-18 19:41:49 +0100 | [diff] [blame] | 1140 | var result []Value |
| 1141 | if rows >= 0 { |
| 1142 | // length known |
| 1143 | result = make([]Value, rows) |
| 1144 | array := make(Tuple, cols*rows) // allocate a single backing array |
| 1145 | for i := 0; i < rows; i++ { |
| 1146 | tuple := array[:cols:cols] |
| 1147 | array = array[cols:] |
| 1148 | for j, iter := range iters { |
| 1149 | iter.Next(&tuple[j]) |
| 1150 | } |
| 1151 | result[i] = tuple |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1152 | } |
kostya-sh | 5cb1ab5 | 2017-10-18 19:41:49 +0100 | [diff] [blame] | 1153 | } else { |
| 1154 | // length not known |
| 1155 | outer: |
| 1156 | for { |
| 1157 | tuple := make(Tuple, cols) |
| 1158 | for i, iter := range iters { |
| 1159 | if !iter.Next(&tuple[i]) { |
| 1160 | break outer |
| 1161 | } |
| 1162 | } |
| 1163 | result = append(result, tuple) |
| 1164 | } |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1165 | } |
| 1166 | return NewList(result), nil |
| 1167 | } |
| 1168 | |
| 1169 | // ---- methods of built-in types --- |
| 1170 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1171 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#dict·get |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1172 | func dict_get(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1173 | var key, dflt Value |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1174 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 1, &key, &dflt); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1175 | return nil, err |
| 1176 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1177 | if v, ok, err := b.Receiver().(*Dict).Get(key); err != nil { |
| 1178 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1179 | } else if ok { |
| 1180 | return v, nil |
| 1181 | } else if dflt != nil { |
| 1182 | return dflt, nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1183 | } |
Diego Siqueira | 6cae335 | 2017-10-08 01:16:14 +0200 | [diff] [blame] | 1184 | return None, nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1185 | } |
| 1186 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1187 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#dict·clear |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1188 | func dict_clear(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1189 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1190 | return nil, err |
| 1191 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1192 | return None, b.Receiver().(*Dict).Clear() |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1193 | } |
| 1194 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1195 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#dict·items |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1196 | func dict_items(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1197 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1198 | return nil, err |
| 1199 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1200 | items := b.Receiver().(*Dict).Items() |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1201 | res := make([]Value, len(items)) |
| 1202 | for i, item := range items { |
| 1203 | res[i] = item // convert [2]Value to Value |
| 1204 | } |
| 1205 | return NewList(res), nil |
| 1206 | } |
| 1207 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1208 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#dict·keys |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1209 | func dict_keys(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1210 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1211 | return nil, err |
| 1212 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1213 | return NewList(b.Receiver().(*Dict).Keys()), nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1214 | } |
| 1215 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1216 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#dict·pop |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1217 | func dict_pop(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1218 | var k, d Value |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1219 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 1, &k, &d); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1220 | return nil, err |
| 1221 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1222 | if v, found, err := b.Receiver().(*Dict).Delete(k); err != nil { |
| 1223 | return nil, nameErr(b, err) // dict is frozen or key is unhashable |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1224 | } else if found { |
| 1225 | return v, nil |
| 1226 | } else if d != nil { |
| 1227 | return d, nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1228 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1229 | return nil, nameErr(b, "missing key") |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1230 | } |
| 1231 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1232 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#dict·popitem |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1233 | func dict_popitem(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1234 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1235 | return nil, err |
| 1236 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1237 | recv := b.Receiver().(*Dict) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1238 | k, ok := recv.ht.first() |
| 1239 | if !ok { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1240 | return nil, nameErr(b, "empty dict") |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1241 | } |
| 1242 | v, _, err := recv.Delete(k) |
| 1243 | if err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1244 | return nil, nameErr(b, err) // dict is frozen |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1245 | } |
| 1246 | return Tuple{k, v}, nil |
| 1247 | } |
| 1248 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1249 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#dict·setdefault |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1250 | func dict_setdefault(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1251 | var key, dflt Value = nil, None |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1252 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 1, &key, &dflt); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1253 | return nil, err |
| 1254 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1255 | dict := b.Receiver().(*Dict) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1256 | if v, ok, err := dict.Get(key); err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1257 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1258 | } else if ok { |
| 1259 | return v, nil |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1260 | } else if err := dict.SetKey(key, dflt); err != nil { |
| 1261 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1262 | } else { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1263 | return dflt, nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1264 | } |
| 1265 | } |
| 1266 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1267 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#dict·update |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1268 | func dict_update(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1269 | if len(args) > 1 { |
| 1270 | return nil, fmt.Errorf("update: got %d arguments, want at most 1", len(args)) |
| 1271 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1272 | if err := updateDict(b.Receiver().(*Dict), args, kwargs); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1273 | return nil, fmt.Errorf("update: %v", err) |
| 1274 | } |
| 1275 | return None, nil |
| 1276 | } |
| 1277 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1278 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#dict·update |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1279 | func dict_values(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1280 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1281 | return nil, err |
| 1282 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1283 | items := b.Receiver().(*Dict).Items() |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1284 | res := make([]Value, len(items)) |
| 1285 | for i, item := range items { |
| 1286 | res[i] = item[1] |
| 1287 | } |
| 1288 | return NewList(res), nil |
| 1289 | } |
| 1290 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1291 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#list·append |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1292 | func list_append(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1293 | var object Value |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1294 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 1, &object); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1295 | return nil, err |
| 1296 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1297 | recv := b.Receiver().(*List) |
alandonovan | 7c0e5a3 | 2018-11-02 15:38:05 -0400 | [diff] [blame] | 1298 | if err := recv.checkMutable("append to"); err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1299 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1300 | } |
| 1301 | recv.elems = append(recv.elems, object) |
| 1302 | return None, nil |
| 1303 | } |
| 1304 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1305 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#list·clear |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1306 | func list_clear(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1307 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1308 | return nil, err |
| 1309 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1310 | if err := b.Receiver().(*List).Clear(); err != nil { |
| 1311 | return nil, nameErr(b, err) |
| 1312 | } |
| 1313 | return None, nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1314 | } |
| 1315 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1316 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#list·extend |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1317 | func list_extend(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1318 | recv := b.Receiver().(*List) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1319 | var iterable Iterable |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1320 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 1, &iterable); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1321 | return nil, err |
| 1322 | } |
alandonovan | 7c0e5a3 | 2018-11-02 15:38:05 -0400 | [diff] [blame] | 1323 | if err := recv.checkMutable("extend"); err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1324 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1325 | } |
| 1326 | listExtend(recv, iterable) |
| 1327 | return None, nil |
| 1328 | } |
| 1329 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1330 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#list·index |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1331 | func list_index(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1332 | var value, start_, end_ Value |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1333 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 1, &value, &start_, &end_); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1334 | return nil, err |
| 1335 | } |
| 1336 | |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1337 | recv := b.Receiver().(*List) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1338 | start, end, err := indices(start_, end_, recv.Len()) |
| 1339 | if err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1340 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1341 | } |
| 1342 | |
| 1343 | for i := start; i < end; i++ { |
| 1344 | if eq, err := Equal(recv.elems[i], value); err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1345 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1346 | } else if eq { |
| 1347 | return MakeInt(i), nil |
| 1348 | } |
| 1349 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1350 | return nil, nameErr(b, "value not in list") |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1351 | } |
| 1352 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1353 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#list·insert |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1354 | func list_insert(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1355 | recv := b.Receiver().(*List) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1356 | var index int |
| 1357 | var object Value |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1358 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 2, &index, &object); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1359 | return nil, err |
| 1360 | } |
alandonovan | 7c0e5a3 | 2018-11-02 15:38:05 -0400 | [diff] [blame] | 1361 | if err := recv.checkMutable("insert into"); err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1362 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1363 | } |
| 1364 | |
| 1365 | if index < 0 { |
| 1366 | index += recv.Len() |
| 1367 | } |
| 1368 | |
| 1369 | if index >= recv.Len() { |
| 1370 | // end |
| 1371 | recv.elems = append(recv.elems, object) |
| 1372 | } else { |
| 1373 | if index < 0 { |
| 1374 | index = 0 // start |
| 1375 | } |
| 1376 | recv.elems = append(recv.elems, nil) |
| 1377 | copy(recv.elems[index+1:], recv.elems[index:]) // slide up one |
| 1378 | recv.elems[index] = object |
| 1379 | } |
| 1380 | return None, nil |
| 1381 | } |
| 1382 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1383 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#list·remove |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1384 | func list_remove(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1385 | recv := b.Receiver().(*List) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1386 | var value Value |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1387 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 1, &value); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1388 | return nil, err |
| 1389 | } |
alandonovan | 7c0e5a3 | 2018-11-02 15:38:05 -0400 | [diff] [blame] | 1390 | if err := recv.checkMutable("remove from"); err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1391 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1392 | } |
| 1393 | for i, elem := range recv.elems { |
| 1394 | if eq, err := Equal(elem, value); err != nil { |
| 1395 | return nil, fmt.Errorf("remove: %v", err) |
| 1396 | } else if eq { |
| 1397 | recv.elems = append(recv.elems[:i], recv.elems[i+1:]...) |
| 1398 | return None, nil |
| 1399 | } |
| 1400 | } |
| 1401 | return nil, fmt.Errorf("remove: element not found") |
| 1402 | } |
| 1403 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1404 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#list·pop |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1405 | func list_pop(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1406 | recv := b.Receiver() |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1407 | list := recv.(*List) |
alandonovan | e560c9b | 2019-01-23 19:08:06 -0500 | [diff] [blame] | 1408 | n := list.Len() |
| 1409 | i := n - 1 |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1410 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0, &i); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1411 | return nil, err |
| 1412 | } |
alandonovan | e560c9b | 2019-01-23 19:08:06 -0500 | [diff] [blame] | 1413 | origI := i |
| 1414 | if i < 0 { |
| 1415 | i += n |
| 1416 | } |
| 1417 | if i < 0 || i >= n { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1418 | return nil, nameErr(b, outOfRange(origI, n, list)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1419 | } |
alandonovan | 7c0e5a3 | 2018-11-02 15:38:05 -0400 | [diff] [blame] | 1420 | if err := list.checkMutable("pop from"); err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1421 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1422 | } |
alandonovan | e560c9b | 2019-01-23 19:08:06 -0500 | [diff] [blame] | 1423 | res := list.elems[i] |
| 1424 | list.elems = append(list.elems[:i], list.elems[i+1:]...) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1425 | return res, nil |
| 1426 | } |
| 1427 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1428 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·capitalize |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1429 | func string_capitalize(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1430 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1431 | return nil, err |
| 1432 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1433 | s := string(b.Receiver().(String)) |
Josh Bleecher Snyder | 8cb25c8 | 2019-03-01 14:24:35 -0800 | [diff] [blame] | 1434 | res := new(strings.Builder) |
alandonovan | 4c43ff3 | 2018-11-02 14:50:48 -0400 | [diff] [blame] | 1435 | res.Grow(len(s)) |
| 1436 | for i, r := range s { |
| 1437 | if i == 0 { |
| 1438 | r = unicode.ToTitle(r) |
| 1439 | } else { |
| 1440 | r = unicode.ToLower(r) |
| 1441 | } |
| 1442 | res.WriteRune(r) |
| 1443 | } |
| 1444 | return String(res.String()), nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1445 | } |
| 1446 | |
| 1447 | // string_iterable returns an unspecified iterable value whose iterator yields: |
alandonovan | 0569d1c | 2018-03-29 14:47:42 -0400 | [diff] [blame] | 1448 | // - elems: successive 1-byte substrings |
| 1449 | // - codepoints: successive substrings that encode a single Unicode code point. |
| 1450 | // - elem_ords: numeric values of successive bytes |
| 1451 | // - codepoint_ords: numeric values of successive Unicode code points |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1452 | func string_iterable(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1453 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1454 | return nil, err |
| 1455 | } |
alandonovan | ebe61bd | 2021-02-12 16:57:32 -0500 | [diff] [blame] | 1456 | s := b.Receiver().(String) |
| 1457 | ords := b.Name()[len(b.Name())-2] == 'd' |
| 1458 | codepoints := b.Name()[0] == 'c' |
| 1459 | if codepoints { |
| 1460 | return stringCodepoints{s, ords}, nil |
| 1461 | } else { |
| 1462 | return stringElems{s, ords}, nil |
| 1463 | } |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1464 | } |
| 1465 | |
alandonovan | ebe61bd | 2021-02-12 16:57:32 -0500 | [diff] [blame] | 1466 | // bytes_elems returns an unspecified iterable value whose |
| 1467 | // iterator yields the int values of successive elements. |
| 1468 | func bytes_elems(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
| 1469 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
| 1470 | return nil, err |
| 1471 | } |
| 1472 | return bytesIterable{b.Receiver().(Bytes)}, nil |
| 1473 | } |
| 1474 | |
| 1475 | // A bytesIterable is an iterable returned by bytes.elems(), |
| 1476 | // whose iterator yields a sequence of numeric bytes values. |
| 1477 | type bytesIterable struct{ bytes Bytes } |
| 1478 | |
| 1479 | var _ Iterable = (*bytesIterable)(nil) |
| 1480 | |
| 1481 | func (bi bytesIterable) String() string { return bi.bytes.String() + ".elems()" } |
| 1482 | func (bi bytesIterable) Type() string { return "bytes.elems" } |
| 1483 | func (bi bytesIterable) Freeze() {} // immutable |
| 1484 | func (bi bytesIterable) Truth() Bool { return True } |
| 1485 | func (bi bytesIterable) Hash() (uint32, error) { return 0, fmt.Errorf("unhashable: %s", bi.Type()) } |
| 1486 | func (bi bytesIterable) Iterate() Iterator { return &bytesIterator{bi.bytes} } |
| 1487 | |
| 1488 | type bytesIterator struct{ bytes Bytes } |
| 1489 | |
| 1490 | func (it *bytesIterator) Next(p *Value) bool { |
| 1491 | if it.bytes == "" { |
| 1492 | return false |
| 1493 | } |
| 1494 | *p = MakeInt(int(it.bytes[0])) |
| 1495 | it.bytes = it.bytes[1:] |
| 1496 | return true |
| 1497 | } |
| 1498 | |
| 1499 | func (*bytesIterator) Done() {} |
| 1500 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1501 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·count |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1502 | func string_count(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1503 | var sub string |
| 1504 | var start_, end_ Value |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1505 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 1, &sub, &start_, &end_); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1506 | return nil, err |
| 1507 | } |
| 1508 | |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1509 | recv := string(b.Receiver().(String)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1510 | start, end, err := indices(start_, end_, len(recv)) |
| 1511 | if err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1512 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1513 | } |
| 1514 | |
| 1515 | var slice string |
| 1516 | if start < end { |
| 1517 | slice = recv[start:end] |
| 1518 | } |
| 1519 | return MakeInt(strings.Count(slice, sub)), nil |
| 1520 | } |
| 1521 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1522 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·isalnum |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1523 | func string_isalnum(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1524 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1525 | return nil, err |
| 1526 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1527 | recv := string(b.Receiver().(String)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1528 | for _, r := range recv { |
| 1529 | if !unicode.IsLetter(r) && !unicode.IsDigit(r) { |
| 1530 | return False, nil |
| 1531 | } |
| 1532 | } |
| 1533 | return Bool(recv != ""), nil |
| 1534 | } |
| 1535 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1536 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·isalpha |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1537 | func string_isalpha(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1538 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1539 | return nil, err |
| 1540 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1541 | recv := string(b.Receiver().(String)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1542 | for _, r := range recv { |
| 1543 | if !unicode.IsLetter(r) { |
| 1544 | return False, nil |
| 1545 | } |
| 1546 | } |
| 1547 | return Bool(recv != ""), nil |
| 1548 | } |
| 1549 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1550 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·isdigit |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1551 | func string_isdigit(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1552 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1553 | return nil, err |
| 1554 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1555 | recv := string(b.Receiver().(String)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1556 | for _, r := range recv { |
| 1557 | if !unicode.IsDigit(r) { |
| 1558 | return False, nil |
| 1559 | } |
| 1560 | } |
| 1561 | return Bool(recv != ""), nil |
| 1562 | } |
| 1563 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1564 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·islower |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1565 | func string_islower(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1566 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1567 | return nil, err |
| 1568 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1569 | recv := string(b.Receiver().(String)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1570 | return Bool(isCasedString(recv) && recv == strings.ToLower(recv)), nil |
| 1571 | } |
| 1572 | |
alandonovan | 4c43ff3 | 2018-11-02 14:50:48 -0400 | [diff] [blame] | 1573 | // isCasedString reports whether its argument contains any cased code points. |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1574 | func isCasedString(s string) bool { |
| 1575 | for _, r := range s { |
alandonovan | 4c43ff3 | 2018-11-02 14:50:48 -0400 | [diff] [blame] | 1576 | if isCasedRune(r) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1577 | return true |
| 1578 | } |
| 1579 | } |
| 1580 | return false |
| 1581 | } |
| 1582 | |
alandonovan | 4c43ff3 | 2018-11-02 14:50:48 -0400 | [diff] [blame] | 1583 | func isCasedRune(r rune) bool { |
| 1584 | // It's unclear what the correct behavior is for a rune such as 'ffi', |
| 1585 | // a lowercase letter with no upper or title case and no SimpleFold. |
| 1586 | return 'a' <= r && r <= 'z' || 'A' <= r && r <= 'Z' || unicode.SimpleFold(r) != r |
| 1587 | } |
| 1588 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1589 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·isspace |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1590 | func string_isspace(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1591 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1592 | return nil, err |
| 1593 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1594 | recv := string(b.Receiver().(String)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1595 | for _, r := range recv { |
| 1596 | if !unicode.IsSpace(r) { |
| 1597 | return False, nil |
| 1598 | } |
| 1599 | } |
| 1600 | return Bool(recv != ""), nil |
| 1601 | } |
| 1602 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1603 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·istitle |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1604 | func string_istitle(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1605 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1606 | return nil, err |
| 1607 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1608 | recv := string(b.Receiver().(String)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1609 | |
| 1610 | // Python semantics differ from x==strings.{To,}Title(x) in Go: |
| 1611 | // "uppercase characters may only follow uncased characters and |
| 1612 | // lowercase characters only cased ones." |
| 1613 | var cased, prevCased bool |
| 1614 | for _, r := range recv { |
alandonovan | 4c43ff3 | 2018-11-02 14:50:48 -0400 | [diff] [blame] | 1615 | if 'A' <= r && r <= 'Z' || unicode.IsTitle(r) { // e.g. "Dž" |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1616 | if prevCased { |
| 1617 | return False, nil |
| 1618 | } |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1619 | prevCased = true |
alandonovan | 4c43ff3 | 2018-11-02 14:50:48 -0400 | [diff] [blame] | 1620 | cased = true |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1621 | } else if unicode.IsLower(r) { |
| 1622 | if !prevCased { |
| 1623 | return False, nil |
| 1624 | } |
| 1625 | prevCased = true |
| 1626 | cased = true |
alandonovan | 4c43ff3 | 2018-11-02 14:50:48 -0400 | [diff] [blame] | 1627 | } else if unicode.IsUpper(r) { |
| 1628 | return False, nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1629 | } else { |
| 1630 | prevCased = false |
| 1631 | } |
| 1632 | } |
| 1633 | return Bool(cased), nil |
| 1634 | } |
| 1635 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1636 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·isupper |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1637 | func string_isupper(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1638 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1639 | return nil, err |
| 1640 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1641 | recv := string(b.Receiver().(String)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1642 | return Bool(isCasedString(recv) && recv == strings.ToUpper(recv)), nil |
| 1643 | } |
| 1644 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1645 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·find |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1646 | func string_find(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1647 | return string_find_impl(b, args, kwargs, true, false) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1648 | } |
| 1649 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1650 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·format |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1651 | func string_format(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1652 | format := string(b.Receiver().(String)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1653 | var auto, manual bool // kinds of positional indexing used |
Josh Bleecher Snyder | 8cb25c8 | 2019-03-01 14:24:35 -0800 | [diff] [blame] | 1654 | buf := new(strings.Builder) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1655 | index := 0 |
| 1656 | for { |
alandonovan | 71da662 | 2017-11-28 22:08:16 -0500 | [diff] [blame] | 1657 | literal := format |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1658 | i := strings.IndexByte(format, '{') |
alandonovan | 71da662 | 2017-11-28 22:08:16 -0500 | [diff] [blame] | 1659 | if i >= 0 { |
| 1660 | literal = format[:i] |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1661 | } |
alandonovan | 71da662 | 2017-11-28 22:08:16 -0500 | [diff] [blame] | 1662 | |
| 1663 | // Replace "}}" with "}" in non-field portion, rejecting a lone '}'. |
| 1664 | for { |
| 1665 | j := strings.IndexByte(literal, '}') |
| 1666 | if j < 0 { |
| 1667 | buf.WriteString(literal) |
| 1668 | break |
| 1669 | } |
| 1670 | if len(literal) == j+1 || literal[j+1] != '}' { |
alandonovan | f223ef8 | 2019-03-12 16:06:40 -0400 | [diff] [blame] | 1671 | return nil, fmt.Errorf("format: single '}' in format") |
alandonovan | 71da662 | 2017-11-28 22:08:16 -0500 | [diff] [blame] | 1672 | } |
| 1673 | buf.WriteString(literal[:j+1]) |
| 1674 | literal = literal[j+2:] |
| 1675 | } |
| 1676 | |
| 1677 | if i < 0 { |
| 1678 | break // end of format string |
| 1679 | } |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1680 | |
| 1681 | if i+1 < len(format) && format[i+1] == '{' { |
| 1682 | // "{{" means a literal '{' |
| 1683 | buf.WriteByte('{') |
| 1684 | format = format[i+2:] |
| 1685 | continue |
| 1686 | } |
| 1687 | |
| 1688 | format = format[i+1:] |
| 1689 | i = strings.IndexByte(format, '}') |
| 1690 | if i < 0 { |
alandonovan | f223ef8 | 2019-03-12 16:06:40 -0400 | [diff] [blame] | 1691 | return nil, fmt.Errorf("format: unmatched '{' in format") |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1692 | } |
| 1693 | |
| 1694 | var arg Value |
| 1695 | conv := "s" |
| 1696 | var spec string |
| 1697 | |
| 1698 | field := format[:i] |
| 1699 | format = format[i+1:] |
| 1700 | |
| 1701 | var name string |
| 1702 | if i := strings.IndexByte(field, '!'); i < 0 { |
| 1703 | // "name" or "name:spec" |
| 1704 | if i := strings.IndexByte(field, ':'); i < 0 { |
| 1705 | name = field |
| 1706 | } else { |
| 1707 | name = field[:i] |
| 1708 | spec = field[i+1:] |
| 1709 | } |
| 1710 | } else { |
| 1711 | // "name!conv" or "name!conv:spec" |
| 1712 | name = field[:i] |
| 1713 | field = field[i+1:] |
| 1714 | // "conv" or "conv:spec" |
| 1715 | if i := strings.IndexByte(field, ':'); i < 0 { |
| 1716 | conv = field |
| 1717 | } else { |
| 1718 | conv = field[:i] |
| 1719 | spec = field[i+1:] |
| 1720 | } |
| 1721 | } |
| 1722 | |
| 1723 | if name == "" { |
| 1724 | // "{}": automatic indexing |
| 1725 | if manual { |
alandonovan | f223ef8 | 2019-03-12 16:06:40 -0400 | [diff] [blame] | 1726 | return nil, fmt.Errorf("format: cannot switch from manual field specification to automatic field numbering") |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1727 | } |
| 1728 | auto = true |
| 1729 | if index >= len(args) { |
alandonovan | f223ef8 | 2019-03-12 16:06:40 -0400 | [diff] [blame] | 1730 | return nil, fmt.Errorf("format: tuple index out of range") |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1731 | } |
| 1732 | arg = args[index] |
| 1733 | index++ |
alandonovan | bf3b587 | 2019-01-15 09:15:30 -0500 | [diff] [blame] | 1734 | } else if num, ok := decimal(name); ok { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1735 | // positional argument |
| 1736 | if auto { |
alandonovan | f223ef8 | 2019-03-12 16:06:40 -0400 | [diff] [blame] | 1737 | return nil, fmt.Errorf("format: cannot switch from automatic field numbering to manual field specification") |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1738 | } |
| 1739 | manual = true |
| 1740 | if num >= len(args) { |
alandonovan | f223ef8 | 2019-03-12 16:06:40 -0400 | [diff] [blame] | 1741 | return nil, fmt.Errorf("format: tuple index out of range") |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1742 | } else { |
| 1743 | arg = args[num] |
| 1744 | } |
| 1745 | } else { |
| 1746 | // keyword argument |
| 1747 | for _, kv := range kwargs { |
| 1748 | if string(kv[0].(String)) == name { |
| 1749 | arg = kv[1] |
| 1750 | break |
| 1751 | } |
| 1752 | } |
| 1753 | if arg == nil { |
Alan Donovan | e3deafe | 2018-10-23 11:05:09 -0400 | [diff] [blame] | 1754 | // Starlark does not support Python's x.y or a[i] syntaxes, |
alandonovan | 71da662 | 2017-11-28 22:08:16 -0500 | [diff] [blame] | 1755 | // or nested use of {...}. |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1756 | if strings.Contains(name, ".") { |
alandonovan | f223ef8 | 2019-03-12 16:06:40 -0400 | [diff] [blame] | 1757 | return nil, fmt.Errorf("format: attribute syntax x.y is not supported in replacement fields: %s", name) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1758 | } |
| 1759 | if strings.Contains(name, "[") { |
alandonovan | f223ef8 | 2019-03-12 16:06:40 -0400 | [diff] [blame] | 1760 | return nil, fmt.Errorf("format: element syntax a[i] is not supported in replacement fields: %s", name) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1761 | } |
alandonovan | 71da662 | 2017-11-28 22:08:16 -0500 | [diff] [blame] | 1762 | if strings.Contains(name, "{") { |
alandonovan | f223ef8 | 2019-03-12 16:06:40 -0400 | [diff] [blame] | 1763 | return nil, fmt.Errorf("format: nested replacement fields not supported") |
alandonovan | 71da662 | 2017-11-28 22:08:16 -0500 | [diff] [blame] | 1764 | } |
alandonovan | f223ef8 | 2019-03-12 16:06:40 -0400 | [diff] [blame] | 1765 | return nil, fmt.Errorf("format: keyword %s not found", name) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1766 | } |
| 1767 | } |
| 1768 | |
| 1769 | if spec != "" { |
Alan Donovan | e3deafe | 2018-10-23 11:05:09 -0400 | [diff] [blame] | 1770 | // Starlark does not support Python's format_spec features. |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1771 | return nil, fmt.Errorf("format spec features not supported in replacement fields: %s", spec) |
| 1772 | } |
| 1773 | |
| 1774 | switch conv { |
| 1775 | case "s": |
| 1776 | if str, ok := AsString(arg); ok { |
| 1777 | buf.WriteString(str) |
| 1778 | } else { |
Josh Bleecher Snyder | 8cb25c8 | 2019-03-01 14:24:35 -0800 | [diff] [blame] | 1779 | writeValue(buf, arg, nil) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1780 | } |
| 1781 | case "r": |
Josh Bleecher Snyder | 8cb25c8 | 2019-03-01 14:24:35 -0800 | [diff] [blame] | 1782 | writeValue(buf, arg, nil) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1783 | default: |
alandonovan | f223ef8 | 2019-03-12 16:06:40 -0400 | [diff] [blame] | 1784 | return nil, fmt.Errorf("format: unknown conversion %q", conv) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1785 | } |
| 1786 | } |
| 1787 | return String(buf.String()), nil |
| 1788 | } |
| 1789 | |
alandonovan | bf3b587 | 2019-01-15 09:15:30 -0500 | [diff] [blame] | 1790 | // decimal interprets s as a sequence of decimal digits. |
| 1791 | func decimal(s string) (x int, ok bool) { |
| 1792 | n := len(s) |
| 1793 | for i := 0; i < n; i++ { |
| 1794 | digit := s[i] - '0' |
| 1795 | if digit > 9 { |
| 1796 | return 0, false |
| 1797 | } |
| 1798 | x = x*10 + int(digit) |
| 1799 | if x < 0 { |
| 1800 | return 0, false // underflow |
| 1801 | } |
| 1802 | } |
| 1803 | return x, true |
| 1804 | } |
| 1805 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1806 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·index |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1807 | func string_index(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1808 | return string_find_impl(b, args, kwargs, false, false) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1809 | } |
| 1810 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1811 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·join |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1812 | func string_join(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1813 | recv := string(b.Receiver().(String)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1814 | var iterable Iterable |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1815 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 1, &iterable); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1816 | return nil, err |
| 1817 | } |
| 1818 | iter := iterable.Iterate() |
| 1819 | defer iter.Done() |
Josh Bleecher Snyder | 8cb25c8 | 2019-03-01 14:24:35 -0800 | [diff] [blame] | 1820 | buf := new(strings.Builder) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1821 | var x Value |
| 1822 | for i := 0; iter.Next(&x); i++ { |
| 1823 | if i > 0 { |
| 1824 | buf.WriteString(recv) |
| 1825 | } |
Diego Siqueira | 6cae335 | 2017-10-08 01:16:14 +0200 | [diff] [blame] | 1826 | s, ok := AsString(x) |
| 1827 | if !ok { |
alandonovan | f223ef8 | 2019-03-12 16:06:40 -0400 | [diff] [blame] | 1828 | return nil, fmt.Errorf("join: in list, want string, got %s", x.Type()) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1829 | } |
Diego Siqueira | 6cae335 | 2017-10-08 01:16:14 +0200 | [diff] [blame] | 1830 | buf.WriteString(s) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1831 | } |
| 1832 | return String(buf.String()), nil |
| 1833 | } |
| 1834 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1835 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·lower |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1836 | func string_lower(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1837 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1838 | return nil, err |
| 1839 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1840 | return String(strings.ToLower(string(b.Receiver().(String)))), nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1841 | } |
| 1842 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1843 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·partition |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1844 | func string_partition(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1845 | recv := string(b.Receiver().(String)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1846 | var sep string |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1847 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 1, &sep); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1848 | return nil, err |
| 1849 | } |
| 1850 | if sep == "" { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1851 | return nil, nameErr(b, "empty separator") |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1852 | } |
| 1853 | var i int |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1854 | if b.Name()[0] == 'p' { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1855 | i = strings.Index(recv, sep) // partition |
| 1856 | } else { |
| 1857 | i = strings.LastIndex(recv, sep) // rpartition |
| 1858 | } |
| 1859 | tuple := make(Tuple, 0, 3) |
| 1860 | if i < 0 { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1861 | if b.Name()[0] == 'p' { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1862 | tuple = append(tuple, String(recv), String(""), String("")) |
| 1863 | } else { |
| 1864 | tuple = append(tuple, String(""), String(""), String(recv)) |
| 1865 | } |
| 1866 | } else { |
| 1867 | tuple = append(tuple, String(recv[:i]), String(sep), String(recv[i+len(sep):])) |
| 1868 | } |
| 1869 | return tuple, nil |
| 1870 | } |
| 1871 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1872 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·replace |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1873 | func string_replace(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1874 | recv := string(b.Receiver().(String)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1875 | var old, new string |
| 1876 | count := -1 |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1877 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 2, &old, &new, &count); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1878 | return nil, err |
| 1879 | } |
| 1880 | return String(strings.Replace(recv, old, new, count)), nil |
| 1881 | } |
| 1882 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1883 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·rfind |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1884 | func string_rfind(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1885 | return string_find_impl(b, args, kwargs, true, true) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1886 | } |
| 1887 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1888 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·rindex |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1889 | func string_rindex(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1890 | return string_find_impl(b, args, kwargs, false, true) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1891 | } |
| 1892 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1893 | // https://github.com/google/starlark-go/starlark/blob/master/doc/spec.md#string·startswith |
| 1894 | // https://github.com/google/starlark-go/starlark/blob/master/doc/spec.md#string·endswith |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1895 | func string_startswith(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | f5fb4d2 | 2018-06-25 11:31:34 -0400 | [diff] [blame] | 1896 | var x Value |
| 1897 | var start, end Value = None, None |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1898 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 1, &x, &start, &end); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1899 | return nil, err |
| 1900 | } |
alandonovan | f5fb4d2 | 2018-06-25 11:31:34 -0400 | [diff] [blame] | 1901 | |
| 1902 | // compute effective substring. |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1903 | s := string(b.Receiver().(String)) |
alandonovan | f5fb4d2 | 2018-06-25 11:31:34 -0400 | [diff] [blame] | 1904 | if start, end, err := indices(start, end, len(s)); err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1905 | return nil, nameErr(b, err) |
alandonovan | f5fb4d2 | 2018-06-25 11:31:34 -0400 | [diff] [blame] | 1906 | } else { |
| 1907 | if end < start { |
| 1908 | end = start // => empty result |
| 1909 | } |
| 1910 | s = s[start:end] |
| 1911 | } |
| 1912 | |
| 1913 | f := strings.HasPrefix |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1914 | if b.Name()[0] == 'e' { // endswith |
alandonovan | f5fb4d2 | 2018-06-25 11:31:34 -0400 | [diff] [blame] | 1915 | f = strings.HasSuffix |
| 1916 | } |
| 1917 | |
| 1918 | switch x := x.(type) { |
| 1919 | case Tuple: |
| 1920 | for i, x := range x { |
| 1921 | prefix, ok := AsString(x) |
| 1922 | if !ok { |
| 1923 | return nil, fmt.Errorf("%s: want string, got %s, for element %d", |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1924 | b.Name(), x.Type(), i) |
alandonovan | f5fb4d2 | 2018-06-25 11:31:34 -0400 | [diff] [blame] | 1925 | } |
| 1926 | if f(s, prefix) { |
| 1927 | return True, nil |
| 1928 | } |
| 1929 | } |
| 1930 | return False, nil |
| 1931 | case String: |
| 1932 | return Bool(f(s, string(x))), nil |
| 1933 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1934 | return nil, fmt.Errorf("%s: got %s, want string or tuple of string", b.Name(), x.Type()) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1935 | } |
| 1936 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1937 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·strip |
| 1938 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·lstrip |
| 1939 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·rstrip |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1940 | func string_strip(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1941 | var chars string |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1942 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0, &chars); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1943 | return nil, err |
| 1944 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1945 | recv := string(b.Receiver().(String)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1946 | var s string |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1947 | switch b.Name()[0] { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1948 | case 's': // strip |
| 1949 | if chars != "" { |
| 1950 | s = strings.Trim(recv, chars) |
| 1951 | } else { |
| 1952 | s = strings.TrimSpace(recv) |
| 1953 | } |
| 1954 | case 'l': // lstrip |
| 1955 | if chars != "" { |
| 1956 | s = strings.TrimLeft(recv, chars) |
| 1957 | } else { |
| 1958 | s = strings.TrimLeftFunc(recv, unicode.IsSpace) |
| 1959 | } |
| 1960 | case 'r': // rstrip |
| 1961 | if chars != "" { |
| 1962 | s = strings.TrimRight(recv, chars) |
| 1963 | } else { |
| 1964 | s = strings.TrimRightFunc(recv, unicode.IsSpace) |
| 1965 | } |
| 1966 | } |
| 1967 | return String(s), nil |
| 1968 | } |
| 1969 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1970 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·title |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1971 | func string_title(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1972 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1973 | return nil, err |
| 1974 | } |
alandonovan | 4c43ff3 | 2018-11-02 14:50:48 -0400 | [diff] [blame] | 1975 | |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1976 | s := string(b.Receiver().(String)) |
alandonovan | 4c43ff3 | 2018-11-02 14:50:48 -0400 | [diff] [blame] | 1977 | |
| 1978 | // Python semantics differ from x==strings.{To,}Title(x) in Go: |
| 1979 | // "uppercase characters may only follow uncased characters and |
| 1980 | // lowercase characters only cased ones." |
Josh Bleecher Snyder | 8cb25c8 | 2019-03-01 14:24:35 -0800 | [diff] [blame] | 1981 | buf := new(strings.Builder) |
alandonovan | 4c43ff3 | 2018-11-02 14:50:48 -0400 | [diff] [blame] | 1982 | buf.Grow(len(s)) |
| 1983 | var prevCased bool |
| 1984 | for _, r := range s { |
| 1985 | if prevCased { |
| 1986 | r = unicode.ToLower(r) |
| 1987 | } else { |
| 1988 | r = unicode.ToTitle(r) |
| 1989 | } |
| 1990 | prevCased = isCasedRune(r) |
| 1991 | buf.WriteRune(r) |
| 1992 | } |
| 1993 | return String(buf.String()), nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1994 | } |
| 1995 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 1996 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·upper |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 1997 | func string_upper(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 1998 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1999 | return nil, err |
| 2000 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2001 | return String(strings.ToUpper(string(b.Receiver().(String)))), nil |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2002 | } |
| 2003 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 2004 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·split |
| 2005 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·rsplit |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 2006 | func string_split(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2007 | recv := string(b.Receiver().(String)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2008 | var sep_ Value |
| 2009 | maxsplit := -1 |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2010 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0, &sep_, &maxsplit); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2011 | return nil, err |
| 2012 | } |
| 2013 | |
| 2014 | var res []string |
| 2015 | |
| 2016 | if sep_ == nil || sep_ == None { |
| 2017 | // special case: split on whitespace |
alandonovan | 7b65d16 | 2017-11-01 16:35:47 -0400 | [diff] [blame] | 2018 | if maxsplit < 0 { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2019 | res = strings.Fields(recv) |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2020 | } else if b.Name() == "split" { |
Garrett Squire | d6768aa | 2017-10-31 20:33:53 -0700 | [diff] [blame] | 2021 | res = splitspace(recv, maxsplit) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2022 | } else { // rsplit |
Garrett Squire | d6768aa | 2017-10-31 20:33:53 -0700 | [diff] [blame] | 2023 | res = rsplitspace(recv, maxsplit) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2024 | } |
| 2025 | |
| 2026 | } else if sep, ok := AsString(sep_); ok { |
| 2027 | if sep == "" { |
Diego Siqueira | ff22b09 | 2017-10-04 12:14:33 +0200 | [diff] [blame] | 2028 | return nil, fmt.Errorf("split: empty separator") |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2029 | } |
| 2030 | // usual case: split on non-empty separator |
alandonovan | 7b65d16 | 2017-11-01 16:35:47 -0400 | [diff] [blame] | 2031 | if maxsplit < 0 { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2032 | res = strings.Split(recv, sep) |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2033 | } else if b.Name() == "split" { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2034 | res = strings.SplitN(recv, sep, maxsplit+1) |
| 2035 | } else { // rsplit |
| 2036 | res = strings.Split(recv, sep) |
| 2037 | if excess := len(res) - maxsplit; excess > 0 { |
| 2038 | res[0] = strings.Join(res[:excess], sep) |
| 2039 | res = append(res[:1], res[excess:]...) |
| 2040 | } |
| 2041 | } |
| 2042 | |
| 2043 | } else { |
Diego Siqueira | ff22b09 | 2017-10-04 12:14:33 +0200 | [diff] [blame] | 2044 | return nil, fmt.Errorf("split: got %s for separator, want string", sep_.Type()) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2045 | } |
| 2046 | |
| 2047 | list := make([]Value, len(res)) |
| 2048 | for i, x := range res { |
| 2049 | list[i] = String(x) |
| 2050 | } |
| 2051 | return NewList(list), nil |
| 2052 | } |
| 2053 | |
alandonovan | 7b65d16 | 2017-11-01 16:35:47 -0400 | [diff] [blame] | 2054 | // Precondition: max >= 0. |
Garrett Squire | d6768aa | 2017-10-31 20:33:53 -0700 | [diff] [blame] | 2055 | func rsplitspace(s string, max int) []string { |
| 2056 | res := make([]string, 0, max+1) |
| 2057 | end := -1 // index of field end, or -1 in a region of spaces. |
| 2058 | for i := len(s); i > 0; { |
| 2059 | r, sz := utf8.DecodeLastRuneInString(s[:i]) |
| 2060 | if unicode.IsSpace(r) { |
| 2061 | if end >= 0 { |
| 2062 | if len(res) == max { |
| 2063 | break // let this field run to the start |
| 2064 | } |
| 2065 | res = append(res, s[i:end]) |
| 2066 | end = -1 |
| 2067 | } |
| 2068 | } else if end < 0 { |
| 2069 | end = i |
| 2070 | } |
| 2071 | i -= sz |
| 2072 | } |
| 2073 | if end >= 0 { |
| 2074 | res = append(res, s[:end]) |
| 2075 | } |
| 2076 | |
| 2077 | resLen := len(res) |
| 2078 | for i := 0; i < resLen/2; i++ { |
| 2079 | res[i], res[resLen-1-i] = res[resLen-1-i], res[i] |
| 2080 | } |
| 2081 | |
| 2082 | return res |
| 2083 | } |
| 2084 | |
alandonovan | 7b65d16 | 2017-11-01 16:35:47 -0400 | [diff] [blame] | 2085 | // Precondition: max >= 0. |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2086 | func splitspace(s string, max int) []string { |
| 2087 | var res []string |
| 2088 | start := -1 // index of field start, or -1 in a region of spaces |
| 2089 | for i, r := range s { |
| 2090 | if unicode.IsSpace(r) { |
| 2091 | if start >= 0 { |
Garrett Squire | d6768aa | 2017-10-31 20:33:53 -0700 | [diff] [blame] | 2092 | if len(res) == max { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2093 | break // let this field run to the end |
| 2094 | } |
| 2095 | res = append(res, s[start:i]) |
| 2096 | start = -1 |
| 2097 | } |
| 2098 | } else if start == -1 { |
| 2099 | start = i |
| 2100 | } |
| 2101 | } |
| 2102 | if start >= 0 { |
| 2103 | res = append(res, s[start:]) |
| 2104 | } |
| 2105 | return res |
| 2106 | } |
| 2107 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 2108 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#string·splitlines |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 2109 | func string_splitlines(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2110 | var keepends bool |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2111 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0, &keepends); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2112 | return nil, err |
| 2113 | } |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2114 | var lines []string |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2115 | if s := string(b.Receiver().(String)); s != "" { |
alandonovan | 266cd6f | 2019-02-13 19:04:37 -0500 | [diff] [blame] | 2116 | // TODO(adonovan): handle CRLF correctly. |
| 2117 | if keepends { |
| 2118 | lines = strings.SplitAfter(s, "\n") |
| 2119 | } else { |
| 2120 | lines = strings.Split(s, "\n") |
| 2121 | } |
| 2122 | if strings.HasSuffix(s, "\n") { |
| 2123 | lines = lines[:len(lines)-1] |
| 2124 | } |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2125 | } |
| 2126 | list := make([]Value, len(lines)) |
| 2127 | for i, x := range lines { |
| 2128 | list[i] = String(x) |
| 2129 | } |
| 2130 | return NewList(list), nil |
| 2131 | } |
| 2132 | |
alandonovan | 04aba6e | 2018-11-05 17:45:33 -0500 | [diff] [blame] | 2133 | // https://github.com/google/starlark-go/blob/master/doc/spec.md#set·union. |
Edward McFarlane | 8dd3e2e | 2020-03-06 20:57:01 +0000 | [diff] [blame] | 2134 | func set_union(_ *Thread, b *Builtin, args Tuple, kwargs []Tuple) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2135 | var iterable Iterable |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2136 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 0, &iterable); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2137 | return nil, err |
| 2138 | } |
| 2139 | iter := iterable.Iterate() |
| 2140 | defer iter.Done() |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2141 | union, err := b.Receiver().(*Set).Union(iter) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2142 | if err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2143 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2144 | } |
| 2145 | return union, nil |
| 2146 | } |
| 2147 | |
| 2148 | // Common implementation of string_{r}{find,index}. |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2149 | func string_find_impl(b *Builtin, args Tuple, kwargs []Tuple, allowError, last bool) (Value, error) { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2150 | var sub string |
| 2151 | var start_, end_ Value |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2152 | if err := UnpackPositionalArgs(b.Name(), args, kwargs, 1, &sub, &start_, &end_); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2153 | return nil, err |
| 2154 | } |
| 2155 | |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2156 | s := string(b.Receiver().(String)) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2157 | start, end, err := indices(start_, end_, len(s)) |
| 2158 | if err != nil { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2159 | return nil, nameErr(b, err) |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2160 | } |
| 2161 | var slice string |
| 2162 | if start < end { |
| 2163 | slice = s[start:end] |
| 2164 | } |
| 2165 | |
| 2166 | var i int |
| 2167 | if last { |
| 2168 | i = strings.LastIndex(slice, sub) |
| 2169 | } else { |
| 2170 | i = strings.Index(slice, sub) |
| 2171 | } |
| 2172 | if i < 0 { |
| 2173 | if !allowError { |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2174 | return nil, nameErr(b, "substring not found") |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2175 | } |
| 2176 | return MakeInt(-1), nil |
| 2177 | } |
| 2178 | return MakeInt(i + start), nil |
| 2179 | } |
| 2180 | |
| 2181 | // Common implementation of builtin dict function and dict.update method. |
| 2182 | // Precondition: len(updates) == 0 or 1. |
| 2183 | func updateDict(dict *Dict, updates Tuple, kwargs []Tuple) error { |
| 2184 | if len(updates) == 1 { |
| 2185 | switch updates := updates[0].(type) { |
alandonovan | 1ed6497 | 2019-01-04 13:04:39 -0500 | [diff] [blame] | 2186 | case IterableMapping: |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2187 | // Iterate over dict's key/value pairs, not just keys. |
| 2188 | for _, item := range updates.Items() { |
jmillikin-stripe | 3ccab94 | 2018-10-05 07:09:12 -0700 | [diff] [blame] | 2189 | if err := dict.SetKey(item[0], item[1]); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2190 | return err // dict is frozen |
| 2191 | } |
| 2192 | } |
| 2193 | default: |
| 2194 | // all other sequences |
| 2195 | iter := Iterate(updates) |
| 2196 | if iter == nil { |
| 2197 | return fmt.Errorf("got %s, want iterable", updates.Type()) |
| 2198 | } |
| 2199 | defer iter.Done() |
| 2200 | var pair Value |
| 2201 | for i := 0; iter.Next(&pair); i++ { |
| 2202 | iter2 := Iterate(pair) |
| 2203 | if iter2 == nil { |
| 2204 | return fmt.Errorf("dictionary update sequence element #%d is not iterable (%s)", i, pair.Type()) |
| 2205 | |
| 2206 | } |
| 2207 | defer iter2.Done() |
| 2208 | len := Len(pair) |
| 2209 | if len < 0 { |
| 2210 | return fmt.Errorf("dictionary update sequence element #%d has unknown length (%s)", i, pair.Type()) |
| 2211 | } else if len != 2 { |
| 2212 | return fmt.Errorf("dictionary update sequence element #%d has length %d, want 2", i, len) |
| 2213 | } |
| 2214 | var k, v Value |
| 2215 | iter2.Next(&k) |
| 2216 | iter2.Next(&v) |
jmillikin-stripe | 3ccab94 | 2018-10-05 07:09:12 -0700 | [diff] [blame] | 2217 | if err := dict.SetKey(k, v); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2218 | return err |
| 2219 | } |
| 2220 | } |
| 2221 | } |
| 2222 | } |
| 2223 | |
| 2224 | // Then add the kwargs. |
Josh Bleecher Snyder | 66ac3a2 | 2018-12-12 17:54:30 -0800 | [diff] [blame] | 2225 | before := dict.Len() |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2226 | for _, pair := range kwargs { |
jmillikin-stripe | 3ccab94 | 2018-10-05 07:09:12 -0700 | [diff] [blame] | 2227 | if err := dict.SetKey(pair[0], pair[1]); err != nil { |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2228 | return err // dict is frozen |
| 2229 | } |
| 2230 | } |
Josh Bleecher Snyder | 66ac3a2 | 2018-12-12 17:54:30 -0800 | [diff] [blame] | 2231 | // In the common case, each kwarg will add another dict entry. |
| 2232 | // If that's not so, check whether it is because there was a duplicate kwarg. |
| 2233 | if dict.Len() < before+len(kwargs) { |
| 2234 | keys := make(map[String]bool, len(kwargs)) |
| 2235 | for _, kv := range kwargs { |
| 2236 | k := kv[0].(String) |
| 2237 | if keys[k] { |
| 2238 | return fmt.Errorf("duplicate keyword arg: %v", k) |
| 2239 | } |
| 2240 | keys[k] = true |
| 2241 | } |
| 2242 | } |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 2243 | |
| 2244 | return nil |
| 2245 | } |
alandonovan | 34f0211 | 2019-04-19 14:28:27 -0400 | [diff] [blame] | 2246 | |
| 2247 | // nameErr returns an error message of the form "name: msg" |
| 2248 | // where name is b.Name() and msg is a string or error. |
| 2249 | func nameErr(b *Builtin, msg interface{}) error { |
| 2250 | return fmt.Errorf("%s: %v", b.Name(), msg) |
| 2251 | } |