Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 1 | "Usage: unparse.py <path to source file>" |
| 2 | import sys |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 3 | import ast |
Mark Dickinson | 82c8d93 | 2010-06-29 07:48:23 +0000 | [diff] [blame] | 4 | import tokenize |
Collin Winter | 6f2df4d | 2007-07-17 20:59:35 +0000 | [diff] [blame] | 5 | import io |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 6 | import os |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 7 | |
Mark Dickinson | cba8c10 | 2010-06-30 11:45:53 +0000 | [diff] [blame] | 8 | # Large float and imaginary literals get turned into infinities in the AST. |
| 9 | # We unparse those infinities to INFSTR. |
| 10 | INFSTR = "1e" + repr(sys.float_info.max_10_exp + 1) |
| 11 | |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 12 | def interleave(inter, f, seq): |
| 13 | """Call f on each item in seq, calling inter() in between. |
| 14 | """ |
| 15 | seq = iter(seq) |
| 16 | try: |
Collin Winter | 6f2df4d | 2007-07-17 20:59:35 +0000 | [diff] [blame] | 17 | f(next(seq)) |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 18 | except StopIteration: |
| 19 | pass |
| 20 | else: |
| 21 | for x in seq: |
| 22 | inter() |
| 23 | f(x) |
| 24 | |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 25 | class Unparser: |
| 26 | """Methods in this class recursively traverse an AST and |
| 27 | output source code for the abstract syntax; original formatting |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 28 | is disregarded. """ |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 29 | |
| 30 | def __init__(self, tree, file = sys.stdout): |
| 31 | """Unparser(tree, file=sys.stdout) -> None. |
| 32 | Print the source for tree to file.""" |
| 33 | self.f = file |
| 34 | self._indent = 0 |
| 35 | self.dispatch(tree) |
Collin Winter | 6f2df4d | 2007-07-17 20:59:35 +0000 | [diff] [blame] | 36 | print("", file=self.f) |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 37 | self.f.flush() |
| 38 | |
| 39 | def fill(self, text = ""): |
| 40 | "Indent a piece of text, according to the current indentation level" |
| 41 | self.f.write("\n"+" "*self._indent + text) |
| 42 | |
| 43 | def write(self, text): |
| 44 | "Append a piece of text to the current line." |
| 45 | self.f.write(text) |
| 46 | |
| 47 | def enter(self): |
| 48 | "Print ':', and increase the indentation." |
| 49 | self.write(":") |
| 50 | self._indent += 1 |
| 51 | |
| 52 | def leave(self): |
| 53 | "Decrease the indentation level." |
| 54 | self._indent -= 1 |
| 55 | |
| 56 | def dispatch(self, tree): |
| 57 | "Dispatcher function, dispatching tree type T to method _T." |
| 58 | if isinstance(tree, list): |
| 59 | for t in tree: |
| 60 | self.dispatch(t) |
| 61 | return |
| 62 | meth = getattr(self, "_"+tree.__class__.__name__) |
| 63 | meth(tree) |
| 64 | |
| 65 | |
| 66 | ############### Unparsing methods ###################### |
| 67 | # There should be one method per concrete grammar type # |
| 68 | # Constructors should be grouped by sum type. Ideally, # |
| 69 | # this would follow the order in the grammar, but # |
| 70 | # currently doesn't. # |
| 71 | ######################################################## |
| 72 | |
| 73 | def _Module(self, tree): |
| 74 | for stmt in tree.body: |
| 75 | self.dispatch(stmt) |
| 76 | |
| 77 | # stmt |
| 78 | def _Expr(self, tree): |
| 79 | self.fill() |
| 80 | self.dispatch(tree.value) |
| 81 | |
| 82 | def _Import(self, t): |
| 83 | self.fill("import ") |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 84 | interleave(lambda: self.write(", "), self.dispatch, t.names) |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 85 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 86 | def _ImportFrom(self, t): |
| 87 | self.fill("from ") |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 88 | self.write("." * t.level) |
| 89 | if t.module: |
| 90 | self.write(t.module) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 91 | self.write(" import ") |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 92 | interleave(lambda: self.write(", "), self.dispatch, t.names) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 93 | |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 94 | def _Assign(self, t): |
| 95 | self.fill() |
| 96 | for target in t.targets: |
| 97 | self.dispatch(target) |
| 98 | self.write(" = ") |
| 99 | self.dispatch(t.value) |
| 100 | |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 101 | def _AugAssign(self, t): |
| 102 | self.fill() |
| 103 | self.dispatch(t.target) |
| 104 | self.write(" "+self.binop[t.op.__class__.__name__]+"= ") |
| 105 | self.dispatch(t.value) |
| 106 | |
| 107 | def _Return(self, t): |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 108 | self.fill("return") |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 109 | if t.value: |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 110 | self.write(" ") |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 111 | self.dispatch(t.value) |
| 112 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 113 | def _Pass(self, t): |
| 114 | self.fill("pass") |
| 115 | |
| 116 | def _Break(self, t): |
| 117 | self.fill("break") |
| 118 | |
| 119 | def _Continue(self, t): |
| 120 | self.fill("continue") |
| 121 | |
| 122 | def _Delete(self, t): |
| 123 | self.fill("del ") |
Mark Dickinson | ae10005 | 2010-06-28 19:44:20 +0000 | [diff] [blame] | 124 | interleave(lambda: self.write(", "), self.dispatch, t.targets) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 125 | |
| 126 | def _Assert(self, t): |
| 127 | self.fill("assert ") |
| 128 | self.dispatch(t.test) |
| 129 | if t.msg: |
| 130 | self.write(", ") |
| 131 | self.dispatch(t.msg) |
| 132 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 133 | def _Global(self, t): |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 134 | self.fill("global ") |
| 135 | interleave(lambda: self.write(", "), self.write, t.names) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 136 | |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 137 | def _Nonlocal(self, t): |
| 138 | self.fill("nonlocal ") |
| 139 | interleave(lambda: self.write(", "), self.write, t.names) |
| 140 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 141 | def _Yield(self, t): |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 142 | self.write("(") |
| 143 | self.write("yield") |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 144 | if t.value: |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 145 | self.write(" ") |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 146 | self.dispatch(t.value) |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 147 | self.write(")") |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 148 | |
Mark Dickinson | fe8440a | 2012-05-06 17:35:19 +0100 | [diff] [blame] | 149 | def _YieldFrom(self, t): |
| 150 | self.write("(") |
| 151 | self.write("yield from") |
| 152 | if t.value: |
| 153 | self.write(" ") |
| 154 | self.dispatch(t.value) |
| 155 | self.write(")") |
| 156 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 157 | def _Raise(self, t): |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 158 | self.fill("raise") |
| 159 | if not t.exc: |
| 160 | assert not t.cause |
| 161 | return |
| 162 | self.write(" ") |
| 163 | self.dispatch(t.exc) |
| 164 | if t.cause: |
| 165 | self.write(" from ") |
| 166 | self.dispatch(t.cause) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 167 | |
Mark Dickinson | fe8440a | 2012-05-06 17:35:19 +0100 | [diff] [blame] | 168 | def _Try(self, t): |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 169 | self.fill("try") |
| 170 | self.enter() |
| 171 | self.dispatch(t.body) |
| 172 | self.leave() |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 173 | for ex in t.handlers: |
| 174 | self.dispatch(ex) |
| 175 | if t.orelse: |
| 176 | self.fill("else") |
| 177 | self.enter() |
| 178 | self.dispatch(t.orelse) |
| 179 | self.leave() |
Mark Dickinson | fe8440a | 2012-05-06 17:35:19 +0100 | [diff] [blame] | 180 | if t.finalbody: |
| 181 | self.fill("finally") |
Mark Dickinson | 81ad8cc | 2010-06-30 08:46:53 +0000 | [diff] [blame] | 182 | self.enter() |
Mark Dickinson | fe8440a | 2012-05-06 17:35:19 +0100 | [diff] [blame] | 183 | self.dispatch(t.finalbody) |
Mark Dickinson | 81ad8cc | 2010-06-30 08:46:53 +0000 | [diff] [blame] | 184 | self.leave() |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 185 | |
Benjamin Peterson | c4fe6f3 | 2008-08-19 18:57:56 +0000 | [diff] [blame] | 186 | def _ExceptHandler(self, t): |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 187 | self.fill("except") |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 188 | if t.type: |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 189 | self.write(" ") |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 190 | self.dispatch(t.type) |
| 191 | if t.name: |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 192 | self.write(" as ") |
| 193 | self.write(t.name) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 194 | self.enter() |
| 195 | self.dispatch(t.body) |
| 196 | self.leave() |
| 197 | |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 198 | def _ClassDef(self, t): |
| 199 | self.write("\n") |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 200 | for deco in t.decorator_list: |
| 201 | self.fill("@") |
| 202 | self.dispatch(deco) |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 203 | self.fill("class "+t.name) |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 204 | self.write("(") |
| 205 | comma = False |
| 206 | for e in t.bases: |
| 207 | if comma: self.write(", ") |
| 208 | else: comma = True |
| 209 | self.dispatch(e) |
| 210 | for e in t.keywords: |
| 211 | if comma: self.write(", ") |
| 212 | else: comma = True |
| 213 | self.dispatch(e) |
| 214 | if t.starargs: |
| 215 | if comma: self.write(", ") |
| 216 | else: comma = True |
| 217 | self.write("*") |
| 218 | self.dispatch(t.starargs) |
| 219 | if t.kwargs: |
| 220 | if comma: self.write(", ") |
| 221 | else: comma = True |
Mark Dickinson | 578aa56 | 2010-06-29 18:38:59 +0000 | [diff] [blame] | 222 | self.write("**") |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 223 | self.dispatch(t.kwargs) |
| 224 | self.write(")") |
| 225 | |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 226 | self.enter() |
| 227 | self.dispatch(t.body) |
| 228 | self.leave() |
| 229 | |
| 230 | def _FunctionDef(self, t): |
| 231 | self.write("\n") |
Benjamin Peterson | c4fe6f3 | 2008-08-19 18:57:56 +0000 | [diff] [blame] | 232 | for deco in t.decorator_list: |
Thomas Wouters | 89f507f | 2006-12-13 04:49:30 +0000 | [diff] [blame] | 233 | self.fill("@") |
| 234 | self.dispatch(deco) |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 235 | self.fill("def "+t.name + "(") |
| 236 | self.dispatch(t.args) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 237 | self.write(")") |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 238 | if t.returns: |
| 239 | self.write(" -> ") |
| 240 | self.dispatch(t.returns) |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 241 | self.enter() |
| 242 | self.dispatch(t.body) |
| 243 | self.leave() |
| 244 | |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 245 | def _For(self, t): |
| 246 | self.fill("for ") |
| 247 | self.dispatch(t.target) |
| 248 | self.write(" in ") |
| 249 | self.dispatch(t.iter) |
| 250 | self.enter() |
| 251 | self.dispatch(t.body) |
| 252 | self.leave() |
| 253 | if t.orelse: |
| 254 | self.fill("else") |
| 255 | self.enter() |
| 256 | self.dispatch(t.orelse) |
Mark Dickinson | ae10005 | 2010-06-28 19:44:20 +0000 | [diff] [blame] | 257 | self.leave() |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 258 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 259 | def _If(self, t): |
| 260 | self.fill("if ") |
| 261 | self.dispatch(t.test) |
| 262 | self.enter() |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 263 | self.dispatch(t.body) |
| 264 | self.leave() |
Mark Dickinson | 8d6d760 | 2010-06-30 08:32:11 +0000 | [diff] [blame] | 265 | # collapse nested ifs into equivalent elifs. |
| 266 | while (t.orelse and len(t.orelse) == 1 and |
| 267 | isinstance(t.orelse[0], ast.If)): |
| 268 | t = t.orelse[0] |
| 269 | self.fill("elif ") |
| 270 | self.dispatch(t.test) |
| 271 | self.enter() |
| 272 | self.dispatch(t.body) |
| 273 | self.leave() |
| 274 | # final else |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 275 | if t.orelse: |
| 276 | self.fill("else") |
| 277 | self.enter() |
| 278 | self.dispatch(t.orelse) |
| 279 | self.leave() |
| 280 | |
| 281 | def _While(self, t): |
| 282 | self.fill("while ") |
| 283 | self.dispatch(t.test) |
| 284 | self.enter() |
| 285 | self.dispatch(t.body) |
| 286 | self.leave() |
| 287 | if t.orelse: |
| 288 | self.fill("else") |
| 289 | self.enter() |
| 290 | self.dispatch(t.orelse) |
Mark Dickinson | ae10005 | 2010-06-28 19:44:20 +0000 | [diff] [blame] | 291 | self.leave() |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 292 | |
| 293 | def _With(self, t): |
| 294 | self.fill("with ") |
Mark Dickinson | fe8440a | 2012-05-06 17:35:19 +0100 | [diff] [blame] | 295 | interleave(lambda: self.write(", "), self.dispatch, t.items) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 296 | self.enter() |
| 297 | self.dispatch(t.body) |
| 298 | self.leave() |
| 299 | |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 300 | # expr |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 301 | def _Bytes(self, t): |
| 302 | self.write(repr(t.s)) |
| 303 | |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 304 | def _Str(self, tree): |
| 305 | self.write(repr(tree.s)) |
| 306 | |
| 307 | def _Name(self, t): |
| 308 | self.write(t.id) |
| 309 | |
Benjamin Peterson | 442f209 | 2012-12-06 17:41:04 -0500 | [diff] [blame^] | 310 | def _NameConstant(self, t): |
| 311 | self.write(repr(t.value)) |
| 312 | |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 313 | def _Num(self, t): |
Mark Dickinson | cba8c10 | 2010-06-30 11:45:53 +0000 | [diff] [blame] | 314 | # Substitute overflowing decimal literal for AST infinities. |
| 315 | self.write(repr(t.n).replace("inf", INFSTR)) |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 316 | |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 317 | def _List(self, t): |
| 318 | self.write("[") |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 319 | interleave(lambda: self.write(", "), self.dispatch, t.elts) |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 320 | self.write("]") |
| 321 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 322 | def _ListComp(self, t): |
| 323 | self.write("[") |
| 324 | self.dispatch(t.elt) |
| 325 | for gen in t.generators: |
| 326 | self.dispatch(gen) |
| 327 | self.write("]") |
| 328 | |
| 329 | def _GeneratorExp(self, t): |
| 330 | self.write("(") |
| 331 | self.dispatch(t.elt) |
| 332 | for gen in t.generators: |
| 333 | self.dispatch(gen) |
| 334 | self.write(")") |
| 335 | |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 336 | def _SetComp(self, t): |
| 337 | self.write("{") |
| 338 | self.dispatch(t.elt) |
| 339 | for gen in t.generators: |
| 340 | self.dispatch(gen) |
| 341 | self.write("}") |
| 342 | |
| 343 | def _DictComp(self, t): |
| 344 | self.write("{") |
| 345 | self.dispatch(t.key) |
| 346 | self.write(": ") |
| 347 | self.dispatch(t.value) |
| 348 | for gen in t.generators: |
| 349 | self.dispatch(gen) |
| 350 | self.write("}") |
| 351 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 352 | def _comprehension(self, t): |
| 353 | self.write(" for ") |
| 354 | self.dispatch(t.target) |
| 355 | self.write(" in ") |
| 356 | self.dispatch(t.iter) |
| 357 | for if_clause in t.ifs: |
| 358 | self.write(" if ") |
| 359 | self.dispatch(if_clause) |
| 360 | |
| 361 | def _IfExp(self, t): |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 362 | self.write("(") |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 363 | self.dispatch(t.body) |
| 364 | self.write(" if ") |
| 365 | self.dispatch(t.test) |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 366 | self.write(" else ") |
| 367 | self.dispatch(t.orelse) |
| 368 | self.write(")") |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 369 | |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 370 | def _Set(self, t): |
| 371 | assert(t.elts) # should be at least one element |
| 372 | self.write("{") |
| 373 | interleave(lambda: self.write(", "), self.dispatch, t.elts) |
| 374 | self.write("}") |
| 375 | |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 376 | def _Dict(self, t): |
| 377 | self.write("{") |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 378 | def write_pair(pair): |
| 379 | (k, v) = pair |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 380 | self.dispatch(k) |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 381 | self.write(": ") |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 382 | self.dispatch(v) |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 383 | interleave(lambda: self.write(", "), write_pair, zip(t.keys, t.values)) |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 384 | self.write("}") |
| 385 | |
| 386 | def _Tuple(self, t): |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 387 | self.write("(") |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 388 | if len(t.elts) == 1: |
| 389 | (elt,) = t.elts |
| 390 | self.dispatch(elt) |
| 391 | self.write(",") |
| 392 | else: |
| 393 | interleave(lambda: self.write(", "), self.dispatch, t.elts) |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 394 | self.write(")") |
| 395 | |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 396 | unop = {"Invert":"~", "Not": "not", "UAdd":"+", "USub":"-"} |
| 397 | def _UnaryOp(self, t): |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 398 | self.write("(") |
Mark Dickinson | ae10005 | 2010-06-28 19:44:20 +0000 | [diff] [blame] | 399 | self.write(self.unop[t.op.__class__.__name__]) |
| 400 | self.write(" ") |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 401 | self.dispatch(t.operand) |
| 402 | self.write(")") |
| 403 | |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 404 | binop = { "Add":"+", "Sub":"-", "Mult":"*", "Div":"/", "Mod":"%", |
Mark Dickinson | ae10005 | 2010-06-28 19:44:20 +0000 | [diff] [blame] | 405 | "LShift":"<<", "RShift":">>", "BitOr":"|", "BitXor":"^", "BitAnd":"&", |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 406 | "FloorDiv":"//", "Pow": "**"} |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 407 | def _BinOp(self, t): |
| 408 | self.write("(") |
| 409 | self.dispatch(t.left) |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 410 | self.write(" " + self.binop[t.op.__class__.__name__] + " ") |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 411 | self.dispatch(t.right) |
| 412 | self.write(")") |
| 413 | |
| 414 | cmpops = {"Eq":"==", "NotEq":"!=", "Lt":"<", "LtE":"<=", "Gt":">", "GtE":">=", |
| 415 | "Is":"is", "IsNot":"is not", "In":"in", "NotIn":"not in"} |
| 416 | def _Compare(self, t): |
| 417 | self.write("(") |
| 418 | self.dispatch(t.left) |
| 419 | for o, e in zip(t.ops, t.comparators): |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 420 | self.write(" " + self.cmpops[o.__class__.__name__] + " ") |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 421 | self.dispatch(e) |
Mark Dickinson | f5451e5 | 2010-06-28 20:09:18 +0000 | [diff] [blame] | 422 | self.write(")") |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 423 | |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 424 | boolops = {ast.And: 'and', ast.Or: 'or'} |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 425 | def _BoolOp(self, t): |
| 426 | self.write("(") |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 427 | s = " %s " % self.boolops[t.op.__class__] |
| 428 | interleave(lambda: self.write(s), self.dispatch, t.values) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 429 | self.write(")") |
| 430 | |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 431 | def _Attribute(self,t): |
| 432 | self.dispatch(t.value) |
Mark Dickinson | b67e15c | 2010-06-30 09:05:47 +0000 | [diff] [blame] | 433 | # Special case: 3.__abs__() is a syntax error, so if t.value |
| 434 | # is an integer literal then we need to either parenthesize |
| 435 | # it or add an extra space to get 3 .__abs__(). |
| 436 | if isinstance(t.value, ast.Num) and isinstance(t.value.n, int): |
| 437 | self.write(" ") |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 438 | self.write(".") |
| 439 | self.write(t.attr) |
| 440 | |
| 441 | def _Call(self, t): |
| 442 | self.dispatch(t.func) |
| 443 | self.write("(") |
| 444 | comma = False |
| 445 | for e in t.args: |
| 446 | if comma: self.write(", ") |
| 447 | else: comma = True |
| 448 | self.dispatch(e) |
| 449 | for e in t.keywords: |
| 450 | if comma: self.write(", ") |
| 451 | else: comma = True |
| 452 | self.dispatch(e) |
| 453 | if t.starargs: |
| 454 | if comma: self.write(", ") |
| 455 | else: comma = True |
| 456 | self.write("*") |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 457 | self.dispatch(t.starargs) |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 458 | if t.kwargs: |
| 459 | if comma: self.write(", ") |
| 460 | else: comma = True |
| 461 | self.write("**") |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 462 | self.dispatch(t.kwargs) |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 463 | self.write(")") |
| 464 | |
| 465 | def _Subscript(self, t): |
| 466 | self.dispatch(t.value) |
| 467 | self.write("[") |
| 468 | self.dispatch(t.slice) |
| 469 | self.write("]") |
| 470 | |
Mark Dickinson | 1b2e944 | 2012-05-06 17:27:39 +0100 | [diff] [blame] | 471 | def _Starred(self, t): |
| 472 | self.write("*") |
| 473 | self.dispatch(t.value) |
| 474 | |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 475 | # slice |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 476 | def _Ellipsis(self, t): |
| 477 | self.write("...") |
| 478 | |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 479 | def _Index(self, t): |
| 480 | self.dispatch(t.value) |
| 481 | |
| 482 | def _Slice(self, t): |
| 483 | if t.lower: |
| 484 | self.dispatch(t.lower) |
| 485 | self.write(":") |
| 486 | if t.upper: |
| 487 | self.dispatch(t.upper) |
| 488 | if t.step: |
| 489 | self.write(":") |
| 490 | self.dispatch(t.step) |
| 491 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 492 | def _ExtSlice(self, t): |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 493 | interleave(lambda: self.write(', '), self.dispatch, t.dims) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 494 | |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 495 | # argument |
| 496 | def _arg(self, t): |
| 497 | self.write(t.arg) |
| 498 | if t.annotation: |
| 499 | self.write(": ") |
| 500 | self.dispatch(t.annotation) |
| 501 | |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 502 | # others |
| 503 | def _arguments(self, t): |
| 504 | first = True |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 505 | # normal arguments |
| 506 | defaults = [None] * (len(t.args) - len(t.defaults)) + t.defaults |
| 507 | for a, d in zip(t.args, defaults): |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 508 | if first:first = False |
| 509 | else: self.write(", ") |
| 510 | self.dispatch(a) |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 511 | if d: |
| 512 | self.write("=") |
| 513 | self.dispatch(d) |
| 514 | |
| 515 | # varargs, or bare '*' if no varargs but keyword-only arguments present |
| 516 | if t.vararg or t.kwonlyargs: |
Martin v. Löwis | 87a8b4f | 2006-02-28 21:41:30 +0000 | [diff] [blame] | 517 | if first:first = False |
| 518 | else: self.write(", ") |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 519 | self.write("*") |
| 520 | if t.vararg: |
| 521 | self.write(t.vararg) |
| 522 | if t.varargannotation: |
| 523 | self.write(": ") |
| 524 | self.dispatch(t.varargannotation) |
| 525 | |
| 526 | # keyword-only arguments |
| 527 | if t.kwonlyargs: |
| 528 | for a, d in zip(t.kwonlyargs, t.kw_defaults): |
| 529 | if first:first = False |
| 530 | else: self.write(", ") |
| 531 | self.dispatch(a), |
| 532 | if d: |
| 533 | self.write("=") |
| 534 | self.dispatch(d) |
| 535 | |
| 536 | # kwargs |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 537 | if t.kwarg: |
| 538 | if first:first = False |
| 539 | else: self.write(", ") |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 540 | self.write("**"+t.kwarg) |
Mark Dickinson | fa2e4e9 | 2010-06-28 21:14:17 +0000 | [diff] [blame] | 541 | if t.kwargannotation: |
| 542 | self.write(": ") |
| 543 | self.dispatch(t.kwargannotation) |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 544 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 545 | def _keyword(self, t): |
| 546 | self.write(t.arg) |
| 547 | self.write("=") |
| 548 | self.dispatch(t.value) |
| 549 | |
| 550 | def _Lambda(self, t): |
Mark Dickinson | 8042e28 | 2010-06-29 10:01:48 +0000 | [diff] [blame] | 551 | self.write("(") |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 552 | self.write("lambda ") |
| 553 | self.dispatch(t.args) |
| 554 | self.write(": ") |
| 555 | self.dispatch(t.body) |
Mark Dickinson | 8042e28 | 2010-06-29 10:01:48 +0000 | [diff] [blame] | 556 | self.write(")") |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 557 | |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 558 | def _alias(self, t): |
| 559 | self.write(t.name) |
| 560 | if t.asname: |
| 561 | self.write(" as "+t.asname) |
| 562 | |
Mark Dickinson | fe8440a | 2012-05-06 17:35:19 +0100 | [diff] [blame] | 563 | def _withitem(self, t): |
| 564 | self.dispatch(t.context_expr) |
| 565 | if t.optional_vars: |
| 566 | self.write(" as ") |
| 567 | self.dispatch(t.optional_vars) |
| 568 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 569 | def roundtrip(filename, output=sys.stdout): |
Mark Dickinson | 82c8d93 | 2010-06-29 07:48:23 +0000 | [diff] [blame] | 570 | with open(filename, "rb") as pyfile: |
| 571 | encoding = tokenize.detect_encoding(pyfile.readline)[0] |
| 572 | with open(filename, "r", encoding=encoding) as pyfile: |
| 573 | source = pyfile.read() |
Mark Dickinson | 3d1bfbf | 2010-06-28 21:39:51 +0000 | [diff] [blame] | 574 | tree = compile(source, filename, "exec", ast.PyCF_ONLY_AST) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 575 | Unparser(tree, output) |
| 576 | |
| 577 | |
| 578 | |
| 579 | def testdir(a): |
| 580 | try: |
| 581 | names = [n for n in os.listdir(a) if n.endswith('.py')] |
| 582 | except OSError: |
Collin Winter | 6f2df4d | 2007-07-17 20:59:35 +0000 | [diff] [blame] | 583 | print("Directory not readable: %s" % a, file=sys.stderr) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 584 | else: |
| 585 | for n in names: |
| 586 | fullname = os.path.join(a, n) |
| 587 | if os.path.isfile(fullname): |
Collin Winter | 6f2df4d | 2007-07-17 20:59:35 +0000 | [diff] [blame] | 588 | output = io.StringIO() |
| 589 | print('Testing %s' % fullname) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 590 | try: |
| 591 | roundtrip(fullname, output) |
Guido van Rossum | b940e11 | 2007-01-10 16:19:56 +0000 | [diff] [blame] | 592 | except Exception as e: |
Collin Winter | 6f2df4d | 2007-07-17 20:59:35 +0000 | [diff] [blame] | 593 | print(' Failed to compile, exception is %s' % repr(e)) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 594 | elif os.path.isdir(fullname): |
| 595 | testdir(fullname) |
| 596 | |
| 597 | def main(args): |
| 598 | if args[0] == '--testdir': |
| 599 | for a in args[1:]: |
| 600 | testdir(a) |
| 601 | else: |
| 602 | for a in args: |
| 603 | roundtrip(a) |
Tim Peters | 400cbc3 | 2006-02-28 18:44:41 +0000 | [diff] [blame] | 604 | |
| 605 | if __name__=='__main__': |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 606 | main(sys.argv[1:]) |