Guido van Rossum | 95e4d58 | 2018-01-26 08:20:18 -0800 | [diff] [blame] | 1 | #include <stdbool.h> |
| 2 | #include "Python.h" |
| 3 | #include "Python-ast.h" |
| 4 | |
| 5 | static PyObject *_str_open_br; |
| 6 | static PyObject *_str_dbl_open_br; |
| 7 | static PyObject *_str_close_br; |
| 8 | static PyObject *_str_dbl_close_br; |
| 9 | |
| 10 | /* Forward declarations for recursion via helper functions. */ |
| 11 | static PyObject * |
| 12 | expr_as_unicode(expr_ty e, bool omit_parens); |
| 13 | static int |
| 14 | append_ast_expr(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens); |
| 15 | static int |
| 16 | append_joinedstr(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec); |
| 17 | static int |
| 18 | append_formattedvalue(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec); |
| 19 | |
| 20 | static int |
| 21 | append_charp(_PyUnicodeWriter *writer, const char *charp) |
| 22 | { |
Stéphane Wirtel | 83ab995 | 2018-02-01 17:59:27 +0100 | [diff] [blame^] | 23 | return _PyUnicodeWriter_WriteASCIIString(writer, charp, -1); |
Guido van Rossum | 95e4d58 | 2018-01-26 08:20:18 -0800 | [diff] [blame] | 24 | } |
| 25 | |
| 26 | static int |
| 27 | append_repr(_PyUnicodeWriter *writer, PyObject *obj) |
| 28 | { |
| 29 | int ret; |
| 30 | PyObject *repr; |
| 31 | repr = PyObject_Repr(obj); |
| 32 | if (!repr) { |
| 33 | return -1; |
| 34 | } |
| 35 | ret = _PyUnicodeWriter_WriteStr(writer, repr); |
| 36 | Py_DECREF(repr); |
| 37 | return ret; |
| 38 | } |
| 39 | |
| 40 | static int |
| 41 | append_ast_boolop(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens) |
| 42 | { |
| 43 | Py_ssize_t i, value_count; |
| 44 | asdl_seq *values; |
| 45 | |
| 46 | if (!omit_parens && -1 == append_charp(writer, "(")) { |
| 47 | return -1; |
| 48 | } |
| 49 | |
| 50 | values = e->v.BoolOp.values; |
| 51 | value_count = asdl_seq_LEN(values) - 1; |
| 52 | assert(value_count >= 0); |
| 53 | |
| 54 | if (-1 == append_ast_expr(writer, |
| 55 | (expr_ty)asdl_seq_GET(values, 0), |
| 56 | false)) { |
| 57 | return -1; |
| 58 | } |
| 59 | |
| 60 | const char *op = (e->v.BoolOp.op == And) ? " and " : " or "; |
| 61 | for (i = 1; i <= value_count; ++i) { |
| 62 | if (-1 == append_charp(writer, op)) { |
| 63 | return -1; |
| 64 | } |
| 65 | |
| 66 | if (-1 == append_ast_expr(writer, |
| 67 | (expr_ty)asdl_seq_GET(values, i), |
| 68 | false)) { |
| 69 | return -1; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | return omit_parens ? 0 : append_charp(writer, ")"); |
| 74 | } |
| 75 | |
| 76 | static int |
| 77 | append_ast_binop(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens) |
| 78 | { |
| 79 | const char *op; |
| 80 | |
| 81 | if (!omit_parens && -1 == append_charp(writer, "(")) { |
| 82 | return -1; |
| 83 | } |
| 84 | |
| 85 | if (-1 == append_ast_expr(writer, e->v.BinOp.left, false)) { |
| 86 | return -1; |
| 87 | } |
| 88 | |
| 89 | switch(e->v.BinOp.op) { |
| 90 | case Add: op = " + "; break; |
| 91 | case Sub: op = " - "; break; |
| 92 | case Mult: op = " * "; break; |
| 93 | case MatMult: op = " @ "; break; |
| 94 | case Div: op = " / "; break; |
| 95 | case Mod: op = " % "; break; |
| 96 | case LShift: op = " << "; break; |
| 97 | case RShift: op = " >> "; break; |
| 98 | case BitOr: op = " | "; break; |
| 99 | case BitXor: op = " ^ "; break; |
| 100 | case BitAnd: op = " & "; break; |
| 101 | case FloorDiv: op = " // "; break; |
| 102 | case Pow: op = " ** "; break; |
Stéphane Wirtel | 83ab995 | 2018-02-01 17:59:27 +0100 | [diff] [blame^] | 103 | default: |
| 104 | Py_UNREACHABLE(); |
Guido van Rossum | 95e4d58 | 2018-01-26 08:20:18 -0800 | [diff] [blame] | 105 | } |
| 106 | |
| 107 | if (-1 == append_charp(writer, op)) { |
| 108 | return -1; |
| 109 | } |
| 110 | |
| 111 | if (-1 == append_ast_expr(writer, e->v.BinOp.right, false)) { |
| 112 | return -1; |
| 113 | } |
| 114 | |
| 115 | return omit_parens ? 0 : append_charp(writer, ")"); |
| 116 | } |
| 117 | |
| 118 | static int |
| 119 | append_ast_unaryop(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens) |
| 120 | { |
| 121 | const char *op; |
| 122 | |
| 123 | if (!omit_parens && -1 == append_charp(writer, "(")) { |
| 124 | return -1; |
| 125 | } |
| 126 | |
| 127 | switch(e->v.UnaryOp.op) { |
| 128 | case Invert: op = "~"; break; |
| 129 | case Not: op = "not "; break; |
| 130 | case UAdd: op = "+"; break; |
| 131 | case USub: op = "-"; break; |
Stéphane Wirtel | 83ab995 | 2018-02-01 17:59:27 +0100 | [diff] [blame^] | 132 | default: |
| 133 | Py_UNREACHABLE(); |
Guido van Rossum | 95e4d58 | 2018-01-26 08:20:18 -0800 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | if (-1 == append_charp(writer, op)) { |
| 137 | return -1; |
| 138 | } |
| 139 | |
| 140 | if (-1 == append_ast_expr(writer, e->v.UnaryOp.operand, false)) { |
| 141 | return -1; |
| 142 | } |
| 143 | |
| 144 | return omit_parens ? 0 : append_charp(writer, ")"); |
| 145 | } |
| 146 | |
| 147 | static int |
| 148 | append_ast_arg(_PyUnicodeWriter *writer, arg_ty arg) |
| 149 | { |
| 150 | if (-1 == _PyUnicodeWriter_WriteStr(writer, arg->arg)) { |
| 151 | return -1; |
| 152 | } |
| 153 | if (arg->annotation) { |
| 154 | if (-1 == append_charp(writer, ": ")) { |
| 155 | return -1; |
| 156 | } |
| 157 | if (-1 == append_ast_expr(writer, arg->annotation, true)) { |
| 158 | return -1; |
| 159 | } |
| 160 | } |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | static int |
| 165 | append_ast_args(_PyUnicodeWriter *writer, arguments_ty args) |
| 166 | { |
| 167 | bool first; |
| 168 | Py_ssize_t i, di, arg_count, default_count; |
| 169 | arg_ty arg; |
| 170 | expr_ty default_; |
| 171 | |
| 172 | first = true; |
| 173 | |
| 174 | /* positional arguments with defaults */ |
| 175 | arg_count = asdl_seq_LEN(args->args); |
| 176 | default_count = asdl_seq_LEN(args->defaults); |
| 177 | for (i = 0; i < arg_count; i++) { |
| 178 | if (first) { |
| 179 | first = false; |
| 180 | } |
| 181 | else if (-1 == append_charp(writer, ", ")) { |
| 182 | return -1; |
| 183 | } |
| 184 | |
| 185 | arg = (arg_ty)asdl_seq_GET(args->args, i); |
| 186 | if (-1 == append_ast_arg(writer, arg)) { |
| 187 | return -1; |
| 188 | } |
| 189 | |
| 190 | di = i - arg_count + default_count; |
| 191 | if (di >= 0) { |
| 192 | if (-1 == append_charp(writer, "=")) { |
| 193 | return -1; |
| 194 | } |
| 195 | default_ = (expr_ty)asdl_seq_GET(args->defaults, di); |
| 196 | if (-1 == append_ast_expr(writer, default_, false)) { |
| 197 | return -1; |
| 198 | } |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | /* vararg, or bare '*' if no varargs but keyword-only arguments present */ |
| 203 | if (args->vararg || args->kwonlyargs) { |
| 204 | if (first) { |
| 205 | first = false; |
| 206 | } |
| 207 | else if (-1 == append_charp(writer, ", ")) { |
| 208 | return -1; |
| 209 | } |
| 210 | |
| 211 | if (-1 == append_charp(writer, "*")) { |
| 212 | return -1; |
| 213 | } |
| 214 | |
| 215 | if (args->vararg) { |
| 216 | if (-1 == append_ast_arg(writer, args->vararg)) { |
| 217 | return -1; |
| 218 | } |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | /* keyword-only arguments */ |
| 223 | arg_count = asdl_seq_LEN(args->kwonlyargs); |
| 224 | default_count = asdl_seq_LEN(args->kw_defaults); |
| 225 | for (i = 0; i < arg_count; i++) { |
| 226 | if (first) { |
| 227 | first = false; |
| 228 | } |
| 229 | else if (-1 == append_charp(writer, ", ")) { |
| 230 | return -1; |
| 231 | } |
| 232 | |
| 233 | arg = (arg_ty)asdl_seq_GET(args->kwonlyargs, i); |
| 234 | if (-1 == append_ast_arg(writer, arg)) { |
| 235 | return -1; |
| 236 | } |
| 237 | |
| 238 | di = i - arg_count + default_count; |
| 239 | if (di >= 0) { |
| 240 | if (-1 == append_charp(writer, "=")) { |
| 241 | return -1; |
| 242 | } |
| 243 | default_ = (expr_ty)asdl_seq_GET(args->kw_defaults, di); |
| 244 | if (-1 == append_ast_expr(writer, default_, false)) { |
| 245 | return -1; |
| 246 | } |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | /* **kwargs */ |
| 251 | if (args->kwarg) { |
| 252 | if (first) { |
| 253 | first = false; |
| 254 | } |
| 255 | else if (-1 == append_charp(writer, ", ")) { |
| 256 | return -1; |
| 257 | } |
| 258 | |
| 259 | if (-1 == append_charp(writer, "**")) { |
| 260 | return -1; |
| 261 | } |
| 262 | |
| 263 | if (-1 == append_ast_arg(writer, args->kwarg)) { |
| 264 | return -1; |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | return 0; |
| 269 | } |
| 270 | |
| 271 | static int |
| 272 | append_ast_lambda(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens) |
| 273 | { |
| 274 | if (!omit_parens && -1 == append_charp(writer, "(")) { |
| 275 | return -1; |
| 276 | } |
| 277 | |
| 278 | if (-1 == append_charp(writer, "lambda ")) { |
| 279 | return -1; |
| 280 | } |
| 281 | |
| 282 | if (-1 == append_ast_args(writer, e->v.Lambda.args)) { |
| 283 | return -1; |
| 284 | } |
| 285 | |
| 286 | if (-1 == append_charp(writer, ": ")) { |
| 287 | return -1; |
| 288 | } |
| 289 | |
| 290 | if (-1 == append_ast_expr(writer, e->v.Lambda.body, true)) { |
| 291 | return -1; |
| 292 | } |
| 293 | |
| 294 | return omit_parens ? 0 : append_charp(writer, ")"); |
| 295 | } |
| 296 | |
| 297 | static int |
| 298 | append_ast_ifexp(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens) |
| 299 | { |
| 300 | if (!omit_parens && -1 == append_charp(writer, "(")) { |
| 301 | return -1; |
| 302 | } |
| 303 | |
| 304 | if (-1 == append_ast_expr(writer, e->v.IfExp.body, false)) { |
| 305 | return -1; |
| 306 | } |
| 307 | |
| 308 | if (-1 == append_charp(writer, " if ")) { |
| 309 | return -1; |
| 310 | } |
| 311 | |
| 312 | if (-1 == append_ast_expr(writer, e->v.IfExp.test, false)) { |
| 313 | return -1; |
| 314 | } |
| 315 | |
| 316 | if (-1 == append_charp(writer, " else ")) { |
| 317 | return -1; |
| 318 | } |
| 319 | |
| 320 | if (-1 == append_ast_expr(writer, e->v.IfExp.orelse, false)) { |
| 321 | return -1; |
| 322 | } |
| 323 | |
| 324 | return omit_parens ? 0 : append_charp(writer, ")"); |
| 325 | } |
| 326 | |
| 327 | static int |
| 328 | append_ast_dict(_PyUnicodeWriter *writer, expr_ty e) |
| 329 | { |
| 330 | Py_ssize_t i, value_count; |
| 331 | expr_ty key_node, value_node; |
| 332 | |
| 333 | if (-1 == append_charp(writer, "{")) { |
| 334 | return -1; |
| 335 | } |
| 336 | |
| 337 | value_count = asdl_seq_LEN(e->v.Dict.values); |
| 338 | |
| 339 | for (i = 0; i < value_count; i++) { |
| 340 | if (i > 0 && -1 == append_charp(writer, ", ")) { |
| 341 | return -1; |
| 342 | } |
| 343 | key_node = (expr_ty)asdl_seq_GET(e->v.Dict.keys, i); |
| 344 | if (key_node != NULL) { |
| 345 | if (-1 == append_ast_expr(writer, key_node, false)) { |
| 346 | return -1; |
| 347 | } |
| 348 | |
| 349 | if (-1 == append_charp(writer, ": ")) { |
| 350 | return -1; |
| 351 | } |
| 352 | } |
| 353 | else if (-1 == append_charp(writer, "**")) { |
| 354 | return -1; |
| 355 | } |
| 356 | |
| 357 | value_node = (expr_ty)asdl_seq_GET(e->v.Dict.values, i); |
| 358 | if (-1 == append_ast_expr(writer, value_node, false)) { |
| 359 | return -1; |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | return append_charp(writer, "}"); |
| 364 | } |
| 365 | |
| 366 | static int |
| 367 | append_ast_set(_PyUnicodeWriter *writer, expr_ty e) |
| 368 | { |
| 369 | Py_ssize_t i, elem_count; |
| 370 | expr_ty elem_node; |
| 371 | |
| 372 | if (-1 == append_charp(writer, "{")) { |
| 373 | return -1; |
| 374 | } |
| 375 | |
| 376 | elem_count = asdl_seq_LEN(e->v.Set.elts); |
| 377 | for (i = 0; i < elem_count; i++) { |
| 378 | if (i > 0 && -1 == append_charp(writer, ", ")) { |
| 379 | return -1; |
| 380 | } |
| 381 | |
| 382 | elem_node = (expr_ty)asdl_seq_GET(e->v.Set.elts, i); |
| 383 | if (-1 == append_ast_expr(writer, elem_node, false)) { |
| 384 | return -1; |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | return append_charp(writer, "}"); |
| 389 | } |
| 390 | |
| 391 | static int |
| 392 | append_ast_list(_PyUnicodeWriter *writer, expr_ty e) |
| 393 | { |
| 394 | Py_ssize_t i, elem_count; |
| 395 | expr_ty elem_node; |
| 396 | |
| 397 | if (-1 == append_charp(writer, "[")) { |
| 398 | return -1; |
| 399 | } |
| 400 | |
| 401 | elem_count = asdl_seq_LEN(e->v.List.elts); |
| 402 | for (i = 0; i < elem_count; i++) { |
| 403 | if (i > 0 && -1 == append_charp(writer, ", ")) { |
| 404 | return -1; |
| 405 | } |
| 406 | elem_node = (expr_ty)asdl_seq_GET(e->v.List.elts, i); |
| 407 | if (-1 == append_ast_expr(writer, elem_node, false)) { |
| 408 | return -1; |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | return append_charp(writer, "]"); |
| 413 | } |
| 414 | |
| 415 | static int |
| 416 | append_ast_tuple(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens) |
| 417 | { |
| 418 | Py_ssize_t i, elem_count; |
| 419 | expr_ty elem_node; |
| 420 | |
| 421 | elem_count = asdl_seq_LEN(e->v.Tuple.elts); |
| 422 | |
| 423 | if (!omit_parens || elem_count < 2) { |
| 424 | if (-1 == append_charp(writer, "(")) { |
| 425 | return -1; |
| 426 | } |
| 427 | } |
| 428 | |
| 429 | for (i = 0; i < elem_count; i++) { |
| 430 | if ((i > 0 || elem_count == 1) && -1 == append_charp(writer, ", ")) { |
| 431 | return -1; |
| 432 | } |
| 433 | elem_node = (expr_ty)asdl_seq_GET(e->v.Tuple.elts, i); |
| 434 | if (-1 == append_ast_expr(writer, elem_node, false)) { |
| 435 | return -1; |
| 436 | } |
| 437 | } |
| 438 | |
| 439 | if (!omit_parens || elem_count < 2) { |
| 440 | return append_charp(writer, ")"); |
| 441 | } |
| 442 | |
| 443 | return 0; |
| 444 | } |
| 445 | |
| 446 | static int |
| 447 | append_ast_comprehension(_PyUnicodeWriter *writer, comprehension_ty gen) |
| 448 | { |
| 449 | Py_ssize_t i, if_count; |
| 450 | |
| 451 | if (-1 == append_charp(writer, gen->is_async ? " async for " : " for ")) { |
| 452 | return -1; |
| 453 | } |
| 454 | |
| 455 | if (-1 == append_ast_expr(writer, gen->target, true)) { |
| 456 | return -1; |
| 457 | } |
| 458 | |
| 459 | if (-1 == append_charp(writer, " in ")) { |
| 460 | return -1; |
| 461 | } |
| 462 | |
| 463 | if (-1 == append_ast_expr(writer, gen->iter, false)) { |
| 464 | return -1; |
| 465 | } |
| 466 | |
| 467 | if_count = asdl_seq_LEN(gen->ifs); |
| 468 | for (i = 0; i < if_count; i++) { |
| 469 | if (-1 == append_charp(writer, " if ")) { |
| 470 | return -1; |
| 471 | } |
| 472 | |
| 473 | if (-1 == append_ast_expr(writer, |
| 474 | (expr_ty)asdl_seq_GET(gen->ifs, i), |
| 475 | false)) { |
| 476 | return -1; |
| 477 | } |
| 478 | } |
| 479 | return 0; |
| 480 | } |
| 481 | |
| 482 | static int |
| 483 | append_ast_comprehensions(_PyUnicodeWriter *writer, asdl_seq *comprehensions) |
| 484 | { |
| 485 | Py_ssize_t i, gen_count; |
| 486 | comprehension_ty comp_node; |
| 487 | gen_count = asdl_seq_LEN(comprehensions); |
| 488 | |
| 489 | for (i = 0; i < gen_count; i++) { |
| 490 | comp_node = (comprehension_ty)asdl_seq_GET(comprehensions, i); |
| 491 | if (-1 == append_ast_comprehension(writer, comp_node)) { |
| 492 | return -1; |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | return 0; |
| 497 | } |
| 498 | |
| 499 | static int |
| 500 | append_ast_genexp(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens) |
| 501 | { |
| 502 | if (!omit_parens && -1 == append_charp(writer, "(")) { |
| 503 | return -1; |
| 504 | } |
| 505 | |
| 506 | if (-1 == append_ast_expr(writer, e->v.GeneratorExp.elt, false)) { |
| 507 | return -1; |
| 508 | } |
| 509 | |
| 510 | if (-1 == append_ast_comprehensions(writer, e->v.GeneratorExp.generators)) { |
| 511 | return -1; |
| 512 | } |
| 513 | |
| 514 | return omit_parens ? 0 : append_charp(writer, ")"); |
| 515 | } |
| 516 | |
| 517 | static int |
| 518 | append_ast_listcomp(_PyUnicodeWriter *writer, expr_ty e) |
| 519 | { |
| 520 | if (-1 == append_charp(writer, "[")) { |
| 521 | return -1; |
| 522 | } |
| 523 | |
| 524 | if (-1 == append_ast_expr(writer, e->v.ListComp.elt, false)) { |
| 525 | return -1; |
| 526 | } |
| 527 | |
| 528 | if (-1 == append_ast_comprehensions(writer, e->v.ListComp.generators)) { |
| 529 | return -1; |
| 530 | } |
| 531 | |
| 532 | return append_charp(writer, "]"); |
| 533 | } |
| 534 | |
| 535 | static int |
| 536 | append_ast_setcomp(_PyUnicodeWriter *writer, expr_ty e) |
| 537 | { |
| 538 | if (-1 == append_charp(writer, "{")) { |
| 539 | return -1; |
| 540 | } |
| 541 | |
| 542 | if (-1 == append_ast_expr(writer, e->v.SetComp.elt, false)) { |
| 543 | return -1; |
| 544 | } |
| 545 | |
| 546 | if (-1 == append_ast_comprehensions(writer, e->v.SetComp.generators)) { |
| 547 | return -1; |
| 548 | } |
| 549 | |
| 550 | return append_charp(writer, "}"); |
| 551 | } |
| 552 | |
| 553 | static int |
| 554 | append_ast_dictcomp(_PyUnicodeWriter *writer, expr_ty e) |
| 555 | { |
| 556 | if (-1 == append_charp(writer, "{")) { |
| 557 | return -1; |
| 558 | } |
| 559 | |
| 560 | if (-1 == append_ast_expr(writer, e->v.DictComp.key, false)) { |
| 561 | return -1; |
| 562 | } |
| 563 | |
| 564 | if (-1 == append_charp(writer, ": ")) { |
| 565 | return -1; |
| 566 | } |
| 567 | |
| 568 | if (-1 == append_ast_expr(writer, e->v.DictComp.value, false)) { |
| 569 | return -1; |
| 570 | } |
| 571 | |
| 572 | if (-1 == append_ast_comprehensions(writer, e->v.DictComp.generators)) { |
| 573 | return -1; |
| 574 | } |
| 575 | |
| 576 | return append_charp(writer, "}"); |
| 577 | } |
| 578 | |
| 579 | static int |
| 580 | append_ast_compare(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens) |
| 581 | { |
| 582 | const char *op; |
| 583 | Py_ssize_t i, comparator_count; |
| 584 | asdl_seq *comparators; |
| 585 | asdl_int_seq *ops; |
| 586 | |
| 587 | if (!omit_parens && -1 == append_charp(writer, "(")) { |
| 588 | return -1; |
| 589 | } |
| 590 | |
| 591 | comparators = e->v.Compare.comparators; |
| 592 | ops = e->v.Compare.ops; |
| 593 | comparator_count = asdl_seq_LEN(comparators); |
| 594 | assert(comparator_count > 0); |
| 595 | assert(comparator_count == asdl_seq_LEN(ops)); |
| 596 | |
| 597 | if (-1 == append_ast_expr(writer, e->v.Compare.left, false)) { |
| 598 | return -1; |
| 599 | } |
| 600 | |
| 601 | for (i = 0; i < comparator_count; i++) { |
| 602 | switch ((cmpop_ty)asdl_seq_GET(ops, i)) { |
| 603 | case Eq: |
| 604 | op = " == "; |
| 605 | break; |
| 606 | case NotEq: |
| 607 | op = " != "; |
| 608 | break; |
| 609 | case Lt: |
| 610 | op = " < "; |
| 611 | break; |
| 612 | case LtE: |
| 613 | op = " <= "; |
| 614 | break; |
| 615 | case Gt: |
| 616 | op = " > "; |
| 617 | break; |
| 618 | case GtE: |
| 619 | op = " >= "; |
| 620 | break; |
| 621 | case Is: |
| 622 | op = " is "; |
| 623 | break; |
| 624 | case IsNot: |
| 625 | op = " is not "; |
| 626 | break; |
| 627 | case In: |
| 628 | op = " in "; |
| 629 | break; |
| 630 | case NotIn: |
| 631 | op = " not in "; |
| 632 | break; |
| 633 | default: |
| 634 | PyErr_SetString(PyExc_SystemError, |
| 635 | "unexpected comparison kind"); |
| 636 | return -1; |
| 637 | } |
| 638 | |
| 639 | if (-1 == append_charp(writer, op)) { |
| 640 | return -1; |
| 641 | } |
| 642 | |
| 643 | if (-1 == append_ast_expr(writer, |
| 644 | (expr_ty)asdl_seq_GET(comparators, i), |
| 645 | false)) { |
| 646 | return -1; |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | return omit_parens ? 0 : append_charp(writer, ")"); |
| 651 | } |
| 652 | |
| 653 | static int |
| 654 | append_ast_keyword(_PyUnicodeWriter *writer, keyword_ty kw) |
| 655 | { |
| 656 | if (kw->arg == NULL) { |
| 657 | if (-1 == append_charp(writer, "**")) { |
| 658 | return -1; |
| 659 | } |
| 660 | } |
| 661 | else { |
| 662 | if (-1 == _PyUnicodeWriter_WriteStr(writer, kw->arg)) { |
| 663 | return -1; |
| 664 | } |
| 665 | |
| 666 | if (-1 == append_charp(writer, "=")) { |
| 667 | return -1; |
| 668 | } |
| 669 | } |
| 670 | |
| 671 | return append_ast_expr(writer, kw->value, false); |
| 672 | } |
| 673 | |
| 674 | static int |
| 675 | append_ast_call(_PyUnicodeWriter *writer, expr_ty e) |
| 676 | { |
| 677 | bool first; |
| 678 | Py_ssize_t i, arg_count, kw_count; |
| 679 | expr_ty expr; |
| 680 | keyword_ty kw; |
| 681 | |
| 682 | if (-1 == append_ast_expr(writer, e->v.Call.func, false)) { |
| 683 | return -1; |
| 684 | } |
| 685 | |
| 686 | if (-1 == append_charp(writer, "(")) { |
| 687 | return -1; |
| 688 | } |
| 689 | |
| 690 | first = true; |
| 691 | arg_count = asdl_seq_LEN(e->v.Call.args); |
| 692 | for (i = 0; i < arg_count; i++) { |
| 693 | if (first) { |
| 694 | first = false; |
| 695 | } |
| 696 | else if (-1 == append_charp(writer, ", ")) { |
| 697 | return -1; |
| 698 | } |
| 699 | |
| 700 | expr = (expr_ty)asdl_seq_GET(e->v.Call.args, i); |
| 701 | if (-1 == append_ast_expr(writer, expr, false)) { |
| 702 | return -1; |
| 703 | } |
| 704 | } |
| 705 | |
| 706 | kw_count = asdl_seq_LEN(e->v.Call.keywords); |
| 707 | for (i = 0; i < kw_count; i++) { |
| 708 | if (first) { |
| 709 | first = false; |
| 710 | } |
| 711 | else if (-1 == append_charp(writer, ", ")) { |
| 712 | return -1; |
| 713 | } |
| 714 | |
| 715 | kw = (keyword_ty)asdl_seq_GET(e->v.Call.keywords, i); |
| 716 | if (-1 == append_ast_keyword(writer, kw)) { |
| 717 | return -1; |
| 718 | } |
| 719 | } |
| 720 | |
| 721 | return append_charp(writer, ")"); |
| 722 | } |
| 723 | |
| 724 | static PyObject * |
| 725 | escape_braces(PyObject *orig) |
| 726 | { |
| 727 | PyObject *temp; |
| 728 | PyObject *result; |
| 729 | temp = PyUnicode_Replace(orig, _str_open_br, _str_dbl_open_br, -1); |
| 730 | if (!temp) { |
| 731 | return NULL; |
| 732 | } |
| 733 | result = PyUnicode_Replace(temp, _str_close_br, _str_dbl_close_br, -1); |
| 734 | Py_DECREF(temp); |
| 735 | return result; |
| 736 | } |
| 737 | |
| 738 | static int |
| 739 | append_fstring_unicode(_PyUnicodeWriter *writer, PyObject *unicode) |
| 740 | { |
| 741 | PyObject *escaped; |
| 742 | int result = -1; |
| 743 | escaped = escape_braces(unicode); |
| 744 | if (escaped) { |
| 745 | result = _PyUnicodeWriter_WriteStr(writer, escaped); |
| 746 | Py_DECREF(escaped); |
| 747 | } |
| 748 | return result; |
| 749 | } |
| 750 | |
| 751 | static int |
| 752 | append_fstring_element(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec) |
| 753 | { |
| 754 | switch (e->kind) { |
| 755 | case Constant_kind: |
| 756 | return append_fstring_unicode(writer, e->v.Constant.value); |
| 757 | case Str_kind: |
| 758 | return append_fstring_unicode(writer, e->v.Str.s); |
| 759 | case JoinedStr_kind: |
| 760 | return append_joinedstr(writer, e, is_format_spec); |
| 761 | case FormattedValue_kind: |
| 762 | return append_formattedvalue(writer, e, is_format_spec); |
| 763 | default: |
| 764 | PyErr_SetString(PyExc_SystemError, |
| 765 | "unknown expression kind inside f-string"); |
| 766 | return -1; |
| 767 | } |
| 768 | } |
| 769 | |
| 770 | /* Build body separately to enable wrapping the entire stream of Strs, |
| 771 | Constants and FormattedValues in one opening and one closing quote. */ |
| 772 | static PyObject * |
| 773 | build_fstring_body(asdl_seq *values, bool is_format_spec) |
| 774 | { |
| 775 | Py_ssize_t i, value_count; |
| 776 | _PyUnicodeWriter body_writer; |
| 777 | _PyUnicodeWriter_Init(&body_writer); |
| 778 | body_writer.min_length = 256; |
| 779 | body_writer.overallocate = 1; |
| 780 | |
| 781 | value_count = asdl_seq_LEN(values) - 1; |
| 782 | assert(value_count >= 0); |
| 783 | for (i = 0; i <= value_count; ++i) { |
| 784 | if (-1 == append_fstring_element(&body_writer, |
| 785 | (expr_ty)asdl_seq_GET(values, i), |
| 786 | is_format_spec |
| 787 | )) { |
| 788 | _PyUnicodeWriter_Dealloc(&body_writer); |
| 789 | return NULL; |
| 790 | } |
| 791 | } |
| 792 | |
| 793 | return _PyUnicodeWriter_Finish(&body_writer); |
| 794 | } |
| 795 | |
| 796 | static int |
| 797 | append_joinedstr(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec) |
| 798 | { |
| 799 | int result = -1; |
| 800 | PyObject *body = build_fstring_body(e->v.JoinedStr.values, is_format_spec); |
| 801 | if (!body) { |
| 802 | return -1; |
| 803 | } |
| 804 | |
| 805 | if (!is_format_spec) { |
| 806 | if (-1 != append_charp(writer, "f") && |
| 807 | -1 != append_repr(writer, body)) |
| 808 | { |
| 809 | result = 0; |
| 810 | } |
| 811 | } |
| 812 | else { |
| 813 | result = _PyUnicodeWriter_WriteStr(writer, body); |
| 814 | } |
| 815 | Py_DECREF(body); |
| 816 | return result; |
| 817 | } |
| 818 | |
| 819 | static int |
| 820 | append_formattedvalue(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec) |
| 821 | { |
| 822 | char *conversion; |
| 823 | char *outer_brace = "{"; |
| 824 | PyObject *temp_fv_str = expr_as_unicode(e->v.FormattedValue.value, true); |
| 825 | if (!temp_fv_str) { |
| 826 | return -1; |
| 827 | } |
| 828 | if (PyUnicode_Find(temp_fv_str, _str_open_br, 0, 1, 1) == 0) { |
| 829 | /* Expression starts with a brace, split it with a space from the outer |
| 830 | one. */ |
| 831 | outer_brace = "{ "; |
| 832 | } |
| 833 | if (-1 == append_charp(writer, outer_brace)) { |
| 834 | Py_DECREF(temp_fv_str); |
| 835 | return -1; |
| 836 | } |
| 837 | if (-1 == _PyUnicodeWriter_WriteStr(writer, temp_fv_str)) { |
| 838 | Py_DECREF(temp_fv_str); |
| 839 | return -1; |
| 840 | } |
| 841 | Py_DECREF(temp_fv_str); |
| 842 | |
| 843 | if (e->v.FormattedValue.conversion > 0) { |
| 844 | switch (e->v.FormattedValue.conversion) { |
| 845 | case 97: |
| 846 | conversion = "!a"; |
| 847 | break; |
| 848 | case 114: |
| 849 | conversion = "!r"; |
| 850 | break; |
| 851 | case 115: |
| 852 | conversion = "!s"; |
| 853 | break; |
| 854 | default: |
| 855 | PyErr_SetString(PyExc_SystemError, |
| 856 | "unknown f-value conversion kind"); |
| 857 | return -1; |
| 858 | } |
| 859 | if (-1 == append_charp(writer, conversion)) { |
| 860 | return -1; |
| 861 | } |
| 862 | } |
Stéphane Wirtel | 83ab995 | 2018-02-01 17:59:27 +0100 | [diff] [blame^] | 863 | if (e->v.FormattedValue.format_spec) { |
Guido van Rossum | 95e4d58 | 2018-01-26 08:20:18 -0800 | [diff] [blame] | 864 | if (-1 == _PyUnicodeWriter_WriteASCIIString(writer, ":", 1) || |
| 865 | -1 == append_fstring_element(writer, |
| 866 | e->v.FormattedValue.format_spec, |
| 867 | true |
| 868 | )) |
| 869 | { |
| 870 | return -1; |
| 871 | } |
| 872 | } |
| 873 | return append_charp(writer, "}"); |
| 874 | } |
| 875 | |
| 876 | static int |
| 877 | append_ast_attribute(_PyUnicodeWriter *writer, expr_ty e) |
| 878 | { |
| 879 | const char *period; |
| 880 | if (-1 == append_ast_expr(writer, e->v.Attribute.value, false)) { |
| 881 | return -1; |
| 882 | } |
| 883 | |
| 884 | /* Special case: integers require a space for attribute access to be |
| 885 | unambiguous. Floats and complex numbers don't but work with it, too. */ |
| 886 | if (e->v.Attribute.value->kind == Num_kind || |
| 887 | e->v.Attribute.value->kind == Constant_kind) |
| 888 | { |
| 889 | period = " ."; |
| 890 | } |
| 891 | else { |
| 892 | period = "."; |
| 893 | } |
| 894 | if (-1 == append_charp(writer, period)) { |
| 895 | return -1; |
| 896 | } |
| 897 | |
| 898 | return _PyUnicodeWriter_WriteStr(writer, e->v.Attribute.attr); |
| 899 | } |
| 900 | |
| 901 | static int |
| 902 | append_ast_simple_slice(_PyUnicodeWriter *writer, slice_ty slice) |
| 903 | { |
| 904 | if (slice->v.Slice.lower) { |
| 905 | if (-1 == append_ast_expr(writer, slice->v.Slice.lower, false)) { |
| 906 | return -1; |
| 907 | } |
| 908 | } |
| 909 | |
| 910 | if (-1 == append_charp(writer, ":")) { |
| 911 | return -1; |
| 912 | } |
| 913 | |
| 914 | if (slice->v.Slice.upper) { |
| 915 | if (-1 == append_ast_expr(writer, slice->v.Slice.upper, false)) { |
| 916 | return -1; |
| 917 | } |
| 918 | } |
| 919 | |
| 920 | if (slice->v.Slice.step) { |
| 921 | if (-1 == append_charp(writer, ":")) { |
| 922 | return -1; |
| 923 | } |
| 924 | if (-1 == append_ast_expr(writer, slice->v.Slice.step, false)) { |
| 925 | return -1; |
| 926 | } |
| 927 | } |
| 928 | return 0; |
| 929 | } |
| 930 | |
| 931 | static int |
| 932 | append_ast_ext_slice(_PyUnicodeWriter *writer, slice_ty slice) |
| 933 | { |
| 934 | Py_ssize_t i, dims_count; |
| 935 | dims_count = asdl_seq_LEN(slice->v.ExtSlice.dims); |
| 936 | for (i = 0; i < dims_count; i++) { |
| 937 | if (i > 0 && -1 == append_charp(writer, ", ")) { |
| 938 | return -1; |
| 939 | } |
| 940 | if (-1 == append_ast_expr(writer, |
| 941 | (expr_ty)asdl_seq_GET(slice->v.ExtSlice.dims, i), |
| 942 | false)) { |
| 943 | return -1; |
| 944 | } |
| 945 | } |
| 946 | return 0; |
| 947 | } |
| 948 | |
| 949 | static int |
| 950 | append_ast_slice(_PyUnicodeWriter *writer, slice_ty slice, bool omit_parens) |
| 951 | { |
| 952 | switch(slice->kind) { |
| 953 | case Slice_kind: |
| 954 | return append_ast_simple_slice(writer, slice); |
| 955 | case ExtSlice_kind: |
| 956 | return append_ast_ext_slice(writer, slice); |
| 957 | case Index_kind: |
| 958 | return append_ast_expr(writer, slice->v.Index.value, omit_parens); |
| 959 | default: |
| 960 | PyErr_SetString(PyExc_SystemError, |
| 961 | "unexpected slice kind"); |
| 962 | return -1; |
| 963 | } |
| 964 | } |
| 965 | |
| 966 | static int |
| 967 | append_ast_subscript(_PyUnicodeWriter *writer, expr_ty e) |
| 968 | { |
| 969 | if (-1 == append_ast_expr(writer, e->v.Subscript.value, false)) { |
| 970 | return -1; |
| 971 | } |
| 972 | |
| 973 | if (-1 == append_charp(writer, "[")) { |
| 974 | return -1; |
| 975 | } |
| 976 | |
| 977 | if (-1 == append_ast_slice(writer, e->v.Subscript.slice, true)) { |
| 978 | return -1; |
| 979 | } |
| 980 | |
| 981 | return append_charp(writer, "]"); |
| 982 | } |
| 983 | |
| 984 | static int |
| 985 | append_ast_starred(_PyUnicodeWriter *writer, expr_ty e) |
| 986 | { |
| 987 | if (-1 == append_charp(writer, "*")) { |
| 988 | return -1; |
| 989 | } |
| 990 | |
| 991 | return append_ast_expr(writer, e->v.Starred.value, false); |
| 992 | } |
| 993 | |
| 994 | static int |
| 995 | append_ast_yield(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens) |
| 996 | { |
| 997 | if (!omit_parens && -1 == append_charp(writer, "(")) { |
| 998 | return -1; |
| 999 | } |
| 1000 | |
| 1001 | if (-1 == append_charp(writer, e->v.Yield.value ? "yield " : "yield")) { |
| 1002 | return -1; |
| 1003 | } |
| 1004 | |
| 1005 | if (e->v.Yield.value) { |
| 1006 | if (-1 == append_ast_expr(writer, e->v.Yield.value, false)) { |
| 1007 | return -1; |
| 1008 | } |
| 1009 | } |
| 1010 | return omit_parens ? 0 : append_charp(writer, ")"); |
| 1011 | } |
| 1012 | |
| 1013 | static int |
| 1014 | append_ast_yield_from(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens) |
| 1015 | { |
| 1016 | if (!omit_parens && -1 == append_charp(writer, "(")) { |
| 1017 | return -1; |
| 1018 | } |
| 1019 | |
| 1020 | if (-1 == append_charp(writer, |
| 1021 | e->v.YieldFrom.value ? "yield from " : "yield from")) { |
| 1022 | return -1; |
| 1023 | } |
| 1024 | |
| 1025 | if (e->v.YieldFrom.value) { |
| 1026 | if (-1 == append_ast_expr(writer, e->v.YieldFrom.value, false)) { |
| 1027 | return -1; |
| 1028 | } |
| 1029 | } |
| 1030 | return omit_parens ? 0 : append_charp(writer, ")"); |
| 1031 | } |
| 1032 | |
| 1033 | static int |
| 1034 | append_ast_await(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens) |
| 1035 | { |
| 1036 | if (!omit_parens && -1 == append_charp(writer, "(")) { |
| 1037 | return -1; |
| 1038 | } |
| 1039 | |
| 1040 | if (-1 == append_charp(writer, e->v.Await.value ? "await " : "await")) { |
| 1041 | return -1; |
| 1042 | } |
| 1043 | |
| 1044 | if (e->v.Await.value) { |
| 1045 | if (-1 == append_ast_expr(writer, e->v.Await.value, false)) { |
| 1046 | return -1; |
| 1047 | } |
| 1048 | } |
| 1049 | return omit_parens ? 0 : append_charp(writer, ")"); |
| 1050 | } |
| 1051 | |
| 1052 | static int |
| 1053 | append_ast_expr(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens) |
| 1054 | { |
| 1055 | switch (e->kind) { |
| 1056 | case BoolOp_kind: |
| 1057 | return append_ast_boolop(writer, e, omit_parens); |
| 1058 | case BinOp_kind: |
| 1059 | return append_ast_binop(writer, e, omit_parens); |
| 1060 | case UnaryOp_kind: |
| 1061 | return append_ast_unaryop(writer, e, omit_parens); |
| 1062 | case Lambda_kind: |
| 1063 | return append_ast_lambda(writer, e, omit_parens); |
| 1064 | case IfExp_kind: |
| 1065 | return append_ast_ifexp(writer, e, omit_parens); |
| 1066 | case Dict_kind: |
| 1067 | return append_ast_dict(writer, e); |
| 1068 | case Set_kind: |
| 1069 | return append_ast_set(writer, e); |
| 1070 | case GeneratorExp_kind: |
| 1071 | return append_ast_genexp(writer, e, omit_parens); |
| 1072 | case ListComp_kind: |
| 1073 | return append_ast_listcomp(writer, e); |
| 1074 | case SetComp_kind: |
| 1075 | return append_ast_setcomp(writer, e); |
| 1076 | case DictComp_kind: |
| 1077 | return append_ast_dictcomp(writer, e); |
| 1078 | case Yield_kind: |
| 1079 | return append_ast_yield(writer, e, omit_parens); |
| 1080 | case YieldFrom_kind: |
| 1081 | return append_ast_yield_from(writer, e, omit_parens); |
| 1082 | case Await_kind: |
| 1083 | return append_ast_await(writer, e, omit_parens); |
| 1084 | case Compare_kind: |
| 1085 | return append_ast_compare(writer, e, omit_parens); |
| 1086 | case Call_kind: |
| 1087 | return append_ast_call(writer, e); |
| 1088 | case Constant_kind: |
| 1089 | return append_repr(writer, e->v.Constant.value); |
| 1090 | case Num_kind: |
| 1091 | return append_repr(writer, e->v.Num.n); |
| 1092 | case Str_kind: |
| 1093 | return append_repr(writer, e->v.Str.s); |
| 1094 | case JoinedStr_kind: |
| 1095 | return append_joinedstr(writer, e, false); |
| 1096 | case FormattedValue_kind: |
| 1097 | return append_formattedvalue(writer, e, false); |
| 1098 | case Bytes_kind: |
| 1099 | return append_repr(writer, e->v.Bytes.s); |
| 1100 | case Ellipsis_kind: |
| 1101 | return append_charp(writer, "..."); |
| 1102 | case NameConstant_kind: |
| 1103 | return append_repr(writer, e->v.NameConstant.value); |
| 1104 | /* The following exprs can be assignment targets. */ |
| 1105 | case Attribute_kind: |
| 1106 | return append_ast_attribute(writer, e); |
| 1107 | case Subscript_kind: |
| 1108 | return append_ast_subscript(writer, e); |
| 1109 | case Starred_kind: |
| 1110 | return append_ast_starred(writer, e); |
| 1111 | case Name_kind: |
| 1112 | return _PyUnicodeWriter_WriteStr(writer, e->v.Name.id); |
| 1113 | /* child nodes of List and Tuple will have expr_context set */ |
| 1114 | case List_kind: |
| 1115 | return append_ast_list(writer, e); |
| 1116 | case Tuple_kind: |
| 1117 | return append_ast_tuple(writer, e, omit_parens); |
| 1118 | default: |
| 1119 | PyErr_SetString(PyExc_SystemError, |
| 1120 | "unknown expression kind"); |
| 1121 | return -1; |
| 1122 | } |
| 1123 | } |
| 1124 | |
| 1125 | static int |
Stéphane Wirtel | 83ab995 | 2018-02-01 17:59:27 +0100 | [diff] [blame^] | 1126 | maybe_init_static_strings(void) |
Guido van Rossum | 95e4d58 | 2018-01-26 08:20:18 -0800 | [diff] [blame] | 1127 | { |
| 1128 | if (!_str_open_br && |
| 1129 | !(_str_open_br = PyUnicode_InternFromString("{"))) { |
| 1130 | return -1; |
| 1131 | } |
| 1132 | if (!_str_dbl_open_br && |
| 1133 | !(_str_dbl_open_br = PyUnicode_InternFromString("{{"))) { |
| 1134 | return -1; |
| 1135 | } |
| 1136 | if (!_str_close_br && |
| 1137 | !(_str_close_br = PyUnicode_InternFromString("}"))) { |
| 1138 | return -1; |
| 1139 | } |
| 1140 | if (!_str_dbl_close_br && |
| 1141 | !(_str_dbl_close_br = PyUnicode_InternFromString("}}"))) { |
| 1142 | return -1; |
| 1143 | } |
| 1144 | return 0; |
| 1145 | } |
| 1146 | |
| 1147 | static PyObject * |
| 1148 | expr_as_unicode(expr_ty e, bool omit_parens) |
| 1149 | { |
| 1150 | _PyUnicodeWriter writer; |
| 1151 | _PyUnicodeWriter_Init(&writer); |
| 1152 | writer.min_length = 256; |
| 1153 | writer.overallocate = 1; |
| 1154 | if (-1 == maybe_init_static_strings() || |
| 1155 | -1 == append_ast_expr(&writer, e, omit_parens)) |
| 1156 | { |
| 1157 | _PyUnicodeWriter_Dealloc(&writer); |
| 1158 | return NULL; |
| 1159 | } |
| 1160 | return _PyUnicodeWriter_Finish(&writer); |
| 1161 | } |
| 1162 | |
| 1163 | PyObject * |
| 1164 | _PyAST_ExprAsUnicode(expr_ty e, bool omit_parens) |
| 1165 | { |
| 1166 | return expr_as_unicode(e, omit_parens); |
| 1167 | } |