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bpo-44368: Improve syntax errors with invalid as pattern targets (GH-26632)

This commit is contained in:
Pablo Galindo 2021-06-10 23:50:32 +01:00 committed by GitHub
parent e7b4644607
commit 05073036dc
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 332 additions and 213 deletions
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4
Grammar/python.gram
View File

@ -244,6 +244,7 @@ pattern[pattern_ty]:
as_pattern[pattern_ty]: as_pattern[pattern_ty]:
| pattern=or_pattern 'as' target=pattern_capture_target { | pattern=or_pattern 'as' target=pattern_capture_target {
_PyAST_MatchAs(pattern, target->v.Name.id, EXTRA) } _PyAST_MatchAs(pattern, target->v.Name.id, EXTRA) }
| invalid_as_pattern
or_pattern[pattern_ty]: or_pattern[pattern_ty]:
| patterns[asdl_pattern_seq*]='|'.closed_pattern+ { | patterns[asdl_pattern_seq*]='|'.closed_pattern+ {
asdl_seq_LEN(patterns) == 1 ? asdl_seq_GET(patterns, 0) : _PyAST_MatchOr(patterns, EXTRA) } asdl_seq_LEN(patterns) == 1 ? asdl_seq_GET(patterns, 0) : _PyAST_MatchOr(patterns, EXTRA) }
@ -974,6 +975,9 @@ invalid_case_block:
| "case" patterns guard? !':' { RAISE_SYNTAX_ERROR("expected ':'") } | "case" patterns guard? !':' { RAISE_SYNTAX_ERROR("expected ':'") }
| a="case" patterns guard? ':' NEWLINE !INDENT { | a="case" patterns guard? ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after 'case' statement on line %d", a->lineno) } RAISE_INDENTATION_ERROR("expected an indented block after 'case' statement on line %d", a->lineno) }
invalid_as_pattern:
| or_pattern 'as' a="_" { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "cannot use '_' as a target") }
| or_pattern 'as' !NAME a=expression { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "invalid pattern target") }
invalid_if_stmt: invalid_if_stmt:
| 'if' named_expression NEWLINE { RAISE_SYNTAX_ERROR("expected ':'") } | 'if' named_expression NEWLINE { RAISE_SYNTAX_ERROR("expected ':'") }
| a='if' a=named_expression ':' NEWLINE !INDENT { | a='if' a=named_expression ':' NEWLINE !INDENT {

14
Lib/test/test_syntax.py
View File

@ -1226,6 +1226,20 @@ Corner-cases that used to crash:
>>> import ä £ >>> import ä £
Traceback (most recent call last): Traceback (most recent call last):
SyntaxError: invalid character '£' (U+00A3) SyntaxError: invalid character '£' (U+00A3)
Invalid pattern matching constructs:
>>> match ...:
... case 42 as _:
... ...
Traceback (most recent call last):
SyntaxError: cannot use '_' as a target
>>> match ...:
... case 42 as 1+2+4:
... ...
Traceback (most recent call last):
SyntaxError: invalid pattern target
""" """
import re import re

1
Misc/NEWS.d/next/Core and Builtins/2021-06-09-22-56-59.bpo-44368.vgT0Cx.rst Normal file
View File

@ -0,0 +1 @@
Improve syntax errors for invalid "as" targets. Patch by Pablo Galindo

526
Parser/parser.c
View File

@ -280,218 +280,219 @@ static char *soft_keywords[] = {
#define invalid_except_stmt_indent_type 1206 #define invalid_except_stmt_indent_type 1206
#define invalid_match_stmt_type 1207 #define invalid_match_stmt_type 1207
#define invalid_case_block_type 1208 #define invalid_case_block_type 1208
#define invalid_if_stmt_type 1209 #define invalid_as_pattern_type 1209
#define invalid_elif_stmt_type 1210 #define invalid_if_stmt_type 1210
#define invalid_else_stmt_type 1211 #define invalid_elif_stmt_type 1211
#define invalid_while_stmt_type 1212 #define invalid_else_stmt_type 1212
#define invalid_for_stmt_type 1213 #define invalid_while_stmt_type 1213
#define invalid_def_raw_type 1214 #define invalid_for_stmt_type 1214
#define invalid_class_def_raw_type 1215 #define invalid_def_raw_type 1215
#define invalid_double_starred_kvpairs_type 1216 #define invalid_class_def_raw_type 1216
#define invalid_kvpair_type 1217 #define invalid_double_starred_kvpairs_type 1217
#define _loop0_1_type 1218 #define invalid_kvpair_type 1218
#define _loop0_2_type 1219 #define _loop0_1_type 1219
#define _loop0_4_type 1220 #define _loop0_2_type 1220
#define _gather_3_type 1221 #define _loop0_4_type 1221
#define _loop0_6_type 1222 #define _gather_3_type 1222
#define _gather_5_type 1223 #define _loop0_6_type 1223
#define _loop0_8_type 1224 #define _gather_5_type 1224
#define _gather_7_type 1225 #define _loop0_8_type 1225
#define _loop0_10_type 1226 #define _gather_7_type 1226
#define _gather_9_type 1227 #define _loop0_10_type 1227
#define _loop1_11_type 1228 #define _gather_9_type 1228
#define _loop0_13_type 1229 #define _loop1_11_type 1229
#define _gather_12_type 1230 #define _loop0_13_type 1230
#define _tmp_14_type 1231 #define _gather_12_type 1231
#define _tmp_15_type 1232 #define _tmp_14_type 1232
#define _tmp_16_type 1233 #define _tmp_15_type 1233
#define _tmp_17_type 1234 #define _tmp_16_type 1234
#define _tmp_18_type 1235 #define _tmp_17_type 1235
#define _tmp_19_type 1236 #define _tmp_18_type 1236
#define _tmp_20_type 1237 #define _tmp_19_type 1237
#define _tmp_21_type 1238 #define _tmp_20_type 1238
#define _loop1_22_type 1239 #define _tmp_21_type 1239
#define _tmp_23_type 1240 #define _loop1_22_type 1240
#define _tmp_24_type 1241 #define _tmp_23_type 1241
#define _loop0_26_type 1242 #define _tmp_24_type 1242
#define _gather_25_type 1243 #define _loop0_26_type 1243
#define _loop0_28_type 1244 #define _gather_25_type 1244
#define _gather_27_type 1245 #define _loop0_28_type 1245
#define _tmp_29_type 1246 #define _gather_27_type 1246
#define _tmp_30_type 1247 #define _tmp_29_type 1247
#define _loop0_31_type 1248 #define _tmp_30_type 1248
#define _loop1_32_type 1249 #define _loop0_31_type 1249
#define _loop0_34_type 1250 #define _loop1_32_type 1250
#define _gather_33_type 1251 #define _loop0_34_type 1251
#define _tmp_35_type 1252 #define _gather_33_type 1252
#define _loop0_37_type 1253 #define _tmp_35_type 1253
#define _gather_36_type 1254 #define _loop0_37_type 1254
#define _tmp_38_type 1255 #define _gather_36_type 1255
#define _loop0_40_type 1256 #define _tmp_38_type 1256
#define _gather_39_type 1257 #define _loop0_40_type 1257
#define _loop0_42_type 1258 #define _gather_39_type 1258
#define _gather_41_type 1259 #define _loop0_42_type 1259
#define _loop0_44_type 1260 #define _gather_41_type 1260
#define _gather_43_type 1261 #define _loop0_44_type 1261
#define _loop0_46_type 1262 #define _gather_43_type 1262
#define _gather_45_type 1263 #define _loop0_46_type 1263
#define _tmp_47_type 1264 #define _gather_45_type 1264
#define _loop1_48_type 1265 #define _tmp_47_type 1265
#define _tmp_49_type 1266 #define _loop1_48_type 1266
#define _loop1_50_type 1267 #define _tmp_49_type 1267
#define _loop0_52_type 1268 #define _loop1_50_type 1268
#define _gather_51_type 1269 #define _loop0_52_type 1269
#define _tmp_53_type 1270 #define _gather_51_type 1270
#define _tmp_54_type 1271 #define _tmp_53_type 1271
#define _tmp_55_type 1272 #define _tmp_54_type 1272
#define _tmp_56_type 1273 #define _tmp_55_type 1273
#define _loop0_58_type 1274 #define _tmp_56_type 1274
#define _gather_57_type 1275 #define _loop0_58_type 1275
#define _loop0_60_type 1276 #define _gather_57_type 1276
#define _gather_59_type 1277 #define _loop0_60_type 1277
#define _tmp_61_type 1278 #define _gather_59_type 1278
#define _loop0_63_type 1279 #define _tmp_61_type 1279
#define _gather_62_type 1280 #define _loop0_63_type 1280
#define _loop0_65_type 1281 #define _gather_62_type 1281
#define _gather_64_type 1282 #define _loop0_65_type 1282
#define _tmp_66_type 1283 #define _gather_64_type 1283
#define _tmp_67_type 1284 #define _tmp_66_type 1284
#define _tmp_68_type 1285 #define _tmp_67_type 1285
#define _tmp_69_type 1286 #define _tmp_68_type 1286
#define _loop0_70_type 1287 #define _tmp_69_type 1287
#define _loop0_71_type 1288 #define _loop0_70_type 1288
#define _loop0_72_type 1289 #define _loop0_71_type 1289
#define _loop1_73_type 1290 #define _loop0_72_type 1290
#define _loop0_74_type 1291 #define _loop1_73_type 1291
#define _loop1_75_type 1292 #define _loop0_74_type 1292
#define _loop1_76_type 1293 #define _loop1_75_type 1293
#define _loop1_77_type 1294 #define _loop1_76_type 1294
#define _loop0_78_type 1295 #define _loop1_77_type 1295
#define _loop1_79_type 1296 #define _loop0_78_type 1296
#define _loop0_80_type 1297 #define _loop1_79_type 1297
#define _loop1_81_type 1298 #define _loop0_80_type 1298
#define _loop0_82_type 1299 #define _loop1_81_type 1299
#define _loop1_83_type 1300 #define _loop0_82_type 1300
#define _loop1_84_type 1301 #define _loop1_83_type 1301
#define _tmp_85_type 1302 #define _loop1_84_type 1302
#define _loop1_86_type 1303 #define _tmp_85_type 1303
#define _loop0_88_type 1304 #define _loop1_86_type 1304
#define _gather_87_type 1305 #define _loop0_88_type 1305
#define _loop1_89_type 1306 #define _gather_87_type 1306
#define _loop0_90_type 1307 #define _loop1_89_type 1307
#define _loop0_91_type 1308 #define _loop0_90_type 1308
#define _loop0_92_type 1309 #define _loop0_91_type 1309
#define _loop1_93_type 1310 #define _loop0_92_type 1310
#define _loop0_94_type 1311 #define _loop1_93_type 1311
#define _loop1_95_type 1312 #define _loop0_94_type 1312
#define _loop1_96_type 1313 #define _loop1_95_type 1313
#define _loop1_97_type 1314 #define _loop1_96_type 1314
#define _loop0_98_type 1315 #define _loop1_97_type 1315
#define _loop1_99_type 1316 #define _loop0_98_type 1316
#define _loop0_100_type 1317 #define _loop1_99_type 1317
#define _loop1_101_type 1318 #define _loop0_100_type 1318
#define _loop0_102_type 1319 #define _loop1_101_type 1319
#define _loop1_103_type 1320 #define _loop0_102_type 1320
#define _loop1_104_type 1321 #define _loop1_103_type 1321
#define _loop1_105_type 1322 #define _loop1_104_type 1322
#define _loop1_106_type 1323 #define _loop1_105_type 1323
#define _tmp_107_type 1324 #define _loop1_106_type 1324
#define _loop0_109_type 1325 #define _tmp_107_type 1325
#define _gather_108_type 1326 #define _loop0_109_type 1326
#define _tmp_110_type 1327 #define _gather_108_type 1327
#define _tmp_111_type 1328 #define _tmp_110_type 1328
#define _tmp_112_type 1329 #define _tmp_111_type 1329
#define _tmp_113_type 1330 #define _tmp_112_type 1330
#define _loop1_114_type 1331 #define _tmp_113_type 1331
#define _tmp_115_type 1332 #define _loop1_114_type 1332
#define _tmp_116_type 1333 #define _tmp_115_type 1333
#define _tmp_117_type 1334 #define _tmp_116_type 1334
#define _loop0_119_type 1335 #define _tmp_117_type 1335
#define _gather_118_type 1336 #define _loop0_119_type 1336
#define _loop1_120_type 1337 #define _gather_118_type 1337
#define _loop0_121_type 1338 #define _loop1_120_type 1338
#define _loop0_122_type 1339 #define _loop0_121_type 1339
#define _loop0_124_type 1340 #define _loop0_122_type 1340
#define _gather_123_type 1341 #define _loop0_124_type 1341
#define _tmp_125_type 1342 #define _gather_123_type 1342
#define _loop0_127_type 1343 #define _tmp_125_type 1343
#define _gather_126_type 1344 #define _loop0_127_type 1344
#define _loop0_129_type 1345 #define _gather_126_type 1345
#define _gather_128_type 1346 #define _loop0_129_type 1346
#define _loop0_131_type 1347 #define _gather_128_type 1347
#define _gather_130_type 1348 #define _loop0_131_type 1348
#define _loop0_133_type 1349 #define _gather_130_type 1349
#define _gather_132_type 1350 #define _loop0_133_type 1350
#define _loop0_134_type 1351 #define _gather_132_type 1351
#define _loop0_136_type 1352 #define _loop0_134_type 1352
#define _gather_135_type 1353 #define _loop0_136_type 1353
#define _loop1_137_type 1354 #define _gather_135_type 1354
#define _tmp_138_type 1355 #define _loop1_137_type 1355
#define _loop0_140_type 1356 #define _tmp_138_type 1356
#define _gather_139_type 1357 #define _loop0_140_type 1357
#define _tmp_141_type 1358 #define _gather_139_type 1358
#define _tmp_142_type 1359 #define _tmp_141_type 1359
#define _tmp_143_type 1360 #define _tmp_142_type 1360
#define _tmp_144_type 1361 #define _tmp_143_type 1361
#define _tmp_145_type 1362 #define _tmp_144_type 1362
#define _tmp_146_type 1363 #define _tmp_145_type 1363
#define _loop0_147_type 1364 #define _tmp_146_type 1364
#define _loop0_148_type 1365 #define _loop0_147_type 1365
#define _loop0_149_type 1366 #define _loop0_148_type 1366
#define _tmp_150_type 1367 #define _loop0_149_type 1367
#define _tmp_151_type 1368 #define _tmp_150_type 1368
#define _tmp_152_type 1369 #define _tmp_151_type 1369
#define _tmp_153_type 1370 #define _tmp_152_type 1370
#define _loop0_154_type 1371 #define _tmp_153_type 1371
#define _loop1_155_type 1372 #define _loop0_154_type 1372
#define _loop0_156_type 1373 #define _loop1_155_type 1373
#define _loop1_157_type 1374 #define _loop0_156_type 1374
#define _tmp_158_type 1375 #define _loop1_157_type 1375
#define _tmp_159_type 1376 #define _tmp_158_type 1376
#define _tmp_160_type 1377 #define _tmp_159_type 1377
#define _loop0_162_type 1378 #define _tmp_160_type 1378
#define _gather_161_type 1379 #define _loop0_162_type 1379
#define _loop0_164_type 1380 #define _gather_161_type 1380
#define _gather_163_type 1381 #define _loop0_164_type 1381
#define _loop0_166_type 1382 #define _gather_163_type 1382
#define _gather_165_type 1383 #define _loop0_166_type 1383
#define _loop0_168_type 1384 #define _gather_165_type 1384
#define _gather_167_type 1385 #define _loop0_168_type 1385
#define _tmp_169_type 1386 #define _gather_167_type 1386
#define _tmp_170_type 1387 #define _tmp_169_type 1387
#define _tmp_171_type 1388 #define _tmp_170_type 1388
#define _tmp_172_type 1389 #define _tmp_171_type 1389
#define _tmp_173_type 1390 #define _tmp_172_type 1390
#define _tmp_174_type 1391 #define _tmp_173_type 1391
#define _loop0_176_type 1392 #define _tmp_174_type 1392
#define _gather_175_type 1393 #define _loop0_176_type 1393
#define _tmp_177_type 1394 #define _gather_175_type 1394
#define _tmp_178_type 1395 #define _tmp_177_type 1395
#define _tmp_179_type 1396 #define _tmp_178_type 1396
#define _tmp_180_type 1397 #define _tmp_179_type 1397
#define _tmp_181_type 1398 #define _tmp_180_type 1398
#define _tmp_182_type 1399 #define _tmp_181_type 1399
#define _tmp_183_type 1400 #define _tmp_182_type 1400
#define _tmp_184_type 1401 #define _tmp_183_type 1401
#define _tmp_185_type 1402 #define _tmp_184_type 1402
#define _tmp_186_type 1403 #define _tmp_185_type 1403
#define _tmp_187_type 1404 #define _tmp_186_type 1404
#define _tmp_188_type 1405 #define _tmp_187_type 1405
#define _tmp_189_type 1406 #define _tmp_188_type 1406
#define _tmp_190_type 1407 #define _tmp_189_type 1407
#define _tmp_191_type 1408 #define _tmp_190_type 1408
#define _tmp_192_type 1409 #define _tmp_191_type 1409
#define _tmp_193_type 1410 #define _tmp_192_type 1410
#define _tmp_194_type 1411 #define _tmp_193_type 1411
#define _tmp_195_type 1412 #define _tmp_194_type 1412
#define _tmp_196_type 1413 #define _tmp_195_type 1413
#define _tmp_197_type 1414 #define _tmp_196_type 1414
#define _tmp_198_type 1415 #define _tmp_197_type 1415
#define _tmp_199_type 1416 #define _tmp_198_type 1416
#define _tmp_200_type 1417 #define _tmp_199_type 1417
#define _tmp_201_type 1418 #define _tmp_200_type 1418
#define _tmp_202_type 1419 #define _tmp_201_type 1419
#define _tmp_203_type 1420 #define _tmp_202_type 1420
#define _tmp_203_type 1421
static mod_ty file_rule(Parser *p); static mod_ty file_rule(Parser *p);
static mod_ty interactive_rule(Parser *p); static mod_ty interactive_rule(Parser *p);
@ -702,6 +703,7 @@ static void *invalid_finally_stmt_rule(Parser *p);
static void *invalid_except_stmt_indent_rule(Parser *p); static void *invalid_except_stmt_indent_rule(Parser *p);
static void *invalid_match_stmt_rule(Parser *p); static void *invalid_match_stmt_rule(Parser *p);
static void *invalid_case_block_rule(Parser *p); static void *invalid_case_block_rule(Parser *p);
static void *invalid_as_pattern_rule(Parser *p);
static void *invalid_if_stmt_rule(Parser *p); static void *invalid_if_stmt_rule(Parser *p);
static void *invalid_elif_stmt_rule(Parser *p); static void *invalid_elif_stmt_rule(Parser *p);
static void *invalid_else_stmt_rule(Parser *p); static void *invalid_else_stmt_rule(Parser *p);
@ -5601,7 +5603,7 @@ pattern_rule(Parser *p)
return _res; return _res;
} }
// as_pattern: or_pattern 'as' pattern_capture_target // as_pattern: or_pattern 'as' pattern_capture_target | invalid_as_pattern
static pattern_ty static pattern_ty
as_pattern_rule(Parser *p) as_pattern_rule(Parser *p)
{ {
@ -5660,6 +5662,25 @@ as_pattern_rule(Parser *p)
D(fprintf(stderr, "%*c%s as_pattern[%d-%d]: %s failed!\n", p->level, ' ', D(fprintf(stderr, "%*c%s as_pattern[%d-%d]: %s failed!\n", p->level, ' ',
p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "or_pattern 'as' pattern_capture_target")); p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "or_pattern 'as' pattern_capture_target"));
} }
if (p->call_invalid_rules) { // invalid_as_pattern
if (p->error_indicator) {
D(p->level--);
return NULL;
}
D(fprintf(stderr, "%*c> as_pattern[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "invalid_as_pattern"));
void *invalid_as_pattern_var;
if (
(invalid_as_pattern_var = invalid_as_pattern_rule(p)) // invalid_as_pattern
)
{
D(fprintf(stderr, "%*c+ as_pattern[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "invalid_as_pattern"));
_res = invalid_as_pattern_var;
goto done;
}
p->mark = _mark;
D(fprintf(stderr, "%*c%s as_pattern[%d-%d]: %s failed!\n", p->level, ' ',
p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "invalid_as_pattern"));
}
_res = NULL; _res = NULL;
done: done:
D(p->level--); D(p->level--);
@ -20210,6 +20231,85 @@ invalid_case_block_rule(Parser *p)
return _res; return _res;
} }
// invalid_as_pattern: or_pattern 'as' "_" | or_pattern 'as' !NAME expression
static void *
invalid_as_pattern_rule(Parser *p)
{
D(p->level++);
if (p->error_indicator) {
D(p->level--);
return NULL;
}
void * _res = NULL;
int _mark = p->mark;
{ // or_pattern 'as' "_"
if (p->error_indicator) {
D(p->level--);
return NULL;
}
D(fprintf(stderr, "%*c> invalid_as_pattern[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "or_pattern 'as' \"_\""));
Token * _keyword;
expr_ty a;
pattern_ty or_pattern_var;
if (
(or_pattern_var = or_pattern_rule(p)) // or_pattern
&&
(_keyword = _PyPegen_expect_token(p, 520)) // token='as'
&&
(a = _PyPegen_expect_soft_keyword(p, "_")) // soft_keyword='"_"'
)
{
D(fprintf(stderr, "%*c+ invalid_as_pattern[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "or_pattern 'as' \"_\""));
_res = RAISE_SYNTAX_ERROR_KNOWN_LOCATION ( a , "cannot use '_' as a target" );
if (_res == NULL && PyErr_Occurred()) {
p->error_indicator = 1;
D(p->level--);
return NULL;
}
goto done;
}
p->mark = _mark;
D(fprintf(stderr, "%*c%s invalid_as_pattern[%d-%d]: %s failed!\n", p->level, ' ',
p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "or_pattern 'as' \"_\""));
}
{ // or_pattern 'as' !NAME expression
if (p->error_indicator) {
D(p->level--);
return NULL;
}
D(fprintf(stderr, "%*c> invalid_as_pattern[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "or_pattern 'as' !NAME expression"));
Token * _keyword;
expr_ty a;
pattern_ty or_pattern_var;
if (
(or_pattern_var = or_pattern_rule(p)) // or_pattern
&&
(_keyword = _PyPegen_expect_token(p, 520)) // token='as'
&&
_PyPegen_lookahead_with_name(0, _PyPegen_name_token, p)
&&
(a = expression_rule(p)) // expression
)
{
D(fprintf(stderr, "%*c+ invalid_as_pattern[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "or_pattern 'as' !NAME expression"));
_res = RAISE_SYNTAX_ERROR_KNOWN_LOCATION ( a , "invalid pattern target" );
if (_res == NULL && PyErr_Occurred()) {
p->error_indicator = 1;
D(p->level--);
return NULL;
}
goto done;
}
p->mark = _mark;
D(fprintf(stderr, "%*c%s invalid_as_pattern[%d-%d]: %s failed!\n", p->level, ' ',
p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "or_pattern 'as' !NAME expression"));
}
_res = NULL;
done:
D(p->level--);
return _res;
}
// invalid_if_stmt: // invalid_if_stmt:
// | 'if' named_expression NEWLINE // | 'if' named_expression NEWLINE
// | 'if' named_expression ':' NEWLINE !INDENT // | 'if' named_expression ':' NEWLINE !INDENT