1 /*
2 +----------------------------------------------------------------------+
3 | Copyright (c) The PHP Group |
4 +----------------------------------------------------------------------+
5 | This source file is subject to version 3.01 of the PHP license, |
6 | that is bundled with this package in the file LICENSE, and is |
7 | available through the world-wide-web at the following url: |
8 | https://www.php.net/license/3_01.txt |
9 | If you did not receive a copy of the PHP license and are unable to |
10 | obtain it through the world-wide-web, please send a note to |
11 | license@php.net so we can mail you a copy immediately. |
12 +----------------------------------------------------------------------+
13 | Author: Andrei Zmievski <andrei@php.net> |
14 +----------------------------------------------------------------------+
15 */
16
17 #ifdef HAVE_CONFIG_H
18 #include "config.h"
19 #endif
20
21 #include "php.h"
22 #include "ext/standard/info.h"
23 #include "php_tokenizer.h"
24
25 #include "zend.h"
26 #include "zend_exceptions.h"
27 #include "zend_language_scanner.h"
28 #include "zend_language_scanner_defs.h"
29 #include <zend_language_parser.h>
30 #include "zend_interfaces.h"
31
32 #include "tokenizer_data_arginfo.h"
33 #include "tokenizer_arginfo.h"
34
35 #define zendtext LANG_SCNG(yy_text)
36 #define zendleng LANG_SCNG(yy_leng)
37 #define zendcursor LANG_SCNG(yy_cursor)
38 #define zendlimit LANG_SCNG(yy_limit)
39
40 static zend_class_entry *php_token_ce;
41
42 /* {{{ tokenizer_module_entry */
43 zend_module_entry tokenizer_module_entry = {
44 STANDARD_MODULE_HEADER,
45 "tokenizer",
46 ext_functions,
47 PHP_MINIT(tokenizer),
48 NULL,
49 NULL,
50 NULL,
51 PHP_MINFO(tokenizer),
52 PHP_TOKENIZER_VERSION,
53 STANDARD_MODULE_PROPERTIES
54 };
55 /* }}} */
56
57 #ifdef COMPILE_DL_TOKENIZER
ZEND_GET_MODULE(tokenizer)58 ZEND_GET_MODULE(tokenizer)
59 #endif
60
61 static zval *php_token_get_id(zval *obj) {
62 zval *id = OBJ_PROP_NUM(Z_OBJ_P(obj), 0);
63 if (Z_ISUNDEF_P(id)) {
64 zend_throw_error(NULL,
65 "Typed property PhpToken::$id must not be accessed before initialization");
66 return NULL;
67 }
68
69 ZVAL_DEREF(id);
70 ZEND_ASSERT(Z_TYPE_P(id) == IS_LONG);
71 return id;
72 }
73
php_token_get_text(zval * obj)74 static zend_string *php_token_get_text(zval *obj) {
75 zval *text_zval = OBJ_PROP_NUM(Z_OBJ_P(obj), 1);
76 if (Z_ISUNDEF_P(text_zval)) {
77 zend_throw_error(NULL,
78 "Typed property PhpToken::$text must not be accessed before initialization");
79 return NULL;
80 }
81
82 ZVAL_DEREF(text_zval);
83 ZEND_ASSERT(Z_TYPE_P(text_zval) == IS_STRING);
84 return Z_STR_P(text_zval);
85 }
86
87 static bool tokenize_common(
88 zval *return_value, zend_string *source, zend_long flags, zend_class_entry *token_class);
89
PHP_METHOD(PhpToken,tokenize)90 PHP_METHOD(PhpToken, tokenize)
91 {
92 zend_string *source;
93 zend_long flags = 0;
94 zend_class_entry *token_class;
95
96 ZEND_PARSE_PARAMETERS_START(1, 2)
97 Z_PARAM_STR(source)
98 Z_PARAM_OPTIONAL
99 Z_PARAM_LONG(flags)
100 ZEND_PARSE_PARAMETERS_END();
101
102 token_class = zend_get_called_scope(execute_data);
103
104 /* Check construction preconditions in advance, so these are not repeated for each token. */
105 if (token_class->ce_flags & ZEND_ACC_EXPLICIT_ABSTRACT_CLASS) {
106 zend_throw_error(NULL, "Cannot instantiate abstract class %s", ZSTR_VAL(token_class->name));
107 RETURN_THROWS();
108 }
109 if (zend_update_class_constants(token_class) == FAILURE) {
110 RETURN_THROWS();
111 }
112
113 if (!tokenize_common(return_value, source, flags, token_class)) {
114 RETURN_THROWS();
115 }
116 }
117
PHP_METHOD(PhpToken,__construct)118 PHP_METHOD(PhpToken, __construct)
119 {
120 zend_long id;
121 zend_string *text;
122 zend_long line = -1;
123 zend_long pos = -1;
124 zend_object *obj = Z_OBJ_P(ZEND_THIS);
125
126 ZEND_PARSE_PARAMETERS_START(2, 4)
127 Z_PARAM_LONG(id)
128 Z_PARAM_STR(text)
129 Z_PARAM_OPTIONAL
130 Z_PARAM_LONG(line)
131 Z_PARAM_LONG(pos)
132 ZEND_PARSE_PARAMETERS_END();
133
134 ZVAL_LONG(OBJ_PROP_NUM(obj, 0), id);
135 zval_ptr_dtor(OBJ_PROP_NUM(obj, 1));
136 ZVAL_STR_COPY(OBJ_PROP_NUM(obj, 1), text);
137 ZVAL_LONG(OBJ_PROP_NUM(obj, 2), line);
138 ZVAL_LONG(OBJ_PROP_NUM(obj, 3), pos);
139 }
140
PHP_METHOD(PhpToken,is)141 PHP_METHOD(PhpToken, is)
142 {
143 zval *kind;
144
145 ZEND_PARSE_PARAMETERS_START(1, 1)
146 Z_PARAM_ZVAL(kind)
147 ZEND_PARSE_PARAMETERS_END();
148
149 if (Z_TYPE_P(kind) == IS_LONG) {
150 zval *id_zval = php_token_get_id(ZEND_THIS);
151 if (!id_zval) {
152 RETURN_THROWS();
153 }
154
155 RETURN_BOOL(Z_LVAL_P(id_zval) == Z_LVAL_P(kind));
156 } else if (Z_TYPE_P(kind) == IS_STRING) {
157 zend_string *text = php_token_get_text(ZEND_THIS);
158 if (!text) {
159 RETURN_THROWS();
160 }
161
162 RETURN_BOOL(zend_string_equals(text, Z_STR_P(kind)));
163 } else if (Z_TYPE_P(kind) == IS_ARRAY) {
164 zval *id_zval = NULL, *entry;
165 zend_string *text = NULL;
166 ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(kind), entry) {
167 ZVAL_DEREF(entry);
168 if (Z_TYPE_P(entry) == IS_LONG) {
169 if (!id_zval) {
170 id_zval = php_token_get_id(ZEND_THIS);
171 if (!id_zval) {
172 RETURN_THROWS();
173 }
174 }
175 if (Z_LVAL_P(id_zval) == Z_LVAL_P(entry)) {
176 RETURN_TRUE;
177 }
178 } else if (Z_TYPE_P(entry) == IS_STRING) {
179 if (!text) {
180 text = php_token_get_text(ZEND_THIS);
181 if (!text) {
182 RETURN_THROWS();
183 }
184 }
185 if (zend_string_equals(text, Z_STR_P(entry))) {
186 RETURN_TRUE;
187 }
188 } else {
189 zend_argument_type_error(1, "must only have elements of type string|int, %s given", zend_zval_value_name(entry));
190 RETURN_THROWS();
191 }
192 } ZEND_HASH_FOREACH_END();
193 RETURN_FALSE;
194 } else {
195 zend_argument_type_error(1, "must be of type string|int|array, %s given", zend_zval_value_name(kind));
196 RETURN_THROWS();
197 }
198 }
199
PHP_METHOD(PhpToken,isIgnorable)200 PHP_METHOD(PhpToken, isIgnorable)
201 {
202 ZEND_PARSE_PARAMETERS_NONE();
203
204 zval *id_zval = php_token_get_id(ZEND_THIS);
205 if (!id_zval) {
206 RETURN_THROWS();
207 }
208
209 zend_long id = Z_LVAL_P(id_zval);
210 RETURN_BOOL(id == T_WHITESPACE || id == T_COMMENT || id == T_DOC_COMMENT || id == T_OPEN_TAG);
211 }
212
PHP_METHOD(PhpToken,getTokenName)213 PHP_METHOD(PhpToken, getTokenName)
214 {
215 ZEND_PARSE_PARAMETERS_NONE();
216
217 zval *id_zval = php_token_get_id(ZEND_THIS);
218 if (!id_zval) {
219 RETURN_THROWS();
220 }
221
222 if (Z_LVAL_P(id_zval) < 256) {
223 RETURN_CHAR(Z_LVAL_P(id_zval));
224 } else {
225 const char *token_name = get_token_type_name(Z_LVAL_P(id_zval));
226 if (!token_name) {
227 RETURN_NULL();
228 }
229
230 RETURN_STRING(token_name);
231 }
232 }
233
PHP_METHOD(PhpToken,__toString)234 PHP_METHOD(PhpToken, __toString)
235 {
236 ZEND_PARSE_PARAMETERS_NONE();
237
238 zend_string *text = php_token_get_text(ZEND_THIS);
239 if (!text) {
240 RETURN_THROWS();
241 }
242
243 RETURN_STR_COPY(text);
244 }
245
246 /* {{{ PHP_MINIT_FUNCTION */
PHP_MINIT_FUNCTION(tokenizer)247 PHP_MINIT_FUNCTION(tokenizer)
248 {
249 register_tokenizer_data_symbols(module_number);
250 register_tokenizer_symbols(module_number);
251 php_token_ce = register_class_PhpToken(zend_ce_stringable);
252
253 return SUCCESS;
254 }
255 /* }}} */
256
257 /* {{{ PHP_MINFO_FUNCTION */
PHP_MINFO_FUNCTION(tokenizer)258 PHP_MINFO_FUNCTION(tokenizer)
259 {
260 php_info_print_table_start();
261 php_info_print_table_row(2, "Tokenizer Support", "enabled");
262 php_info_print_table_end();
263 }
264 /* }}} */
265
make_str(unsigned char * text,size_t leng,HashTable * interned_strings)266 static zend_string *make_str(unsigned char *text, size_t leng, HashTable *interned_strings) {
267 if (leng == 1) {
268 return ZSTR_CHAR(text[0]);
269 } else if (interned_strings) {
270 zend_string *interned_str = zend_hash_str_find_ptr(interned_strings, (char *) text, leng);
271 if (interned_str) {
272 return zend_string_copy(interned_str);
273 }
274 interned_str = zend_string_init((char *) text, leng, 0);
275 zend_hash_add_new_ptr(interned_strings, interned_str, interned_str);
276 return interned_str;
277 } else {
278 return zend_string_init((char *) text, leng, 0);
279 }
280 }
281
add_token(zval * return_value,int token_type,unsigned char * text,size_t leng,int lineno,zend_class_entry * token_class,HashTable * interned_strings)282 static void add_token(
283 zval *return_value, int token_type, unsigned char *text, size_t leng, int lineno,
284 zend_class_entry *token_class, HashTable *interned_strings) {
285 zval token;
286 if (token_class) {
287 zend_object *obj = zend_objects_new(token_class);
288 ZVAL_OBJ(&token, obj);
289 ZVAL_LONG(OBJ_PROP_NUM(obj, 0), token_type);
290 ZVAL_STR(OBJ_PROP_NUM(obj, 1), make_str(text, leng, interned_strings));
291 ZVAL_LONG(OBJ_PROP_NUM(obj, 2), lineno);
292 ZVAL_LONG(OBJ_PROP_NUM(obj, 3), text - LANG_SCNG(yy_start));
293
294 /* If the class is extended with additional properties, initialized them as well. */
295 if (UNEXPECTED(token_class->default_properties_count > 4)) {
296 zval *dst = OBJ_PROP_NUM(obj, 4);
297 zval *src = &token_class->default_properties_table[4];
298 zval *end = token_class->default_properties_table
299 + token_class->default_properties_count;
300 for (; src < end; src++, dst++) {
301 ZVAL_COPY_PROP(dst, src);
302 }
303 }
304 } else if (token_type >= 256) {
305 array_init_size(&token, 3);
306 zend_hash_real_init_packed(Z_ARRVAL(token));
307 ZEND_HASH_FILL_PACKED(Z_ARRVAL(token)) {
308 ZEND_HASH_FILL_SET_LONG(token_type);
309 ZEND_HASH_FILL_NEXT();
310 ZEND_HASH_FILL_SET_STR(make_str(text, leng, interned_strings));
311 ZEND_HASH_FILL_NEXT();
312 ZEND_HASH_FILL_SET_LONG(lineno);
313 ZEND_HASH_FILL_NEXT();
314 } ZEND_HASH_FILL_END();
315 } else {
316 ZVAL_STR(&token, make_str(text, leng, interned_strings));
317 }
318 zend_hash_next_index_insert_new(Z_ARRVAL_P(return_value), &token);
319 }
320
tokenize(zval * return_value,zend_string * source,zend_class_entry * token_class)321 static bool tokenize(zval *return_value, zend_string *source, zend_class_entry *token_class)
322 {
323 zval source_zval;
324 zend_lex_state original_lex_state;
325 zval token;
326 int token_type;
327 int token_line = 1;
328 int need_tokens = -1; /* for __halt_compiler lexing. -1 = disabled */
329 HashTable interned_strings;
330
331 ZVAL_STR_COPY(&source_zval, source);
332 zend_save_lexical_state(&original_lex_state);
333
334 zend_prepare_string_for_scanning(&source_zval, ZSTR_EMPTY_ALLOC());
335
336 LANG_SCNG(yy_state) = yycINITIAL;
337 zend_hash_init(&interned_strings, 0, NULL, NULL, 0);
338 array_init(return_value);
339
340 while ((token_type = lex_scan(&token, NULL))) {
341 ZEND_ASSERT(token_type != T_ERROR);
342
343 add_token(
344 return_value, token_type, zendtext, zendleng, token_line,
345 token_class, &interned_strings);
346
347 if (Z_TYPE(token) != IS_UNDEF) {
348 zval_ptr_dtor_nogc(&token);
349 ZVAL_UNDEF(&token);
350 }
351
352 /* after T_HALT_COMPILER collect the next three non-dropped tokens */
353 if (need_tokens != -1) {
354 if (token_type != T_WHITESPACE && token_type != T_OPEN_TAG
355 && token_type != T_COMMENT && token_type != T_DOC_COMMENT
356 && --need_tokens == 0
357 ) {
358 /* fetch the rest into a T_INLINE_HTML */
359 if (zendcursor < zendlimit) {
360 add_token(
361 return_value, T_INLINE_HTML, zendcursor, zendlimit - zendcursor,
362 token_line, token_class, &interned_strings);
363 }
364 break;
365 }
366 } else if (token_type == T_HALT_COMPILER) {
367 need_tokens = 3;
368 }
369
370 if (CG(increment_lineno)) {
371 CG(zend_lineno)++;
372 CG(increment_lineno) = 0;
373 }
374
375 token_line = CG(zend_lineno);
376 }
377
378 zval_ptr_dtor_str(&source_zval);
379 zend_restore_lexical_state(&original_lex_state);
380 zend_hash_destroy(&interned_strings);
381
382 return 1;
383 }
384
385 struct event_context {
386 zval *tokens;
387 zend_class_entry *token_class;
388 };
389
extract_token_id_to_replace(zval * token_zv,const char * text,size_t length)390 static zval *extract_token_id_to_replace(zval *token_zv, const char *text, size_t length) {
391 zval *id_zv, *text_zv;
392 ZEND_ASSERT(token_zv);
393 if (Z_TYPE_P(token_zv) == IS_ARRAY) {
394 id_zv = zend_hash_index_find(Z_ARRVAL_P(token_zv), 0);
395 text_zv = zend_hash_index_find(Z_ARRVAL_P(token_zv), 1);
396 } else if (Z_TYPE_P(token_zv) == IS_OBJECT) {
397 id_zv = OBJ_PROP_NUM(Z_OBJ_P(token_zv), 0);
398 text_zv = OBJ_PROP_NUM(Z_OBJ_P(token_zv), 1);
399 } else {
400 return NULL;
401 }
402
403 /* There are multiple candidate tokens to which this feedback may apply,
404 * check text to make sure this is the right one. */
405 ZEND_ASSERT(Z_TYPE_P(text_zv) == IS_STRING);
406 if (Z_STRLEN_P(text_zv) == length && !memcmp(Z_STRVAL_P(text_zv), text, length)) {
407 return id_zv;
408 }
409 return NULL;
410 }
411
on_event(zend_php_scanner_event event,int token,int line,const char * text,size_t length,void * context)412 static void on_event(
413 zend_php_scanner_event event, int token, int line,
414 const char *text, size_t length, void *context)
415 {
416 struct event_context *ctx = context;
417
418 switch (event) {
419 case ON_TOKEN:
420 if (token == END) break;
421 /* Special cases */
422 if (token == ';' && LANG_SCNG(yy_leng) > 1) { /* ?> or ?>\n or ?>\r\n */
423 token = T_CLOSE_TAG;
424 } else if (token == T_ECHO && LANG_SCNG(yy_leng) == sizeof("<?=") - 1) {
425 token = T_OPEN_TAG_WITH_ECHO;
426 }
427 add_token(
428 ctx->tokens, token, (unsigned char *) text, length, line, ctx->token_class, NULL);
429 break;
430 case ON_FEEDBACK: {
431 HashTable *tokens_ht = Z_ARRVAL_P(ctx->tokens);
432 zval *token_zv, *id_zv = NULL;
433 ZEND_HASH_REVERSE_FOREACH_VAL(tokens_ht, token_zv) {
434 id_zv = extract_token_id_to_replace(token_zv, text, length);
435 if (id_zv) {
436 break;
437 }
438 } ZEND_HASH_FOREACH_END();
439 ZEND_ASSERT(id_zv);
440 ZVAL_LONG(id_zv, token);
441 break;
442 }
443 case ON_STOP:
444 if (LANG_SCNG(yy_cursor) != LANG_SCNG(yy_limit)) {
445 add_token(ctx->tokens, T_INLINE_HTML, LANG_SCNG(yy_cursor),
446 LANG_SCNG(yy_limit) - LANG_SCNG(yy_cursor), CG(zend_lineno),
447 ctx->token_class, NULL);
448 }
449 break;
450 }
451 }
452
tokenize_parse(zval * return_value,zend_string * source,zend_class_entry * token_class)453 static bool tokenize_parse(
454 zval *return_value, zend_string *source, zend_class_entry *token_class)
455 {
456 zval source_zval;
457 struct event_context ctx;
458 zval token_stream;
459 zend_lex_state original_lex_state;
460 bool original_in_compilation;
461 bool success;
462
463 ZVAL_STR_COPY(&source_zval, source);
464
465 original_in_compilation = CG(in_compilation);
466 CG(in_compilation) = 1;
467 zend_save_lexical_state(&original_lex_state);
468
469 zend_prepare_string_for_scanning(&source_zval, ZSTR_EMPTY_ALLOC());
470 array_init(&token_stream);
471
472 ctx.tokens = &token_stream;
473 ctx.token_class = token_class;
474
475 CG(ast) = NULL;
476 CG(ast_arena) = zend_arena_create(1024 * 32);
477 LANG_SCNG(yy_state) = yycINITIAL;
478 LANG_SCNG(on_event) = on_event;
479 LANG_SCNG(on_event_context) = &ctx;
480
481 if((success = (zendparse() == SUCCESS))) {
482 ZVAL_COPY_VALUE(return_value, &token_stream);
483 } else {
484 zval_ptr_dtor(&token_stream);
485 }
486
487 zend_ast_destroy(CG(ast));
488 zend_arena_destroy(CG(ast_arena));
489
490 /* restore compiler and scanner global states */
491 zend_restore_lexical_state(&original_lex_state);
492 CG(in_compilation) = original_in_compilation;
493
494 zval_ptr_dtor_str(&source_zval);
495
496 return success;
497 }
498
tokenize_common(zval * return_value,zend_string * source,zend_long flags,zend_class_entry * token_class)499 static bool tokenize_common(
500 zval *return_value, zend_string *source, zend_long flags, zend_class_entry *token_class)
501 {
502 if (flags & TOKEN_PARSE) {
503 return tokenize_parse(return_value, source, token_class);
504 } else {
505 int success = tokenize(return_value, source, token_class);
506 /* Normal token_get_all() should not throw. */
507 zend_clear_exception();
508 return success;
509 }
510 }
511
512 /* }}} */
513
514 /* {{{ */
PHP_FUNCTION(token_get_all)515 PHP_FUNCTION(token_get_all)
516 {
517 zend_string *source;
518 zend_long flags = 0;
519
520 ZEND_PARSE_PARAMETERS_START(1, 2)
521 Z_PARAM_STR(source)
522 Z_PARAM_OPTIONAL
523 Z_PARAM_LONG(flags)
524 ZEND_PARSE_PARAMETERS_END();
525
526 if (!tokenize_common(return_value, source, flags, /* token_class */ NULL)) {
527 RETURN_THROWS();
528 }
529 }
530 /* }}} */
531
532 /* {{{ */
PHP_FUNCTION(token_name)533 PHP_FUNCTION(token_name)
534 {
535 zend_long type;
536
537 ZEND_PARSE_PARAMETERS_START(1, 1)
538 Z_PARAM_LONG(type)
539 ZEND_PARSE_PARAMETERS_END();
540
541 const char *token_name = get_token_type_name(type);
542 if (!token_name) {
543 token_name = "UNKNOWN";
544 }
545 RETURN_STRING(token_name);
546 }
547 /* }}} */
548
