/* * This file is part of the MicroPython project, http://micropython.org/ * * The MIT License (MIT) * * Copyright (c) 2014 Paul Sokolovsky * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include #include #include #include "py/runtime.h" #include "py/binary.h" #include "py/objstr.h" #include "py/stackctrl.h" #if MICROPY_PY_URE #define re1_5_stack_chk() MP_STACK_CHECK() #include "lib/re1.5/re1.5.h" #define FLAG_DEBUG 0x1000 typedef struct _mp_obj_re_t { mp_obj_base_t base; ByteProg re; } mp_obj_re_t; typedef struct _mp_obj_match_t { mp_obj_base_t base; int num_matches; mp_obj_t str; const char *caps[0]; } mp_obj_match_t; STATIC mp_obj_t mod_re_compile(size_t n_args, const mp_obj_t *args); #if !MICROPY_ENABLE_DYNRUNTIME STATIC const mp_obj_type_t re_type; #endif STATIC void match_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) { (void)kind; mp_obj_match_t *self = MP_OBJ_TO_PTR(self_in); mp_printf(print, "", self->num_matches); } STATIC mp_obj_t match_group(mp_obj_t self_in, mp_obj_t no_in) { mp_obj_match_t *self = MP_OBJ_TO_PTR(self_in); mp_int_t no = mp_obj_get_int(no_in); if (no < 0 || no >= self->num_matches) { mp_raise_type_arg(&mp_type_IndexError, no_in); } const char *start = self->caps[no * 2]; if (start == NULL) { // no match for this group return mp_const_none; } return mp_obj_new_str_of_type(mp_obj_get_type(self->str), (const byte *)start, self->caps[no * 2 + 1] - start); } MP_DEFINE_CONST_FUN_OBJ_2(match_group_obj, match_group); #if MICROPY_PY_URE_MATCH_GROUPS STATIC mp_obj_t match_groups(mp_obj_t self_in) { mp_obj_match_t *self = MP_OBJ_TO_PTR(self_in); if (self->num_matches <= 1) { return mp_const_empty_tuple; } mp_obj_tuple_t *groups = MP_OBJ_TO_PTR(mp_obj_new_tuple(self->num_matches - 1, NULL)); for (int i = 1; i < self->num_matches; ++i) { groups->items[i - 1] = match_group(self_in, MP_OBJ_NEW_SMALL_INT(i)); } return MP_OBJ_FROM_PTR(groups); } MP_DEFINE_CONST_FUN_OBJ_1(match_groups_obj, match_groups); #endif #if MICROPY_PY_URE_MATCH_SPAN_START_END STATIC void match_span_helper(size_t n_args, const mp_obj_t *args, mp_obj_t span[2]) { mp_obj_match_t *self = MP_OBJ_TO_PTR(args[0]); mp_int_t no = 0; if (n_args == 2) { no = mp_obj_get_int(args[1]); if (no < 0 || no >= self->num_matches) { mp_raise_type_arg(&mp_type_IndexError, args[1]); } } mp_int_t s = -1; mp_int_t e = -1; const char *start = self->caps[no * 2]; if (start != NULL) { // have a match for this group const char *begin = mp_obj_str_get_str(self->str); s = start - begin; e = self->caps[no * 2 + 1] - begin; } span[0] = mp_obj_new_int(s); span[1] = mp_obj_new_int(e); } STATIC mp_obj_t match_span(size_t n_args, const mp_obj_t *args) { mp_obj_t span[2]; match_span_helper(n_args, args, span); return mp_obj_new_tuple(2, span); } MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(match_span_obj, 1, 2, match_span); STATIC mp_obj_t match_start(size_t n_args, const mp_obj_t *args) { mp_obj_t span[2]; match_span_helper(n_args, args, span); return span[0]; } MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(match_start_obj, 1, 2, match_start); STATIC mp_obj_t match_end(size_t n_args, const mp_obj_t *args) { mp_obj_t span[2]; match_span_helper(n_args, args, span); return span[1]; } MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(match_end_obj, 1, 2, match_end); #endif #if !MICROPY_ENABLE_DYNRUNTIME STATIC const mp_rom_map_elem_t match_locals_dict_table[] = { { MP_ROM_QSTR(MP_QSTR_group), MP_ROM_PTR(&match_group_obj) }, #if MICROPY_PY_URE_MATCH_GROUPS { MP_ROM_QSTR(MP_QSTR_groups), MP_ROM_PTR(&match_groups_obj) }, #endif #if MICROPY_PY_URE_MATCH_SPAN_START_END { MP_ROM_QSTR(MP_QSTR_span), MP_ROM_PTR(&match_span_obj) }, { MP_ROM_QSTR(MP_QSTR_start), MP_ROM_PTR(&match_start_obj) }, { MP_ROM_QSTR(MP_QSTR_end), MP_ROM_PTR(&match_end_obj) }, #endif }; STATIC MP_DEFINE_CONST_DICT(match_locals_dict, match_locals_dict_table); STATIC const mp_obj_type_t match_type = { { &mp_type_type }, .name = MP_QSTR_match, .print = match_print, .locals_dict = (void *)&match_locals_dict, }; #endif STATIC void re_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) { (void)kind; mp_obj_re_t *self = MP_OBJ_TO_PTR(self_in); mp_printf(print, "", self); } STATIC mp_obj_t ure_exec(bool is_anchored, uint n_args, const mp_obj_t *args) { (void)n_args; mp_obj_re_t *self; if (mp_obj_is_type(args[0], &re_type)) { self = MP_OBJ_TO_PTR(args[0]); } else { self = MP_OBJ_TO_PTR(mod_re_compile(1, args)); } Subject subj; size_t len; subj.begin_line = subj.begin = mp_obj_str_get_data(args[1], &len); subj.end = subj.begin + len; int caps_num = (self->re.sub + 1) * 2; mp_obj_match_t *match = m_new_obj_var(mp_obj_match_t, char *, caps_num); // cast is a workaround for a bug in msvc: it treats const char** as a const pointer instead of a pointer to pointer to const char memset((char *)match->caps, 0, caps_num * sizeof(char *)); int res = re1_5_recursiveloopprog(&self->re, &subj, match->caps, caps_num, is_anchored); if (res == 0) { m_del_var(mp_obj_match_t, char *, caps_num, match); return mp_const_none; } match->base.type = &match_type; match->num_matches = caps_num / 2; // caps_num counts start and end pointers match->str = args[1]; return MP_OBJ_FROM_PTR(match); } STATIC mp_obj_t re_match(size_t n_args, const mp_obj_t *args) { return ure_exec(true, n_args, args); } MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(re_match_obj, 2, 4, re_match); STATIC mp_obj_t re_search(size_t n_args, const mp_obj_t *args) { return ure_exec(false, n_args, args); } MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(re_search_obj, 2, 4, re_search); STATIC mp_obj_t re_split(size_t n_args, const mp_obj_t *args) { mp_obj_re_t *self = MP_OBJ_TO_PTR(args[0]); Subject subj; size_t len; const mp_obj_type_t *str_type = mp_obj_get_type(args[1]); subj.begin_line = subj.begin = mp_obj_str_get_data(args[1], &len); subj.end = subj.begin + len; int caps_num = (self->re.sub + 1) * 2; int maxsplit = 0; if (n_args > 2) { maxsplit = mp_obj_get_int(args[2]); } mp_obj_t retval = mp_obj_new_list(0, NULL); const char **caps = mp_local_alloc(caps_num * sizeof(char *)); while (true) { // cast is a workaround for a bug in msvc: it treats const char** as a const pointer instead of a pointer to pointer to const char memset((char **)caps, 0, caps_num * sizeof(char *)); int res = re1_5_recursiveloopprog(&self->re, &subj, caps, caps_num, false); // if we didn't have a match, or had an empty match, it's time to stop if (!res || caps[0] == caps[1]) { break; } mp_obj_t s = mp_obj_new_str_of_type(str_type, (const byte *)subj.begin, caps[0] - subj.begin); mp_obj_list_append(retval, s); if (self->re.sub > 0) { mp_raise_NotImplementedError(MP_ERROR_TEXT("splitting with sub-captures")); } subj.begin = caps[1]; if (maxsplit > 0 && --maxsplit == 0) { break; } } // cast is a workaround for a bug in msvc (see above) mp_local_free((char **)caps); mp_obj_t s = mp_obj_new_str_of_type(str_type, (const byte *)subj.begin, subj.end - subj.begin); mp_obj_list_append(retval, s); return retval; } MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(re_split_obj, 2, 3, re_split); #if MICROPY_PY_URE_SUB STATIC mp_obj_t re_sub_helper(size_t n_args, const mp_obj_t *args) { mp_obj_re_t *self; if (mp_obj_is_type(args[0], &re_type)) { self = MP_OBJ_TO_PTR(args[0]); } else { self = MP_OBJ_TO_PTR(mod_re_compile(1, args)); } mp_obj_t replace = args[1]; mp_obj_t where = args[2]; mp_int_t count = 0; if (n_args > 3) { count = mp_obj_get_int(args[3]); // Note: flags are currently ignored } size_t where_len; const char *where_str = mp_obj_str_get_data(where, &where_len); Subject subj; subj.begin_line = subj.begin = where_str; subj.end = subj.begin + where_len; int caps_num = (self->re.sub + 1) * 2; vstr_t vstr_return; vstr_return.buf = NULL; // We'll init the vstr after the first match mp_obj_match_t *match = mp_local_alloc(sizeof(mp_obj_match_t) + caps_num * sizeof(char *)); match->base.type = &match_type; match->num_matches = caps_num / 2; // caps_num counts start and end pointers match->str = where; for (;;) { // cast is a workaround for a bug in msvc: it treats const char** as a const pointer instead of a pointer to pointer to const char memset((char *)match->caps, 0, caps_num * sizeof(char *)); int res = re1_5_recursiveloopprog(&self->re, &subj, match->caps, caps_num, false); // If we didn't have a match, or had an empty match, it's time to stop if (!res || match->caps[0] == match->caps[1]) { break; } // Initialise the vstr if it's not already if (vstr_return.buf == NULL) { vstr_init(&vstr_return, match->caps[0] - subj.begin); } // Add pre-match string vstr_add_strn(&vstr_return, subj.begin, match->caps[0] - subj.begin); // Get replacement string const char *repl = mp_obj_str_get_str((mp_obj_is_callable(replace) ? mp_call_function_1(replace, MP_OBJ_FROM_PTR(match)) : replace)); // Append replacement string to result, substituting any regex groups while (*repl != '\0') { if (*repl == '\\') { ++repl; bool is_g_format = false; if (*repl == 'g' && repl[1] == '<') { // Group specified with syntax "\g" repl += 2; is_g_format = true; } if ('0' <= *repl && *repl <= '9') { // Group specified with syntax "\g" or "\number" unsigned int match_no = 0; do { match_no = match_no * 10 + (*repl++ - '0'); } while ('0' <= *repl && *repl <= '9'); if (is_g_format && *repl == '>') { ++repl; } if (match_no >= (unsigned int)match->num_matches) { mp_raise_type_arg(&mp_type_IndexError, MP_OBJ_NEW_SMALL_INT(match_no)); } const char *start_match = match->caps[match_no * 2]; if (start_match != NULL) { // Add the substring matched by group const char *end_match = match->caps[match_no * 2 + 1]; vstr_add_strn(&vstr_return, start_match, end_match - start_match); } } else if (*repl == '\\') { // Add the \ character vstr_add_byte(&vstr_return, *repl++); } } else { // Just add the current byte from the replacement string vstr_add_byte(&vstr_return, *repl++); } } // Move start pointer to end of last match subj.begin = match->caps[1]; // Stop substitutions if count was given and gets to 0 if (count > 0 && --count == 0) { break; } } mp_local_free(match); if (vstr_return.buf == NULL) { // Optimisation for case of no substitutions return where; } // Add post-match string vstr_add_strn(&vstr_return, subj.begin, subj.end - subj.begin); if (mp_obj_get_type(where) == &mp_type_str) { return mp_obj_new_str_from_utf8_vstr(&vstr_return); } else { return mp_obj_new_bytes_from_vstr(&vstr_return); } } MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(re_sub_obj, 3, 5, re_sub_helper); #endif #if !MICROPY_ENABLE_DYNRUNTIME STATIC const mp_rom_map_elem_t re_locals_dict_table[] = { { MP_ROM_QSTR(MP_QSTR_match), MP_ROM_PTR(&re_match_obj) }, { MP_ROM_QSTR(MP_QSTR_search), MP_ROM_PTR(&re_search_obj) }, { MP_ROM_QSTR(MP_QSTR_split), MP_ROM_PTR(&re_split_obj) }, #if MICROPY_PY_URE_SUB { MP_ROM_QSTR(MP_QSTR_sub), MP_ROM_PTR(&re_sub_obj) }, #endif }; STATIC MP_DEFINE_CONST_DICT(re_locals_dict, re_locals_dict_table); STATIC const mp_obj_type_t re_type = { { &mp_type_type }, .name = MP_QSTR_ure, .print = re_print, .locals_dict = (void *)&re_locals_dict, }; #endif STATIC mp_obj_t mod_re_compile(size_t n_args, const mp_obj_t *args) { (void)n_args; const char *re_str = mp_obj_str_get_str(args[0]); int size = re1_5_sizecode(re_str); if (size == -1) { goto error; } mp_obj_re_t *o = mp_obj_malloc_var(mp_obj_re_t, char, size, &re_type); #if MICROPY_PY_URE_DEBUG int flags = 0; if (n_args > 1) { flags = mp_obj_get_int(args[1]); } #endif int error = re1_5_compilecode(&o->re, re_str); if (error != 0) { error: mp_raise_ValueError(MP_ERROR_TEXT("error in regex")); } #if MICROPY_PY_URE_DEBUG if (flags & FLAG_DEBUG) { re1_5_dumpcode(&o->re); } #endif return MP_OBJ_FROM_PTR(o); } MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_re_compile_obj, 1, 2, mod_re_compile); #if !MICROPY_ENABLE_DYNRUNTIME STATIC const mp_rom_map_elem_t mp_module_re_globals_table[] = { { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_ure) }, { MP_ROM_QSTR(MP_QSTR_compile), MP_ROM_PTR(&mod_re_compile_obj) }, { MP_ROM_QSTR(MP_QSTR_match), MP_ROM_PTR(&re_match_obj) }, { MP_ROM_QSTR(MP_QSTR_search), MP_ROM_PTR(&re_search_obj) }, #if MICROPY_PY_URE_SUB { MP_ROM_QSTR(MP_QSTR_sub), MP_ROM_PTR(&re_sub_obj) }, #endif #if MICROPY_PY_URE_DEBUG { MP_ROM_QSTR(MP_QSTR_DEBUG), MP_ROM_INT(FLAG_DEBUG) }, #endif }; STATIC MP_DEFINE_CONST_DICT(mp_module_re_globals, mp_module_re_globals_table); const mp_obj_module_t mp_module_ure = { .base = { &mp_type_module }, .globals = (mp_obj_dict_t *)&mp_module_re_globals, }; MP_REGISTER_MODULE(MP_QSTR_ure, mp_module_ure); #endif // Source files #include'd here to make sure they're compiled in // only if module is enabled by config setting. #define re1_5_fatal(x) assert(!x) #include "lib/re1.5/compilecode.c" #include "lib/re1.5/recursiveloop.c" #include "lib/re1.5/charclass.c" #if MICROPY_PY_URE_DEBUG // Make sure the output print statements go to the same output as other Python output. #define printf(...) mp_printf(&mp_plat_print, __VA_ARGS__) #include "lib/re1.5/dumpcode.c" #undef printf #endif #endif // MICROPY_PY_URE