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circuitpython/extmod/modure.c

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// Copyright (c) 2014 Paul Sokolovsky
// SPDX-FileCopyrightText: 2014 MicroPython & CircuitPython contributors (https://github.com/adafruit/circuitpython/graphs/contributors)
//
// SPDX-License-Identifier: MIT
#include <stdio.h>
#include <assert.h>
#include <string.h>
#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"
#if MICROPY_PY_URE_DEBUG
#define FLAG_DEBUG 0x1000
#endif
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, "<match num=%d>", 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, "<re %p>", 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 = mp_obj_str_get_data(args[1], &len);
subj.end = subj.begin + len;
#if MICROPY_PY_URE_MATCH_SPAN_START_END && !(defined(MICROPY_ENABLE_DYNRUNTIME) && MICROPY_ENABLE_DYNRUNTIME)
if (n_args > 2) {
const mp_obj_type_t *self_type = mp_obj_get_type(args[1]);
mp_int_t str_len = MP_OBJ_SMALL_INT_VALUE(mp_obj_len(args[1]));
const byte *begin = (const byte *)subj.begin;
int pos = mp_obj_get_int(args[2]);
if (pos >= str_len) {
return mp_const_none;
}
if (pos < 0) {
pos = 0;
}
const byte *pos_ptr = str_index_to_ptr(self_type, begin, len, MP_OBJ_NEW_SMALL_INT(pos), true);
const byte *endpos_ptr = (const byte *)subj.end;
if (n_args > 3) {
int endpos = mp_obj_get_int(args[3]);
if (endpos <= pos) {
return mp_const_none;
}
// Will cap to length
endpos_ptr = str_index_to_ptr(self_type, begin, len, args[3], true);
}
subj.begin = (const char *)pos_ptr;
subj.end = (const char *)endpos_ptr;
}
#endif
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 = 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 = 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<number>"
repl += 2;
is_g_format = true;
}
if ('0' <= *repl && *repl <= '9') {
// Group specified with syntax "\g<number>" 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);
return mp_obj_new_str_from_vstr(mp_obj_get_type(where), &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 },
#if CIRCUITPY
.name = MP_QSTR_re,
#else
.name = MP_QSTR_ure,
#endif
.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 = m_new_obj_var(mp_obj_re_t, char, size);
o->base.type = &re_type;
#if MICROPY_PY_URE_DEBUG
int flags = 0;
if (n_args > 1) {
flags = mp_obj_get_int(args[1]);
}
#else
(void)n_args;
#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[] = {
#if CIRCUITPY
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_re) },
#else
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_ure) },
#endif
{ 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_re, mp_module_ure, MICROPY_PY_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
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