godot/modules/regex/regex.cpp

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/*************************************************************************/
/* regex.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* 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 "regex.h"
#include "core/os/memory.h"
extern "C" {
#include <pcre2.h>
}
static void *_regex_malloc(PCRE2_SIZE size, void *user) {
return memalloc(size);
}
static void _regex_free(void *ptr, void *user) {
memfree(ptr);
}
int RegExMatch::_find(const Variant &p_name) const {
if (p_name.is_num()) {
int i = (int)p_name;
if (i >= data.size()) {
return -1;
}
return i;
} else if (p_name.get_type() == Variant::STRING) {
HashMap<String, int>::ConstIterator found = names.find((String)p_name);
if (found) {
return found->value;
}
}
return -1;
}
String RegExMatch::get_subject() const {
return subject;
}
int RegExMatch::get_group_count() const {
if (data.size() == 0) {
return 0;
}
return data.size() - 1;
}
Dictionary RegExMatch::get_names() const {
Dictionary result;
for (const KeyValue<String, int> &E : names) {
result[E.key] = E.value;
}
return result;
}
Array RegExMatch::get_strings() const {
Array result;
int size = data.size();
for (int i = 0; i < size; i++) {
int start = data[i].start;
if (start == -1) {
result.append(String());
continue;
}
int length = data[i].end - start;
result.append(subject.substr(start, length));
}
return result;
}
String RegExMatch::get_string(const Variant &p_name) const {
int id = _find(p_name);
if (id < 0) {
return String();
}
int start = data[id].start;
if (start == -1) {
return String();
}
int length = data[id].end - start;
return subject.substr(start, length);
}
int RegExMatch::get_start(const Variant &p_name) const {
int id = _find(p_name);
if (id < 0) {
return -1;
}
return data[id].start;
}
int RegExMatch::get_end(const Variant &p_name) const {
int id = _find(p_name);
if (id < 0) {
return -1;
}
return data[id].end;
}
void RegExMatch::_bind_methods() {
ClassDB::bind_method(D_METHOD("get_subject"), &RegExMatch::get_subject);
ClassDB::bind_method(D_METHOD("get_group_count"), &RegExMatch::get_group_count);
ClassDB::bind_method(D_METHOD("get_names"), &RegExMatch::get_names);
ClassDB::bind_method(D_METHOD("get_strings"), &RegExMatch::get_strings);
ClassDB::bind_method(D_METHOD("get_string", "name"), &RegExMatch::get_string, DEFVAL(0));
ClassDB::bind_method(D_METHOD("get_start", "name"), &RegExMatch::get_start, DEFVAL(0));
ClassDB::bind_method(D_METHOD("get_end", "name"), &RegExMatch::get_end, DEFVAL(0));
ADD_PROPERTY(PropertyInfo(Variant::STRING, "subject"), "", "get_subject");
ADD_PROPERTY(PropertyInfo(Variant::DICTIONARY, "names"), "", "get_names");
ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "strings"), "", "get_strings");
}
void RegEx::_pattern_info(uint32_t what, void *where) const {
pcre2_pattern_info_32((pcre2_code_32 *)code, what, where);
}
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Ref<RegEx> RegEx::create_from_string(const String &p_pattern) {
Ref<RegEx> ret;
ret.instantiate();
ret->compile(p_pattern);
return ret;
}
void RegEx::clear() {
if (code) {
pcre2_code_free_32((pcre2_code_32 *)code);
code = nullptr;
}
}
Error RegEx::compile(const String &p_pattern) {
pattern = p_pattern;
clear();
int err;
PCRE2_SIZE offset;
uint32_t flags = PCRE2_DUPNAMES;
pcre2_general_context_32 *gctx = (pcre2_general_context_32 *)general_ctx;
pcre2_compile_context_32 *cctx = pcre2_compile_context_create_32(gctx);
PCRE2_SPTR32 p = (PCRE2_SPTR32)pattern.get_data();
code = pcre2_compile_32(p, pattern.length(), flags, &err, &offset, cctx);
pcre2_compile_context_free_32(cctx);
if (!code) {
PCRE2_UCHAR32 buf[256];
pcre2_get_error_message_32(err, buf, 256);
String message = String::num(offset) + ": " + String((const char32_t *)buf);
ERR_PRINT(message.utf8());
return FAILED;
}
return OK;
}
Ref<RegExMatch> RegEx::search(const String &p_subject, int p_offset, int p_end) const {
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ERR_FAIL_COND_V(!is_valid(), nullptr);
ERR_FAIL_COND_V_MSG(p_offset < 0, nullptr, "RegEx search offset must be >= 0");
Ref<RegExMatch> result = memnew(RegExMatch);
int length = p_subject.length();
if (p_end >= 0 && p_end < length) {
length = p_end;
}
pcre2_code_32 *c = (pcre2_code_32 *)code;
pcre2_general_context_32 *gctx = (pcre2_general_context_32 *)general_ctx;
pcre2_match_context_32 *mctx = pcre2_match_context_create_32(gctx);
PCRE2_SPTR32 s = (PCRE2_SPTR32)p_subject.get_data();
pcre2_match_data_32 *match = pcre2_match_data_create_from_pattern_32(c, gctx);
int res = pcre2_match_32(c, s, length, p_offset, 0, match, mctx);
if (res < 0) {
pcre2_match_data_free_32(match);
pcre2_match_context_free_32(mctx);
return nullptr;
}
uint32_t size = pcre2_get_ovector_count_32(match);
PCRE2_SIZE *ovector = pcre2_get_ovector_pointer_32(match);
result->data.resize(size);
for (uint32_t i = 0; i < size; i++) {
result->data.write[i].start = ovector[i * 2];
result->data.write[i].end = ovector[i * 2 + 1];
}
pcre2_match_data_free_32(match);
pcre2_match_context_free_32(mctx);
result->subject = p_subject;
uint32_t count;
const char32_t *table;
uint32_t entry_size;
_pattern_info(PCRE2_INFO_NAMECOUNT, &count);
_pattern_info(PCRE2_INFO_NAMETABLE, &table);
_pattern_info(PCRE2_INFO_NAMEENTRYSIZE, &entry_size);
for (uint32_t i = 0; i < count; i++) {
char32_t id = table[i * entry_size];
if (result->data[id].start == -1) {
continue;
}
String name = &table[i * entry_size + 1];
if (result->names.has(name)) {
continue;
}
result->names.insert(name, id);
}
return result;
}
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TypedArray<RegExMatch> RegEx::search_all(const String &p_subject, int p_offset, int p_end) const {
ERR_FAIL_COND_V_MSG(p_offset < 0, Array(), "RegEx search offset must be >= 0");
int last_end = -1;
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TypedArray<RegExMatch> result;
Ref<RegExMatch> match = search(p_subject, p_offset, p_end);
while (match.is_valid()) {
if (last_end == match->get_end(0)) {
break;
}
result.push_back(match);
last_end = match->get_end(0);
match = search(p_subject, match->get_end(0), p_end);
}
return result;
}
String RegEx::sub(const String &p_subject, const String &p_replacement, bool p_all, int p_offset, int p_end) const {
ERR_FAIL_COND_V(!is_valid(), String());
ERR_FAIL_COND_V_MSG(p_offset < 0, String(), "RegEx sub offset must be >= 0");
// safety_zone is the number of chars we allocate in addition to the number of chars expected in order to
// guard against the PCRE API writing one additional \0 at the end. PCRE's API docs are unclear on whether
// PCRE understands outlength in pcre2_substitute() as counting an implicit additional terminating char or
// not. always allocating one char more than telling PCRE has us on the safe side.
const int safety_zone = 1;
PCRE2_SIZE olength = p_subject.length() + 1; // space for output string and one terminating \0 character
Vector<char32_t> output;
output.resize(olength + safety_zone);
uint32_t flags = PCRE2_SUBSTITUTE_OVERFLOW_LENGTH;
if (p_all) {
flags |= PCRE2_SUBSTITUTE_GLOBAL;
}
PCRE2_SIZE length = p_subject.length();
if (p_end >= 0 && (uint32_t)p_end < length) {
length = p_end;
}
pcre2_code_32 *c = (pcre2_code_32 *)code;
pcre2_general_context_32 *gctx = (pcre2_general_context_32 *)general_ctx;
pcre2_match_context_32 *mctx = pcre2_match_context_create_32(gctx);
PCRE2_SPTR32 s = (PCRE2_SPTR32)p_subject.get_data();
PCRE2_SPTR32 r = (PCRE2_SPTR32)p_replacement.get_data();
PCRE2_UCHAR32 *o = (PCRE2_UCHAR32 *)output.ptrw();
pcre2_match_data_32 *match = pcre2_match_data_create_from_pattern_32(c, gctx);
int res = pcre2_substitute_32(c, s, length, p_offset, flags, match, mctx, r, p_replacement.length(), o, &olength);
if (res == PCRE2_ERROR_NOMEMORY) {
output.resize(olength + safety_zone);
o = (PCRE2_UCHAR32 *)output.ptrw();
res = pcre2_substitute_32(c, s, length, p_offset, flags, match, mctx, r, p_replacement.length(), o, &olength);
}
pcre2_match_data_free_32(match);
pcre2_match_context_free_32(mctx);
if (res < 0) {
return String();
}
return String(output.ptr(), olength);
}
bool RegEx::is_valid() const {
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return (code != nullptr);
}
String RegEx::get_pattern() const {
return pattern;
}
int RegEx::get_group_count() const {
ERR_FAIL_COND_V(!is_valid(), 0);
uint32_t count;
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_pattern_info(PCRE2_INFO_CAPTURECOUNT, &count);
return count;
}
Array RegEx::get_names() const {
Array result;
ERR_FAIL_COND_V(!is_valid(), result);
uint32_t count;
const char32_t *table;
uint32_t entry_size;
_pattern_info(PCRE2_INFO_NAMECOUNT, &count);
_pattern_info(PCRE2_INFO_NAMETABLE, &table);
_pattern_info(PCRE2_INFO_NAMEENTRYSIZE, &entry_size);
for (uint32_t i = 0; i < count; i++) {
String name = &table[i * entry_size + 1];
if (result.find(name) < 0) {
result.append(name);
}
}
return result;
}
RegEx::RegEx() {
general_ctx = pcre2_general_context_create_32(&_regex_malloc, &_regex_free, nullptr);
}
RegEx::RegEx(const String &p_pattern) {
general_ctx = pcre2_general_context_create_32(&_regex_malloc, &_regex_free, nullptr);
compile(p_pattern);
}
RegEx::~RegEx() {
if (code) {
pcre2_code_free_32((pcre2_code_32 *)code);
}
pcre2_general_context_free_32((pcre2_general_context_32 *)general_ctx);
}
void RegEx::_bind_methods() {
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ClassDB::bind_static_method("RegEx", D_METHOD("create_from_string", "pattern"), &RegEx::create_from_string);
ClassDB::bind_method(D_METHOD("clear"), &RegEx::clear);
ClassDB::bind_method(D_METHOD("compile", "pattern"), &RegEx::compile);
ClassDB::bind_method(D_METHOD("search", "subject", "offset", "end"), &RegEx::search, DEFVAL(0), DEFVAL(-1));
ClassDB::bind_method(D_METHOD("search_all", "subject", "offset", "end"), &RegEx::search_all, DEFVAL(0), DEFVAL(-1));
ClassDB::bind_method(D_METHOD("sub", "subject", "replacement", "all", "offset", "end"), &RegEx::sub, DEFVAL(false), DEFVAL(0), DEFVAL(-1));
ClassDB::bind_method(D_METHOD("is_valid"), &RegEx::is_valid);
ClassDB::bind_method(D_METHOD("get_pattern"), &RegEx::get_pattern);
ClassDB::bind_method(D_METHOD("get_group_count"), &RegEx::get_group_count);
ClassDB::bind_method(D_METHOD("get_names"), &RegEx::get_names);
}