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432 lines
13 KiB
C++
432 lines
13 KiB
C++
/**************************************************************************/
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/* regex.cpp */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#include "regex.h"
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#include "regex.compat.inc"
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#include "core/os/memory.h"
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extern "C" {
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#include <pcre2.h>
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}
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static void *_regex_malloc(PCRE2_SIZE size, void *user) {
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return memalloc(size);
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}
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static void _regex_free(void *ptr, void *user) {
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if (ptr) {
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memfree(ptr);
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}
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}
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int RegExMatch::_find(const Variant &p_name) const {
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if (p_name.is_num()) {
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int i = (int)p_name;
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if (i >= data.size()) {
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return -1;
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}
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return i;
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} else if (p_name.is_string()) {
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HashMap<String, int>::ConstIterator found = names.find(p_name);
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if (found) {
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return found->value;
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}
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}
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return -1;
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}
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String RegExMatch::get_subject() const {
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return subject;
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}
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int RegExMatch::get_group_count() const {
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if (data.size() == 0) {
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return 0;
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}
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return data.size() - 1;
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}
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Dictionary RegExMatch::get_names() const {
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Dictionary result;
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for (const KeyValue<String, int> &E : names) {
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result[E.key] = E.value;
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}
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return result;
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}
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PackedStringArray RegExMatch::get_strings() const {
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PackedStringArray result;
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int size = data.size();
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for (int i = 0; i < size; i++) {
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int start = data[i].start;
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if (start == -1) {
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result.append(String());
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continue;
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}
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int length = data[i].end - start;
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result.append(subject.substr(start, length));
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}
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return result;
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}
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String RegExMatch::get_string(const Variant &p_name) const {
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int id = _find(p_name);
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if (id < 0) {
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return String();
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}
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int start = data[id].start;
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if (start == -1) {
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return String();
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}
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int length = data[id].end - start;
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return subject.substr(start, length);
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}
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int RegExMatch::get_start(const Variant &p_name) const {
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int id = _find(p_name);
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if (id < 0) {
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return -1;
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}
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return data[id].start;
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}
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int RegExMatch::get_end(const Variant &p_name) const {
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int id = _find(p_name);
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if (id < 0) {
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return -1;
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}
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return data[id].end;
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}
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void RegExMatch::_bind_methods() {
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ClassDB::bind_method(D_METHOD("get_subject"), &RegExMatch::get_subject);
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ClassDB::bind_method(D_METHOD("get_group_count"), &RegExMatch::get_group_count);
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ClassDB::bind_method(D_METHOD("get_names"), &RegExMatch::get_names);
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ClassDB::bind_method(D_METHOD("get_strings"), &RegExMatch::get_strings);
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ClassDB::bind_method(D_METHOD("get_string", "name"), &RegExMatch::get_string, DEFVAL(0));
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ClassDB::bind_method(D_METHOD("get_start", "name"), &RegExMatch::get_start, DEFVAL(0));
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ClassDB::bind_method(D_METHOD("get_end", "name"), &RegExMatch::get_end, DEFVAL(0));
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ADD_PROPERTY(PropertyInfo(Variant::STRING, "subject"), "", "get_subject");
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ADD_PROPERTY(PropertyInfo(Variant::DICTIONARY, "names"), "", "get_names");
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ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "strings"), "", "get_strings");
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}
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void RegEx::_pattern_info(uint32_t what, void *where) const {
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pcre2_pattern_info_32((pcre2_code_32 *)code, what, where);
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}
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Ref<RegEx> RegEx::create_from_string(const String &p_pattern, bool p_show_error) {
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Ref<RegEx> ret;
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ret.instantiate();
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ret->compile(p_pattern, p_show_error);
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return ret;
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}
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void RegEx::clear() {
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if (code) {
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pcre2_code_free_32((pcre2_code_32 *)code);
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code = nullptr;
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}
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}
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Error RegEx::compile(const String &p_pattern, bool p_show_error) {
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pattern = p_pattern;
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clear();
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int err;
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PCRE2_SIZE offset;
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uint32_t flags = PCRE2_DUPNAMES;
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pcre2_general_context_32 *gctx = (pcre2_general_context_32 *)general_ctx;
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pcre2_compile_context_32 *cctx = pcre2_compile_context_create_32(gctx);
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PCRE2_SPTR32 p = (PCRE2_SPTR32)pattern.get_data();
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code = pcre2_compile_32(p, pattern.length(), flags, &err, &offset, cctx);
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pcre2_compile_context_free_32(cctx);
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if (!code) {
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if (p_show_error) {
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PCRE2_UCHAR32 buf[256];
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pcre2_get_error_message_32(err, buf, 256);
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String message = String::num(offset) + ": " + String((const char32_t *)buf);
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ERR_PRINT(message.utf8());
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}
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return FAILED;
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}
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return OK;
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}
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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);
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ERR_FAIL_COND_V_MSG(p_offset < 0, nullptr, "RegEx search offset must be >= 0");
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Ref<RegExMatch> result = memnew(RegExMatch);
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int length = p_subject.length();
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if (p_end >= 0 && p_end < length) {
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length = p_end;
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}
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pcre2_code_32 *c = (pcre2_code_32 *)code;
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pcre2_general_context_32 *gctx = (pcre2_general_context_32 *)general_ctx;
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pcre2_match_context_32 *mctx = pcre2_match_context_create_32(gctx);
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PCRE2_SPTR32 s = (PCRE2_SPTR32)p_subject.get_data();
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pcre2_match_data_32 *match = pcre2_match_data_create_from_pattern_32(c, gctx);
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int res = pcre2_match_32(c, s, length, p_offset, 0, match, mctx);
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if (res < 0) {
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pcre2_match_data_free_32(match);
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pcre2_match_context_free_32(mctx);
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return nullptr;
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}
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uint32_t size = pcre2_get_ovector_count_32(match);
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PCRE2_SIZE *ovector = pcre2_get_ovector_pointer_32(match);
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result->data.resize(size);
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for (uint32_t i = 0; i < size; i++) {
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result->data.write[i].start = ovector[i * 2];
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result->data.write[i].end = ovector[i * 2 + 1];
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}
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pcre2_match_data_free_32(match);
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pcre2_match_context_free_32(mctx);
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result->subject = p_subject;
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uint32_t count;
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const char32_t *table;
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uint32_t entry_size;
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_pattern_info(PCRE2_INFO_NAMECOUNT, &count);
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_pattern_info(PCRE2_INFO_NAMETABLE, &table);
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_pattern_info(PCRE2_INFO_NAMEENTRYSIZE, &entry_size);
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for (uint32_t i = 0; i < count; i++) {
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char32_t id = table[i * entry_size];
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if (result->data[id].start == -1) {
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continue;
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}
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String name = &table[i * entry_size + 1];
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if (result->names.has(name)) {
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continue;
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}
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result->names.insert(name, id);
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}
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return result;
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}
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TypedArray<RegExMatch> RegEx::search_all(const String &p_subject, int p_offset, int p_end) const {
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ERR_FAIL_COND_V_MSG(p_offset < 0, Array(), "RegEx search offset must be >= 0");
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int last_end = 0;
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TypedArray<RegExMatch> result;
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Ref<RegExMatch> match = search(p_subject, p_offset, p_end);
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while (match.is_valid()) {
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last_end = match->get_end(0);
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if (match->get_start(0) == last_end) {
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last_end++;
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}
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result.push_back(match);
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match = search(p_subject, last_end, p_end);
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}
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return result;
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}
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int RegEx::_sub(const String &p_subject, const String &p_replacement, int p_offset, int p_end, uint32_t p_flags, String &r_output) const {
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// `safety_zone` is the number of chars we allocate in addition to the number of chars expected in order to
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// guard against the PCRE API writing one additional `\0` at the end. PCRE's API docs are unclear on whether
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// PCRE understands outlength in `pcre2_substitute(`) as counting an implicit additional terminating char or
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// not. Always allocating one char more than telling PCRE has us on the safe side.
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const int safety_zone = 1;
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PCRE2_SIZE olength = p_subject.length() + 1; // Space for output string and one terminating `\0` character.
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Vector<char32_t> output;
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output.resize(olength + safety_zone);
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PCRE2_SIZE length = p_subject.length();
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if (p_end >= 0 && (uint32_t)p_end < length) {
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length = p_end;
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}
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pcre2_code_32 *c = (pcre2_code_32 *)code;
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pcre2_general_context_32 *gctx = (pcre2_general_context_32 *)general_ctx;
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pcre2_match_context_32 *mctx = pcre2_match_context_create_32(gctx);
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PCRE2_SPTR32 s = (PCRE2_SPTR32)p_subject.get_data();
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PCRE2_SPTR32 r = (PCRE2_SPTR32)p_replacement.get_data();
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PCRE2_UCHAR32 *o = (PCRE2_UCHAR32 *)output.ptrw();
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pcre2_match_data_32 *match = pcre2_match_data_create_from_pattern_32(c, gctx);
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int res = pcre2_substitute_32(c, s, length, p_offset, p_flags, match, mctx, r, p_replacement.length(), o, &olength);
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if (res == PCRE2_ERROR_NOMEMORY) {
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output.resize(olength + safety_zone);
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o = (PCRE2_UCHAR32 *)output.ptrw();
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res = pcre2_substitute_32(c, s, length, p_offset, p_flags, match, mctx, r, p_replacement.length(), o, &olength);
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}
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pcre2_match_data_free_32(match);
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pcre2_match_context_free_32(mctx);
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if (res >= 0) {
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r_output = String(output.ptr(), olength) + p_subject.substr(length);
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}
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return res;
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}
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String RegEx::sub(const String &p_subject, const String &p_replacement, bool p_all, int p_offset, int p_end) const {
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ERR_FAIL_COND_V(!is_valid(), String());
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ERR_FAIL_COND_V_MSG(p_offset < 0, String(), "RegEx sub offset must be >= 0");
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uint32_t flags = PCRE2_SUBSTITUTE_OVERFLOW_LENGTH | PCRE2_SUBSTITUTE_UNSET_EMPTY;
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if (p_all) {
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flags |= PCRE2_SUBSTITUTE_GLOBAL;
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}
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String output;
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const int res = _sub(p_subject, p_replacement, p_offset, p_end, flags, output);
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if (res < 0) {
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PCRE2_UCHAR32 buf[256];
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pcre2_get_error_message_32(res, buf, 256);
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String message = "PCRE2 Error: " + String((const char32_t *)buf);
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ERR_PRINT(message.utf8());
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if (res == PCRE2_ERROR_NOSUBSTRING) {
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flags |= PCRE2_SUBSTITUTE_UNKNOWN_UNSET;
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_sub(p_subject, p_replacement, p_offset, p_end, flags, output);
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}
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}
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return output;
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}
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bool RegEx::is_valid() const {
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return (code != nullptr);
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}
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String RegEx::get_pattern() const {
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return pattern;
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}
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int RegEx::get_group_count() const {
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ERR_FAIL_COND_V(!is_valid(), 0);
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uint32_t count;
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_pattern_info(PCRE2_INFO_CAPTURECOUNT, &count);
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return count;
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}
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PackedStringArray RegEx::get_names() const {
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PackedStringArray result;
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ERR_FAIL_COND_V(!is_valid(), result);
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uint32_t count;
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const char32_t *table;
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uint32_t entry_size;
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_pattern_info(PCRE2_INFO_NAMECOUNT, &count);
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_pattern_info(PCRE2_INFO_NAMETABLE, &table);
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_pattern_info(PCRE2_INFO_NAMEENTRYSIZE, &entry_size);
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for (uint32_t i = 0; i < count; i++) {
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String name = &table[i * entry_size + 1];
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if (!result.has(name)) {
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result.append(name);
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}
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}
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return result;
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}
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RegEx::RegEx() {
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general_ctx = pcre2_general_context_create_32(&_regex_malloc, &_regex_free, nullptr);
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}
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RegEx::RegEx(const String &p_pattern) {
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general_ctx = pcre2_general_context_create_32(&_regex_malloc, &_regex_free, nullptr);
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compile(p_pattern);
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}
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RegEx::~RegEx() {
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if (code) {
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pcre2_code_free_32((pcre2_code_32 *)code);
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}
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pcre2_general_context_free_32((pcre2_general_context_32 *)general_ctx);
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}
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void RegEx::_bind_methods() {
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ClassDB::bind_static_method("RegEx", D_METHOD("create_from_string", "pattern", "show_error"), &RegEx::create_from_string, DEFVAL(true));
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ClassDB::bind_method(D_METHOD("clear"), &RegEx::clear);
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ClassDB::bind_method(D_METHOD("compile", "pattern", "show_error"), &RegEx::compile, DEFVAL(true));
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ClassDB::bind_method(D_METHOD("search", "subject", "offset", "end"), &RegEx::search, DEFVAL(0), DEFVAL(-1));
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ClassDB::bind_method(D_METHOD("search_all", "subject", "offset", "end"), &RegEx::search_all, DEFVAL(0), DEFVAL(-1));
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ClassDB::bind_method(D_METHOD("sub", "subject", "replacement", "all", "offset", "end"), &RegEx::sub, DEFVAL(false), DEFVAL(0), DEFVAL(-1));
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ClassDB::bind_method(D_METHOD("is_valid"), &RegEx::is_valid);
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ClassDB::bind_method(D_METHOD("get_pattern"), &RegEx::get_pattern);
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ClassDB::bind_method(D_METHOD("get_group_count"), &RegEx::get_group_count);
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ClassDB::bind_method(D_METHOD("get_names"), &RegEx::get_names);
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}
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