mirror of
https://github.com/godotengine/godot
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746dddc067
* Map is unnecessary and inefficient in almost every case. * Replaced by the new HashMap. * Renamed Map to RBMap and Set to RBSet for cases that still make sense (order matters) but use is discouraged. There were very few cases where replacing by HashMap was undesired because keeping the key order was intended. I tried to keep those (as RBMap) as much as possible, but might have missed some. Review appreciated!
393 lines
11 KiB
C++
393 lines
11 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) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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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 "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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memfree(ptr);
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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.get_type() == Variant::STRING) {
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HashMap<String, int>::ConstIterator found = names.find((String)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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Array RegExMatch::get_strings() const {
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Array 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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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) {
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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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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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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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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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Array RegEx::search_all(const String &p_subject, int p_offset, int p_end) const {
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int last_end = -1;
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Array 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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if (last_end == match->get_end(0)) {
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break;
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}
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result.push_back(match);
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last_end = match->get_end(0);
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match = search(p_subject, match->get_end(0), p_end);
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}
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return result;
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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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// 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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uint32_t flags = PCRE2_SUBSTITUTE_OVERFLOW_LENGTH;
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if (p_all) {
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flags |= PCRE2_SUBSTITUTE_GLOBAL;
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}
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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, 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, 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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return String();
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}
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return String(output.ptr(), olength);
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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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Array RegEx::get_names() const {
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Array 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.find(name) < 0) {
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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_method(D_METHOD("clear"), &RegEx::clear);
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ClassDB::bind_method(D_METHOD("compile", "pattern"), &RegEx::compile);
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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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