d95794ec8a
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see".
404 lines
12 KiB
C++
404 lines
12 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 "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 || p_name.get_type() == Variant::STRING_NAME) {
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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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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) {
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Ref<RegEx> ret;
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ret.instantiate();
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ret->compile(p_pattern);
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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) {
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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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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 = -1;
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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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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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ERR_FAIL_COND_V_MSG(p_offset < 0, String(), "RegEx sub offset must be >= 0");
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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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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.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_static_method("RegEx", D_METHOD("create_from_string", "pattern"), &RegEx::create_from_string);
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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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