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/*
* Copyright (c) 2020, Emanuel Sprung <emanuel.sprung@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "RegexByteCode.h"
#include "RegexMatch.h"
#include "RegexOptions.h"
#include "RegexParser.h"
#include <AK/Forward.h>
#include <AK/HashMap.h>
#include <AK/NonnullOwnPtrVector.h>
#include <AK/Types.h>
#include <AK/Utf32View.h>
#include <AK/Vector.h>
#include <ctype.h>
#include <stdio.h>
namespace regex {
static const constexpr size_t c_max_recursion = 5000;
static const constexpr size_t c_match_preallocation_count = 0;
struct RegexResult final {
bool success { false };
size_t count { 0 };
Vector<Match> matches;
Vector<Vector<Match>> capture_group_matches;
Vector<HashMap<String, Match>> named_capture_group_matches;
size_t n_operations { 0 };
size_t n_capture_groups { 0 };
size_t n_named_capture_groups { 0 };
};
template<class Parser>
class Regex;
template<class Parser>
class Matcher final {
public:
Matcher(const Regex<Parser>& pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
: m_pattern(pattern)
, m_regex_options(regex_options.value_or({}))
{
}
~Matcher() = default;
RegexResult match(const RegexStringView&, Optional<typename ParserTraits<Parser>::OptionsType> = {}) const;
RegexResult match(const Vector<RegexStringView>, Optional<typename ParserTraits<Parser>::OptionsType> = {}) const;
typename ParserTraits<Parser>::OptionsType options() const
{
return m_regex_options;
}
private:
Optional<bool> execute(const MatchInput& input, MatchState& state, MatchOutput& output, size_t recursion_level) const;
ALWAYS_INLINE Optional<bool> execute_low_prio_forks(const MatchInput& input, MatchState& original_state, MatchOutput& output, Vector<MatchState> states, size_t recursion_level) const;
const Regex<Parser>& m_pattern;
const typename ParserTraits<Parser>::OptionsType m_regex_options;
};
template<class Parser>
class Regex final {
public:
String pattern_value;
regex::Parser::Result parser_result;
OwnPtr<Matcher<Parser>> matcher { nullptr };
mutable size_t start_offset { 0 };
explicit Regex(StringView pattern, typename ParserTraits<Parser>::OptionsType regex_options = {});
~Regex() = default;
typename ParserTraits<Parser>::OptionsType options() const;
void print_bytecode(FILE* f = stdout) const;
String error_string(Optional<String> message = {}) const;
RegexResult match(const RegexStringView view, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
if (!matcher || parser_result.error != Error::NoError)
return {};
return matcher->match(view, regex_options);
}
RegexResult match(const Vector<RegexStringView> views, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
if (!matcher || parser_result.error != Error::NoError)
return {};
return matcher->match(views, regex_options);
}
String replace(const RegexStringView view, const StringView& replacement_pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
if (!matcher || parser_result.error != Error::NoError)
return {};
StringBuilder builder;
size_t start_offset = 0;
RegexResult result = matcher->match(view, regex_options);
if (!result.success)
return view.to_string();
for (size_t i = 0; i < result.matches.size(); ++i) {
auto& match = result.matches[i];
builder.append(view.substring_view(start_offset, match.global_offset - start_offset).to_string());
start_offset = match.global_offset + match.view.length();
GenericLexer lexer(replacement_pattern);
while (!lexer.is_eof()) {
if (lexer.consume_specific('\\')) {
if (lexer.consume_specific('\\')) {
builder.append('\\');
continue;
}
auto number = lexer.consume_while(isdigit);
if (auto index = number.to_uint(); index.has_value() && result.n_capture_groups >= index.value()) {
builder.append(result.capture_group_matches[i][index.value() - 1].view.to_string());
} else {
builder.appendff("\\{}", number);
}
} else {
builder.append(lexer.consume_while([](auto ch) { return ch != '\\'; }));
}
}
}
builder.append(view.substring_view(start_offset, view.length() - start_offset).to_string());
return builder.to_string();
}
// FIXME: replace(const Vector<RegexStringView>, ...)
RegexResult search(const RegexStringView view, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
if (!matcher || parser_result.error != Error::NoError)
return {};
AllOptions options = (AllOptions)regex_options.value_or({});
if ((options & AllFlags::MatchNotBeginOfLine) && (options & AllFlags::MatchNotEndOfLine)) {
options.reset_flag(AllFlags::MatchNotEndOfLine);
options.reset_flag(AllFlags::MatchNotBeginOfLine);
}
options |= AllFlags::Global;
return matcher->match(view, options);
}
RegexResult search(const Vector<RegexStringView> views, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
if (!matcher || parser_result.error != Error::NoError)
return {};
AllOptions options = (AllOptions)regex_options.value_or({});
if ((options & AllFlags::MatchNotBeginOfLine) && (options & AllFlags::MatchNotEndOfLine)) {
options.reset_flag(AllFlags::MatchNotEndOfLine);
options.reset_flag(AllFlags::MatchNotBeginOfLine);
}
options |= AllFlags::Global;
return matcher->match(views, options);
}
bool match(const RegexStringView view, RegexResult& m, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
m = match(view, regex_options);
return m.success;
}
bool match(const Vector<RegexStringView> views, RegexResult& m, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
m = match(views, regex_options);
return m.success;
}
bool search(const RegexStringView view, RegexResult& m, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
m = search(view, regex_options);
return m.success;
}
bool search(const Vector<RegexStringView> views, RegexResult& m, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
m = search(views, regex_options);
return m.success;
}
bool has_match(const RegexStringView view, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
if (!matcher || parser_result.error != Error::NoError)
return false;
RegexResult result = matcher->match(view, AllOptions { regex_options.value_or({}) } | AllFlags::SkipSubExprResults);
return result.success;
}
bool has_match(const Vector<RegexStringView> views, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
if (!matcher || parser_result.error != Error::NoError)
return false;
RegexResult result = matcher->match(views, AllOptions { regex_options.value_or({}) } | AllFlags::SkipSubExprResults);
return result.success;
}
};
// free standing functions for match, search and has_match
template<class Parser>
RegexResult match(const RegexStringView view, Regex<Parser>& pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.match(view, regex_options);
}
template<class Parser>
RegexResult match(const Vector<RegexStringView> view, Regex<Parser>& pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.match(view, regex_options);
}
template<class Parser>
bool match(const RegexStringView view, Regex<Parser>& pattern, RegexResult&, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.match(view, regex_options);
}
template<class Parser>
bool match(const Vector<RegexStringView> view, Regex<Parser>& pattern, RegexResult&, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.match(view, regex_options);
}
template<class Parser>
RegexResult search(const RegexStringView view, Regex<Parser>& pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.search(view, regex_options);
}
template<class Parser>
RegexResult search(const Vector<RegexStringView> views, Regex<Parser>& pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.search(views, regex_options);
}
template<class Parser>
bool search(const RegexStringView view, Regex<Parser>& pattern, RegexResult&, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.search(view, regex_options);
}
template<class Parser>
bool search(const Vector<RegexStringView> views, Regex<Parser>& pattern, RegexResult&, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.search(views, regex_options);
}
template<class Parser>
bool has_match(const RegexStringView view, Regex<Parser>& pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.has_match(view, regex_options);
}
template<class Parser>
bool has_match(const Vector<RegexStringView> views, Regex<Parser>& pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.has_match(views, regex_options);
}
}
using regex::has_match;
using regex::match;
using regex::Regex;
using regex::RegexResult;
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