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/*
* Copyright (c) 2020, Emanuel Sprung <emanuel.sprung@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Types.h>
#include <stdio.h>
#ifdef __serenity__
# include <regex.h>
#else
# include <LibC/regex.h>
#endif
namespace regex {
using FlagsUnderlyingType = u16;
enum class AllFlags {
Global = __Regex_Global, // All matches (don't return after first match)
Insensitive = __Regex_Insensitive, // Case insensitive match (ignores case of [a-zA-Z])
Ungreedy = __Regex_Ungreedy, // The match becomes lazy by default. Now a ? following a quantifier makes it greedy
Unicode = __Regex_Unicode, // Enable all unicode features and interpret all unicode escape sequences as such
Extended = __Regex_Extended, // Ignore whitespaces. Spaces and text after a # in the pattern are ignored
Extra = __Regex_Extra, // Disallow meaningless escapes. A \ followed by a letter with no special meaning is faulted
MatchNotBeginOfLine = __Regex_MatchNotBeginOfLine, // Pattern is not forced to ^ -> search in whole string!
MatchNotEndOfLine = __Regex_MatchNotEndOfLine, // Don't Force the dollar sign, $, to always match end of the string, instead of end of the line. This option is ignored if the Multiline-flag is set
SkipSubExprResults = __Regex_SkipSubExprResults, // Do not return sub expressions in the result
StringCopyMatches = __Regex_StringCopyMatches, // Do explicitly copy results into new allocated string instead of StringView to original string.
SingleLine = __Regex_SingleLine, // Dot matches newline characters
Sticky = __Regex_Sticky, // Force the pattern to only match consecutive matches from where the previous match ended.
Multiline = __Regex_Multiline, // Handle newline characters. Match each line, one by one.
SkipTrimEmptyMatches = __Regex_SkipTrimEmptyMatches, // Do not remove empty capture group results.
Internal_Stateful = __Regex_Internal_Stateful, // Make global matches match one result at a time, and further match() calls on the same instance continue where the previous one left off.
Internal_BrowserExtended = __Regex_Internal_BrowserExtended, // Only for ECMA262, Enable the behaviors defined in section B.1.4. of the ECMA262 spec.
Last = Internal_BrowserExtended,
};
enum class PosixFlags : FlagsUnderlyingType {
Global = (FlagsUnderlyingType)AllFlags::Global,
Insensitive = (FlagsUnderlyingType)AllFlags::Insensitive,
Ungreedy = (FlagsUnderlyingType)AllFlags::Ungreedy,
Unicode = (FlagsUnderlyingType)AllFlags::Unicode,
Extended = (FlagsUnderlyingType)AllFlags::Extended,
Extra = (FlagsUnderlyingType)AllFlags::Extra,
MatchNotBeginOfLine = (FlagsUnderlyingType)AllFlags::MatchNotBeginOfLine,
MatchNotEndOfLine = (FlagsUnderlyingType)AllFlags::MatchNotEndOfLine,
SkipSubExprResults = (FlagsUnderlyingType)AllFlags::SkipSubExprResults,
SkipTrimEmptyMatches = (FlagsUnderlyingType)AllFlags::SkipTrimEmptyMatches,
Multiline = (FlagsUnderlyingType)AllFlags::Multiline,
StringCopyMatches = (FlagsUnderlyingType)AllFlags::StringCopyMatches,
};
enum class ECMAScriptFlags : FlagsUnderlyingType {
Global = (FlagsUnderlyingType)AllFlags::Global | (FlagsUnderlyingType)AllFlags::Internal_Stateful, // Note: ECMAScript "Global" creates a stateful regex.
Insensitive = (FlagsUnderlyingType)AllFlags::Insensitive,
Ungreedy = (FlagsUnderlyingType)AllFlags::Ungreedy,
Unicode = (FlagsUnderlyingType)AllFlags::Unicode,
Extended = (FlagsUnderlyingType)AllFlags::Extended,
Extra = (FlagsUnderlyingType)AllFlags::Extra,
SingleLine = (FlagsUnderlyingType)AllFlags::SingleLine,
Sticky = (FlagsUnderlyingType)AllFlags::Sticky,
Multiline = (FlagsUnderlyingType)AllFlags::Multiline,
StringCopyMatches = (FlagsUnderlyingType)AllFlags::StringCopyMatches,
BrowserExtended = (FlagsUnderlyingType)AllFlags::Internal_BrowserExtended,
};
template<class T>
class RegexOptions {
public:
using FlagsType = T;
RegexOptions() = default;
constexpr RegexOptions(T flags)
: m_flags(flags)
{
}
template<class U>
constexpr RegexOptions(RegexOptions<U> other)
: m_flags((T) static_cast<FlagsUnderlyingType>(other.value()))
{
}
operator bool() const { return !!*this; }
bool operator!() const { return (FlagsUnderlyingType)m_flags == 0; }
constexpr RegexOptions<T> operator|(T flag) const { return RegexOptions<T> { (T)((FlagsUnderlyingType)m_flags | (FlagsUnderlyingType)flag) }; }
constexpr RegexOptions<T> operator&(T flag) const { return RegexOptions<T> { (T)((FlagsUnderlyingType)m_flags & (FlagsUnderlyingType)flag) }; }
constexpr RegexOptions<T>& operator|=(T flag)
{
m_flags = (T)((FlagsUnderlyingType)m_flags | (FlagsUnderlyingType)flag);
return *this;
}
constexpr RegexOptions<T>& operator&=(T flag)
{
m_flags = (T)((FlagsUnderlyingType)m_flags & (FlagsUnderlyingType)flag);
return *this;
}
void reset_flags() { m_flags = (T)0; }
void reset_flag(T flag) { m_flags = (T)((FlagsUnderlyingType)m_flags & ~(FlagsUnderlyingType)flag); }
void set_flag(T flag) { *this |= flag; }
bool has_flag_set(T flag) const { return (FlagsUnderlyingType)flag == ((FlagsUnderlyingType)m_flags & (FlagsUnderlyingType)flag); }
T value() const { return m_flags; }
private:
T m_flags { 0 };
};
template<class T>
constexpr RegexOptions<T> operator|(T lhs, T rhs)
{
return RegexOptions<T> { lhs } |= rhs;
}
template<class T>
constexpr RegexOptions<T> operator&(T lhs, T rhs)
{
return RegexOptions<T> { lhs } &= rhs;
}
template<class T>
constexpr T operator~(T flag)
{
return (T) ~((FlagsUnderlyingType)flag);
}
using AllOptions = RegexOptions<AllFlags>;
using ECMAScriptOptions = RegexOptions<ECMAScriptFlags>;
using PosixOptions = RegexOptions<PosixFlags>;
}
using regex::ECMAScriptFlags;
using regex::ECMAScriptOptions;
using regex::PosixFlags;
using regex::PosixOptions;
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