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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* Regular expression flags. */
#ifndef js_RegExpFlags_h
#define js_RegExpFlags_h
#include "mozilla/Assertions.h" // MOZ_ASSERT
#include "mozilla/Attributes.h" // MOZ_IMPLICIT
#include <stdint.h> // uint8_t
namespace JS {
/**
* Regular expression flag values, suitable for initializing a collection of
* regular expression flags as defined below in |RegExpFlags|. Flags are listed
* in alphabetical order by syntax -- /g, /i, /m, /s, /u, /y.
*/
class RegExpFlag {
// WARNING TO SPIDERMONKEY HACKERS (embedders must assume these values can
// change):
//
// Flag-bit values appear in XDR and structured clone data formats, so none of
// these values can be changed (including to assign values in numerically
// ascending order) unless you also add a translation layer.
public:
/**
* Act globally and find *all* matches (rather than stopping after just the
* first one), i.e. /g.
*/
static constexpr uint8_t Global = 0b00'0010;
/**
* Interpret regular expression source text case-insensitively by folding
* uppercase letters to lowercase, i.e. /i.
*/
static constexpr uint8_t IgnoreCase = 0b00'0001;
/** Treat ^ and $ as begin and end of line, i.e. /m. */
static constexpr uint8_t Multiline = 0b00'0100;
/* Allow . to match newline characters, i.e. /s. */
static constexpr uint8_t DotAll = 0b10'0000;
/** Use Unicode semantics, i.e. /u. */
static constexpr uint8_t Unicode = 0b01'0000;
/** Only match starting from <regular expression>.lastIndex, i.e. /y. */
static constexpr uint8_t Sticky = 0b00'1000;
/** No regular expression flags. */
static constexpr uint8_t NoFlags = 0b00'0000;
/** All regular expression flags. */
static constexpr uint8_t AllFlags = 0b11'1111;
};
/**
* A collection of regular expression flags. Individual flag values may be
* combined into a collection using bitwise operators.
*/
class RegExpFlags {
public:
using Flag = uint8_t;
private:
Flag flags_;
public:
RegExpFlags() = default;
MOZ_IMPLICIT RegExpFlags(Flag flags) : flags_(flags) {
MOZ_ASSERT((flags & RegExpFlag::AllFlags) == flags,
"flags must not contain unrecognized flags");
}
RegExpFlags(const RegExpFlags&) = default;
bool operator==(const RegExpFlags& other) const {
return flags_ == other.flags_;
}
bool operator!=(const RegExpFlags& other) const { return !(*this == other); }
RegExpFlags& operator&=(const RegExpFlags& rhs) {
flags_ &= rhs.flags_;
return *this;
}
RegExpFlags& operator|=(const RegExpFlags& rhs) {
flags_ |= rhs.flags_;
return *this;
}
RegExpFlags operator&(Flag flag) const { return RegExpFlags(flags_ & flag); }
RegExpFlags operator|(Flag flag) const { return RegExpFlags(flags_ | flag); }
RegExpFlags operator^(Flag flag) const { return RegExpFlags(flags_ ^ flag); }
RegExpFlags operator~() const {
return RegExpFlags(~flags_ & RegExpFlag::AllFlags);
}
bool global() const { return flags_ & RegExpFlag::Global; }
bool ignoreCase() const { return flags_ & RegExpFlag::IgnoreCase; }
bool multiline() const { return flags_ & RegExpFlag::Multiline; }
bool dotAll() const { return flags_ & RegExpFlag::DotAll; }
bool unicode() const { return flags_ & RegExpFlag::Unicode; }
bool sticky() const { return flags_ & RegExpFlag::Sticky; }
explicit operator bool() const { return flags_ != 0; }
Flag value() const { return flags_; }
};
inline RegExpFlags& operator&=(RegExpFlags& flags, RegExpFlags::Flag flag) {
flags = flags & flag;
return flags;
}
inline RegExpFlags& operator|=(RegExpFlags& flags, RegExpFlags::Flag flag) {
flags = flags | flag;
return flags;
}
inline RegExpFlags& operator^=(RegExpFlags& flags, RegExpFlags::Flag flag) {
flags = flags ^ flag;
return flags;
}
inline RegExpFlags operator&(const RegExpFlags& lhs, const RegExpFlags& rhs) {
RegExpFlags result = lhs;
result &= rhs;
return lhs;
}
inline RegExpFlags operator|(const RegExpFlags& lhs, const RegExpFlags& rhs) {
RegExpFlags result = lhs;
result |= rhs;
return result;
}
} // namespace JS
#endif // js_RegExpFlags_h
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