// Copyright 2021 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef INCLUDE_V8_REGEXP_H_
#define INCLUDE_V8_REGEXP_H_
#include "v8-local-handle.h" // NOLINT(build/include_directory)
#include "v8-object.h" // NOLINT(build/include_directory)
#include "v8config.h" // NOLINT(build/include_directory)
namespace v8 {
class Context;
/**
* An instance of the built-in RegExp constructor (ECMA-262, 15.10).
*/
class V8_EXPORT RegExp : public Object {
public:
/**
* Regular expression flag bits. They can be or'ed to enable a set
* of flags.
* The kLinear value ('l') is experimental and can only be used with
* --enable-experimental-regexp-engine. RegExps with kLinear flag are
* guaranteed to be executed in asymptotic linear time wrt. the length of
* the subject string.
*/
enum Flags {
kNone = 0,
kGlobal = 1 << 0,
kIgnoreCase = 1 << 1,
kMultiline = 1 << 2,
kSticky = 1 << 3,
kUnicode = 1 << 4,
kDotAll = 1 << 5,
kLinear = 1 << 6,
kHasIndices = 1 << 7,
};
static constexpr int kFlagCount = 8;
/**
* Creates a regular expression from the given pattern string and
* the flags bit field. May throw a JavaScript exception as
* described in ECMA-262, 15.10.4.1.
*
* For example,
* RegExp::New(v8::String::New("foo"),
* static_cast<RegExp::Flags>(kGlobal | kMultiline))
* is equivalent to evaluating "/foo/gm".
*/
static V8_WARN_UNUSED_RESULT MaybeLocal<RegExp> New(Local<Context> context,
Local<String> pattern,
Flags flags);
/**
* Like New, but additionally specifies a backtrack limit. If the number of
* backtracks done in one Exec call hits the limit, a match failure is
* immediately returned.
*/
static V8_WARN_UNUSED_RESULT MaybeLocal<RegExp> NewWithBacktrackLimit(
Local<Context> context, Local<String> pattern, Flags flags,
uint32_t backtrack_limit);
/**
* Executes the current RegExp instance on the given subject string.
* Equivalent to RegExp.prototype.exec as described in
*
* https://tc39.es/ecma262/#sec-regexp.prototype.exec
*
* On success, an Array containing the matched strings is returned. On
* failure, returns Null.
*
* Note: modifies global context state, accessible e.g. through RegExp.input.
*/
V8_WARN_UNUSED_RESULT MaybeLocal<Object> Exec(Local<Context> context,
Local<String> subject);
/**
* Returns the value of the source property: a string representing
* the regular expression.
*/
Local<String> GetSource() const;
/**
* Returns the flags bit field.
*/
Flags GetFlags() const;
V8_INLINE static RegExp* Cast(Value* value) {
#ifdef V8_ENABLE_CHECKS
CheckCast(value);
#endif
return static_cast<RegExp*>(value);
}
private:
static void CheckCast(Value* obj);
};
} // namespace v8
#endif // INCLUDE_V8_REGEXP_H_
