forked from mirrors/gecko-dev
90 lines
2.8 KiB
C++
90 lines
2.8 KiB
C++
/* -*- 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/. */
|
|
// IWYU pragma: private, include "nsString.h"
|
|
|
|
#ifndef nsTSubstringTuple_h
|
|
#define nsTSubstringTuple_h
|
|
|
|
#include "mozilla/Attributes.h"
|
|
#include "nsTStringRepr.h"
|
|
|
|
/**
|
|
* nsTSubstringTuple
|
|
*
|
|
* Represents a tuple of string fragments. Built as a recursive binary tree.
|
|
* It is used to implement the concatenation of two or more string objects.
|
|
*
|
|
* NOTE: This class is a private implementation detail and should never be
|
|
* referenced outside the string code.
|
|
*/
|
|
template <typename T>
|
|
class MOZ_TEMPORARY_CLASS nsTSubstringTuple {
|
|
public:
|
|
typedef T char_type;
|
|
typedef nsCharTraits<char_type> char_traits;
|
|
|
|
typedef nsTSubstringTuple<T> self_type;
|
|
typedef mozilla::detail::nsTStringRepr<char_type> base_string_type;
|
|
typedef uint32_t size_type;
|
|
|
|
public:
|
|
nsTSubstringTuple(const base_string_type* aStrA,
|
|
const base_string_type* aStrB)
|
|
: mHead(nullptr), mFragA(aStrA), mFragB(aStrB) {}
|
|
|
|
nsTSubstringTuple(const self_type& aHead, const base_string_type* aStrB)
|
|
: mHead(&aHead),
|
|
mFragA(nullptr) // this fragment is ignored when aHead != nullptr
|
|
,
|
|
mFragB(aStrB) {}
|
|
|
|
/**
|
|
* computes the aggregate string length
|
|
*/
|
|
size_type Length() const;
|
|
|
|
/**
|
|
* writes the aggregate string to the given buffer. bufLen is assumed
|
|
* to be equal to or greater than the value returned by the Length()
|
|
* method. the string written to |buf| is not null-terminated.
|
|
*/
|
|
void WriteTo(char_type* aBuf, uint32_t aBufLen) const;
|
|
|
|
/**
|
|
* returns true if this tuple is dependent on (i.e., overlapping with)
|
|
* the given char sequence.
|
|
*/
|
|
bool IsDependentOn(const char_type* aStart, const char_type* aEnd) const;
|
|
|
|
/**
|
|
* returns a pair of the results of IsDependentOn() and Length(). This is more
|
|
* efficient than calling both functions subsequently, as this traverses the
|
|
* tree only once.
|
|
*/
|
|
std::pair<bool, size_type> IsDependentOnWithLength(
|
|
const char_type* aStart, const char_type* aEnd) const;
|
|
|
|
private:
|
|
const self_type* const mHead;
|
|
const base_string_type* const mFragA;
|
|
const base_string_type* const mFragB;
|
|
};
|
|
|
|
template <typename T>
|
|
inline const nsTSubstringTuple<T> operator+(
|
|
const mozilla::detail::nsTStringRepr<T>& aStrA,
|
|
const mozilla::detail::nsTStringRepr<T>& aStrB) {
|
|
return nsTSubstringTuple<T>(&aStrA, &aStrB);
|
|
}
|
|
|
|
template <typename T>
|
|
inline const nsTSubstringTuple<T> operator+(
|
|
const nsTSubstringTuple<T>& aHead,
|
|
const mozilla::detail::nsTStringRepr<T>& aStrB) {
|
|
return nsTSubstringTuple<T>(aHead, &aStrB);
|
|
}
|
|
|
|
#endif
|