gecko/xpcom/string/public/nsTSubstringTuple.h

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//* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
2012-05-21 04:12:37 -07:00
/* 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/. */
/**
* nsTSubstringTuple_CharT
*
* 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.
*/
class nsTSubstringTuple_CharT
{
public:
typedef CharT char_type;
typedef nsCharTraits<char_type> char_traits;
typedef nsTSubstringTuple_CharT self_type;
typedef nsTSubstring_CharT substring_type;
typedef nsTSubstring_CharT base_string_type;
typedef PRUint32 size_type;
public:
nsTSubstringTuple_CharT(const base_string_type* a, const base_string_type* b)
: mHead(nsnull)
, mFragA(a)
, mFragB(b) {}
nsTSubstringTuple_CharT(const self_type& head, const base_string_type* b)
: mHead(&head)
, mFragA(nsnull) // this fragment is ignored when head != nsnull
, mFragB(b) {}
/**
* 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 *buf, PRUint32 bufLen) const;
/**
* returns true if this tuple is dependent on (i.e., overlapping with)
* the given char sequence.
*/
bool IsDependentOn(const char_type *start, const char_type *end) const;
private:
const self_type* mHead;
const base_string_type* mFragA;
const base_string_type* mFragB;
};
inline
const nsTSubstringTuple_CharT
operator+(const nsTSubstringTuple_CharT::base_string_type& a, const nsTSubstringTuple_CharT::base_string_type& b)
{
return nsTSubstringTuple_CharT(&a, &b);
}
inline
const nsTSubstringTuple_CharT
operator+(const nsTSubstringTuple_CharT& head, const nsTSubstringTuple_CharT::base_string_type& b)
{
return nsTSubstringTuple_CharT(head, &b);
}