84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// IWYU pragma: private, include "nsString.h"
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/**
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* nsTSubstringTuple_CharT
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*
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* Represents a tuple of string fragments. Built as a recursive binary tree.
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* It is used to implement the concatenation of two or more string objects.
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*
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* NOTE: This class is a private implementation detail and should never be
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* referenced outside the string code.
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*/
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class nsTSubstringTuple_CharT
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{
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public:
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typedef CharT char_type;
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typedef nsCharTraits<char_type> char_traits;
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typedef nsTSubstringTuple_CharT self_type;
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typedef nsTSubstring_CharT substring_type;
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typedef nsTSubstring_CharT base_string_type;
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typedef uint32_t size_type;
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public:
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nsTSubstringTuple_CharT(const base_string_type* aStrA,
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const base_string_type* aStrB)
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: mHead(nullptr)
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, mFragA(aStrA)
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, mFragB(aStrB)
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{
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}
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nsTSubstringTuple_CharT(const self_type& aHead,
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const base_string_type* aStrB)
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: mHead(&aHead)
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, mFragA(nullptr) // this fragment is ignored when aHead != nullptr
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, mFragB(aStrB)
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{
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}
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/**
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* computes the aggregate string length
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*/
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size_type Length() const;
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/**
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* writes the aggregate string to the given buffer. bufLen is assumed
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* to be equal to or greater than the value returned by the Length()
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* method. the string written to |buf| is not null-terminated.
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*/
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void WriteTo(char_type* aBuf, uint32_t aBufLen) const;
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/**
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* returns true if this tuple is dependent on (i.e., overlapping with)
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* the given char sequence.
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*/
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bool IsDependentOn(const char_type* aStart, const char_type* aEnd) const;
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private:
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const self_type* mHead;
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const base_string_type* mFragA;
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const base_string_type* mFragB;
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};
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inline const nsTSubstringTuple_CharT
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operator+(const nsTSubstringTuple_CharT::base_string_type& aStrA,
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const nsTSubstringTuple_CharT::base_string_type& aStrB)
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{
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return nsTSubstringTuple_CharT(&aStrA, &aStrB);
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}
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inline const nsTSubstringTuple_CharT
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operator+(const nsTSubstringTuple_CharT& aHead,
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const nsTSubstringTuple_CharT::base_string_type& aStrB)
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{
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return nsTSubstringTuple_CharT(aHead, &aStrB);
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}
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