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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 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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#ifndef nsTSubstringTuple_h
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#define nsTSubstringTuple_h
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#include "mozilla/Attributes.h"
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#include "nsTStringRepr.h"
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/**
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* nsTSubstringTuple
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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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template <typename T>
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class MOZ_TEMPORARY_CLASS nsTSubstringTuple {
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public:
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typedef T char_type;
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typedef nsCharTraits<char_type> char_traits;
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typedef nsTSubstringTuple<T> self_type;
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typedef mozilla::detail::nsTStringRepr<char_type> base_string_type;
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typedef size_t size_type;
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public:
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nsTSubstringTuple(const base_string_type* aStrA,
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const base_string_type* aStrB)
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: mHead(nullptr), mFragA(aStrA), mFragB(aStrB) {}
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nsTSubstringTuple(const self_type& aHead, 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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* 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, size_type 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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/**
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* returns a pair of the results of IsDependentOn() and Length(). This is more
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* efficient than calling both functions subsequently, as this traverses the
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* tree only once.
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*/
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std::pair<bool, size_type> IsDependentOnWithLength(
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const char_type* aStart, const char_type* aEnd) const;
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private:
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const self_type* const mHead;
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const base_string_type* const mFragA;
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const base_string_type* const mFragB;
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};
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template <typename T>
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inline const nsTSubstringTuple<T> operator+(
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const mozilla::detail::nsTStringRepr<T>& aStrA,
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const mozilla::detail::nsTStringRepr<T>& aStrB) {
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return nsTSubstringTuple<T>(&aStrA, &aStrB);
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}
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template <typename T>
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inline const nsTSubstringTuple<T> operator+(
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const nsTSubstringTuple<T>& aHead,
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const mozilla::detail::nsTStringRepr<T>& aStrB) {
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return nsTSubstringTuple<T>(aHead, &aStrB);
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}
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#endif
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