53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
// Scintilla source code edit control
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/** @file UniqueString.cxx
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** Define an allocator for UniqueString.
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**/
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// Copyright 2017 by Neil Hodgson <neilh@scintilla.org>
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// The License.txt file describes the conditions under which this software may be distributed.
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#include <string_view>
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#include <vector>
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#include <algorithm>
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#include <memory>
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#include "UniqueString.h"
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namespace Scintilla::Internal {
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/// Equivalent to strdup but produces a std::unique_ptr<const char[]> allocation to go
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/// into collections.
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UniqueString UniqueStringCopy(const char *text) {
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if (!text) {
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return UniqueString();
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}
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const std::string_view sv(text);
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std::unique_ptr<char[]> upcNew = std::make_unique<char[]>(sv.length() + 1);
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sv.copy(upcNew.get(), sv.length());
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return UniqueString(upcNew.release());
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}
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// A set of strings that always returns the same pointer for each string.
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UniqueStringSet::UniqueStringSet() = default;
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void UniqueStringSet::Clear() noexcept {
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strings.clear();
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}
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const char *UniqueStringSet::Save(const char *text) {
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if (!text)
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return nullptr;
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const std::string_view sv(text);
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for (const UniqueString &us : strings) {
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if (sv == us.get()) {
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return us.get();
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}
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}
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strings.push_back(UniqueStringCopy(text));
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return strings.back().get();
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}
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}
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