94 lines
3.3 KiB
C
94 lines
3.3 KiB
C
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_STRINGS_UTF_OFFSET_STRING_CONVERSIONS_H_
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#define BASE_STRINGS_UTF_OFFSET_STRING_CONVERSIONS_H_
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#include <string>
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#include <vector>
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#include "base/base_export.h"
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#include "base/strings/string16.h"
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#include "base/strings/string_piece.h"
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namespace base {
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// Like the conversions in utf_string_conversions.h, but also takes one or more
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// offsets (|offset[s]_for_adjustment|) into the source strings, each offset
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// will be adjusted to point at the same logical place in the result strings.
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// If this isn't possible because an offset points past the end of the source
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// strings or into the middle of a multibyte sequence, the offending offset will
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// be set to string16::npos. |offset[s]_for_adjustment| may be NULL.
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BASE_EXPORT bool UTF8ToUTF16AndAdjustOffset(const char* src,
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size_t src_len,
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string16* output,
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size_t* offset_for_adjustment);
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BASE_EXPORT bool UTF8ToUTF16AndAdjustOffsets(
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const char* src,
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size_t src_len,
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string16* output,
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std::vector<size_t>* offsets_for_adjustment);
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BASE_EXPORT string16 UTF8ToUTF16AndAdjustOffset(const base::StringPiece& utf8,
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size_t* offset_for_adjustment);
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BASE_EXPORT string16 UTF8ToUTF16AndAdjustOffsets(
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const base::StringPiece& utf8,
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std::vector<size_t>* offsets_for_adjustment);
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BASE_EXPORT std::string UTF16ToUTF8AndAdjustOffset(
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const base::StringPiece16& utf16,
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size_t* offset_for_adjustment);
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BASE_EXPORT std::string UTF16ToUTF8AndAdjustOffsets(
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const base::StringPiece16& utf16,
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std::vector<size_t>* offsets_for_adjustment);
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// Limiting function callable by std::for_each which will replace any value
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// which is equal to or greater than |limit| with npos.
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template <typename T>
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struct LimitOffset {
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explicit LimitOffset(size_t limit)
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: limit_(limit) {}
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void operator()(size_t& offset) {
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if (offset >= limit_)
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offset = T::npos;
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}
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size_t limit_;
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};
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// Stack object which, on destruction, will update a vector of offsets based on
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// any supplied adjustments. To use, declare one of these, providing the
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// address of the offset vector to adjust. Then Add() any number of Adjustments
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// (each Adjustment gives the |original_offset| of a substring and the lengths
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// of the substring before and after transforming). When the OffsetAdjuster
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// goes out of scope, all the offsets in the provided vector will be updated.
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class BASE_EXPORT OffsetAdjuster {
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public:
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struct BASE_EXPORT Adjustment {
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Adjustment(size_t original_offset,
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size_t original_length,
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size_t output_length);
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size_t original_offset;
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size_t original_length;
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size_t output_length;
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};
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explicit OffsetAdjuster(std::vector<size_t>* offsets_for_adjustment);
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~OffsetAdjuster();
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void Add(const Adjustment& adjustment);
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private:
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void AdjustOffset(std::vector<size_t>::iterator offset);
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std::vector<size_t>* offsets_for_adjustment_;
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std::vector<Adjustment> adjustments_;
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};
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} // namespace base
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#endif // BASE_STRINGS_UTF_OFFSET_STRING_CONVERSIONS_H_
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