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Diffstat (limited to 'base/strings/utf_offset_string_conversions.h')
| -rw-r--r-- | base/strings/utf_offset_string_conversions.h | 126 |
1 files changed, 0 insertions, 126 deletions
diff --git a/base/strings/utf_offset_string_conversions.h b/base/strings/utf_offset_string_conversions.h deleted file mode 100644 index d4494894ef..0000000000 --- a/base/strings/utf_offset_string_conversions.h +++ /dev/null @@ -1,126 +0,0 @@ -// Copyright (c) 2011 The Chromium Authors. All rights reserved. -// Use of this source code is governed by a BSD-style license that can be -// found in the LICENSE file. - -#ifndef BASE_STRINGS_UTF_OFFSET_STRING_CONVERSIONS_H_ -#define BASE_STRINGS_UTF_OFFSET_STRING_CONVERSIONS_H_ - -#include <string> -#include <vector> - -#include "base/base_export.h" -#include "base/strings/string16.h" -#include "base/strings/string_piece.h" - -namespace base { - -// A helper class and associated data structures to adjust offsets into a -// string in response to various adjustments one might do to that string -// (e.g., eliminating a range). For details on offsets, see the comments by -// the AdjustOffsets() function below. -class BASE_EXPORT OffsetAdjuster { - public: - struct BASE_EXPORT Adjustment { - Adjustment(size_t original_offset, - size_t original_length, - size_t output_length); - - size_t original_offset; - size_t original_length; - size_t output_length; - }; - typedef std::vector<Adjustment> Adjustments; - - // Adjusts all offsets in |offsets_for_adjustment| to reflect the adjustments - // recorded in |adjustments|. - // - // Offsets represents insertion/selection points between characters: if |src| - // is "abcd", then 0 is before 'a', 2 is between 'b' and 'c', and 4 is at the - // end of the string. Valid input offsets range from 0 to |src_len|. On - // exit, each offset will have been modified to point at the same logical - // position in the output string. If an offset cannot be successfully - // adjusted (e.g., because it points into the middle of a multibyte sequence), - // it will be set to string16::npos. - static void AdjustOffsets(const Adjustments& adjustments, - std::vector<size_t>* offsets_for_adjustment); - - // Adjusts the single |offset| to reflect the adjustments recorded in - // |adjustments|. - static void AdjustOffset(const Adjustments& adjustments, - size_t* offset); - - // Adjusts all offsets in |offsets_for_unadjustment| to reflect the reverse - // of the adjustments recorded in |adjustments|. In other words, the offsets - // provided represent offsets into an adjusted string and the caller wants - // to know the offsets they correspond to in the original string. If an - // offset cannot be successfully unadjusted (e.g., because it points into - // the middle of a multibyte sequence), it will be set to string16::npos. - static void UnadjustOffsets(const Adjustments& adjustments, - std::vector<size_t>* offsets_for_unadjustment); - - // Adjusts the single |offset| to reflect the reverse of the adjustments - // recorded in |adjustments|. - static void UnadjustOffset(const Adjustments& adjustments, - size_t* offset); - - // Combines two sequential sets of adjustments, storing the combined revised - // adjustments in |adjustments_on_adjusted_string|. That is, suppose a - // string was altered in some way, with the alterations recorded as - // adjustments in |first_adjustments|. Then suppose the resulting string is - // further altered, with the alterations recorded as adjustments scored in - // |adjustments_on_adjusted_string|, with the offsets recorded in these - // adjustments being with respect to the intermediate string. This function - // combines the two sets of adjustments into one, storing the result in - // |adjustments_on_adjusted_string|, whose offsets are correct with respect - // to the original string. - // - // Assumes both parameters are sorted by increasing offset. - // - // WARNING: Only supports |first_adjustments| that involve collapsing ranges - // of text, not expanding ranges. - static void MergeSequentialAdjustments( - const Adjustments& first_adjustments, - Adjustments* adjustments_on_adjusted_string); -}; - -// Like the conversions in utf_string_conversions.h, but also fills in an -// |adjustments| parameter that reflects the alterations done to the string. -// It may be NULL. -BASE_EXPORT bool UTF8ToUTF16WithAdjustments( - const char* src, - size_t src_len, - string16* output, - base::OffsetAdjuster::Adjustments* adjustments); -BASE_EXPORT string16 UTF8ToUTF16WithAdjustments( - const base::StringPiece& utf8, - base::OffsetAdjuster::Adjustments* adjustments); -// As above, but instead internally examines the adjustments and applies them -// to |offsets_for_adjustment|. See comments by AdjustOffsets(). -BASE_EXPORT string16 UTF8ToUTF16AndAdjustOffsets( - const base::StringPiece& utf8, - std::vector<size_t>* offsets_for_adjustment); - -BASE_EXPORT std::string UTF16ToUTF8AndAdjustOffsets( - const base::StringPiece16& utf16, - std::vector<size_t>* offsets_for_adjustment); - -// Limiting function callable by std::for_each which will replace any value -// which is greater than |limit| with npos. Typically this is called with a -// string length to clamp offsets into the string to [0, length] (as opposed to -// [0, length); see comments above). -template <typename T> -struct LimitOffset { - explicit LimitOffset(size_t limit) - : limit_(limit) {} - - void operator()(size_t& offset) { - if (offset > limit_) - offset = T::npos; - } - - size_t limit_; -}; - -} // namespace base - -#endif // BASE_STRINGS_UTF_OFFSET_STRING_CONVERSIONS_H_ |