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// Copyright 2012 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.
#include "ui/gfx/text_utils.h"
#include "base/i18n/char_iterator.h"
#include "base/logging.h"
#include "base/numerics/safe_conversions.h"
#include "third_party/icu/source/common/unicode/uchar.h"
#include "third_party/icu/source/common/unicode/utf16.h"
namespace gfx {
namespace {
// Returns true if the code point |c| is a combining mark character in Unicode.
bool CharIsMark(UChar32 c) {
int8_t char_type = u_charType(c);
return char_type == U_NON_SPACING_MARK || char_type == U_ENCLOSING_MARK ||
char_type == U_COMBINING_SPACING_MARK;
}
// Gets the code point of |str| at the given code unit position |index|. If
// |index| is a surrogate code unit, returns the whole code point (unless the
// code unit is unpaired, in which case it just returns the surrogate value).
UChar32 GetCodePointAt(const base::string16& str, size_t index) {
UChar32 c;
U16_GET(str.data(), 0, index, str.size(), c);
return c;
}
} // namespace
base::string16 RemoveAcceleratorChar(const base::string16& s,
base::char16 accelerator_char,
int* accelerated_char_pos,
int* accelerated_char_span) {
bool escaped = false;
ptrdiff_t last_char_pos = -1;
int last_char_span = 0;
base::i18n::UTF16CharIterator chars(&s);
base::string16 accelerator_removed;
accelerator_removed.reserve(s.size());
while (!chars.end()) {
int32 c = chars.get();
int array_pos = chars.array_pos();
chars.Advance();
if (c != accelerator_char || escaped) {
int span = chars.array_pos() - array_pos;
if (escaped && c != accelerator_char) {
last_char_pos = accelerator_removed.size();
last_char_span = span;
}
for (int i = 0; i < span; i++)
accelerator_removed.push_back(s[array_pos + i]);
escaped = false;
} else {
escaped = true;
}
}
if (accelerated_char_pos)
*accelerated_char_pos = last_char_pos;
if (accelerated_char_span)
*accelerated_char_span = last_char_span;
return accelerator_removed;
}
size_t FindValidBoundaryBefore(const base::string16& text, size_t index) {
size_t length = text.length();
DCHECK_LE(index, length);
if (index == length)
return index;
// If |index| straddles a combining character sequence, go back until we find
// a base character.
while (index > 0 && CharIsMark(GetCodePointAt(text, index)))
--index;
// If |index| straddles a UTF-16 surrogate pair, go back.
U16_SET_CP_START(text.data(), 0, index);
return index;
}
size_t FindValidBoundaryAfter(const base::string16& text, size_t index) {
DCHECK_LE(index, text.length());
if (index == text.length())
return index;
int32_t text_index = base::checked_cast<int32_t>(index);
int32_t text_length = base::checked_cast<int32_t>(text.length());
// If |index| straddles a combining character sequence, go forward until we
// find a base character.
while (text_index < text_length &&
CharIsMark(GetCodePointAt(text, text_index))) {
++text_index;
}
// If |index| straddles a UTF-16 surrogate pair, go forward.
U16_SET_CP_LIMIT(text.data(), 0, text_index, text_length);
return static_cast<size_t>(text_index);
}
} // namespace gfx
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