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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 <stdint.h>
- #include "base/i18n/char_iterator.h"
- #include "base/i18n/rtl.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"
- #include "ui/gfx/font_list.h"
- #include "ui/gfx/geometry/insets.h"
- #include "ui/gfx/geometry/rect.h"
- #include "ui/gfx/geometry/size.h"
- namespace gfx {
- using base::i18n::UTF16CharIterator;
- namespace {
- constexpr char16_t kAcceleratorChar = '&';
- constexpr char16_t kOpenParenthesisChar = '(';
- constexpr char16_t kCloseParenthesisChar = ')';
- // Returns true if the specified character must be elided from a string.
- // Examples are combining marks and whitespace.
- bool IsCombiningMark(UChar32 c) {
- const 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;
- }
- bool IsSpace(UChar32 c) {
- // Ignore NUL character.
- if (!c)
- return false;
- const int8_t char_type = u_charType(c);
- return char_type == U_SPACE_SEPARATOR || char_type == U_LINE_SEPARATOR ||
- char_type == U_PARAGRAPH_SEPARATOR || char_type == U_CONTROL_CHAR;
- }
- std::u16string RemoveAcceleratorChar(bool full_removal,
- const std::u16string& s,
- int* accelerated_char_pos,
- int* accelerated_char_span) {
- bool escaped = false;
- ptrdiff_t last_char_pos = -1;
- int last_char_span = 0;
- UTF16CharIterator chars(s);
- std::u16string accelerator_removed;
- // The states of a state machine looking for a CJK-style accelerator (i.e.
- // "(&x)"). |cjk_state| proceeds up from |kFoundNothing| through these states,
- // resetting either when it sees a complete accelerator, or gives up because
- // the current character doesn't match.
- enum {
- kFoundNothing,
- kFoundOpenParen,
- kFoundAcceleratorChar,
- kFoundAccelerator
- } cjk_state = kFoundNothing;
- size_t pre_cjk_size = 0;
- accelerator_removed.reserve(s.size());
- while (!chars.end()) {
- int32_t c = chars.get();
- int array_pos = chars.array_pos();
- chars.Advance();
- if (full_removal) {
- if (cjk_state == kFoundNothing && c == kOpenParenthesisChar) {
- pre_cjk_size = array_pos;
- cjk_state = kFoundOpenParen;
- } else if (cjk_state == kFoundOpenParen && c == kAcceleratorChar) {
- cjk_state = kFoundAcceleratorChar;
- } else if (cjk_state == kFoundAcceleratorChar) {
- // Accept any character as the accelerator.
- cjk_state = kFoundAccelerator;
- } else if (cjk_state == kFoundAccelerator && c == kCloseParenthesisChar) {
- cjk_state = kFoundNothing;
- accelerator_removed.resize(pre_cjk_size);
- pre_cjk_size = 0;
- escaped = false;
- continue;
- } else {
- cjk_state = kFoundNothing;
- }
- }
- if (c != kAcceleratorChar || escaped) {
- int span = chars.array_pos() - array_pos;
- if (escaped && c != kAcceleratorChar) {
- 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 && !full_removal)
- *accelerated_char_pos = last_char_pos;
- if (accelerated_char_span && !full_removal)
- *accelerated_char_span = last_char_span;
- return accelerator_removed;
- }
- } // namespace
- std::u16string LocateAndRemoveAcceleratorChar(const std::u16string& s,
- int* accelerated_char_pos,
- int* accelerated_char_span) {
- return RemoveAcceleratorChar(false, s, accelerated_char_pos,
- accelerated_char_span);
- }
- std::u16string RemoveAccelerator(const std::u16string& s) {
- return RemoveAcceleratorChar(true, s, nullptr, nullptr);
- }
- size_t FindValidBoundaryBefore(const std::u16string& text,
- size_t index,
- bool trim_whitespace) {
- UTF16CharIterator it = UTF16CharIterator::LowerBound(text, index);
- // First, move left until we're positioned on a code point that is not a
- // combining mark.
- while (!it.start() && IsCombiningMark(it.get()))
- it.Rewind();
- // Next, maybe trim whitespace to the left of the current position.
- if (trim_whitespace) {
- while (!it.start() && IsSpace(it.PreviousCodePoint()))
- it.Rewind();
- }
- return it.array_pos();
- }
- size_t FindValidBoundaryAfter(const std::u16string& text,
- size_t index,
- bool trim_whitespace) {
- UTF16CharIterator it = UTF16CharIterator::UpperBound(text, index);
- // First, move right until we're positioned on a code point that is not a
- // combining mark.
- while (!it.end() && IsCombiningMark(it.get()))
- it.Advance();
- // Next, maybe trim space at the current position.
- if (trim_whitespace) {
- // A mark combining with a space is renderable, so we'll prevent
- // trimming spaces with combining marks.
- while (!it.end() && IsSpace(it.get()) &&
- !IsCombiningMark(it.NextCodePoint())) {
- it.Advance();
- }
- }
- return it.array_pos();
- }
- HorizontalAlignment MaybeFlipForRTL(HorizontalAlignment alignment) {
- if (base::i18n::IsRTL() &&
- (alignment == gfx::ALIGN_LEFT || alignment == gfx::ALIGN_RIGHT)) {
- alignment =
- (alignment == gfx::ALIGN_LEFT) ? gfx::ALIGN_RIGHT : gfx::ALIGN_LEFT;
- }
- return alignment;
- }
- Size GetStringSize(const std::u16string& text, const FontList& font_list) {
- return Size(GetStringWidth(text, font_list), font_list.GetHeight());
- }
- Insets AdjustVisualBorderForFont(const FontList& font_list,
- const Insets& desired_visual_padding) {
- Insets result = desired_visual_padding;
- const int baseline = font_list.GetBaseline();
- const int leading_space = baseline - font_list.GetCapHeight();
- const int descender = font_list.GetHeight() - baseline;
- result.set_top(std::max(0, result.top() - leading_space));
- result.set_bottom(std::max(0, result.bottom() - descender));
- return result;
- }
- int GetFontCapHeightCenterOffset(const gfx::FontList& original_font,
- const gfx::FontList& to_center) {
- const int original_cap_height = original_font.GetCapHeight();
- const int original_cap_leading =
- original_font.GetBaseline() - original_cap_height;
- const int to_center_cap_height = to_center.GetCapHeight();
- const int to_center_leading = to_center.GetBaseline() - to_center_cap_height;
- const int cap_height_diff = original_cap_height - to_center_cap_height;
- const int new_cap_top =
- original_cap_leading + base::ClampRound(cap_height_diff / 2.0f);
- const int new_top = new_cap_top - to_center_leading;
- // Since we assume the old font starts at zero, the new top is the adjustment.
- return new_top;
- }
- } // namespace gfx
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