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// Copyright 2016 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 "third_party/blink/renderer/core/layout/ng/inline/ng_bidi_paragraph.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
#include "third_party/blink/renderer/platform/text/icu_error.h"
namespace blink {
NGBidiParagraph::~NGBidiParagraph() {
ubidi_close(ubidi_);
}
bool NGBidiParagraph::SetParagraph(const String& text,
const ComputedStyle& block_style) {
if (UNLIKELY(block_style.GetUnicodeBidi() == UnicodeBidi::kPlaintext))
return SetParagraph(text, base::nullopt);
return SetParagraph(text, block_style.Direction());
}
bool NGBidiParagraph::SetParagraph(
const String& text,
base::Optional<TextDirection> base_direction) {
DCHECK(!ubidi_);
ubidi_ = ubidi_open();
UBiDiLevel para_level;
if (base_direction) {
base_direction_ = *base_direction;
para_level = IsLtr(base_direction_) ? UBIDI_LTR : UBIDI_RTL;
} else {
para_level = UBIDI_DEFAULT_LTR;
}
ICUError error;
ubidi_setPara(ubidi_, text.Characters16(), text.length(), para_level, nullptr,
&error);
if (U_FAILURE(error)) {
NOTREACHED();
ubidi_close(ubidi_);
ubidi_ = nullptr;
return false;
}
if (!base_direction)
base_direction_ = DirectionFromLevel(ubidi_getParaLevel(ubidi_));
return true;
}
TextDirection NGBidiParagraph::BaseDirectionForString(const StringView& text) {
DCHECK(!text.Is8Bit());
if (text.Is8Bit())
return TextDirection::kLtr;
UBiDiDirection direction =
ubidi_getBaseDirection(text.Characters16(), text.length());
return direction == UBIDI_RTL ? TextDirection::kRtl : TextDirection::kLtr;
}
unsigned NGBidiParagraph::GetLogicalRun(unsigned start,
UBiDiLevel* level) const {
int32_t end;
ubidi_getLogicalRun(ubidi_, start, &end, level);
return end;
}
void NGBidiParagraph::GetLogicalRuns(const String& text, Runs* runs) const {
DCHECK(runs->IsEmpty());
for (unsigned start = 0; start < text.length();) {
UBiDiLevel level;
unsigned end = GetLogicalRun(start, &level);
DCHECK_GT(end, start);
runs->emplace_back(start, end, level);
start = end;
}
}
void NGBidiParagraph::IndicesInVisualOrder(
const Vector<UBiDiLevel, 32>& levels,
Vector<int32_t, 32>* indices_in_visual_order_out) {
// Check the size before passing the raw pointers to ICU.
CHECK_EQ(levels.size(), indices_in_visual_order_out->size());
ubidi_reorderVisual(levels.data(), levels.size(),
indices_in_visual_order_out->data());
}
} // namespace blink
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