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// Copyright 2020 The Chromium Authors
// 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/platform/text/writing_direction_mode.h"
#include <array>
#include <ostream>
#include "third_party/blink/renderer/platform/geometry/logical_direction.h"
namespace blink {
namespace {
using PhysicalDirectionMap =
std::array<PhysicalDirection,
static_cast<size_t>(WritingMode::kMaxWritingMode) + 1>;
// Following ten arrays contain values for horizontal-tb, vertical-rl,
// vertical-lr, sideways-rl, and sideways-lr in this order.
constexpr PhysicalDirectionMap kInlineStartMap = {
PhysicalDirection::kLeft, PhysicalDirection::kUp, PhysicalDirection::kUp,
PhysicalDirection::kUp, PhysicalDirection::kDown};
constexpr PhysicalDirectionMap kInlineEndMap = {
PhysicalDirection::kRight, PhysicalDirection::kDown,
PhysicalDirection::kDown, PhysicalDirection::kDown, PhysicalDirection::kUp};
constexpr PhysicalDirectionMap kBlockStartMap = {
PhysicalDirection::kUp, PhysicalDirection::kRight, PhysicalDirection::kLeft,
PhysicalDirection::kRight, PhysicalDirection::kLeft};
constexpr PhysicalDirectionMap kBlockEndMap = {
PhysicalDirection::kDown, PhysicalDirection::kLeft,
PhysicalDirection::kRight, PhysicalDirection::kLeft,
PhysicalDirection::kRight};
constexpr PhysicalDirectionMap kLineOverMap = {
PhysicalDirection::kUp, PhysicalDirection::kRight,
PhysicalDirection::kRight, PhysicalDirection::kRight,
PhysicalDirection::kLeft};
constexpr PhysicalDirectionMap kLineUnderMap = {
PhysicalDirection::kDown, PhysicalDirection::kLeft,
PhysicalDirection::kLeft, PhysicalDirection::kLeft,
PhysicalDirection::kRight};
using LogicalDirectionMap =
std::array<LogicalDirection,
static_cast<size_t>(WritingMode::kMaxWritingMode) + 1>;
// Following ten arrays contain values for horizontal-tb, vertical-rl,
// vertical-lr, sideways-rl, and sideways-lr in this order.
constexpr LogicalDirectionMap kTopMap = {
LogicalDirection::kBlockStart, LogicalDirection::kInlineStart,
LogicalDirection::kInlineStart, LogicalDirection::kInlineStart,
LogicalDirection::kInlineEnd,
};
constexpr LogicalDirectionMap kRightMap = {
LogicalDirection::kInlineEnd, LogicalDirection::kBlockStart,
LogicalDirection::kBlockEnd, LogicalDirection::kBlockStart,
LogicalDirection::kBlockEnd,
};
constexpr LogicalDirectionMap kBottomMap = {
LogicalDirection::kBlockEnd, LogicalDirection::kInlineEnd,
LogicalDirection::kInlineEnd, LogicalDirection::kInlineEnd,
LogicalDirection::kInlineStart,
};
constexpr LogicalDirectionMap kLeftMap = {
LogicalDirection::kInlineStart, LogicalDirection::kBlockEnd,
LogicalDirection::kBlockStart, LogicalDirection::kBlockEnd,
LogicalDirection::kBlockStart,
};
} // namespace
PhysicalDirection WritingDirectionMode::InlineStart() const {
if (direction_ == TextDirection::kLtr) {
return kInlineStartMap[static_cast<int>(writing_mode_)];
}
return kInlineEndMap[static_cast<int>(writing_mode_)];
}
PhysicalDirection WritingDirectionMode::InlineEnd() const {
if (direction_ == TextDirection::kLtr) {
return kInlineEndMap[static_cast<int>(writing_mode_)];
}
return kInlineStartMap[static_cast<int>(writing_mode_)];
}
PhysicalDirection WritingDirectionMode::BlockStart() const {
return kBlockStartMap[static_cast<int>(writing_mode_)];
}
PhysicalDirection WritingDirectionMode::BlockEnd() const {
return kBlockEndMap[static_cast<int>(writing_mode_)];
}
PhysicalDirection WritingDirectionMode::LineOver() const {
return kLineOverMap[static_cast<int>(writing_mode_)];
}
PhysicalDirection WritingDirectionMode::LineUnder() const {
return kLineUnderMap[static_cast<int>(writing_mode_)];
}
LogicalDirection WritingDirectionMode::Top() const {
if (IsLtr() || IsHorizontalWritingMode(writing_mode_)) {
return kTopMap[static_cast<int>(writing_mode_)];
}
return kBottomMap[static_cast<int>(writing_mode_)];
}
LogicalDirection WritingDirectionMode::Right() const {
if (IsLtr() || !IsHorizontalWritingMode(writing_mode_)) {
return kRightMap[static_cast<int>(writing_mode_)];
}
return kLeftMap[static_cast<int>(writing_mode_)];
}
LogicalDirection WritingDirectionMode::Bottom() const {
if (IsLtr() || IsHorizontalWritingMode(writing_mode_)) {
return kBottomMap[static_cast<int>(writing_mode_)];
}
return kTopMap[static_cast<int>(writing_mode_)];
}
LogicalDirection WritingDirectionMode::Left() const {
if (IsLtr() || !IsHorizontalWritingMode(writing_mode_)) {
return kLeftMap[static_cast<int>(writing_mode_)];
}
return kRightMap[static_cast<int>(writing_mode_)];
}
std::ostream& operator<<(std::ostream& ostream,
const WritingDirectionMode& writing_direction) {
return ostream << writing_direction.GetWritingMode() << " "
<< writing_direction.Direction();
}
} // namespace blink
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