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// Copyright 2017 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/core/layout/break_token.h"
#include "third_party/blink/renderer/core/layout/inline/inline_break_token.h"
#include "third_party/blink/renderer/core/layout/block_break_token.h"
#include "third_party/blink/renderer/platform/wtf/size_assertions.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
namespace blink {
namespace {
struct SameSizeAsBreakToken : GarbageCollected<BreakToken> {
Member<void*> member;
unsigned flags;
};
ASSERT_SIZE(BreakToken, SameSizeAsBreakToken);
} // namespace
bool BreakToken::IsInParallelFlow() const {
if (const auto* block_break_token = DynamicTo<BlockBreakToken>(this)) {
return block_break_token->IsAtBlockEnd();
}
if (const auto* inline_break_token = DynamicTo<InlineBreakToken>(this)) {
return inline_break_token->IsInParallelBlockFlow();
}
return false;
}
#if DCHECK_IS_ON()
namespace {
void AppendBreakTokenToString(const BreakToken* token,
StringBuilder* string_builder,
unsigned indent = 2) {
if (!token)
return;
DCHECK(string_builder);
for (unsigned i = 0; i < indent; i++)
string_builder->Append(" ");
string_builder->Append(token->ToString());
string_builder->Append("\n");
if (auto* block_break_token = DynamicTo<BlockBreakToken>(token)) {
const auto children = block_break_token->ChildBreakTokens();
for (const auto& child : children)
AppendBreakTokenToString(child, string_builder, indent + 2);
} else if (auto* inline_break_token = DynamicTo<InlineBreakToken>(token)) {
if (auto* child_block_break_token =
inline_break_token->GetBlockBreakToken()) {
AppendBreakTokenToString(child_block_break_token, string_builder,
indent + 2);
}
}
}
} // namespace
String BreakToken::ToString() const {
switch (Type()) {
case kBlockBreakToken:
return To<BlockBreakToken>(this)->ToString();
case kInlineBreakToken:
return To<InlineBreakToken>(this)->ToString();
}
NOTREACHED();
}
void BreakToken::ShowBreakTokenTree() const {
StringBuilder string_builder;
string_builder.Append(".:: LayoutNG Break Token Tree ::.\n");
AppendBreakTokenToString(this, &string_builder);
fprintf(stderr, "%s\n", string_builder.ToString().Utf8().c_str());
}
#endif // DCHECK_IS_ON()
void BreakToken::Trace(Visitor* visitor) const {
switch (Type()) {
case kBlockBreakToken:
To<BlockBreakToken>(this)->TraceAfterDispatch(visitor);
return;
case kInlineBreakToken:
To<InlineBreakToken>(this)->TraceAfterDispatch(visitor);
return;
}
NOTREACHED();
}
void BreakToken::TraceAfterDispatch(Visitor* visitor) const {
visitor->Trace(box_);
}
} // namespace blink
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