| // Copyright 2014 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/css/parser/css_parser_token_range.h" |
| |
| #include "third_party/blink/renderer/platform/wtf/static_constructors.h" |
| #include "third_party/blink/renderer/platform/wtf/text/string_builder.h" |
| |
| namespace blink { |
| |
| DEFINE_GLOBAL(CSSParserToken, g_static_eof_token); |
| |
| void CSSParserTokenRange::InitStaticEOFToken() { |
| new ((void*)&g_static_eof_token) CSSParserToken(kEOFToken); |
| } |
| |
| CSSParserTokenRange CSSParserTokenRange::MakeSubRange( |
| const CSSParserToken* first, |
| const CSSParserToken* last) const { |
| if (first == &g_static_eof_token) |
| first = last_; |
| if (last == &g_static_eof_token) |
| last = last_; |
| DCHECK_LE(first, last); |
| return CSSParserTokenRange(first, last); |
| } |
| |
| CSSParserTokenRange CSSParserTokenRange::ConsumeBlock() { |
| DCHECK_EQ(Peek().GetBlockType(), CSSParserToken::kBlockStart); |
| const CSSParserToken* start = &Peek() + 1; |
| unsigned nesting_level = 0; |
| do { |
| const CSSParserToken& token = Consume(); |
| if (token.GetBlockType() == CSSParserToken::kBlockStart) |
| nesting_level++; |
| else if (token.GetBlockType() == CSSParserToken::kBlockEnd) |
| nesting_level--; |
| } while (nesting_level && first_ < last_); |
| |
| if (nesting_level) |
| return MakeSubRange(start, first_); // Ended at EOF |
| return MakeSubRange(start, first_ - 1); |
| } |
| |
| void CSSParserTokenRange::ConsumeComponentValue() { |
| // FIXME: This is going to do multiple passes over large sections of a |
| // stylesheet. We should consider optimising this by precomputing where each |
| // block ends. |
| unsigned nesting_level = 0; |
| do { |
| const CSSParserToken& token = Consume(); |
| if (token.GetBlockType() == CSSParserToken::kBlockStart) |
| nesting_level++; |
| else if (token.GetBlockType() == CSSParserToken::kBlockEnd) |
| nesting_level--; |
| } while (nesting_level && first_ < last_); |
| } |
| |
| String CSSParserTokenRange::Serialize() const { |
| // We're supposed to insert comments between certain pairs of token types |
| // as per spec, but since this is currently only used for @supports CSSOM |
| // we just get these cases wrong and avoid the additional complexity. |
| StringBuilder builder; |
| for (const CSSParserToken* it = first_; it != last_; ++it) |
| it->Serialize(builder); |
| return builder.ToString(); |
| } |
| |
| } // namespace blink |