DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (fddffdeab170)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/dom/CSSLexer.h"
#include "js/Value.h"
#include "mozilla/dom/CSSLexerBinding.h"
#include "mozilla/dom/ToJSValue.h"

namespace mozilla {
namespace dom {

// Ensure that constants are consistent.

#define CHECK(X, Y) \
  static_assert(static_cast<int>(X) == static_cast<int>(Y),       \
                "nsCSSToken and CSSTokenType should have identical values")

CHECK(eCSSToken_Whitespace, CSSTokenType::Whitespace);
CHECK(eCSSToken_Comment, CSSTokenType::Comment);
CHECK(eCSSToken_Ident, CSSTokenType::Ident);
CHECK(eCSSToken_Function, CSSTokenType::Function);
CHECK(eCSSToken_AtKeyword, CSSTokenType::At);
CHECK(eCSSToken_ID, CSSTokenType::Id);
CHECK(eCSSToken_Hash, CSSTokenType::Hash);
CHECK(eCSSToken_Number, CSSTokenType::Number);
CHECK(eCSSToken_Dimension, CSSTokenType::Dimension);
CHECK(eCSSToken_Percentage, CSSTokenType::Percentage);
CHECK(eCSSToken_String, CSSTokenType::String);
CHECK(eCSSToken_Bad_String, CSSTokenType::Bad_string);
CHECK(eCSSToken_URL, CSSTokenType::Url);
CHECK(eCSSToken_Bad_URL, CSSTokenType::Bad_url);
CHECK(eCSSToken_Symbol, CSSTokenType::Symbol);
CHECK(eCSSToken_Includes, CSSTokenType::Includes);
CHECK(eCSSToken_Dashmatch, CSSTokenType::Dashmatch);
CHECK(eCSSToken_Beginsmatch, CSSTokenType::Beginsmatch);
CHECK(eCSSToken_Endsmatch, CSSTokenType::Endsmatch);
CHECK(eCSSToken_Containsmatch, CSSTokenType::Containsmatch);
CHECK(eCSSToken_URange, CSSTokenType::Urange);
CHECK(eCSSToken_HTMLComment, CSSTokenType::Htmlcomment);

#undef CHECK

CSSLexer::CSSLexer(const nsAString& aText)
  : mInput(aText)
  , mScanner(mInput, 1)
{
}

CSSLexer::~CSSLexer()
{
}

bool
CSSLexer::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto,
                     JS::MutableHandle<JSObject*> aReflector)
{
  return CSSLexerBinding::Wrap(aCx, this, aGivenProto, aReflector);
}

uint32_t
CSSLexer::LineNumber()
{
  // The scanner uses 1-based line numbers, but our callers expect
  // 0-based.
  return mScanner.GetLineNumber() - 1;
}

uint32_t
CSSLexer::ColumnNumber()
{
  return mScanner.GetColumnNumber();
}

void
CSSLexer::PerformEOFFixup(const nsAString& aInputString, bool aPreserveBackslash,
                          nsAString& aResult)
{
  aResult.Append(aInputString);
  uint32_t eofChars = mScanner.GetEOFCharacters();

  if (aPreserveBackslash &&
      (eofChars & (nsCSSScanner::eEOFCharacters_DropBackslash |
                   nsCSSScanner::eEOFCharacters_ReplacementChar)) != 0) {
    eofChars &= ~(nsCSSScanner::eEOFCharacters_DropBackslash |
                  nsCSSScanner::eEOFCharacters_ReplacementChar);
    aResult.Append('\\');
  }

  if ((eofChars & nsCSSScanner::eEOFCharacters_DropBackslash) != 0 &&
      aResult.Length() > 0 && aResult.Last() == '\\') {
    aResult.Truncate(aResult.Length() - 1);
  }

  nsCSSScanner::AppendImpliedEOFCharacters(nsCSSScanner::EOFCharacters(eofChars),
                                           aResult);
}

void
CSSLexer::NextToken(Nullable<CSSToken>& aResult)
{
  nsCSSToken token;
  if (!mScanner.Next(token, eCSSScannerExclude_None)) {
    return;
  }

  CSSToken& resultToken(aResult.SetValue());

  resultToken.mTokenType = static_cast<CSSTokenType>(token.mType);
  resultToken.mStartOffset = mScanner.GetTokenOffset();
  resultToken.mEndOffset = mScanner.GetTokenEndOffset();

  switch (token.mType) {
    case eCSSToken_Whitespace:
      break;

    case eCSSToken_Ident:
    case eCSSToken_Function:
    case eCSSToken_AtKeyword:
    case eCSSToken_ID:
    case eCSSToken_Hash:
      resultToken.mText.Construct(token.mIdent);
      break;

    case eCSSToken_Dimension:
      resultToken.mText.Construct(token.mIdent);
      /* FALLTHROUGH */
    case eCSSToken_Number:
    case eCSSToken_Percentage:
      resultToken.mNumber.Construct(token.mNumber);
      resultToken.mHasSign.Construct(token.mHasSign);
      resultToken.mIsInteger.Construct(token.mIntegerValid);
      break;

    case eCSSToken_String:
    case eCSSToken_Bad_String:
    case eCSSToken_URL:
    case eCSSToken_Bad_URL:
      resultToken.mText.Construct(token.mIdent);
      /* Don't bother emitting the delimiter, as it is readily extracted
         from the source string when needed.  */
      break;

    case eCSSToken_Symbol:
      resultToken.mText.Construct(nsString(&token.mSymbol, 1));
      break;

    case eCSSToken_Includes:
    case eCSSToken_Dashmatch:
    case eCSSToken_Beginsmatch:
    case eCSSToken_Endsmatch:
    case eCSSToken_Containsmatch:
    case eCSSToken_URange:
      break;

    case eCSSToken_Comment:
    case eCSSToken_HTMLComment:
      /* The comment text is easily extracted from the source string,
         and is rarely useful.  */
      break;
  }
}

} // namespace dom
} // namespace mozilla