1 files changed, 166 insertions, 0 deletions
diff --git a/layout/style/CSSLexer.cpp b/layout/style/CSSLexer.cpp
new file mode 100644
index 000000000..f465981e7
--- /dev/null
+++ b/layout/style/CSSLexer.cpp
@@ -0,0 +1,166 @@
+/* -*- 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);
+      MOZ_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