private static void AssertNextToken(nsCSSScanner lex, nsCSSTokenType type, Func<nsCSSToken, bool> condition)
{
var token = new nsCSSToken();
Assert.IsTrue(lex.Next(token, true), "Unexpected EOF");
Assert.AreEqual(type, token.mType);
Assert.IsTrue(condition(token), "Condition for token {0} failed".Fmt(token.mType));
}
internal ErrorReporter(nsCSSScanner aScanner, CssStyleSheet aSheet, CssLoader aLoader, Uri aUri)
{
mScanner = aScanner;
mSheet = aSheet;
mLoader = aLoader;
mUri = aUri;
}
public IEnumerable<string> GetUris(string aInput)
{
var lexer = new nsCSSScanner(aInput, 1);
var token = new nsCSSToken();
while (lexer.Next(token, true))
if (token.mType == nsCSSTokenType.URL)
yield return token.mIdentStr;
}
public void ParseSimple()
{
var lex = new nsCSSScanner("h1 { color: #123; }", 0);
AssertNextToken(lex, nsCSSTokenType.Ident, t => t.mIdent.ToString() == "h1");
AssertNextToken(lex, nsCSSTokenType.Symbol, t => t.mSymbol == '{');
AssertNextToken(lex, nsCSSTokenType.Ident, t => t.mIdent.ToString() == "color");
AssertNextToken(lex, nsCSSTokenType.Symbol, t => t.mSymbol == ':');
AssertNextToken(lex, nsCSSTokenType.Hash, t => t.mIdent.ToString() == "123");
AssertNextToken(lex, nsCSSTokenType.Symbol, t => t.mSymbol == ';');
AssertNextToken(lex, nsCSSTokenType.Symbol, t => t.mSymbol == '}');
AssertNextTokenEnd(lex);
}
public void Create()
{
// ReSharper disable once UnusedVariable
var lex = new nsCSSScanner("", 0);
}
internal nsresult ParseStyleAttribute(string aAttributeValue,
Uri aDocURI,
Uri aBaseURI,
nsIPrincipal aNodePrincipal,
ref StyleRule aResult)
{
if (aNodePrincipal == null) throw new ArgumentException("Must have principal here!");
if (aBaseURI == null) throw new ArgumentException("need base URI");
// XXX line number?
var scanner = new nsCSSScanner(aAttributeValue, 0);
var reporter = new ErrorReporter(scanner, mSheet, mChildLoader, aDocURI);
InitScanner(scanner, reporter, aDocURI, aBaseURI, aNodePrincipal);
mSection = nsCSSSection.General;
// In quirks mode, allow style declarations to have braces or not
// (bug 99554).
bool haveBraces;
if (mNavQuirkMode && GetToken(true)) {
haveBraces = nsCSSTokenType.Symbol == mToken.mType &&
'{' == mToken.mSymbol;
UngetToken();
}
else {
haveBraces = false;
}
nsParseDeclaration parseFlags = nsParseDeclaration.AllowImportant;
if (haveBraces) {
parseFlags |= nsParseDeclaration.InBraces;
}
Declaration declaration = ParseDeclarationBlock(parseFlags);
if (declaration != null) {
// Create a style rule for the declaration
aResult = new StyleRule(null, declaration);
} else {
aResult = null;
}
ReleaseScanner();
// XXX check for low level errors
return nsresult.OK;
}
internal nsresult ParseSheet(string aInput,
Uri aSheetURI,
Uri aBaseURI,
nsIPrincipal aSheetPrincipal,
uint32_t aLineNumber,
bool aAllowUnsafeRules)
{
if (aSheetPrincipal == null) throw new ArgumentException("Must have principal here!");
if (aBaseURI == null) throw new ArgumentException("need base URI");
if (aSheetURI == null) throw new ArgumentException("need sheet URI");
if (mSheet == null) throw new ArgumentException("Must have sheet to parse into");
if (mSheet == null) return nsresult.ERROR_UNEXPECTED;
#if DEBUG
Uri uri = mSheet.GetSheetURI();
bool equal;
Debug.Assert(aSheetURI.Equals(uri, out equal).Succeeded() && equal,
"Sheet URI does not match passed URI");
Debug.Assert(mSheet.Principal().Equals(aSheetPrincipal,
out equal).Succeeded() &&
equal,
"Sheet principal does not match passed principal");
#endif
var scanner = new nsCSSScanner(aInput, aLineNumber);
var reporter = new ErrorReporter(scanner, mSheet, mChildLoader, aSheetURI);
InitScanner(scanner, reporter, aSheetURI, aBaseURI, aSheetPrincipal);
int32_t ruleCount = mSheet.StyleRuleCount();
if (0 < ruleCount) {
Rule lastRule = null;
mSheet.GetStyleRuleAt(ruleCount - 1, ref lastRule);
if (lastRule != null) {
switch (lastRule.GetKind()) {
case CssRuleKind.Charset:
case CssRuleKind.Import:
mSection = nsCSSSection.Import;
break;
case CssRuleKind.Namespace:
mSection = nsCSSSection.NameSpace;
break;
default:
mSection = nsCSSSection.General;
break;
}
lastRule = null;
}
}
else {
mSection = nsCSSSection.Charset; // sheet is empty, any rules are fair
}
mUnsafeRulesEnabled = aAllowUnsafeRules;
nsCSSToken tk = mToken;
for (;;) {
// Get next non-whitespace token
if (!GetToken(true)) {
mReporter.OutputError();
break;
}
if (nsCSSTokenType.HTMLComment == tk.mType) {
continue; // legal here only
}
if (nsCSSTokenType.AtKeyword == tk.mType) {
ParseAtRule((rule, _) => AppendRule(rule), this, false);
continue;
}
UngetToken();
if (ParseRuleSet((rule, _) => AppendRule(rule), this)) {
mSection = nsCSSSection.General;
}
}
ReleaseScanner();
mUnsafeRulesEnabled = false;
// XXX check for low level errors
return nsresult.OK;
}
internal nsresult ParseSelectorString(string aSelectorString,
Uri aURI, // for error reporting
uint32_t aLineNumber, // for error reporting
ref nsCSSSelectorList aSelectorList)
{
var scanner = new nsCSSScanner(aSelectorString, aLineNumber);
var reporter = new ErrorReporter(scanner, mSheet, mChildLoader, aURI);
InitScanner(scanner, reporter, aURI, aURI, null);
bool success = ParseSelectorList(ref aSelectorList, '\0');
// We deliberately do not call OUTPUT_ERROR here, because all our
// callers map a failure return to a JS exception, and if that JS
// exception is caught, people don't want to see parser diagnostics;
// see e.g. http://bugs.jquery.com/ticket/7535
// It would be nice to be able to save the parser diagnostics into
// the exception, so that if it _isn't_ caught we can report them
// along with the usual uncaught-exception message, but we don't
// have any way to do that at present; see bug 631621.
mReporter.ClearError();
ReleaseScanner();
if (success) {
Debug.Assert(aSelectorList != null, "Should have list!");
return nsresult.OK;
}
Debug.Assert(aSelectorList == null, "Shouldn't have list!");
return nsresult.ERROR_DOM_SYNTAX_ERR;
}
internal nsresult ParseDeclarations(string aBuffer,
Uri aSheetURI,
Uri aBaseURI,
nsIPrincipal aSheetPrincipal,
Declaration aDeclaration,
ref bool aChanged)
{
aChanged = false;
if (aSheetPrincipal == null) throw new ArgumentException("Must have principal here!");
var scanner = new nsCSSScanner(aBuffer, 0);
var reporter = new ErrorReporter(scanner, mSheet, mChildLoader, aSheetURI);
InitScanner(scanner, reporter, aSheetURI, aBaseURI, aSheetPrincipal);
mSection = nsCSSSection.General;
mData.AssertInitialState();
aDeclaration.ClearData();
// We could check if it was already empty, but...
aChanged = true;
for (;;) {
// If we cleared the old decl, then we want to be calling
// ValueAppended as we parse.
if (!ParseDeclaration(aDeclaration, nsParseDeclaration.AllowImportant,
true, ref aChanged)) {
if (!SkipDeclaration(false)) {
break;
}
}
}
aDeclaration.CompressFrom(mData);
ReleaseScanner();
return nsresult.OK;
}
internal nsresult ParseProperty(nsCSSProperty aPropID,
string aPropValue,
Uri aSheetURI,
Uri aBaseURI,
nsIPrincipal aSheetPrincipal,
Declaration aDeclaration,
ref bool aChanged,
bool aIsImportant,
bool aIsSVGMode)
{
if (aSheetPrincipal == null) throw new ArgumentException("Must have principal here!");
if (aBaseURI == null) throw new ArgumentException("need base URI");
if (aDeclaration == null) throw new ArgumentException("Need declaration to parse into!");
mData.AssertInitialState();
mTempData.AssertInitialState();
aDeclaration.AssertMutable();
var scanner = new nsCSSScanner(aPropValue, 0);
var reporter = new ErrorReporter(scanner, mSheet, mChildLoader, aSheetURI);
InitScanner(scanner, reporter, aSheetURI, aBaseURI, aSheetPrincipal);
mSection = nsCSSSection.General;
scanner.SetSVGMode(aIsSVGMode);
aChanged = false;
// Check for unknown or preffed off properties
if (nsCSSProperty.Unknown == aPropID || !nsCSSProps.IsEnabled(aPropID)) {
string propName = nsCSSProps.GetStringValue(aPropID);
{ if (!mSuppressErrors) mReporter.ReportUnexpected("PEUnknownProperty", propName); };
{ if (!mSuppressErrors) mReporter.ReportUnexpected("PEDeclDropped"); };
mReporter.OutputError();
ReleaseScanner();
return nsresult.OK;
}
bool parsedOK = ParseProperty(aPropID);
// We should now be at EOF
if (parsedOK && GetToken(true)) {
{ if (!mSuppressErrors) mReporter.ReportUnexpected("PEExpectEndValue", mToken); };
parsedOK = false;
}
if (!parsedOK) {
string propName = nsCSSProps.GetStringValue(aPropID);
{ if (!mSuppressErrors) mReporter.ReportUnexpected("PEValueParsingError", propName); };
{ if (!mSuppressErrors) mReporter.ReportUnexpected("PEDeclDropped"); };
mReporter.OutputError();
mTempData.ClearProperty(aPropID);
} else {
// We know we don't need to force a ValueAppended call for the new
// value. So if we are not processing a shorthand, and there's
// already a value for this property in the declaration at the
// same importance level, then we can just copy our parsed value
// directly into the declaration without going through the whole
// expand/compress thing.
if (!aDeclaration.TryReplaceValue(aPropID, aIsImportant, mTempData, ref aChanged)) {
// Do it the slow way
aDeclaration.ExpandTo(mData);
aChanged = mData.TransferFromBlock(mTempData, aPropID, aIsImportant,
true, false, aDeclaration);
aDeclaration.CompressFrom(mData);
}
mReporter.ClearError();
}
mTempData.AssertInitialState();
ReleaseScanner();
return nsresult.OK;
}
internal nsresult ParseMediaList(string aBuffer,
Uri aURI, // for error reporting
uint32_t aLineNumber, // for error reporting
nsMediaList aMediaList,
bool aHTMLMode)
{
// XXX Are there cases where the caller wants to keep what it already
// has in case of parser error? If GatherMedia ever changes to return
// a value other than true, we probably should avoid modifying aMediaList.
aMediaList.Clear();
// fake base URI since media lists don't have URIs in them
var scanner = new nsCSSScanner(aBuffer, aLineNumber);
var reporter = new ErrorReporter(scanner, mSheet, mChildLoader, aURI);
InitScanner(scanner, reporter, aURI, aURI, null);
mHTMLMediaMode = aHTMLMode;
// XXXldb We need to make the scanner not skip CSS comments! (Or
// should we?)
// For aHTMLMode, we used to follow the parsing rules in
// http://www.w3.org/TR/1999/REC-html401-19991224/types.html#type-media-descriptors
// which wouldn't work for media queries since they remove all but the
// first word. However, they're changed in
// http://www.whatwg.org/specs/web-apps/current-work/multipage/section-document.html#media2
// (as of 2008-05-29) which says that the media attribute just points
// to a media query. (The main substative difference is the relative
// precedence of commas and paretheses.)
bool parsedOK = GatherMedia(aMediaList, false);
Debug.Assert(parsedOK, "GatherMedia returned false; we probably want to avoid trashing aMediaList");
mReporter.ClearError();
ReleaseScanner();
mHTMLMediaMode = false;
return nsresult.OK;
}
internal bool ParseKeyframeSelectorString(string aSelectorString,
Uri aURI, // for error reporting
uint32_t aLineNumber, // for error reporting
List<float> aSelectorList)
{
Debug.Assert(aSelectorList.IsEmpty(), "given list should start empty");
var scanner = new nsCSSScanner(aSelectorString, aLineNumber);
var reporter = new ErrorReporter(scanner, mSheet, mChildLoader, aURI);
InitScanner(scanner, reporter, aURI, aURI, null);
bool success = ParseKeyframeSelectorList(aSelectorList) &&
// must consume entire input string
!GetToken(true);
mReporter.OutputError();
ReleaseScanner();
if (success) {
Debug.Assert(!aSelectorList.IsEmpty(), "should not be empty");
} else {
aSelectorList.Clear();
}
return success;
}
internal nsCSSKeyframeRule ParseKeyframeRule(string aBuffer,
Uri aURI,
uint32_t aLineNumber)
{
var scanner = new nsCSSScanner(aBuffer, aLineNumber);
var reporter = new ErrorReporter(scanner, mSheet, mChildLoader, aURI);
InitScanner(scanner, reporter, aURI, aURI, null);
nsCSSKeyframeRule result = ParseKeyframeRule();
if (GetToken(true)) {
// extra garbage at the end
result = null;
}
mReporter.OutputError();
ReleaseScanner();
return result;
}
internal bool EvaluateSupportsDeclaration(string aProperty,
string aValue,
Uri aDocURL,
Uri aBaseURL,
nsIPrincipal aDocPrincipal)
{
nsCSSProperty propID = nsCSSProps.LookupProperty(aProperty,
nsCSSProps.EnabledState.Enabled);
if (propID == nsCSSProperty.Unknown) {
return false;
}
var scanner = new nsCSSScanner(aValue, 0);
var reporter = new ErrorReporter(scanner, mSheet, mChildLoader, aDocURL);
InitScanner(scanner, reporter, aDocURL, aBaseURL, aDocPrincipal);
using (/*var suppressErrors = */new nsAutoSuppressErrors(this)) {
bool parsedOK = ParseProperty(propID) && !GetToken(true);
mReporter.ClearError();
ReleaseScanner();
mTempData.ClearProperty(propID);
mTempData.AssertInitialState();
return parsedOK;
}
}
internal bool EvaluateSupportsCondition(string aDeclaration,
Uri aDocURL,
Uri aBaseURL,
nsIPrincipal aDocPrincipal)
{
var scanner = new nsCSSScanner(aDeclaration, 0);
var reporter = new ErrorReporter(scanner, mSheet, mChildLoader, aDocURL);
InitScanner(scanner, reporter, aDocURL, aBaseURL, aDocPrincipal);
using (/*var suppressErrors = */new nsAutoSuppressErrors(this)) {
bool conditionMet = false;
bool parsedOK = ParseSupportsCondition(ref conditionMet) && !GetToken(true);
mReporter.ClearError();
ReleaseScanner();
return parsedOK && conditionMet;
}
}
private static void AssertNextTokenEnd(nsCSSScanner lex)
{
var token = new nsCSSToken();
Assert.IsFalse(lex.Next(token, true), "Expected EOF");
}
internal void InitScanner(nsCSSScanner aScanner,
ErrorReporter aReporter,
Uri aSheetURI, Uri aBaseURI,
nsIPrincipal aSheetPrincipal)
{
if (!(!mHTMLMediaMode)) throw new ArgumentException("Bad initial state");
if (!(!mParsingCompoundProperty)) throw new ArgumentException("Bad initial state");
if (!(mScanner == null)) throw new ArgumentException("already have scanner");
mScanner = aScanner;
mReporter = aReporter;
mScanner.SetErrorReporter(mReporter);
mBaseURI = aBaseURI;
mSheetURI = aSheetURI;
mSheetPrincipal = aSheetPrincipal;
mHavePushBack = false;
}
internal nsresult ParseRule(string aRule,
Uri aSheetURI,
Uri aBaseURI,
nsIPrincipal aSheetPrincipal,
ref Rule aResult)
{
if (aSheetPrincipal == null) throw new ArgumentException("Must have principal here!");
if (aBaseURI == null) throw new ArgumentException("need base URI");
aResult = null;
var scanner = new nsCSSScanner(aRule, 0);
var reporter = new ErrorReporter(scanner, mSheet, mChildLoader, aSheetURI);
InitScanner(scanner, reporter, aSheetURI, aBaseURI, aSheetPrincipal);
mSection = nsCSSSection.Charset; // callers are responsible for rejecting invalid rules.
nsCSSToken tk = mToken;
// Get first non-whitespace token
nsresult rv = nsresult.OK;
if (!GetToken(true)) {
{ if (!mSuppressErrors) mReporter.ReportUnexpected("PEParseRuleWSOnly"); };
mReporter.OutputError();
rv = nsresult.ERROR_DOM_SYNTAX_ERR;
} else {
if (nsCSSTokenType.AtKeyword == tk.mType) {
// FIXME: perhaps aInsideBlock should be true when we are?
Rule result = null; ParseAtRule((rule, _) => result = rule, aResult, false); aResult = result;
} else {
UngetToken();
Rule result = null; ParseRuleSet((rule, _) => result = rule, aResult); aResult = result;
}
if (aResult != null && GetToken(true)) {
// garbage after rule
{ if (!mSuppressErrors) mReporter.ReportUnexpected("PERuleTrailing", mToken); };
aResult = null;
}
if (aResult == null) {
rv = nsresult.ERROR_DOM_SYNTAX_ERR;
mReporter.OutputError();
}
}
ReleaseScanner();
return rv;
}
internal bool ParseColorString(string aBuffer,
Uri aURI, // for error reporting
uint32_t aLineNumber, // for error reporting
ref nsCSSValue aValue)
{
var scanner = new nsCSSScanner(aBuffer, aLineNumber);
var reporter = new ErrorReporter(scanner, mSheet, mChildLoader, aURI);
InitScanner(scanner, reporter, aURI, aURI, null);
// Parse a color, and check that there's nothing else after it.
bool colorParsed = ParseColor(ref aValue) && !GetToken(true);
mReporter.OutputError();
ReleaseScanner();
return colorParsed;
}
