/* (non-Javadoc)
* @see com.itextpdf.styledxmlparser.css.CssNestedAtRule#addStatementToBody(com.itextpdf.styledxmlparser.css.CssStatement)
*/
public override void AddStatementToBody(CssStatement statement)
{
if (statement is CssMarginRule)
{
((CssMarginRule)statement).SetPageSelectors(pageSelectors);
}
this.body.Add(statement);
}
/// <summary>
/// Collects fonts from a
/// <see cref="iText.StyledXmlParser.Css.CssStatement"/>.
/// </summary>
/// <param name="cssStatement">the CSS statement</param>
private void CollectFonts(CssStatement cssStatement)
{
if (cssStatement is CssFontFaceRule)
{
fonts.Add((CssFontFaceRule)cssStatement);
}
else
{
if (cssStatement is CssMediaRule && ((CssMediaRule)cssStatement).MatchMediaDevice(deviceDescription))
{
foreach (CssStatement cssSubStatement in ((CssMediaRule)cssStatement).GetStatements())
{
CollectFonts(cssSubStatement);
}
}
}
}
/// <summary>
/// (BNF) at-rule : ATKEYWORD S* any* [ block | ';' S* ];
/// </summary>
/// <returns></returns>
/// <remarks>
/// NOTE: each at-rule might parse differently according to CSS3
/// The @media block for example contains a block of statements
/// while other at-rules with a block contain a block of declarations
/// </remarks>
private CssAtRule ParseAtRule()
{
CssAtRule atRule = new CssAtRule();
int start = this.Position + 1; // start with first char of ident
char ch;
while (this.Read(out ch) && !Char.IsWhiteSpace(ch))
{
// continue consuming
}
atRule.Ident = this.Copy(start);
while (this.Read(out ch) && Char.IsWhiteSpace(ch))
{
// consuming whitespace
}
start = this.Position; // start with current char
do
{
switch (ch)
{
case '{': //Block Begin
{
atRule.Value = this.Copy(start);
bool containsRuleSets = String.Equals(atRule.Ident, CssAtRule.MediaIdent, StringComparison.Ordinal);
while (true)
{
while (this.Read(out ch) && Char.IsWhiteSpace(ch))
{
// consume whitespace
}
if (ch == '}')
{
break;
}
try
{
if (containsRuleSets)
{
// includes @media
CssStatement statement = this.ParseStatement();
atRule.Block.Values.Add(statement);
}
else
{
// includes @font-face, @page
this.PutBack();
CssDeclaration declaration = this.ParseDeclaration();
atRule.Block.Values.Add(declaration);
}
}
catch (ParseException ex)
{
this.errors.Add(ex);
while (this.Read(out ch) && ch != '}')
{
// restabilize on block end
}
break;
}
}
return(atRule);
}
case ';': //At-Rule End
{
atRule.Value = this.Copy(start);
return(atRule);
}
}
} while (this.Read(out ch));
throw new UnexpectedEndOfFile("Unclosed At-Rule", this.reader.FilePath, this.reader.Line, this.reader.Column);
}
/// <summary>
/// (BNF) stylesheet : [ CDO | CDC | S | statement ]*;
/// </summary>
/// <returns>CSS StyleSheet parse tree</returns>
private CssStyleSheet ParseStyleSheet()
{
CssStyleSheet styleSheet = new CssStyleSheet();
using (this.reader = new LineReader(this.filePath, this.source, CssParser.ReadFilters))
{
this.reader.NormalizeWhiteSpace = true;
#if DEBUG
System.Diagnostics.Stopwatch watch = System.Diagnostics.Stopwatch.StartNew();
#endif
char ch;
while (this.Read(out ch))
{
switch (ch)
{
case '\uFEFF': // BOM (UTF byte order mark)
case '\t': //TAB
case '\n': //LF
case '\r': //CR
case ' ': //Space
{
// skip whitespace
continue;
}
case '<':
{
// CDO (Char Data Open?)
if (!this.Read(out ch) || ch != '-' ||
!this.Read(out ch) || ch != '-')
{
throw new SyntaxError("Expected \"<!--\"", this.reader.FilePath, this.reader.Line, this.reader.Column);
}
continue;
}
case '-':
{
// CDC (Char Data Close?)
if (!this.Read(out ch) || ch != '-' ||
!this.Read(out ch) || ch != '>')
{
throw new SyntaxError("Expected \"-->\"", this.reader.FilePath, this.reader.Line, this.reader.Column);
}
continue;
}
default:
{
try
{
CssStatement statement = this.ParseStatement();
styleSheet.Statements.Add(statement);
}
catch (ParseException ex)
{
this.errors.Add(ex);
while (this.Read(out ch) && ch != '}')
{
// restabilize on next statement
}
}
continue;
}
}
}
#if DEBUG
watch.Stop();
Console.WriteLine("CSS parse duration: {0} ms for {1} chars", watch.ElapsedMilliseconds, this.reader.Length);
#endif
}
this.reader = null;
this.source = null;
return(styleSheet);
}
