/// <summary>
/// (BNF) declaration : property ':' S* value;
/// (BNF) property : IDENT S*;
/// </summary>
/// <returns></returns>
private CssDeclaration ParseDeclaration()
{
CssDeclaration declaration = new CssDeclaration();
char ch;
while (this.Read(out ch) && (Char.IsWhiteSpace(ch) || ch == ';'))
{
// skip whitespace, and empty declarations
}
// consume property name
switch (ch)
{
case '{':
case ':':
//case ';':
{
throw new SyntaxError("Declaration missing property name", this.reader.FilePath, this.reader.Line, this.reader.Column);
}
case '}':
{
// no more declarations
return(null);
}
}
// read property, starting with current char
int start = this.Position;
while (this.Read(out ch) && !Char.IsWhiteSpace(ch) && ch != ':')
{
// consume property name
switch (ch)
{
case '{':
//case ':':
case ';':
{
throw new SyntaxError("Invalid CSS property name: " + this.Copy(start), this.reader.FilePath, this.reader.Line, this.reader.Column);
}
case '}':
{
this.PutBack();
goto case ';';
}
}
}
declaration.Property = this.Copy(start);
if (Char.IsWhiteSpace(ch))
{
while (this.Read(out ch) && (Char.IsWhiteSpace(ch)))
{
// skip whitespace
}
}
if (ch != ':')
{
// missing the property delim and value
if (ch == ';' || ch == '}')
{
// these are good chars for resyncing
// so put them back on the stream to
// not create subsequent errors
this.PutBack();
}
throw new SyntaxError("Expected <property> : <value>", this.reader.FilePath, this.reader.Line, this.reader.Column);
}
CssValueList value = this.ParseValue();
declaration.Value = value;
return(declaration);
}
/// <summary>
/// Formats a <see cref="CssValueList"/> to a single string
/// </summary>
/// <param name="valueList"><see cref="CssValueList"/> to format</param>
/// <returns>Value list formatted as a string</returns>
private string FormatCss(CssValueList valueList)
{
bool space = false;
var values = new StringBuilder();
foreach (CssString value in valueList.Values)
{
if (space)
{
values.Append(" ");
}
else
{
space = true;
}
values.Append(value);
}
return values.ToString();
}
/// <summary>
/// (BNF) value : [ any | block | ATKEYWORD S* ]+;
/// (BNF) any : [ IDENT | NUMBER | PERCENTAGE | DIMENSION | STRING
/// | DELIM | URI | HASH | UNICODE-RANGE | INCLUDES
/// | FUNCTION S* any* ')' | DASHMATCH | '(' S* any* ')'
/// | '[' S* any* ']' ] S*;
/// </summary>
/// <returns></returns>
private CssValueList ParseValue()
{
CssValueList value = new CssValueList();
char ch;
while (this.Read(out ch) && Char.IsWhiteSpace(ch))
{
// skip whitespace, and empty declarations
}
switch (ch)
{
case '{':
case ':':
case ';':
case '}':
{
throw new SyntaxError("Invalid char in CSS property value: '" + ch + "'", this.reader.FilePath, this.reader.Line, this.reader.Column);
}
}
// read value, starting with current char
int start = this.Position;
while (this.Read(out ch))
{
// consume declaration value
switch (ch)
{
case '{':
//case ':':// leave in for "filter: progid:DXImageTransform.Microsoft..."
{
throw new SyntaxError("Invalid CSS property value: " + this.Copy(start), this.reader.FilePath, this.reader.Line, this.reader.Column);
}
case '}':
case ';':
{
//Should this parse the value further?
CssString any = new CssString();
any.Value = this.Copy(start);
value.Values.Add(any);
if (ch == '}')
{
this.PutBack();
}
return value;
}
}
}
throw new UnexpectedEndOfFile("Unclosed declaration", this.reader.FilePath, this.reader.Line, this.reader.Column);
}
