|
static private Parse ( string &css, object parent, bool readOnly, string replacedStrings, CssStyleSheetType origin ) : |
||
| css | string | |
| parent | object | |
| readOnly | bool | |
| replacedStrings | string | |
| origin | CssStyleSheetType | |
| return | ||
private CssRule TryParse(ref string css, object parent, bool readOnly,
IList <string> replacedStrings, CssStyleSheetType origin)
{
CssRule rule;
// creates and parses a CssMediaRule or return null
rule = CssMediaRule.Parse(ref css, parent, readOnly, replacedStrings, origin);
if (rule != null)
{
return(rule);
}
// create ImportRule
rule = CssImportRule.Parse(ref css, parent, readOnly, replacedStrings, origin);
if (rule != null)
{
return(rule);
}
// create CharSetRule
rule = CssCharsetRule.Parse(ref css, parent, readOnly, replacedStrings, origin);
if (rule != null)
{
return(rule);
}
rule = CssFontFaceRule.Parse(ref css, parent, readOnly, replacedStrings, origin);
if (rule != null)
{
_hasFontRule = true;
return(rule);
}
rule = CssPageRule.Parse(ref css, parent, readOnly, replacedStrings, origin);
if (rule != null)
{
return(rule);
}
rule = CssUnknownRule.Parse(ref css, parent, readOnly, replacedStrings, origin);
if (rule != null)
{
return(rule);
}
return(rule);
}
/* can take two kind of structures:
* rule{}
* rule{}
* or:
* {
* rule{}
* rule{}
* }
* */
private void Parse(ref string css, object parent, bool readOnly, IList <string> replacedStrings, CssStyleSheetType origin)
{
bool withBrackets = false;
css = css.Trim();
if (css.StartsWith("{", StringComparison.OrdinalIgnoreCase))
{
withBrackets = true;
css = css.Substring(1);
}
while (true)
{
css = css.Trim();
if (css.Length == 0)
{
if (withBrackets)
{
throw new DomException(DomExceptionType.SyntaxErr, "Style block missing ending bracket");
}
break;
}
else if (css.StartsWith("}", StringComparison.OrdinalIgnoreCase))
{
// end of block;
css = css.Substring(1);
break;
}
else if (css.StartsWith("@", StringComparison.OrdinalIgnoreCase))
{
// Parse at-rules
// @-rule
CssRule rule;
// creates and parses a CssMediaRule or return null
rule = CssMediaRule.Parse(ref css, parent, readOnly, replacedStrings, origin);
if (rule == null)
{
// create ImportRule
rule = CssImportRule.Parse(ref css, parent, readOnly, replacedStrings, origin);
if (rule == null)
{
// create CharSetRule
rule = CssCharsetRule.Parse(ref css, parent, readOnly, replacedStrings, origin);
if (rule == null)
{
rule = CssFontFaceRule.Parse(ref css, parent, readOnly, replacedStrings, origin);
if (rule == null)
{
rule = CssPageRule.Parse(ref css, parent, readOnly, replacedStrings, origin);
if (rule == null)
{
rule = CssUnknownRule.Parse(ref css, parent, readOnly, replacedStrings, origin);
}
}
}
}
}
InsertRule(rule);
}
else
{
// must be a selector or error
CssRule rule = CssStyleRule.Parse(ref css, parent, readOnly, replacedStrings, origin);
if (rule != null)
{
InsertRule(rule);
}
else
{
// this is an unknown rule format, possibly a new kind of selector. Try to find the end of it to skip it
int startBracket = css.IndexOf("{", StringComparison.OrdinalIgnoreCase);
int endBracket = css.IndexOf("}", StringComparison.OrdinalIgnoreCase);
int endSemiColon = css.IndexOf(";", StringComparison.OrdinalIgnoreCase);
int endRule;
if (endSemiColon > 0 && endSemiColon < startBracket)
{
endRule = endSemiColon;
}
else
{
endRule = endBracket;
}
if (endRule > -1)
{
css = css.Substring(endRule + 1);
}
else
{
throw new DomException(DomExceptionType.SyntaxErr, "Can not parse the CSS file");
}
}
}
}
}