private static CSSRule ParseAtRule(AtRule rule, CSSStyleSheet parentSheet, string baseurl, bool downloadImportRule, ref string OriginalCss)
{
/// the first item in rule is the atkeyword.
if (rule.prelude[0].Type == CompoenentValueType.preservedToken)
{
PreservedToken token = rule.prelude[0] as PreservedToken;
if (token.token.Type == enumTokenType.at_keyword)
{
at_keyword_token keywordToken = token.token as at_keyword_token;
if (keywordToken.value.ToLower() == "import")
{
return(ParseImportRule(rule, baseurl, downloadImportRule, ref OriginalCss));
}
else if (keywordToken.value.ToLower() == "media")
{
return(ParseMediaRule(rule, parentSheet, ref OriginalCss));
}
else if (keywordToken.value.ToLower() == "font-face")
{
return(ParseFontFace(rule, ref OriginalCss));
}
}
}
return(null);
}
/// <summary>
/// 5.4.6. Consume a component value
/// </summary>
/// <returns></returns>
private ComponentValue ConsumeComponentValue()
{
//Consume the next input token.
cssToken token = ConsumeNextToken();
//If the current input token is a <{-token>, <[-token>, or <(-token>, consume a simple block and return it.
if (token.Type == enumTokenType.curly_bracket_left || token.Type == enumTokenType.square_bracket_left || token.Type == enumTokenType.round_bracket_left)
{
SimpleBlock simpleblock = ConsumeSimpleBlock();
simpleblock.startindex = token.startIndex;
return(simpleblock);
}
//Otherwise, if the current input token is a <function-token>, consume a function and return it.
else if (token.Type == enumTokenType.function)
{
Function func = ConsumeFunction();
func.startindex = token.startIndex;
return(func);
}
else
{
//Otherwise, return the current input token.
PreservedToken preservedtoken = new PreservedToken();
preservedtoken.token = token;
preservedtoken.startindex = token.startIndex;
preservedtoken.endindex = token.endIndex;
return(preservedtoken);
}
}
/// <summary>
/// Consume a list of declaration from a simple block.
/// </summary>
/// <param name="block"></param>
/// <returns></returns>
private static CSSStyleDeclaration ParseDeclarations(SimpleBlock block, ref int endindex, ref string CssText)
{
CSSStyleDeclaration declarations = new CSSStyleDeclaration();
string csstext = string.Empty;
CSSDeclaration onedeclaration = null;
bool colonfound = false; // check value before or after colon.
int valuecount = block.value.Count;
for (int i = 0; i < valuecount; i++)
{
ComponentValue item = block.value[i];
if (item.endindex > endindex)
{
endindex = item.endindex;
}
if (item.Type == CompoenentValueType.preservedToken)
{
PreservedToken token = item as PreservedToken;
if (token.token.Type == enumTokenType.ident)
{
// the first ident is the start of one declaration.
if (onedeclaration == null)
{
onedeclaration = new CSSDeclaration();
ident_token identtoken = token.token as ident_token;
onedeclaration.propertyname = identtoken.value;
colonfound = false;
}
else
{
onedeclaration.value += token.token.GetString(ref CssText);
}
}
else if (token.token.Type == enumTokenType.semicolon || token.token.Type == enumTokenType.EOF)
{
// this is the end of one declaration.
declarations.item.Add(onedeclaration);
onedeclaration = null;
colonfound = false;
}
else if (colonfound == false)
{
if (token.token.Type == enumTokenType.colon)
{
colonfound = true;
}
else if (token.token.Type == enumTokenType.whitespace)
{
// white space do nothing.
}
else
{
// the next one must be white space or colon, otherwise, error.
//TODO: onError.
}
}
else if (token.token.Type == enumTokenType.delim && ((delim_token)token.token).value == '!')
{
if ((i + 1) < valuecount)
{
if (block.value[i + 1].Type == CompoenentValueType.preservedToken)
{
PreservedToken important = block.value[i + 1] as PreservedToken;
if (important.token.Type == enumTokenType.ident)
{
ident_token importantident = important.token as ident_token;
if (importantident.value.ToLower() == "important" && onedeclaration != null)
{
onedeclaration.important = true;
}
}
}
// has to consume the important now, because value has been processed.
i = i + 1;
}
}
else
{
/// append the value to declaration value.
if (onedeclaration != null)
{
onedeclaration.value += token.token.GetString(ref CssText);
}
}
}
else if (item.Type == CompoenentValueType.function)
{
Function func = item as Function;
if (onedeclaration == null)
{
onedeclaration = new CSSDeclaration();
onedeclaration.propertyname = func.getString(ref CssText);
colonfound = false;
}
else
{
if (colonfound)
{
onedeclaration.value += func.getString(ref CssText);
}
else
{
onedeclaration.propertyname += func.getString(ref CssText);
}
}
}
}
if (onedeclaration != null && !string.IsNullOrEmpty(onedeclaration.propertyname))
{
declarations.item.Add(onedeclaration);
onedeclaration = null;
colonfound = false;
}
if (block.endindex > endindex)
{
endindex = block.endindex;
}
return(declarations);
}
/// <summary>
/// consume a list of cssrule from simpleblock,
/// Recursive.
/// </summary>
/// <param name="block"></param>
/// <returns></returns>
private static CSSRuleList ParseMediaRuleList(SimpleBlock block, ref int endindex, CSSMediaRule parentmediarule, ref string OriginalCss)
{
int count = block.value.Count;
CSSRuleList rulelist = new CSSRuleList();
MediaRuleParseState state = MediaRuleParseState.init;
CSSStyleRule stylerule = null;
CSSMediaRule mediarule = null;
string media = string.Empty;
string wholeconditiontext = string.Empty;
int startindex = -1;
for (int i = 0; i < count; i++)
{
if (block.value[i].endindex > endindex)
{
endindex = block.value[i].endindex;
}
if (startindex < 0)
{
startindex = block.value[i].startindex;
}
switch (state)
{
case MediaRuleParseState.init:
{
if (block.value[i].Type == CompoenentValueType.preservedToken)
{
PreservedToken pretoken = block.value[i] as PreservedToken;
if (pretoken.token.Type == enumTokenType.whitespace)
{
// ignored whitespace at the beginning.
}
else if (pretoken.token.Type == enumTokenType.at_keyword)
{
// at keyword token, only handle media now.
// others to be added.
at_keyword_token token = pretoken.token as at_keyword_token;
if (token.value.ToLower() == "media")
{
state = MediaRuleParseState.mediarule;
i = i - 1; // reconsume to have correct startindex.
}
else
{
// other at rules.
state = MediaRuleParseState.OtherAtRule;
i = i - 1;
}
}
/// else treat as regular style rule.
else
{
state = MediaRuleParseState.stylerule;
i = i - 1; // reconsume.
}
}
break;
}
case MediaRuleParseState.stylerule:
{
if (stylerule == null)
{
stylerule = new CSSStyleRule();
startindex = block.value[i].startindex;
}
if (block.value[i].Type == CompoenentValueType.preservedToken)
{
PreservedToken pretoken = block.value[i] as PreservedToken;
// not a defined way to parse the selector, assembly them back and give it to selector module.
// in the new way of getting selectorText, we have not need to assign it any more.
//stylerule.selectorText += pretoken.token.getString();
}
else if (block.value[i].Type == CompoenentValueType.simpleBlock)
{
int endselectorindex = block.value[i].startindex;
stylerule.style = ParseDeclarations(block.value[i] as SimpleBlock, ref endindex, ref OriginalCss);
stylerule.StartIndex = startindex;
stylerule.EndIndex = endindex;
stylerule.EndSelectorIndex = endselectorindex - stylerule.StartIndex;
stylerule.parentRule = parentmediarule;
stylerule.parentStyleSheet = parentmediarule.parentStyleSheet;
rulelist.appendRule(stylerule);
stylerule = null;
state = MediaRuleParseState.init;
startindex = -1;
}
break;
}
case MediaRuleParseState.mediarule:
{
if (mediarule == null)
{
mediarule = new CSSMediaRule();
media = string.Empty;
wholeconditiontext = string.Empty;
startindex = block.value[i].startindex;
mediarule.parentStyleSheet = parentmediarule.parentStyleSheet;
mediarule.parentRule = parentmediarule;
}
if (block.value[i].Type == CompoenentValueType.preservedToken)
{
PreservedToken pretoken = block.value[i] as PreservedToken;
if (pretoken.token.Type == enumTokenType.comma)
{
if (!string.IsNullOrEmpty(media))
{
mediarule.media.appendMedium(media.Trim());
media = string.Empty;
}
wholeconditiontext += ",";
}
else
{
// can be delim token.
if (string.IsNullOrEmpty(media) && pretoken.token.Type == enumTokenType.whitespace)
{
// the start of whitespace will be ignored.
}
else
{
media += pretoken.token.GetString(ref OriginalCss);
wholeconditiontext += pretoken.token.GetString(ref OriginalCss);
}
}
}
else if (block.value[i].Type == CompoenentValueType.simpleBlock)
{
CSSRuleList mediarulelist = ParseMediaRuleList(block.value[i] as SimpleBlock, ref endindex, mediarule, ref OriginalCss);
mediarule.cssRules = mediarulelist;
if (!string.IsNullOrEmpty(media))
{
mediarule.media.appendMedium(media.Trim());
wholeconditiontext += media;
}
mediarule.conditionText = wholeconditiontext;
mediarule.selectorText = wholeconditiontext; /// NON-W3C.
mediarule.StartIndex = startindex;
mediarule.EndIndex = endindex;
rulelist.appendRule(mediarule);
state = 0;
mediarule = null;
media = string.Empty;
wholeconditiontext = string.Empty;
startindex = -1;
}
break;
}
case MediaRuleParseState.OtherAtRule:
{
//if (mediarule == null)
//{
// mediarule = new CSSMediaRule();
// media = string.Empty;
// wholeconditiontext = string.Empty;
// startindex = block.value[i].startindex;
// mediarule.parentStyleSheet = parentmediarule.parentStyleSheet;
// mediarule.parentRule = parentmediarule;
//}
if (block.value[i].Type == CompoenentValueType.preservedToken)
{
//PreservedToken pretoken = block.value[i] as PreservedToken;
//if (pretoken.token.Type == enumTokenType.comma)
//{
// if (!string.IsNullOrEmpty(media))
// {
// mediarule.media.appendMedium(media.Trim());
// media = string.Empty;
// }
// wholeconditiontext += ",";
//}
//else
//{
// // can be delim token.
// if (string.IsNullOrEmpty(media) && pretoken.token.Type == enumTokenType.whitespace)
// {
// // the start of whitespace will be ignored.
// }
// else
// {
// media += pretoken.token.GetString(ref OriginalCss);
// wholeconditiontext += pretoken.token.GetString(ref OriginalCss);
// }
//}
}
else if (block.value[i].Type == CompoenentValueType.simpleBlock)
{
// not implemented now.
//CSSRuleList mediarulelist = ParseMediaRuleList(block.value[i] as SimpleBlock, ref endindex, mediarule, ref OriginalCss);
//mediarule.cssRules = mediarulelist;
//if (!string.IsNullOrEmpty(media))
//{
// mediarule.media.appendMedium(media.Trim());
// wholeconditiontext += media;
//}
//mediarule.conditionText = wholeconditiontext;
//mediarule.selectorText = wholeconditiontext; /// NON-W3C.
//mediarule.StartIndex = startindex;
//mediarule.EndIndex = endindex;
//rulelist.appendRule(mediarule);
state = MediaRuleParseState.init;
startindex = -1;
}
break;
}
default:
break;
}
}
if (stylerule != null)
{
if (stylerule.EndIndex > stylerule.StartIndex)
{
rulelist.appendRule(stylerule);
}
stylerule = null;
}
if (mediarule != null)
{
rulelist.appendRule(mediarule);
mediarule = null;
}
return(rulelist);
}
/// <summary>
/// The @import at-rule is a simple statement. After its name, it takes a single string or url() function to indicate the stylesheet that it should import.
/// </summary>
/// <param name="rule"></param>
/// <returns></returns>
private static CSSRule ParseImportRule(AtRule rule, string baseurl, bool downloadImportRule, ref string OriginalCss)
{
/// the import starts with import atkeyword token.
/// it should have been checked before calling this method, can be ignored.
PreservedToken token = rule.prelude[0] as PreservedToken;
int count = rule.prelude.Count;
CSSImportRule importrule = new CSSImportRule();
string media = string.Empty;
int startindex = -1;
int endindex = -1;
for (int i = 0; i < count; i++)
{
if (startindex < 0)
{
startindex = rule.prelude[i].startindex;
}
if (rule.prelude[i].endindex > endindex)
{
endindex = rule.prelude[i].endindex;
}
if (rule.prelude[i].Type == CompoenentValueType.preservedToken)
{
PreservedToken preservedToken = rule.prelude[i] as PreservedToken;
/// ignore the whitespace and at-keyword token.
if (preservedToken.token.Type == enumTokenType.at_keyword || (string.IsNullOrEmpty(importrule.href) && preservedToken.token.Type == enumTokenType.whitespace))
{
continue;
}
if (string.IsNullOrEmpty(importrule.href))
{
if (preservedToken.token.Type == enumTokenType.String)
{
string_token stringtoken = preservedToken.token as string_token;
string url = string.Empty;
if (string.IsNullOrEmpty(baseurl))
{
url = stringtoken.value;
}
else
{
url = PathHelper.combine(baseurl, stringtoken.value);
}
importrule.href = url;
if (downloadImportRule && !string.IsNullOrEmpty(url))
{
importrule.stylesheet = CSSParser.ParseCSSStyleSheetFromUrl(url);
}
}
else if (preservedToken.token.Type == enumTokenType.url)
{
url_token urltoken = preservedToken.token as url_token;
string url = string.Empty;
if (string.IsNullOrEmpty(baseurl))
{
url = urltoken.value;
}
else
{
url = PathHelper.combine(baseurl, urltoken.value);
}
importrule.href = url;
if (downloadImportRule && !string.IsNullOrEmpty(url))
{
importrule.stylesheet = CSSParser.ParseCSSStyleSheetFromUrl(url);
}
}
else
{
// must start with a string or url token as the next.
string error = "this is an error";
}
}
else
{
// the import rule has href already, next is the media rules.
if (preservedToken.token.Type == enumTokenType.comma || preservedToken.token.Type == enumTokenType.semicolon)
{
if (!string.IsNullOrEmpty(media))
{
importrule.media.appendMedium(media.Trim());
media = string.Empty;
}
}
else
{
// can be delim token.
if (string.IsNullOrEmpty(media) && preservedToken.token.Type == enumTokenType.whitespace)
{
// the start of whitespace will be ignored.
}
else
{
media += preservedToken.token.GetString(ref OriginalCss);
}
}
}
}
else if (rule.prelude[i].Type == CompoenentValueType.function)
{
Function urlfunction = rule.prelude[i] as Function;
string href = string.Empty;
if (urlfunction.name == "url")
{
foreach (var item in urlfunction.value)
{
if (item.Type == CompoenentValueType.preservedToken)
{
PreservedToken pretoken = item as PreservedToken;
if (pretoken.token.Type == enumTokenType.String)
{
string_token stringtoken = pretoken.token as string_token;
href += stringtoken.value;
}
}
}
}
if (!string.IsNullOrEmpty(href))
{
importrule.href = href;
}
}
else if (rule.prelude[i].Type == CompoenentValueType.simpleBlock)
{
// simple block is the block like screen and (min-width:300);
SimpleBlock block = rule.prelude[i] as SimpleBlock;
string mediarule = string.Empty;
foreach (var item in block.value)
{
if (item.Type == CompoenentValueType.preservedToken)
{
PreservedToken pretoken = item as PreservedToken;
mediarule += pretoken.token.GetString(ref OriginalCss);
if (token.token.endIndex > endindex)
{
endindex = token.token.endIndex;
}
}
}
if (block.token.Type == enumTokenType.round_bracket_left || block.token.Type == enumTokenType.round_bracket_right)
{
mediarule = "(" + mediarule + ")";
}
else if (block.token.Type == enumTokenType.square_bracket_left || block.token.Type == enumTokenType.square_bracket_right)
{
mediarule = "[" + mediarule + "]";
}
else if (block.token.Type == enumTokenType.curly_bracket_left || block.token.Type == enumTokenType.curly_bracket_right)
{
mediarule = "{" + mediarule + "}";
}
media += mediarule;
}
}
if (!string.IsNullOrEmpty(media))
{
importrule.media.appendMedium(media.Trim());
media = string.Empty;
}
importrule.StartIndex = startindex;
if (rule.endindex > endindex)
{
endindex = rule.endindex;
}
importrule.EndIndex = endindex;
int endselectorindex = rule.prelude[0].endindex + 1;
///import rule does not have one extra char like {
// importrule.EndSelectorIndex = endselectorindex - importrule.StartIndex + 1;
importrule.EndSelectorIndex = endselectorindex - importrule.StartIndex;
return(importrule);
}
