private static CSSRule ParseFontFace(AtRule rule, ref string OriginalCss)
{
CSSFontFaceRule fontrule = new CSSFontFaceRule();
int startindex = 0;
int endindex = 0;
int endselectindex = -1;
foreach (var item in rule.prelude)
{
if (startindex == 0)
{
startindex = item.startindex;
}
if (item.endindex > endselectindex)
{
endselectindex = item.endindex;
}
}
CSSStyleDeclaration style = ParseDeclarations(rule.block, ref endindex, ref OriginalCss);
fontrule.style = style;
fontrule.StartIndex = startindex;
fontrule.EndIndex = endindex;
fontrule.EndSelectorIndex = endselectindex - fontrule.StartIndex + 1;
return(fontrule);
}
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);
}
private static CSSRule ParseMediaRule(AtRule rule, CSSStyleSheet parentSheet, ref string OriginalCss)
{
CSSMediaRule mediarule = new CSSMediaRule();
mediarule.parentStyleSheet = parentSheet;
string media = string.Empty;
string wholeconditiontext = string.Empty;
int startindex = -1;
int endindex = -1;
int endindexselector = -1;
startindex = rule.prelude[0].startindex;
// the first componentvalue is a preservedtoken and it media.
rule.prelude.RemoveAt(0);
wholeconditiontext = ComponentValueExtension.getString(rule.prelude, ref startindex, ref endindexselector, ref OriginalCss);
foreach (var item in wholeconditiontext.Split(','))
{
mediarule.media.appendMedium(item);
}
CSSRuleList blockrulelist = ParseMediaRuleList(rule.block, ref endindex, mediarule, ref OriginalCss);
if (blockrulelist != null)
{
mediarule.cssRules = blockrulelist;
}
mediarule.conditionText = wholeconditiontext;
//SelectorText is assigned in a different way now.
// mediarule.selectorText = wholeconditiontext; /// NON-W3C.
mediarule.StartIndex = rule.startindex;
if (rule.endindex > endindex)
{
endindex = rule.endindex;
}
mediarule.EndIndex = endindex;
mediarule.EndSelectorIndex = endindexselector - mediarule.StartIndex + 1;
return(mediarule);
}
/// <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);
}
public CssNode ReadAtRule()
{
// ATKEYWORD S* any* [ block | ';' S* ];
// @{keyword} ...
// @import "subs.css";
// @media print {
Read(TokenKind.AtSymbol, LexicalMode.Rule); // Read @
var ruleType = RuleType.Unknown;
var atName = Read(); // read name
ReadTrivia();
switch (atName.Text)
{
case "charset" : ruleType = RuleType.Charset; break;
case "import" : return ReadImportRule();
case "font-face" : return ReadFontFaceRule();
case "media" : return ReadMediaRule();
case "page" : ruleType = RuleType.Page; break;
case "keyframes" : return ReadKeyframesRule();
case "mixin" : return ReadMixinBody();
case "if" : return ReadIfRule();
}
string selectorText = null;
if (current.Kind == TokenKind.Name)
{
selectorText = ReadSpan().ToString();
}
var rule = new AtRule(atName.Text, ruleType, selectorText ?? "");
switch (current.Kind)
{
case TokenKind.BlockStart: ReadBlock(rule); break; // {
case TokenKind.Semicolon: tokenizer.Read(); break; // ;
}
return rule;
}
/// <summary>
/// 5.4.1. Consume a list of rules
/// </summary>
/// <param name="tokenizer"></param>
/// <param name="top_level_flag"></param>
/// <returns></returns>
private List <Rule> ConsumeListOfRules(bool top_level_flag)
{
//To consume a list of rules:
//Create an initially empty list of rules.
List <Rule> rulelist = new List <Rule>();
cssToken token;
while (true)
{
//Repeatedly consume the next input token:
token = ConsumeNextToken();
//<whitespace-token>
if (token.Type == enumTokenType.whitespace)
{
//Do nothing.
}
//<EOF-token>
else if (token.Type == enumTokenType.EOF)
{
//Return the list of rules.
return(rulelist);
}
//<CDO-token>
//<CDC-token>
else if (token.Type == enumTokenType.CDC || token.Type == enumTokenType.CDO)
{
//If the top-level flag is set, do nothing.
if (!top_level_flag)
{
//Otherwise, reconsume the current input token. Consume a qualified rule. If anything is returned, append it to the list of rules.
ReconsumeToken();
QualifiedRule rule = ConsumeQualifiedRule();
if (rule != null)
{
rulelist.Add(rule);
}
}
}
//<at-keyword-token>
else if (token.Type == enumTokenType.at_keyword)
{
//Reconsume the current input token. Consume an at-rule. If anything is returned, append it to the list of rules.
ReconsumeToken();
AtRule rule = ConsumeAtRule();
if (rule != null)
{
rulelist.Add(rule);
}
}
//anything else
else
{
//Reconsume the current input token. Consume a qualified rule. If anything is returned, append it to the list of rules.
ReconsumeToken();
QualifiedRule rule = ConsumeQualifiedRule();
if (rule != null)
{
rulelist.Add(rule);
}
}
}
}
/// <summary>
/// 5.4.2. Consume an at-rule
/// </summary>
/// <returns></returns>
private AtRule ConsumeAtRule()
{
//To consume an at-rule:
//Create a new at-rule with its name set to the value of the current input token, its prelude initially set to an empty list, and its value initially set to nothing.
AtRule rule = new AtRule();
int startindex = -1;
cssToken token = null;
while (true)
{
//Repeatedly consume the next input token:
token = ConsumeNextToken();
if (startindex == -1)
{
startindex = token.startIndex;
}
//<semicolon-token>
//<EOF-token>
if (token.Type == enumTokenType.semicolon || token.Type == enumTokenType.EOF)
{
//Return the at-rule.
rule.startindex = startindex;
rule.endindex = token.endIndex;
if (token.Type == enumTokenType.EOF)
{
rule.endindex = rule.endindex - 1;
}
return(rule);
}
//<{-token>
else if (token.Type == enumTokenType.curly_bracket_left)
{
//Consume a simple block and assign it to the at-rule’s block. Return the at-rule.
SimpleBlock simpleblock = ConsumeSimpleBlock();
simpleblock.startindex = token.startIndex;
rule.block = simpleblock;
rule.startindex = startindex;
rule.endindex = simpleblock.endindex;
return(rule);
}
//simple block with an associated token of <{-token>
//Assign the block to the at-rule’s block. Return the at-rule.
///TODO: ???? check what does this means???
//anything else
else
{
//Reconsume the current input token. Consume a component value. Append the returned value to the at-rule’s prelude.
ReconsumeToken();
ComponentValue value = ConsumeComponentValue();
rule.prelude.Add(value);
}
}
}
