/// <summary>
/// Parse given stylesheet for media CSS blocks<br/>
/// This blocks are added under the specific media block they are found.
/// </summary>
/// <param name="cssData">the CSS data to fill with parsed CSS objects</param>
/// <param name="atrule">the @media rule to parse</param>
private void ParseMediaAtRule(CssData cssData, string atrule)
{
//Extract specified media types
MatchCollection types = RegexParserUtils.Match(RegexParserUtils.CssMediaTypes, atrule);
if (types.Count == 1)
{
string line = types[0].Value;
//Get blocks inside the at-rule
var insideBlocks = RegexParserUtils.Match(RegexParserUtils.CssBlocks, atrule);
//Get specified media types in the at-rule
string[] mediaTypes = line.Substring(6, line.Length - 7).Split(_cssWhitespace, StringSplitOptions.RemoveEmptyEntries);
//Scan media types
foreach (string mediaType in mediaTypes)
{
//Scan blocks and feed them to the style sheet
foreach (Match insideBlock in insideBlocks)
{
FeedStyleBlock(cssData, insideBlock.Value, mediaType);
}
}
}
}
/// <summary>
/// Parse imports and return urls to imported stylesheets
/// </summary>
/// <param name="stylesheet">The stylesheet to parse</param>
/// <returns>CSS imports</returns>
private List <string> ParseImportStatement(string stylesheet)
{
int startIdx = 0;
List <string> imports = new List <string>(1);
MatchCollection importsCollection = RegexParserUtils.Match(RegexParserUtils.CssImportRule, stylesheet);
foreach (Match import in importsCollection)
{
string importValue = import.Value;
int urlStartIdx = importValue.IndexOf("url(", StringComparison.InvariantCultureIgnoreCase);
if (urlStartIdx >= 0)
{
urlStartIdx += 4;
int urlEndIdx = importValue.IndexOf(')', urlStartIdx);
if (urlEndIdx > -1)
{
urlEndIdx -= 1;
while (urlStartIdx < urlEndIdx && (char.IsWhiteSpace(importValue[urlStartIdx]) || importValue[urlStartIdx] == '\'' || importValue[urlStartIdx] == '"'))
{
urlStartIdx++;
}
while (urlStartIdx < urlEndIdx && (char.IsWhiteSpace(importValue[urlEndIdx]) || importValue[urlEndIdx] == '\'' || importValue[urlEndIdx] == '"'))
{
urlEndIdx--;
}
if (urlStartIdx <= urlEndIdx)
{
string url = importValue.Substring(urlStartIdx, urlEndIdx - urlStartIdx + 1);
imports.Add(url);
}
}
}
else
{
urlStartIdx = importValue.IndexOf('"');
urlStartIdx = urlStartIdx == -1 ? importValue.IndexOf('\'') : urlStartIdx;
if (urlStartIdx >= 0)
{
int urlEndIdx = importValue.LastIndexOf('"');
urlEndIdx = urlEndIdx == -1 ? importValue.IndexOf('\'') : urlEndIdx;
string url = importValue.Substring(urlStartIdx + 1, urlEndIdx - urlStartIdx - 1);
imports.Add(url);
}
}
}
return(imports);
}
private void ParsePageAtRule(CssData cssData, string atrule)
{
//Get blocks inside the at-rule
var insideBlocks = RegexParserUtils.Match(RegexParserUtils.CssBlocks, atrule);
// TODO: add page rules
int startIdx = 0;
string nestedAtrule;
while ((nestedAtrule = RegexParserUtils.GetCssAtRules(atrule, ref startIdx)) != null)
{
// TODO: add margin box rules
}
}
/// <summary>
/// Parse given stylesheet for media CSS blocks<br/>
/// This blocks are added under the specific media block they are found.
/// </summary>
/// <param name="cssData">the CSS data to fill with parsed CSS objects</param>
/// <param name="stylesheet">the stylesheet to parse</param>
private void ParseMediaStyleBlocks(CssData cssData, string stylesheet)
{
int startIdx = 0;
string atrule;
while ((atrule = RegexParserUtils.GetCssAtRules(stylesheet, ref startIdx)) != null)
{
//Just process @media rules
if (!atrule.StartsWith("@media", StringComparison.InvariantCultureIgnoreCase))
{
continue;
}
//Extract specified media types
MatchCollection types = RegexParserUtils.Match(RegexParserUtils.CssMediaTypes, atrule);
if (types.Count == 1)
{
string line = types[0].Value;
if (line.StartsWith("@media", StringComparison.InvariantCultureIgnoreCase) && line.EndsWith("{"))
{
//Get specified media types in the at-rule
string[] media = line.Substring(6, line.Length - 7).Split(' ');
//Scan media types
foreach (string t in media)
{
if (!String.IsNullOrEmpty(t.Trim()))
{
//Get blocks inside the at-rule
var insideBlocks = RegexParserUtils.Match(RegexParserUtils.CssBlocks, atrule);
//Scan blocks and feed them to the style sheet
foreach (Match insideBlock in insideBlocks)
{
FeedStyleBlock(cssData, insideBlock.Value, t.Trim());
}
}
}
}
}
}
}