/// <summary>
/// This method encapsulates both client- and server- side CSS processing.
/// </summary>
/// <param name="input">Stylesheet code in dynamic language syntax</param>
/// <param name="language">CSS dynamic language</param>
/// <param name="output">Plain CSS output</param>
/// <param name="hiddenField">Hidden field that holds the result of client-side compilation</param>
public static string ProcessCss(string input, string language, out string output, HiddenField hiddenField)
{
string errorMessage = String.Empty;
CssPreprocessor prep = CssStylesheetInfoProvider.GetCssPreprocessor(language);
EnsureClientSideCompiledCss(hiddenField);
if (String.IsNullOrEmpty(CssPreprocessor.CurrentCompiledValue) || ((prep != null) && !prep.UsesClientSideCompilation))
{
// Parse the style sheet code server-side
errorMessage = CssStylesheetInfoProvider.TryParseCss(input, language, out output);
if (String.IsNullOrEmpty(errorMessage))
{
// Store last result
CssPreprocessor.CurrentCompiledValue = output;
}
}
else
{
// Use client-side parsed code
output = CssPreprocessor.CurrentCompiledValue;
// Check if client-side process result contains special sequence indicating that parser produced no output (this may not be an error)
if (output.EqualsCSafe(BLANKOUTPUT))
{
output = String.Empty;
}
else
{
if ((prep != null) && (prep.GetErrorDescription != null))
{
// Handle error
errorMessage = prep.GetErrorDescription(output);
if (!String.IsNullOrEmpty(errorMessage))
{
output = String.Empty;
}
}
}
}
return(errorMessage);
}
