/// <summary>
/// This will never return null, it will raise an exception if unable to satisfy the request
/// </summary>
public ITextFileLoader Get()
{
var scopingHtmlTagReplaceString = "REPLACEME";
ITextFileLoader singleFileLoader = new LessCssOpeningHtmlTagRenamer(
_contentLoader,
scopingHtmlTagReplaceString
);
var sourceMappingMarkerIdGenerator = new SourceMappingMarkerIdGenerator();
if (_sourceMappingMarkerInjection == SourceMappingMarkerInjectionOptions.Inject)
{
singleFileLoader = new LessCssLineNumberingTextFileLoader(
new LessCssCommentRemovingTextFileLoader(singleFileLoader),
sourceMappingMarkerIdGenerator.MarkerGenerator,
selector => selector != scopingHtmlTagReplaceString // Don't insert marker ids on wrapper selectors that will be removed
);
}
return(new MediaQueryGroupingCssLoader(
new DotLessCssCssLoader(
new SameFolderImportFlatteningCssLoader(
singleFileLoader,
_sourceMappingMarkerInjection == SourceMappingMarkerInjectionOptions.Inject
? SameFolderImportFlatteningCssLoader.ContentLoaderCommentRemovalBehaviourOptions.CommentsAreAlreadyRemoved
: SameFolderImportFlatteningCssLoader.ContentLoaderCommentRemovalBehaviourOptions.ContentIsUnprocessed,
_errorBehaviour,
_errorBehaviour,
_logger
),
() => sourceMappingMarkerIdGenerator.GetInsertedMarkerIds(),
scopingHtmlTagReplaceString,
_errorBehaviour,
_logger
)
));
}
/// <summary>
/// This will never return null, it will raise an exception if unable to satisfy the request
/// </summary>
public ITextFileLoader Get()
{
ITextFileLoader singleFileLoader = new LessCssKeyFrameScoper(_contentLoader);
var sourceMappingMarkerIdGenerator = new SourceMappingMarkerIdGenerator();
if (_sourceMappingMarkerInjection == SourceMappingMarkerInjectionOptions.Inject)
{
singleFileLoader = new LessCssLineNumberingTextFileLoader(
new LessCssCommentRemovingTextFileLoader(singleFileLoader),
sourceMappingMarkerIdGenerator.MarkerGenerator,
null // optionalSelectorMarkerInsertionCondition (null => insert markers for all selectors)
);
}
return(new DotLessCssCssLoader(
new SameFolderImportFlatteningCssLoader(
singleFileLoader,
_sourceMappingMarkerInjection == SourceMappingMarkerInjectionOptions.Inject
? SameFolderImportFlatteningCssLoader.ContentLoaderCommentRemovalBehaviourOptions.CommentsAreAlreadyRemoved
: SameFolderImportFlatteningCssLoader.ContentLoaderCommentRemovalBehaviourOptions.ContentIsUnprocessed,
_errorBehaviour,
_errorBehaviour,
_logger
),
() => sourceMappingMarkerIdGenerator.GetInsertedMarkerIds(),
null, // optionalTagNameToRemove (null => no selectors need removing)
_errorBehaviour,
_logger
));
}
/// <summary>
/// This will throw an exception for null content or if otherwise unable to satisfy the request, it will never return null
/// </summary>
private string Process(string relativePath, string content)
{
if (string.IsNullOrWhiteSpace(relativePath))
{
throw new ArgumentException($"Null/blank {nameof(relativePath)} specified");
}
if (content == null)
{
throw new ArgumentNullException("content");
}
relativePath = relativePath.Trim();
if (relativePath.EndsWith(".css", StringComparison.OrdinalIgnoreCase))
{
relativePath = relativePath.Substring(0, relativePath.Length - 4);
}
else if (relativePath.EndsWith(".less", StringComparison.OrdinalIgnoreCase))
{
relativePath = relativePath.Substring(0, relativePath.Length - 5);
}
var prefixToInsert = SourceMappingMarkerIdGenerator.TryToGetHtmlIdFriendlyVersion(relativePath);
if (prefixToInsert == null)
{
// If the path string doesn't contain any content that may be used as a "custom ident" then make something up because we need to use something as
// the prefix, otherwise the animation won't be scoped to the current files
prefixToInsert = "scope" + relativePath.GetHashCode();
}
// Note: Since we have enumerate the segments set twice (if any animation names are found to be renamed) then I considered calling ToArray on it so that the parsing
// work would only be done once - however, this means that the content has to be full loaded into an array in memory and I don't have any information that indicates
// that the additional memory use would be a worthwhile tradeoff for the double-parsing work (the parsing isn't very expensive and so doing it twice isn't necessarily
// the worst thing in the world). If no animation names are found that need to be renamed then the parsing work will only be performed once. Similar logic is applied
// to the result of the RewriteKeyFrameNames method - it needs to be executed once to determine whether any animation names need to be changed and (if any are found)
// then it will be executed a second time when RewriteAnimationNames is called (but the RewriteKeyFrameNames work isn't very expensive and so there isn't necessarily
// any harm in doing it twice).
var segments = Parser.ParseLESS(content);
var rewrittenNames = new Dictionary <string, string>(StringComparer.OrdinalIgnoreCase); // Case insensitive (see https://developer.mozilla.org/en-US/docs/Web/CSS/custom-ident)
segments = RewriteKeyFrameNames(
segments,
nestedAnimationName =>
{
var rewrittedName = prefixToInsert + "_" + nestedAnimationName;
rewrittenNames[nestedAnimationName] = rewrittedName;
return(rewrittedName);
}
);
ForceEvaluation(segments);
if (!rewrittenNames.Any())
{
return(content);
}
segments = RewriteAnimationNames(
segments,
animationName => rewrittenNames.ContainsKey(animationName) ? rewrittenNames[animationName] : animationName
);
var rewrittenContentBuilder = new StringBuilder();
foreach (var segment in segments)
{
rewrittenContentBuilder.Append(segment.Value);
}
return(rewrittenContentBuilder.ToString());
}
