private string RewriteUrls(string content, string path)
{
SassCompilationContext context = Context;
var compiler = (SassCompiler)context.Compiler;
path = compiler.GetBasePath(path, context.RootPath);
return(compiler.RewriteUrls(content, path, context));
}
public bool FileExists(string path)
{
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
SassCompilationContext context = Context;
context.CancellationToken.ThrowIfCancellationRequested();
Microsoft.Extensions.FileProviders.IFileInfo fileInfo = context.FileProvider.GetFileInfo(path);
return(fileInfo.Exists && !fileInfo.IsDirectory);
}
public string ReadFile(string path)
{
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
SassCompilationContext context = Context;
context.CancellationToken.ThrowIfCancellationRequested();
using (Stream stream = context.FileProvider.GetFileInfo(path).CreateReadStream())
using (var reader = new StreamReader(stream))
return(reader.ReadToEnd());
}
public Task <SassCompilationResult> CompileAsync(string content, string virtualPathPrefix, string filePath, IFileProvider fileProvider, CancellationToken token)
{
if (content == null)
{
throw new ArgumentNullException(nameof(content));
}
token.ThrowIfCancellationRequested();
string rootPath;
if (filePath != null)
{
var index = filePath.LastIndexOf('/');
rootPath = filePath.Substring(0, index + 1);
}
else
{
filePath = rootPath = "/";
}
CompilationResult compilationResult;
using (var context = new SassCompilationContext(this, rootPath, fileProvider, token))
{
content = RewriteUrls(content, string.Empty, context);
try
{
compilationResult = LibSassHost.SassCompiler.Compile(content, filePath);
}
catch (Exception ex)
{
_logger.LogWarning($"Sass compilation of '{{FILEPATH}}' failed.{Environment.NewLine}{{REASON}}",
(filePath ?? "(content)"),
ex.Message);
compilationResult = null;
}
}
return(Task.FromResult(
compilationResult != null ?
new SassCompilationResult(compilationResult.CompiledContent, compilationResult.IncludedFilePaths) :
SassCompilationResult.Failure));
}
internal static void SetCompilationContext(SassCompilationContext context)
{
s_compilationContext.Value = context;
}
protected internal virtual string RewriteUrls(string content, string basePath, SassCompilationContext context)
{
// 1) url values can usually be SASS expressions, there's no easy way to decide,
// so only relative paths starting with "./" or "../" are rebased
// 2) urls ending with '.css' must be rebased as they are not included
// https://stackoverflow.com/questions/7111610/import-regular-css-file-in-scss-file
return(s_rewriteUrlsRegex.Replace(content,
m =>
{
var value = m.Groups["url"].Value;
var quote = StringUtils.RemoveQuotes(ref value);
return string.Concat(
m.Groups["before"].Value,
quote, RebaseUrl(value, basePath, context), quote,
m.Groups["after"].Value);
}));
}
protected internal virtual string RebaseUrl(string value, string basePath, SassCompilationContext context)
{
return(basePath + value);
}