/// <summary>
/// Retrieves the auto prefixer configuration options from the current application configuration.
/// </summary>
/// <returns>
/// The <see cref="AutoPrefixerOptions"/> from the current application configuration.
/// </returns>
private AutoPrefixerOptions GetAutoPrefixerOptions()
{
if (this.autoPrefixerOptions != null)
{
return(this.autoPrefixerOptions);
}
this.autoPrefixerOptions = new AutoPrefixerOptions
{
Browsers = this.GetCruncherProcessingSection().AutoPrefixer.Browsers.Split(',').Select(p => HttpUtility.HtmlDecode(p.Trim())).ToList(),
Enabled = this.GetCruncherProcessingSection().AutoPrefixer.Enabled,
Cascade = this.GetCruncherProcessingSection().AutoPrefixer.Cascade,
Safe = this.GetCruncherProcessingSection().AutoPrefixer.Safe
};
return(this.autoPrefixerOptions);
}
/// <summary>
/// Retrieves the auto prefixer configuration options from the current application configuration.
/// </summary>
/// <returns>
/// The <see cref="AutoPrefixerOptions"/> from the current application configuration.
/// </returns>
private AutoPrefixerOptions GetAutoPrefixerOptions()
{
if (this.autoPrefixerOptions != null)
{
return(this.autoPrefixerOptions);
}
this.autoPrefixerOptions = new AutoPrefixerOptions {
Enabled = this.GetCruncherProcessingSection().AutoPrefixer.Enabled,
Browsers = this.GetCruncherProcessingSection().AutoPrefixer.Browsers.Split(',').Select(p => HttpUtility.HtmlDecode(p.Trim())).ToList(),
Cascade = this.GetCruncherProcessingSection().AutoPrefixer.Cascade,
Add = true,
Remove = true,
Supports = true,
Flexbox = true,
Grid = true
};
return(this.autoPrefixerOptions);
}
/// <summary>
/// Processes the css request using cruncher and returns the result.
/// </summary>
/// <param name="context">
/// The current context.
/// </param>
/// <param name="minify">
/// Whether to minify the output.
/// </param>
/// <param name="paths">
/// The paths to the resources to crunch.
/// </param>
/// <returns>
/// The <see cref="string"/> representing the processed result.
/// </returns>
public async Task <string> ProcessCssCrunchAsync(HttpContext context, bool minify, params string[] paths)
{
string combinedCSS = string.Empty;
if (paths != null)
{
string key = string.Join(string.Empty, paths).ToMd5Fingerprint();
using (await Locker.LockAsync(key))
{
combinedCSS = (string)CacheManager.GetItem(key);
if (string.IsNullOrWhiteSpace(combinedCSS))
{
StringBuilder stringBuilder = new StringBuilder();
CruncherOptions cruncherOptions = new CruncherOptions
{
MinifyCacheKey = key,
Minify = minify,
CacheFiles = true,
AllowRemoteFiles = CruncherConfiguration.Instance.AllowRemoteDownloads,
RemoteFileMaxBytes = CruncherConfiguration.Instance.MaxBytes,
RemoteFileTimeout = CruncherConfiguration.Instance.Timeout
};
CssCruncher cssCruncher = new CssCruncher(cruncherOptions, context);
AutoPrefixerOptions autoPrefixerOptions = CruncherConfiguration.Instance.AutoPrefixerOptions;
// Loop through and process each file.
foreach (string path in paths)
{
// Local files.
if (PreprocessorManager.Instance.AllowedExtensionsRegex.IsMatch(path))
{
List <string> files = new List <string>();
// Try to get the file by absolute/relative path
if (!ResourceHelper.IsResourceFilenameOnly(path))
{
string cssFilePath = ResourceHelper.GetFilePath(
path,
cruncherOptions.RootFolder,
context);
if (File.Exists(cssFilePath))
{
files.Add(cssFilePath);
}
}
else
{
// Get the path from the server.
// Loop through each possible directory.
foreach (string cssPath in CruncherConfiguration.Instance.CSSPaths)
{
if (!string.IsNullOrWhiteSpace(cssPath) && cssPath.Trim().StartsWith("~/"))
{
DirectoryInfo directoryInfo = new DirectoryInfo(context.Server.MapPath(cssPath));
if (directoryInfo.Exists)
{
IEnumerable <FileInfo> fileInfos =
await
directoryInfo.EnumerateFilesAsync(path, SearchOption.AllDirectories);
files.AddRange(fileInfos.Select(f => f.FullName));
}
}
}
}
if (files.Any())
{
// We only want the first file.
string first = files.FirstOrDefault();
cruncherOptions.RootFolder = Path.GetDirectoryName(first);
stringBuilder.Append(await cssCruncher.CrunchAsync(first));
}
}
else
{
// Remote files.
string remoteFile = this.GetUrlFromToken(path).ToString();
stringBuilder.Append(await cssCruncher.CrunchAsync(remoteFile));
}
}
combinedCSS = stringBuilder.ToString();
// Apply autoprefixer
combinedCSS = cssCruncher.AutoPrefix(combinedCSS, autoPrefixerOptions);
if (minify)
{
combinedCSS = cssCruncher.Minify(combinedCSS);
}
this.AddItemToCache(key, combinedCSS, cssCruncher.FileMonitors);
}
}
}
return(combinedCSS);
}
/// <summary>
/// Post process the input using auto prefixer.
/// </summary>
/// <param name="input">
/// The input CSS.
/// </param>
/// <param name="options">
/// The <see cref="AutoPrefixerOptions"/>.
/// </param>
/// <returns>
/// The <see cref="string"/> containing the post-processed CSS.
/// </returns>
public string AutoPrefix(string input, AutoPrefixerOptions options)
{
return(AutoPrefixerPostprocessor.Transform(input, options));
}
