public static string CompressJS(Stream stream)
{
var jsMin = new JSMin();
if (!stream.CanRead)
{
throw new InvalidOperationException("Cannot read input stream");
}
if (stream.CanSeek)
{
stream.Position = 0;
}
return(jsMin.Minify(new StreamReader(stream)));
}
/// <summary>
/// Compress HTML by removing unnecessary whitespace and comments
/// </summary>
/// <param name="reader">Stream of <see cref="HtmlNode"/> to minify</param>
/// <param name="settings">Settings to control how the HTML is compressed</param>
/// <returns>Stream of minified <see cref="HtmlNode"/></returns>
public static IEnumerable <HtmlNode> Minify(this IEnumerable <HtmlNode> reader, HtmlMinifySettings settings = null)
{
settings = settings ?? HtmlMinifySettings.ReadOnlyDefault;
var state = MinifyState.LastCharWasSpace;
var tagState = ContainingTag.None;
int trimStart;
int trimEnd;
StringBuilder builder = null;
var jsMin = new JSMin();
foreach (var node in reader)
{
if (node.Type == HtmlTokenType.Comment)
{
// Ignore comments, unless they are conditional
if (node.Value.StartsWith("[if") || node.Value.EndsWith("endif]"))
{
yield return(node);
}
}
else if (node.Type == HtmlTokenType.Text)
{
if (node.Value == "" || node.Value == null)
{
// do nothing
}
else if (tagState == ContainingTag.WhitespacePreserve)
{
yield return(node);
state = MinifyState.LastCharWasSpace;
}
else if (tagState == ContainingTag.Script)
{
if (builder == null)
{
builder = Pool.NewStringBuilder();
}
builder.Append(node.Value);
}
else
{
TrimIndices(node.Value, out trimStart, out trimEnd);
if (trimEnd < 0)
{
// Do nothing for an empty or null string
}
else if (trimEnd < trimStart)
{
if (state == MinifyState.Compressed)
{
state = MinifyState.SpaceNeeded;
}
}
else
{
if (state == MinifyState.SpaceNeeded && trimStart == 0)
{
yield return(new HtmlText(node.Position, " "));
state = MinifyState.LastCharWasSpace;
}
if (state == MinifyState.LastCharWasSpace ||
state == MinifyState.InlineStartAfterSpace ||
trimStart == 0)
{
yield return(new HtmlText(node.Position, GetCompressedString(node.Value, trimStart, trimEnd)));
}
else
{
yield return(new HtmlText(node.Position, GetCompressedString(node.Value, trimStart - 1, trimEnd)));
}
if (trimEnd < node.Value.Length - 1)
{
state = MinifyState.SpaceNeeded;
}
else
{
state = MinifyState.Compressed;
}
}
}
}
else
{
if (state == MinifyState.SpaceNeeded)
{
if (node.Type == HtmlTokenType.EndTag && !settings.InlineElements.Contains(node.Value))
{
state = MinifyState.LastCharWasSpace;
}
else
{
// Inline elements can render spaces, otherwise spaces shouldn't be rendered between elements
if ((node.Type == HtmlTokenType.StartTag || node.Type == HtmlTokenType.EndTag) &&
settings.InlineElements.Contains(node.Value))
{
yield return(new HtmlText(node.Position, " "));
}
if (settings.PreserveSurroundingSpaceTags.Contains(node.Value))
{
state = MinifyState.Compressed;
}
else
{
state = MinifyState.LastCharWasSpace;
}
}
}
if (node.Type == HtmlTokenType.EndTag && node.Value == "script" && builder != null)
{
yield return(new HtmlText(node.Position, Js.Minify(new TextSource(builder))));
builder.ToPool();
builder = null;
}
var tag = node as HtmlStartTag;
if (tag != null)
{
if (tag.Attributes.Any(a => a.Key == "style" || a.Key == "class"))
{
var newTag = new HtmlStartTag(tag.Position, tag.Value);
foreach (var attr in tag.Attributes)
{
if (attr.Key == "style")
{
newTag.Add(attr.Key, TrimStyleString(attr.Value));
}
else if (attr.Key == "class")
{
newTag.Add(attr.Key, GetCompressedString(attr.Value));
}
else
{
newTag.Attributes.Add(attr);
}
}
newTag.IsSelfClosing = tag.IsSelfClosing;
yield return(newTag);
}
else
{
yield return(node);
}
if (state == MinifyState.LastCharWasSpace &&
settings.InlineElements.Contains(node.Value))
{
if (HtmlTextWriter.VoidElements.Contains(node.Value))
{
state = MinifyState.Compressed;
}
else
{
state = MinifyState.InlineStartAfterSpace;
}
}
}
else
{
yield return(node);
if (state == MinifyState.InlineStartAfterSpace)
{
state = MinifyState.Compressed;
}
}
if (node.Type == HtmlTokenType.StartTag && settings.PreserveInnerSpaceTags.Contains(node.Value))
{
tagState = ContainingTag.WhitespacePreserve;
}
else if (tag?.Value == "script")
{
var type = tag["type"];
if (string.IsNullOrEmpty(type))
{
type = "application/javascript";
}
if (settings.ScriptTypesToCompress.Contains(type))
{
tagState = ContainingTag.Script;
}
else
{
tagState = ContainingTag.WhitespacePreserve;
}
}
else if (node.Type == HtmlTokenType.EndTag &&
(settings.PreserveInnerSpaceTags.Contains(node.Value) || node.Value == "script"))
{
tagState = ContainingTag.None;
}
}
}
}
public static string Minify(TextSource js)
{
var min = new JSMin();
return(min.Minify(js));
}
