public string Minify(string content, MelezeWebMinifierState state)
{
if (state.InsidePre)
{
if (string.IsNullOrEmpty(content))
{
return(string.Empty);
}
}
else
{
if (string.IsNullOrWhiteSpace(content))
{
return(string.Empty);
}
}
var builder = new StringBuilder(content.Length);
content = Comments
? MinifyComments(content, builder, state)
: MinifyHtml(content, builder, state);
return(content);
}
public MelezeWebMinifierState AnalyseContent(string content, MelezeWebMinifierState state)
{
if (string.IsNullOrWhiteSpace(content))
{
return(state);
}
var previousIsWhiteSpace = char.IsWhiteSpace(content[content.Length - 1]);
var previousTokenEndsWithBlockElement = EndsWithBlockElement(content);
var insideScript = IsInsideTag("<script", "</script>", state.InsideScript, content);
var insidePre = IsInsideTag("<pre", "</pre>", state.InsidePre, content);
var insideComment = IsInsideTag("<!--", "-->", state.InsideComment, content);
var preserveComment = insideComment && state.PreserveComment;
return(new MelezeWebMinifierState(previousIsWhiteSpace, previousTokenEndsWithBlockElement,
insidePre, insideScript, insideComment, preserveComment));
}
/// <summary>
/// Removes all the comments that are not Javascript or IE conditional comments.
/// </summary>
/// <param name="content"></param>
/// <param name="builder"></param>
/// <param name="state"></param>
/// <returns></returns>
private string MinifyComments(string content, StringBuilder builder, MelezeWebMinifierState state)
{
ProcessItem("<!--", "-->", content, state.InsideComment,
insideComment =>
{
// There is a comment but it contains javascript or IE conditionals => we keep it
if (CommentsMarkers.Any(insideComment.Contains))
{
state.PreserveComment = true;
}
if (state.PreserveComment)
{
builder.Append(insideComment);
}
},
outsideComment => MinifyHtml(outsideComment, builder, state));
return(builder.ToString());
}
/// <summary>
/// Minify all the white space. Only one space is kept between attributes and words.
/// Whitespace is completly remove arround HTML block elements while only a single
/// one is kept arround inline elements.
/// </summary>
/// <param name="content"></param>
/// <param name="builder"></param>
/// <returns></returns>
private static string MinifyAggressivelyHtml(string content, StringBuilder builder, MelezeWebMinifierState state)
{
bool previousTokenEndsWithBlockElement = state.PreviousTokenEndsWithBlockElement;
bool previousIsWhiteSpace = state.PreviousIsWhiteSpace;
ProcessTag("script", content, state.InsideScript,
jsContent =>
{
previousIsWhiteSpace = MinifySafelyHtmlBlock(jsContent, builder, previousIsWhiteSpace, state.InsidePre);
},
htmlContent => ProcessTag("pre", htmlContent, state.InsidePre,
preContent =>
{
builder.Append(preContent);
},
htmlPreContent =>
{
var tokens = htmlPreContent.Split(WhiteSpaceSeparators, StringSplitOptions.RemoveEmptyEntries);
previousTokenEndsWithBlockElement |= (htmlPreContent.Length > 0) && !char.IsWhiteSpace(htmlPreContent[0]);
previousIsWhiteSpace = false;
for (int i = 0; i < tokens.Length; i++)
{
var token = tokens[i].Trim();
if (string.IsNullOrEmpty(token))
{
continue;
}
if (!previousTokenEndsWithBlockElement && !StartsWithBlockElement(token))
{
// We have to keep a white space between 2 texts or an inline element and a text or between 2 inline elements
builder.Append(' ');
}
builder.Append(token);
previousTokenEndsWithBlockElement = EndsWithBlockElement(tokens, i);
}
if (!previousTokenEndsWithBlockElement && char.IsWhiteSpace(htmlPreContent[htmlPreContent.Length - 1]))
{
builder.Append(' ');
previousIsWhiteSpace = true;
}
}));
content = builder.ToString();
return(content);
}
/// <summary>
/// Minify white space while keeping the HTML compatible with the given one.
/// Blanks between tags on the same line are not minified.
/// Just the line start/end are trimmed (the indentation).
/// </summary>
private static string MinifySafelyHtml(string content, StringBuilder builder, MelezeWebMinifierState state)
{
MinifySafelyHtmlBlock(content, builder, state.PreviousIsWhiteSpace, state.InsidePre);
content = builder.ToString();
return(content);
}
private string MinifyHtml(string content, StringBuilder builder, MelezeWebMinifierState state)
{
return(Aggressive
? MinifyAggressivelyHtml(content, builder, state)
: MinifySafelyHtml(content, builder, state));
}