/// <summary>
/// Minifies CSS code
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public static string MinifyCss(string data)
{
var blocks = new List <string>();
while (data.Length > 0)
{
var block = data.Length > Minifier.BlockSize ? data.Substring(0, Minifier.BlockSize) : data;
data = data.Remove(0, block.Length);
if (data.Length > 0)
{
while (block.Last() != '}' && data.Length > 0)
{
block += data.First();
data = data.Remove(0, 1);
}
}
blocks.Add(block);
}
return(blocks.Select(block => Minifier.MinifyCss(block.ToBytes(Encoding.UTF8))).Join(""));
}
/// <summary>
/// Minifies Javascript code
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
public static string MinifyJs(Stream stream)
{
var lastChar = 1;
var isEOF = false;
var isInComment = false;
var isInStringVariable = false;
var isInLiterialString = false;
var isInLiterialExpression = false;
var isDoubleSlashComment = false;
var decoder = Encoding.UTF8.GetDecoder();
var buffer = new char[1];
var minified = "";
using (var reader = new BinaryReader(stream, Encoding.UTF8))
while (!isEOF)
{
var nextChar = reader.PeekChar();
isEOF = nextChar.IsEOF();
if (isEOF)
{
break;
}
var isIgnore = false;
var thisChar = (int)reader.ReadByte();
if (thisChar == '\t')
{
thisChar = ' ';
}
else if (thisChar == '\t' || thisChar == '\r')
{
thisChar = '\n';
}
if (thisChar == '\n')
{
isIgnore = true;
}
else if (thisChar == ' ' && !isInStringVariable && (!isInLiterialString || isInLiterialExpression))
{
if (lastChar == ' ' || lastChar == '>' || lastChar == '<' || Minifier.IsDelimiter(lastChar))
{
isIgnore = true;
}
else
{
nextChar = reader.PeekChar();
isEOF = nextChar.IsEOF();
if (!isEOF)
{
isIgnore = nextChar == '>' || nextChar == '<' || nextChar == '}' || nextChar == ')' || Minifier.IsDelimiter(nextChar);
}
}
}
else if (thisChar == '/')
{
nextChar = reader.PeekChar();
if (nextChar == '*')
{
isInComment = isIgnore = true;
isDoubleSlashComment = false;
}
else if (nextChar == '/')
{
isInComment = lastChar != ':' && lastChar != '"' && lastChar != '\'' && lastChar != '\\';
isIgnore = isInComment;
isDoubleSlashComment = isInComment && nextChar == '/';
}
}
// ignore all characters till we reach end of comment
if (isInComment)
{
isInLiterialString = isInLiterialExpression = isInStringVariable = false;
isIgnore = true;
while (true)
{
thisChar = reader.ReadByte();
if (thisChar == '*')
{
nextChar = reader.PeekChar();
if (nextChar == '/')
{
thisChar = reader.ReadByte();
isInComment = false;
break;
}
}
if (isDoubleSlashComment && thisChar == '\n')
{
isInComment = false;
break;
}
}
}
// special characters (string)
else if (!isIgnore)
{
if (thisChar == '`')
{
isInLiterialString = !isInLiterialString;
isInLiterialExpression = isInStringVariable = false;
}
else if (thisChar == '{' && lastChar == '$' && isInLiterialString)
{
isInLiterialExpression = true;
isInStringVariable = false;
}
else if (thisChar == '}' && isInLiterialString && isInLiterialExpression)
{
isInLiterialExpression = isInStringVariable = false;
}
else if ((thisChar == '\'' || thisChar == '"') && lastChar != '\\')
{
isInStringVariable = isInLiterialString
? isInLiterialExpression && !isInStringVariable
: !isInStringVariable;
}
}
if (!isIgnore)
{
minified += decoder.GetChars(new[] { (byte)thisChar }, 0, 1, buffer, 0) > 0 ? $"{buffer[0]}" : "";
}
lastChar = thisChar;
}
return(minified.Replace("; }", ";}"));
}
/// <summary> /// Minifies CSS code /// </summary> /// <param name="data"></param> /// <returns></returns> public static string MinifyCss(byte[] data) => Minifier.MinifyCss(data.ToMemoryStream());
/// <summary>
/// Minifies CSS code
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
public static string MinifyCss(Stream stream)
{
var lastChar = 1;
var isEOF = false;
var isInComment = false;
var isDoubleSlashComment = false;
var decoder = Encoding.UTF8.GetDecoder();
var buffer = new char[1];
var minified = "";
using (var reader = new BinaryReader(stream, Encoding.UTF8))
while (!isEOF)
{
var nextChar = reader.PeekChar();
isEOF = nextChar.IsEOF();
if (isEOF)
{
break;
}
var isIgnore = false;
int thisChar = reader.ReadByte();
if (thisChar == '\t')
{
thisChar = ' ';
}
else if (thisChar == '\t' || thisChar == '\r')
{
thisChar = '\n';
}
if (thisChar == '\n')
{
isIgnore = true;
}
else if (thisChar == ' ')
{
if (lastChar == '-')
{
isIgnore = false;
}
else if (lastChar == ' ' || lastChar == '>' || lastChar == '}' || Minifier.IsDelimiter(lastChar))
{
isIgnore = true;
}
else
{
nextChar = reader.PeekChar();
isEOF = nextChar.IsEOF();
if (!isEOF)
{
isIgnore = nextChar != '-' && nextChar != '[' && (nextChar == '>' || Minifier.IsDelimiter(nextChar));
}
}
}
else if (thisChar == '/')
{
nextChar = reader.PeekChar();
if (nextChar == '*')
{
isInComment = isIgnore = true;
isDoubleSlashComment = false;
}
else if (nextChar == '/')
{
isInComment = lastChar != ':';
isIgnore = isInComment;
isDoubleSlashComment = isInComment && nextChar == '/';
}
}
// ignore all characters till we reach end of comment
if (isInComment)
{
isIgnore = true;
while (true)
{
thisChar = reader.ReadByte();
if (thisChar == '*')
{
nextChar = reader.PeekChar();
if (nextChar == '/')
{
thisChar = reader.ReadByte();
isInComment = false;
break;
}
}
if (isDoubleSlashComment && thisChar == '\n')
{
isInComment = false;
break;
}
}
}
// update the valid data
if (!isIgnore)
{
minified += decoder.GetChars(new[] { (byte)thisChar }, 0, 1, buffer, 0) > 0 ? $"{buffer[0]}" : "";
}
lastChar = thisChar;
}
return(minified.Replace("; }", ";}"));
}
