Minify <TResult>(string source,
TResult space, TResult newLine,
MinificationOptions options,
Func <Token, TResult> resultSelector)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (resultSelector == null)
{
throw new ArgumentNullException(nameof(resultSelector));
}
return(_()); IEnumerable <TResult> _()
{
public static IEnumerable <string> Minify(string source, string newLine,
MinificationOptions options) =>
Minify(source, " ", newLine, options, t => t.Substring(source));
public static IEnumerable <string> Minify(string source, MinificationOptions options) => Minify(source, Environment.NewLine, options);
public MinificationOptions OrCommentFilterOf(MinificationOptions other)
=> CommentFilter == other.CommentFilter || CommentFilter != null && other.CommentFilter == null ? this
: CommentFilter == null && other.CommentFilter != null?WithCommentFilter(other.CommentFilter)
: WithCommentFilter((t, s) => CommentFilter(t, s) || other.CommentFilter(t, s));
MinificationOptions(MinificationOptions options) :
this(options.CommentFilter, options.KeepLeadComment)
{
}
Minify <TResult>(string source,
TResult space, TResult newLine,
MinificationOptions options,
Func <Token, TResult> resultSelector)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (resultSelector == null)
{
throw new ArgumentNullException(nameof(resultSelector));
}
return(_()); IEnumerable <TResult> _()
{
bool IsSpaceOrTab(char ch) => ch == ' ' || ch == '\t';
bool IsAsciiLetter(char ch) => (ch = (char)(ch & ~0x20)) >= 'A' && ch <= 'z';
bool IsWordChar(char ch) => char.IsLetter(ch) ||
ch >= '0' && ch <= '9' ||
ch == '_';
var lcs = LeadCommentState.Awaiting;
var lastCh = (char?)null;
var lastSingleLineCommentLine = (int?)null;
TResult NewLineWhileResettingLastChar()
{
lastCh = null;
return(newLine);
}
foreach (var t in Scanner.Scan(source))
{
switch (t.Kind)
{
case TokenKind.NewLine:
case TokenKind.WhiteSpace:
break;
case TokenKind k
when k.HasTraits(TokenKindTraits.Comment) &&
options.KeepLeadComment &&
lcs != LeadCommentState.Processed &&
(lastSingleLineCommentLine is null ||
lastSingleLineCommentLine is int ln &&
t.Start.Line - ln == 1):
{
yield return(resultSelector(t));
if (k == TokenKind.SingleLineComment)
{
lastSingleLineCommentLine = t.Start.Line;
yield return(NewLineWhileResettingLastChar());
lcs = LeadCommentState.Processing;
}
else
{
lcs = LeadCommentState.Processed;
}
break;
}
case TokenKind k
when k.HasTraits(TokenKindTraits.Comment) &&
options.CommentFilter is Func <Token, string, bool> filter &&
filter(t, source):
{
yield return(resultSelector(t));
if (k == TokenKind.SingleLineComment)
{
yield return(NewLineWhileResettingLastChar());
}
break;
}
case TokenKind k when k.HasTraits(TokenKindTraits.Comment):
continue;
default:
{
lcs = LeadCommentState.Processed;
if (t.Kind == TokenKind.PreprocessorDirective)
{
var tei = t.End.Offset;
var si = t.Start.Offset + 1;
while (si < tei && IsSpaceOrTab(source[si]))
{
si++;
}
var ei = si;
while (ei < tei && IsAsciiLetter(source[ei]))
{
ei++;
}
var length = ei - si;
if (length == 0 ||
string.CompareOrdinal("region", 0, source, si, length) != 0 &&
string.CompareOrdinal("endregion", 0, source, si, length) != 0)
{
if (lastCh != null)
{
yield return(newLine);
}
yield return(resultSelector(t));
yield return(NewLineWhileResettingLastChar());
}
}
else
{
if (lastCh is char lch)
{
var ch = source[t.Start.Offset];
if (IsWordChar(ch) && IsWordChar(lch) || ch == lch && (ch == '+' || ch == '-' || ch == '*'))
{
yield return(space);
}
}
yield return(resultSelector(t));
lastCh = source[t.End.Offset - 1];
}
break;
}
}
}
}
}