public override BlockState TryOpen(BlockProcessor processor)
{
if (processor.IsCodeIndent)
{
return(BlockState.None);
}
// Sample: [!code-javascript[Main](../jquery.js?name=testsnippet#tag "title")]
var slice = processor.Line;
if (!ExtensionsHelper.MatchStart(ref slice, StartString, false))
{
return(BlockState.None);
}
var codeSnippet = new CodeSnippet(this);
MatchLanguage(processor, ref slice, ref codeSnippet);
if (!MatchName(processor, ref slice, ref codeSnippet))
{
return(BlockState.None);
}
if (!MatchPath(processor, ref slice, ref codeSnippet))
{
return(BlockState.None);
}
MatchQuery(processor, ref slice, ref codeSnippet);
MatchTitle(processor, ref slice, ref codeSnippet);
ExtensionsHelper.SkipWhitespace(ref slice);
if (slice.CurrentChar == ')')
{
slice.NextChar();
ExtensionsHelper.SkipWhitespace(ref slice);
if (slice.CurrentChar == ']')
{
var codeSnippetEnd = slice.Start;
slice.NextChar();
ExtensionsHelper.SkipWhitespace(ref slice);
if (slice.CurrentChar == '\0')
{
// slice finished its task, re-use it for Raw content
slice.Start = processor.Line.Start;
slice.End = codeSnippetEnd;
codeSnippet.Raw = slice.ToString();
codeSnippet.Column = processor.Column;
codeSnippet.SetAttributeString();
processor.NewBlocks.Push(codeSnippet);
return(BlockState.BreakDiscard);
}
}
}
return(BlockState.None);
}
private bool MatchTitle(BlockProcessor processor, ref StringSlice slice, ref CodeSnippet codeSnippet)
{
if (slice.CurrentChar != '"')
{
return(false);
}
var title = StringBuilderCache.Local();
var c = slice.NextChar();
var hasEscape = false;
while (c != '\0' && (c != '"' || hasEscape))
{
if (c == '\\' && !hasEscape)
{
hasEscape = true;
}
else
{
title.Append(c);
hasEscape = false;
}
c = slice.NextChar();
}
codeSnippet.Title = title.ToString().Trim();
if (c == '"')
{
slice.NextChar();
return(true);
}
return(false);
}
private bool MatchQuery(BlockProcessor processor, ref StringSlice slice, ref CodeSnippet codeSnippet)
{
var questionMarkMatched = MatchQuestionMarkQuery(processor, ref slice, ref codeSnippet);
var bookMarkMatched = MatchBookMarkQuery(processor, ref slice, ref codeSnippet);
return(questionMarkMatched || bookMarkMatched);
}
private bool MatchLanguage(BlockProcessor processor, ref StringSlice slice, ref CodeSnippet codeSnippet)
{
if (slice.CurrentChar != '-')
{
return(false);
}
var language = StringBuilderCache.Local();
var c = slice.NextChar();
while (c != '\0' && c != '[')
{
language.Append(c);
c = slice.NextChar();
}
codeSnippet.Language = language.ToString().Trim();
return(true);
}
private bool MatchPath(BlockProcessor processor, ref StringSlice slice, ref CodeSnippet codeSnippet)
{
ExtensionsHelper.SkipWhitespace(ref slice);
if (slice.CurrentChar != '(')
{
return(false);
}
var c = slice.NextChar();
var bracketNeedToMatch = 0;
var path = StringBuilderCache.Local();
var hasEscape = false;
while (c != '\0' && (hasEscape || (c != '#' && c != '?' && c != '"' && (c != ')' || bracketNeedToMatch > 0))))
{
if (c == '\\' && !hasEscape)
{
hasEscape = true;
}
else
{
if (c == '(' && !hasEscape)
{
bracketNeedToMatch++;
}
if (c == ')' && !hasEscape)
{
bracketNeedToMatch--;
}
path.Append(c);
hasEscape = false;
}
c = slice.NextChar();
}
codeSnippet.CodePath = path.ToString().Trim();
return(true);
}
private bool TryParseQuery(string queryString, ref CodeSnippet codeSnippet)
{
if (string.IsNullOrEmpty(queryString))
{
return(false);
}
var splitQueryItems = queryString.Split(new[] { '&' });
int start = -1, end = -1;
foreach (var queryItem in splitQueryItems)
{
var keyValueSplit = queryItem.Split(new[] { '=' });
if (keyValueSplit.Length != 2)
{
return(false);
}
var key = keyValueSplit[0];
var value = keyValueSplit[1];
List <CodeRange> temp;
switch (key.ToLower())
{
case "name":
codeSnippet.TagName = value;
break;
case "start":
if (!int.TryParse(value, out start))
{
return(false);
}
end = start;
break;
case "end":
if (!int.TryParse(value, out end))
{
return(false);
}
break;
case "range":
if (!TryGetLineRanges(value, out temp))
{
return(false);
}
codeSnippet.CodeRanges = temp;
break;
case "highlight":
if (!TryGetLineRanges(value, out temp))
{
return(false);
}
codeSnippet.HighlightRanges = temp;
break;
case "dedent":
int dedent;
if (!int.TryParse(value, out dedent))
{
return(false);
}
codeSnippet.DedentLength = dedent;
break;
default:
return(false);
}
}
if (start != -1 && end != -1)
{
codeSnippet.StartEndRange = new CodeRange {
Start = start, End = end
};
}
return(true);
}
private bool MatchBookMarkQuery(BlockProcessor processor, ref StringSlice slice, ref CodeSnippet codeSnippet)
{
if (slice.CurrentChar != '#')
{
return(false);
}
var queryChar = slice.CurrentChar;
var query = StringBuilderCache.Local();
var c = slice.NextChar();
while (c != '\0' && c != '"' && c != ')')
{
query.Append(c);
c = slice.NextChar();
}
var queryString = query.ToString().Trim();
CodeRange codeRange;
if (TryGetLineRange(queryString, out codeRange))
{
codeSnippet.BookMarkRange = codeRange;
}
else
{
codeSnippet.TagName = queryString;
}
return(true);
}
private bool MatchQuestionMarkQuery(BlockProcessor processor, ref StringSlice slice, ref CodeSnippet codeSnippet)
{
if (slice.CurrentChar != '?')
{
return(false);
}
var queryChar = slice.CurrentChar;
var query = StringBuilderCache.Local();
var c = slice.NextChar();
while (c != '\0' && c != '"' && c != ')' && c != '#')
{
query.Append(c);
c = slice.NextChar();
}
var queryString = query.ToString().Trim();
return(TryParseQuery(queryString, ref codeSnippet));
}