public TokenRange GetMatchingRangeIn(TokenRange range)
{
Func <Token, bool> pred;
int dir;
switch (Value)
{
case "(": pred = t => t.Value != ")" || t.ParenDepth != ParenDepth; dir = +1; break;
case ")": pred = t => t.Value != "(" || t.ParenDepth != ParenDepth; dir = -1; break;
case "{": pred = t => t.Value != "}" || t.BraceDepth != BraceDepth; dir = +1; break;
case "}": pred = t => t.Value != "{" || t.BraceDepth != BraceDepth; dir = -1; break;
case "<": return
(new TokenRange(range.GetAllTokens(),
Position + 1,
AngleBracketParser.NotInsideAngleBrackets(
new TokenRange(range.GetAllTokens(), Position, range.End))
.Skip(1) // skip the "<", which is considered "outside"
.First() // get the ">", which is likewise "outside"
.Position));
default: throw new NotSupportedException("Can't match this token!");
}
TokenRange r;
if (dir == -1)
{
r = new TokenRange(range.GetAllTokens(), range.Begin, Position)
.RevTakeWhile(pred);
if (r.Begin == range.Begin)
{
throw new Error(SourceLine, "Syntax error: Unmatched " + Value);
}
}
else
{
r = new TokenRange(range.GetAllTokens(), Position + 1, range.End)
.TakeWhile(pred);
if (r.End == range.End)
{
throw new Error(SourceLine, "Syntax error: Unmatched " + Value);
}
}
return(r);
}
