Errors when generating sourcemaps

[BaliBalo]

Some Invalid mapping errors appear when using values with parentheses (e.g. calc(thing))

This seems to be due to 28c39db, where the parser uses last[3] to get the end position here, but the tokenizer only outputs 3 values in the case of a parenthesis here and here. This causes undefined to be sent to input.fromOffset, returning a NaN column value.

This should be fixable by using offset + 1 as the fourth value, like for the other single-character tokens above. Created PR #111

[ai]

Thanks for the fix. It was released in 5.0.1.