- Notifications
You must be signed in to change notification settings - Fork131
Open
Description
implicitdefliteral(s:String):Parser[String]=newParser[String] {defapply(in:Input)= {valsource= in.sourcevaloffset= in.offsetvalstart= handleWhiteSpace(source, offset)vari=0varj= startwhile (i< s.length&& j< source.length&& s.charAt(i)== source.charAt(j)) { i+=1 j+=1 }if (i== s.length)Success(source.subSequence(start, j).toString, in.drop(j- offset),None)else {valfound=if (start== source.length())"end of source"else"'"+source.charAt(start)+"'"Failure("'"+s+"' expected but"+found+" found", in.drop(start- offset)) } }}
Note the error reporting at the end where the index of the mismatch is reported asstart. If the string is"apple", and the input"...apply...", the mismatch is at the character'y', which is pointed to by the variablej, not at the character'a', which is pointed to bystart.
println(parse("apple","apply"))
Failure('apple' expected but 'a' found,CharSequenceReader('a', ...))
A potential fix may be as follows:
valrest= in.drop(start- offset)if (start== source.length())Failure(s"'$s' expected but end of source found", rest)elseFailure(s"'$s' expected but '${source.charAt(j)}' found at index$j", rest)
Metadata
Metadata
Assignees
Labels
No labels