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| author | Jed Barber <jjbarber@y7mail.com> | 2014-02-13 02:02:11 +1100 |
|---|---|---|
| committer | Jed Barber <jjbarber@y7mail.com> | 2014-02-13 02:02:11 +1100 |
| commit | ab757822c75aa71bd725126d9511fcb678f6e5e3 (patch) | |
| tree | 3e42f31ead0af187cdc88475ad8ead733ddc7671 /Fractran/Parser.hs | |
| parent | 96d6b8ebd32166f5d72420e94060de4792da999b (diff) | |
Added better error messages in parsers
Diffstat (limited to 'Fractran/Parser.hs')
| -rw-r--r-- | Fractran/Parser.hs | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Fractran/Parser.hs b/Fractran/Parser.hs index 6d6cd86..95aa954 100644 --- a/Fractran/Parser.hs +++ b/Fractran/Parser.hs @@ -39,7 +39,8 @@ intPair = do return (numerator,denominator) -slash = char '/' +slash = char '/' + <?> "slash character" initVal = do @@ -59,7 +60,8 @@ positiveNumber = do return (read (firstDigit:rest)) -nonZeroDigit = oneOf "123456789" +nonZeroDigit = oneOf "123456789" + <?> "non-zero digit" whiteSpace = many (oneOf "\t\n\r ") |