Comments (2)
renggli
commented on August 10, 2024
The thing with exceptions might be possible, but a bit tricky to avoid performance problems in the common case.
In the meantime have a look at my last commit:
var xml = Transformations.debug(new JsonParser());
xml.parse('{"a": 1}');
The debug transformation changes the parser to emit the intermediate state with each parser activation/success/failure. This is probably even more useful than a traditional stack trace.
Instance of 'JsonParser'
Instance of '_EndOfInputParser@0x37ace08b'
Instance of '_ChoiceParser@0x37ace08b'
Instance of '_TrimmingParser@0x37ace08b'
Instance of '_WhitespaceParser@0x37ace08b'
Failure[1:1]: whitespace expected
Instance of '_ActionParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_CharParser@0x37ace08b'
Failure[1:1]: " expected
Failure[1:1]: " expected
Failure[1:1]: " expected
Failure[1:1]: " expected
Instance of '_ActionParser@0x37ace08b'
Instance of '_TrimmingParser@0x37ace08b'
Instance of '_WhitespaceParser@0x37ace08b'
Failure[1:1]: whitespace expected
Instance of '_FlattenParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_OptionalParser@0x37ace08b'
Instance of '_CharParser@0x37ace08b'
Failure[1:1]: - expected
Success[1:1]: null
Instance of '_ChoiceParser@0x37ace08b'
Instance of '_CharParser@0x37ace08b'
Failure[1:1]: 0 expected
Instance of '_RepeatingParser@0x37ace08b'
Instance of '_DigitParser@0x37ace08b'
Failure[1:1]: digit expected
Failure[1:1]: digit expected
Failure[1:1]: digit expected
Failure[1:1]: digit expected
Failure[1:1]: digit expected
Failure[1:1]: digit expected
Failure[1:1]: digit expected
Instance of '_ActionParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_TrimmingParser@0x37ace08b'
Instance of '_WhitespaceParser@0x37ace08b'
Failure[1:1]: whitespace expected
Instance of '_CharParser@0x37ace08b'
Success[1:2]: {
Instance of '_WhitespaceParser@0x37ace08b'
Failure[1:2]: whitespace expected
Success[1:2]: {
Instance of '_OptionalParser@0x37ace08b'
Instance of '_ActionParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_TrimmingParser@0x37ace08b'
Instance of '_WhitespaceParser@0x37ace08b'
Failure[1:2]: whitespace expected
Instance of '_ActionParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_CharParser@0x37ace08b'
Success[1:3]: "
Instance of '_RepeatingParser@0x37ace08b'
Instance of '_ChoiceParser@0x37ace08b'
Instance of '_ActionParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_CharParser@0x37ace08b'
Failure[1:3]: \ expected
Failure[1:3]: \ expected
Failure[1:3]: \ expected
Instance of '_ActionParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_PredicateParser@0x37ace08b'
Failure[1:3]: \u expected
Failure[1:3]: \u expected
Failure[1:3]: \u expected
Instance of '_ActionParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_NotParser@0x37ace08b'
Instance of '_PredicateParser@0x37ace08b'
Failure[1:3]: any of "\ expected
Success[1:3]: null
Instance of '_PredicateParser@0x37ace08b'
Success[1:4]: a
Success[1:4]: [null, a]
Success[1:4]: a
Success[1:4]: a
Instance of '_ChoiceParser@0x37ace08b'
Instance of '_ActionParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_CharParser@0x37ace08b'
Failure[1:4]: \ expected
Failure[1:4]: \ expected
Failure[1:4]: \ expected
Instance of '_ActionParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_PredicateParser@0x37ace08b'
Failure[1:4]: \u expected
Failure[1:4]: \u expected
Failure[1:4]: \u expected
Instance of '_ActionParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_NotParser@0x37ace08b'
Instance of '_PredicateParser@0x37ace08b'
Success[1:5]: "
Failure[1:4]: null
Failure[1:4]: null
Failure[1:4]: null
Failure[1:4]: null
Success[1:4]: [a]
Instance of '_CharParser@0x37ace08b'
Success[1:5]: "
Success[1:5]: [", [a], "]
Success[1:5]: a
Instance of '_WhitespaceParser@0x37ace08b'
Failure[1:5]: whitespace expected
Success[1:5]: a
Instance of '_TrimmingParser@0x37ace08b'
Instance of '_WhitespaceParser@0x37ace08b'
Failure[1:5]: whitespace expected
Instance of '_CharParser@0x37ace08b'
Success[1:6]: :
Instance of '_WhitespaceParser@0x37ace08b'
Success[1:7]:
Instance of '_WhitespaceParser@0x37ace08b'
Failure[1:7]: whitespace expected
Success[1:7]: :
Instance of '_ChoiceParser@0x37ace08b'
Instance of '_TrimmingParser@0x37ace08b'
Instance of '_WhitespaceParser@0x37ace08b'
Failure[1:7]: whitespace expected
Instance of '_ActionParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_CharParser@0x37ace08b'
Failure[1:7]: " expected
Failure[1:7]: " expected
Failure[1:7]: " expected
Failure[1:7]: " expected
Instance of '_ActionParser@0x37ace08b'
Instance of '_TrimmingParser@0x37ace08b'
Instance of '_WhitespaceParser@0x37ace08b'
Failure[1:7]: whitespace expected
Instance of '_FlattenParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_OptionalParser@0x37ace08b'
Instance of '_CharParser@0x37ace08b'
Failure[1:7]: - expected
Success[1:7]: null
Instance of '_ChoiceParser@0x37ace08b'
Instance of '_CharParser@0x37ace08b'
Failure[1:7]: 0 expected
Instance of '_RepeatingParser@0x37ace08b'
Instance of '_DigitParser@0x37ace08b'
Success[1:8]: 1
Instance of '_DigitParser@0x37ace08b'
Failure[1:8]: digit expected
Success[1:8]: [1]
Success[1:8]: [1]
Instance of '_OptionalParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_CharParser@0x37ace08b'
Failure[1:8]: . expected
Failure[1:8]: . expected
Success[1:8]: null
Instance of '_OptionalParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_PredicateParser@0x37ace08b'
Failure[1:8]: any of eE expected
Failure[1:8]: any of eE expected
Success[1:8]: null
Success[1:8]: [null, [1], null, null]
Success[1:8]: 1
Instance of '_WhitespaceParser@0x37ace08b'
Failure[1:8]: whitespace expected
Success[1:8]: 1
Success[1:8]: 1
Success[1:8]: 1
Success[1:8]: [a, :, 1]
Instance of '_RepeatingParser@0x37ace08b'
Instance of '_SequenceParser@0x37ace08b'
Instance of '_TrimmingParser@0x37ace08b'
Instance of '_WhitespaceParser@0x37ace08b'
Failure[1:8]: whitespace expected
Instance of '_CharParser@0x37ace08b'
Failure[1:8]: , expected
Failure[1:8]: , expected
Failure[1:8]: , expected
Success[1:8]: []
Success[1:8]: [[a, :, 1], []]
Success[1:8]: [[a, :, 1]]
Success[1:8]: [[a, :, 1]]
Instance of '_TrimmingParser@0x37ace08b'
Instance of '_WhitespaceParser@0x37ace08b'
Failure[1:8]: whitespace expected
Instance of '_CharParser@0x37ace08b'
Success[1:9]: }
Instance of '_WhitespaceParser@0x37ace08b'
Failure[1:9]: whitespace expected
Success[1:9]: }
Success[1:9]: [{, [[a, :, 1]], }]
Success[1:9]: {a: 1}
Success[1:9]: {a: 1}
Success[1:9]: {a: 1}
Success[1:9]: {a: 1}
Let me know what you think?
from dart-petitparser.
kevmoo
commented on August 10, 2024
Oooo...nice.
I'll have to try it out next time I'm debugging something.
This does seem better that just a stack trace, but I'll have see.
Thanks!
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