Comments (2)
This is actually expected behavior! You've found a very interesting corner-case where there are an infinite number of possible parsings of the empty string:
""
= null
= .:* (null) .:*
= .:* (.:* (null) .:*) .:*
= …
where each .:*
matches zero .
's. Nearley tries to give you all of these parsings, so it goes into an infinite loop.
Depending on what you're trying to do, there are different ways to fix this grammar so that it isn't ambiguous. Let me know if you need any help.
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Oh, that's cool! Thank you for explaining :)
The original reason for this behavior was a typo - a -> .:* a .:*
should have been b -> .:* a .:*
, so it's no longer infinitely ambiguous :).
Thanks for a cool project!
from nearley.
Related Issues (20)
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- Automatic conversion to textmate grammar HOT 1
- Can't undertsand indentifier token HOT 1
- Understanding ambiguity: possible bug with "-" character?
- How to match end of input? HOT 1
- Removing ambiquity by enforcing precedence order HOT 6
- State of discarding tokenizers is sometimes not saved
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- The streaming implementation does not take in account that a token may be split across two chunks HOT 4
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- Wrong input lines on error HOT 4
- Use nearley parser at front end, how to reset parser for new input HOT 1
- Parsing the text failed, and the error message said that an opening bracket is required, but I already have an opening bracket. HOT 1
- Docs improvement: what do the colons mean? ":" HOT 2
- An example showing significant whitespace? HOT 3
- Recursive macros does not work HOT 1
- Output is just a nested array of characters HOT 1
- facing an error while parsing in case of newline token HOT 1
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from nearley.