I'm trying to generate the parse tree for Antlr4 Python3.g4 grammar file, to parse python3 code Question: I’m using ANTLR4 and trying to generate a parse tree for a python file I have. I used the grammar file python3.g4 from the ANTLR4 documentation. I have the antlr4-python3-runtime installed, and I have ran this command: antlr4 …
How do I add operator precedence to a lark grammar for FOL with Equality? Question: How do I modify this grammar so it matches parenthesis that are further away? ?wff: compound_wff ?compound_wff: biconditional_wff ?biconditional_wff: conditional_wff (SPACE? BICONDITIONAL_SYMBOL SPACE? biconditional_wff)* ?conditional_wff: disjunctive_wff (SPACE? CONDITIONAL_SYMBOL SPACE? conditional_wff)* ?disjunctive_wff: conjunctive_wff (SPACE? DISJUNCTION_SYMBOL SPACE? disjunctive_wff)* ?conjunctive_wff: negated_wff (SPACE? CONJUNCTION_SYMBOL …
How to write in python a parser for a character-based protocol Question: I’m implementing a client for an already existing (old) standard for exchanging information between shops and providers of some specific sector, let’s say vegetables. It must be in python, and I want my package to read a plaintext file and build some objects …
Why isn't this a syntax error in python? Question: Noticed a line in our codebase today which I thought surely would have failed the build with syntax error, but tests were passing so apparently it was actually valid python (in both 2.x and 3). Whitespace is sometimes not required in the conditional expression: >>> 1if …
How to check whether a sentence is correct (simple grammar check in Python)? Question: How to check whether a sentence is valid in Python? Examples: I love Stackoverflow – Correct I Stackoverflow love – Incorrect Asked By: ChamingaD || Source Answers: Check out NLTK. They have support for grammars that you can use to parse …
Combining a Tokenizer into a Grammar and Parser with NLTK Question: I am making my way through the NLTK book and I can’t seem to do something that would appear to be a natural first step for building a decent grammar. My goal is to build a grammar for a particular text corpus. (Initial question: …
