Questions about the Lark parser project
Use this tag when asking questions about the Lark parser project (https://github.com/lark-parser/lark)
Questions tagged [lark-parser]
97 questions
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Resolve ambiguity between strings and numbers in lark
I'm writing a grammar for a YAML-like serialization format. I'm using a LALR parser. I've hit a roadblock when parsing scalars. A scalar can be a string or a number (let's keep it simple and make it only decimals or floats). Here's what I have so…
d34n
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How to optimze grammar for Lark parser
My goal is to create a parser which can be used to parse DBC files.
The syntax of the fileformat is given here.
To achive this I choose the Lark-parser based on the excellent JSON parser tutorial.
I created a grammar file based on the above linked…
handras
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UnexpectedCharacters Error when parsing for roman numeral using lark parser (ebnf grammar)
i'm using the follow grammar in lark-parser to parse alphabets and roman numerals. The grammar is as follows:
DIGIT: "0".."9"
INT: DIGIT+
_L_PAREN: "("
_R_PAREN: ")"
LCASE_LETTER: "a".."z"
ROMAN_NUMERALS: "viii" | "vii" | "iii" | "ii" | "ix" | "vi"…
snowflake
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Getting shift-reduce conflict while parsing grammar
I am using LALR(1) parsing from lark-parser library. I have written a grammar to parse an ORM like language. An example of my language is pasted below:
Table1
.join(table=Table2, left_on=[column1], right_on=[column_2])
.group_by(col=[column1],…
Prashant
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- 3
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Cannot get values from Lark AST
I cannot and do not know how to retrieve the values of an AST that I generated using the Lark parser.
My grammar is as follows, saved in a .lark file :
start: (un_handle ": ")? AMOUNT "|" p_handle ("," p_handle)* (" \"" MESSAGE* "\"")?
AMOUNT:…
Willy
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How to feed lark with an antlr g4 C# grammar?
I would like to use lark to generate a parser for C# 6.
I found a C# 6 antlr grammar but it does not work out-of-the-box with lark.
Is there anybody who could tell me how to reformat the g4 grammar to something I can feed lark with?
It seems that…
Natalie Perret
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Python - Lark - Grammar - Can not generate AST
i am currently trying to generate an abstract syntax tree from a functional expression, which could be for example:
OR(FunctionOne("valueA", "valueB", "valueC"), FunctionTwo("valueD", "valueE", "valueF"))
Basically a simple concatenation of…
Creative crypter
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