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Questions - grammar

How many BNF-like grammar specifications does Python have?

There are at least 3 grammar-like specifications within the Python 3.9.1 reference documents 'library-3.9.1.pdf' and 'reference-3.9.1.pdf' (aka https://docs.python.org/3.9/library/ast.html and https:/...
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berniethejet

python

grammar

abstract-syntax-tree

bnf

code-documentation

Votes: 0

Answers: 1

Latest Answer

The grammar used to build Python isn't on your list at all. You can find it in the source bundle as Grammar/python.gram. Note that it has five different start symbols for different compilation context...
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rici

LALR Grammar desambiguation for function calls statements (as in Python grammar)

I'm trying to write a simple LALR parser for a custom DSL. My grammar looks like this : main : stmts stmts : expr stmts | expr : arithmetics | function_call | VARNAME | INT ari...
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ibi0tux

python

parsing

grammar

lalr

Votes: 0

Answers: 0

The exponential operator in Matlab grammar using ANTLR4 does not work correctly

I have been using matlab grammar from this source. I came across an error to the following input a = 2^2*3 b = 3*2^2 Result in both cases should be 12, but it is not, because the exponential operator...
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modryslon

matlab

antlr4

grammar

operator-keyword

exponential

Votes: 0

Answers: 1

Latest Answer

I think you need to replace the section multiplicative_expression with the following: multiplicative_expression : pow_expression | multiplicative_expression '*' pow_expression | multiplicativ...
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Sam Roberts

Is there a way to run an action on a grammar that's already been parsed?

If I do: my $parsed_grammar = PG.parse( $some_string ); Is there any way to to do something like the pseudo code below? $parsed_grammar.run_action( $action_class.new );
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StevieD

grammar

raku

Votes: 0

Answers: 1

Latest Answer

No. Your grammar is basically a program. Contrary to other (regex) implementations, Raku grammars are basically just another way to write a class and methods. It's all code underneath. Code that can...
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Elizabeth Mattijsen

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