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Questions - abstract-syntax-tree

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

ANTLR4: Re-visiting parse rules after the whole ast is visited

I am currently implementing generic functions for my own language, but I got stuck and currently have the following problem: Generic functions can get called from another source file (another parser i...
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ChilliBits

c++

parsing

antlr

antlr4

abstract-syntax-tree

Votes: 0

Answers: 2

Latest Answer

You're going to be interested by this blog post https://devblogs.microsoft.com/cppblog/two-phase-name-lookup-support-comes-to-msvc/ What you're trying to do necessitates you to make a decision about y...
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v.oddou

Python string eval failing on empty items in list

import ast s = "[0,1,,,2]" d = ast.literal_eval(s) I have a string with blank items in a list that I need convert to a list. Is there any library that can handle lists like this? The ac...
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asdad23

python

python-3.x

list

eval

abstract-syntax-tree

Votes: 0

Answers: 1

Latest Answer

empty blanks ",," is not a valid json string or python. your best bet is to covert this into a valid json ",null," or python ",None," and then try to evaluate it. def rep...
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Saf Rahman

How are these parse tree generated?

I need assistance regarding generating the parse tree and the syntax tree. My version of the solutions are the images below but I don't know if they are correct or way off. Given the Grammar: S-->a...
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zed unseened

compiler-construction

abstract-syntax-tree

context-free-grammar

parse-tree

Votes: 0

Answers: 1

Latest Answer

A parse tree (or a syntax tree) needs to correspond to the grammar. The easiest way to construct one is directly from the grammar, since this is exactly what your parser will do. Get out a nice big sh...
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rici

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