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Problem when using listener mode

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
python, typescript
Domain
compilers

Research direction

Reproduce the two examples with Python3Parser.parse and parser.listen, comparing input with and without the trailing newline. Start at the parser and listener behavior around the final import statement, then verify that listener callbacks work for code without a trailing line break while preserving the existing multiline behavior.

Written by the indexing model from the issue text.

Description

When using listener mode the parser is always expecting a line break after each line of python code.
For instance,

const parser = new Python3Parser();
const python ='import sys\nfor i in sys.argv:\n print(i)';
// parseTree
const tree = parser.parse(python);
class MyListener extends Python3Listener {
    enterImport_name(ctx): void {
        let importName = ctx
            .getText()
            .toLowerCase()
            .match(/(?<=import).+/)?.[0];
        console.log('ImportName', importName);
    }
}
const listenTableName = new MyListener();
parser.listen(listenTableName, tree);

The above code will work but when I remove '\n' from the python code it won't (Given below).

const parser = new Python3Parser();
const python ='import sys';
// parseTree
const tree = parser.parse(python);
class MyListener extends Python3Listener {
    enterImport_name(ctx): void {
        let importName = ctx
            .getText()
            .toLowerCase()
            .match(/(?<=import).+/)?.[0];
        console.log('ImportName', importName);
    }
}
const listenTableName = new MyListener();
parser.listen(listenTableName, tree);

Is there a work around for this? I want to dynamically pass the python code to the parser so it might not always have a line break.

Dominant language
JavaScript
Stars
25
Forks
7
No merged PRs in 30d

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