Swift ANTLR Runtime: Terminals not working / crash when calling ctx.getText()

[vinaykumar0339]

Description

• I am building an expression language using ANTLR 4.13.2.

• It works fine in JavaScript and Java.

• In Swift, I’m encountering an issue when accessing terminals.

Issue

The crash occurs at this method:

// This method is from TerminalNodeImpl.swift file
public func getText() -> String {
    return (symbol.getText())!   // ⚠️ crash here
}

Example input expression:

1+1

And in the visitor:

public override func visitNumberLiteral(_ ctx: JexLangParser.NumberLiteralContext) -> Any? {
    ctx.getText() // ⚠️ crash occurs here
}

• When the visitor tries to access ctx.getText(), the application crashes.

• It seems related to terminals not being recognized properly in runtime Swift Parser.

Notes

• The grammar works in JS and Java, so the issue may be specific to the Swift ANTLR runtime.

• Terminals like NUMBER or + might not be producing valid symbols when parsed in Swift.

In an above Image for three children
0 -> NumberLiteral
1 -> Operator
2 -> NumberLiteral

[vinaykumar0339]

Hi @aphyr, can you help me out here, please?

[aphyr]

I am not a maintainer of Antlr, and I do not appreciate being tagged in to LLM slop issues.