It seems that the function definition cannot be recognized when parsing PHP.

[EmptyDreams]

My code:

import com.bonbonwork.code.core.antlr.PhpLexer
import com.bonbonwork.code.core.antlr.PhpParser
import com.bonbonwork.code.core.antlr.PhpParserBaseListener
import org.antlr.v4.runtime.CharStreams
import org.antlr.v4.runtime.CommonTokenStream

fun main() {
    val lexer = PhpLexer(CharStreams.fromString("""
        <?php
        echo "hello world";
        class A {
            public function _invoke() {
                
            }
        }
    """.trimIndent()))
    val tokens = CommonTokenStream(lexer)
    val parser = PhpParser(tokens)
    parser.addParseListener(TestVisitor())
    println(parser.phpBlock().toStringTree(parser))

}

class TestVisitor : PhpParserBaseListener() {

    override fun enterFunctionDeclaration(ctx: PhpParser.FunctionDeclarationContext) {
        println('a')
    }

}

After executing the code, enterFunctionDeclaration is not triggered, but the class enter and exit events are triggered normally. Additionally, if I call a function within the _invoke function, enterFunctionCall is also triggered.

The final output of the code is:

(phpBlock (topStatement (statement (echoStatement echo (expressionList (expression (string " (interpolatedStringPart hello world) "))) ;))) (topStatement (classDeclaration (classEntryType class) (identifier A) { (classStatement (memberModifiers (memberModifier public)) function (identifier _invoke) ( formalParameterList ) (methodBody (blockStatement { innerStatementList }))) })))

My g4 is: https://github.com/antlr/grammars-v4/tree/master/php

[kaby76]

The input to the parser defines a class with a method, not a function. Try:

<?php
function foo() {
}

$ trparse in | trtree -a
CSharp 0 in success 0.0405193
(htmlDocument (phpBlock (topStatement (functionDeclaration (Function_ "function") (identifier (Label "foo")) (OpenRoundBracket "(") (formalParameterList) (CloseRoundBracket ")") (blockStatement (OpenCurlyBracket "{") (innerStatementList) (CloseCurlyBracket "}"))))) (EOF ""))

[EmptyDreams]

The input to the parser defines a class with a method, not a function.

Okay, I understand. The G4 distinguishes between member function and top-level function definitions during parsing, but it does not differentiate between their calls. Thank you very much for your help!