I have been struggling with a particular problem and despite my efforts, I haven't been able to find a solution. Any guidance in the right direction would be greatly appreciated.
My current challenge involves parsing a JavaScript file using ANTLR in Java. I've been utilizing the lexer and parser g4 files from the antlr-github repository:
JavaScriptLexer.g4 JavaScriptParser.g4
Subsequently, I am using JavaScriptListener for the parsing process.
The issue arises when dealing with nested if/else blocks.
For instance, consider the following snippet of JavaScript code:
if (if_1) {
a=b;
if (nested_if_1) {
nested_if_a=nested_if_b;
}
} else if (else_if_1) {
else_if_1_a = else_if_1_b;
}
The dilemma lies in determining which else if block these statements belong to.
How can one identify that the second if is enclosed within the first?
Given that the listener only has two methods related to 'if' statements:
enterIfStatement(JavaScriptParser.IfStatementContext ctx)
exitIfStatement(JavaScriptParser.IfStatementContext ctx)
UPDATE
To provide better clarity, I'm sharing the walker output as follows:
Output of the listener's entry/exit actions for if statements
+enterIfStatement: if(if_1){a=b;if(nested_if_1){nested_if_a=nested_if_b;}}elseif(else_if_1){else_if_1_a=else_if_1_b;}
enterStatement: {a=b;if(nested_if_1){nested_if_a=nested_if_b;}}
+enterIfStatement: if(nested_if_1){nested_if_a=nested_if_b;}
-exitIfStatement: if(nested_if_1){nested_if_a=nested_if_b;}
exitStatement: if(nested_if_1){nested_if_a=nested_if_b;}
exitStatement: {a=b;if(nested_if_1){nested_if_a=nested_if_b;}}
enterStatement: if(else_if_1){else_if_1_a=else_if_1_b;}
+enterIfStatement: if(else_if_1){else_if_1_a=else_if_1_b;}
-exitIfStatement: if(else_if_1){else_if_1_a=else_if_1_b;}
exitStatement: if(else_if_1){else_if_1_a=else_if_1_b;}
-exitIfStatement: if(if_1){a=b;if(nested_if_1){nested_if_a=nested_if_b;}}elseif(else_if_1){else_if_1_a=else_if_1_b;}