set basic repo structure

grammar/MXLexer.g4

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+lexer grammar MXLexer;
+
+// Keywords
+INT: 'int';
+VOID: 'void';
+IF: 'if';
+ELSE: 'else';
+RETURN: 'return';
+
+// Operators
+PLUS: '+';
+MINUS: '-';
+MULTIPLY: '*';
+DIVIDE: '/';
+ASSIGN: '=';
+
+// Punctuation
+LPAREN: '(';
+RPAREN: ')';
+LBRACE: '{';
+RBRACE: '}';
+SEMICOLON: ';';
+
+// Identifiers
+ID: [a-zA-Z_][a-zA-Z_0-9]*;
+
+// Literals
+INT_LITERAL: [0-9]+;
+
+// Whitespace and comments
+WS: [ \t\r\n]+ -> skip;
+COMMENT: '//' ~[\r\n]* -> skip;

grammar/MXParser.g4

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+parser grammar MXParser;
+
+options { tokenVocab=MXLexer; }
+
+mxprog
+    : function* EOF
+    ;
+
+function
+    : type ID LPAREN RPAREN block
+    ;
+
+type
+    : INT
+    | VOID
+    ;
+
+block
+    : LBRACE statement* RBRACE
+    ;
+
+statement
+    : expression SEMICOLON
+    | returnStmt
+    | ifStmt
+    ;
+
+expression
+    : INT_LITERAL
+    | ID
+    | expression (PLUS | MINUS | MULTIPLY | DIVIDE) expression
+    | LPAREN expression RPAREN
+    ;
+
+returnStmt
+    : RETURN expression? SEMICOLON
+    ;
+
+ifStmt
+    : IF LPAREN expression RPAREN statement (ELSE statement)?
+    ;

grammar/build.sh

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+#!/bin/bash
+# Get the directory of the script
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+# Change to the script directory
+cd "$SCRIPT_DIR"
+# Set the output directory
+OUTPUT_DIR="../src/semantic/antlr-generated"
+# Create the output directory if it doesn't exist
+mkdir -p "$OUTPUT_DIR"
+# Run ANTLR to generate lexer and parser
+antlr4 -Dlanguage=Cpp -no-listener -visitor MXLexer.g4 MXParser.g4 -o "$OUTPUT_DIR"
+# Return to the original directory
+cd - > /dev/null