added same Method Declaration

src/main/java/CompilerInput.txt

@@ -1,13 +0,0 @@
-public class Example {
-
-    public int testVar;
-
-    public static int testMethod(char b){
-
-         int a;
-         int a;
-
-
-    }
-
-}

src/main/java/Main.java

@@ -16,16 +16,20 @@ import java.nio.file.Paths;
 
 public class Main {
     public static void main(String[] args) throws Exception {
-        try {
-            CharStream codeCharStream = CharStreams.fromPath(Paths.get("src/main/java/CompilerInput.txt"));
-            parseFile(codeCharStream);
-        } catch (IOException e) {
-            System.err.println("Error reading the file: " + e.getMessage());
+        if(args.length > 0) {
+
+        } else {
+            try {
+                CharStream codeCharStream = CharStreams.fromPath(Paths.get("src/main/resources/CompilerInput.java"));
+                parseFile(codeCharStream);
+            } catch (IOException e) {
+                System.err.println("Error reading the file: " + e.getMessage());
+            }
         }
     }
 
 
-    static void parseFile(CharStream codeCharStream){
+    static void parseFile(CharStream codeCharStream) {
         SimpleJavaLexer lexer = new SimpleJavaLexer(codeCharStream);
         CommonTokenStream tokens = new CommonTokenStream(lexer);
         SimpleJavaParser parser = new SimpleJavaParser(tokens);
@@ -38,6 +42,8 @@ public class Main {
         ProgramNode typedAst = (ProgramNode) SemanticAnalyzer.generateTast(ast);
 
         ByteCodeGenerator byteCodeGenerator = new ByteCodeGenerator();
-        byteCodeGenerator.visit(typedAst);
+        if (typedAst != null)
+            byteCodeGenerator.visit(typedAst);
     }
+
 }

src/main/java/ast/ClassNode.java

@@ -2,6 +2,7 @@ package ast;
 
 import ast.member.ConstructorNode;
 import ast.member.MemberNode;
+import ast.member.MethodNode;
 import ast.type.AccessTypeNode;
 import ast.type.EnumAccessTypeNode;
 
@@ -38,6 +39,16 @@ public class ClassNode implements ASTNode, Visitable {
         }
     }
 
+    public List<MethodNode> getMethods(){
+        List<MethodNode> methods = new ArrayList<>();
+        for (MemberNode member : members) {
+            if (member instanceof MethodNode methodNode) {
+                methods.add(methodNode);
+            }
+        }
+        return methods;
+    }
+
     @Override
     public TypeCheckResult accept(SemanticVisitor visitor) {
         return visitor.analyze(this);

src/main/java/ast/member/MethodNode.java

@@ -36,6 +36,22 @@ public class MethodNode implements MemberNode, Visitable {
         this.identifier = identifier;
     }
 
+    public boolean isSame(MethodNode methodNode){
+        boolean isSame = false;
+        if(methodNode.identifier.equals(identifier)){
+            if(parameters != null && methodNode.parameters != null){
+                if(parameters.parameters.size() == methodNode.parameters.parameters.size()){
+                    for(int i = 0; i < parameters.parameters.size(); i++){
+                        if(parameters.parameters.get(i).identifier.equals(methodNode.parameters.parameters.get(i).identifier)){
+                            isSame = true;
+                        }
+                    }
+                }
+            }
+        }
+        return isSame;
+    }
+
     @Override
     public TypeCheckResult accept(SemanticVisitor visitor) {
         return visitor.analyze(this);

src/main/java/ast/parameter/ParameterListNode.java

@@ -6,7 +6,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 public class ParameterListNode implements ASTNode {
-    List<ParameterNode> parameters = new ArrayList<>();
+    public List<ParameterNode> parameters = new ArrayList<>();
 
     public ParameterListNode(List<ParameterNode> parameters){
         this.parameters = parameters;

src/main/java/parser/ASTBuilder.java

@@ -54,7 +54,11 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
         AccessTypeNode accessType = (AccessTypeNode) visit(ctx.accessType());
         TypeNode returnType = (TypeNode) visit(ctx.type());
         String methodName = ctx.IDENTIFIER().getText();
-        ParameterListNode parameterListNode = (ParameterListNode) visit(ctx.parameterList());
+
+        ParameterListNode parameterListNode = null;
+        if(ctx.parameterList() != null) {
+            parameterListNode = (ParameterListNode) visit(ctx.parameterList());
+        }
         List<StatementNode> statements = new ArrayList<>();
         for (SimpleJavaParser.StatementContext stmtCtx : ctx.statement()) {
             statements.add((StatementNode) visit(stmtCtx));

src/main/java/semantic/Scope.java

@@ -9,6 +9,10 @@ public class Scope {
 
     private Stack<HashMap<String, TypeNode>> localVars;
 
+    public Scope() {
+        localVars = new Stack<HashMap<String, TypeNode>>();
+    }
+
     public void addLocalVar(String name, TypeNode type) {
         if (this.contains(name)) {
             throw new RuntimeException("Variable " + name + " already exists in this scope");

src/main/java/semantic/SemanticAnalyzer.java

@@ -5,32 +5,42 @@ import ast.*;
 import ast.expression.BinaryExpressionNode;
 import ast.expression.IdentifierExpressionNode;
 import ast.expression.UnaryExpressionNode;
+import ast.member.ConstructorNode;
 import ast.member.FieldNode;
 import ast.member.MemberNode;
 
 import ast.member.MethodNode;
+import ast.parameter.ParameterListNode;
+import ast.parameter.ParameterNode;
 import ast.statement.*;
 
 import java.util.ArrayList;
 import java.util.List;
 
+import semantic.exeptions.AlreadyDeclearedException;
 import typechecker.TypeCheckResult;
 
 public class SemanticAnalyzer implements SemanticVisitor {
 
     private ArrayList<String> currentFields = new ArrayList<>();
 
-    private Scope currentScope;
+    public static ArrayList<Exception> errors = new ArrayList<>();
 
-    public static ASTNode generateTast(ASTNode node) throws RuntimeException {
+    private Scope currentScope;
+    private ClassNode currentClass;
+
+    public static ASTNode generateTast(ASTNode node) {
         SemanticAnalyzer semanticCheck = new SemanticAnalyzer();
         ProgramNode programNode = (ProgramNode) node;
         var result = programNode.accept(semanticCheck);
         if (result.isValid()) {
             return node;
         } else {
-            throw new RuntimeException("Not Valid");
+            for (Exception e : errors) {
+                e.printStackTrace(System.out);
+            }
         }
+        return null;
     }
 
     @Override
@@ -38,6 +48,8 @@ public class SemanticAnalyzer implements SemanticVisitor {
 
         var valid = true;
 
+        currentScope = new Scope();
+
         List<ClassNode> classes = node.classes;
         for (ClassNode classNode : classes) {
             var result = classNode.accept(this);
@@ -49,12 +61,25 @@ public class SemanticAnalyzer implements SemanticVisitor {
     @Override
     public TypeCheckResult analyze(ClassNode classNode) {
         var valid = true;
+
+        currentClass = classNode;
+
         List<MemberNode> members = classNode.members;
         for (MemberNode memberNode : members) {
             if (memberNode instanceof FieldNode fieldNode) {
+                //LocalFields
                 var result = fieldNode.accept(this);
                 valid = valid && result.isValid();
             } else if (memberNode instanceof MethodNode methodNode) {
+                //Methods
+                for(MethodNode methode : currentClass.getMethods()){
+                    if(methode.equals(methodNode))
+                        break;
+                    if(methode.isSame(methodNode)){
+                        errors.add(new AlreadyDeclearedException("This method has already been declared"));
+                        valid = false;
+                    }
+                }
                 var result = methodNode.accept(this);
                 valid = valid && result.isValid();
             }
@@ -68,8 +93,23 @@ public class SemanticAnalyzer implements SemanticVisitor {
     public TypeCheckResult analyze(MethodNode methodNode) {
         var valid = true;
 
-        currentLocalScope.pushScope();
+        currentScope.pushScope();
 
+        //Parameter
+        ParameterListNode parameterListNode = methodNode.parameters;
+        if (parameterListNode != null) {
+            List<ParameterNode> parameters = parameterListNode.parameters;
+            for (ParameterNode parameter : parameters) {
+                if (currentScope.contains(parameter.identifier)) {
+                    errors.add(new AlreadyDeclearedException("Duplicated Parameter " + parameter.identifier));
+                    return new TypeCheckResult(false, null);
+                } else {
+                    currentScope.addLocalVar(parameter.identifier, parameter.type);
+                }
+            }
+        }
+
+        //Statements
         List<StatementNode> statements = methodNode.statements;
         for (StatementNode statement : statements) {
             if (statement instanceof AssignmentStatementNode assignmentStatementNode) {
@@ -80,13 +120,16 @@ public class SemanticAnalyzer implements SemanticVisitor {
                 valid = valid && result.isValid();
             }
         }
+
+        currentScope.popScope();
         return new TypeCheckResult(valid, null);
     }
 
     @Override
     public TypeCheckResult analyze(FieldNode toCheck) {
         if (currentFields.contains(toCheck.identifier)) {
-            throw new RuntimeException(toCheck.identifier + " Is Already Declared");
+            errors.add(new AlreadyDeclearedException("Already declared " + toCheck.identifier));
+            return new TypeCheckResult(false, null);
         } else {
             currentFields.add(toCheck.identifier);
         }
@@ -124,7 +167,12 @@ public class SemanticAnalyzer implements SemanticVisitor {
 
     @Override
     public TypeCheckResult analyze(VariableDeclarationStatementNode toCheck) {
-
+        if (currentScope.contains(toCheck.identifier)) {
+            errors.add(new AlreadyDeclearedException("Already declared " + toCheck.identifier + " in this scope"));
+            return new TypeCheckResult(false, null);
+        } else {
+            currentScope.addLocalVar(toCheck.identifier, toCheck.type);
+        }
         return new TypeCheckResult(true, null);
     }
 

src/main/java/semantic/exeptions/AlreadyDeclearedException.java

@@ -0,0 +1,9 @@
+package semantic.exeptions;
+
+public class AlreadyDeclearedException extends RuntimeException {
+
+    public AlreadyDeclearedException(String message) {
+        super(message);
+    }
+
+}

src/main/resources/CompilerInput.java

@@ -0,0 +1,10 @@
+public class Example {
+
+    public int a;
+
+    public static int testMethod(char x, int a){
+
+
+    }
+
+}