1 files changed, 181 insertions, 0 deletions
diff --git a/st/SymTableTopDown.java b/st/SymTableTopDown.java
new file mode 100644
index 0000000..7258211
--- /dev/null
+++ b/st/SymTableTopDown.java
@@ -0,0 +1,181 @@
+package st;
+
+import syntaxtree.*;
+import visitor.*;
+import java.util.*;
+import misc.*;
+
+/**
+ * Performs a top-down final visit through the AST adding all local
+ * methods, attributes, extension, and scoping information to the ST
+ */
+public class SymTableTopDown<R> extends GJDepthFirst<R,SymbolTable> {
+
+    /**
+     * f0 -> "class"
+     * f1 -> Identifier()
+     * f2 -> "{"
+     * f3 -> "public"
+     * f4 -> "static"
+     * f5 -> "void"
+     * f6 -> "main"
+     * f7 -> "("
+     * f8 -> "String"
+     * f9 -> "["
+     * f10 -> "]"
+     * f11 -> Identifier()
+     * f12 -> ")"
+     * f13 -> "{"
+     * f14 -> ( VarDeclaration() )*
+     * f15 -> ( Statement() )*
+     * f16 -> "}"
+     * f17 -> "}"
+     */
+    public R visit(MainClass n, SymbolTable symt) {
+        String id = n.f1.f0.tokenImage;
+        symt.setActive(TypeEnum.classname, id);
+        symt.setActive(TypeEnum.method, "main");
+        symt.addMethod("main");
+
+
+        n.f0.accept(this, symt);
+        n.f1.accept(this, symt);
+        n.f2.accept(this, symt);
+        n.f3.accept(this, symt);
+        n.f4.accept(this, symt);
+        n.f5.accept(this, symt);
+        n.f6.accept(this, symt);
+        n.f7.accept(this, symt);
+        n.f8.accept(this, symt);
+        n.f9.accept(this, symt);
+        n.f10.accept(this, symt);
+        n.f11.accept(this, symt);
+        n.f12.accept(this, symt);
+        n.f13.accept(this, symt);
+        n.f14.accept(this, symt);
+        n.f15.accept(this, symt);
+        n.f16.accept(this, symt);
+        n.f17.accept(this, symt);
+
+        symt.removeActive(TypeEnum.method);
+        return null;
+    }
+
+    /**
+     * f0 -> "class"
+     * f1 -> Identifier()
+     * f2 -> "{"
+     * f3 -> ( VarDeclaration() )*
+     * f4 -> ( MethodDeclaration() )*
+     * f5 -> "}"
+     */
+    public R visit(ClassDeclaration n, SymbolTable symt) {
+        String id = n.f1.f0.tokenImage;
+        symt.setActive(TypeEnum.classname, id);
+
+
+        n.f0.accept(this, symt);
+        n.f1.accept(this, symt);
+        n.f2.accept(this, symt);
+        n.f3.accept(this, symt);
+        n.f4.accept(this, symt);
+        n.f5.accept(this, symt);
+        return null;
+    }
+
+    /**
+     * f0 -> "class"
+     * f1 -> Identifier()
+     * f2 -> "extends"
+     * f3 -> Identifier()
+     * f4 -> "{"
+     * f5 -> ( VarDeclaration() )*
+     * f6 -> ( MethodDeclaration() )*
+     * f7 -> "}"
+     */
+    public R visit(ClassExtendsDeclaration n, SymbolTable symt) {
+        String id = n.f1.f0.tokenImage;
+        symt.setActive(TypeEnum.classname, id);
+        symt.setExtend(n.f3.f0.tokenImage);
+
+
+        n.f0.accept(this, symt);
+        n.f1.accept(this, symt);
+        n.f2.accept(this, symt);
+        n.f3.accept(this, symt);
+        n.f4.accept(this, symt);
+        n.f5.accept(this, symt);
+        n.f6.accept(this, symt);
+        n.f7.accept(this, symt);
+        return null;
+    }
+
+    /**
+     * f0 -> Type()
+     * f1 -> Identifier()
+     * f2 -> ";"
+     */
+    public R visit(VarDeclaration n, SymbolTable symt) {
+        String id = n.f1.f0.tokenImage;
+        symt.addLocal(id);
+
+
+        n.f0.accept(this, symt);
+        n.f1.accept(this, symt);
+        n.f2.accept(this, symt);
+        return null;
+    }
+
+    /**
+     * f0 -> "public"
+     * f1 -> Type()
+     * f2 -> Identifier()
+     * f3 -> "("
+     * f4 -> ( FormalParameterList() )?
+     * f5 -> ")"
+     * f6 -> "{"
+     * f7 -> ( VarDeclaration() )*
+     * f8 -> ( Statement() )*
+     * f9 -> "return"
+     * f10 -> Expression()
+     * f11 -> ";"
+     * f12 -> "}"
+     */
+    public R visit(MethodDeclaration n, SymbolTable symt) {
+        String id = n.f2.f0.tokenImage;
+        symt.setActive(TypeEnum.method, id);
+        symt.addMethod(id);
+
+
+        n.f0.accept(this, symt);
+        n.f1.accept(this, symt);
+        n.f2.accept(this, symt);
+        n.f3.accept(this, symt);
+        n.f4.accept(this, symt);
+        n.f5.accept(this, symt);
+        n.f6.accept(this, symt);
+        n.f7.accept(this, symt);
+        n.f8.accept(this, symt);
+        n.f9.accept(this, symt);
+        n.f10.accept(this, symt);
+        n.f11.accept(this, symt);
+        n.f12.accept(this, symt);
+        symt.removeActive(TypeEnum.method);
+        return null;
+    }
+
+    /**
+     * f0 -> Type()
+     * f1 -> Identifier()
+     */
+    public R visit(FormalParameter n, SymbolTable symt) {
+        String id = n.f1.f0.tokenImage;
+        symt.addParameter(id);
+
+
+        n.f0.accept(this, symt);
+        n.f1.accept(this, symt);
+        return null;
+    }
+
+}