/*

  * Copyright (C) 2012 David Anderson

  *

  * This file is part of JITCraft.

  *

  * JITCraft is free software: you can redistribute it and/or modify it under

  * the terms of the GNU General Public License as published by the Free

  * Software Foundation, either version 3 of the License, or (at your option)

  * any later version.

  * 

  * Foobar is distributed in the hope that it will be useful, but WITHOUT ANY

  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

  * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License along with

  * JITCraft. If not, see http://www.gnu.org/licenses/.

  */

 #ifndef _include_jitcraft_ast_h_

 #define _include_jitcraft_ast_h_

 #include "PoolAllocator.h"

 #include "Token.h"

 #include "StringPool.h"

 #include "NameBinding.h"

 namespace jc {

 #define ASTKINDS(_)             \

     _(VariableDeclaration)      \

     _(ForStatement)             \

     _(ReturnStatement)          \

     _(IntegerLiteralExpression) \

     _(BinaryExpression)         \

     _(BlockStatement)           \

     _(Assignment)               \

     _(NameProxy)                \

     _(ExpressionStatement)      \

     _(FunctionStatement)        \

     _(CallExpression)           \

     _(IfStatement)              \

     _(IndexExpression)          \

     _(EnumStatement)

 // Forward declarations.

 #define _(name) class name;

 ASTKINDS(_)

 #undef _

 class AstVisitor;

 // Interface for AST nodes.

 class AstNode : public PoolObject

 {

   public:

     enum Kind {

 #       define _(name) k##name,

         ASTKINDS(_)

 #       undef _

         AstKind_Invalid

     };

     virtual Kind kind() const = 0;

 #define _(name)     bool is##name() { return kind() == k##name; }                   \

                     name *to##name() { assert(is##name()); return (name *)this; }

     ASTKINDS(_)

 #undef _

     virtual void accept(AstVisitor *visitor) = 0;

 };

 class AstVisitor

 {

   public:

 #define _(name) virtual void visit(name *node) = 0;

     ASTKINDS(_)

 #undef _

 };

 class NameLocation

 {

   public:

     enum Kind {

         LOCAL

     };

     static NameLocation Local(VariableDeclaration *decl) {

         NameLocation loc;

         loc.kind_ = LOCAL;

         loc.u_.decl = decl;

         return loc;

     }

     Kind kind() const {

         return kind_;

     }

     VariableDeclaration *local() const {

         assert(kind() == LOCAL);

         return u_.decl;

     }

   private:

     Kind kind_;

     union {

         VariableDeclaration *decl;

     } u_;

 };

 class Statement : public AstNode

 {

 };

 class Expression : public AstNode

 {

     Type *type_;

   public:

     Expression()

       : type_(NULL)

     {

     }

     void setType(Type *type) {

         type_ = type;

     }

     Type *type() const {

         return type_;

     }

 };

 class Declaration : public Statement

 {

 };

 typedef PoolList<Statement *> StatementList;

 typedef std::vector<Expression *> ExpressionList;

 class VariableDeclaration : public Declaration

 {

     Variable *variable_;

     Expression *initialization_;

     ExpressionList *postDimensions_;

   public:

     VariableDeclaration(Variable *var, ExpressionList *postDimensions, Expression *initialization)

       : variable_(var),

         postDimensions_(postDimensions),

         initialization_(initialization)

     {

     }

     Kind kind() const {

         return kVariableDeclaration;

     }

     Variable *variable() const {

         return variable_;

     }

     Expression *initialization() const {

         return initialization_;

     }

     ExpressionList *postDimensions() const {

         return postDimensions_;

     }

     void accept(AstVisitor *visitor) {

         visitor->visit(this);

     }

 };

 class NameProxy : public Expression

 {

     Name *name_;

     BoundName *binding_;

   public:

     NameProxy(Name *name, BoundName *binding)

       : name_(name),

         binding_(binding)

     {

     }

     Kind kind() const {

         return kNameProxy;

     }

     Name *name() const {

         return name_;

     }

     void accept(AstVisitor *visitor) {

         visitor->visit(this);

     }

     BoundName *binding() const {

         return binding_;

     }

     void bind(BoundName *name) {

         assert(!binding());

         binding_ = name;

     }

 };

 class IntegerLiteralExpression : public Expression

 {

     int value_;

   public:

     IntegerLiteralExpression(int value)

       : value_(value)

     {

     }

     Kind kind() const {

         return kIntegerLiteralExpression;

     }

     int value() const {

         return value_;

     }

     void accept(AstVisitor *visitor) {

         visitor->visit(this);

     }

 };

 class BinaryExpression : public Expression

 {

     Expression *left_;

     Expression *right_;

     TokenKind token_;

   public:

     BinaryExpression(TokenKind token, Expression *left, Expression *right)

       : token_(token),

         left_(left),

         right_(right)

     {

     }

     Kind kind() const {

         return kBinaryExpression;

     }

     Expression *left() const {

         return left_;

     }

     Expression *right() const {

         return right_;

     }

     TokenKind token() const {

         return token_;

     }

     void accept(AstVisitor *visitor) {

         visitor->visit(this);

     }

 };

 class IndexExpression : public Expression

 {

     Expression *left_;

     Expression *right_;

   public:

     IndexExpression(Expression *left, Expression *right)

       : left_(left),

         right_(right)

     {

     }

     Kind kind() const {

         return kIndexExpression;

     }

     Expression *left() const {

         return left_;

     }

     Expression *right() const {

         return right_;

     }

     void accept(AstVisitor *visitor) {

         visitor->visit(this);

     }

 };

 class CallExpression : public Expression

 {

     Expression *callee_;

     ExpressionList *arguments_;

   public:

     CallExpression(Expression *callee, ExpressionList *arguments)

       : callee_(callee),

         arguments_(arguments)

     {

     }

     Kind kind() const {

         return kCallExpression;

     }

     Expression *callee() const {

         return callee_;

     }

     ExpressionList *arguments() const {

         return arguments_;

     }

     void accept(AstVisitor *visitor) {

         visitor->visit(this);

     }

 };

 class ForStatement : public Statement

 {

     Scope *scope_;

     VariableDeclaration *declaration_;

     Expression *condition_;

     Statement *update_;

     Statement *body_;

   public:

     ForStatement(Scope *scope, VariableDeclaration *declaration,

                  Expression *condition, Statement *update, Statement *body)

       : scope_(scope),

         declaration_(declaration),

         condition_(condition),

         update_(update),

         body_(body)

     {

     }

     Kind kind() const {

         return kForStatement;

     }

     VariableDeclaration *declaration() const {

         return declaration_;

     }

     Scope *scope() const {

         return scope_;

     }

     Expression *condition() const {

         return condition_;

     }

     Statement *update() const {

         return update_;

     }

     Statement *body() const {

         return body_;

     }

     void accept(AstVisitor *visitor) {

         visitor->visit(this);

     }

 };

 class ReturnStatement : public Statement

 {

     Expression *expression_;

   public:

     ReturnStatement(Expression *expression)

       : expression_(expression)

     {

     }

     Kind kind() const {

         return kReturnStatement;

     }

     Expression *expression() const {

         return expression_;

     }

     void accept(AstVisitor *visitor) {

         visitor->visit(this);

     }

 };

 class Assignment : public Expression

 {

     Expression *lvalue_;

     Expression *expression_;

   public:

     Assignment(Expression *left, Expression *right)

       : lvalue_(left),

         expression_(right)

     {

     }

     Kind kind() const {

         return kAssignment;

     }

     Expression *lvalue() const {

         return lvalue_;

     }

     Expression *expression() const {

         return expression_;

     }

     void accept(AstVisitor *visitor) {

         visitor->visit(this);

     }

 };

 class ExpressionStatement : public Statement

 {

     Expression *expression_;

   public:

     ExpressionStatement(Expression *expression)

       : expression_(expression)

     {

     }

     Kind kind() const {

         return kExpressionStatement;

     }

     Expression *expression() const {

         return expression_;

     }

     void accept(AstVisitor *visitor) {

         visitor->visit(this);

     }

 };

 class BlockStatement : public Statement

 {

     Scope *scope_;

     StatementList *statements_;

   public:

     BlockStatement(Scope *scope, StatementList *statements)

       : scope_(scope),

         statements_(statements)

     {

     }

     Kind kind() const {

         return kBlockStatement;

     }

     Scope *scope() const {

         return scope_;

     }

     StatementList *statements() const {

         return statements_;

     }

     void accept(AstVisitor *visitor) {

         visitor->visit(this);

     }

 };

 class FunctionStatement : public Statement

 {

     Scope *scope_;

     NamedFunction *fun_;

     Statement *body_;

   public:

     FunctionStatement(Scope *scope, NamedFunction *fun, Statement *body)

       : scope_(scope),

         fun_(fun),

         body_(body)

     {

     }

     Kind kind() const {

         return kFunctionStatement;

     }

     Scope *scope() const {

         return scope_;

     }

     NamedFunction *fun() const {

         return fun_;

     }

     Statement *body() const {

         return body_;

     }

     void accept(AstVisitor *visitor) {

         visitor->visit(this);

     }

 };

 class IfStatement : public Statement

 {

     Expression *condition_;

     Statement *ifTrue_;

     Statement *ifFalse_;

   public:

     IfStatement(Expression *condition, Statement *ifTrue)

       : condition_(condition),

         ifTrue_(ifTrue),

         ifFalse_(NULL)

     {

     }

     Kind kind() const {

         return kIfStatement;

     }

     Expression *condition() const {

         return condition_;

     }

     Statement *ifTrue() const {

         return ifTrue_;

     }

     Statement *ifFalse() const {

         return ifFalse_;

     }

     void setIfFalse(Statement *ifFalse) {

         ifFalse_ = ifFalse;

     }

     void accept(AstVisitor *visitor) {

         visitor->visit(this);

     }

 };

 class EnumStatement : public Statement

 {

     Name *name_;

   public:

     struct Entry {

         NamedConstant *name;

         Expression *expr;

         Entry(NamedConstant *name, Expression *expr)

           : name(name),

             expr(expr)

         {

         }

     };

     typedef std::vector<Entry> EntryList;

   public:

     EnumStatement(Name *name, EntryList *entries)

       : name_(name),

         entries_(entries)

     {

     }

     Kind kind() const {

         return kEnumStatement;

     }

     Name *name() const {

         return name_;

     }

     EntryList *entries() const {

         return entries_;

     }

     void accept(AstVisitor *visitor) {

         visitor->visit(this);

     }

   private:

     EntryList *entries_;

 };

 class Scope;

 typedef std::vector<NameProxy *> NameProxyList;

 class ParseTree : public PoolObject

 {

     StatementList *statements_;

     Scope *scope_;

     NameProxyList *unbound_;

   public:

     ParseTree(Scope *scope, StatementList *statements, NameProxyList *unbound)

       : statements_(statements),

         scope_(scope),

         unbound_(unbound)

     {

     }

     void dump(FILE *fp);

     StatementList *statements() const {

         return statements_;

     }

     Scope *scope() const {

         return scope_;

     }

     NameProxyList *unbound() const {

         return unbound_;

     }

 };

 }

 #endif // _include_jitcraft_ast_h_