;;; ECMAScript for Guile

;; Copyright (C) 2009 Free Software Foundation, Inc.

;; This program 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 2, or (at your option)
;; any later version.
;; 
;; This program 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 this program; see the file COPYING.  If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Code:

(define-module (language ecmascript parse)
  #:use-module (language ecmascript parse-lalr)
  #:use-module (language ecmascript tokenize)
  #:export (read-ecmascript read-ecmascript/1 parse-ecmascript))

(define (read-ecmascript port)
  (parse-ecmascript (make-tokenizer port) pk))

(define (read-ecmascript/1 port)
  (parse-ecmascript (make-tokenizer/1 port) pk))

(define *eof-object*
  (call-with-input-string "" read-char))

(define parse-ecmascript
  (lalr-parser
   ;; terminal (i.e. input) token types
   (lbrace rbrace lparen rparen lbracket rbracket dot semicolon comma <
    > <= >= == != === !== + - * % ++ -- << >> >>> & bor ^ ! ~ && or ? 
    colon = += -= *= %= <<= >>= >>>= &= bor= ^= / /=

    break else new var case finally return void catch for switch while
    continue function this with default if throw delete in try do
    instanceof typeof null true false

    Identifier StringLiteral NumericLiteral RegexpLiteral)


   (Program (SourceElements) -> $1
            (*eoi*) -> *eof-object*)

   ;;
   ;; Verily, here we define statements. Expressions are defined
   ;; afterwards.
   ;;

   (SourceElement (Statement) -> $1
                  (FunctionDeclaration) -> $1)

   (FunctionDeclaration (function Identifier lparen rparen lbrace FunctionBody rbrace) -> `(var ,$2 (lambda () ,$6))
                        (function Identifier lparen FormalParameterList rparen lbrace FunctionBody rbrace) -> `(var ,$2 (lambda ,$4 ,$7)))
   (FunctionExpression (function lparen rparen lbrace FunctionBody rbrace) -> `(lambda () ,$5)
                       (function Identifier lparen rparen lbrace FunctionBody rbrace) -> `(lambda () ,$6)
                       (function lparen FormalParameterList rparen lbrace FunctionBody rbrace) -> `(lambda ,$3 ,$6)
                       (function Identifier lparen FormalParameterList rparen lbrace FunctionBody rbrace) -> `(lambda ,$4 ,$7))
   (FormalParameterList (Identifier) -> `(,$1)
                        (FormalParameterList comma Identifier) -> `(,@$1 ,$3))
   (SourceElements (SourceElement) -> $1
                   (SourceElements SourceElement) -> (if (and (pair? $1) (eq? (car $1) 'begin))
                                                         `(begin ,@(cdr $1) ,$2)
                                                         `(begin ,$1 ,$2)))
   (FunctionBody (SourceElements) -> $1)

   (Statement (Block) -> $1
              (VariableStatement) -> $1
              (EmptyStatement) -> $1
              (ExpressionStatement) -> $1
              (IfStatement) -> $1
              (IterationStatement) -> $1
              (ContinueStatement) -> $1
              (BreakStatement) -> $1
              (ReturnStatement) -> $1
              (WithStatement) -> $1
              (LabelledStatement) -> $1
              (SwitchStatement) -> $1
              (ThrowStatement) -> $1
              (TryStatement) -> $1)

   (Block (lbrace StatementList rbrace) -> `(block ,$2))
   (StatementList (Statement) -> $1
                  (StatementList Statement) -> (if (and (pair? $1) (eq? (car $1) 'begin))
                                                   `(begin ,@(cdr $1) ,$2)
                                                   `(begin ,$1 ,$2)))

   (VariableStatement (var VariableDeclarationList) -> `(var ,@$2))
   (VariableDeclarationList (VariableDeclaration) -> `(,$1)
                            (VariableDeclarationList comma VariableDeclaration) -> `(,@$1 ,$2))
   (VariableDeclarationListNoIn (VariableDeclarationNoIn) -> `(,$1)
                                (VariableDeclarationListNoIn comma VariableDeclarationNoIn) -> `(,@$1 ,$2))
   (VariableDeclaration (Identifier) -> `(,$1)
                        (Identifier Initialiser) -> `(,$1 ,$2))
   (VariableDeclarationNoIn (Identifier) -> `(,$1)
                            (Identifier Initialiser) -> `(,$1 ,$2))
   (Initialiser (= AssignmentExpression) -> $1)
   (InitialiserNoIn (= AssignmentExpressionNoIn) -> $1)

   (EmptyStatement (semicolon) -> '(begin))

   (ExpressionStatement (Expression semicolon) -> $1)

   (IfStatement (if lparen Expression rparen Statement else Statement) -> `(if ,$3 ,$5 ,$7)
                (if lparen Expression rparen Statement) -> `(if ,$3 ,$5))
   
   (IterationStatement (do Statement while lparen Expression rparen semicolon) -> `(do ,$2 ,$5)

                       (while lparen Expression rparen Statement) -> `(while ,$3 ,$5)

                       (for lparen semicolon semicolon rparen Statement) -> `(for #f #f #f ,$6)
                       (for lparen semicolon semicolon Expression rparen Statement) -> `(for #f #f ,$5 ,$7)
                       (for lparen semicolon Expression semicolon rparen Statement) -> `(for #f ,$4 #f ,$7)
                       (for lparen semicolon Expression semicolon Expression rparen Statement) -> `(for #f ,$4 ,$6 ,$8)

                       (for lparen ExpressionNoIn semicolon semicolon rparen Statement) -> `(for ,$3 #f #f ,$7)
                       (for lparen ExpressionNoIn semicolon semicolon Expression rparen Statement) -> `(for ,$3 #f ,$6 ,$8)
                       (for lparen ExpressionNoIn semicolon Expression semicolon rparen Statement) -> `(for ,$3 ,$5 #f ,$8)
                       (for lparen ExpressionNoIn semicolon Expression semicolon Expression rparen Statement) -> `(for ,$3 ,$5 ,$7 ,$9)

                       (for lparen var VariableDeclarationListNoIn semicolon semicolon rparen Statement) -> `(for (var ,$4) #f #f ,$8)
                       (for lparen var VariableDeclarationListNoIn semicolon semicolon Expression rparen Statement) -> `(for (var ,$4) #f ,$7 ,$9)
                       (for lparen var VariableDeclarationListNoIn semicolon Expression semicolon rparen Statement) -> `(for (var ,$4) ,$6 #f ,$9)
                       (for lparen var VariableDeclarationListNoIn semicolon Expression semicolon Expression rparen Statement) -> `(for (var ,$4) ,$6 ,$8 ,$10)

                       (for lparen LeftHandSideExpression in Expression rparen Statement) -> `(for-in ,$3 ,$5 ,$7)
                       (for lparen var VariableDeclarationNoIn in Expression rparen Statement) -> `(for-in ,$4 ,$6 ,$8))

   (ContinueStatement (continue Identifier semicolon) -> `(continue ,$2)
                      (continue semicolon) -> `(continue))

   (BreakStatement (break Identifier semicolon) -> `(break ,$2)
                   (break semicolon) -> `(break))

   (ReturnStatement (return Expression semicolon) -> `(return ,$2)
                    (return semicolon) -> `(return))

   (WithStatement (with lparen Expression rparen Statement) -> `(with ,$3 ,$5))

   (SwitchStatement (switch lparen Expression rparen CaseBlock) -> `(switch ,$3 ,@$5))
   (CaseBlock (lbrace rbrace) -> '()
              (lbrace CaseClauses rbrace) -> $2
              (lbrace CaseClauses DefaultClause rbrace) -> `(,@$2 ,@$3)
              (lbrace DefaultClause rbrace) -> `(,$2)
              (lbrace DefaultClause CaseClauses rbrace) -> `(,@$2 ,@$3))
   (CaseClauses (CaseClause) -> `(,$1)
                (CaseClauses CaseClause) -> `(,@$1 ,$2))
   (CaseClause (case Expression colon) -> `(case ,$2)
               (case Expression colon StatementList) -> `(case ,$2 ,$4))
   (DefaultClause (default colon) -> `(default)
                  (default colon StatementList) -> `(default ,$3))

   (LabelledStatement (Identifier colon Statement) -> `(label ,$1 ,$3))

   (ThrowStatement (throw Expression semicolon) -> `(throw ,$2))

   (TryStatement (try Block Catch) -> `(try ,$2 ,$3 #f)
                 (try Block Finally) -> `(try ,$2 #f ,$3)
                 (try Block Catch Finally) -> `(try ,$2 ,$3 ,$4))
   (Catch (catch lparen Identifier rparen Block) -> `(catch ,$3 ,$5))
   (Finally (finally Block) -> `(finally ,$2))

   ;;
   ;; As promised, expressions. We build up to Expression bottom-up, so
   ;; as to get operator precedence right.
   ;;

   (PrimaryExpression (this) -> '(this)
                      (null) -> 'null
                      (true) -> #t
                      (false) -> #f
                      (Identifier) -> `(ref ,$1)
                      (StringLiteral) -> `(string ,$1)
                      (RegexpLiteral) -> `(regexp ,$1)
                      (NumericLiteral) -> `(number ,$1)
                      (ArrayLiteral) -> $1
                      (ObjectLiteral) -> $1
                      (lparen Expression rparen) -> $2)

   (ArrayLiteral (lbracket rbracket) -> '(array)
                 (lbracket Elision rbracket) -> '(array ,@$2)
                 (lbracket ElementList rbracket) -> `(array ,@$2)
                 (lbracket ElementList comma rbracket) -> `(array ,@$2)
                 (lbracket ElementList comma Elision rbracket) -> `(array ,@$2))
   (ElementList (AssignmentExpression) -> `(,$1)
                (Elision AssignmentExpression) -> `(,@$1 ,$2)
                (ElementList comma AssignmentExpression) -> `(,@$1 ,$3)
                (ElementList comma Elision AssignmentExpression) -> `(,@$1 ,@$3 ,$4))
   (Elision (comma) -> '((number 0))
            (Elision comma) -> `(,@$1 (number 0)))

   (ObjectLiteral (lbrace rbrace) -> `(object)
                  (lbrace PropertyNameAndValueList rbrace) -> `(object ,@$2))
   (PropertyNameAndValueList (PropertyName colon AssignmentExpression) -> `((,$1 . ,$3))
                             (PropertyNameAndValueList comma PropertyName colon AssignmentExpression) -> `(,@$1 (,$3 . ,$5)))
   (PropertyName (Identifier) -> `(ref ,$1)
                 (StringLiteral) -> `(string ,$1)
                 (NumericLiteral) -> `(number ,$1))

   (MemberExpression (PrimaryExpression) -> $1
                     (FunctionExpression) -> $1
                     (MemberExpression lbracket Expression rbracket) -> `(aref ,$1 ,$3)
                     (MemberExpression dot Identifier) -> `(pref ,$1 ,$3)
                     (new MemberExpression Arguments) -> `(new ,$2 ,$3))

   (NewExpression (MemberExpression) -> $1
                  (new NewExpression) -> `(new ,$2))

   (CallExpression (MemberExpression Arguments) -> `(call ,$1 ,$2)
                   (CallExpression Arguments) -> `(call ,$1 ,$2)
                   (CallExpression lbracket Expression rbracket) -> `(aref ,$1 ,$3)
                   (CallExpression dot Identifier) -> `(pref ,$1 ,$3))
   (Arguments (lparen rparen) -> '()
              (lparen ArgumentList rparen) -> $2)
   (ArgumentList (AssignmentExpression) -> `(,$1)
                 (ArgumentList comma AssignmentExpression) -> `(,@$1 ,$3))

   (LeftHandSideExpression (NewExpression) -> $1
                           (CallExpression) -> $1)

   (PostfixExpression (LeftHandSideExpression) -> $1
                      (LeftHandSideExpression ++) -> `(postinc ,$1)
                      (LeftHandSideExpression --) -> `(postdec ,$1))

   (UnaryExpression (PostfixExpression) -> $1
                    (delete UnaryExpression) -> `(delete ,$2)
                    (void UnaryExpression) -> `(void ,$2)
                    (typeof UnaryExpression) -> `(typeof ,$2)
                    (++ UnaryExpression) -> `(preinc ,$2)
                    (-- UnaryExpression) -> `(predec ,$2)
                    (+ UnaryExpression) -> `(+ ,$2)
                    (- UnaryExpression) -> `(- ,$2)
                    (~ UnaryExpression) -> `(~ ,$2)
                    (! UnaryExpression) -> `(! ,$2))

   (MultiplicativeExpression (UnaryExpression) -> $1
                             (MultiplicativeExpression * UnaryExpression) -> `(* ,$1 ,$3)
                             (MultiplicativeExpression / UnaryExpression) -> `(/ ,$1 ,$3)
                             (MultiplicativeExpression % UnaryExpression) -> `(% ,$1 ,$3))

   (AdditiveExpression (MultiplicativeExpression) -> $1
                       (AdditiveExpression + MultiplicativeExpression) -> `(+ ,$1 ,$3)
                       (AdditiveExpression - MultiplicativeExpression) -> `(- ,$1 ,$3))

   (ShiftExpression (AdditiveExpression) -> $1
                    (ShiftExpression << MultiplicativeExpression) -> `(<< ,$1 ,$3)
                    (ShiftExpression >> MultiplicativeExpression) -> `(>> ,$1 ,$3)
                    (ShiftExpression >>> MultiplicativeExpression) -> `(>>> ,$1 ,$3))

   (RelationalExpression (ShiftExpression) -> $1
                         (RelationalExpression < ShiftExpression) -> `(< ,$1 ,$3)
                         (RelationalExpression > ShiftExpression) -> `(> ,$1 ,$3)
                         (RelationalExpression <= ShiftExpression) -> `(<= ,$1 ,$3)
                         (RelationalExpression >= ShiftExpression) -> `(>= ,$1 ,$3)
                         (RelationalExpression instanceof ShiftExpression) -> `(instanceof ,$1 ,$3)
                         (RelationalExpression in ShiftExpression) -> `(in ,$1 ,$3))

   (RelationalExpressionNoIn (ShiftExpression) -> $1
                             (RelationalExpressionNoIn < ShiftExpression) -> `(< ,$1 ,$3)
                             (RelationalExpressionNoIn > ShiftExpression) -> `(> ,$1 ,$3)
                             (RelationalExpressionNoIn <= ShiftExpression) -> `(<= ,$1 ,$3)
                             (RelationalExpressionNoIn >= ShiftExpression) -> `(>= ,$1 ,$3)
                             (RelationalExpressionNoIn instanceof ShiftExpression) -> `(instanceof ,$1 ,$3))

   (EqualityExpression (RelationalExpression) -> $1
                       (EqualityExpression == RelationalExpression) -> `(== ,$1 ,$3)
                       (EqualityExpression != RelationalExpression) -> `(!= ,$1 ,$3)
                       (EqualityExpression === RelationalExpression) -> `(=== ,$1 ,$3)
                       (EqualityExpression !== RelationalExpression) -> `(!== ,$1 ,$3))

   (EqualityExpressionNoIn (RelationalExpressionNoIn) -> $1
                           (EqualityExpressionNoIn == RelationalExpressionNoIn) -> `(== ,$1 ,$3)
                           (EqualityExpressionNoIn != RelationalExpressionNoIn) -> `(!= ,$1 ,$3)
                           (EqualityExpressionNoIn === RelationalExpressionNoIn) -> `(=== ,$1 ,$3)
                           (EqualityExpressionNoIn !== RelationalExpressionNoIn) -> `(!== ,$1 ,$3))

   (BitwiseANDExpression (EqualityExpression) -> $1
                         (BitwiseANDExpression & EqualityExpression) -> `(& ,$1 ,$3))
   (BitwiseANDExpressionNoIn (EqualityExpressionNoIn) -> $1
                             (BitwiseANDExpressionNoIn & EqualityExpressionNoIn) -> `(& ,$1 ,$3))

   (BitwiseXORExpression (BitwiseANDExpression) -> $1
                         (BitwiseXORExpression ^ BitwiseANDExpression) -> `(^ ,$1 ,$3))
   (BitwiseXORExpressionNoIn (BitwiseANDExpressionNoIn) -> $1
                             (BitwiseXORExpressionNoIn ^ BitwiseANDExpressionNoIn) -> `(^ ,$1 ,$3))

   (BitwiseORExpression (BitwiseXORExpression) -> $1
                        (BitwiseORExpression bor BitwiseXORExpression) -> `(bor ,$1 ,$3))
   (BitwiseORExpressionNoIn (BitwiseXORExpressionNoIn) -> $1
                            (BitwiseORExpressionNoIn bor BitwiseXORExpressionNoIn) -> `(bor ,$1 ,$3))

   (LogicalANDExpression (BitwiseORExpression) -> $1
                         (LogicalANDExpression && BitwiseORExpression) -> `(and ,$1 ,$3))
   (LogicalANDExpressionNoIn (BitwiseORExpressionNoIn) -> $1
                             (LogicalANDExpressionNoIn && BitwiseORExpressionNoIn) -> `(and ,$1 ,$3))

   (LogicalORExpression (LogicalANDExpression) -> $1
                        (LogicalORExpression or LogicalANDExpression) -> `(or ,$1 ,$3))
   (LogicalORExpressionNoIn (LogicalANDExpressionNoIn) -> $1
                            (LogicalORExpressionNoIn or LogicalANDExpressionNoIn) -> `(or ,$1 ,$3))

   (ConditionalExpression (LogicalORExpression) -> $1
                          (LogicalORExpression ? AssignmentExpression colon AssignmentExpression) -> `(if ,$1 ,$3 ,$5))
   (ConditionalExpressionNoIn (LogicalORExpressionNoIn) -> $1
                              (LogicalORExpressionNoIn ? AssignmentExpressionNoIn colon AssignmentExpressionNoIn) -> `(if ,$1 ,$3 ,$5))

   (AssignmentExpression (ConditionalExpression) -> $1
                         (LeftHandSideExpression AssignmentOperator AssignmentExpression) -> `(,$2 ,$1 ,$3))
   (AssignmentExpressionNoIn (ConditionalExpressionNoIn) -> $1
                             (LeftHandSideExpression AssignmentOperator AssignmentExpressionNoIn) -> `(,$2 ,$1 ,$3))
   (AssignmentOperator (=) -> '=
                       (*=) -> '=
                       (/=) -> '/=
                       (%=) -> '%=
                       (+=) -> '+=
                       (-=) -> '-=
                       (<<=) -> '<<=
                       (>>=) -> '>>=
                       (>>>=) -> '>>>=
                       (&=) -> '&=
                       (^=) -> '^=
                       (bor=) -> 'bor=)

   (Expression (AssignmentExpression) -> $1
               (Expression comma AssignmentExpression) -> `(begin ,$1 ,$3))
   (ExpressionNoIn (AssignmentExpressionNoIn) -> $1
                   (ExpressionNoIn comma AssignmentExpressionNoIn) -> `(begin ,$1 ,$3))))