/*
 *
 * File : chiaa.yacc
 * Last Modified : 14 December 2002
 *
 *
*/

%{
#include <stdio.h>
  typedef enum {STR, NUMBER, DUMMY, LOGOPER, NUMOPER, ASSIGNOPER, TYPE, RESWORD} myType;
  typedef union{
        char *c;
        int i;
  }types;

  typedef struct tnode{
        myType type;
        types info;
        struct tnode *left;
        struct tnode *right;
  } typenode, *typeptr;

  static int count = 1;
  static int label = 1;


  typeptr empty_node();
  typeptr new_node(char *info, myType t);
  typeptr new_int_node (int info);
  typeptr new_dummy_node();
  typeptr join_child_node(typeptr t1, typeptr t2, typeptr t3);

  void print_tree(typeptr t);
  void generate(typeptr t);

%}

%union{
        typeptr tNode;
        char *cVal;
        int iVal;
}

%type <tNode> program method_declaration type variable_type statement_block
%type <tNode> statement simple_statement assignment_statement declarative_statement declarative_statement2
%type <tNode> expr or_expr and_expr relop_expr ltgt_expr addop_expr mulop_expr term value
%type <tNode> compound_statement if_statement loop_statement while_statement dowhile_statement for_statement
%type <tNode> for_expr for_expr2

%token <cVal> VOID INT NAME ASSIGNOP OR AND NOT RELOP LTGT ADDOP MULOP
%token <cVal> IF FOR WHILE DO
%token <iVal> NUMBER

%token LPAREN RPAREN OBRACE EBRACE COMMA SEMICOLON

%nonassoc IFX
%nonassoc ELSE

%%

program         :       method_declaration              {
                                                        printf("Abstract Syntax Tree:\n(");
                                                        print_tree($1);
                                                        printf(")\n");
                                                        printf("\nTotal No Of Lines:%d\n\n",yylineno);
                                                        printf("Code Generated:\n");
                                                        generate($1);
                                                        }
                ;

method_declaration :    type NAME LPAREN RPAREN OBRACE statement_block EBRACE
                                                        {
                                                        $1 = join_child_node($1,new_node($2,STR),NULL);
                                                        $$ = join_child_node(new_dummy_node(),$1, $6);
                                                        }
                ;


type            :       VOID                            {$$= new_node($1,TYPE); }
                |       variable_type                   {$$=$1; }
                ;

variable_type   :       INT                             {$$= new_node($1,TYPE); }
                ;

statement_block :       /*empty*/                       {$$ = NULL;}
                |       statement statement_block       {$$ = join_child_node(new_dummy_node(),$1,$2);}
                ;

statement       :       simple_statement SEMICOLON      {$$ = $1; }
                |       compound_statement              {$$ = $1; }
                |       OBRACE statement_block EBRACE   {$$ = $2; }
                ;

simple_statement :      assignment_statement            {$$= $1; }
                |       declarative_statement           {$$= $1; }
                ;

declarative_statement : variable_type assignment_statement declarative_statement2
                                                        {$$ = join_child_node($1,$2,$3); }
                ;

declarative_statement2 : /*empty*/                      {$$ = NULL; }
                |       COMMA assignment_statement declarative_statement2
                                                        {$$ = join_child_node(new_dummy_node(),$2,$3); }
                ;


assignment_statement :  NAME                            {$$ = new_node($1,STR); }
                |       NAME ASSIGNOP expr              {$$ = join_child_node(new_node($2,ASSIGNOPER),new_node($1,STR),$3); }
                ;

expr            :       or_expr                         {$$ =$1; }
                ;

or_expr         :	or_expr OR and_expr             {$$ = join_child_node(new_node($2,LOGOPER),$1,$3);}
                |       and_expr                        {$$ =$1; }
	        ;

and_expr        :       and_expr AND relop_expr         {$$ = join_child_node(new_node($2,LOGOPER),$1,$3);}
                |       relop_expr                      {$$ =$1; }
                ;

relop_expr      :       relop_expr RELOP ltgt_expr      {$$ = join_child_node(new_node($2,LOGOPER),$1,$3);}
                |       ltgt_expr                       {$$ =$1; }
                ;

ltgt_expr       :       ltgt_expr LTGT addop_expr       {$$ = join_child_node(new_node($2,LOGOPER),$1,$3);}
                |       addop_expr                      {$$ =$1; }
                ;

addop_expr      :       addop_expr ADDOP mulop_expr     {$$ = join_child_node(new_node($2,NUMOPER),$1,$3);}
                |       mulop_expr                      {$$= $1; }
                ;

mulop_expr      :       mulop_expr MULOP term           {$$ = join_child_node(new_node($2,NUMOPER),$1,$3);}
                |       term                            {$$= $1; }
                ;

term	        :	NOT value                       {$$ = join_child_node(new_node($1,LOGOPER),$2,NULL);}
                |       ADDOP value                     {$$ = join_child_node(new_node($1,NUMOPER),$2,NULL);}
                |       value                           {$$= $1; }
	        ;

value	        :	NAME                            {$$ = new_node($1,STR);}

                |       NUMBER                          {$$ = new_int_node($1);}

                |       LPAREN expr RPAREN              {$$ = $2; }
                ;

compound_statement :    if_statement                    { $$ = $1; }
                |       loop_statement                  { $$ = $1; }
                ;

if_statement    :       IF LPAREN expr RPAREN statement %prec IFX
                                                        {$$=join_child_node(new_node($1,RESWORD), $3, $5);}
                |       IF LPAREN expr RPAREN statement ELSE statement
                                                        {
                                                        typeptr temp = join_child_node(new_dummy_node(),$5,$7);
                                                        $$= join_child_node(new_node($1,RESWORD),$3,temp);
                                                        }
                ;

loop_statement  :       while_statement                 {$$=$1; }
                |       dowhile_statement               {$$=$1; }
                |       for_statement                   {$$=$1; }
                ;

while_statement :       WHILE LPAREN expr RPAREN statement
                                                        {$$=join_child_node(new_node($1,RESWORD),$3,$5);}
                ;

dowhile_statement :     DO statement WHILE LPAREN expr RPAREN SEMICOLON
                                                        {
                                                        //typeptr temp = join_child_node(new_node($3,RESWORD),$5,NULL);
                                                        $$=join_child_node(new_node($1,RESWORD),$5,$2);
                                                        }
                ;

for_statement   :       FOR LPAREN SEMICOLON SEMICOLON RPAREN statement
                                                        {$$ = join_child_node(new_node($1,RESWORD),new_dummy_node(),$6); }
                |       FOR LPAREN for_expr SEMICOLON SEMICOLON RPAREN statement
                                                        {
                                                        typeptr temp = join_child_node(new_dummy_node(),$3,NULL);
                                                        $$ = join_child_node(new_node($1,RESWORD),temp,$7);
                                                        }
                |       FOR LPAREN SEMICOLON expr SEMICOLON RPAREN statement
                                                        {
                                                        typeptr temp1 = join_child_node(new_dummy_node(),$4,NULL);
                                                        typeptr temp2 = join_child_node(new_dummy_node(),NULL,temp1);
                                                        $$ = join_child_node(new_node($1,RESWORD),temp2,$7);
                                                        }
                |       FOR LPAREN SEMICOLON SEMICOLON for_expr RPAREN statement
                                                        {
                                                        typeptr temp1 = join_child_node(new_dummy_node(),NULL,$5);
                                                        typeptr temp2 = join_child_node(new_dummy_node(),NULL,temp1);
                                                        $$= join_child_node(new_node($1,RESWORD),temp2,$7);
                                                        }
                |       FOR LPAREN for_expr SEMICOLON expr SEMICOLON RPAREN statement
                                                        {
                                                        typeptr temp1 = join_child_node(new_dummy_node(),$5,NULL);
                                                        typeptr temp2 = join_child_node(new_dummy_node(),$3,temp1);
                                                        $$= join_child_node(new_node($1,RESWORD),temp2,$8);
                                                        }
                |       FOR LPAREN for_expr SEMICOLON SEMICOLON for_expr RPAREN statement
                                                        {
                                                        typeptr temp1 = join_child_node(new_dummy_node(),NULL,$6);
                                                        typeptr temp2 = join_child_node(new_dummy_node(),$3,temp1);
                                                        $$= join_child_node(new_node($1,RESWORD),temp2,$8);
                                                        }
                |       FOR LPAREN SEMICOLON expr SEMICOLON for_expr RPAREN statement
                                                        {
                                                        typeptr temp1 = join_child_node(new_dummy_node(),$4,$6);
                                                        typeptr temp2 = join_child_node(new_dummy_node(),NULL,temp1);
                                                        $$= join_child_node(new_node($1,RESWORD),temp2,$8);
                                                        }
                |       FOR LPAREN for_expr SEMICOLON expr SEMICOLON for_expr RPAREN statement
                                                        {
                                                        typeptr temp1 = join_child_node(new_dummy_node(),$5,$7);
                                                        typeptr temp2 = join_child_node(new_dummy_node(),$3,temp1);
                                                        $$= join_child_node(new_node($1,RESWORD),temp2,$9);
                                                        }
                ;

for_expr        :       declarative_statement           {$$= $1; }
                |       assignment_statement for_expr2
                                                        {$$= join_child_node(new_dummy_node(),$1,$2);}
                ;

for_expr2       :       /*empty*/                       {$$=NULL; }
                |       COMMA assignment_statement for_expr2
                                                        {$$= join_child_node(new_dummy_node(),$2,$3);}
                ;



%%
#include <stdio.h>
#include <stdlib.h>
#include "lex.yy.c"
#include "chiaa.c"

main(){
       yyparse();
}

yyerror(char *s) {
        fprintf(stderr, "Line: %d ;%s\n",yylineno,s);
}<!--'"</title></head>-->

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