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compiler.y
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compiler.y
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%{
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include<stdbool.h>
int yyerror();
int table[100],i,count[100] = {0};
char symbol[100][100], temp[100];
char str[100];
char* test;
int type;
struct
{
int t[100];
char s[100][100];
}levels[1000];
%}
%union { char* str;}
%type<str> ID
%token DIGIT PRINT ID IF ENDIF ELSE START END TAB IN RANGE FOR ENDFOR FLOAT_DIGIT NL FLOAT INT
%left '+' '-'
%left '*'
%%
start: START ID '(' ')' newline '{' newline stmt newline '}' END {
FILE *fptr = fopen("if_lvl.txt", "w");
fprintf(fptr, "0");
fclose(fptr);
printf("Compiled successfully\n");
exit(0);
}
|START newline stmt END {
FILE *fptr = fopen("if_lvl.txt", "w");
fprintf(fptr, "0");
fclose(fptr);
printf("Compiled successfully\n");
exit(0);
}
;
stmt: assignment newline
|PRINT '(' expr ')' newline
|PRINT '(' expr ')' newline stmt
|PRINT '(' ID ')' newline
|PRINT '(' ID ')' newline stmt
|IF '(' COND ')' newline stmt else ENDIF newline stmt{}
|IF '(' COND ')' newline stmt else ENDIF newline
|IF '(' COND ')' newline stmt ENDIF newline stmt{}
|IF '(' COND ')' newline stmt ENDIF newline
|assignment newline stmt
| assign newline stmt
| assign newline
;
else: ELSE newline stmt
newline: NL newline
|NL
COND: DIGIT
| var '<' var
| var '>' var
| var '<''=' var
| var '>''=' var
| var '=''=' var
var :DIGIT
|FLOAT_DIGIT
|ID {strcpy(str, (char*)$1);IntDeclared(1);}
;
expr: expr '+' expr
| expr '-' expr
| expr '*' expr
| '(' expr ')'
| DIGIT
| FLOAT_DIGIT
;
assignment:INT int_assign
|FLOAT float_assign
|FLOAT ID '=' arr
|INT ID '=' arr
|ID '=' dict
;
assign: ID '=' DIGIT {strcpy(str, (char*)$1);IntDeclared(0);}
| ID '=' FLOAT_DIGIT {strcpy(str, (char*)$1);FloatDeclared(0);}
| ID '=' ID {strcpy(str, (char*)$1);IntDeclared(0);strcpy(str, (char*)$3);IntDeclared(0);}
;
int_assign:ID '=' DIGIT {strcpy(temp, (char*)$1);insert(0);}
|int_assign ',' ID '=' DIGIT {strcpy(temp, (char*)$3);insert(0);}
|int_assign ',' ID {strcpy(temp, (char*)$3);insert(0);}
|ID {strcpy(temp, (char*)$1);insert(0);}
;
float_assign:float_assign ',' ID '=' FLOAT_DIGIT {strcpy(temp, (char*)$3);insert(1);}
|float_assign ',' ID '=' DIGIT {strcpy(temp, (char*)$3);insert(1);}
| ID '=' FLOAT_DIGIT {strcpy(temp, (char*)$1);insert(1);}
| ID '=' DIGIT {strcpy(temp, (char*)$1);insert(1);}
| float_assign ',' ID {strcpy(temp, (char*)$3);insert(1);}
| ID {strcpy(temp, (char*)$1);insert(1);}
;
arr_ele1: ID
|ID ',' arr_ele1
arr_ele2:DIGIT
|DIGIT ',' arr_ele2
;
arr: '[' arr_ele1 ']'
|'[' arr_ele2 ']'
;
dict_ele1:DIGIT ':' ID dict_ele1
|DIGIT ':' ID
dict_ele2:DIGIT ':' DIGIT dict_ele2
|DIGIT ':' DIGIT
dict_ele3:ID ':' ID dict_ele3
|ID ':' ID
dict_ele4:ID ':' DIGIT dict_ele4
|ID ':' DIGIT
dict:'{' dict_ele1 '}'
| '{' dict_ele2 '}'
| '{' dict_ele3 '}'
| '{' dict_ele4 '}'
;
%%
int yyerror()
{
FILE *fptr = fopen("if_lvl.txt", "w");
fprintf(fptr, "0");
fclose(fptr);
int y = getLineNum();
printf("Line Number: %d Syntax Error\n", y);
FILE *fptr3 = fopen("line_num.txt", "w");
fprintf(fptr3,"0");
return 0;
}
int main()
{
FILE *fptr = fopen("if_lvl.txt", "w");
fprintf(fptr, "0");
fclose(fptr);
yyparse();
return 1;
}
int insert(int x)
{
int flag = 0;
int lvl = lvl_check();
for(i=0;i<count[lvl];i++)
{
if(strcmp(temp, levels[lvl].s[i])==0)
{
if(levels[lvl].t[i]==x)
{
int y = getLineNum();
printf("Redecleration of variable Line Num: %d\n", y);
}
else
{
int y = getLineNum();
printf("Multiple decleration of variable %d\n", y);
}
flag = 1;
}
}
if(flag == 0)
{
strcpy(levels[lvl].s[count[lvl]], temp);
levels[lvl].t[count[lvl]] = x;
count[lvl]++;
}
}
int lvl_check()
{
int lvl;
FILE *fptr = fopen("if_lvl.txt", "r");
char ch = fgetc(fptr);
lvl = ch-'0';
fclose(fptr);
return lvl;
}
void IntDeclared(int flag)
{
int lvl=lvl_check();
if(flag==1)
lvl--;
int k=0;
bool declared=0;
char temp2[100];
for(k=0;k<=lvl;k++)
{
for(int j=0;j<count[k];j++)
{
if(strcmp(str,levels[k].s[j])==0)
{
if(levels[k].t[j]==0){
declared=1;
break;
}
else{
printf("Incompatible types");
return;
}
}
}
}
if(declared==0)
{
int y = getLineNum();
printf("Declare before assigning a value Line No: %d\n", y);
return;
}
}
int getLineNum()
{
FILE *fptr2= fopen("line_num.txt", "r");
char x = fgetc(fptr2);
int y = x-'0'+1;
return y;
}
void FloatDeclared(int flag)
{
int lvl=lvl_check(), k=0;
if(flag==1)
lvl--;
bool declared=0;
for(k=0;k<=lvl;k++)
{
for(int j=0;j<count[k];j++)
{
if(strcmp(str,levels[k].s[j])==0)
{
if(levels[k].t[j]==1){
declared=1;
break;
}
else{
int y = getLineNum();
printf("Incompatible types line No: %d", y);
break;
}
}
}
}
if(declared==0)
{
int y = getLineNum();
printf("Declare before assigning a value Line No: %d\n", y);
}
}