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y.y
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%{
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include "DeclValidn.h"
static char* errMsg;
extern void yyerror();
extern int yylex();
extern char* yytext;
extern int yylineno;
int install ( char *sym_name ){
symrec *s;
s = getsym (sym_name);
if (s == 0){
s = putsym (sym_name);
return 0;
}
else {
//printf( "%s is already defined\n", sym_name );
return 1;
}
}
int context_check( char *sym_name )
{ if ( getsym( sym_name ) == 0 ){
//printf( "%s is an undeclared identifier\n", sym_name );
return 1;
}
return 0;
}
%}
%define parse.lac full
%define parse.error verbose
%union {
int intVal;
char* dataType;
char* strVal;
/*float floatVal;*/
char charVal;
}
%start PROGRAMM_DEF
%token <charVal> CHARACTER_VALUE
%token <intVal> INTEGER_VALUE
/*%token <floatVal> FLOAT_VALUE*/
%token <strVal> STRING_VALUE
%token <comntOne> ONELINE_COMNT
%token <intVal> INTEGER
/*%token <floatVal> FLOAT*/
%token <charVal> CHAR
%token <strVal> STRING
/*%token <dataType> DATA_TYPE*/
%token <strVal> IDENTIFIER ARRAY_IDENTIFIER
/*%token <strVal> STRUCT
*/
%token PROGRAM STARTMAIN ENDMAIN /*here is the added feature for my grammar */
%token WHILE ENDWHILE FOR TO STEP ENDFOR
%token FUNCTION RETURN END_FUNCTION STRUCT ENDSTRUCT TYPEDEF imag_type
%token IF THEN ELSEIF ELSE ENDIF SWITCH CASE DEFAULT ENDSWITCH
%token PRINT BREAK
%token VARS COMMA SINGLE_QUOTES SEMI_COLON EQUALS COLON
%token BRACKET_OPEN BRACKET_CLOSE CURLY_BRACE_OPEN CURLY_BRACE_CLOSE BIG_BRACKET_OPEN BIG_BRACKET_CLOSE LEFT_APOSTR RIGHT_APOSTR FOR_ASSIGN
%token ANDOP OROP GRTOP LESSOP EQCHK NONEQCHK ADDOP SUBOP MULOP DIVOP POWOP
%left COMMA
%right EQUALS
%left ANDOP OROP
%left EQCHK NONEQCHK
%left GRTOP LESSOP
%left ADDOP SUBOP
%left MULOP DIVOP
%left POWOP
%left BRACKET_OPEN BRACKET_CLOSE BIG_BRACKET_OPEN BIG_BRACKET_CLOSE
%%
PROGRAMM_DEF : PROGRAM IDENTIFIER '\n' NEWLINE
STRUCT_FN
FUNCTION_DEC
STARTMAIN NEWLINE
VAR_DECL
COMMAND_BODY
ENDMAIN
| PROGRAM IDENTIFIER '\n' NEWLINE
STRUCT_FN
FUNCTION_DEC
STARTMAIN NEWLINE
COMMAND_BODY
ENDMAIN
|
PROGRAM IDENTIFIER '\n' NEWLINE
STRUCT_FN
FUNCTION_DEC
STARTMAIN NEWLINE
ENDMAIN
STRUCT_FN : STRUCT_DEFN
| STRUCT_DEFN STRUCT
| /*i define structs to be optional->report definitions*/
STRUCT_DEFN : STRUCT imag_type'\n' NEWLINE
VAR_DECL
ENDSTRUCT NEWLINE
| TYPEDEF STRUCT imag_type'\n' NEWLINE
VAR_DECL
imag_type ENDSTRUCT NEWLINE
/*imaginary type for struct,we define that structs will be of only a single type,a statement included in the report also*/
NEWLINE :
| '\n'
FUNCTION_DEC : FUNCTION_DECLARATION
|
;
FUNCTION_DECLARATION: FUNCTION_STRC
| FUNCTION_STRC FUNCTION_DECLARATION
;
FUNCTION_STRC: FUNCTION IDENTIFIER BRACKET_OPEN FUNC_PARAMS BRACKET_CLOSE '\n'
FUNC_BODY
END_FUNCTION NEWLINE
{ //install( $2 );
if(install( $2 ) == 1){
char stringAlrd[500] = "Existing definition for function ";
char *funcName = $2;
strcat(stringAlrd, funcName);
//printf("Here is the name of func %s",stringSampl);
yyerror(stringAlrd);
}
}
FUNC_PARAMS : INTEGER_VALUE
| STRING_VALUE
| IDENTIFIER /*paradoxi oti oi parametroi gia mia synartisi einai eite integer,strings kai onomata metabliton,gia tis metablites den xreiazetai na exoun dilothei */
| FUNC_PARAMS COMMA FUNC_PARAMS
FUNC_BODY : VAR_DECL
COMMAND_BODY
RETURN RTN_VAL NEWLINE
| COMMAND_BODY
RETURN RTN_VAL NEWLINE
| VAR_DECL
RETURN RTN_VAL NEWLINE
| RETURN RTN_VAL NEWLINE
;
VAR_DECL : VAR_BODY
| VAR_BODY VAR_DECL
VAR_BODY : VARS DATA_TYPE VAR_LIST SEMI_COLON NEWLINE /*make a good recursion so that multiple variable declarations are supported and dont forget to always include the empty rule at the end but this produces many conflicts so check your overall grammar definitions*/
DATA_TYPE : CHAR
| INTEGER
| STRUCT imag_type/*we define also a spesific struct imag_type as an alternative type for struct variables*/
VAR_LIST : DECL_ID
| VAR_LIST COMMA VAR_LIST
DECL_ID: CHARACTER_VALUE /*you can delete this and just place in VAR_DECL the VAR_ID rule,this rule was created to install the symbols we are declaring as variables in the programm*/
| IDENTIFIER
{
if(install( $1 ) == 1){
char stringAlrd[500] = "Existing definition for variable ";
char *varName = $1;
strcat(stringAlrd, varName);
//printf("Here is the name of func %s",stringSampl);
yyerror(stringAlrd);
}
}
| ARRAY_IDENTIFIER
{
if(install( $1 ) == 1){
char stringAlrd[500] = "Existing definition for variable ";
char *varName = $1;
strcat(stringAlrd, varName);
//printf("Here is the name of func %s",stringSampl);
yyerror(stringAlrd);
}
}
VAR_ID : CHARACTER_VALUE
| IDENTIFIER
{ //install( $2 );
if(context_check( $1 ) == 1){
char notDefVar[500] = "Not existing definition for variable ";
char *varName = $1;
strcat(notDefVar, varName);
//printf("Here is the name of func %s",stringSampl);
yyerror(notDefVar);
}
}
| ARRAY_IDENTIFIER
{ //install( $2 );
if(context_check( $1 ) == 1){
char notDefVar[500] = "Not existing definition for variable ";
char *varName = $1;
strcat(notDefVar, varName);
//printf("Here is the name of func %s",stringSampl);
yyerror(notDefVar);
}
}
//FUNC_VAR: /*this is a rule for just the variables that are used as parameters inside the*/
RTN_VAL : LITERAL
| VAR_ID
;
LITERAL : INTEGER_VALUE
| STRING_VALUE
COMMAND_BODY : COMMAND
| COMMAND COMMAND_BODY /*i make this command body so that we can skip commands if we want so */
;
COMMAND : ASSIGN_CMD NEWLINE
| LOOP_CMD NEWLINE
| CONTRL_CMD NEWLINE
| PRINT_CMD NEWLINE
| BREAK_CMD NEWLINE
/*we just ignore anything after % until the end of line,later we will do multiline comments with states */
ASSIGN_CMD : VAR_ID EQUALS EXPRESSION SEMI_COLON
LOOP_CMD : WHILE_CMD
| FOR_CMD
WHILE_CMD : WHILE BRACKET_OPEN LOGIC_COND BRACKET_CLOSE NEWLINE
COMMAND_BODY
ENDWHILE
/*we accept and empty whiles->anafora*/
LOGIC_COND :
EXPRESSION LOGIC_OP EXPRESSION /*skepsou an edo xreiazetai anadromi*/
LOGIC_OP : ANDOP
| OROP
| GRTOP
| LESSOP
| EQCHK
| NONEQCHK
FOR_CMD : FOR VAR_ID FOR_ASSIGN INTEGER_VALUE TO INTEGER_VALUE STEP INTEGER_VALUE NEWLINE
COMMAND_BODY
ENDFOR
CONTRL_CMD : IF_CMD
| SWITCH_CMD
IF_CMD : IF BRACKET_OPEN LOGIC_COND BRACKET_CLOSE THEN NEWLINE
COMMAND_BODY
ELIF_STR
ELSE_BOD
ENDIF
ELIF_STR : ELIF
|
;
ELIF: ELIF_BOD
| ELIF_BOD ELIF
;
ELIF_BOD : ELSEIF NEWLINE
COMMAND_BODY /*0 one or more else ifs*/ /*so we can have recursion and repeat else ifs */
;
ELSE_BOD : ELSE NEWLINE
COMMAND_BODY /*0 or 1 else since its not must have in an if command like else ifs above*/
|
;
SWITCH_CMD : SWITCH BRACKET_OPEN EXPRESSION BRACKET_CLOSE NEWLINE
CASE_BOD
DEFAULT_BOD
ENDSWITCH
CASE_BOD : CASE_STR
| CASE_STR CASE_BOD
;
CASE_STR : CASE BRACKET_OPEN EXPRESSION BRACKET_CLOSE COLON NEWLINE
COMMAND_BODY
DEFAULT_BOD : /*0 or 1 default permitted*/
| DEFAULT COLON NEWLINE
COMMAND_BODY
| DEFAULT COLON NEWLINE
PRINT_CMD : PRINT BRACKET_OPEN LEFT_APOSTR TEXT RIGHT_APOSTR BIG_BRACKET_OPEN COMMA VAR_ID BIG_BRACKET_CLOSE BRACKET_CLOSE SEMI_COLON
| PRINT BRACKET_OPEN LEFT_APOSTR TEXT RIGHT_APOSTR BRACKET_CLOSE SEMI_COLON /*proairetiki dilosi metablitis stin print*/
TEXT : TEXT_MUL
|
TEXT_MUL : TEXT_SINGL
| TEXT_SINGL TEXT_MUL
TEXT_SINGL : STRING_VALUE
| CHARACTER_VALUE
| IDENTIFIER
| ARRAY_IDENTIFIER
BREAK_CMD : BREAK SEMI_COLON
EXPRESSION : EXPR_PART
| EXPR_PART BASIC_OPER EXPRESSION
| BRACKET_OPEN EXPRESSION BRACKET_CLOSE
EXPR_PART : INTEGER_VALUE /*NOTE!!!!! here note that we can recognise an expression like var2 = var3 + 5 * 2^(3/(var1+var3)); but not one like var2 = var3 + 5 * 2^(3-7/(var1+var3)); so you need to fix what causes a - or + operation not to work properly like in this scenario described here->maybe grammar is not complete or precedence with +-*/
| VAR_ID
| FUNC_CALL
FUNC_CALL: IDENTIFIER BRACKET_OPEN FUNC_PARMSCALL BRACKET_CLOSE
{if(context_check( $1 ) == 1) {
char stringSampl[500] = "Not existing declaration for function ";
char *funcName = $1;
strcat(stringSampl, funcName);
//printf("Here is the name of func %s",stringSampl);
yyerror(stringSampl);
}
}
FUNC_PARMSCALL : INTEGER_VALUE
| STRING_VALUE
| IDENTIFIER /*paradoxi oti oi parametroi gia mia synartisi einai eite integer,strings kai onomata metabliton,gia tis metablites den xreiazetai na exoun dilothei */
{ //install( $2 );
if(context_check( $1 ) == 1){
char notDefVarF[500] = "Not existing definition for variable ";
char *varName = $1;
strcat(notDefVarF, varName);
//printf("Here is the name of func %s",stringSampl);
yyerror(notDefVarF);
}
}
| ARRAY_IDENTIFIER
{
if(context_check( $1 ) == 1){
char notDefVar[500] = "Not existing definition for variable ";
char *varName = $1;
strcat(notDefVar, varName);
//printf("Here is the name of func %s",stringSampl);
yyerror(notDefVar);
}
}
| FUNC_PARAMS COMMA FUNC_PARAMS
BASIC_OPER : ADDOP
| SUBOP
| MULOP
| DIVOP
| POWOP
%%
int main(){
yyparse();
printf("No Errors!!\n");
return 0;
}