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grammar.y
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grammar.y
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%{
//Declarations
#include "node.h"
#include "translator.h"
#include "stdbool.h"
#include "utils.h"
#define MAX_PARAMS 10
#define STANDARD_FUNCTIONS 5
int yylex();
int extern yylineno;
//Prints error message and line where error was found
void yyerror(node_list ** node_list_param, char const * s);
//To store user defined variables
typedef struct variable_list_node{
data_type type;
char * name;
struct variable_list_node * next;
}variable_list_node;
//To check scope when declaring and using variables
typedef struct scope_list_node{
struct variable_list_node * variables_list;
struct scope_list_node * next;
struct scope_list_node * prev;
}scope_list_node;
//To store defined functions
typedef struct function_defintion{
char * name;
int total_params;
data_type params_type[MAX_PARAMS];
}function_definition;
function_definition * functions_list[STANDARD_FUNCTIONS];
scope_list_node * scope_list_header;
scope_list_node * current_scope_list_node;
void push_scope();
void pop_scope();
void create_variable(data_type type, char * name);
variable_list_node * find_variable(char * name);
variable_list_node * find_variable_in_scope(char * name, variable_list_node * variable_header);
bool is_figure (variable_node * variable);
bool check_node_aritmethic_expression(node * node);
bool check_figure_property (node * var_node, figure_property_type property_type);
bool figure_has_property(variable_node * variable, figure_property_type property_type);
void free_variables(variable_list_node * variable_header);
void free_functions_definitions();
bool check_parameter_type(char* function_name, data_type type, int param_index);
%}
//Definitions
//Tokens
%union{
char string[500];
int num;
node * node;
node_list * node_list;
data_type data;
figure_property_type figure_property_type;
}
//Program delimeter tokens
%token START;
%token END;
//If-block tokens
%token IF;
%token OTHERWISE;
%token OPEN_PARENTHESES;
%token CLOSE_PARENTHESES;
%token OPEN_BRACES;
%token CLOSE_BRACES;
//While-block tokens
%token WHILE;
//Instruction delimeter token
%token SEMICOLON;
//Aritmethical tokens
%token<string> PLUS;
%token<string> MINUS;
%token<string> PRODUCT;
%token<string> DIVISION;
//Assign token
%token ASSIGN;
//Relational tokens
%token<string> GT;
%token<string> LT;
%token<string> GE;
%token<string> LE;
%token<string> EQ;
%token<string> NEQ;
//Logical tokens
%token<string> AND;
%token<string> OR;
//Datatypes tokens
%token<data_type> INT;
%token<data_type> STRING;
%token<data_type> CIRCLE;
%token<data_type> RECTANGLE;
%token<data_type> TRIANGLE;
//String delimeter token
%token QM;
%token COMA;
//Figure property token
%token ARROW;
//Rectangle properties tokens
%token<figure_property_type> BASE;
%token<figure_property_type> HEIGHT;
//Figure functions tokens
%token<string> PERIMETER;
%token<string> AREA;
//Rectangle functions tokens
%token<string> CREATE_R;
//Triangle properties tokens
%token<figure_property_type>SIDE_1;
%token<figure_property_type>SIDE_2;
%token<figure_property_type>SIDE_3;
//Triangle functions tokens
%token<string> CREATE_T;
//Circle properties tokens
%token<figure_property_type> RADIUS;
//Circle functions tokens
%token<string> CREATE_C;
//General functions tokens
%token PRINT;
%token READ_NUM;
//Text token
%token<string> TEXT;
//Identifier token
%token<string> IDENTIFIER;
//Num token
%token<num> NUM;
//Anything else
%token SYNTAX_ERROR;
//Non-Terminals
%type<node> code;
%type<node> instruction;
%type<node> declaration;
%type<node> factor;
%type<node> assignation;
%type<node> exp;
%type<node> term;
%type<node> param;
%type<node_list> program;
%type<node> if_block;
%type<node> while_block;
%type<node> comp;
%type<node> comp_term;
%type<node> comp_factor;
%type<string> or;
%type<data> var_type;
%type<node> otherwise_block;
%type<node> figure_property;
%type<figure_property_type> property;
%type<node> func;
%type<node> variable;
//Starting rule
%start program
%parse-param{node_list ** program_list}
%right ASSIGN
%left PLUS MINUS
%left PRODUCT DIVISION
%left LT LE GE GT
//Productions
%%
program : START code END { *program_list = (node_list *)$2; $$ = *program_list;}
;
code : instruction code { $$ = (node *) add_node_list($2, $1, NODE_LIST);}
| instruction {$$ = (node *) create_node_list($1, NODE_LIST);}
;
instruction : declaration SEMICOLON {;}
| assignation SEMICOLON {;}
| if_block {;}
| while_block {;}
| PRINT OPEN_PARENTHESES param CLOSE_PARENTHESES SEMICOLON {$$ = (node*) create_print_node($3);}
| READ_NUM OPEN_PARENTHESES variable CLOSE_PARENTHESES SEMICOLON { if(get_node_data_type($3) != INT_TYPE){
char * error_message = malloc(strlen("Error. Invalid variable data type on read_num") + 1);
sprintf(error_message, "Error. Invalid variable data type on read_num");
yyerror(NULL, error_message);
}
$$ = (node*) create_read_num_node($3);
}
;
if_block : IF {push_scope();} OPEN_PARENTHESES comp CLOSE_PARENTHESES OPEN_BRACES code CLOSE_BRACES {pop_scope();} otherwise_block {
if($10 == NULL){
$$ = (node*) create_if_node($4, $7);
}
else {
$$ = (node*) create_if_otherwise_node($4, $7, $10);
}
}
;
otherwise_block : OTHERWISE {push_scope();} OPEN_BRACES code CLOSE_BRACES {
$$ = $4;
pop_scope();
}
| {$$ = NULL;}
;
while_block : WHILE {push_scope();} OPEN_PARENTHESES comp CLOSE_PARENTHESES OPEN_BRACES code CLOSE_BRACES {
$$ = (node*) create_while_node($4, $7);
pop_scope();
}
comp : comp OR comp_term { $$ = (node*) create_logical_comp_node("||",$1, $3); }
| comp_term { $$ = $1; }
;
comp_term : comp_term AND comp_factor { $$ = (node*) create_logical_comp_node("&&",$1, $3); }
| comp_factor { $$ = $1; }
;
comp_factor : exp or exp {
$$ = (node *) create_relational_comp_node($2,$1,$3);
if($$ == NULL){
char * error_message = malloc(strlen("Error. Invalid relational expression") + 1);
sprintf(error_message, "Error. Invalid relational expression");
yyerror(NULL, error_message);
}
}
| OPEN_PARENTHESES comp CLOSE_PARENTHESES {
$$ = (node *) create_parentheses_exp_node($2);
}
;
or : LT { strcpy($$, "<");}
| LE { strcpy($$, "<=");}
| GT { strcpy($$, ">");}
| GE { strcpy($$, ">=");}
| EQ { strcpy($$, "==");}
| NEQ { strcpy($$, "!=");}
;
declaration : var_type IDENTIFIER ASSIGN param {
if(find_variable($2) != NULL){
char * error_message = malloc(strlen("Error. Variable %s already declared") + strlen($2) + 1);
sprintf(error_message, "Error. Variable %s already declared", $2);
yyerror(NULL, error_message);
}
create_variable($1, $2);
$$ = (node*) create_declaration_node($2,$1, $4);
if($$ == NULL){
char * error_message = malloc(strlen("Error. Declaration of variable %s with incorrect data type") + strlen($2) + 1);
sprintf(error_message, "Error. Declaration of variable %s with incorrect data type", $2);
yyerror(NULL, error_message);
}
}
;
var_type : INT { $$ = INT_TYPE;}
| STRING { $$ = STRING_TYPE;}
| CIRCLE { $$ = CIRCLE_TYPE;}
| RECTANGLE { $$ = RECTANGLE_TYPE;}
| TRIANGLE { $$ = TRIANGLE_TYPE;}
;
assignation : variable ASSIGN param {
$$ = (node *) create_assignation_node($1, $3);
if($$ == NULL){
char * error_message = malloc(strlen("Error. Assignation of variable %s with incorrect data type\n") + strlen(((variable_node *)($1))->name) + 1);
sprintf(error_message, "Error. Assignation of variable %s with incorrect data type", ((variable_node *)($1))->name);
yyerror(NULL, error_message);
}
}
| figure_property ASSIGN param {
$$ = (node *) create_assignation_node($1, $3);
if($$ == NULL){
char * error_message = malloc(strlen("Error. Assignation of variable %s with incorrect data type\n") + strlen((((variable_node *)((property_node *)($1))->var_node))->name) + 1);
sprintf(error_message, "Error. Assignation of variable %s with incorrect data type", (((variable_node *)((property_node *)($1))->var_node))->name);
yyerror(NULL, error_message);
}
}
;
param : exp {$$ = $1;}
| TEXT {$$ = (node *) create_constant_string_node($1);}
;
exp : exp PLUS term {
node * term_node = (node *) $3;
node * exp_node = (node *) $1;
if(get_node_data_type(exp_node)!= INT_TYPE || get_node_data_type(term_node)!= INT_TYPE ){
char * error_message = malloc(strlen("Error. Invalid aritmethic expression") + 1);
sprintf(error_message, "Error. Invalid aritmethic expression");
yyerror(NULL, error_message);
}
$$ = (node*) create_exp_node("+",$1,$3);
}
| exp MINUS term {
node * term_node = (node *) $3;
node * exp_node = (node *) $1;
if(get_node_data_type(exp_node)!= INT_TYPE || get_node_data_type(term_node)!= INT_TYPE ){
char * error_message = malloc(strlen("Error. Invalid aritmethic expression") + 1);
sprintf(error_message, "Error. Invalid aritmethic expression");
yyerror(NULL, error_message);
}
$$ = (node*) create_exp_node("-",$1,$3);
}
| term {$$ = $1;}
;
term : term PRODUCT factor { node * factor_node = (node *) $3;
node * term_node = (node *) $1;
if(get_node_data_type(factor_node)!= INT_TYPE || get_node_data_type(term_node)!= INT_TYPE ){
char * error_message = malloc(strlen("Error. Invalid aritmethic expression") + 1);
sprintf(error_message, "Error. Invalid aritmethic expression");
yyerror(NULL, error_message);
}
$$ = (node*) create_exp_node("*",$1,$3);
}
| term DIVISION factor {
node * factor_node = (node *) $3;
node * term_node = (node *) $1;
if(get_node_data_type(factor_node)!= INT_TYPE || get_node_data_type(term_node)!= INT_TYPE ){
char * error_message = malloc(strlen("Error. Invalid aritmethic expression") + 1);
sprintf(error_message, "Error. Invalid aritmethic expression");
yyerror(NULL, error_message);
}
$$ = (node*) create_exp_node("/",$1,$3);
}
| factor { $$ = $1; }
;
factor : variable {$$ = $1;}
| NUM {$$ = (node*)create_constant_int_node($1);}
| MINUS NUM {$$ = (node*)create_constant_int_node($2 * (-1));}
| figure_property {$$ = $1;}
| func {$$ = $1;}
| OPEN_PARENTHESES exp CLOSE_PARENTHESES { $$ = (node *) create_parentheses_exp_node($2);}
;
func : CREATE_C OPEN_PARENTHESES param CLOSE_PARENTHESES {
if(!check_parameter_type($1, get_node_data_type($3), 0)){
char * error_message = malloc(strlen("Error. Invalid function parameter type on function %s") + strlen($1) + 1);
sprintf(error_message, "Error. Invalid function parameter type on function %s", $1);
yyerror(NULL, error_message);
}
node_list * param_list = create_node_list($3, PARAM_NODE_LIST);
$$ = (node *) create_function_node(CIRCLE_TYPE, "create_circle", (node *) param_list );
}
| CREATE_R OPEN_PARENTHESES param COMA param CLOSE_PARENTHESES {
if(!check_parameter_type($1, get_node_data_type($3), 0) || !check_parameter_type($1, get_node_data_type($5), 1)){
char * error_message = malloc(strlen("Error. Invalid function parameter type on function %s") + strlen($1) + 1);
sprintf(error_message, "Error. Invalid function parameter type on function %s", $1);
yyerror(NULL, error_message);
}
node_list * param_list = create_node_list($5, PARAM_NODE_LIST);
param_list = add_node_list((node*)param_list, $3, PARAM_NODE_LIST);
$$ = (node *) create_function_node(RECTANGLE_TYPE, "create_rectangle", (node *) param_list );
}
| CREATE_T OPEN_PARENTHESES param COMA param COMA param CLOSE_PARENTHESES {
if(!check_parameter_type($1, get_node_data_type($3), 0) || !check_parameter_type($1, get_node_data_type($5), 1) || !check_parameter_type($1, get_node_data_type($7), 2)){
char * error_message = malloc(strlen("Error. Invalid function parameter type on function %s") + strlen($1) + 1);
sprintf(error_message, "Error. Invalid function parameter type on function %s", $1);
yyerror(NULL, error_message);
}
node_list * param_list = create_node_list($7, PARAM_NODE_LIST);
param_list = add_node_list((node*)param_list, $5, PARAM_NODE_LIST);
param_list = add_node_list((node*)param_list, $3, PARAM_NODE_LIST);
$$ = (node *) create_function_node(TRIANGLE_TYPE, "create_triangle", (node *) param_list);}
| PERIMETER OPEN_PARENTHESES factor CLOSE_PARENTHESES {
if(!check_parameter_type($1, get_node_data_type($3), 0)){
char * error_message = malloc(strlen("Error. Invalid function parameter type on function %s") + strlen($1) + 1);
sprintf(error_message, "Error. Invalid function parameter type on function %s", $1);
yyerror(NULL, error_message);
}
node_list * param_list = create_node_list($3, PARAM_NODE_LIST);
$$ = (node *) create_function_node(INT_TYPE, "get_perimeter", (node *) param_list );
}
| AREA OPEN_PARENTHESES factor CLOSE_PARENTHESES {
if(!check_parameter_type($1, get_node_data_type($3), 0)){
char * error_message = malloc(strlen("Error. Invalid function parameter type on function %s") + strlen($1) + 1);
sprintf(error_message, "Error. Invalid function parameter type on function %s", $1);
yyerror(NULL, error_message);
}
node_list * param_list = create_node_list($3, PARAM_NODE_LIST);
$$ = (node *) create_function_node(INT_TYPE, "get_area", (node *) param_list );
}
;
figure_property : variable ARROW property {
if(!check_figure_property($1,$3)){
char * error_message = malloc(strlen("Error. Invalid property\n") + 1);
sprintf(error_message, "Error. Invalid property");
yyerror(NULL, error_message);
}
$$ = (node*) create_property_node($1, $3);
}
;
property : RADIUS {$$ = RADIUS_TYPE;}
| SIDE_1 {$$ = SIDE_1_TYPE;}
| SIDE_2 {$$ = SIDE_2_TYPE;}
| SIDE_3 {$$ = SIDE_3_TYPE;}
| BASE {$$ = BASE_TYPE;}
| HEIGHT {$$ = HEIGHT_TYPE;}
;
variable: IDENTIFIER {
variable_list_node * variable = find_variable($1);
if(variable == NULL){
char * error_message = malloc(strlen("Error. Variable %s not declared") + strlen($1) + 1);
sprintf(error_message, "Error. Variable %s not declared", $1);
yyerror(NULL, error_message);
}
$$ = (node*)create_variable_node(variable->type, $1);
}
;
%%
//C Routines
int yywrap(){
return 1;
}
void yyerror(node_list ** node_list_param, char const * s){
fprintf(stderr, "%s\n", s);
fprintf(stderr, "Line: %d\n", yylineno);
exit(-1);
}
void create_variable(data_type type, char * name){
variable_list_node * variable_header = current_scope_list_node->variables_list;
if(variable_header == NULL){
current_scope_list_node->variables_list = malloc(sizeof(variable_list_node));
current_scope_list_node->variables_list->name = malloc(strlen(name) + 1);
strcpy(current_scope_list_node->variables_list->name, name);
current_scope_list_node->variables_list->type = type;
current_scope_list_node->variables_list->next = NULL;
}
else{
variable_list_node * current_variable_node = variable_header;
while(current_variable_node->next != NULL){
current_variable_node = current_variable_node->next;
}
current_variable_node->next = malloc(sizeof(variable_list_node));
current_variable_node->next->name = malloc(strlen(name) + 1);
strcpy(current_variable_node->next->name, name);
current_variable_node->next->type = type;
current_variable_node->next->next = NULL;
}
}
bool check_figure_property (node * var_node, figure_property_type property_type){
if(!is_figure((variable_node *) var_node))
return false;
return figure_has_property((variable_node *) var_node,property_type);
}
bool is_figure (variable_node * variable){
switch(variable->variable_type){
case CIRCLE_TYPE:
case RECTANGLE_TYPE:
case TRIANGLE_TYPE:
return true;
default:
return false;
}
return false;
}
bool figure_has_property(variable_node * variable, figure_property_type property_type){
switch(variable->variable_type){
case CIRCLE_TYPE:
return property_type == RADIUS_TYPE;
case RECTANGLE_TYPE:
return property_type == BASE_TYPE || property_type == HEIGHT_TYPE;
case TRIANGLE_TYPE:
return property_type == SIDE_1_TYPE || property_type == SIDE_2_TYPE || property_type == SIDE_3_TYPE;
default:
return false;
}
return false;
}
variable_list_node * find_variable(char * name){
scope_list_node * aux_scope = scope_list_header;
variable_list_node * ret_variable = NULL;
while(aux_scope != NULL){
ret_variable = find_variable_in_scope(name, aux_scope->variables_list);
if(ret_variable != NULL){
return ret_variable;
}
aux_scope = aux_scope->next;
}
return ret_variable;
}
variable_list_node * find_variable_in_scope(char * name, variable_list_node * variable_header){
variable_list_node * aux_node = variable_header;
bool found = false;
while(aux_node != NULL){
if(strcmp(aux_node->name, name) == 0){
found = true;
break;
}
aux_node = aux_node->next;
}
if (!found)
aux_node = NULL;
return aux_node;
}
void free_variables(variable_list_node * variable_header){
variable_list_node * current_variable_node = variable_header;
variable_list_node * aux_node;
while(current_variable_node != NULL){
aux_node = current_variable_node->next;
free(current_variable_node->name);
free(current_variable_node);
current_variable_node = aux_node;
}
}
bool check_parameter_type(char* function_name, data_type type, int param_index){
int i = 0;
while(i < STANDARD_FUNCTIONS && strcmp(functions_list[i]->name, function_name) != 0){
i++;
}
if(i < STANDARD_FUNCTIONS && param_index < functions_list[i]->total_params){
data_type expected = functions_list[i]->params_type[param_index];
if(expected == type || (expected == FIGURE_TYPE && (type == CIRCLE_TYPE || type == RECTANGLE_TYPE || type == TRIANGLE_TYPE)))
return true;
}
return false;
}
void free_functions_definitions(){
int i = 0;
while(i < STANDARD_FUNCTIONS){
free(functions_list[i]);
i++;
}
}
void fill_functions_definitions(){
int i = 0;
functions_list[i] = malloc(sizeof(function_definition));
functions_list[i]->name = "create_circle";
functions_list[i]->params_type[0] = INT_TYPE;
functions_list[i]->total_params = 1;
i++;
functions_list[i] = malloc(sizeof(function_definition));
functions_list[i]->name = "create_rectangle";
functions_list[i]->params_type[0] = INT_TYPE;
functions_list[i]->params_type[1] = INT_TYPE;
functions_list[i]->total_params = 2;
i++;
functions_list[i] = malloc(sizeof(function_definition));
functions_list[i]->name = "create_triangle";
functions_list[i]->params_type[0] = INT_TYPE;
functions_list[i]->params_type[1] = INT_TYPE;
functions_list[i]->params_type[2] = INT_TYPE;
functions_list[i]->total_params = 3;
i++;
functions_list[i] = malloc(sizeof(function_definition));
functions_list[i]->name = "get_perimeter";
functions_list[i]->params_type[0] = FIGURE_TYPE;
functions_list[i]->total_params = 1;
i++;
functions_list[i] = malloc(sizeof(function_definition));
functions_list[i]->name = "get_area";
functions_list[i]->params_type[0] = FIGURE_TYPE;
functions_list[i]->total_params = 1;
i++;
if (STANDARD_FUNCTIONS != i){
fprintf(stderr, "Error filling function definitions\n");
exit(-1);
}
}
void push_scope(){
scope_list_node * new_scope_list_node = malloc(sizeof(scope_list_node));
new_scope_list_node->variables_list = NULL;
new_scope_list_node->next = NULL;
new_scope_list_node->prev = current_scope_list_node;
current_scope_list_node->next = new_scope_list_node;
current_scope_list_node = new_scope_list_node;
}
void pop_scope(){
free_variables(current_scope_list_node->variables_list);
scope_list_node * aux_prev = current_scope_list_node->prev;
free(current_scope_list_node);
current_scope_list_node = aux_prev;
if(current_scope_list_node != NULL){
current_scope_list_node->next = NULL;
}
}
int main(int argc, char * argv[]){
scope_list_header = malloc(sizeof(scope_list_node));
scope_list_header->variables_list = NULL;
scope_list_header->next = NULL;
scope_list_header->prev = NULL;
current_scope_list_node = scope_list_header;
fill_functions_definitions();
struct node_list * program_list;
yyparse(&program_list);
printf("#include <stdio.h>\n");
printf("#include <math.h>\n");
printf("#include <stdlib.h>\n");
printf("#include <string.h>\n");
print_initial_functions();
printf("\n\n\nint main(int argc, char * argv[]) { \n");
char * program = translate_to_c(program_list);
printf("%s\n", program);
printf("\nfree_alloqued_pointers();");
printf("return 0;\n");
printf("}\n\n");
pop_scope();
free_functions_definitions();
free_node((node *) program_list);
free(program);
return 0;
}