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parser.ypp
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%code top {
#include <stdio.h>
#include <string.h>
#include <unordered_map>
#include <math.h>
#include <iostream>
#include <stdlib.h>
#include <vector>
}
%code requires {
typedef struct symrec {
int type;
union {
int integer;
double floating_point;
int boolean;
char* string;
char character;
} value;
} symbol;
}
%code {
void yyerror (char *s); /* these are in YYlex */
extern int yylineno;
extern FILE *yyin;
extern "C" int yylex( void ); /* current token */
enum dataTypes{
INTEGER,
CHARACTER,
FLOAT,
BOOL,
STRING
};
std::vector<std::unordered_map<std::string, symbol> > contextStack;
}
%require "3.2"
%union
{
struct symrec term;
char* identifier;
char* specifier;
char* label;
int integer;
int boolean;
double floating_point;
char* string;
char character;
}
/* Types */
%type <term> exp term
/* Asociativity */
/* LITERALS */
%token <integer> TOK_INTEGER_LIT
%token <floating_point> TOK_FLOAT_LIT
%token <character> TOK_CHAR_LIT
%token <string> TOK_STRING_LIT
%token <boolean> TOK_BOOL_LIT
/* PRIMITIVES */
%token TOK_SPECIFIER_PR
%token TOK_CHAR_PR
%token TOK_STRING_PR
%token TOK_INTEGER_PR
%token TOK_FLOAT_PR
%token TOK_BOOL_PR
%token TOK_NULL_PR
/* KEYWORDS */
%token TOK_FUNCT_KEY
%token TOK_RETURN_KEY
%token TOK_UNTIL_KEY
%token TOK_WHILE_KEY
%token TOK_FOR_KEY
%token TOK_DO_KEY
%token TOK_GOTO_KEY
%token TOK_IF_KEY
%token TOK_ELSE_KEY
%token TOK_VAR_KEY
/* OPERATORS */
%token TOK_SUMEQ_OP
%token TOK_MINEQ_OP
%token TOK_MODEQ_OP
%token TOK_MULTEQ_OP
%token TOK_DIVEQ_OP
%token TOK_INC_OP
%token TOK_DEC_OP
%token TOK_SUM_OP
%token TOK_MINUS_OP
%token TOK_NOT_OP
%token TOK_QSTN_OP
%token TOK_MULT_OP
%token TOK_DIV_OP
%token TOK_MOD_OP
%token TOK_EXP_OP
%token TOK_OR_OP
%token TOK_AND_OP
%token TOK_BITXOR_OP
%token TOK_BITOR_OP
%token TOK_BITAND_OP
%token TOK_TEQ_OP
%token TOK_LEQ_OP
%token TOK_GEQ_OP
%token TOK_NEQ_OP
%token TOK_EQ_OP
%token TOK_PUT_OP
%token TOK_COLON_OP
%token TOK_LESS_OP
%token TOK_GRTR_OP
/* SYMBOLS */
%token TOK_DOT_SBL
%token TOK_LPAR_SBL
%token TOK_RPAR_SBL
%token TOK_COMMA_SBL
%token TOK_LARROW_SBL
%token TOK_RARROW_SBL
%token TOK_FATCOMMA_SBL
%token TOK_LBRACKET_SBL
%token TOK_RBRACKET_SBL
/* IDENTIFIERS */
%token<identifier> TOK_IDENTIFIER
%token<identifier> TOK_LABEL_IDENTIFIER
%token UNIDENTIFIED_TOKEN
/* MACROS */
%token TOK_STDOUT_STREAM
%token TOK_STDIN_STREAM
/* associativity */
%left TOK_SUM_OP TOK_MINUS_OP TOK_MULT_OP TOK_DIV_OP
%right TOK_EXP_OP
%%
translation_unit : statement statements
| statement
;
statement : assignment
| macro
| block
| ifelse
| while
| until
| dowhile
| TOK_LABEL_IDENTIFIER {std::cout << "label encountered at: " << yylineno << std::endl;}
| TOK_GOTO_KEY TOK_IDENTIFIER TOK_DOT_SBL {std::cout << "GOTO encountered at: " << yylineno << std::endl;}
;
statements : statement
| statements statement
;
block : TOK_LARROW_SBL TOK_RARROW_SBL
| TOK_LARROW_SBL {
std::unordered_map<std::string, symbol> newContext;
contextStack.push_back(newContext);
}
statements
TOK_RARROW_SBL {
contextStack.pop_back();
}
;
while : TOK_WHILE_KEY TOK_LPAR_SBL condition TOK_RPAR_SBL block { std::cout << "while encountered." << std::endl; }
;
until : TOK_UNTIL_KEY TOK_LPAR_SBL condition TOK_RPAR_SBL block { std::cout << "until encountered." << std::endl; }
;
dowhile : TOK_DO_KEY block TOK_WHILE_KEY TOK_LPAR_SBL condition TOK_RPAR_SBL TOK_DOT_SBL { std::cout << "do while encountered." << std::endl; }
;
ifelse : if
| if else
;
if : TOK_IF_KEY TOK_LPAR_SBL condition TOK_RPAR_SBL block { std::cout << "if encountered." << std::endl; }
;
else : TOK_ELSE_KEY block { std::cout << "else encountered." << std::endl; }
;
condition : TOK_NOT_OP exp %prec TOK_NOT_OP
| exp
| condition TOK_AND_OP exp
| condition TOK_OR_OP exp
| condition TOK_TEQ_OP exp
| condition TOK_NEQ_OP exp
| condition TOK_LEQ_OP exp
| condition TOK_GEQ_OP exp
| condition TOK_LESS_OP exp
| condition TOK_GRTR_OP exp
| TOK_LPAR_SBL condition TOK_RPAR_SBL
;
macro : TOK_STDOUT_STREAM TOK_PUT_OP exp TOK_DOT_SBL{
switch($3.type)
{
case INTEGER:
std::cout << $3.value.integer << std::endl;
break;
case BOOL:
std::cout << $3.value.boolean << std::endl;
break;
case FLOAT:
std::cout << $3.value.floating_point << std::endl;
break;
case CHARACTER:
std::cout << $3.value.character << std::endl;
break;
case STRING:
std::cout << $3.value.string << std::endl;
break;
}
}
| TOK_STDIN_STREAM TOK_PUT_OP TOK_IDENTIFIER TOK_DOT_SBL {
int numTables = contextStack.size();
int count = 0;
for(auto&& symbolTable : contextStack)
{
auto element = symbolTable.find($3);
if(element != symbolTable.end()) {
std::cout << "#: " << (*element).first << std::endl;
switch(symbolTable[$3].type)
{
case INTEGER:
std::cin >> symbolTable[$3].value.integer;
break;
case BOOL:
std::cin >> symbolTable[$3].value.boolean;
break;
case FLOAT:
std::cin >> symbolTable[$3].value.floating_point;
break;
case CHARACTER:
std::cin >> symbolTable[$3].value.character;
break;
case STRING:
std::cin >> symbolTable[$3].value.string;
break;
}
break;
}
else {
count++;
}
}
if (count == numTables){
yyerror("Identifier not found");
exit(1);
}
}
;
assignment : TOK_INTEGER_PR TOK_IDENTIFIER TOK_DOT_SBL {
if(contextStack.empty()){
std::unordered_map<std::string, symbol> globalTable;
contextStack.push_back(globalTable);
}
symrec* toBeAdded = new symrec();
toBeAdded->type = INTEGER;
toBeAdded->value.integer = 0;
contextStack.back()[$2] = *toBeAdded;
delete toBeAdded;
}
| TOK_INTEGER_PR TOK_IDENTIFIER TOK_EQ_OP exp TOK_DOT_SBL {
if(contextStack.empty()){
std::unordered_map<std::string, symbol> globalTable;
contextStack.push_back(globalTable);
}
contextStack.back()[$2] = $4;
}
| TOK_FLOAT_PR TOK_IDENTIFIER TOK_DOT_SBL {
if(contextStack.empty()){
std::unordered_map<std::string, symbol> globalTable;
contextStack.push_back(globalTable);
}
symrec* toBeAdded = new symrec();
toBeAdded->type = FLOAT;
toBeAdded->value.floating_point = 0.0;
contextStack.back()[$2] = *toBeAdded;
delete toBeAdded;
}
| TOK_FLOAT_PR TOK_IDENTIFIER TOK_EQ_OP exp TOK_DOT_SBL {
if(contextStack.empty()){
std::unordered_map<std::string, symbol> globalTable;
contextStack.push_back(globalTable);
}
contextStack.back()[$2] = $4;
}
| TOK_BOOL_PR TOK_IDENTIFIER TOK_DOT_SBL {
if(contextStack.empty()){
std::unordered_map<std::string, symbol> globalTable;
contextStack.push_back(globalTable);
}
symrec* toBeAdded = new symrec();
toBeAdded->type = BOOL;
toBeAdded->value.boolean = 0;
contextStack.back()[$2] = *toBeAdded;
delete toBeAdded;
}
| TOK_BOOL_PR TOK_IDENTIFIER TOK_EQ_OP exp TOK_DOT_SBL {
if(contextStack.empty()){
std::unordered_map<std::string, symbol> globalTable;
contextStack.push_back(globalTable);
}
contextStack.back()[$2] = $4;
}
| TOK_CHAR_PR TOK_IDENTIFIER TOK_DOT_SBL {
if(contextStack.empty()){
std::unordered_map<std::string, symbol> globalTable;
contextStack.push_back(globalTable);
}
symrec* toBeAdded = new symrec();
toBeAdded->type = CHARACTER;
toBeAdded->value.character = '\0';
contextStack.back()[$2] = *toBeAdded;
delete toBeAdded;
}
| TOK_CHAR_PR TOK_IDENTIFIER TOK_EQ_OP exp TOK_DOT_SBL {
if(contextStack.empty()){
std::unordered_map<std::string, symbol> globalTable;
contextStack.push_back(globalTable);
}
contextStack.back()[$2] = $4;
}
| TOK_STRING_PR TOK_IDENTIFIER TOK_DOT_SBL {
if(contextStack.empty()){
std::unordered_map<std::string, symbol> globalTable;
contextStack.push_back(globalTable);
}
symrec* toBeAdded = new symrec();
toBeAdded->type = STRING;
toBeAdded->value.string = "";
contextStack.back()[$2] = *toBeAdded;
delete toBeAdded;
}
| TOK_STRING_PR TOK_IDENTIFIER TOK_EQ_OP exp TOK_DOT_SBL {
if(contextStack.empty()){
std::unordered_map<std::string, symbol> globalTable;
contextStack.push_back(globalTable);
}
contextStack.back()[$2] = $4;
}
| TOK_IDENTIFIER TOK_EQ_OP exp TOK_DOT_SBL {
int numTables = contextStack.size();
int count = 0;
for (auto symbolTable : contextStack)
{
std::cout << "[ ";
for (auto element : symbolTable)
std::cout << element.first << " ";
std::cout << "]" << std::endl;
auto element = symbolTable.find($1);
if(element != symbolTable.end()) {
switch(symbolTable[$1].type)
{
case INTEGER:
symbolTable[$1].value.integer = $3.value.integer;
break;
case BOOL:
symbolTable[$1].value.boolean = $3.value.boolean;
break;
case FLOAT:
symbolTable[$1].value.floating_point = $3.value.floating_point;
break;
case CHARACTER:
symbolTable[$1].value.character = $3.value.character;
break;
case STRING:
symbolTable[$1].value.string = $3.value.string;
break;
}
break;
}
else{
count++;
}
}
if (count == numTables){
yyerror("Identifier not found");
exit(1);
}
}
| TOK_IDENTIFIER TOK_SUMEQ_OP exp TOK_DOT_SBL {
int numTables = contextStack.size();
int count = 0;
for (auto&& symbolTable : contextStack)
{
auto element = symbolTable.find($1);
if(element != symbolTable.end()) {
switch(symbolTable[$1].type)
{
case INTEGER:
symbolTable[$1].value.integer += $3.value.integer;
break;
case BOOL:
symbolTable[$1].value.boolean += $3.value.boolean;
break;
case FLOAT:
symbolTable[$1].value.floating_point += $3.value.floating_point;
break;
case CHARACTER:
symbolTable[$1].value.character += $3.value.character;
break;
case STRING:
yyerror("cannot sum and equal to string");
exit(1);
break;
}
break;
}
else{
count++;
}
}
if (count == numTables){
yyerror("Identifier not found");
exit(1);
}
}
| TOK_IDENTIFIER TOK_MINEQ_OP exp TOK_DOT_SBL {
int numTables = contextStack.size();
int count = 0;
for (auto&& symbolTable : contextStack)
{
auto element = symbolTable.find($1);
if(element != symbolTable.end()){
switch(symbolTable[$1].type)
{
case INTEGER:
symbolTable[$1].value.integer -= $3.value.integer;
break;
case BOOL:
symbolTable[$1].value.boolean -= $3.value.boolean;
break;
case FLOAT:
symbolTable[$1].value.floating_point -= $3.value.floating_point;
break;
case CHARACTER:
symbolTable[$1].value.character -= $3.value.character;
break;
case STRING:
yyerror("cannot minus and equal to string");
exit(1);
break;
}
break;
}
else{
count++;
}
}
if (count == numTables){
yyerror("Identifier not found");
exit(1);
}
}
| TOK_IDENTIFIER TOK_MULTEQ_OP exp TOK_DOT_SBL {
int numTables = contextStack.size();
int count = 0;
for (auto&& symbolTable : contextStack)
{
auto element = symbolTable.find($1);
if(element != symbolTable.end()) {
switch(symbolTable[$1].type)
{
case INTEGER:
symbolTable[$1].value.integer *= $3.value.integer;
break;
case BOOL:
symbolTable[$1].value.boolean *= $3.value.boolean;
break;
case FLOAT:
symbolTable[$1].value.floating_point *= $3.value.floating_point;
break;
case CHARACTER:
symbolTable[$1].value.character *= $3.value.character;
break;
case STRING:
yyerror("cannot multiply and equal to string");
exit(1);
break;
}
break;
}
else{
count++;
}
}
if (count == numTables){
yyerror("Identifier not found");
exit(1);
}
}
| TOK_IDENTIFIER TOK_DIVEQ_OP exp TOK_DOT_SBL {
int numTables = contextStack.size();
int count = 0;
for (auto&& symbolTable : contextStack)
{
auto element = symbolTable.find($1);
if(element != symbolTable.end()) {
switch(symbolTable[$1].type)
{
case INTEGER:
symbolTable[$1].value.integer /= $3.value.integer;
break;
case BOOL:
symbolTable[$1].value.boolean /= $3.value.boolean;
break;
case FLOAT:
symbolTable[$1].value.floating_point /= $3.value.floating_point;
break;
case CHARACTER:
symbolTable[$1].value.character /= $3.value.character;
break;
case STRING:
yyerror("cannot divide and equal to string");
exit(1);
break;
}
break;
}
else{
count++;
}
}
if (count == numTables){
yyerror("Identifier not found");
exit(1);
}
}
| TOK_IDENTIFIER TOK_MODEQ_OP exp TOK_DOT_SBL {
int numTables = contextStack.size();
int count = 0;
for (auto&& symbolTable : contextStack)
{
auto element = symbolTable.find($1);
if(element != symbolTable.end()) {
switch(symbolTable[$1].type)
{
case INTEGER:
symbolTable[$1].value.integer %= $3.value.integer;
break;
case BOOL:
symbolTable[$1].value.boolean %= $3.value.boolean;
break;
case FLOAT:
yyerror("cannot modulus and equal to double");
exit(1);
break;
case CHARACTER:
symbolTable[$1].value.character %= $3.value.character;
break;
case STRING:
yyerror("cannot modulus and equal to string");
exit(1);
break;
}
break;
}
else{
count++;
}
}
if (count == numTables){
yyerror("Identifier not found");
exit(1);
}
}
;
exp : TOK_MINUS_OP term %prec TOK_MINUS_OP {
switch($2.type)
{
case INTEGER:
$$.type = INTEGER;
$$.value.integer = -$2.value.integer;
break;
case BOOL:
$$.type = BOOL;
$$.value.boolean = -$2.value.boolean;
break;
case FLOAT:
$$.type = FLOAT;
$$.value.floating_point = -$2.value.floating_point;
break;
case CHARACTER:
$$.type = CHARACTER;
$$.value.character = -$2.value.character;
break;
case STRING:
yyerror("can't negate a string.");
exit(1);
break;
}
}
| term {
switch($1.type)
{
case INTEGER:
$$.type = INTEGER;
$$.value.integer = $1.value.integer;
break;
case BOOL:
$$.type = BOOL;
$$.value.boolean = $1.value.boolean;
break;
case FLOAT:
$$.type = FLOAT;
$$.value.floating_point = $1.value.floating_point;
break;
case CHARACTER:
$$.type = CHARACTER;
$$.value.character = $1.value.character;
break;
case STRING:
$$.type = STRING;
$$.value.string = $1.value.string;
break;
}
}
| exp TOK_SUM_OP term {
switch($3.type)
{
case INTEGER:
$$.type = INTEGER;
$$.value.integer = $1.value.integer + $3.value.integer;
break;
case BOOL:
$$.type = BOOL;
$$.value.boolean = $1.value.boolean + $3.value.boolean;
break;
case FLOAT:
$$.type = FLOAT;
$$.value.floating_point = $1.value.floating_point + $3.value.floating_point;
break;
case CHARACTER:
$$.type = CHARACTER;
$$.value.character = $1.value.character + $3.value.floating_point;
break;
case STRING:
$$.type = STRING;
yyerror("cannot add strings");
exit(1);
break;
}
}
| exp TOK_MINUS_OP term {
switch($3.type)
{
case INTEGER:
$$.type = INTEGER;
$$.value.integer = $1.value.integer - $3.value.integer;
break;
case BOOL:
$$.type = BOOL;
$$.value.boolean = $1.value.boolean - $3.value.boolean;
break;
case FLOAT:
$$.type = FLOAT;
$$.value.floating_point = $1.value.floating_point - $3.value.floating_point;
break;
case CHARACTER:
$$.type = CHARACTER;
$$.value.character = $1.value.character - $3.value.floating_point;
break;
case STRING:
yyerror("cannot substract strings");
exit(1);
break;
}
}
| exp TOK_MULT_OP term {
switch($3.type)
{
case INTEGER:
$$.type = INTEGER;
$$.value.integer = $1.value.integer * $3.value.integer;
break;
case BOOL:
$$.type = BOOL;
$$.value.boolean = $1.value.boolean * $3.value.boolean;
break;
case FLOAT:
$$.type = FLOAT;
$$.value.floating_point = $1.value.floating_point * $3.value.floating_point;
break;
case CHARACTER:
$$.type = CHARACTER;
$$.value.character = $1.value.character * $3.value.floating_point;
break;
case STRING:
yyerror("cannot multiply strings");
exit(1);
break;
}
}
| exp TOK_DIV_OP term {
switch($3.type)
{
case INTEGER:
$$.type = INTEGER;
$$.value.integer = $1.value.integer / $3.value.integer;
break;
case BOOL:
$$.type = BOOL;
$$.value.boolean = $1.value.boolean / $3.value.boolean;
break;
case FLOAT:
$$.type = FLOAT;
$$.value.floating_point = $1.value.floating_point / $3.value.floating_point;
break;
case CHARACTER:
$$.type = CHARACTER;
$$.value.character = $1.value.character / $3.value.floating_point;
break;
case STRING:
yyerror("cannot divide strings");
exit(1);
break;
}
}
| exp TOK_MOD_OP term {
switch($3.type)
{
case INTEGER:
$$.type = INTEGER;
$$.value.integer = $1.value.integer % $3.value.integer;
break;
case BOOL:
$$.type = BOOL;
$$.value.boolean = $1.value.boolean % $3.value.boolean;
break;
case FLOAT:
yyerror("cannot modulus floating point");
exit(1);
break;
case CHARACTER:
$$.type = CHARACTER;
$$.value.character = $1.value.character % $3.value.character;
break;
case STRING:
yyerror("cannot modulus strings");
exit(1);
break;
}
}
| exp TOK_EXP_OP term {
switch($3.type)
{
case INTEGER:
$$.type = INTEGER;
$$.value.integer = pow($1.value.integer,$3.value.integer);
break;
case BOOL:
$$.type = BOOL;
$$.value.boolean = pow($1.value.boolean,$3.value.boolean);
break;
case FLOAT:
$$.type = FLOAT;
$$.value.floating_point = pow($1.value.floating_point,$3.value.floating_point);
break;
case CHARACTER:
$$.type = CHARACTER;
$$.value.character = pow($1.value.character,$3.value.character);
break;
case STRING:
yyerror("cannot exponentiate strings");
exit(1);
break;
}
}
| TOK_LPAR_SBL exp TOK_RPAR_SBL {
switch($2.type)
{
case INTEGER:
$$.type = INTEGER;
$$.value.integer = $2.value.integer;
break;
case BOOL:
$$.type = BOOL;
$$.value.boolean = $2.value.boolean;
break;
case FLOAT:
$$.type = FLOAT;
$$.value.floating_point = $2.value.floating_point;
break;
case CHARACTER:
$$.type = CHARACTER;
$$.value.character = $2.value.character;
break;
case STRING:
$$.type = STRING;
$$.value.string = $2.value.string;
break;
}
}
;
term : TOK_INTEGER_LIT {
$$.type = INTEGER;
$$.value.integer = $1;
}
| TOK_FLOAT_LIT {
$$.type = FLOAT;
$$.value.floating_point = $1;
}
| TOK_STRING_LIT {
$$.type = STRING;
$$.value.string = $1;
}
| TOK_CHAR_LIT {
$$.type = CHARACTER;
$$.value.character = $1;
}
| TOK_BOOL_LIT {
$$.type = BOOL;
$$.value.boolean = $1;
}
| TOK_IDENTIFIER {
int numTables = contextStack.size();
int count = 0;
for(auto symbolTable : contextStack)
{
auto element = symbolTable.find($1);
if(element != symbolTable.end()){
// std::cout << "Found identifier: " << $1 << " " << symbolTable[$1].value.integer << std::endl;
switch(symbolTable[$1].type)
{
case INTEGER:
$$.type = INTEGER;
$$.value.integer = symbolTable[$1].value.integer;
break;
case BOOL:
$$.type = BOOL;
$$.value.boolean = symbolTable[$1].value.boolean;
break;
case FLOAT:
$$.type = FLOAT;
$$.value.floating_point = symbolTable[$1].value.floating_point ;
break;
case CHARACTER:
$$.type = CHARACTER;
$$.value.character = symbolTable[$1].value.character;
break;
case STRING:
$$.type = STRING;
$$.value.string = symbolTable[$1].value.string;
break;
}
break;
}
else{
count++;
}
}
if (count == numTables){
yyerror("Identifier not found");
exit(1);
}
}
;
%%
int main(int argc, char **argv)
{
++argv, --argc;
if (argc > 0)
yyin = fopen(argv[0], "r");
else
yyin = stdin;
yyparse();
return 0;
}
void yyerror(char *message)
{
extern FILE *yyout;
fprintf(yyout,"\nError at line %5d. (%s) \n", yylineno,message);
}