%{
#include <stdio.h>
#include <iostream>
using namespace std;

extern "C" {
    int yylex(void);
}

extern FILE * yyin;

void yyerror(const char * str)
{
    fprintf(stderr, "error: %s\n", str);
}

int yywrap()
{
    return 1;
}

%}

%token ASSIGN;
%token EQUAL;
%token LEQ;
%token GEQ;

%token LSHIFT;
%token RSHIFT;

%token AND;
%token OR;
%token NOT;
%token BIT_AND;
%token BIT_OR;
%token BIT_XOR;
%token BIT_NEG;

%token INCREMENT;
%token DECREMENT;

%token PLUS;
%token MINUS;
%token STAR;
%token DIVIDE;
%token MOD;

%token SEMICOLON;
%token COLON;
%token QUESTION;
%token DOLLAR;
%token DOT;
%token DOTDOTDOT;
%token DQUOTE;
%token SQUOTE;
%token COMMA;

%token LCURLY;
%token RCURLY;
%token LBRACKET;
%token RBRACKET;
%token LPAREN;
%token RPAREN;

%token BIN_NUMBER;
%token HEX_NUMBER;
%token OCT_NUMBER;
%token DEC_NUMBER;

%token ALIAS;
%token MODULE;
%token RETURN;
%token USE;

%token U1;
%token I8;
%token U8;
%token I16;
%token U16;
%token I32;
%token U32;
%token I64;
%token U64;

%token FLOAT;
%token DOUBLE;

%token VOID;

%token FFIID;
%token ID;

%%

program: /* empty */
       | use program
       | module program { printf("Saw a module declaration\n"); }
       | ffidecl program { printf("Saw a ffidecl\n"); }
       | number program { printf("Saw a number\n"); }
       | assignment program { printf("Saw an assignment\n"); }
       ;

use: USE modname SEMICOLON;

module: MODULE modname SEMICOLON;

modname: ID more_modname ;

more_modname: /* empty */
            | DOT ID more_modname
            ;

ffidecl: type FFIID DOT ID LPAREN arglist RPAREN SEMICOLON;

type: U1
    | I8
    | U8
    | I16
    | U16
    | I32
    | U32
    | I64
    | U64
    | FLOAT
    | DOUBLE
    | ID
    | type STAR
    ;

arglist: /* empty */
       | var_decl more_arglist
       ;

more_arglist: /* empty */
            | COMMA var_decl more_arglist
            | COMMA DOTDOTDOT
            ;

var_decl: type ID ;

number: BIN_NUMBER
      | OCT_NUMBER
      | DEC_NUMBER
      | HEX_NUMBER
      ;

assignment: ID ASSIGN number SEMICOLON ;

%%

int main(int argc, char * argv[])
{
    if (argc > 1)
    {
        yyin = fopen(argv[1], "r");
        if (yyin == NULL)
        {
            cerr << "Failed to open file '" << argv[1] << "'" << endl;
            return -1;
        }
    }
    yyparse();
}