%{
#include <stdio.h>
int yylex();
int yyerror(const char* p) { fprintf(stderr, p); }
%}

%define parse.trace

%union {
       char* sym;
       float num;
}

%token <sym> ID
%token STOP
%token <num> NUM
%token STRING
%token INDENT DEDENT
%token IF ELIF ELSE

%right GETS
%left '+' '-'
%left '/' '*'
%left MAPS

%%
program:	statements | statements statement;
statements:	statements statement STOP
		| statements STOP
		| // null production ;
statement: 	assignment | funcall | conditional;
assignment: 	ID GETS expr;
assignments: 	assignments assignment STOP | // null production;
expr:		funcdef
		| funcall
		| objdef
		| expr '+' expr
		| expr '-' expr
		| expr '*' expr
		| expr '/' expr
		| '(' expr ')'
		| ID | NUM | STRING;
		
funcdef: 	param MAPS expr | param MAPS block;
param:	 	ID | '_' | // null production;

funcall: 	ID '(' exprlist ')'
exprlist:	exprlist ',' expr | expr | // null production;

conditional: 	IF expr block elifs
		| IF expr block elifs ELSE block;
elifs:		ELIF expr block elifs| // null production;

objdef:		'{' block_assignments '}' | '{' '}'

block: 		STOP INDENT statement statements DEDENT
block_assignments: STOP INDENT assignments DEDENT
%%