#include <u.h>
#include <libc.h>
#include <bio.h>

#include "apl9.h"

Rune *prompt(Rune *);
Datum *evalline(Rune *);

Biobuf *stdin;

void
main(int argc, char *argv[])
{
	int off = 0;
	stdin = Bfdopen(0, OREAD);
	globalsymtab = newsymtab();
	currentsymtab = globalsymtab;
	traceeval = 0;

	ARGBEGIN{
	case 't':
			traceeval = 1;
			break;
	}ARGEND

	while(!off){
		Rune *input = prompt(L"\t");
		Datum *result = evalline(input);
		if(result == nil){
			if(errormsg == nil)
				off = 1;
			else
				print("ERROR: %S\n", errormsg);
		}else{
			if(result[0].shy == 0)
				print("%S\n", ppdatum(*result));
			free(result);
		}
	}
	exits(nil);
}

Rune *
prompt(Rune *pr)
{
	Rune line[MAX_LINE_LENGTH];

	print("%S",pr);

	int i = 0;
	line[0] = 0;
	while(i == 0 || line[i-1] != '\n')
		line[i++] = Bgetrune(stdin);
	line[i-1] = 0;
	return runestrdup(line);
}

Datum *
evalline(Rune *line)
{
	Statement *stmts = lexline(line, globalsymtab);
	Datum *result = eval(stmts);
	if(result)
		return result;
	else{
		Statement *s = stmts;
		while(s != nil){
			Statement *tmp = s;
			s = s->next;
			free(tmp->toks);
			free(tmp);
		}
		return nil;
	}
}