main.c


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#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);
	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{
			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)
{
	int ntoks;
	Datum *tokens = lexline(line, &ntoks);
	Datum *result = eval(tokens, &ntoks);
	if(ntoks == 1)
		return result;
	else{
		free(tokens);
		return nil;
	}
}