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fn ipow(a, b) { let r = 1; while (b > 0) { r *= a; b--; } return r; }
// a parse word that adds an operator to the compiler's tables
immediate fn pow_op() { next(); add_binop("**", 11, "ipow c"); return 0; }
pow_op
// unless (cond) stmt: a parse word that emits code itself
immediate fn unless() {
let a;
next();
expect(intern("(")); rval(); plainuse(expr()); rval(); expect(intern(")"));
emitseq(useq[0], ulen[0]); // not
a = hole(); op(O_JZ); // skip the body when the condition was true
substmt();
setlit(a, here);
return 0;
}
// repeat N { body }: a macro, built from token lists
immediate fn repeat() {
let n, body, i = 0;
next(); n = tv; next();
body = grab();
while (i < n) { feed(qdup(body)); i++; }
free(d*body);
return 0;
}
fn main() {
put_n(2 ** 10); put_c(' '); put_n(3 + 2 ** 3 * 2); put_c(10);
unless (1 > 2) put_s("unless ok\n");
unless (2 > 1) put_s("wrong\n");
repeat 3 { put_c('r'); }
put_c(10);
let q = quote { put_n(40 + 2); put_c(10); return 7; };
put_n(q[0]); put_c(' ');
put_n(eval(q)); put_c(10);
let f = compile(q);
put_n(f()); put_c(10);
free(d*q);
let defs = quote { fn sq(x) { return x * x; } };
load(defs);
free(d*defs);
put_n(evals("return sq(12);")); put_c(10);
return 0;
}
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