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namespace;
include rt, run;
// growing the language from inside a program, while it compiles
// x |> f calls f(x). on a stack machine that's just "call": the value is
// already on the stack, under f's address.
immediate fn pipe_op() { run.next(); run.add_binop("|>", 1, "c"); return 0; }
pipe_op
// unless (c) stmt
immediate fn unless() {
let a;
run.next(); run.expect(run.intern("(")); run.plainuse(run.expr()); run.rval(); run.expect(run.intern(")"));
run.emitseq(run.useq[0], run.ulen[0]); // not
a = run.hole(); run.op(run.O_JZ);
run.substmt();
run.setlit(a, run.here);
return 0;
}
// assert (c): the failure message carries the line it was written on
void assert_fail(int line) { rt.put_s("assertion failed on line "); rt.put_n(line); rt.put_c(10); rt.halt(); return; }
immediate fn assert() {
let a, l = run.tline;
run.next(); run.expect(run.intern("(")); run.plainuse(run.expr()); run.rval(); run.expect(run.intern(")"));
run.emitseq(run.useq[0], run.ulen[0]); // not: the jump below skips the failure when it holds
a = run.hole(); run.op(run.O_JZ);
run.lit(l); run.callname(run.intern("assert_fail")); run.op(run.O_DROP);
run.setlit(a, run.here);
return 0;
}
// times N { body }: the body pasted N times, at compile time
immediate fn times() {
let n, b, i = 0;
run.next(); n = run.tv; run.next();
b = run.grab();
while (i < n) { run.feed(run.qdup(b)); i++; }
rt.free(b);
return 0;
}
fn double(x) { return x * 2; }
fn inc(x) { return x + 1; }
void main() {
rt.put_n(5 |> double |> inc |> double); rt.put_c(10);
unless (1 > 2) rt.put_s("one isn't bigger than two\n");
times 3 { rt.put_c('*'); }
rt.put_c(10);
assert(double(4) == 8);
assert(inc(1) == 3);
return;
}
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