@virtualstate/examples/lib/examples/experiments/combinational/not.js

import { Fragment, h } from "@virtualstate/fringe";
import { isTrue } from "./truth.js";
import { True, False } from "./truth.js";
export async function* Not(o, state) {
    // We have no child state, input is not true
    if (!state)
        return yield h(True, null);
    // We have a non fragment child, input is true
    if (state.reference !== Fragment) {
        if (isTrue(state)) {
            return;
        }
        else {
            return h(True, null);
        }
    }
    const children = state.children;
    // We have no fragment children, input is not true
    if (!children)
        return;
    let everYielded = false;
    for await (const result of children) {
        const not = !result.some(isTrue);
        if (not && !everYielded)
            continue;
        yield not ? h(True, null) : h(False, null);
        everYielded = true;
    }
    // If we yielded earlier, the final result is the matching result
    if (!everYielded) {
        yield h(True, null);
    }
}
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