36 lines
1.4 KiB
JavaScript
36 lines
1.4 KiB
JavaScript
"use strict";
|
|
Object.defineProperty(exports, "__esModule", { value: true });
|
|
exports.shrinkInteger = shrinkInteger;
|
|
const Value_1 = require("../../../check/arbitrary/definition/Value");
|
|
const Stream_1 = require("../../../stream/Stream");
|
|
const safeMathCeil = Math.ceil;
|
|
const safeMathFloor = Math.floor;
|
|
function halvePosInteger(n) {
|
|
return safeMathFloor(n / 2);
|
|
}
|
|
function halveNegInteger(n) {
|
|
return safeMathCeil(n / 2);
|
|
}
|
|
function shrinkInteger(current, target, tryTargetAsap) {
|
|
const realGap = current - target;
|
|
function* shrinkDecr() {
|
|
let previous = tryTargetAsap ? undefined : target;
|
|
const gap = tryTargetAsap ? realGap : halvePosInteger(realGap);
|
|
for (let toremove = gap; toremove > 0; toremove = halvePosInteger(toremove)) {
|
|
const next = toremove === realGap ? target : current - toremove;
|
|
yield new Value_1.Value(next, previous);
|
|
previous = next;
|
|
}
|
|
}
|
|
function* shrinkIncr() {
|
|
let previous = tryTargetAsap ? undefined : target;
|
|
const gap = tryTargetAsap ? realGap : halveNegInteger(realGap);
|
|
for (let toremove = gap; toremove < 0; toremove = halveNegInteger(toremove)) {
|
|
const next = toremove === realGap ? target : current - toremove;
|
|
yield new Value_1.Value(next, previous);
|
|
previous = next;
|
|
}
|
|
}
|
|
return realGap > 0 ? (0, Stream_1.stream)(shrinkDecr()) : (0, Stream_1.stream)(shrinkIncr());
|
|
}
|