Initial commit

node_modules/fast-check/lib/arbitrary/_internals/helpers/ShrinkInteger.js

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+"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());
+}