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node_modules/tstl/iterator/global.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.next = exports.prev = exports.advance = exports.distance = exports.size = exports.empty = void 0;
+var InvalidArgument_1 = require("../exception/InvalidArgument");
+/* =========================================================
+    GLOBAL FUNCTIONS
+        - ACCESSORS
+        - MOVERS
+        - FACTORIES
+============================================================
+    ACCESSORS
+--------------------------------------------------------- */
+/**
+ * Test whether a container is empty.
+ *
+ * @param source Target container.
+ * @return Whether empty or not.
+ */
+function empty(source) {
+    if (source instanceof Array)
+        return source.length !== 0;
+    else
+        return source.empty();
+}
+exports.empty = empty;
+/**
+ * Get number of elements of a container.
+ *
+ * @param source Target container.
+ * @return The number of elements in the container.
+ */
+function size(source) {
+    if (source instanceof Array)
+        return source.length;
+    else
+        return source.size();
+}
+exports.size = size;
+function distance(first, last) {
+    if (first.index instanceof Function)
+        return _Distance_via_index(first, last);
+    var ret = 0;
+    for (; !first.equals(last); first = first.next())
+        ++ret;
+    return ret;
+}
+exports.distance = distance;
+function _Distance_via_index(first, last) {
+    var x = first.index();
+    var y = last.index();
+    if (first.base instanceof Function)
+        return x - y;
+    else
+        return y - x;
+}
+function advance(it, n) {
+    if (n === 0)
+        return it;
+    else if (it.advance instanceof Function)
+        return it.advance(n);
+    var stepper;
+    if (n < 0) {
+        if (!(it.prev instanceof Function))
+            throw new InvalidArgument_1.InvalidArgument("Error on std.advance(): parametric iterator is not a bi-directional iterator, thus advancing to negative direction is not possible.");
+        stepper = function (it) { return it.prev(); };
+        n = -n;
+    }
+    else
+        stepper = function (it) { return it.next(); };
+    while (n-- > 0)
+        it = stepper(it);
+    return it;
+}
+exports.advance = advance;
+/**
+ * Get previous iterator.
+ *
+ * @param it Iterator to move.
+ * @param n Step to move prev.
+ * @return An iterator moved to prev *n* steps.
+ */
+function prev(it, n) {
+    if (n === void 0) { n = 1; }
+    if (n === 1)
+        return it.prev();
+    else
+        return advance(it, -n);
+}
+exports.prev = prev;
+/**
+ * Get next iterator.
+ *
+ * @param it Iterator to move.
+ * @param n Step to move next.
+ * @return Iterator moved to next *n* steps.
+ */
+function next(it, n) {
+    if (n === void 0) { n = 1; }
+    if (n === 1)
+        return it.next();
+    else
+        return advance(it, n);
+}
+exports.next = next;
+//# sourceMappingURL=global.js.map