// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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export function anyToString(x: any): string {
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return "" + x;
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}
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function computeScrollTop(container, element) {
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const height = container.offsetHeight;
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const margin = Math.floor(height / 4);
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const pos = element.offsetTop;
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const currentScrollTop = container.scrollTop;
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if (pos < currentScrollTop + margin) {
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return Math.max(0, pos - margin);
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} else if (pos > (currentScrollTop + 3 * margin)) {
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return Math.max(0, pos - 3 * margin);
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}
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return pos;
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}
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export class ViewElements {
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container: HTMLElement;
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scrollTop: number;
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constructor(container: HTMLElement) {
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this.container = container;
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this.scrollTop = undefined;
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}
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consider(element, doConsider) {
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if (!doConsider) return;
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const newScrollTop = computeScrollTop(this.container, element);
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if (isNaN(newScrollTop)) {
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console.log("NOO")
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}
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if (this.scrollTop === undefined) {
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this.scrollTop = newScrollTop;
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} else {
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this.scrollTop = Math.min(this.scrollTop, newScrollTop);
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}
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}
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apply(doApply) {
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if (!doApply || this.scrollTop === undefined) return;
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this.container.scrollTop = this.scrollTop;
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}
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}
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function lowerBound(a, value, compare, lookup) {
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let first = 0;
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let count = a.length;
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while (count > 0) {
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let step = Math.floor(count / 2);
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let middle = first + step;
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let middle_value = (lookup === undefined) ? a[middle] : lookup(a, middle);
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let result = (compare === undefined) ? (middle_value < value) : compare(middle_value, value);
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if (result) {
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first = middle + 1;
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count -= step + 1;
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} else {
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count = step;
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}
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}
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return first;
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}
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function upperBound(a, value, compare, lookup) {
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let first = 0;
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let count = a.length;
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while (count > 0) {
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let step = Math.floor(count / 2);
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let middle = first + step;
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let middle_value = (lookup === undefined) ? a[middle] : lookup(a, middle);
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let result = (compare === undefined) ? (value < middle_value) : compare(value, middle_value);
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if (!result) {
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first = middle + 1;
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count -= step + 1;
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} else {
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count = step;
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}
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}
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return first;
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}
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export function sortUnique<T>(arr: Array<T>, f: (a: T, b: T) => number, equal: (a: T, b: T) => boolean) {
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if (arr.length == 0) return arr;
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arr = arr.sort(f);
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let ret = [arr[0]];
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for (var i = 1; i < arr.length; i++) {
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if (!equal(arr[i - 1], arr[i])) {
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ret.push(arr[i]);
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}
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}
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return ret;
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}
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// Partial application without binding the receiver
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export function partial(f, ...arguments1) {
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return function (...arguments2) {
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var arguments2 = Array.from(arguments);
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f.apply(this, [...arguments1, ...arguments2]);
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}
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}
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export function isIterable(obj: any): obj is Iterable<any> {
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return obj != null && obj != undefined
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&& typeof obj != 'string' && typeof obj[Symbol.iterator] === 'function';
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}
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export function alignUp(raw:number, multiple:number):number {
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return Math.floor((raw + multiple - 1) / multiple) * multiple;
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}
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