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1// Copyright 2015 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5export function anyToString(x: any): string {
6  return "" + x;
7}
8
9function computeScrollTop(container, element) {
10  const height = container.offsetHeight;
11  const margin = Math.floor(height / 4);
12  const pos = element.offsetTop;
13  const currentScrollTop = container.scrollTop;
14  if (pos < currentScrollTop + margin) {
15    return Math.max(0, pos - margin);
16  } else if (pos > (currentScrollTop + 3 * margin)) {
17    return Math.max(0, pos - 3 * margin);
18  }
19  return pos;
20}
21
22export class ViewElements {
23  container: HTMLElement;
24  scrollTop: number;
25
26  constructor(container: HTMLElement) {
27    this.container = container;
28    this.scrollTop = undefined;
29  }
30
31  consider(element, doConsider) {
32    if (!doConsider) return;
33    const newScrollTop = computeScrollTop(this.container, element);
34    if (isNaN(newScrollTop)) {
35      console.log("NOO");
36    }
37    if (this.scrollTop === undefined) {
38      this.scrollTop = newScrollTop;
39    } else {
40      this.scrollTop = Math.min(this.scrollTop, newScrollTop);
41    }
42  }
43
44  apply(doApply) {
45    if (!doApply || this.scrollTop === undefined) return;
46    this.container.scrollTop = this.scrollTop;
47  }
48}
49
50export function sortUnique<T>(arr: Array<T>, f: (a: T, b: T) => number, equal: (a: T, b: T) => boolean) {
51  if (arr.length == 0) return arr;
52  arr = arr.sort(f);
53  const ret = [arr[0]];
54  for (let i = 1; i < arr.length; i++) {
55    if (!equal(arr[i - 1], arr[i])) {
56      ret.push(arr[i]);
57    }
58  }
59  return ret;
60}
61
62// Partial application without binding the receiver
63export function partial(f: any, ...arguments1: Array<any>) {
64  return function (this: any, ...arguments2: Array<any>) {
65    f.apply(this, [...arguments1, ...arguments2]);
66  };
67}
68
69export function isIterable(obj: any): obj is Iterable<any> {
70  return obj != null && obj != undefined
71    && typeof obj != 'string' && typeof obj[Symbol.iterator] === 'function';
72}
73
74export function alignUp(raw: number, multiple: number): number {
75  return Math.floor((raw + multiple - 1) / multiple) * multiple;
76}
77
78export function measureText(text: string) {
79  const textMeasure = document.getElementById('text-measure');
80  if (textMeasure instanceof SVGTSpanElement) {
81    textMeasure.textContent = text;
82    return {
83      width: textMeasure.getBBox().width,
84      height: textMeasure.getBBox().height,
85    };
86  }
87  return { width: 0, height: 0 };
88}
89
90// Interpolate between the given start and end values by a fraction of val/max.
91export function interpolate(val: number, max: number, start: number, end: number) {
92  return start + (end - start) * (val / max);
93}
94
95export function createElement(tag: string, cls: string, content?: string) {
96  const el = document.createElement(tag);
97  el.className = cls;
98  if (content != undefined) el.innerText = content;
99  return el;
100}
101