From 7949fcdc683d07689bad5da5d20bfa3eeb5a6a46 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= Date: Tue, 5 Sep 2023 01:25:00 +0200 Subject: Move frontend code to subdirectories, to simplify command line flags. --- static/ts/lib.ts | 233 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 233 insertions(+) create mode 100644 static/ts/lib.ts (limited to 'static/ts/lib.ts') diff --git a/static/ts/lib.ts b/static/ts/lib.ts new file mode 100644 index 00000000..2ef5b596 --- /dev/null +++ b/static/ts/lib.ts @@ -0,0 +1,233 @@ +export { + makeElement, date_to_percent, + parseDate, gensym, to_local, to_boolean, + asList, round_time +} + +/* + General procedures which in theory could be used anywhere. + */ + +/* + * https://www.typescriptlang.org/docs/handbook/declaration-merging.html + */ +declare global { + interface Object { + format: (fmt: string) => string + } + + interface HTMLElement { + _addEventListener: (name: string, proc: (e: Event) => void) => void + listeners: Map void)[]> + getListeners: () => Map void)[]> + } + + interface Date { + format: (fmt: string) => string + utc: boolean + dateonly: boolean + // type: 'date' | 'date-time' + } + + interface DOMTokenList { + find: (regex: string) => [number, string] | undefined + } + + interface HTMLCollection { + forEach: (proc: ((el: Element) => void)) => void + } + + interface HTMLCollectionOf { + forEach: (proc: ((el: T) => void)) => void + } +} + +HTMLElement.prototype._addEventListener = HTMLElement.prototype.addEventListener; +HTMLElement.prototype.addEventListener = function(name: string, proc: (e: Event) => void) { + if (!this.listeners) this.listeners = new Map + if (!this.listeners.get(name)) this.listeners.set(name, []); + /* Force since we ensure a value just above */ + this.listeners.get(name)!.push(proc); + return this._addEventListener(name, proc); +}; +HTMLElement.prototype.getListeners = function() { + return this.listeners; +} + + +/* ----- Date Extensions ---------------------------- */ + +/* + Extensions to Javascript's Date to allow representing times + with different timezones. Currently only UTC and local time + are supported, but more should be able to be added. + + NOTE that only the raw `get' (and NOT the `getUTC') methods + should be used on these objects, and that the reported timezone + is quite often wrong. + + TODO The years between 0 and 100 (inclusive) gives dates in the twentieth + century, due to how javascript works (...). + */ + +function parseDate(str: string): Date { + let year: number; + let month: number; + let day: number; + let hour: number | false = false; + let minute: number = 0; + let second: number = 0; + let utc: boolean = false; + + let end = str.length - 1; + if (str[end] == 'Z') { + utc = true; + str = str.substring(0, end); + }; + + switch (str.length) { + case '2020-01-01T13:37:00'.length: + second = +str.substr(17, 2); + case '2020-01-01T13:37'.length: + hour = +str.substr(11, 2); + minute = +str.substr(14, 2); + case '2020-01-01'.length: + year = +str.substr(0, 4); + month = +str.substr(5, 2) - 1; + day = +str.substr(8, 2); + break; + default: + throw `"${str}" doesn't look like a date/-time string` + } + + let date; + if (hour) { + date = new Date(year, month, day, hour, minute, second); + date.utc = utc; + date.dateonly = false; + } else { + date = new Date(year, month, day); + date.dateonly = true; + } + return date; +} + +function to_local(date: Date): Date { + if (!date.utc) return date; + + return new Date(date.getTime() - date.getTimezoneOffset() * 60 * 1000); +} + +/* -------------------------------------------------- */ + +function makeElement(name: string, attr = {}, actualAttr = {}): HTMLElement { + let element: HTMLElement = document.createElement(name); + for (let [key, value] of Object.entries(attr)) { + (element as any)[key] = value; + } + for (let [key, value] of Object.entries(actualAttr)) { + element.setAttribute(key, '' + value); + } + return element; +} + +function round_time(time: number, fraction: number): number { + let scale = 1 / fraction; + return Math.round(time * scale) / scale; +} + +/* only used by the bar. + Events use the start and end time of their container, but since the bar + is moving between containers that is clumsy. + Just doing (new Date()/(86400*1000)) would be nice, but there's no good + way to get the time in the current day. + */ +function date_to_percent(date: Date): number /* in 0, 100 */ { + return (date.getHours() + (date.getMinutes() / 60)) * 100 / 24; +} + +/* if only there was such a thing as a let to wrap around my lambda... */ +/* js infix to not collide with stuff generated backend */ +const gensym = (counter => (prefix = "gensym") => prefix + "js" + ++counter)(0) + +function asList(thing: Array | T): Array { + if (thing instanceof Array) { + return thing; + } else { + return [thing]; + } +} + + +function to_boolean(value: any): boolean { + switch (typeof value) { + case 'string': + switch (value) { + case 'true': return true; + case 'false': return false; + case '': return false; + default: return true; + } + case 'boolean': + return value; + default: + return !!value; + } +} + + + +/* internal */ +function datepad(thing: number | string, width = 2): string { + return (thing + "").padStart(width, "0"); +} + +function format_date(date: Date, str: string): string { + let fmtmode = false; + let outstr = ""; + for (var i = 0; i < str.length; i++) { + if (fmtmode) { + switch (str[i]) { + /* Moves the date into local time. */ + case 'L': date = to_local(date); break; + case 'Y': outstr += datepad(date.getFullYear(), 4); break; + case 'm': outstr += datepad(date.getMonth() + 1); break; + case 'd': outstr += datepad(date.getDate()); break; + case 'H': outstr += datepad(date.getHours()); break; + case 'M': outstr += datepad(date.getMinutes()); break; + case 'S': outstr += datepad(date.getSeconds()); break; + case 'Z': if (date.utc) outstr += 'Z'; break; + } + fmtmode = false; + } else if (str[i] == '~') { + fmtmode = true; + } else { + outstr += str[i]; + } + } + return outstr; +} + +Object.prototype.format = function(/* any number of arguments */) { return "" + this; } +Date.prototype.format = function(str) { return format_date(this, str); } + +/* + * Finds the first element of the DOMTokenList whichs value matches + * the supplied regexp. Returns a pair of the index and the value. + */ +DOMTokenList.prototype.find = function(regexp) { + let entries = this.entries(); + let entry; + while (!(entry = entries.next()).done) { + if (entry.value[1].match(regexp)) { + return entry.value; + } + } +} + +/* HTMLCollection is the result of a querySelectorAll */ +HTMLCollection.prototype.forEach = function(proc) { + for (let el of this) { + proc(el); + } +} -- cgit v1.2.3