mirror of
https://github.com/denoland/deno.git
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534 lines
14 KiB
TypeScript
534 lines
14 KiB
TypeScript
import {
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CallbackResult,
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Rule,
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TestFunction,
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TestResult,
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Tokenizer,
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} from "./tokenizer.ts";
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function digits(value: string | number, count = 2): string {
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return String(value).padStart(count, "0");
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}
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// as declared as in namespace Intl
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type DateTimeFormatPartTypes =
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| "day"
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| "dayPeriod"
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// | "era"
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| "hour"
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| "literal"
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| "minute"
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| "month"
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| "second"
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| "timeZoneName"
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// | "weekday"
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| "year"
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| "fractionalSecond";
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interface DateTimeFormatPart {
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type: DateTimeFormatPartTypes;
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value: string;
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}
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type TimeZone = "UTC";
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interface Options {
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timeZone?: TimeZone;
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}
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function createLiteralTestFunction(value: string): TestFunction {
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return (string: string): TestResult => {
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return string.startsWith(value)
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? { value, length: value.length }
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: undefined;
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};
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}
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function createMatchTestFunction(match: RegExp): TestFunction {
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return (string: string): TestResult => {
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const result = match.exec(string);
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if (result) return { value: result, length: result[0].length };
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};
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}
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// according to unicode symbols (http://userguide.icu-project.org/formatparse/datetime)
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const defaultRules = [
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{
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test: createLiteralTestFunction("yyyy"),
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fn: (): CallbackResult => ({ type: "year", value: "numeric" }),
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},
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{
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test: createLiteralTestFunction("yy"),
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fn: (): CallbackResult => ({ type: "year", value: "2-digit" }),
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},
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{
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test: createLiteralTestFunction("MM"),
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fn: (): CallbackResult => ({ type: "month", value: "2-digit" }),
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},
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{
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test: createLiteralTestFunction("M"),
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fn: (): CallbackResult => ({ type: "month", value: "numeric" }),
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},
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{
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test: createLiteralTestFunction("dd"),
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fn: (): CallbackResult => ({ type: "day", value: "2-digit" }),
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},
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{
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test: createLiteralTestFunction("d"),
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fn: (): CallbackResult => ({ type: "day", value: "numeric" }),
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},
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{
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test: createLiteralTestFunction("hh"),
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fn: (): CallbackResult => ({ type: "hour", value: "2-digit" }),
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},
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{
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test: createLiteralTestFunction("h"),
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fn: (): CallbackResult => ({ type: "hour", value: "numeric" }),
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},
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{
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test: createLiteralTestFunction("mm"),
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fn: (): CallbackResult => ({ type: "minute", value: "2-digit" }),
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},
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{
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test: createLiteralTestFunction("m"),
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fn: (): CallbackResult => ({ type: "minute", value: "numeric" }),
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},
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{
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test: createLiteralTestFunction("ss"),
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fn: (): CallbackResult => ({ type: "second", value: "2-digit" }),
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},
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{
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test: createLiteralTestFunction("s"),
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fn: (): CallbackResult => ({ type: "second", value: "numeric" }),
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},
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{
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test: createLiteralTestFunction("SSS"),
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fn: (): CallbackResult => ({ type: "fractionalSecond", value: 3 }),
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},
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{
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test: createLiteralTestFunction("SS"),
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fn: (): CallbackResult => ({ type: "fractionalSecond", value: 2 }),
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},
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{
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test: createLiteralTestFunction("S"),
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fn: (): CallbackResult => ({ type: "fractionalSecond", value: 1 }),
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},
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{
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test: createLiteralTestFunction("a"),
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fn: (value: unknown): CallbackResult => ({
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type: "dayPeriod",
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value: value as string,
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}),
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},
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// quoted literal
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{
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test: createMatchTestFunction(/^(')(?<value>\\.|[^\']*)\1/),
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fn: (match: unknown): CallbackResult => ({
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type: "literal",
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value: (match as RegExpExecArray).groups!.value as string,
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}),
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},
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// literal
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{
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test: createMatchTestFunction(/^.+?\s*/),
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fn: (match: unknown): CallbackResult => ({
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type: "literal",
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value: (match as RegExpExecArray)[0],
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}),
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},
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];
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type FormatPart = { type: DateTimeFormatPartTypes; value: string | number };
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type Format = FormatPart[];
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export class DateTimeFormatter {
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#format: Format;
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constructor(formatString: string, rules: Rule[] = defaultRules) {
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const tokenizer = new Tokenizer(rules);
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this.#format = tokenizer.tokenize(formatString, ({ type, value }) => ({
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type,
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value,
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})) as Format;
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}
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format(date: Date, options: Options = {}): string {
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let string = "";
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const utc = options.timeZone === "UTC";
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const hour12 = this.#format.find(
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(token: FormatPart) => token.type === "dayPeriod",
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);
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for (const token of this.#format) {
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const type = token.type;
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switch (type) {
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case "year": {
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const value = utc ? date.getUTCFullYear() : date.getFullYear();
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switch (token.value) {
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case "numeric": {
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string += value;
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break;
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}
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case "2-digit": {
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string += digits(value, 2).slice(-2);
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break;
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}
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default:
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throw Error(
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`FormatterError: value "${token.value}" is not supported`,
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);
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}
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break;
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}
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case "month": {
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const value = (utc ? date.getUTCMonth() : date.getMonth()) + 1;
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switch (token.value) {
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case "numeric": {
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string += value;
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break;
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}
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case "2-digit": {
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string += digits(value, 2);
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break;
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}
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default:
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throw Error(
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`FormatterError: value "${token.value}" is not supported`,
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);
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}
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break;
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}
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case "day": {
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const value = utc ? date.getUTCDate() : date.getDate();
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switch (token.value) {
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case "numeric": {
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string += value;
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break;
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}
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case "2-digit": {
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string += digits(value, 2);
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break;
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}
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default:
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throw Error(
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`FormatterError: value "${token.value}" is not supported`,
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);
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}
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break;
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}
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case "hour": {
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let value = utc ? date.getUTCHours() : date.getHours();
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value -= hour12 && date.getHours() > 12 ? 12 : 0;
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switch (token.value) {
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case "numeric": {
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string += value;
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break;
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}
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case "2-digit": {
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string += digits(value, 2);
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break;
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}
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default:
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throw Error(
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`FormatterError: value "${token.value}" is not supported`,
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);
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}
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break;
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}
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case "minute": {
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const value = utc ? date.getUTCMinutes() : date.getMinutes();
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switch (token.value) {
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case "numeric": {
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string += value;
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break;
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}
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case "2-digit": {
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string += digits(value, 2);
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break;
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}
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default:
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throw Error(
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`FormatterError: value "${token.value}" is not supported`,
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);
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}
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break;
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}
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case "second": {
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const value = utc ? date.getUTCSeconds() : date.getSeconds();
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switch (token.value) {
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case "numeric": {
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string += value;
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break;
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}
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case "2-digit": {
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string += digits(value, 2);
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break;
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}
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default:
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throw Error(
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`FormatterError: value "${token.value}" is not supported`,
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);
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}
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break;
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}
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case "fractionalSecond": {
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const value = utc
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? date.getUTCMilliseconds()
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: date.getMilliseconds();
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string += digits(value, Number(token.value));
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break;
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}
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case "timeZoneName": {
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// string += utc ? "Z" : token.value
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// break
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}
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case "dayPeriod": {
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string += hour12 ? (date.getHours() >= 12 ? "PM" : "AM") : "";
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break;
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}
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case "literal": {
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string += token.value;
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break;
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}
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default:
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throw Error(`FormatterError: { ${token.type} ${token.value} }`);
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}
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}
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return string;
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}
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parseToParts(string: string): DateTimeFormatPart[] {
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const parts: DateTimeFormatPart[] = [];
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for (const token of this.#format) {
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const type = token.type;
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let value = "";
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switch (token.type) {
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case "year": {
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switch (token.value) {
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case "numeric": {
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value = /^\d{1,4}/.exec(string)?.[0] as string;
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break;
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}
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case "2-digit": {
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value = /^\d{1,2}/.exec(string)?.[0] as string;
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break;
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}
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}
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break;
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}
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case "month": {
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switch (token.value) {
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case "numeric": {
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value = /^\d{1,2}/.exec(string)?.[0] as string;
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break;
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}
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case "2-digit": {
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value = /^\d{2}/.exec(string)?.[0] as string;
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break;
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}
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case "narrow": {
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value = /^[a-zA-Z]+/.exec(string)?.[0] as string;
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break;
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}
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case "short": {
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value = /^[a-zA-Z]+/.exec(string)?.[0] as string;
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break;
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}
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case "long": {
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value = /^[a-zA-Z]+/.exec(string)?.[0] as string;
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break;
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}
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default:
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throw Error(
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`ParserError: value "${token.value}" is not supported`,
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);
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}
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break;
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}
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case "day": {
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switch (token.value) {
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case "numeric": {
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value = /^\d{1,2}/.exec(string)?.[0] as string;
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break;
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}
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case "2-digit": {
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value = /^\d{2}/.exec(string)?.[0] as string;
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break;
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}
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default:
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throw Error(
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`ParserError: value "${token.value}" is not supported`,
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);
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}
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break;
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}
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case "hour": {
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switch (token.value) {
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case "numeric": {
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value = /^\d{1,2}/.exec(string)?.[0] as string;
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break;
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}
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case "2-digit": {
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value = /^\d{2}/.exec(string)?.[0] as string;
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break;
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}
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default:
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throw Error(
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`ParserError: value "${token.value}" is not supported`,
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);
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}
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break;
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}
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case "minute": {
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switch (token.value) {
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case "numeric": {
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value = /^\d{1,2}/.exec(string)?.[0] as string;
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break;
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}
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case "2-digit": {
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value = /^\d{2}/.exec(string)?.[0] as string;
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break;
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}
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default:
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throw Error(
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`ParserError: value "${token.value}" is not supported`,
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);
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}
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break;
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}
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case "second": {
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switch (token.value) {
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case "numeric": {
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value = /^\d{1,2}/.exec(string)?.[0] as string;
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break;
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}
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case "2-digit": {
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value = /^\d{2}/.exec(string)?.[0] as string;
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break;
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}
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default:
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throw Error(
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`ParserError: value "${token.value}" is not supported`,
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);
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}
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break;
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}
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case "fractionalSecond": {
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value = new RegExp(`^\\d{${token.value}}`).exec(
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string,
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)?.[0] as string;
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break;
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}
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case "timeZoneName": {
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value = token.value as string;
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break;
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}
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case "dayPeriod": {
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value = /^(A|P)M/.exec(string)?.[0] as string;
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break;
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}
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case "literal": {
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if (!string.startsWith(token.value as string)) {
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throw Error(
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`Literal "${token.value}" not found "${string.slice(0, 25)}"`,
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);
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}
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value = token.value as string;
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break;
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}
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default:
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throw Error(`${token.type} ${token.value}`);
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}
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if (!value) {
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throw Error(
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`value not valid for token { ${type} ${value} } ${
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string.slice(
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0,
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25,
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)
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}`,
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);
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}
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parts.push({ type, value });
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string = string.slice(value.length);
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}
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if (string.length) {
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throw Error(
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`datetime string was not fully parsed! ${string.slice(0, 25)}`,
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);
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}
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return parts;
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}
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partsToDate(parts: DateTimeFormatPart[]): Date {
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const date = new Date();
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const utc = parts.find(
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(part) => part.type === "timeZoneName" && part.value === "UTC",
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);
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utc ? date.setUTCHours(0, 0, 0, 0) : date.setHours(0, 0, 0, 0);
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for (const part of parts) {
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switch (part.type) {
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case "year": {
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const value = Number(part.value.padStart(4, "20"));
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utc ? date.setUTCFullYear(value) : date.setFullYear(value);
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break;
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}
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case "month": {
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const value = Number(part.value) - 1;
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utc ? date.setUTCMonth(value) : date.setMonth(value);
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break;
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}
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case "day": {
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const value = Number(part.value);
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utc ? date.setUTCDate(value) : date.setDate(value);
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break;
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}
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case "hour": {
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let value = Number(part.value);
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const dayPeriod = parts.find(
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(part: DateTimeFormatPart) => part.type === "dayPeriod",
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);
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if (dayPeriod?.value === "PM") value += 12;
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utc ? date.setUTCHours(value) : date.setHours(value);
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break;
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}
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case "minute": {
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const value = Number(part.value);
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utc ? date.setUTCMinutes(value) : date.setMinutes(value);
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break;
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}
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case "second": {
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const value = Number(part.value);
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utc ? date.setUTCSeconds(value) : date.setSeconds(value);
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break;
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}
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case "fractionalSecond": {
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const value = Number(part.value);
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utc ? date.setUTCMilliseconds(value) : date.setMilliseconds(value);
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break;
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}
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}
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}
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return date;
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}
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parse(string: string): Date {
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const parts = this.parseToParts(string);
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return this.partsToDate(parts);
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}
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}
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