jodit/src/modules/helpers/string/sprintf.ts

Jodit is awesome and usefully wysiwyg editor with filebrowser

/*!
 * Jodit Editor (https://xdsoft.net/jodit/)
 * Licensed under GNU General Public License version 2 or later or a commercial license or MIT;
 * For GPL see LICENSE-GPL.txt in the project root for license information.
 * For MIT see LICENSE-MIT.txt in the project root for license information.
 * For commercial licenses see https://xdsoft.net/jodit/commercial/
 * Copyright (c) 2013-2019 Valeriy Chupurnov. All rights reserved. https://xdsoft.net
 */

export const sprintf = (...args: Array<string | number>): string => {
	let i: number = 0;

	const
		regex: RegExp = /%%|%(\d+\$)?([-+#0 ]*)(\*\d+\$|\*|\d+)?(\.(\*\d+\$|\*|\d+))?([scboxXuidfegEG])/g,
		a: Array<string | number> = args,
		format: string = a[i] as string;

	i += 1;

	const pad = (
		str: string,
		len: number,
		chr: string,
		leftJustify: boolean
	): string => {
		const padding =
			str.length >= len
				? ''
				: Array((1 + len - str.length) >>> 0).join(chr);
		return leftJustify ? str + padding : padding + str;
	};

	// justify()
	const justify = (
		value: string,
		prefix: string,
		leftJustify: boolean,
		minWidth: number,
		zeroPad: boolean
	): string => {
		const diff: number = minWidth - value.length;

		if (diff > 0) {
			if (leftJustify || !zeroPad) {
				value = pad(value, minWidth, ' ', leftJustify);
			} else {
				value =
					value.slice(0, prefix.length) +
					pad('', diff, '0', true) +
					value.slice(prefix.length);
			}
		}

		return value;
	};

	const formatBaseX = (
		value: any,
		base: any,
		prefix: any,
		leftJustify: any,
		minWidth: number,
		precision: number,
		zeroPad: boolean
	) => {
		const number = value >>> 0;

		prefix =
			(prefix &&
				number &&
				({ 2: '0b', 8: '0', 16: '0x' } as any)[base]) ||
			'';
		const
			newValue: string = prefix + pad(number.toString(base), precision || 0, '0', false);

		return justify(newValue, prefix, leftJustify, minWidth, zeroPad);
	};

	const formatString = (
		value: string,
		leftJustify: boolean,
		minWidth: number,
		precision: number,
		zeroPad: any
	) => {
		if (precision != null) {
			value = value.slice(0, precision);
		}
		return justify(value, '', leftJustify, minWidth, zeroPad);
	};

	const doFormat = (
		substring: string,
		valueIndex: number,
		flags: string,
		minWidth: number | string,
		_: any,
		precision: any | undefined | string | string[],
		type: string
	) => {
		if (substring === '%%') {
			return '%';
		}

		let leftJustify: boolean = false,
			positivePrefix: string = '',
			zeroPad: boolean = false,
			prefixBaseX: boolean = false;

		for (let j = 0; flags && j < flags.length; j++) {
			switch (flags.charAt(j)) {
				case ' ':
					positivePrefix = ' ';
					break;
				case '+':
					positivePrefix = '+';
					break;
				case '-':
					leftJustify = true;
					break;
				case '0':
					zeroPad = true;
					break;
				case '#':
					prefixBaseX = true;
					break;
			}
		}

		if (!minWidth) {
			minWidth = 0;
		} else if (minWidth === '*') {
			minWidth = +a[i++];
		} else if (minWidth.toString().charAt(0) === '*') {
			minWidth = +(a as any)[minWidth.toString().slice(1, -1)];
		} else {
			minWidth = +minWidth;
		}

		// Note: undocumented perl feature:
		if (minWidth < 0) {
			minWidth = -minWidth;
			leftJustify = true;
		}

		if (!isFinite(minWidth)) {
			throw new Error('sprintf: (minimum-)width must be finite');
		}

		if (!precision) {
			precision =
				'fFeE'.indexOf(type) > -1 ? 6 : type === 'd' ? 0 : void 0;
		} else if (precision === '*') {
			precision = +a[i++];
		} else if ((precision as any)[0] === '*') {
			precision = +a[(precision as any).slice(1, -1)];
		} else {
			precision = +precision;
		}

		// grab value using valueIndex if required?
		let value: string | number = valueIndex
			? a[(valueIndex as any).slice(0, -1)]
			: a[i++];

		switch (type) {
			case 's':
				return formatString(
					String(value),
					leftJustify,
					minWidth,
					precision,
					zeroPad
				);
			case 'c':
				return formatString(
					String.fromCharCode(+value),
					leftJustify,
					minWidth,
					precision,
					zeroPad
				);
			case 'b':
				return formatBaseX(
					value,
					2,
					prefixBaseX,
					leftJustify,
					minWidth,
					precision,
					zeroPad
				);
			case 'o':
				return formatBaseX(
					value,
					8,
					prefixBaseX,
					leftJustify,
					minWidth,
					precision,
					zeroPad
				);
			case 'x':
				return formatBaseX(
					value,
					16,
					prefixBaseX,
					leftJustify,
					minWidth,
					precision,
					zeroPad
				);
			case 'X':
				return formatBaseX(
					value,
					16,
					prefixBaseX,
					leftJustify,
					minWidth,
					precision,
					zeroPad
				).toUpperCase();
			case 'u':
				return formatBaseX(
					value,
					10,
					prefixBaseX,
					leftJustify,
					minWidth,
					precision,
					zeroPad
				);
			case 'i':
			case 'd': {
				const number = parseInt(value.toString(), 10);
				const prefix = number < 0 ? '-' : positivePrefix;
				value =
					prefix +
					pad(String(Math.abs(number)), precision, '0', false);
				return justify(value, prefix, leftJustify, minWidth, zeroPad);
			}
			case 'e':
			case 'E':
			case 'f':
			case 'F':
			case 'g':
			case 'G': {
				const number = +value;
				const prefix = number < 0 ? '-' : positivePrefix;
				const method = ['toExponential', 'toFixed', 'toPrecision'][
					'efg'.indexOf(type.toLowerCase())
					];
				const textTransform = ['toString', 'toUpperCase'][
				'eEfFgG'.indexOf(type) % 2
					];
				value = prefix + (Math.abs(number) as any)[method](precision);
				return (justify(
					value,
					prefix,
					leftJustify,
					minWidth,
					zeroPad
				) as any)[textTransform]();
			}
			default:
				return substring;
		}
	};

	return format.replace(regex, doFormat);
};