48 lines
932 B
TypeScript
48 lines
932 B
TypeScript
// Copyright 2022 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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const WHITESPACE = new Set([
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' ',
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'\u200E', // left-to-right mark
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'\u200F', // right-to-left mark
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'\u2007', // figure space
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'\u200B', // zero-width space
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'\u2800', // braille blank
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]);
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export function trim(str: string): string {
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let start = 0;
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let end = str.length - 1;
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for (start; start < str.length; start += 1) {
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const char = str[start];
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if (!WHITESPACE.has(char)) {
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break;
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}
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}
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for (end; end > 0; end -= 1) {
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const char = str[end];
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if (!WHITESPACE.has(char)) {
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break;
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}
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}
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if (start > 0 || end < str.length - 1) {
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return str.substring(start, end + 1);
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}
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return str;
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}
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export function isWhitespace(str: string): boolean {
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for (let i = 0; i < str.length; i += 1) {
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const char = str[i];
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if (!WHITESPACE.has(char)) {
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return false;
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}
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}
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return true;
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}
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