55 lines
1.0 KiB
JavaScript
55 lines
1.0 KiB
JavaScript
import stripAnsi from 'strip-ansi';
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import eastAsianWidth from 'eastasianwidth';
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import emojiRegex from 'emoji-regex';
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export default function stringWidth(string, options = {}) {
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if (typeof string !== 'string' || string.length === 0) {
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return 0;
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}
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options = {
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ambiguousIsNarrow: true,
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...options
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};
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string = stripAnsi(string);
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if (string.length === 0) {
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return 0;
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}
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string = string.replace(emojiRegex(), ' ');
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const ambiguousCharacterWidth = options.ambiguousIsNarrow ? 1 : 2;
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let width = 0;
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for (const character of string) {
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const codePoint = character.codePointAt(0);
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// Ignore control characters
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if (codePoint <= 0x1F || (codePoint >= 0x7F && codePoint <= 0x9F)) {
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continue;
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}
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// Ignore combining characters
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if (codePoint >= 0x300 && codePoint <= 0x36F) {
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continue;
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}
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const code = eastAsianWidth.eastAsianWidth(character);
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switch (code) {
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case 'F':
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case 'W':
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width += 2;
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break;
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case 'A':
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width += ambiguousCharacterWidth;
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break;
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default:
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width += 1;
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}
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}
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return width;
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}
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