83 lines
2.2 KiB
JavaScript
83 lines
2.2 KiB
JavaScript
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import stripAnsi from 'strip-ansi';
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import {eastAsianWidth} from 'get-east-asian-width';
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import emojiRegex from 'emoji-regex';
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const segmenter = new Intl.Segmenter();
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const defaultIgnorableCodePointRegex = /^\p{Default_Ignorable_Code_Point}$/u;
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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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const {
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ambiguousIsNarrow = true,
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countAnsiEscapeCodes = false,
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} = options;
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if (!countAnsiEscapeCodes) {
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string = stripAnsi(string);
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}
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if (string.length === 0) {
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return 0;
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}
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let width = 0;
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const eastAsianWidthOptions = {ambiguousAsWide: !ambiguousIsNarrow};
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for (const {segment: character} of segmenter.segment(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 zero-width characters
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if (
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(codePoint >= 0x20_0B && codePoint <= 0x20_0F) // Zero-width space, non-joiner, joiner, left-to-right mark, right-to-left mark
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|| codePoint === 0xFE_FF // Zero-width no-break space
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) {
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continue;
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}
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// Ignore combining characters
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if (
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(codePoint >= 0x3_00 && codePoint <= 0x3_6F) // Combining diacritical marks
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|| (codePoint >= 0x1A_B0 && codePoint <= 0x1A_FF) // Combining diacritical marks extended
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|| (codePoint >= 0x1D_C0 && codePoint <= 0x1D_FF) // Combining diacritical marks supplement
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|| (codePoint >= 0x20_D0 && codePoint <= 0x20_FF) // Combining diacritical marks for symbols
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|| (codePoint >= 0xFE_20 && codePoint <= 0xFE_2F) // Combining half marks
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) {
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continue;
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}
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// Ignore surrogate pairs
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if (codePoint >= 0xD8_00 && codePoint <= 0xDF_FF) {
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continue;
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}
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// Ignore variation selectors
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if (codePoint >= 0xFE_00 && codePoint <= 0xFE_0F) {
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continue;
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}
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// This covers some of the above cases, but we still keep them for performance reasons.
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if (defaultIgnorableCodePointRegex.test(character)) {
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continue;
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}
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// TODO: Use `/\p{RGI_Emoji}/v` when targeting Node.js 20.
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if (emojiRegex().test(character)) {
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width += 2;
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continue;
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}
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width += eastAsianWidth(codePoint, eastAsianWidthOptions);
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}
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return width;
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}
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