41 lines
1.6 KiB
JavaScript
41 lines
1.6 KiB
JavaScript
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/* eslint-disable yoda */
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export default function isFullwidthCodePoint(codePoint) {
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if (!Number.isInteger(codePoint)) {
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return false;
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}
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// Code points are derived from:
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// https://unicode.org/Public/UNIDATA/EastAsianWidth.txt
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return codePoint >= 0x1100 && (
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codePoint <= 0x115F || // Hangul Jamo
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codePoint === 0x2329 || // LEFT-POINTING ANGLE BRACKET
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codePoint === 0x232A || // RIGHT-POINTING ANGLE BRACKET
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// CJK Radicals Supplement .. Enclosed CJK Letters and Months
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(0x2E80 <= codePoint && codePoint <= 0x3247 && codePoint !== 0x303F) ||
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// Enclosed CJK Letters and Months .. CJK Unified Ideographs Extension A
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(0x3250 <= codePoint && codePoint <= 0x4DBF) ||
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// CJK Unified Ideographs .. Yi Radicals
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(0x4E00 <= codePoint && codePoint <= 0xA4C6) ||
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// Hangul Jamo Extended-A
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(0xA960 <= codePoint && codePoint <= 0xA97C) ||
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// Hangul Syllables
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(0xAC00 <= codePoint && codePoint <= 0xD7A3) ||
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// CJK Compatibility Ideographs
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(0xF900 <= codePoint && codePoint <= 0xFAFF) ||
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// Vertical Forms
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(0xFE10 <= codePoint && codePoint <= 0xFE19) ||
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// CJK Compatibility Forms .. Small Form Variants
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(0xFE30 <= codePoint && codePoint <= 0xFE6B) ||
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// Halfwidth and Fullwidth Forms
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(0xFF01 <= codePoint && codePoint <= 0xFF60) ||
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(0xFFE0 <= codePoint && codePoint <= 0xFFE6) ||
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// Kana Supplement
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(0x1B000 <= codePoint && codePoint <= 0x1B001) ||
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// Enclosed Ideographic Supplement
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(0x1F200 <= codePoint && codePoint <= 0x1F251) ||
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// CJK Unified Ideographs Extension B .. Tertiary Ideographic Plane
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(0x20000 <= codePoint && codePoint <= 0x3FFFD)
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);
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}
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