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50 lines
1.7 KiB
50 lines
1.7 KiB
/* eslint-disable yoda */ |
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'use strict'; |
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const isFullwidthCodePoint = codePoint => { |
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if (Number.isNaN(codePoint)) { |
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return false; |
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} |
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// Code points are derived from: |
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// http://www.unix.org/Public/UNIDATA/EastAsianWidth.txt |
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if ( |
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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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return true; |
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} |
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return false; |
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}; |
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module.exports = isFullwidthCodePoint; |
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module.exports.default = isFullwidthCodePoint;
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