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neo-blessed/lib/unicode.js

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This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/**
* unicode.js - east asian width and surrogate pairs
* Copyright (c) 2013-2015, Christopher Jeffrey and contributors (MIT License).
* https://github.com/chjj/blessed
* Borrowed from vangie/east-asian-width, komagata/eastasianwidth,
* and mathiasbynens/String.prototype.codePointAt. Licenses below.
*/
// east-asian-width
//
// Copyright (c) 2015 Vangie Du
// https://github.com/vangie/east-asian-width
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
// eastasianwidth
//
// Copyright (c) 2013, Masaki Komagata
// https://github.com/komagata/eastasianwidth
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// String.prototype.codePointAt
//
// Copyright Mathias Bynens <https://mathiasbynens.be/>
// https://github.com/mathiasbynens/String.prototype.codePointAt
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// String.fromCodePoint
//
// Copyright Mathias Bynens <https://mathiasbynens.be/>
// https://github.com/mathiasbynens/String.fromCodePoint
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
var stringFromCharCode = String.fromCharCode;
var floor = Math.floor;
exports.charWidth = function(str, i) {
var point = typeof str !== 'number'
? exports.codePointAt(str, i || 0)
: str;
// nul
if (point === 0) return 0;
// search table of non-spacing characters
// is ucs combining or C0/C1 control character
if (exports.combining[point]) {
return 0;
}
// check for double-wide
// if (point >= 0x1100
// && (point <= 0x115f // Hangul Jamo init. consonants
// || point == 0x2329 || point == 0x232a
// || (point >= 0x2e80 && point <= 0xa4cf
// && point != 0x303f) // CJK ... Yi
// || (point >= 0xac00 && point <= 0xd7a3) // Hangul Syllables
// || (point >= 0xf900 && point <= 0xfaff) // CJK Compatibility Ideographs
// || (point >= 0xfe10 && point <= 0xfe19) // Vertical forms
// || (point >= 0xfe30 && point <= 0xfe6f) // CJK Compatibility Forms
// || (point >= 0xff00 && point <= 0xff60) // Fullwidth Forms
// || (point >= 0xffe0 && point <= 0xffe6)
// || (point >= 0x20000 && point <= 0x2fffd)
// || (point >= 0x30000 && point <= 0x3fffd))) {
// return 2;
// }
// check for double-wide
if ((0x3000 == point)
|| (0xFF01 <= point && point <= 0xFF60)
|| (0xFFE0 <= point && point <= 0xFFE6)) {
return 2;
}
if ((0x1100 <= point && point <= 0x115F)
|| (0x11A3 <= point && point <= 0x11A7)
|| (0x11FA <= point && point <= 0x11FF)
|| (0x2329 <= point && point <= 0x232A)
|| (0x2E80 <= point && point <= 0x2E99)
|| (0x2E9B <= point && point <= 0x2EF3)
|| (0x2F00 <= point && point <= 0x2FD5)
|| (0x2FF0 <= point && point <= 0x2FFB)
|| (0x3001 <= point && point <= 0x303E)
|| (0x3041 <= point && point <= 0x3096)
|| (0x3099 <= point && point <= 0x30FF)
|| (0x3105 <= point && point <= 0x312D)
|| (0x3131 <= point && point <= 0x318E)
|| (0x3190 <= point && point <= 0x31BA)
|| (0x31C0 <= point && point <= 0x31E3)
|| (0x31F0 <= point && point <= 0x321E)
|| (0x3220 <= point && point <= 0x3247)
|| (0x3250 <= point && point <= 0x32FE)
|| (0x3300 <= point && point <= 0x4DBF)
|| (0x4E00 <= point && point <= 0xA48C)
|| (0xA490 <= point && point <= 0xA4C6)
|| (0xA960 <= point && point <= 0xA97C)
|| (0xAC00 <= point && point <= 0xD7A3)
|| (0xD7B0 <= point && point <= 0xD7C6)
|| (0xD7CB <= point && point <= 0xD7FB)
|| (0xF900 <= point && point <= 0xFAFF)
|| (0xFE10 <= point && point <= 0xFE19)
|| (0xFE30 <= point && point <= 0xFE52)
|| (0xFE54 <= point && point <= 0xFE66)
|| (0xFE68 <= point && point <= 0xFE6B)
|| (0x1B000 <= point && point <= 0x1B001)
|| (0x1F200 <= point && point <= 0x1F202)
|| (0x1F210 <= point && point <= 0x1F23A)
|| (0x1F240 <= point && point <= 0x1F248)
|| (0x1F250 <= point && point <= 0x1F251)
|| (0x20000 <= point && point <= 0x2F73F)
|| (0x2B740 <= point && point <= 0x2FFFD)
|| (0x30000 <= point && point <= 0x3FFFD)) {
return 2;
}
/*
if ((0x00A1 == point)
|| (0x00A4 == point)
|| (0x00A7 <= point && point <= 0x00A8)
|| (0x00AA == point)
|| (0x00AD <= point && point <= 0x00AE)
|| (0x00B0 <= point && point <= 0x00B4)
|| (0x00B6 <= point && point <= 0x00BA)
|| (0x00BC <= point && point <= 0x00BF)
|| (0x00C6 == point)
|| (0x00D0 == point)
|| (0x00D7 <= point && point <= 0x00D8)
|| (0x00DE <= point && point <= 0x00E1)
|| (0x00E6 == point)
|| (0x00E8 <= point && point <= 0x00EA)
|| (0x00EC <= point && point <= 0x00ED)
|| (0x00F0 == point)
|| (0x00F2 <= point && point <= 0x00F3)
|| (0x00F7 <= point && point <= 0x00FA)
|| (0x00FC == point)
|| (0x00FE == point)
|| (0x0101 == point)
|| (0x0111 == point)
|| (0x0113 == point)
|| (0x011B == point)
|| (0x0126 <= point && point <= 0x0127)
|| (0x012B == point)
|| (0x0131 <= point && point <= 0x0133)
|| (0x0138 == point)
|| (0x013F <= point && point <= 0x0142)
|| (0x0144 == point)
|| (0x0148 <= point && point <= 0x014B)
|| (0x014D == point)
|| (0x0152 <= point && point <= 0x0153)
|| (0x0166 <= point && point <= 0x0167)
|| (0x016B == point)
|| (0x01CE == point)
|| (0x01D0 == point)
|| (0x01D2 == point)
|| (0x01D4 == point)
|| (0x01D6 == point)
|| (0x01D8 == point)
|| (0x01DA == point)
|| (0x01DC == point)
|| (0x0251 == point)
|| (0x0261 == point)
|| (0x02C4 == point)
|| (0x02C7 == point)
|| (0x02C9 <= point && point <= 0x02CB)
|| (0x02CD == point)
|| (0x02D0 == point)
|| (0x02D8 <= point && point <= 0x02DB)
|| (0x02DD == point)
|| (0x02DF == point)
|| (0x0300 <= point && point <= 0x036F)
|| (0x0391 <= point && point <= 0x03A1)
|| (0x03A3 <= point && point <= 0x03A9)
|| (0x03B1 <= point && point <= 0x03C1)
|| (0x03C3 <= point && point <= 0x03C9)
|| (0x0401 == point)
|| (0x0410 <= point && point <= 0x044F)
|| (0x0451 == point)
|| (0x2010 == point)
|| (0x2013 <= point && point <= 0x2016)
|| (0x2018 <= point && point <= 0x2019)
|| (0x201C <= point && point <= 0x201D)
|| (0x2020 <= point && point <= 0x2022)
|| (0x2024 <= point && point <= 0x2027)
|| (0x2030 == point)
|| (0x2032 <= point && point <= 0x2033)
|| (0x2035 == point)
|| (0x203B == point)
|| (0x203E == point)
|| (0x2074 == point)
|| (0x207F == point)
|| (0x2081 <= point && point <= 0x2084)
|| (0x20AC == point)
|| (0x2103 == point)
|| (0x2105 == point)
|| (0x2109 == point)
|| (0x2113 == point)
|| (0x2116 == point)
|| (0x2121 <= point && point <= 0x2122)
|| (0x2126 == point)
|| (0x212B == point)
|| (0x2153 <= point && point <= 0x2154)
|| (0x215B <= point && point <= 0x215E)
|| (0x2160 <= point && point <= 0x216B)
|| (0x2170 <= point && point <= 0x2179)
|| (0x2189 == point)
|| (0x2190 <= point && point <= 0x2199)
|| (0x21B8 <= point && point <= 0x21B9)
|| (0x21D2 == point)
|| (0x21D4 == point)
|| (0x21E7 == point)
|| (0x2200 == point)
|| (0x2202 <= point && point <= 0x2203)
|| (0x2207 <= point && point <= 0x2208)
|| (0x220B == point)
|| (0x220F == point)
|| (0x2211 == point)
|| (0x2215 == point)
|| (0x221A == point)
|| (0x221D <= point && point <= 0x2220)
|| (0x2223 == point)
|| (0x2225 == point)
|| (0x2227 <= point && point <= 0x222C)
|| (0x222E == point)
|| (0x2234 <= point && point <= 0x2237)
|| (0x223C <= point && point <= 0x223D)
|| (0x2248 == point)
|| (0x224C == point)
|| (0x2252 == point)
|| (0x2260 <= point && point <= 0x2261)
|| (0x2264 <= point && point <= 0x2267)
|| (0x226A <= point && point <= 0x226B)
|| (0x226E <= point && point <= 0x226F)
|| (0x2282 <= point && point <= 0x2283)
|| (0x2286 <= point && point <= 0x2287)
|| (0x2295 == point)
|| (0x2299 == point)
|| (0x22A5 == point)
|| (0x22BF == point)
|| (0x2312 == point)
|| (0x2460 <= point && point <= 0x24E9)
|| (0x24EB <= point && point <= 0x254B)
|| (0x2550 <= point && point <= 0x2573)
|| (0x2580 <= point && point <= 0x258F)
|| (0x2592 <= point && point <= 0x2595)
|| (0x25A0 <= point && point <= 0x25A1)
|| (0x25A3 <= point && point <= 0x25A9)
|| (0x25B2 <= point && point <= 0x25B3)
|| (0x25B6 <= point && point <= 0x25B7)
|| (0x25BC <= point && point <= 0x25BD)
|| (0x25C0 <= point && point <= 0x25C1)
|| (0x25C6 <= point && point <= 0x25C8)
|| (0x25CB == point)
|| (0x25CE <= point && point <= 0x25D1)
|| (0x25E2 <= point && point <= 0x25E5)
|| (0x25EF == point)
|| (0x2605 <= point && point <= 0x2606)
|| (0x2609 == point)
|| (0x260E <= point && point <= 0x260F)
|| (0x2614 <= point && point <= 0x2615)
|| (0x261C == point)
|| (0x261E == point)
|| (0x2640 == point)
|| (0x2642 == point)
|| (0x2660 <= point && point <= 0x2661)
|| (0x2663 <= point && point <= 0x2665)
|| (0x2667 <= point && point <= 0x266A)
|| (0x266C <= point && point <= 0x266D)
|| (0x266F == point)
|| (0x269E <= point && point <= 0x269F)
|| (0x26BE <= point && point <= 0x26BF)
|| (0x26C4 <= point && point <= 0x26CD)
|| (0x26CF <= point && point <= 0x26E1)
|| (0x26E3 == point)
|| (0x26E8 <= point && point <= 0x26FF)
|| (0x273D == point)
|| (0x2757 == point)
|| (0x2776 <= point && point <= 0x277F)
|| (0x2B55 <= point && point <= 0x2B59)
|| (0x3248 <= point && point <= 0x324F)
|| (0xE000 <= point && point <= 0xF8FF)
|| (0xFE00 <= point && point <= 0xFE0F)
|| (0xFFFD == point)
|| (0x1F100 <= point && point <= 0x1F10A)
|| (0x1F110 <= point && point <= 0x1F12D)
|| (0x1F130 <= point && point <= 0x1F169)
|| (0x1F170 <= point && point <= 0x1F19A)
|| (0xE0100 <= point && point <= 0xE01EF)
|| (0xF0000 <= point && point <= 0xFFFFD)
|| (0x100000 <= point && point <= 0x10FFFD)) {
return 2;
}
*/
return 1;
};
exports.strWidth = function(str) {
var width = 0;
for (var i = 0; i < str.length; i++) {
width += exports.charWidth(str, i);
if (exports.isSurrogate(str, i)) i++;
}
return width;
};
exports.isSurrogate = function(str, i) {
var point = typeof str !== 'number'
? exports.codePointAt(str, i || 0)
: str;
return point > 0x00ffff;
};
exports.combiningTable = [
[ 0x0300, 0x036F ], [ 0x0483, 0x0486 ], [ 0x0488, 0x0489 ],
[ 0x0591, 0x05BD ], [ 0x05BF, 0x05BF ], [ 0x05C1, 0x05C2 ],
[ 0x05C4, 0x05C5 ], [ 0x05C7, 0x05C7 ], [ 0x0600, 0x0603 ],
[ 0x0610, 0x0615 ], [ 0x064B, 0x065E ], [ 0x0670, 0x0670 ],
[ 0x06D6, 0x06E4 ], [ 0x06E7, 0x06E8 ], [ 0x06EA, 0x06ED ],
[ 0x070F, 0x070F ], [ 0x0711, 0x0711 ], [ 0x0730, 0x074A ],
[ 0x07A6, 0x07B0 ], [ 0x07EB, 0x07F3 ], [ 0x0901, 0x0902 ],
[ 0x093C, 0x093C ], [ 0x0941, 0x0948 ], [ 0x094D, 0x094D ],
[ 0x0951, 0x0954 ], [ 0x0962, 0x0963 ], [ 0x0981, 0x0981 ],
[ 0x09BC, 0x09BC ], [ 0x09C1, 0x09C4 ], [ 0x09CD, 0x09CD ],
[ 0x09E2, 0x09E3 ], [ 0x0A01, 0x0A02 ], [ 0x0A3C, 0x0A3C ],
[ 0x0A41, 0x0A42 ], [ 0x0A47, 0x0A48 ], [ 0x0A4B, 0x0A4D ],
[ 0x0A70, 0x0A71 ], [ 0x0A81, 0x0A82 ], [ 0x0ABC, 0x0ABC ],
[ 0x0AC1, 0x0AC5 ], [ 0x0AC7, 0x0AC8 ], [ 0x0ACD, 0x0ACD ],
[ 0x0AE2, 0x0AE3 ], [ 0x0B01, 0x0B01 ], [ 0x0B3C, 0x0B3C ],
[ 0x0B3F, 0x0B3F ], [ 0x0B41, 0x0B43 ], [ 0x0B4D, 0x0B4D ],
[ 0x0B56, 0x0B56 ], [ 0x0B82, 0x0B82 ], [ 0x0BC0, 0x0BC0 ],
[ 0x0BCD, 0x0BCD ], [ 0x0C3E, 0x0C40 ], [ 0x0C46, 0x0C48 ],
[ 0x0C4A, 0x0C4D ], [ 0x0C55, 0x0C56 ], [ 0x0CBC, 0x0CBC ],
[ 0x0CBF, 0x0CBF ], [ 0x0CC6, 0x0CC6 ], [ 0x0CCC, 0x0CCD ],
[ 0x0CE2, 0x0CE3 ], [ 0x0D41, 0x0D43 ], [ 0x0D4D, 0x0D4D ],
[ 0x0DCA, 0x0DCA ], [ 0x0DD2, 0x0DD4 ], [ 0x0DD6, 0x0DD6 ],
[ 0x0E31, 0x0E31 ], [ 0x0E34, 0x0E3A ], [ 0x0E47, 0x0E4E ],
[ 0x0EB1, 0x0EB1 ], [ 0x0EB4, 0x0EB9 ], [ 0x0EBB, 0x0EBC ],
[ 0x0EC8, 0x0ECD ], [ 0x0F18, 0x0F19 ], [ 0x0F35, 0x0F35 ],
[ 0x0F37, 0x0F37 ], [ 0x0F39, 0x0F39 ], [ 0x0F71, 0x0F7E ],
[ 0x0F80, 0x0F84 ], [ 0x0F86, 0x0F87 ], [ 0x0F90, 0x0F97 ],
[ 0x0F99, 0x0FBC ], [ 0x0FC6, 0x0FC6 ], [ 0x102D, 0x1030 ],
[ 0x1032, 0x1032 ], [ 0x1036, 0x1037 ], [ 0x1039, 0x1039 ],
[ 0x1058, 0x1059 ], [ 0x1160, 0x11FF ], [ 0x135F, 0x135F ],
[ 0x1712, 0x1714 ], [ 0x1732, 0x1734 ], [ 0x1752, 0x1753 ],
[ 0x1772, 0x1773 ], [ 0x17B4, 0x17B5 ], [ 0x17B7, 0x17BD ],
[ 0x17C6, 0x17C6 ], [ 0x17C9, 0x17D3 ], [ 0x17DD, 0x17DD ],
[ 0x180B, 0x180D ], [ 0x18A9, 0x18A9 ], [ 0x1920, 0x1922 ],
[ 0x1927, 0x1928 ], [ 0x1932, 0x1932 ], [ 0x1939, 0x193B ],
[ 0x1A17, 0x1A18 ], [ 0x1B00, 0x1B03 ], [ 0x1B34, 0x1B34 ],
[ 0x1B36, 0x1B3A ], [ 0x1B3C, 0x1B3C ], [ 0x1B42, 0x1B42 ],
[ 0x1B6B, 0x1B73 ], [ 0x1DC0, 0x1DCA ], [ 0x1DFE, 0x1DFF ],
[ 0x200B, 0x200F ], [ 0x202A, 0x202E ], [ 0x2060, 0x2063 ],
[ 0x206A, 0x206F ], [ 0x20D0, 0x20EF ], [ 0x302A, 0x302F ],
[ 0x3099, 0x309A ], [ 0xA806, 0xA806 ], [ 0xA80B, 0xA80B ],
[ 0xA825, 0xA826 ], [ 0xFB1E, 0xFB1E ], [ 0xFE00, 0xFE0F ],
[ 0xFE20, 0xFE23 ], [ 0xFEFF, 0xFEFF ], [ 0xFFF9, 0xFFFB ],
[ 0x10A01, 0x10A03 ], [ 0x10A05, 0x10A06 ], [ 0x10A0C, 0x10A0F ],
[ 0x10A38, 0x10A3A ], [ 0x10A3F, 0x10A3F ], [ 0x1D167, 0x1D169 ],
[ 0x1D173, 0x1D182 ], [ 0x1D185, 0x1D18B ], [ 0x1D1AA, 0x1D1AD ],
[ 0x1D242, 0x1D244 ], [ 0xE0001, 0xE0001 ], [ 0xE0020, 0xE007F ],
[ 0xE0100, 0xE01EF ]
];
exports.combining = exports.combiningTable.reduce(function(out, row) {
for (var i = row[0]; i <= row[1]; i++) {
out[i] = true;
}
return out;
}, {});
exports.isNonSpacing = function(str, i) {
var point = typeof str !== 'number'
? exports.codePointAt(str, i || 0)
: str;
return exports.combining[point] === true;
};
/*
exports.codePointAt = function(str, position) {
position = +position || 0;
var x = str.charCodeAt(position);
var y = str.length > 1 ? str.charCodeAt(position + 1) : 0;
var point = x;
if ((0xD800 <= x && x <= 0xDBFF) && (0xDC00 <= y && y <= 0xDFFF)) {
x &= 0x3FF;
y &= 0x3FF;
point = (x << 10) | y;
point += 0x10000;
}
return point;
};
*/
exports.codePointAt = function(str, position) {
if (str == null) {
throw TypeError();
}
var string = String(str);
var size = string.length;
// `ToInteger`
var index = position ? Number(position) : 0;
if (index != index) { // better `isNaN`
index = 0;
}
// Account for out-of-bounds indices:
if (index < 0 || index >= size) {
return undefined;
}
// Get the first code unit
var first = string.charCodeAt(index);
var second;
if ( // check if it’s the start of a surrogate pair
first >= 0xD800 && first <= 0xDBFF && // high surrogate
size > index + 1 // there is a next code unit
) {
second = string.charCodeAt(index + 1);
if (second >= 0xDC00 && second <= 0xDFFF) { // low surrogate
// http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
return (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
}
}
return first;
};
exports.fromCodePoint = function() {
var MAX_SIZE = 0x4000;
var codeUnits = [];
var highSurrogate;
var lowSurrogate;
var index = -1;
var length = arguments.length;
if (!length) {
return '';
}
var result = '';
while (++index < length) {
var codePoint = Number(arguments[index]);
if (
!isFinite(codePoint) || // `NaN`, `+Infinity`, or `-Infinity`
codePoint < 0 || // not a valid Unicode code point
codePoint > 0x10FFFF || // not a valid Unicode code point
floor(codePoint) != codePoint // not an integer
) {
throw RangeError('Invalid code point: ' + codePoint);
}
if (codePoint <= 0xFFFF) { // BMP code point
codeUnits.push(codePoint);
} else { // Astral code point; split in surrogate halves
// http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
codePoint -= 0x10000;
highSurrogate = (codePoint >> 10) + 0xD800;
lowSurrogate = (codePoint % 0x400) + 0xDC00;
codeUnits.push(highSurrogate, lowSurrogate);
}
if (index + 1 == length || codeUnits.length > MAX_SIZE) {
result += stringFromCharCode.apply(null, codeUnits);
codeUnits.length = 0;
}
}
return result;
};
// Double width characters that are _not_ surrogate pairs.
// NOTE: 0x20000 - 0x2fffd and 0x30000 - 0x3fffd are not necessary for this
// regex anyway. This regex is used to put a blank char after wide chars to
// be eaten, however, if this is a surrogate pair, parseContent already adds
// the extra one char because its length equals 2 instead of 1.
exports.wideChars = new RegExp('(['
+ '\\u1100-\\u115f' // Hangul Jamo init. consonants
+ '\\u2329\\u232a'
+ '\\u2e80-\\u303e\\u3040-\\ua4cf' // CJK ... Yi
+ '\\uac00-\\ud7a3' // Hangul Syllables
+ '\\uf900-\\ufaff' // CJK Compatibility Ideographs
+ '\\ufe10-\\ufe19' // Vertical forms
+ '\\ufe30-\\ufe6f' // CJK Compatibility Forms
+ '\\uff00-\\uff60' // Fullwidth Forms
+ '\\uffe0-\\uffe6'
+ '])', 'g');
// Regex to detect a surrogate pair.
exports.surrogate = /[\ud800-\udbff][\udc00-\udfff]/g;
// Regex to find combining characters.
exports.combiningRegex = exports.combiningTable.reduce(function(out, row) {
var low, high, range;
if (row[0] > 0x00ffff) {
low = exports.fromCodePoint(row[0]);
low = [
hexify(low.charCodeAt(0)),
hexify(low.charCodeAt(1))
];
high = exports.fromCodePoint(row[1]);
high = [
hexify(high.charCodeAt(0)),
hexify(high.charCodeAt(1))
];
range = '[\\u' + low[0] + '-' + '\\u' + high[0] + ']'
+ '[\\u' + low[1] + '-' + '\\u' + high[1] + ']';
if (!~out.indexOf('|')) out += ']';
out += '|' + range;
} else {
low = hexify(row[0]);
high = hexify(row[1]);
low = '\\u' + low;
high = '\\u' + high;
out += low + '-' + high;
}
return out;
}, '[');
exports.combiningRegex = new RegExp(exports.combiningRegex, 'g');
function hexify(n) {
n = n.toString(16);
while (n.length < 4) n = '0' + n;
return n;
}
/*
exports.combiningRegex = new RegExp(
'['
+ '\\u0300-\\u036f'
+ '\\u0483-\\u0486'
+ '\\u0488-\\u0489'
+ '\\u0591-\\u05bd'
+ '\\u05bf-\\u05bf'
+ '\\u05c1-\\u05c2'
+ '\\u05c4-\\u05c5'
+ '\\u05c7-\\u05c7'
+ '\\u0600-\\u0603'
+ '\\u0610-\\u0615'
+ '\\u064b-\\u065e'
+ '\\u0670-\\u0670'
+ '\\u06d6-\\u06e4'
+ '\\u06e7-\\u06e8'
+ '\\u06ea-\\u06ed'
+ '\\u070f-\\u070f'
+ '\\u0711-\\u0711'
+ '\\u0730-\\u074a'
+ '\\u07a6-\\u07b0'
+ '\\u07eb-\\u07f3'
+ '\\u0901-\\u0902'
+ '\\u093c-\\u093c'
+ '\\u0941-\\u0948'
+ '\\u094d-\\u094d'
+ '\\u0951-\\u0954'
+ '\\u0962-\\u0963'
+ '\\u0981-\\u0981'
+ '\\u09bc-\\u09bc'
+ '\\u09c1-\\u09c4'
+ '\\u09cd-\\u09cd'
+ '\\u09e2-\\u09e3'
+ '\\u0a01-\\u0a02'
+ '\\u0a3c-\\u0a3c'
+ '\\u0a41-\\u0a42'
+ '\\u0a47-\\u0a48'
+ '\\u0a4b-\\u0a4d'
+ '\\u0a70-\\u0a71'
+ '\\u0a81-\\u0a82'
+ '\\u0abc-\\u0abc'
+ '\\u0ac1-\\u0ac5'
+ '\\u0ac7-\\u0ac8'
+ '\\u0acd-\\u0acd'
+ '\\u0ae2-\\u0ae3'
+ '\\u0b01-\\u0b01'
+ '\\u0b3c-\\u0b3c'
+ '\\u0b3f-\\u0b3f'
+ '\\u0b41-\\u0b43'
+ '\\u0b4d-\\u0b4d'
+ '\\u0b56-\\u0b56'
+ '\\u0b82-\\u0b82'
+ '\\u0bc0-\\u0bc0'
+ '\\u0bcd-\\u0bcd'
+ '\\u0c3e-\\u0c40'
+ '\\u0c46-\\u0c48'
+ '\\u0c4a-\\u0c4d'
+ '\\u0c55-\\u0c56'
+ '\\u0cbc-\\u0cbc'
+ '\\u0cbf-\\u0cbf'
+ '\\u0cc6-\\u0cc6'
+ '\\u0ccc-\\u0ccd'
+ '\\u0ce2-\\u0ce3'
+ '\\u0d41-\\u0d43'
+ '\\u0d4d-\\u0d4d'
+ '\\u0dca-\\u0dca'
+ '\\u0dd2-\\u0dd4'
+ '\\u0dd6-\\u0dd6'
+ '\\u0e31-\\u0e31'
+ '\\u0e34-\\u0e3a'
+ '\\u0e47-\\u0e4e'
+ '\\u0eb1-\\u0eb1'
+ '\\u0eb4-\\u0eb9'
+ '\\u0ebb-\\u0ebc'
+ '\\u0ec8-\\u0ecd'
+ '\\u0f18-\\u0f19'
+ '\\u0f35-\\u0f35'
+ '\\u0f37-\\u0f37'
+ '\\u0f39-\\u0f39'
+ '\\u0f71-\\u0f7e'
+ '\\u0f80-\\u0f84'
+ '\\u0f86-\\u0f87'
+ '\\u0f90-\\u0f97'
+ '\\u0f99-\\u0fbc'
+ '\\u0fc6-\\u0fc6'
+ '\\u102d-\\u1030'
+ '\\u1032-\\u1032'
+ '\\u1036-\\u1037'
+ '\\u1039-\\u1039'
+ '\\u1058-\\u1059'
+ '\\u1160-\\u11ff'
+ '\\u135f-\\u135f'
+ '\\u1712-\\u1714'
+ '\\u1732-\\u1734'
+ '\\u1752-\\u1753'
+ '\\u1772-\\u1773'
+ '\\u17b4-\\u17b5'
+ '\\u17b7-\\u17bd'
+ '\\u17c6-\\u17c6'
+ '\\u17c9-\\u17d3'
+ '\\u17dd-\\u17dd'
+ '\\u180b-\\u180d'
+ '\\u18a9-\\u18a9'
+ '\\u1920-\\u1922'
+ '\\u1927-\\u1928'
+ '\\u1932-\\u1932'
+ '\\u1939-\\u193b'
+ '\\u1a17-\\u1a18'
+ '\\u1b00-\\u1b03'
+ '\\u1b34-\\u1b34'
+ '\\u1b36-\\u1b3a'
+ '\\u1b3c-\\u1b3c'
+ '\\u1b42-\\u1b42'
+ '\\u1b6b-\\u1b73'
+ '\\u1dc0-\\u1dca'
+ '\\u1dfe-\\u1dff'
+ '\\u200b-\\u200f'
+ '\\u202a-\\u202e'
+ '\\u2060-\\u2063'
+ '\\u206a-\\u206f'
+ '\\u20d0-\\u20ef'
+ '\\u302a-\\u302f'
+ '\\u3099-\\u309a'
+ '\\ua806-\\ua806'
+ '\\ua80b-\\ua80b'
+ '\\ua825-\\ua826'
+ '\\ufb1e-\\ufb1e'
+ '\\ufe00-\\ufe0f'
+ '\\ufe20-\\ufe23'
+ '\\ufeff-\\ufeff'
+ '\\ufff9-\\ufffb'
+ ']'
+ '|[\\ud802-\\ud802][\\ude01-\\ude03]'
+ '|[\\ud802-\\ud802][\\ude05-\\ude06]'
+ '|[\\ud802-\\ud802][\\ude0c-\\ude0f]'
+ '|[\\ud802-\\ud802][\\ude38-\\ude3a]'
+ '|[\\ud802-\\ud802][\\ude3f-\\ude3f]'
+ '|[\\ud834-\\ud834][\\udd67-\\udd69]'
+ '|[\\ud834-\\ud834][\\udd73-\\udd82]'
+ '|[\\ud834-\\ud834][\\udd85-\\udd8b]'
+ '|[\\ud834-\\ud834][\\uddaa-\\uddad]'
+ '|[\\ud834-\\ud834][\\ude42-\\ude44]'
+ '|[\\udb40-\\udb40][\\udc01-\\udc01]'
+ '|[\\udb40-\\udb40][\\udc20-\\udc7f]'
+ '|[\\udb40-\\udb40][\\udd00-\\uddef]'
, 'g');
*/
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