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31 lines
721 B
JavaScript
31 lines
721 B
JavaScript
'use strict';
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var eaw = require('eastasianwidth');
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function stringWidth (ambiguousCharWidth) {
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return function widthOf (str) {
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var i, code, width = 0;
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for(i = 0; i < str.length; i+=1) {
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code = eaw.eastAsianWidth(str.charAt(i));
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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 'H':
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case 'Na':
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case 'N':
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width += 1;
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break;
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case 'A':
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width += ambiguousCharWidth;
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break;
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}
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}
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return width;
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};
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}
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module.exports = stringWidth(2);
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module.exports.narrow = stringWidth(1);
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