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d7aa8fa088
Update ESLint to 2.1.0. ESLint has a number of potentially-useful new features but this change attempts to be minimal in its changes. However, some things could not be avoided reasonably. ESLint 2.1.0 found a few lint issues that ESLing 1.x missed with template strings that did not take advantage of any features of template strings, and `let` declarations where `const` sufficed. Additionally, ESLint 2.1.0 removes some granularity around enabling ES6 features. Some features (e.g., spread operator) that had been turned off in our configuration for ESLint 1.x are now permitted. PR-URL: https://github.com/nodejs/node/pull/5214 Reviewed-By: Michaël Zasso <mic.besace@gmail.com> Reviewed-By: jbergstroem - Johan Bergström <bugs@bergstroem.nu> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Roman Reiss <me@silverwind.io> Reviewed-By: Myles Borins <myles.borins@gmail.com>
33 lines
636 B
JavaScript
33 lines
636 B
JavaScript
'use strict';
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var stripAnsi = require('strip-ansi');
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var codePointAt = require('code-point-at');
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var isFullwidthCodePoint = require('is-fullwidth-code-point');
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// https://github.com/nodejs/io.js/blob/cff7300a578be1b10001f2d967aaedc88aee6402/lib/readline.js#L1345
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module.exports = function (str) {
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if (typeof str !== 'string' || str.length === 0) {
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return 0;
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}
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var width = 0;
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str = stripAnsi(str);
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for (var i = 0; i < str.length; i++) {
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var code = codePointAt(str, i);
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// surrogates
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if (code >= 0x10000) {
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i++;
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}
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if (isFullwidthCodePoint(code)) {
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width += 2;
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} else {
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width++;
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}
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}
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return width;
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};
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