'use strict';
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var isRelative = require('is-relative');
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var isWindows = require('is-windows');
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/**
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* Expose `isAbsolute`
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*/
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module.exports = isAbsolute;
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/**
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* Returns true if a file path is absolute.
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*
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* @param {String} `fp`
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* @return {Boolean}
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*/
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function isAbsolute(fp) {
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if (typeof fp !== 'string') {
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throw new TypeError('isAbsolute expects a string.');
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}
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return isWindows() ? isAbsolute.win32(fp) : isAbsolute.posix(fp);
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}
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/**
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* Test posix paths.
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*/
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isAbsolute.posix = function posixPath(fp) {
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return fp.charAt(0) === '/';
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};
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/**
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* Test windows paths.
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*/
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isAbsolute.win32 = function win32(fp) {
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if (/[a-z]/i.test(fp.charAt(0)) && fp.charAt(1) === ':' && fp.charAt(2) === '\\') {
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return true;
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}
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// Microsoft Azure absolute filepath
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if (fp.slice(0, 2) === '\\\\') {
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return true;
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}
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return !isRelative(fp);
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};
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