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61 lines
1.5 KiB
JavaScript
61 lines
1.5 KiB
JavaScript
/*!
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* encodeurl
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* Copyright(c) 2016 Douglas Christopher Wilson
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* MIT Licensed
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*/
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'use strict'
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/**
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* Module exports.
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* @public
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*/
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module.exports = encodeUrl
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/**
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* RegExp to match non-URL code points, *after* encoding (i.e. not including "%")
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* and including invalid escape sequences.
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* @private
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*/
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var ENCODE_CHARS_REGEXP = /(?:[^\x21\x25\x26-\x3B\x3D\x3F-\x5B\x5D\x5F\x61-\x7A\x7E]|%(?:[^0-9A-Fa-f]|[0-9A-Fa-f][^0-9A-Fa-f]|$))+/g
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/**
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* RegExp to match unmatched surrogate pair.
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* @private
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*/
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var UNMATCHED_SURROGATE_PAIR_REGEXP = /(^|[^\uD800-\uDBFF])[\uDC00-\uDFFF]|[\uD800-\uDBFF]([^\uDC00-\uDFFF]|$)/g
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/**
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* String to replace unmatched surrogate pair with.
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* @private
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*/
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var UNMATCHED_SURROGATE_PAIR_REPLACE = '$1\uFFFD$2'
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/**
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* Encode a URL to a percent-encoded form, excluding already-encoded sequences.
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*
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* This function will take an already-encoded URL and encode all the non-URL
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* code points. This function will not encode the "%" character unless it is
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* not part of a valid sequence (`%20` will be left as-is, but `%foo` will
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* be encoded as `%25foo`).
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*
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* This encode is meant to be "safe" and does not throw errors. It will try as
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* hard as it can to properly encode the given URL, including replacing any raw,
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* unpaired surrogate pairs with the Unicode replacement character prior to
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* encoding.
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*
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* @param {string} url
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* @return {string}
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* @public
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*/
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function encodeUrl (url) {
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return String(url)
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.replace(UNMATCHED_SURROGATE_PAIR_REGEXP, UNMATCHED_SURROGATE_PAIR_REPLACE)
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.replace(ENCODE_CHARS_REGEXP, encodeURI)
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}
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