107 lines
2.5 KiB
JavaScript
107 lines
2.5 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
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var utf16ToUTF8Array = require( './../../utf16-to-utf8-array' );
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var format = require( './../../format' );
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// VARIABLES //
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// Character codes:
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var UNDERSCORE = 95|0;
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var PERIOD = 46|0;
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var HYPHEN = 45|0;
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var TILDE = 126|0;
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var ZERO = 48|0;
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var NINE = 57|0;
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var A = 65|0;
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var Z = 90|0;
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var a = 97|0;
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var z = 122|0;
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// MAIN //
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/**
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* Percent-encode a UTF-16 encoded string according to [RFC 3986][1].
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*
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* [1]: https://tools.ietf.org/html/rfc3986#section-2.1
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*
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* @param {string} str - string to percent-encode
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* @throws {TypeError} must provide a string
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* @returns {string} percent-encoded string
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*
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* @example
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* var str1 = 'Ladies + Gentlemen';
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*
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* var str2 = percentEncode( str1 );
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* // returns 'Ladies%20%2B%20Gentlemen'
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*/
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function percentEncode( str ) {
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var byte;
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var out;
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var len;
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var buf;
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var i;
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if ( !isString( str ) ) {
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throw new TypeError( format( 'invalid argument. Must provide a string. Value: `%s`.', str ) );
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}
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// Convert to an array of octets using UTF-8 encoding (see https://tools.ietf.org/html/rfc3986#section-2.5):
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buf = utf16ToUTF8Array( str );
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// Encode the string...
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len = buf.length;
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out = '';
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for ( i = 0; i < len; i++ ) {
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byte = buf[ i ];
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if (
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// ASCII Digits:
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( byte >= ZERO && byte <= NINE ) ||
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// ASCII uppercase letters:
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( byte >= A && byte <= Z ) ||
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// ASCII lowercase letters:
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( byte >= a && byte <= z ) ||
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// ASCII unreserved characters (see https://tools.ietf.org/html/rfc3986#section-2.3):
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byte === HYPHEN ||
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byte === PERIOD ||
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byte === UNDERSCORE ||
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byte === TILDE
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) {
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out += str.charAt( i );
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} else {
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// Convert an octet to hexadecimal and uppercase according to the RFC (see https://tools.ietf.org/html/rfc3986#section-2.1):
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out += '%' + byte.toString( 16 ).toUpperCase();
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}
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}
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return out;
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}
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// EXPORTS //
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module.exports = percentEncode;
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