648 lines
28 KiB
PHP
648 lines
28 KiB
PHP
<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* Converts to and from JSON format.
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*
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* JSON (JavaScript Object Notation) is a lightweight data-interchange
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* format. It is easy for humans to read and write. It is easy for machines
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* to parse and generate. It is based on a subset of the JavaScript
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* Programming Language, Standard ECMA-262 3rd Edition - December 1999.
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* This feature can also be found in Python. JSON is a text format that is
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* completely language independent but uses conventions that are familiar
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* to programmers of the C-family of languages, including C, C++, C#, Java,
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* JavaScript, Perl, TCL, and many others. These properties make JSON an
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* ideal data-interchange language.
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*
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* This package provides a simple encoder and decoder for JSON notation. It
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* is intended for use with client-side Javascript applications that make
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* use of HTTPRequest to perform server communication functions - data can
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* be encoded into JSON notation for use in a client-side javascript, or
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* decoded from incoming Javascript requests. JSON format is native to
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* Javascript, and can be directly eval()'ed with no further parsing
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* overhead
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*
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* All strings should be in ASCII or UTF-8 format!
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*
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* PHP versions 4 and 5
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*
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* LICENSE: Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met: Redistributions of source code must retain the
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* above copyright notice, this list of conditions and the following
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* disclaimer. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* @author Michal Migurski <mike-json@teczno.com>
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* @author Matt Knapp <mdknapp[at]gmail[dot]com>
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* @author Brett Stimmerman <brettstimmerman[at]gmail[dot]com>
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* @copyright 2005 Michal Migurski
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* @license http://www.freebsd.org/copyright/freebsd-license.html
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* @link http://pear.php.net/pepr/pepr-proposal-show.php?id=198
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*/
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// for DokuWiki
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if(!defined('DOKU_INC')) die('meh.');
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/**
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* Marker constant for JSON::decode(), used to flag stack state
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*/
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define('JSON_SLICE', 1);
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/**
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* Marker constant for JSON::decode(), used to flag stack state
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*/
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define('JSON_IN_STR', 2);
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/**
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* Marker constant for JSON::decode(), used to flag stack state
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*/
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define('JSON_IN_ARR', 4);
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/**
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* Marker constant for JSON::decode(), used to flag stack state
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*/
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define('JSON_IN_OBJ', 8);
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/**
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* Marker constant for JSON::decode(), used to flag stack state
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*/
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define('JSON_IN_CMT', 16);
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/**
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* Behavior switch for JSON::decode()
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*/
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define('JSON_LOOSE_TYPE', 10);
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/**
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* Behavior switch for JSON::decode()
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*/
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define('JSON_STRICT_TYPE', 11);
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/**
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* Converts to and from JSON format.
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*/
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class JSON {
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/**
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* Disables the use of PHP5's native json_decode()
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*
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* You shouldn't change this usually because the native function is much
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* faster. However, this non-native will also parse slightly broken JSON
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* which might be handy when talking to a non-conform endpoint
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*/
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public $skipnative = false;
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/**
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* constructs a new JSON instance
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*
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* @param int $use object behavior: when encoding or decoding,
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* be loose or strict about object/array usage
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*
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* possible values:
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* JSON_STRICT_TYPE - strict typing, default
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* "{...}" syntax creates objects in decode.
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* JSON_LOOSE_TYPE - loose typing
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* "{...}" syntax creates associative arrays in decode.
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*/
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function __construct($use=JSON_STRICT_TYPE) {
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$this->use = $use;
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}
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/**
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* encodes an arbitrary variable into JSON format
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* If available the native PHP JSON implementation is used.
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*
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* @param mixed $var any number, boolean, string, array, or object to be encoded.
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* see argument 1 to JSON() above for array-parsing behavior.
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* if var is a strng, note that encode() always expects it
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* to be in ASCII or UTF-8 format!
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*
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* @return string JSON string representation of input var
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* @access public
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*/
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function encode($var) {
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if (!$this->skipnative && function_exists('json_encode')){
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return json_encode($var);
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}
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switch (gettype($var)) {
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case 'boolean':
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return $var ? 'true' : 'false';
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case 'NULL':
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return 'null';
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case 'integer':
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return sprintf('%d', $var);
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case 'double':
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case 'float':
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return sprintf('%f', $var);
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case 'string':
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// STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
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$ascii = '';
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$strlen_var = strlen($var);
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/*
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* Iterate over every character in the string,
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* escaping with a slash or encoding to UTF-8 where necessary
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*/
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for ($c = 0; $c < $strlen_var; ++$c) {
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$ord_var_c = ord($var{$c});
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switch ($ord_var_c) {
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case 0x08:
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$ascii .= '\b';
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break;
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case 0x09:
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$ascii .= '\t';
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break;
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case 0x0A:
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$ascii .= '\n';
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break;
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case 0x0C:
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$ascii .= '\f';
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break;
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case 0x0D:
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$ascii .= '\r';
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break;
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case 0x22:
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case 0x2F:
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case 0x5C:
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// double quote, slash, slosh
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$ascii .= '\\'.$var{$c};
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break;
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case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
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// characters U-00000000 - U-0000007F (same as ASCII)
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$ascii .= $var{$c};
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break;
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case (($ord_var_c & 0xE0) == 0xC0):
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// characters U-00000080 - U-000007FF, mask 110XXXXX
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// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
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$char = pack('C*', $ord_var_c, ord($var{$c+1}));
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$c+=1;
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//$utf16 = mb_convert_encoding($char, 'UTF-16', 'UTF-8');
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$utf16 = utf8_to_utf16be($char);
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$ascii .= sprintf('\u%04s', bin2hex($utf16));
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break;
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case (($ord_var_c & 0xF0) == 0xE0):
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// characters U-00000800 - U-0000FFFF, mask 1110XXXX
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// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
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$char = pack('C*', $ord_var_c,
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ord($var{$c+1}),
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ord($var{$c+2}));
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$c+=2;
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//$utf16 = mb_convert_encoding($char, 'UTF-16', 'UTF-8');
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$utf16 = utf8_to_utf16be($char);
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$ascii .= sprintf('\u%04s', bin2hex($utf16));
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break;
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case (($ord_var_c & 0xF8) == 0xF0):
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// characters U-00010000 - U-001FFFFF, mask 11110XXX
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// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
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$char = pack('C*', $ord_var_c,
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ord($var{$c+1}),
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ord($var{$c+2}),
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ord($var{$c+3}));
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$c+=3;
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//$utf16 = mb_convert_encoding($char, 'UTF-16', 'UTF-8');
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$utf16 = utf8_to_utf16be($char);
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$ascii .= sprintf('\u%04s', bin2hex($utf16));
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break;
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case (($ord_var_c & 0xFC) == 0xF8):
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// characters U-00200000 - U-03FFFFFF, mask 111110XX
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// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
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$char = pack('C*', $ord_var_c,
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ord($var{$c+1}),
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ord($var{$c+2}),
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ord($var{$c+3}),
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ord($var{$c+4}));
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$c+=4;
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//$utf16 = mb_convert_encoding($char, 'UTF-16', 'UTF-8');
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$utf16 = utf8_to_utf16be($char);
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$ascii .= sprintf('\u%04s', bin2hex($utf16));
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break;
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case (($ord_var_c & 0xFE) == 0xFC):
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// characters U-04000000 - U-7FFFFFFF, mask 1111110X
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// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
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$char = pack('C*', $ord_var_c,
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ord($var{$c+1}),
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ord($var{$c+2}),
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ord($var{$c+3}),
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ord($var{$c+4}),
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ord($var{$c+5}));
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$c+=5;
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//$utf16 = mb_convert_encoding($char, 'UTF-16', 'UTF-8');
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$utf16 = utf8_to_utf16be($char);
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$ascii .= sprintf('\u%04s', bin2hex($utf16));
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break;
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}
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}
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return '"'.$ascii.'"';
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case 'array':
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/*
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* As per JSON spec if any array key is not an integer
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* we must treat the the whole array as an object. We
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* also try to catch a sparsely populated associative
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* array with numeric keys here because some JS engines
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* will create an array with empty indexes up to
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* max_index which can cause memory issues and because
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* the keys, which may be relevant, will be remapped
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* otherwise.
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*
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* As per the ECMA and JSON specification an object may
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* have any string as a property. Unfortunately due to
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* a hole in the ECMA specification if the key is a
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* ECMA reserved word or starts with a digit the
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* parameter is only accessible using ECMAScript's
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* bracket notation.
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*/
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// treat as a JSON object
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if (is_array($var) && count($var) && (array_keys($var) !== range(0, count($var) - 1))) {
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return sprintf('{%s}', join(',', array_map(array($this, 'name_value'),
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array_keys($var),
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array_values($var))));
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}
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// treat it like a regular array
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return sprintf('[%s]', join(',', array_map(array($this, 'encode'), $var)));
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case 'object':
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$vars = get_object_vars($var);
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return sprintf('{%s}', join(',', array_map(array($this, 'name_value'),
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array_keys($vars),
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array_values($vars))));
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default:
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return '';
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}
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}
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/**
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* encodes an arbitrary variable into JSON format, alias for encode()
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*/
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function enc($var) {
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return $this->encode($var);
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}
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/** function name_value
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* array-walking function for use in generating JSON-formatted name-value pairs
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*
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* @param string $name name of key to use
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* @param mixed $value reference to an array element to be encoded
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*
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* @return string JSON-formatted name-value pair, like '"name":value'
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* @access private
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*/
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function name_value($name, $value) {
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return (sprintf("%s:%s", $this->encode(strval($name)), $this->encode($value)));
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}
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/**
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* reduce a string by removing leading and trailing comments and whitespace
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*
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* @param $str string string value to strip of comments and whitespace
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*
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* @return string string value stripped of comments and whitespace
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* @access private
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*/
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function reduce_string($str) {
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$str = preg_replace(array(
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// eliminate single line comments in '// ...' form
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'#^\s*//(.+)$#m',
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// eliminate multi-line comments in '/* ... */' form, at start of string
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'#^\s*/\*(.+)\*/#Us',
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// eliminate multi-line comments in '/* ... */' form, at end of string
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'#/\*(.+)\*/\s*$#Us'
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), '', $str);
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// eliminate extraneous space
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return trim($str);
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}
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/**
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* decodes a JSON string into appropriate variable
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* If available the native PHP JSON implementation is used.
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*
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* @param string $str JSON-formatted string
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*
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* @return mixed number, boolean, string, array, or object
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* corresponding to given JSON input string.
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* See argument 1 to JSON() above for object-output behavior.
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* Note that decode() always returns strings
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* in ASCII or UTF-8 format!
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* @access public
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*/
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function decode($str) {
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if (!$this->skipnative && function_exists('json_decode')){
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return json_decode($str,($this->use == JSON_LOOSE_TYPE));
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}
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$str = $this->reduce_string($str);
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switch (strtolower($str)) {
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case 'true':
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return true;
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case 'false':
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return false;
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case 'null':
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return null;
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default:
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if (is_numeric($str)) {
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// Lookie-loo, it's a number
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// This would work on its own, but I'm trying to be
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// good about returning integers where appropriate:
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// return (float)$str;
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// Return float or int, as appropriate
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return ((float)$str == (integer)$str)
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? (integer)$str
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: (float)$str;
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} elseif (preg_match('/^("|\').+("|\')$/s', $str, $m) && $m[1] == $m[2]) {
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// STRINGS RETURNED IN UTF-8 FORMAT
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$delim = substr($str, 0, 1);
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$chrs = substr($str, 1, -1);
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$utf8 = '';
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$strlen_chrs = strlen($chrs);
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for ($c = 0; $c < $strlen_chrs; ++$c) {
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$substr_chrs_c_2 = substr($chrs, $c, 2);
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$ord_chrs_c = ord($chrs{$c});
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switch ($substr_chrs_c_2) {
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case '\b':
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$utf8 .= chr(0x08);
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$c+=1;
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break;
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case '\t':
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$utf8 .= chr(0x09);
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$c+=1;
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break;
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case '\n':
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$utf8 .= chr(0x0A);
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$c+=1;
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break;
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case '\f':
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$utf8 .= chr(0x0C);
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$c+=1;
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break;
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case '\r':
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$utf8 .= chr(0x0D);
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$c+=1;
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break;
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case '\\"':
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case '\\\'':
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case '\\\\':
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case '\\/':
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if (($delim == '"' && $substr_chrs_c_2 != '\\\'') ||
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($delim == "'" && $substr_chrs_c_2 != '\\"')) {
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$utf8 .= $chrs{++$c};
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}
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break;
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default:
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if (preg_match('/\\\u[0-9A-F]{4}/i', substr($chrs, $c, 6))) {
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// single, escaped unicode character
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$utf16 = chr(hexdec(substr($chrs, ($c+2), 2)))
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. chr(hexdec(substr($chrs, ($c+4), 2)));
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//$utf8 .= mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
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$utf8 .= utf16be_to_utf8($utf16);
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$c+=5;
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} elseif(($ord_chrs_c >= 0x20) && ($ord_chrs_c <= 0x7F)) {
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$utf8 .= $chrs{$c};
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} elseif(($ord_chrs_c & 0xE0) == 0xC0) {
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// characters U-00000080 - U-000007FF, mask 110XXXXX
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//see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
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$utf8 .= substr($chrs, $c, 2);
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$c += 1;
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} elseif(($ord_chrs_c & 0xF0) == 0xE0) {
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// characters U-00000800 - U-0000FFFF, mask 1110XXXX
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// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
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$utf8 .= substr($chrs, $c, 3);
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$c += 2;
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} elseif(($ord_chrs_c & 0xF8) == 0xF0) {
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// characters U-00010000 - U-001FFFFF, mask 11110XXX
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// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
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$utf8 .= substr($chrs, $c, 4);
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$c += 3;
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} elseif(($ord_chrs_c & 0xFC) == 0xF8) {
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// characters U-00200000 - U-03FFFFFF, mask 111110XX
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// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
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$utf8 .= substr($chrs, $c, 5);
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$c += 4;
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} elseif(($ord_chrs_c & 0xFE) == 0xFC) {
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// characters U-04000000 - U-7FFFFFFF, mask 1111110X
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// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
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$utf8 .= substr($chrs, $c, 6);
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$c += 5;
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}
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break;
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}
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}
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return $utf8;
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} elseif (preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str)) {
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// array, or object notation
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if ($str{0} == '[') {
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$stk = array(JSON_IN_ARR);
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$arr = array();
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} else {
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if ($this->use == JSON_LOOSE_TYPE) {
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$stk = array(JSON_IN_OBJ);
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$obj = array();
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} else {
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$stk = array(JSON_IN_OBJ);
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$obj = new stdClass();
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}
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}
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|
|
array_push($stk, array('what' => JSON_SLICE,
|
|
'where' => 0,
|
|
'delim' => false));
|
|
|
|
$chrs = substr($str, 1, -1);
|
|
$chrs = $this->reduce_string($chrs);
|
|
|
|
if ($chrs == '') {
|
|
if (reset($stk) == JSON_IN_ARR) {
|
|
return $arr;
|
|
|
|
} else {
|
|
return $obj;
|
|
|
|
}
|
|
}
|
|
|
|
//print("\nparsing {$chrs}\n");
|
|
|
|
$strlen_chrs = strlen($chrs);
|
|
|
|
for ($c = 0; $c <= $strlen_chrs; ++$c) {
|
|
|
|
$top = end($stk);
|
|
$substr_chrs_c_2 = substr($chrs, $c, 2);
|
|
|
|
if (($c == $strlen_chrs) || (($chrs{$c} == ',') && ($top['what'] == JSON_SLICE))) {
|
|
// found a comma that is not inside a string, array, etc.,
|
|
// OR we've reached the end of the character list
|
|
$slice = substr($chrs, $top['where'], ($c - $top['where']));
|
|
array_push($stk, array('what' => JSON_SLICE, 'where' => ($c + 1), 'delim' => false));
|
|
//print("Found split at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
|
|
|
|
if (reset($stk) == JSON_IN_ARR) {
|
|
// we are in an array, so just push an element onto the stack
|
|
array_push($arr, $this->decode($slice));
|
|
|
|
} elseif (reset($stk) == JSON_IN_OBJ) {
|
|
// we are in an object, so figure
|
|
// out the property name and set an
|
|
// element in an associative array,
|
|
// for now
|
|
if (preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
|
|
// "name":value pair
|
|
$key = $this->decode($parts[1]);
|
|
$val = $this->decode($parts[2]);
|
|
|
|
if ($this->use == JSON_LOOSE_TYPE) {
|
|
$obj[$key] = $val;
|
|
} else {
|
|
$obj->$key = $val;
|
|
}
|
|
} elseif (preg_match('/^\s*(\w+)\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
|
|
// name:value pair, where name is unquoted
|
|
$key = $parts[1];
|
|
$val = $this->decode($parts[2]);
|
|
|
|
if ($this->use == JSON_LOOSE_TYPE) {
|
|
$obj[$key] = $val;
|
|
} else {
|
|
$obj->$key = $val;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
} elseif ((($chrs{$c} == '"') || ($chrs{$c} == "'")) && ($top['what'] != JSON_IN_STR)) {
|
|
// found a quote, and we are not inside a string
|
|
array_push($stk, array('what' => JSON_IN_STR, 'where' => $c, 'delim' => $chrs{$c}));
|
|
//print("Found start of string at {$c}\n");
|
|
|
|
} elseif (($chrs{$c} == $top['delim']) &&
|
|
($top['what'] == JSON_IN_STR) &&
|
|
((strlen(substr($chrs, 0, $c)) - strlen(rtrim(substr($chrs, 0, $c), '\\'))) % 2 != 1)) {
|
|
// found a quote, we're in a string, and it's not escaped
|
|
// we know that it's not escaped becase there is _not_ an
|
|
// odd number of backslashes at the end of the string so far
|
|
array_pop($stk);
|
|
//print("Found end of string at {$c}: ".substr($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");
|
|
|
|
} elseif (($chrs{$c} == '[') &&
|
|
in_array($top['what'], array(JSON_SLICE, JSON_IN_ARR, JSON_IN_OBJ))) {
|
|
// found a left-bracket, and we are in an array, object, or slice
|
|
array_push($stk, array('what' => JSON_IN_ARR, 'where' => $c, 'delim' => false));
|
|
//print("Found start of array at {$c}\n");
|
|
|
|
} elseif (($chrs{$c} == ']') && ($top['what'] == JSON_IN_ARR)) {
|
|
// found a right-bracket, and we're in an array
|
|
array_pop($stk);
|
|
//print("Found end of array at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
|
|
|
|
} elseif (($chrs{$c} == '{') &&
|
|
in_array($top['what'], array(JSON_SLICE, JSON_IN_ARR, JSON_IN_OBJ))) {
|
|
// found a left-brace, and we are in an array, object, or slice
|
|
array_push($stk, array('what' => JSON_IN_OBJ, 'where' => $c, 'delim' => false));
|
|
//print("Found start of object at {$c}\n");
|
|
|
|
} elseif (($chrs{$c} == '}') && ($top['what'] == JSON_IN_OBJ)) {
|
|
// found a right-brace, and we're in an object
|
|
array_pop($stk);
|
|
//print("Found end of object at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
|
|
|
|
} elseif (($substr_chrs_c_2 == '/*') &&
|
|
in_array($top['what'], array(JSON_SLICE, JSON_IN_ARR, JSON_IN_OBJ))) {
|
|
// found a comment start, and we are in an array, object, or slice
|
|
array_push($stk, array('what' => JSON_IN_CMT, 'where' => $c, 'delim' => false));
|
|
$c++;
|
|
//print("Found start of comment at {$c}\n");
|
|
|
|
} elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == JSON_IN_CMT)) {
|
|
// found a comment end, and we're in one now
|
|
array_pop($stk);
|
|
$c++;
|
|
|
|
for ($i = $top['where']; $i <= $c; ++$i)
|
|
$chrs = substr_replace($chrs, ' ', $i, 1);
|
|
|
|
//print("Found end of comment at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (reset($stk) == JSON_IN_ARR) {
|
|
return $arr;
|
|
|
|
} elseif (reset($stk) == JSON_IN_OBJ) {
|
|
return $obj;
|
|
|
|
}
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* decodes a JSON string into appropriate variable; alias for decode()
|
|
*/
|
|
function dec($var) {
|
|
return $this->decode($var);
|
|
}
|
|
}
|
|
|