<?php
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/*!
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* ISC License
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*
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* Copyright (c) 2018-2021, Andrea Giammarchi, @WebReflection
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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class FlattedString {
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public function __construct($value) {
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$this->value = $value;
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}
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}
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class Flatted {
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// public utilities
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public static function parse($json, $assoc = false, $depth = 512, $options = 0) {
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$input = array_map(
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'Flatted::asString',
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array_map(
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'Flatted::wrap',
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json_decode($json, $assoc, $depth, $options)
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)
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);
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$value = &$input[0];
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$set = array();
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$set[] = &$value;
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if (is_array($value))
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return Flatted::loop(false, array_keys($value), $input, $set, $value);
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if (is_object($value))
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return Flatted::loop(true, Flatted::keys($value), $input, $set, $value);
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return $value;
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}
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public static function stringify($value, $options = 0, $depth = 512) {
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$known = new stdClass;
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$known->key = array();
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$known->value = array();
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$input = array();
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$output = array();
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$i = intval(Flatted::index($known, $input, $value));
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while ($i < count($input)) {
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$output[$i] = Flatted::transform($known, $input, $input[$i]);
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$i++;
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}
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return json_encode($output, $options, $depth);
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}
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// private helpers
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private static function asString($value) {
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return $value instanceof FlattedString ? $value->value : $value;
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}
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private static function index(&$known, &$input, &$value) {
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$input[] = &$value;
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$index = strval(count($input) - 1);
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$known->key[] = &$value;
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$known->value[] = &$index;
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return $index;
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}
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private static function keys(&$value) {
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$obj = new ReflectionObject($value);
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$props = $obj->getProperties();
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$keys = array();
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foreach ($props as $prop)
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$keys[] = $prop->getName();
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return $keys;
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}
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private static function loop($obj, $keys, &$input, &$set, &$output) {
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foreach ($keys as $key) {
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$value = $obj ? $output->$key : $output[$key];
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if ($value instanceof FlattedString)
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Flatted::ref($obj, $key, $input[$value->value], $input, $set, $output);
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}
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return $output;
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}
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private static function relate(&$known, &$input, &$value) {
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if (is_string($value) || is_array($value) || is_object($value)) {
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$key = array_search($value, $known->key, true);
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if ($key !== false)
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return $known->value[$key];
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return Flatted::index($known, $input, $value);
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}
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return $value;
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}
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private static function ref($obj, &$key, &$value, &$input, &$set, &$output) {
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if (is_array($value) && !in_array($value, $set, true)) {
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$set[] = $value;
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$value = Flatted::loop(false, array_keys($value), $input, $set, $value);
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}
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elseif (is_object($value) && !in_array($value, $set, true)) {
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$set[] = $value;
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$value = Flatted::loop(true, Flatted::keys($value), $input, $set, $value);
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}
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if ($obj) {
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$output->$key = &$value;
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}
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else {
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$output[$key] = &$value;
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}
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}
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private static function transform(&$known, &$input, &$value) {
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if (is_array($value)) {
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return array_map(
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function ($value) use(&$known, &$input) {
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return Flatted::relate($known, $input, $value);
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},
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$value
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);
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}
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if (is_object($value)) {
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$object = new stdClass;
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$keys = Flatted::keys($value);
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foreach ($keys as $key)
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$object->$key = Flatted::relate($known, $input, $value->$key);
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return $object;
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}
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return $value;
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}
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private static function wrap($value) {
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if (is_string($value)) {
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return new FlattedString($value);
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}
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if (is_array($value)) {
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return array_map('Flatted::wrap', $value);
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}
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if (is_object($value)) {
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$keys = Flatted::keys($value);
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foreach ($keys as $key) {
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$value->$key = self::wrap($value->$key);
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}
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return $value;
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}
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return $value;
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}
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}
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?>
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