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273 lines
10 KiB
PHP
273 lines
10 KiB
PHP
<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\helpers;
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use yii\base\Arrayable;
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use yii\base\InvalidValueException;
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/**
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* BaseVarDumper provides concrete implementation for [[VarDumper]].
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*
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* Do not use BaseVarDumper. Use [[VarDumper]] instead.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class BaseVarDumper
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{
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private static $_objects;
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private static $_output;
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private static $_depth;
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/**
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* Displays a variable.
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* This method achieves the similar functionality as var_dump and print_r
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* but is more robust when handling complex objects such as Yii controllers.
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* @param mixed $var variable to be dumped
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* @param int $depth maximum depth that the dumper should go into the variable. Defaults to 10.
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* @param bool $highlight whether the result should be syntax-highlighted
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*/
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public static function dump($var, $depth = 10, $highlight = false)
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{
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echo static::dumpAsString($var, $depth, $highlight);
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}
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/**
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* Dumps a variable in terms of a string.
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* This method achieves the similar functionality as var_dump and print_r
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* but is more robust when handling complex objects such as Yii controllers.
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* @param mixed $var variable to be dumped
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* @param int $depth maximum depth that the dumper should go into the variable. Defaults to 10.
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* @param bool $highlight whether the result should be syntax-highlighted
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* @return string the string representation of the variable
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*/
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public static function dumpAsString($var, $depth = 10, $highlight = false)
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{
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self::$_output = '';
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self::$_objects = [];
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self::$_depth = $depth;
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self::dumpInternal($var, 0);
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if ($highlight) {
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$result = highlight_string("<?php\n" . self::$_output, true);
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self::$_output = preg_replace('/<\\?php<br \\/>/', '', $result, 1);
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}
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return self::$_output;
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}
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/**
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* @param mixed $var variable to be dumped
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* @param int $level depth level
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*/
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private static function dumpInternal($var, $level)
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{
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switch (gettype($var)) {
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case 'boolean':
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self::$_output .= $var ? 'true' : 'false';
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break;
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case 'integer':
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self::$_output .= "$var";
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break;
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case 'double':
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self::$_output .= "$var";
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break;
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case 'string':
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self::$_output .= "'" . addslashes($var) . "'";
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break;
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case 'resource':
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self::$_output .= '{resource}';
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break;
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case 'NULL':
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self::$_output .= 'null';
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break;
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case 'unknown type':
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self::$_output .= '{unknown}';
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break;
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case 'array':
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if (self::$_depth <= $level) {
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self::$_output .= '[...]';
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} elseif (empty($var)) {
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self::$_output .= '[]';
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} else {
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$keys = array_keys($var);
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$spaces = str_repeat(' ', $level * 4);
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self::$_output .= '[';
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foreach ($keys as $key) {
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self::$_output .= "\n" . $spaces . ' ';
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self::dumpInternal($key, 0);
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self::$_output .= ' => ';
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self::dumpInternal($var[$key], $level + 1);
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}
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self::$_output .= "\n" . $spaces . ']';
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}
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break;
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case 'object':
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if (($id = array_search($var, self::$_objects, true)) !== false) {
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self::$_output .= get_class($var) . '#' . ($id + 1) . '(...)';
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} elseif (self::$_depth <= $level) {
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self::$_output .= get_class($var) . '(...)';
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} else {
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$id = array_push(self::$_objects, $var);
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$className = get_class($var);
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$spaces = str_repeat(' ', $level * 4);
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self::$_output .= "$className#$id\n" . $spaces . '(';
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if ('__PHP_Incomplete_Class' !== get_class($var) && method_exists($var, '__debugInfo')) {
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$dumpValues = $var->__debugInfo();
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if (!is_array($dumpValues)) {
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throw new InvalidValueException('__debuginfo() must return an array');
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}
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} else {
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$dumpValues = (array) $var;
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}
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foreach ($dumpValues as $key => $value) {
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$keyDisplay = strtr(trim($key), "\0", ':');
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self::$_output .= "\n" . $spaces . " [$keyDisplay] => ";
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self::dumpInternal($value, $level + 1);
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}
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self::$_output .= "\n" . $spaces . ')';
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}
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break;
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}
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}
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/**
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* Exports a variable as a string representation.
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*
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* The string is a valid PHP expression that can be evaluated by PHP parser
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* and the evaluation result will give back the variable value.
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*
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* This method is similar to `var_export()`. The main difference is that
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* it generates more compact string representation using short array syntax.
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*
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* It also handles objects by using the PHP functions serialize() and unserialize().
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*
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* PHP 5.4 or above is required to parse the exported value.
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*
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* @param mixed $var the variable to be exported.
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* @return string a string representation of the variable
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*/
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public static function export($var)
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{
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self::$_output = '';
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self::exportInternal($var, 0);
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return self::$_output;
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}
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/**
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* @param mixed $var variable to be exported
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* @param int $level depth level
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*/
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private static function exportInternal($var, $level)
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{
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switch (gettype($var)) {
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case 'NULL':
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self::$_output .= 'null';
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break;
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case 'array':
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if (empty($var)) {
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self::$_output .= '[]';
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} else {
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$keys = array_keys($var);
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$outputKeys = ($keys !== range(0, count($var) - 1));
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$spaces = str_repeat(' ', $level * 4);
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self::$_output .= '[';
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foreach ($keys as $key) {
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self::$_output .= "\n" . $spaces . ' ';
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if ($outputKeys) {
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self::exportInternal($key, 0);
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self::$_output .= ' => ';
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}
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self::exportInternal($var[$key], $level + 1);
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self::$_output .= ',';
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}
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self::$_output .= "\n" . $spaces . ']';
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}
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break;
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case 'object':
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if ($var instanceof \Closure) {
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self::$_output .= self::exportClosure($var);
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} else {
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try {
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$output = 'unserialize(' . var_export(serialize($var), true) . ')';
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} catch (\Exception $e) {
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// serialize may fail, for example: if object contains a `\Closure` instance
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// so we use a fallback
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if ($var instanceof Arrayable) {
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self::exportInternal($var->toArray(), $level);
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return;
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} elseif ($var instanceof \IteratorAggregate) {
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$varAsArray = [];
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foreach ($var as $key => $value) {
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$varAsArray[$key] = $value;
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}
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self::exportInternal($varAsArray, $level);
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return;
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} elseif ('__PHP_Incomplete_Class' !== get_class($var) && method_exists($var, '__toString')) {
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$output = var_export($var->__toString(), true);
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} else {
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$outputBackup = self::$_output;
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$output = var_export(self::dumpAsString($var), true);
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self::$_output = $outputBackup;
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}
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}
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self::$_output .= $output;
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}
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break;
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default:
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self::$_output .= var_export($var, true);
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}
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}
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/**
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* Exports a [[Closure]] instance.
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* @param \Closure $closure closure instance.
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* @return string
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*/
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private static function exportClosure(\Closure $closure)
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{
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$reflection = new \ReflectionFunction($closure);
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$fileName = $reflection->getFileName();
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$start = $reflection->getStartLine();
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$end = $reflection->getEndLine();
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if ($fileName === false || $start === false || $end === false) {
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return 'function() {/* Error: unable to determine Closure source */}';
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}
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--$start;
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$source = implode("\n", array_slice(file($fileName), $start, $end - $start));
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$tokens = token_get_all('<?php ' . $source);
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array_shift($tokens);
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$closureTokens = [];
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$pendingParenthesisCount = 0;
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foreach ($tokens as $token) {
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if (isset($token[0]) && $token[0] === T_FUNCTION) {
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$closureTokens[] = $token[1];
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continue;
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}
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if ($closureTokens !== []) {
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$closureTokens[] = isset($token[1]) ? $token[1] : $token;
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if ($token === '}') {
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$pendingParenthesisCount--;
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if ($pendingParenthesisCount === 0) {
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break;
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}
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} elseif ($token === '{') {
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$pendingParenthesisCount++;
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}
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}
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}
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return implode('', $closureTokens);
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}
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}
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