523 lines
15 KiB
PHP
523 lines
15 KiB
PHP
<?php
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// phpcs:ignoreFile
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/**
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* modified PHP implementation of Matthias Mullie's Abstract minifier class.
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*
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* @author Matthias Mullie <minify@mullie.eu>
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* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
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* @license MIT License
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*/
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namespace LiteSpeed\Lib\CSS_JS_MIN\Minify;
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use LiteSpeed\Lib\CSS_JS_MIN\Minify\Exception\IOException;
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defined( 'WPINC' ) || exit;
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abstract class Minify {
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/**
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* The data to be minified.
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*
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* @var string[]
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*/
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protected $data = array();
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/**
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* Array of patterns to match.
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*
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* @var string[]
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*/
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protected $patterns = array();
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/**
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* This array will hold content of strings and regular expressions that have
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* been extracted from the JS source code, so we can reliably match "code",
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* without having to worry about potential "code-like" characters inside.
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*
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* @internal
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*
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* @var string[]
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*/
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public $extracted = array();
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/**
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* Init the minify class - optionally, code may be passed along already.
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*/
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public function __construct( /* $data = null, ... */ ) {
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// it's possible to add the source through the constructor as well ;)
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if ( func_num_args() ) {
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call_user_func_array( array( $this, 'add' ), func_get_args() );
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}
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}
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/**
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* Add a file or straight-up code to be minified.
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*
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* @param string|string[] $data
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*
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* @return static
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*/
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public function add( $data /* $data = null, ... */ ) {
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// bogus "usage" of parameter $data: scrutinizer warns this variable is
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// not used (we're using func_get_args instead to support overloading),
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// but it still needs to be defined because it makes no sense to have
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// this function without argument :)
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$args = array( $data ) + func_get_args();
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// this method can be overloaded
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foreach ( $args as $data ) {
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if ( is_array( $data ) ) {
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call_user_func_array( array( $this, 'add' ), $data );
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continue;
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}
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// redefine var
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$data = (string) $data;
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// load data
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$value = $this->load( $data );
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$key = ( $data != $value ) ? $data : count( $this->data );
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// replace CR linefeeds etc.
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// @see https://github.com/matthiasmullie/minify/pull/139
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$value = str_replace( array( "\r\n", "\r" ), "\n", $value );
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// store data
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$this->data[ $key ] = $value;
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}
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return $this;
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}
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/**
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* Add a file to be minified.
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*
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* @param string|string[] $data
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*
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* @return static
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*
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* @throws IOException
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*/
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public function addFile( $data /* $data = null, ... */ ) {
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// bogus "usage" of parameter $data: scrutinizer warns this variable is
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// not used (we're using func_get_args instead to support overloading),
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// but it still needs to be defined because it makes no sense to have
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// this function without argument :)
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$args = array( $data ) + func_get_args();
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// this method can be overloaded
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foreach ( $args as $path ) {
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if ( is_array( $path ) ) {
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call_user_func_array( array( $this, 'addFile' ), $path );
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continue;
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}
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// redefine var
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$path = (string) $path;
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// check if we can read the file
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if ( ! $this->canImportFile( $path ) ) {
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throw new IOException( 'The file "' . $path . '" could not be opened for reading. Check if PHP has enough permissions.' );
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}
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$this->add( $path );
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}
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return $this;
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}
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/**
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* Minify the data & (optionally) saves it to a file.
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*
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* @param string[optional] $path Path to write the data to
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*
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* @return string The minified data
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*/
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public function minify( $path = null ) {
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$content = $this->execute( $path );
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// save to path
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if ( $path !== null ) {
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$this->save( $content, $path );
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}
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return $content;
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}
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/**
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* Minify & gzip the data & (optionally) saves it to a file.
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*
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* @param string[optional] $path Path to write the data to
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* @param int[optional] $level Compression level, from 0 to 9
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*
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* @return string The minified & gzipped data
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*/
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public function gzip( $path = null, $level = 9 ) {
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$content = $this->execute( $path );
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$content = gzencode( $content, $level, FORCE_GZIP );
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// save to path
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if ( $path !== null ) {
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$this->save( $content, $path );
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}
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return $content;
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}
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/**
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* Minify the data.
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*
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* @param string[optional] $path Path to write the data to
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*
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* @return string The minified data
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*/
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abstract public function execute( $path = null );
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/**
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* Load data.
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*
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* @param string $data Either a path to a file or the content itself
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*
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* @return string
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*/
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protected function load( $data ) {
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// check if the data is a file
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if ( $this->canImportFile( $data ) ) {
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$data = file_get_contents( $data );
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// strip BOM, if any
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if ( substr( $data, 0, 3 ) == "\xef\xbb\xbf" ) {
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$data = substr( $data, 3 );
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}
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}
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return $data;
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}
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/**
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* Save to file.
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*
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* @param string $content The minified data
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* @param string $path The path to save the minified data to
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*
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* @throws IOException
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*/
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protected function save( $content, $path ) {
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$handler = $this->openFileForWriting( $path );
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$this->writeToFile( $handler, $content );
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@fclose( $handler );
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}
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/**
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* Register a pattern to execute against the source content.
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*
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* If $replacement is a string, it must be plain text. Placeholders like $1 or \2 don't work.
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* If you need that functionality, use a callback instead.
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*
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* @param string $pattern PCRE pattern
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* @param string|callable $replacement Replacement value for matched pattern
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*/
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protected function registerPattern( $pattern, $replacement = '' ) {
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// study the pattern, we'll execute it more than once
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$pattern .= 'S';
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$this->patterns[] = array( $pattern, $replacement );
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}
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/**
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* Both JS and CSS use the same form of multi-line comment, so putting the common code here.
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*/
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protected function stripMultilineComments() {
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// First extract comments we want to keep, so they can be restored later
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// PHP only supports $this inside anonymous functions since 5.4
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$minifier = $this;
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$callback = function ( $match ) use ( $minifier ) {
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$count = count( $minifier->extracted );
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$placeholder = '/*' . $count . '*/';
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$minifier->extracted[ $placeholder ] = $match[0];
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return $placeholder;
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};
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$this->registerPattern(
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'/
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# optional newline
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\n?
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# start comment
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\/\*
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# comment content
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(?:
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# either starts with an !
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!
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# or, after some number of characters which do not end the comment
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(?:(?!\*\/).)*?
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# there is either a @license or @preserve tag
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@(?:license|preserve)
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)
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# then match to the end of the comment
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.*?\*\/\n?
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/ixs',
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$callback
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);
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// Then strip all other comments
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$this->registerPattern( '/\/\*.*?\*\//s', '' );
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}
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/**
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* We can't "just" run some regular expressions against JavaScript: it's a
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* complex language. E.g. having an occurrence of // xyz would be a comment,
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* unless it's used within a string. Of you could have something that looks
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* like a 'string', but inside a comment.
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* The only way to accurately replace these pieces is to traverse the JS one
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* character at a time and try to find whatever starts first.
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*
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* @param string $content The content to replace patterns in
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*
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* @return string The (manipulated) content
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*/
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protected function replace( $content ) {
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$contentLength = strlen( $content );
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$output = '';
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$processedOffset = 0;
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$positions = array_fill( 0, count( $this->patterns ), -1 );
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$matches = array();
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while ( $processedOffset < $contentLength ) {
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// find first match for all patterns
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foreach ( $this->patterns as $i => $pattern ) {
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list($pattern, $replacement) = $pattern;
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// we can safely ignore patterns for positions we've unset earlier,
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// because we know these won't show up anymore
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if ( array_key_exists( $i, $positions ) == false ) {
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continue;
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}
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// no need to re-run matches that are still in the part of the
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// content that hasn't been processed
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if ( $positions[ $i ] >= $processedOffset ) {
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continue;
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}
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$match = null;
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if ( preg_match( $pattern, $content, $match, PREG_OFFSET_CAPTURE, $processedOffset ) ) {
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$matches[ $i ] = $match;
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// we'll store the match position as well; that way, we
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// don't have to redo all preg_matches after changing only
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// the first (we'll still know where those others are)
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$positions[ $i ] = $match[0][1];
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} else {
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// if the pattern couldn't be matched, there's no point in
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// executing it again in later runs on this same content;
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// ignore this one until we reach end of content
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unset( $matches[ $i ], $positions[ $i ] );
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}
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}
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// no more matches to find: everything's been processed, break out
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if ( ! $matches ) {
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// output the remaining content
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$output .= substr( $content, $processedOffset );
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break;
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}
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// see which of the patterns actually found the first thing (we'll
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// only want to execute that one, since we're unsure if what the
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// other found was not inside what the first found)
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$matchOffset = min( $positions );
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$firstPattern = array_search( $matchOffset, $positions );
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$match = $matches[ $firstPattern ];
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// execute the pattern that matches earliest in the content string
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list(, $replacement) = $this->patterns[ $firstPattern ];
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// add the part of the input between $processedOffset and the first match;
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// that content wasn't matched by anything
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$output .= substr( $content, $processedOffset, $matchOffset - $processedOffset );
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// add the replacement for the match
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$output .= $this->executeReplacement( $replacement, $match );
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// advance $processedOffset past the match
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$processedOffset = $matchOffset + strlen( $match[0][0] );
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}
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return $output;
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}
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/**
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* If $replacement is a callback, execute it, passing in the match data.
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* If it's a string, just pass it through.
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*
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* @param string|callable $replacement Replacement value
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* @param array $match Match data, in PREG_OFFSET_CAPTURE form
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*
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* @return string
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*/
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protected function executeReplacement( $replacement, $match ) {
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if ( ! is_callable( $replacement ) ) {
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return $replacement;
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}
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// convert $match from the PREG_OFFSET_CAPTURE form to the form the callback expects
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foreach ( $match as &$matchItem ) {
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$matchItem = $matchItem[0];
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}
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return $replacement( $match );
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}
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/**
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* Strings are a pattern we need to match, in order to ignore potential
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* code-like content inside them, but we just want all of the string
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* content to remain untouched.
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*
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* This method will replace all string content with simple STRING#
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* placeholder text, so we've rid all strings from characters that may be
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* misinterpreted. Original string content will be saved in $this->extracted
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* and after doing all other minifying, we can restore the original content
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* via restoreStrings().
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*
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* @param string[optional] $chars
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* @param string[optional] $placeholderPrefix
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*/
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protected function extractStrings( $chars = '\'"', $placeholderPrefix = '' ) {
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// PHP only supports $this inside anonymous functions since 5.4
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$minifier = $this;
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$callback = function ( $match ) use ( $minifier, $placeholderPrefix ) {
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// check the second index here, because the first always contains a quote
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if ( $match[2] === '' ) {
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/*
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* Empty strings need no placeholder; they can't be confused for
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* anything else anyway.
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* But we still needed to match them, for the extraction routine
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* to skip over this particular string.
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*/
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return $match[0];
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}
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$count = count( $minifier->extracted );
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$placeholder = $match[1] . $placeholderPrefix . $count . $match[1];
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$minifier->extracted[ $placeholder ] = $match[1] . $match[2] . $match[1];
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return $placeholder;
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};
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/*
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* The \\ messiness explained:
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* * Don't count ' or " as end-of-string if it's escaped (has backslash
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* in front of it)
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* * Unless... that backslash itself is escaped (another leading slash),
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* in which case it's no longer escaping the ' or "
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* * So there can be either no backslash, or an even number
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* * multiply all of that times 4, to account for the escaping that has
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* to be done to pass the backslash into the PHP string without it being
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* considered as escape-char (times 2) and to get it in the regex,
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* escaped (times 2)
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*/
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$this->registerPattern( '/([' . $chars . '])(.*?(?<!\\\\)(\\\\\\\\)*+)\\1/s', $callback );
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}
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/**
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* This method will restore all extracted data (strings, regexes) that were
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* replaced with placeholder text in extract*(). The original content was
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* saved in $this->extracted.
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*
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* @param string $content
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*
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* @return string
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*/
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protected function restoreExtractedData( $content ) {
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if ( ! $this->extracted ) {
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// nothing was extracted, nothing to restore
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return $content;
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}
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$content = strtr( $content, $this->extracted );
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$this->extracted = array();
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return $content;
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}
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/**
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* Check if the path is a regular file and can be read.
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*
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* @param string $path
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*
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* @return bool
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*/
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protected function canImportFile( $path ) {
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$parsed = parse_url( $path );
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if (
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// file is elsewhere
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isset( $parsed['host'] )
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// file responds to queries (may change, or need to bypass cache)
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|| isset( $parsed['query'] )
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) {
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return false;
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}
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try {
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return strlen( $path ) < PHP_MAXPATHLEN && @is_file( $path ) && is_readable( $path );
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}
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// catch openbasedir exceptions which are not caught by @ on is_file()
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catch ( \Exception $e ) {
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return false;
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}
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}
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/**
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* Attempts to open file specified by $path for writing.
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*
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* @param string $path The path to the file
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*
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* @return resource Specifier for the target file
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*
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* @throws IOException
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*/
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protected function openFileForWriting( $path ) {
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if ( $path === '' || ( $handler = @fopen( $path, 'w' ) ) === false ) {
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throw new IOException( 'The file "' . $path . '" could not be opened for writing. Check if PHP has enough permissions.' );
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}
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return $handler;
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}
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/**
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* Attempts to write $content to the file specified by $handler. $path is used for printing exceptions.
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*
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* @param resource $handler The resource to write to
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* @param string $content The content to write
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* @param string $path The path to the file (for exception printing only)
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*
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* @throws IOException
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*/
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protected function writeToFile( $handler, $content, $path = '' ) {
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if (
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! is_resource( $handler )
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|| ( $result = @fwrite( $handler, $content ) ) === false
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|| ( $result < strlen( $content ) )
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) {
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throw new IOException( 'The file "' . $path . '" could not be written to. Check your disk space and file permissions.' );
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}
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}
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protected static function str_replace_first( $search, $replace, $subject ) {
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$pos = strpos( $subject, $search );
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if ( $pos !== false ) {
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return substr_replace( $subject, $replace, $pos, strlen( $search ) );
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}
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return $subject;
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}
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}
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