309 lines
7.6 KiB
PHP
309 lines
7.6 KiB
PHP
<?php
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namespace W3TC;
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class Minify_AutoCss {
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private $config;
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private $buffer;
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/**
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* CSS files to ignore
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*
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* @var array
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*/
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private $ignore_css_files;
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/**
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* Helper object to use
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*
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* @var _W3_MinifyHelpers
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*/
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private $minify_helpers;
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/**
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* Array of processed styles
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*
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* @var array
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*/
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private $debug_minified_urls = array();
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/**
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* Current position to embed minified style
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*
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* @var integer
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*/
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private $embed_pos;
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/**
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* Current list of files to minify
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*
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* @var array
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*/
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private $files_to_minify;
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/**
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* Current number of minification group
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*
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* @var integer
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*/
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private $debug = false;
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private $embed_to_html;
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/**
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* Constructor
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*
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* @param unknown $config
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* @param unknown $buffer
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* @param unknown $minify_helpers
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*/
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function __construct( $config, $buffer, $minify_helpers ) {
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$this->config = $config;
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$this->debug = $config->get_boolean( 'minify.debug' );
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$this->buffer = $buffer;
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$this->minify_helpers = $minify_helpers;
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// ignored files
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$this->ignore_css_files = $this->config->get_array(
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'minify.reject.files.css' );
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$this->ignore_css_files = array_map( array( '\W3TC\Util_Environment',
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'normalize_file' ), $this->ignore_css_files );
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$this->embed_to_html = $this->config->get_boolean( 'minify.css.embed' );
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}
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/**
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* Does auto-minification
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*
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* @return string buffer of minified content
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*/
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public function execute() {
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// find all style tags
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$buffer_nocomments = preg_replace( '~<!--.*?-->\s*~s', '', $this->buffer );
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$matches = null;
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// end of <head> means another group of styles, cannt be combined
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if ( !preg_match_all( '~((<style\s*[^>]*>.*?</style>)|(<link\s+([^>]+)/?>(.*</link>)?))~is',
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$buffer_nocomments, $matches ) ) {
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$matches = null;
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}
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if ( is_null( $matches ) ) {
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return $this->buffer;
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}
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$style_tags = $matches[1];
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$style_tags = apply_filters( 'w3tc_minify_css_style_tags',
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$style_tags );
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// pass styles
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$this->embed_pos = null;
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$this->files_to_minify = array();
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for ( $n = 0; $n < count( $style_tags ); $n++ ) {
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$this->process_style_tag( $style_tags[$n], $n );
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}
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$this->flush_collected( '' );
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return $this->buffer;
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}
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/**
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* Returns list of minified styles
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*
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* @return array
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*/
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public function get_debug_minified_urls() {
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return $this->debug_minified_urls;
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}
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/**
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* Processes style tag
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*
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* @param unknown $style_tag
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* @return void
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*/
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private function process_style_tag( $style_tag, $style_tag_number ) {
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if ( $this->debug ) {
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Minify_Core::log( 'processing tag ' . substr( $style_tag, 0, 150 ) );
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}
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$tag_pos = strpos( $this->buffer, $style_tag );
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if ( $tag_pos === false ) {
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// style is external but not found, skip processing it
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if ( $this->debug ) {
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Minify_Core::log( 'style not found:' . $style_tag );
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}
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return;
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}
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$style_href = null;
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$causes_flush = true;
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if ( preg_match( '~<link\s+([^>]+)/?>(.*</link>)?~Uis', $style_tag, $match ) ) {
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// all link tags dont cause automatic flush since
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// its minified or its not style <link> tag
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$causes_flush = false;
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$attrs = array();
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$attr_matches = null;
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if ( preg_match_all( '~(\w+)=["\']([^"\']*)["\']~', $match[1],
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$attr_matches, PREG_SET_ORDER ) ) {
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foreach ( $attr_matches as $attr_match ) {
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$name = strtolower( $attr_match[1] );
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$attrs[$name] = trim( $attr_match[2] );
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}
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}
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if ( isset( $attrs['href'] ) && isset( $attrs['rel'] ) &&
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stristr( $attrs['rel'], 'stylesheet' ) !== false &&
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( !isset( $attrs['media'] ) || stristr( $attrs['media'], 'print' ) === false ) ) {
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$style_href = $attrs['href'];
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}
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}
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if ( $causes_flush ) {
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$data = array(
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'style_tag_original' => $style_tag,
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'style_tag_new' => $style_tag,
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'style_tag_number' => $style_tag_number,
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'style_tag_pos' => $tag_pos,
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'should_replace' => false,
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'buffer' => $this->buffer
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);
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$data = apply_filters( 'w3tc_minify_css_do_local_style_minification',
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$data );
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$this->buffer = $data['buffer'];
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if ( $data['should_replace'] ) {
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$this->buffer = substr_replace( $this->buffer,
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$data['style_tag_new'], $tag_pos,
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strlen( $style_tag ) );
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}
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// it's not external style, have to flush what we have before it
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if ( $this->debug ) {
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Minify_Core::log( 'its not link tag, flushing' );
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}
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$this->flush_collected( $style_tag );
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return;
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}
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if ( empty( $style_href ) ) {
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if ( $this->debug ) {
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Minify_Core::log( 'its not style link tag' );
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}
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return;
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}
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$style_href = Util_Environment::url_relative_to_full( $style_href );
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$file = Util_Environment::url_to_docroot_filename( $style_href );
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$step1_result = $this->minify_helpers->is_file_for_minification(
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$style_href, $file );
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if ( $step1_result == 'url' )
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$file = $style_href;
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$step1 = !empty( $step1_result );
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$step2 = !in_array( $file, $this->ignore_css_files );
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$do_tag_minification = $step1 && $step2;
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$do_tag_minification = apply_filters(
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'w3tc_minify_css_do_tag_minification',
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$do_tag_minification, $style_tag, $file );
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if ( !$do_tag_minification ) {
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if ( $this->debug ) {
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Minify_Core::log( 'file ' . $file .
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' didnt pass minification check:' .
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' file_for_min: ' . ( $step1 ? 'true' : 'false' ) .
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' ignore_css_files: ' . ( $step2 ? 'true' : 'false' ) );
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}
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$data = array(
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'style_tag_original' => $style_tag,
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'style_tag_new' => $style_tag,
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'style_tag_number' => $style_tag_number,
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'style_tag_pos' => $tag_pos,
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'style_href' => $style_href,
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'should_replace' => false,
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'buffer' => $this->buffer
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);
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$data = apply_filters( 'w3tc_minify_css_do_excluded_tag_style_minification',
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$data );
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$this->buffer = $data['buffer'];
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if ( $data['should_replace'] ) {
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$this->buffer = substr_replace( $this->buffer,
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$data['style_tag_new'], $tag_pos,
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strlen( $style_tag ) );
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}
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$this->flush_collected( $style_tag );
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return;
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}
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$this->debug_minified_urls[] = $file;
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$this->buffer = substr_replace( $this->buffer, '',
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$tag_pos, strlen( $style_tag ) );
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// put minified file at the place of first tag
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if ( count( $this->files_to_minify ) <= 0 )
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$this->embed_pos = $tag_pos;
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$this->files_to_minify[] = $file;
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if ( $this->config->get_string( 'minify.css.method' ) == 'minify' )
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$this->flush_collected( '' );
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}
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/**
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* Minifies collected styles
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*/
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private function flush_collected( $last_style_tag ) {
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if ( count( $this->files_to_minify ) <= 0 )
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return;
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$do_flush_collected = apply_filters( 'w3tc_minify_css_do_flush_collected',
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true, $last_style_tag, $this );
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if ( !$do_flush_collected )
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return;
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// find embed position
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$embed_pos = $this->embed_pos;
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// build minified style tag
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$data = array(
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'files_to_minify' => $this->files_to_minify,
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'embed_pos' => $embed_pos,
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'buffer' => $this->buffer,
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'embed_to_html' => $this->embed_to_html
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);
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$data = apply_filters( 'w3tc_minify_css_step', $data );
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$this->buffer = $data['buffer'];
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if ( !empty( $data['files_to_minify'] ) ) {
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$style_data = $this->minify_helpers->generate_css_style_tag(
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$data['files_to_minify'],
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$data['embed_to_html'] );
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$data['style_to_embed_url'] = $style_data['url'];
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$data['style_to_embed_body'] = $style_data['body'];
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$data = apply_filters( 'w3tc_minify_css_step_style_to_embed',
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$data );
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$this->buffer = $data['buffer'];
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if ( $this->config->getf_boolean( 'minify.css.http2push' ) ) {
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$this->minify_helpers->http2_header_add(
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$data['style_to_embed_url'], 'style' );
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}
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// replace
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$this->buffer = substr_replace( $this->buffer,
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$data['style_to_embed_body'], $data['embed_pos'], 0 );
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}
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$this->files_to_minify = array();
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}
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}
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