875 lines
23 KiB
PHP
875 lines
23 KiB
PHP
<?php
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/**
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* DOMPDF - PHP5 HTML to PDF renderer
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*
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* File: $RCSfile: stylesheet.cls.php,v $
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* Created on: 2004-06-01
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*
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* Copyright (c) 2004 - Benj Carson <benjcarson@digitaljunkies.ca>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library in the file LICENSE.LGPL; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*
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* Alternatively, you may distribute this software under the terms of the
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* PHP License, version 3.0 or later. A copy of this license should have
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* been distributed with this file in the file LICENSE.PHP . If this is not
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* the case, you can obtain a copy at http://www.php.net/license/3_0.txt.
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*
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* The latest version of DOMPDF might be available at:
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* http://www.digitaljunkies.ca/dompdf
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*
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* @link http://www.digitaljunkies.ca/dompdf
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* @copyright 2004 Benj Carson
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* @author Benj Carson <benjcarson@digitaljunkies.ca>
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* @package dompdf
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* @version 0.5.1
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*/
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/* $Id: stylesheet.cls.php,v 1.16 2006/07/07 21:31:04 benjcarson Exp $ */
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/**
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* The location of the default built-in CSS file.
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* {@link Stylesheet::DEFAULT_STYLESHEET}
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*/
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define('__DEFAULT_STYLESHEET', DOMPDF_LIB_DIR . DIRECTORY_SEPARATOR . "res" . DIRECTORY_SEPARATOR . "html.css");
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/**
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* The master stylesheet class
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*
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* The Stylesheet class is responsible for parsing stylesheets and style
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* tags/attributes. It also acts as a registry of the individual Style
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* objects generated by the current set of loaded CSS files and style
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* elements.
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*
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* @see Style
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* @package dompdf
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*/
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class Stylesheet {
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/**
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* the location of the default built-in CSS file.
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*
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*/
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const DEFAULT_STYLESHEET = __DEFAULT_STYLESHEET; // Hack: can't
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// concatenate stuff in
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// const declarations,
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// but I can do this?
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// protected members
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/**
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* array of currently defined styles
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* @var array
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*/
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private $_styles;
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/**
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* base protocol of the document being parsed
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*
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* Used to handle relative urls.
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*
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* @var string
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*/
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private $_protocol;
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/**
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* base hostname of the document being parsed
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*
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* Used to handle relative urls.
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* @var string
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*/
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private $_base_host;
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/**
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* base path of the document being parsed
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*
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* Used to handle relative urls.
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* @var string
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*/
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private $_base_path;
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/**
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* the style defined by @page rules
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*
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* @var Style
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*/
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private $_page_style;
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/**
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* list of loaded files, used to prevent recursion
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*
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* @var array
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*/
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private $_loaded_files;
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/**
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* accepted CSS media types
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*/
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static $ACCEPTED_MEDIA_TYPES = array("all", "static", "visual",
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"bitmap", "paged", "print");
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/**
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* The class constructor.
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*
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* The base protocol, host & path are initialized to those of
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* the current script.
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*/
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function __construct() {
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$this->_styles = array();
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$this->_loaded_files = array();
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list($this->_protocol, $this->_base_host, $this->_base_path) = explode_url($_SERVER["SCRIPT_FILENAME"]);
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$this->_page_style = null;
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}
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/**
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* Set the base protocol
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*
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* @param string $proto
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*/
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function set_protocol($proto) { $this->_protocol = $proto; }
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/**
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* Set the base host
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*
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* @param string $host
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*/
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function set_host($host) { $this->_base_host = $host; }
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/**
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* Set the base path
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*
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* @param string $path
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*/
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function set_base_path($path) { $this->_base_path = $path; }
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/**
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* Return the base protocol for this stylesheet
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*
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* @return string
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*/
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function get_protocol() { return $this->_protocol; }
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/**
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* Return the base host for this stylesheet
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*
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* @return string
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*/
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function get_host() { return $this->_base_host; }
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/**
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* Return the base path for this stylesheet
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*
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* @return string
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*/
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function get_base_path() { return $this->_base_path; }
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/**
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* add a new Style object to the stylesheet
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*
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* add_style() adds a new Style object to the current stylesheet, or
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* merges a new Style with an existing one.
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*
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* @param string $key the Style's selector
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* @param Style $style the Style to be added
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*/
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function add_style($key, Style $style) {
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if (!is_string($key))
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throw new DOMPDF_Exception("CSS rule must be keyed by a string.");
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if ( isset($this->_styles[$key]) )
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$this->_styles[$key]->merge($style);
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else
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$this->_styles[$key] = clone $style;
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}
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/**
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* lookup a specifc Style object
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*
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* lookup() returns the Style specified by $key, or null if the Style is
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* not found.
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*
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* @param string $key the selector of the requested Style
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* @return Style
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*/
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function lookup($key) {
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if ( !isset($this->_styles[$key]) )
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return null;
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return $this->_styles[$key];
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}
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/**
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* create a new Style object associated with this stylesheet
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*
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* @param Style $parent The style of this style's parent in the DOM tree
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* @return Style
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*/
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function create_style($parent = null) {
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return new Style($this, $parent);
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}
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/**
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* load and parse a CSS string
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*
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* @param string $css
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*/
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function load_css(&$css) { $this->_parse_css($css); }
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/**
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* load and parse a CSS file
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*
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* @param string $file
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*/
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function load_css_file($file) {
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global $_dompdf_warnings;
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// Prevent circular references
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if ( isset($this->_loaded_files[$file]) )
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return;
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$this->_loaded_files[$file] = true;
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$parsed_url = explode_url($file);
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list($this->_protocol, $this->_base_host, $this->_base_path, $filename) = $parsed_url;
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if ( !DOMPDF_ENABLE_REMOTE &&
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($this->_protocol != "" && $this->_protocol != "file://") ) {
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record_warnings(E_USER_WARNING, "Remote CSS file '$file' requested, but DOMPDF_ENABLE_REMOTE is false.", __FILE__, __LINE__);
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return;
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}
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// Fix submitted by Nick Oostveen for aliased directory support:
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if ( $this->_protocol == "" )
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$file = $this->_base_path . $filename;
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else
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$file = build_url($this->_protocol, $this->_base_host, $this->_base_path, $filename);
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set_error_handler("record_warnings");
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$css = file_get_contents($file);
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restore_error_handler();
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if ( $css == "" ) {
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record_warnings(E_USER_WARNING, "Unable to load css file $file", __FILE__, __LINE__);;
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return;
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}
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$this->_parse_css($css);
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}
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/**
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* @link http://www.w3.org/TR/CSS21/cascade.html#specificity}
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*
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* @param string $selector
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* @return int
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*/
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private function _specificity($selector) {
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// http://www.w3.org/TR/CSS21/cascade.html#specificity
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$a = ($selector === "!style attribute") ? 1 : 0;
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$b = min(mb_substr_count($selector, "#"), 255);
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$c = min(mb_substr_count($selector, ".") +
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mb_substr_count($selector, ">") +
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mb_substr_count($selector, "+"), 255);
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$d = min(mb_substr_count($selector, " "), 255);
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return ($a << 24) | ($b << 16) | ($c << 8) | ($d);
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}
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/**
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* converts a CSS selector to an XPath query.
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*
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* @param string $selector
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* @return string
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*/
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private function _css_selector_to_xpath($selector) {
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// Collapse white space and strip whitespace around delimiters
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// $search = array("/\\s+/", "/\\s+([.>#+:])\\s+/");
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// $replace = array(" ", "\\1");
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// $selector = preg_replace($search, $replace, trim($selector));
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// Initial query (non-absolute)
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$query = "//";
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// Parse the selector
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//$s = preg_split("/([ :>.#+])/", $selector, -1, PREG_SPLIT_DELIM_CAPTURE);
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$delimiters = array(" ", ">", ".", "#", "+", ":", "[");
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// Add an implicit space at the beginning of the selector if there is no
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// delimiter there already.
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if ( !in_array($selector{0}, $delimiters) )
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$selector = " $selector";
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$tok = "";
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$len = mb_strlen($selector);
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$i = 0;
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while ( $i < $len ) {
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$s = $selector{$i};
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$i++;
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// Eat characters up to the next delimiter
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$tok = "";
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while ($i < $len) {
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if ( in_array($selector{$i}, $delimiters) )
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break;
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$tok .= $selector{$i++};
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}
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switch ($s) {
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case " ":
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case ">":
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// All elements matching the next token that are direct children of
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// the current token
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$expr = $s == " " ? "descendant" : "child";
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if ( mb_substr($query, -1, 1) != "/" )
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$query .= "/";
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if ( !$tok )
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$tok = "*";
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$query .= "$expr::$tok";
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$tok = "";
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break;
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case ".":
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case "#":
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// All elements matching the current token with a class/id equal to
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// the _next_ token.
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$attr = $s == "." ? "class" : "id";
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// empty class/id == *
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if ( mb_substr($query, -1, 1) == "/" )
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$query .= "*";
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// Match multiple classes: $tok contains the current selected
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// class. Search for class attributes with class="$tok",
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// class=".* $tok .*" and class=".* $tok"
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// This doesn't work because libxml only supports XPath 1.0...
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//$query .= "[matches(@$attr,\"^${tok}\$|^${tok}[ ]+|[ ]+${tok}\$|[ ]+${tok}[ ]+\")]";
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// Query improvement by Michael Sheakoski <michael@mjsdigital.com>:
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$query .= "[contains(concat(' ', @$attr, ' '), concat(' ', '$tok', ' '))]";
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$tok = "";
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break;
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case "+":
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// All sibling elements that folow the current token
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if ( mb_substr($query, -1, 1) != "/" )
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$query .= "/";
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$query .= "following-sibling::$tok";
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$tok = "";
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break;
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case ":":
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// Pseudo-classes
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switch ($tok) {
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case "first-child":
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break;
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case "link":
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$query .= "[@href]";
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$tok = "";
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break;
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case "first-line":
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break;
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case "first-letter":
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break;
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case "before":
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break;
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case "after":
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break;
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}
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break;
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case "[":
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// Attribute selectors. All with an attribute matching the following token(s)
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$attr_delimiters = array("=", "]", "~", "|");
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$tok_len = mb_strlen($tok);
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$j = 0;
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$attr = "";
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$op = "";
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$value = "";
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while ( $j < $tok_len ) {
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if ( in_array($tok{$j}, $attr_delimiters) )
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break;
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$attr .= $tok{$j++};
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}
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switch ( $tok{$j} ) {
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case "~":
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case "|":
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$op .= $tok{$j++};
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if ( $tok{$j} != "=" )
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throw new DOMPDF_Exception("Invalid CSS selector syntax: invalid attribute selector: $selector");
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$op .= $tok{$j};
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break;
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case "=":
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$op = "=";
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break;
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}
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// Read the attribute value, if required
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if ( $op != "" ) {
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$j++;
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while ( $j < $tok_len ) {
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if ( $tok{$j} == "]" )
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break;
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$value .= $tok{$j++};
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}
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}
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if ( $attr == "" )
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throw new DOMPDF_Exception("Invalid CSS selector syntax: missing attribute name");
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switch ( $op ) {
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case "":
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$query .= "[@$attr]";
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break;
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case "=":
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$query .= "[@$attr$op\"$value\"]";
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break;
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case "~=":
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// FIXME: this will break if $value contains quoted strings
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// (e.g. [type~="a b c" "d e f"])
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$values = explode(" ", $value);
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$query .= "[";
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foreach ( $values as $val )
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$query .= "@$attr=\"$val\" or ";
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$query = rtrim($query, " or ") . "]";
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break;
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case "|=":
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$values = explode("-", $value);
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$query .= "[";
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foreach ($values as $val)
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$query .= "starts-with(@$attr, \"$val\") or ";
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$query = rtrim($query, " or ") . "]";
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break;
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}
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break;
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}
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}
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$i++;
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// case ":":
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// // Pseudo selectors: ignore for now. Partially handled directly
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// // below.
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// // Skip until the next special character, leaving the token as-is
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// while ( $i < $len ) {
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// if ( in_array($selector{$i}, $delimiters) )
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// break;
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// $i++;
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// }
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// break;
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// default:
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// // Add the character to the token
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// $tok .= $selector{$i++};
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// break;
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// }
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// }
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// Trim the trailing '/' from the query
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if ( mb_strlen($query) > 2 )
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$query = rtrim($query, "/");
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return $query;
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}
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/**
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* applies all current styles to a particular document tree
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*
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* apply_styles() applies all currently loaded styles to the provided
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* {@link Frame_Tree}. Aside from parsing CSS, this is the main purpose
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* of this class.
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*
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* @param Frame_Tree $tree
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*/
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function apply_styles(Frame_Tree $tree) {
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// Use XPath to select nodes. This would be easier if we could attach
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// Frame objects directly to DOMNodes using the setUserData() method, but
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// we can't do that just yet. Instead, we set a _node attribute_ in
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// Frame->set_id() and use that as a handle on the Frame object via
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// Frame_Tree::$_registry.
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// We create a scratch array of styles indexed by frame id. Once all
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// styles have been assigned, we order the cached styles by specificity
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// and create a final style object to assign to the frame.
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// FIXME: this is not particularly robust...
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$styles = array();
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$xp = new DOMXPath($tree->get_dom());
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// Apply all styles in stylesheet
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foreach ($this->_styles as $selector => $style) {
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$query = $this->_css_selector_to_xpath($selector);
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// pre_var_dump($selector);
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// pre_var_dump($query);
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// echo ($style);
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// Retrieve the nodes
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$nodes = $xp->query($query);
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foreach ($nodes as $node) {
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//echo $node->nodeName . "\n";
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// Retrieve the node id
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if ( $node->nodeType != 1 ) // Only DOMElements get styles
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continue;
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$id = $node->getAttribute("frame_id");
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// Assign the current style to the scratch array
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$spec = $this->_specificity($selector);
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$styles[$id][$spec][] = $style;
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}
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}
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|
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// Now create the styles and assign them to the appropriate frames. (We
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// iterate over the tree using an implicit Frame_Tree iterator.)
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$root_flg = false;
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foreach ($tree->get_frames() as $frame) {
|
|
// pre_r($frame->get_node()->nodeName . ":");
|
|
|
|
if ( !$root_flg && $this->_page_style ) {
|
|
$style = $this->_page_style;
|
|
$root_flg = true;
|
|
|
|
} else
|
|
$style = $this->create_style();
|
|
|
|
// Find nearest DOMElement parent
|
|
$p = $frame;
|
|
while ( $p = $p->get_parent() )
|
|
if ($p->get_node()->nodeType == 1 )
|
|
break;
|
|
|
|
// Styles can only be applied directly to DOMElements; anonymous
|
|
// frames inherit from their parent
|
|
if ( $frame->get_node()->nodeType != 1 ) {
|
|
if ( $p )
|
|
$style->inherit($p->get_style());
|
|
$frame->set_style($style);
|
|
continue;
|
|
}
|
|
|
|
$id = $frame->get_id();
|
|
|
|
// Handle HTML 4.0 attributes
|
|
Attribute_Translator::translate_attributes($frame);
|
|
|
|
// Locate any additional style attributes
|
|
if ( ($str = $frame->get_node()->getAttribute("style")) !== "" ) {
|
|
$spec = $this->_specificity("!style attribute");
|
|
$styles[$id][$spec][] = $this->_parse_properties($str);
|
|
}
|
|
|
|
// Grab the applicable styles
|
|
if ( isset($styles[$id]) ) {
|
|
|
|
$applied_styles = $styles[ $frame->get_id() ];
|
|
|
|
// Sort by specificity
|
|
ksort($applied_styles);
|
|
|
|
// Merge the new styles with the inherited styles
|
|
foreach ($applied_styles as $arr) {
|
|
foreach ($arr as $s)
|
|
$style->merge($s);
|
|
}
|
|
}
|
|
|
|
// Inherit parent's styles if required
|
|
if ( $p ) {
|
|
$style->inherit( $p->get_style() );
|
|
}
|
|
|
|
// pre_r($frame->get_node()->nodeName . ":");
|
|
// echo "<pre>";
|
|
// echo $style;
|
|
// echo "</pre>";
|
|
$frame->set_style($style);
|
|
|
|
}
|
|
|
|
// We're done! Clean out the registry of all styles since we
|
|
// won't be needing this later.
|
|
foreach ( array_keys($this->_styles) as $key ) {
|
|
unset($this->_styles[$key]);
|
|
}
|
|
|
|
}
|
|
|
|
|
|
/**
|
|
* parse a CSS string using a regex parser
|
|
*
|
|
* Called by {@link Stylesheet::parse_css()}
|
|
*
|
|
* @param string $str
|
|
*/
|
|
private function _parse_css($str) {
|
|
|
|
// Destroy comments
|
|
$css = preg_replace("'/\*.*?\*/'si", "", $str);
|
|
|
|
// FIXME: handle '{' within strings, e.g. [attr="string {}"]
|
|
|
|
// Something more legible:
|
|
$re =
|
|
"/\s* # Skip leading whitespace \n".
|
|
"( @([^\s]+)\s+([^{;]*) (?:;|({)) )? # Match @rules followed by ';' or '{' \n".
|
|
"(?(1) # Only parse sub-sections if we're in an @rule... \n".
|
|
" (?(4) # ...and if there was a leading '{' \n".
|
|
" \s*( (?:(?>[^{}]+) ({)? # Parse rulesets and individual @page rules \n".
|
|
" (?(6) (?>[^}]*) }) \s*)+? \n".
|
|
" ) \n".
|
|
" }) # Balancing '}' \n".
|
|
"| # Branch to match regular rules (not preceeded by '@')\n".
|
|
"([^{]*{[^}]*})) # Parse normal rulesets\n".
|
|
"/xs";
|
|
|
|
if ( preg_match_all($re, $css, $matches, PREG_SET_ORDER) === false )
|
|
// An error occured
|
|
throw new DOMPDF_Exception("Error parsing css file: preg_match_all() failed.");
|
|
|
|
// After matching, the array indicies are set as follows:
|
|
//
|
|
// [0] => complete text of match
|
|
// [1] => contains '@import ...;' or '@media {' if applicable
|
|
// [2] => text following @ for cases where [1] is set
|
|
// [3] => media types or full text following '@import ...;'
|
|
// [4] => '{', if present
|
|
// [5] => rulesets within media rules
|
|
// [6] => '{', within media rules
|
|
// [7] => individual rules, outside of media rules
|
|
//
|
|
//pre_r($matches);
|
|
foreach ( $matches as $match ) {
|
|
$match[2] = trim($match[2]);
|
|
|
|
if ( $match[2] !== "" ) {
|
|
// Handle @rules
|
|
switch ($match[2]) {
|
|
|
|
case "import":
|
|
$this->_parse_import($match[3]);
|
|
break;
|
|
|
|
case "media":
|
|
if ( in_array(mb_strtolower(trim($match[3])), self::$ACCEPTED_MEDIA_TYPES ) ) {
|
|
$this->_parse_sections($match[5]);
|
|
}
|
|
break;
|
|
|
|
case "page":
|
|
// Store the style for later...
|
|
if ( is_null($this->_page_style) )
|
|
$this->_page_style = $this->_parse_properties($match[5]);
|
|
else
|
|
$this->_page_style->merge($this->_parse_properties($match[5]));
|
|
break;
|
|
|
|
default:
|
|
// ignore everything else
|
|
break;
|
|
}
|
|
|
|
continue;
|
|
}
|
|
|
|
if ( $match[7] !== "" )
|
|
$this->_parse_sections($match[7]);
|
|
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* parse @import{} sections
|
|
*
|
|
* @param string $url the url of the imported CSS file
|
|
*/
|
|
private function _parse_import($url) {
|
|
$arr = preg_split("/[\s\n]/", $url);
|
|
$url = array_pop($arr);
|
|
$accept = false;
|
|
|
|
if ( count($arr) > 0 ) {
|
|
|
|
// @import url media_type [media_type...]
|
|
foreach ( $arr as $type ) {
|
|
if ( in_array($type, self::$ACCEPTED_MEDIA_TYPES) ) {
|
|
$accept = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
} else
|
|
// unconditional import
|
|
$accept = true;
|
|
|
|
if ( $accept ) {
|
|
$url = str_replace(array('"',"url", "(", ")"), "", $url);
|
|
// Store our current base url properties in case the new url is elsewhere
|
|
$protocol = $this->_protocol;
|
|
$host = $this->_base_host;
|
|
$path = $this->_base_path;
|
|
|
|
// If the protocol is php, assume that we will import using file://
|
|
$url = build_url($protocol == "php://" ? "file://" : $protocol, $host, $path, $url);
|
|
|
|
$this->load_css_file($url);
|
|
|
|
// Restore the current base url
|
|
$this->_protocol = $protocol;
|
|
$this->_base_host = $host;
|
|
$this->_base_path = $path;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* parse regular CSS blocks
|
|
*
|
|
* _parse_properties() creates a new Style object based on the provided
|
|
* CSS rules.
|
|
*
|
|
* @param string $str CSS rules
|
|
* @return Style
|
|
*/
|
|
private function _parse_properties($str) {
|
|
$properties = explode(";", $str);
|
|
|
|
// Create the style
|
|
$style = new Style($this);
|
|
foreach ($properties as $prop) {
|
|
|
|
$prop = trim($prop);
|
|
|
|
if ($prop == "")
|
|
continue;
|
|
|
|
$i = mb_strpos($prop, ":");
|
|
if ( $i === false )
|
|
continue;
|
|
|
|
$prop_name = mb_strtolower(mb_substr($prop, 0, $i));
|
|
$value = mb_substr($prop, $i+1);
|
|
$style->$prop_name = $value;
|
|
|
|
}
|
|
|
|
return $style;
|
|
}
|
|
|
|
/**
|
|
* parse selector + rulesets
|
|
*
|
|
* @param string $str CSS selectors and rulesets
|
|
*/
|
|
private function _parse_sections($str) {
|
|
// Pre-process: collapse all whitespace and strip whitespace around '>',
|
|
// '.', ':', '+', '#'
|
|
|
|
$patterns = array("/[\\s\n]+/", "/\\s+([>.:+#])\\s+/");
|
|
$replacements = array(" ", "\\1");
|
|
$str = preg_replace($patterns, $replacements, $str);
|
|
|
|
$sections = explode("}", $str);
|
|
foreach ($sections as $sect) {
|
|
$i = mb_strpos($sect, "{");
|
|
|
|
$selectors = explode(",", mb_substr($sect, 0, $i));
|
|
$style = $this->_parse_properties(trim(mb_substr($sect, $i+1)));
|
|
|
|
// Assign it to the selected elements
|
|
foreach ($selectors as $selector) {
|
|
$selector = trim($selector);
|
|
|
|
if ($selector == "")
|
|
continue;
|
|
|
|
$this->add_style($selector, $style);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* dumps the entire stylesheet as a string
|
|
*
|
|
* Generates a string of each selector and associated style in the
|
|
* Stylesheet. Useful for debugging.
|
|
*
|
|
* @return string
|
|
*/
|
|
function __toString() {
|
|
$str = "";
|
|
foreach ($this->_styles as $selector => $style)
|
|
$str .= "$selector => " . $style->__toString() . "\n";
|
|
|
|
return $str;
|
|
}
|
|
}
|
|
?>
|