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Edit File : Stylesheet.php \| Size : 62.35 KB
<?php /** * @package dompdf * @link http://dompdf.github.com/ * @author Benj Carson <benjcarson@digitaljunkies.ca> * @author Helmut Tischer <htischer@weihenstephan.org> * @author Fabien Ménager <fabien.menager@gmail.com> * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License / namespace Dompdf\Css; use DOMElement; use DOMXPath; use Dompdf\Dompdf; use Dompdf\Helpers; use Dompdf\Exception; use Dompdf\FontMetrics; use Dompdf\Frame\FrameTree; /* * The master stylesheet class * * The Stylesheet class is responsible for parsing stylesheets and style * tags/attributes. It also acts as a registry of the individual Style * objects generated by the current set of loaded CSS files and style * elements. * * @see Style * @package dompdf / class Stylesheet { /* * The location of the default built-in CSS file. / const DEFAULT_STYLESHEET = "/lib/res/html.css"; /* * User agent stylesheet origin * * @var int / const ORIG_UA = 1; /* * User normal stylesheet origin * * @var int / const ORIG_USER = 2; /* * Author normal stylesheet origin * * @var int / const ORIG_AUTHOR = 3; / * The highest possible specificity is 0x01000000 (and that is only for author * stylesheets, as it is for inline styles). Origin precedence can be achieved by * adding multiples of 0x10000000 to the actual specificity. Important * declarations are handled in Style; though technically they should be handled * here so that user important declarations can be made to take precedence over * user important declarations, this doesn't matter in practice as Dompdf does * not support user stylesheets, and user agent stylesheets can not include * important declarations. / private static $_stylesheet_origins = array( self::ORIG_UA => 0x00000000, // user agent declarations self::ORIG_USER => 0x10000000, // user normal declarations self::ORIG_AUTHOR => 0x30000000, // author normal declarations ); / * Non-CSS presentational hints (i.e. HTML 4 attributes) are handled as if added * to the beginning of an author stylesheet, i.e. anything in author stylesheets * should override them. / const SPEC_NON_CSS = 0x20000000; /* * Current dompdf instance * * @var Dompdf / private $_dompdf; /* * Array of currently defined styles * * @var Style[] / private $_styles; /* * Base protocol of the document being parsed * Used to handle relative urls. * * @var string / private $_protocol; /* * Base hostname of the document being parsed * Used to handle relative urls. * * @var string / private $_base_host; /* * Base path of the document being parsed * Used to handle relative urls. * * @var string / private $_base_path; /* * The styles defined by @page rules * * @var array<Style> / private $_page_styles; /* * List of loaded files, used to prevent recursion * * @var array / private $_loaded_files; /* * Current stylesheet origin * * @var int / private $_current_origin = self::ORIG_UA; /* * Accepted CSS media types * List of types and parsing rules for future extensions: * http://www.w3.org/TR/REC-html40/types.html * screen, tty, tv, projection, handheld, print, braille, aural, all * The following are non standard extensions for undocumented specific environments. * static, visual, bitmap, paged, dompdf * Note, even though the generated pdf file is intended for print output, * the desired content might be different (e.g. screen or projection view of html file). * Therefore allow specification of content by dompdf setting Options::defaultMediaType. * If given, replace media "print" by Options::defaultMediaType. * (Previous version $ACCEPTED_MEDIA_TYPES = $ACCEPTED_GENERIC_MEDIA_TYPES + $ACCEPTED_DEFAULT_MEDIA_TYPE) / static $ACCEPTED_DEFAULT_MEDIA_TYPE = "print"; static $ACCEPTED_GENERIC_MEDIA_TYPES = array("all", "static", "visual", "bitmap", "paged", "dompdf"); static $VALID_MEDIA_TYPES = array("all", "aural", "bitmap", "braille", "dompdf", "embossed", "handheld", "paged", "print", "projection", "screen", "speech", "static", "tty", "tv", "visual"); /* * @var FontMetrics / private $fontMetrics; /* * The class constructor. * * The base protocol, host & path are initialized to those of * the current script. / function __construct(Dompdf $dompdf) { $this->_dompdf = $dompdf; $this->setFontMetrics($dompdf->getFontMetrics()); $this->_styles = array(); $this->_loaded_files = array(); $script = __FILE__; if(isset($_SERVER["SCRIPT_FILENAME"])){ $script = $_SERVER["SCRIPT_FILENAME"]; } list($this->_protocol, $this->_base_host, $this->_base_path) = Helpers::explode_url($script); $this->_page_styles = array("base" => new Style($this)); } /* * Set the base protocol * * @param string $protocol / function set_protocol($protocol) { $this->_protocol = $protocol; } /* * Set the base host * * @param string $host / function set_host($host) { $this->_base_host = $host; } /* * Set the base path * * @param string $path / function set_base_path($path) { $this->_base_path = $path; } /* * Return the Dompdf object * * @return Dompdf / function get_dompdf() { return $this->_dompdf; } /* * Return the base protocol for this stylesheet * * @return string / function get_protocol() { return $this->_protocol; } /* * Return the base host for this stylesheet * * @return string / function get_host() { return $this->_base_host; } /* * Return the base path for this stylesheet * * @return string / function get_base_path() { return $this->_base_path; } /* * Return the array of page styles * * @return Style[] / function get_page_styles() { return $this->_page_styles; } /* * Add a new Style object to the stylesheet * add_style() adds a new Style object to the current stylesheet, or * merges a new Style with an existing one. * * @param string $key the Style's selector * @param Style $style the Style to be added * * @throws \Dompdf\Exception / function add_style($key, Style $style) { if (!is_string($key)) { throw new Exception("CSS rule must be keyed by a string."); } if (!isset($this->_styles[$key])) { $this->_styles[$key] = array(); } $new_style = clone $style; $new_style->set_origin($this->_current_origin); $this->_styles[$key][] = $new_style; } /* * lookup a specific Style collection * * lookup() returns the Style collection specified by $key, or null if the Style is * not found. * * @param string $key the selector of the requested Style * @return Style * * @Fixme _styles is a two dimensional array. It should produce wrong results / function lookup($key) { if (!isset($this->_styles[$key])) { return null; } return $this->_styles[$key]; } /* * create a new Style object associated with this stylesheet * * @param Style $parent The style of this style's parent in the DOM tree * @return Style / function create_style(Style $parent = null) { if ($parent == null) { $parent = $this; } return new Style($parent, $this->_current_origin); } /* * load and parse a CSS string * * @param string $css * @param int $origin / function load_css(&$css, $origin = self::ORIG_AUTHOR) { if ($origin) { $this->_current_origin = $origin; } $this->_parse_css($css); } /* * load and parse a CSS file * * @param string $file * @param int $origin / function load_css_file($file, $origin = self::ORIG_AUTHOR) { if ($origin) { $this->_current_origin = $origin; } // Prevent circular references if (isset($this->_loaded_files[$file])) { return; } $this->_loaded_files[$file] = true; if (strpos($file, "data:") === 0) { $parsed = Helpers::parse_data_uri($file); $css = $parsed["data"]; } else { $parsed_url = Helpers::explode_url($file); list($this->_protocol, $this->_base_host, $this->_base_path, $filename) = $parsed_url; // Fix submitted by Nick Oostveen for aliased directory support: if ($this->_protocol == "") { $file = $this->_base_path . $filename; } else { $file = Helpers::build_url($this->_protocol, $this->_base_host, $this->_base_path, $filename); } list($css, $http_response_header) = Helpers::getFileContent($file, $this->_dompdf->getHttpContext()); $good_mime_type = true; // See http://the-stickman.com/web-development/php/getting-http-response-headers-when-using-file_get_contents/ if (isset($http_response_header) && !$this->_dompdf->getQuirksmode()) { foreach ($http_response_header as $_header) { if (preg_match("@Content-Type:\s([\w/]+)@i", $_header, $matches) && ($matches[1] !== "text/css") ) { $good_mime_type = false; } } } if (!$good_mime_type \|\| empty($css)) { Helpers::record_warnings(E_USER_WARNING, "Unable to load css file $file", __FILE__, __LINE__); return; } } $this->_parse_css($css); } /** * @link http://www.w3.org/TR/CSS21/cascade.html#specificity * * @param string $selector * @param int $origin : * - Stylesheet::ORIG_UA: user agent style sheet * - Stylesheet::ORIG_USER: user style sheet * - Stylesheet::ORIG_AUTHOR: author style sheet * * @return int / private function _specificity($selector, $origin = self::ORIG_AUTHOR) { // http://www.w3.org/TR/CSS21/cascade.html#specificity // ignoring the ":" pseudoclass modifiers // also ignored in _css_selector_to_xpath $a = ($selector === "!attr") ? 1 : 0; $b = min(mb_substr_count($selector, "#"), 255); $c = min(mb_substr_count($selector, ".") + mb_substr_count($selector, "["), 255); $d = min(mb_substr_count($selector, " ") + mb_substr_count($selector, ">") + mb_substr_count($selector, "+"), 255); //If a normal element name is at the beginning of the string, //a leading whitespace might have been removed on whitespace collapsing and removal //therefore there might be one whitespace less as selected element names //this can lead to a too small specificity //see _css_selector_to_xpath if (!in_array($selector[0], array(" ", ">", ".", "#", "+", ":", "[")) && $selector !== "") { $d++; } if ($this->_dompdf->getOptions()->getDebugCss()) { /DEBUGCSS/ print "<pre>\n"; /DEBUGCSS/ printf("_specificity(): 0x%08x \"%s\"\n", self::$_stylesheet_origins[$origin] + (($a << 24) \| ($b << 16) \| ($c << 8) \| ($d)), $selector); /DEBUGCSS/ print "</pre>"; } return self::$_stylesheet_origins[$origin] + (($a << 24) \| ($b << 16) \| ($c << 8) \| ($d)); } /** * Converts a CSS selector to an XPath query. * * @param string $selector * @param bool $first_pass * * @throws Exception * @return array / private function _css_selector_to_xpath($selector, $first_pass = false) { // Collapse white space and strip whitespace around delimiters //$search = array("/\\s+/", "/\\s+([.>#+:])\\s+/"); //$replace = array(" ", "\\1"); //$selector = preg_replace($search, $replace, trim($selector)); // Initial query (non-absolute) $query = "//"; // Will contain :before and :after $pseudo_elements = array(); // Will contain :link, etc $pseudo_classes = array(); // Parse the selector //$s = preg_split("/([ :>.#+])/", $selector, -1, PREG_SPLIT_DELIM_CAPTURE); $delimiters = array(" ", ">", ".", "#", "+", ":", "[", "("); // Add an implicit at the beginning of the selector // if it begins with an attribute selector if ($selector[0] === "[") { $selector = "$selector"; } // Add an implicit space at the beginning of the selector if there is no // delimiter there already. if (!in_array($selector[0], $delimiters)) { $selector = " $selector"; } $tok = ""; $len = mb_strlen($selector); $i = 0; while ($i < $len) { $s = $selector[$i]; $i++; // Eat characters up to the next delimiter $tok = ""; $in_attr = false; $in_func = false; while ($i < $len) { $c = $selector[$i]; $c_prev = $selector[$i - 1]; if (!$in_func && !$in_attr && in_array($c, $delimiters) && !(($c == $c_prev) == ":")) { break; } if ($c_prev === "[") { $in_attr = true; } if ($c_prev === "(") { $in_func = true; } $tok .= $selector[$i++]; if ($in_attr && $c === "]") { $in_attr = false; break; } if ($in_func && $c === ")") { $in_func = false; break; } } switch ($s) { case " ": case ">": // All elements matching the next token that are direct children of // the current token $expr = $s === " " ? "descendant" : "child"; if (mb_substr($query, -1, 1) !== "/") { $query .= "/"; } // Tag names are case-insensitive $tok = strtolower($tok); if (!$tok) { $tok = ""; } $query .= "$expr::$tok"; $tok = ""; break; case ".": case "#": // All elements matching the current token with a class/id equal to // the _next_ token. $attr = $s === "." ? "class" : "id"; // empty class/id == * if (mb_substr($query, -1, 1) === "/") { $query .= ""; } // Match multiple classes: $tok contains the current selected // class. Search for class attributes with class="$tok", // class=". $tok ." and class=". $tok" // This doesn't work because libxml only supports XPath 1.0... //$query .= "[matches(@$attr,\"^${tok}\$\|^${tok}[ ]+\|[ ]+${tok}\$\|[ ]+${tok}[ ]+\")]"; // Query improvement by Michael Sheakoski <michael@mjsdigital.com>: $query .= "[contains(concat(' ', @$attr, ' '), concat(' ', '$tok', ' '))]"; $tok = ""; break; case "+": // All sibling elements that follow the current token if (mb_substr($query, -1, 1) !== "/") { $query .= "/"; } $query .= "following-sibling::$tok"; $tok = ""; break; case ":": $i2 = $i - strlen($tok) - 2; // the char before ":" if (($i2 < 0 \|\| !isset($selector[$i2]) \|\| (in_array($selector[$i2], $delimiters) && $selector[$i2] != ":")) && substr($query, -1) != "") { $query .= ""; } $last = false; // Pseudo-classes switch ($tok) { case "first-child": $query .= "[1]"; $tok = ""; break; case "last-child": $query .= "[not(following-sibling::)]"; $tok = ""; break; case "first-of-type": $query .= "[position() = 1]"; $tok = ""; break; case "last-of-type": $query .= "[position() = last()]"; $tok = ""; break; // an+b, n, odd, and even /* @noinspection PhpMissingBreakStatementInspection / case "nth-last-of-type": $last = true; case "nth-of-type": //FIXME: this fix-up is pretty ugly, would parsing the selector in reverse work better generally? $descendant_delimeter = strrpos($query, "::"); $isChild = substr($query, $descendant_delimeter-5, 5) == "child"; $el = substr($query, $descendant_delimeter+2); $query = substr($query, 0, strrpos($query, "/")) . ($isChild ? "/" : "//") . $el; $pseudo_classes[$tok] = true; $p = $i + 1; $nth = trim(mb_substr($selector, $p, strpos($selector, ")", $i) - $p)); // 1 if (preg_match("/^\d+$/", $nth)) { $condition = "position() = $nth"; } // odd elseif ($nth === "odd") { $condition = "(position() mod 2) = 1"; } // even elseif ($nth === "even") { $condition = "(position() mod 2) = 0"; } // an+b else { $condition = $this->_selector_an_plus_b($nth, $last); } $query .= "[$condition]"; $tok = ""; break; /* @noinspection PhpMissingBreakStatementInspection / case "nth-last-child": $last = true; case "nth-child": //FIXME: this fix-up is pretty ugly, would parsing the selector in reverse work better generally? $descendant_delimeter = strrpos($query, "::"); $isChild = substr($query, $descendant_delimeter-5, 5) == "child"; $el = substr($query, $descendant_delimeter+2); $query = substr($query, 0, strrpos($query, "/")) . ($isChild ? "/" : "//") . ""; $pseudo_classes[$tok] = true; $p = $i + 1; $nth = trim(mb_substr($selector, $p, strpos($selector, ")", $i) - $p)); // 1 if (preg_match("/^\d+$/", $nth)) { $condition = "position() = $nth"; } // odd elseif ($nth === "odd") { $condition = "(position() mod 2) = 1"; } // even elseif ($nth === "even") { $condition = "(position() mod 2) = 0"; } // an+b else { $condition = $this->_selector_an_plus_b($nth, $last); } $query .= "[$condition]"; if ($el != "") { $query .= "[name() = '$el']"; } $tok = ""; break; //TODO: bit of a hack attempt at matches support, currently only matches against elements case "matches": $pseudo_classes[$tok] = true; $p = $i + 1; $matchList = trim(mb_substr($selector, $p, strpos($selector, ")", $i) - $p)); // Tag names are case-insensitive $elements = array_map("trim", explode(",", strtolower($matchList))); foreach ($elements as &$element) { $element = "name() = '$element'"; } $query .= "[" . implode(" or ", $elements) . "]"; $tok = ""; break; case "link": $query .= "[@href]"; $tok = ""; break; case "first-line": case ":first-line": case "first-letter": case ":first-letter": // TODO $el = trim($tok, ":"); $pseudo_elements[$el] = true; break; // N/A case "focus": case "active": case "hover": case "visited": $query .= "[false()]"; $tok = ""; break; / Pseudo-elements / case "before": case ":before": case "after": case ":after": $pos = trim($tok, ":"); $pseudo_elements[$pos] = true; if (!$first_pass) { $query .= "/[@$pos]"; } $tok = ""; break; case "empty": $query .= "[not() and not(normalize-space())]"; $tok = ""; break; case "disabled": case "checked": $query .= "[@$tok]"; $tok = ""; break; case "enabled": $query .= "[not(@disabled)]"; $tok = ""; break; // the selector is not handled, until we support all possible selectors force an empty set (silent failure) default: $query = "/../.."; // go up two levels because generated content starts on the body element $tok = ""; break; } break; case "[": // Attribute selectors. All with an attribute matching the following token(s) $attr_delimiters = array("=", "]", "~", "\|", "$", "^", ""); $tok_len = mb_strlen($tok); $j = 0; $attr = ""; $op = ""; $value = ""; while ($j < $tok_len) { if (in_array($tok[$j], $attr_delimiters)) { break; } $attr .= $tok[$j++]; } switch ($tok[$j]) { case "~": case "\|": case "$": case "^": case "": $op .= $tok[$j++]; if ($tok[$j] !== "=") { throw new Exception("Invalid CSS selector syntax: invalid attribute selector: $selector"); } $op .= $tok[$j]; break; case "=": $op = "="; break; } // Read the attribute value, if required if ($op != "") { $j++; while ($j < $tok_len) { if ($tok[$j] === "]") { break; } $value .= $tok[$j++]; } } if ($attr == "") { throw new Exception("Invalid CSS selector syntax: missing attribute name"); } $value = trim($value, "\"'"); switch ($op) { case "": $query .= "[@$attr]"; break; case "=": $query .= "[@$attr=\"$value\"]"; break; case "~=": // FIXME: this will break if $value contains quoted strings // (e.g. [type~="a b c" "d e f"]) $values = explode(" ", $value); $query .= "["; foreach ($values as $val) { $query .= "@$attr=\"$val\" or "; } $query = rtrim($query, " or ") . "]"; break; case "\|=": $values = explode("-", $value); $query .= "["; foreach ($values as $val) { $query .= "starts-with(@$attr, \"$val\") or "; } $query = rtrim($query, " or ") . "]"; break; case "$=": $query .= "[substring(@$attr, string-length(@$attr)-" . (strlen($value) - 1) . ")=\"$value\"]"; break; case "^=": $query .= "[starts-with(@$attr,\"$value\")]"; break; case "=": $query .= "[contains(@$attr,\"$value\")]"; break; } break; } } $i++; // case ":": // // Pseudo selectors: ignore for now. Partially handled directly // // below. // // Skip until the next special character, leaving the token as-is // while ( $i < $len ) { // if ( in_array($selector[$i], $delimiters) ) // break; // $i++; // } // break; // default: // // Add the character to the token // $tok .= $selector[$i++]; // break; // } // } // Trim the trailing '/' from the query if (mb_strlen($query) > 2) { $query = rtrim($query, "/"); } return array("query" => $query, "pseudo_elements" => $pseudo_elements); } /** * https://github.com/tenderlove/nokogiri/blob/master/lib/nokogiri/css/xpath_visitor.rb * * @param $expr * @param bool $last * @return string / protected function _selector_an_plus_b($expr, $last = false) { $expr = preg_replace("/\s/", "", $expr); if (!preg_match("/^(?P<a>-?[0-9])?n(?P<b>[-+]?[0-9]+)?$/", $expr, $matches)) { return "false()"; } $a = ((isset($matches["a"]) && $matches["a"] !== "") ? intval($matches["a"]) : 1); $b = ((isset($matches["b"]) && $matches["b"] !== "") ? intval($matches["b"]) : 0); $position = ($last ? "(last()-position()+1)" : "position()"); if ($b == 0) { return "($position mod $a) = 0"; } else { $compare = (($a < 0) ? "<=" : ">="); $b2 = -$b; if ($b2 >= 0) { $b2 = "+$b2"; } return "($position $compare $b) and ((($position $b2) mod " . abs($a) . ") = 0)"; } } /** * applies all current styles to a particular document tree * * apply_styles() applies all currently loaded styles to the provided * {@link FrameTree}. Aside from parsing CSS, this is the main purpose * of this class. * * @param \Dompdf\Frame\FrameTree $tree / function apply_styles(FrameTree $tree) { // Use XPath to select nodes. This would be easier if we could attach // Frame objects directly to DOMNodes using the setUserData() method, but // we can't do that just yet. Instead, we set a _node attribute_ in // Frame->set_id() and use that as a handle on the Frame object via // FrameTree::$_registry. // We create a scratch array of styles indexed by frame id. Once all // styles have been assigned, we order the cached styles by specificity // and create a final style object to assign to the frame. // FIXME: this is not particularly robust... $styles = array(); $xp = new DOMXPath($tree->get_dom()); $DEBUGCSS = $this->_dompdf->getOptions()->getDebugCss(); // Add generated content foreach ($this->_styles as $selector => $selector_styles) { /* @var Style $style / foreach ($selector_styles as $style) { if (strpos($selector, ":before") === false && strpos($selector, ":after") === false) { continue; } $query = $this->_css_selector_to_xpath($selector, true); // Retrieve the nodes, limit to body for generated content //TODO: If we use a context node can we remove the leading dot? $nodes = @$xp->query('.' . $query["query"]); if ($nodes == null) { Helpers::record_warnings(E_USER_WARNING, "The CSS selector '$selector' is not valid", __FILE__, __LINE__); continue; } /* @var \DOMElement $node / foreach ($nodes as $node) { // Only DOMElements get styles if ($node->nodeType != XML_ELEMENT_NODE) { continue; } foreach (array_keys($query["pseudo_elements"], true, true) as $pos) { // Do not add a new pseudo element if another one already matched if ($node->hasAttribute("dompdf_{$pos}_frame_id")) { continue; } if (($src = $this->_image($style->get_prop('content'))) !== "none") { $new_node = $node->ownerDocument->createElement("img_generated"); $new_node->setAttribute("src", $src); } else { $new_node = $node->ownerDocument->createElement("dompdf_generated"); } $new_node->setAttribute($pos, $pos); $new_frame_id = $tree->insert_node($node, $new_node, $pos); $node->setAttribute("dompdf_{$pos}_frame_id", $new_frame_id); } } } } // Apply all styles in stylesheet foreach ($this->_styles as $selector => $selector_styles) { /* @var Style $style / foreach ($selector_styles as $style) { $query = $this->_css_selector_to_xpath($selector); // Retrieve the nodes $nodes = @$xp->query($query["query"]); if ($nodes == null) { Helpers::record_warnings(E_USER_WARNING, "The CSS selector '$selector' is not valid", __FILE__, __LINE__); continue; } $spec = $this->_specificity($selector, $style->get_origin()); foreach ($nodes as $node) { // Retrieve the node id // Only DOMElements get styles if ($node->nodeType != XML_ELEMENT_NODE) { continue; } $id = $node->getAttribute("frame_id"); // Assign the current style to the scratch array $styles[$id][$spec][] = $style; } } } // Set the page width, height, and orientation based on the canvas paper size $canvas = $this->_dompdf->getCanvas(); $paper_width = $canvas->get_width(); $paper_height = $canvas->get_height(); $paper_orientation = ($paper_width > $paper_height ? "landscape" : "portrait"); if ($this->_page_styles["base"] && is_array($this->_page_styles["base"]->size)) { $paper_width = $this->_page_styles['base']->size[0]; $paper_height = $this->_page_styles['base']->size[1]; $paper_orientation = ($paper_width > $paper_height ? "landscape" : "portrait"); } // Now create the styles and assign them to the appropriate frames. (We // iterate over the tree using an implicit FrameTree iterator.) $root_flg = false; foreach ($tree->get_frames() as $frame) { // Helpers::pre_r($frame->get_node()->nodeName . ":"); if (!$root_flg && $this->_page_styles["base"]) { $style = $this->_page_styles["base"]; } else { $style = $this->create_style(); } // Find nearest DOMElement parent $p = $frame; while ($p = $p->get_parent()) { if ($p->get_node()->nodeType == XML_ELEMENT_NODE) { break; } } // Styles can only be applied directly to DOMElements; anonymous // frames inherit from their parent if ($frame->get_node()->nodeType != XML_ELEMENT_NODE) { if ($p) { $style->inherit($p->get_style()); } $frame->set_style($style); continue; } $id = $frame->get_id(); // Handle HTML 4.0 attributes AttributeTranslator::translate_attributes($frame); if (($str = $frame->get_node()->getAttribute(AttributeTranslator::$_style_attr)) !== "") { $styles[$id][self::SPEC_NON_CSS][] = $this->_parse_properties($str); } // Locate any additional style attributes if (($str = $frame->get_node()->getAttribute("style")) !== "") { // Destroy CSS comments $str = preg_replace("'/\.?\/'si", "", $str); $spec = $this->_specificity("!attr", self::ORIG_AUTHOR); $styles[$id][$spec][] = $this->_parse_properties($str); } // Grab the applicable styles if (isset($styles[$id])) { /** @var array[][] $applied_styles / $applied_styles = $styles[$id]; // Sort by specificity ksort($applied_styles); if ($DEBUGCSS) { $debug_nodename = $frame->get_node()->nodeName; print "<pre>\n[$debug_nodename\n"; foreach ($applied_styles as $spec => $arr) { printf("specificity: 0x%08x\n", $spec); /* @var Style $s / foreach ($arr as $s) { print "[\n"; $s->debug_print(); print "]\n"; } } } // Merge the new styles with the inherited styles $acceptedmedia = self::$ACCEPTED_GENERIC_MEDIA_TYPES; $acceptedmedia[] = $this->_dompdf->getOptions()->getDefaultMediaType(); foreach ($applied_styles as $arr) { /* @var Style $s / foreach ($arr as $s) { $media_queries = $s->get_media_queries(); foreach ($media_queries as $media_query) { list($media_query_feature, $media_query_value) = $media_query; // if any of the Style's media queries fail then do not apply the style //TODO: When the media query logic is fully developed we should not apply the Style when any of the media queries fail or are bad, per https://www.w3.org/TR/css3-mediaqueries/#error-handling if (in_array($media_query_feature, self::$VALID_MEDIA_TYPES)) { if ((strlen($media_query_feature) === 0 && !in_array($media_query, $acceptedmedia)) \|\| (in_array($media_query, $acceptedmedia) && $media_query_value == "not")) { continue (3); } } else { switch ($media_query_feature) { case "height": if ($paper_height !== (float)$style->length_in_pt($media_query_value)) { continue (3); } break; case "min-height": if ($paper_height < (float)$style->length_in_pt($media_query_value)) { continue (3); } break; case "max-height": if ($paper_height > (float)$style->length_in_pt($media_query_value)) { continue (3); } break; case "width": if ($paper_width !== (float)$style->length_in_pt($media_query_value)) { continue (3); } break; case "min-width": //if (min($paper_width, $media_query_width) === $paper_width) { if ($paper_width < (float)$style->length_in_pt($media_query_value)) { continue (3); } break; case "max-width": //if (max($paper_width, $media_query_width) === $paper_width) { if ($paper_width > (float)$style->length_in_pt($media_query_value)) { continue (3); } break; case "orientation": if ($paper_orientation !== $media_query_value) { continue (3); } break; default: Helpers::record_warnings(E_USER_WARNING, "Unknown media query: $media_query_feature", __FILE__, __LINE__); break; } } } $style->merge($s); } } } // Inherit parent's styles if parent exists if ($p) { if ($DEBUGCSS) { print "inherit:\n"; print "[\n"; $p->get_style()->debug_print(); print "]\n"; } $style->inherit($p->get_style()); } if ($DEBUGCSS) { print "DomElementStyle:\n"; print "[\n"; $style->debug_print(); print "]\n"; print "/$debug_nodename]\n</pre>"; } /DEBUGCSS print: see below different print debugging method Helpers::pre_r($frame->get_node()->nodeName . ":"); echo "<pre>"; echo $style; echo "</pre>";/ $frame->set_style($style); if (!$root_flg && $this->_page_styles["base"]) { $root_flg = true; // set the page width, height, and orientation based on the parsed page style if ($style->size !== "auto") { list($paper_width, $paper_height) = $style->size; } $paper_width = $paper_width - (float)$style->length_in_pt($style->margin_left) - (float)$style->length_in_pt($style->margin_right); $paper_height = $paper_height - (float)$style->length_in_pt($style->margin_top) - (float)$style->length_in_pt($style->margin_bottom); $paper_orientation = ($paper_width > $paper_height ? "landscape" : "portrait"); } } // We're done! Clean out the registry of all styles since we // won't be needing this later. foreach (array_keys($this->_styles) as $key) { $this->_styles[$key] = null; unset($this->_styles[$key]); } } /* * parse a CSS string using a regex parser * Called by {@link Stylesheet::parse_css()} * * @param string $str * * @throws Exception / private function _parse_css($str) { $str = trim($str); // Destroy comments and remove HTML comments $css = preg_replace(array( "'/\.?\/'si", "/^<!--/", "/-->$/" ), "", $str); // FIXME: handle '{' within strings, e.g. [attr="string {}"] // Something more legible: $re = "/\s* # Skip leading whitespace \n" . "( @([^\s{]+)\s([^{;]) (?:;\|({)) )? # Match @rules followed by ';' or '{' \n" . "(?(1) # Only parse sub-sections if we're in an @rule... \n" . " (?(4) # ...and if there was a leading '{' \n" . " \s( (?:(?>[^{}]+) ({)? # Parse rulesets and individual @page rules \n" . " (?(6) (?>[^}]) }) \s)+? \n" . " ) \n" . " }) # Balancing '}' \n" . "\| # Branch to match regular rules (not preceded by '@') \n" . "([^{]{[^}]})) # Parse normal rulesets \n" . "/xs"; if (preg_match_all($re, $css, $matches, PREG_SET_ORDER) === false) { // An error occurred throw new Exception("Error parsing css file: preg_match_all() failed."); } // After matching, the array indices 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 // $media_query_regex = "/(?:((only\|not)?\s(" . implode("\|", self::$VALID_MEDIA_TYPES) . "))\|(\s\(\s((?:(min\|max)-)?([\w\-]+))\s(?:\:\s(.?)\s)?\)))/isx"; //Helpers::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": $acceptedmedia = self::$ACCEPTED_GENERIC_MEDIA_TYPES; $acceptedmedia[] = $this->_dompdf->getOptions()->getDefaultMediaType(); $media_queries = preg_split("/\s,\s/", mb_strtolower(trim($match[3]))); foreach ($media_queries as $media_query) { if (in_array($media_query, $acceptedmedia)) { //if we have a media type match go ahead and parse the stylesheet $this->_parse_sections($match[5]); break; } elseif (!in_array($media_query, self::$VALID_MEDIA_TYPES)) { // otherwise conditionally parse the stylesheet assuming there are parseable media queries if (preg_match_all($media_query_regex, $media_query, $media_query_matches, PREG_SET_ORDER) !== false) { $mq = array(); foreach ($media_query_matches as $media_query_match) { if (empty($media_query_match[1]) === false) { $media_query_feature = strtolower($media_query_match[3]); $media_query_value = strtolower($media_query_match[2]); $mq[] = array($media_query_feature, $media_query_value); } else if (empty($media_query_match[4]) === false) { $media_query_feature = strtolower($media_query_match[5]); $media_query_value = (array_key_exists(8, $media_query_match) ? strtolower($media_query_match[8]) : null); $mq[] = array($media_query_feature, $media_query_value); } } $this->_parse_sections($match[5], $mq); break; } } } break; case "page": //This handles @page to be applied to page oriented media //Note: This has a reduced syntax: //@page { margin:1cm; color:blue; } //Not a sequence of styles like a full.css, but only the properties //of a single style, which is applied to the very first "root" frame before //processing other styles of the frame. //Working properties: // margin (for margin around edge of paper) // font-family (default font of pages) // color (default text color of pages) //Non working properties: // border // padding // background-color //Todo:Reason is unknown //Other properties (like further font or border attributes) not tested. //If a border or background color around each paper sheet is desired, //assign it to the <body> tag, possibly only for the css of the correct media type. // If the page has a name, skip the style. $page_selector = trim($match[3]); $key = null; switch ($page_selector) { case "": $key = "base"; break; case ":left": case ":right": case ":odd": case ":even": /** @noinspection PhpMissingBreakStatementInspection / case ":first": $key = $page_selector; break; default: break 2; } // Store the style for later... if (empty($this->_page_styles[$key])) { $this->_page_styles[$key] = $this->_parse_properties($match[5]); } else { $this->_page_styles[$key]->merge($this->_parse_properties($match[5])); } break; case "font-face": $this->_parse_font_face($match[5]); break; default: // ignore everything else break; } continue; } if ($match[7] !== "") { $this->_parse_sections($match[7]); } } } /* * See also style.cls Style::_image(), refactoring?, works also for imported css files * * @param $val * @return string / protected function _image($val) { $DEBUGCSS = $this->_dompdf->getOptions()->getDebugCss(); $parsed_url = "none"; if (mb_strpos($val, "url") === false) { $path = "none"; //Don't resolve no image -> otherwise would prefix path and no longer recognize as none } else { $val = preg_replace("/url\(\s['\"]?([^'\")]+)['\"]?\s\)/", "\\1", trim($val)); // Resolve the url now in the context of the current stylesheet $parsed_url = Helpers::explode_url($val); if ($parsed_url["protocol"] == "" && $this->get_protocol() == "") { if ($parsed_url["path"][0] === '/' \|\| $parsed_url["path"][0] === '\\') { $path = $_SERVER["DOCUMENT_ROOT"] . '/'; } else { $path = $this->get_base_path(); } $path .= $parsed_url["path"] . $parsed_url["file"]; $path = realpath($path); // If realpath returns FALSE then specifically state that there is no background image // FIXME: Is this causing problems for imported CSS files? There are some './none' references when running the test cases. if (!$path) { $path = 'none'; } } else { $path = Helpers::build_url($this->get_protocol(), $this->get_host(), $this->get_base_path(), $val); } } if ($DEBUGCSS) { print "<pre>[_image\n"; print_r($parsed_url); print $this->get_protocol() . "\n" . $this->get_base_path() . "\n" . $path . "\n"; print "_image]</pre>";; } return $path; } /* * parse @import{} sections * * @param string $url the url of the imported CSS file / private function _parse_import($url) { $arr = preg_split("/[\s\n,]/", $url, -1, PREG_SPLIT_NO_EMPTY); $url = array_shift($arr); $accept = false; if (count($arr) > 0) { $acceptedmedia = self::$ACCEPTED_GENERIC_MEDIA_TYPES; $acceptedmedia[] = $this->_dompdf->getOptions()->getDefaultMediaType(); // @import url media_type [media_type...] foreach ($arr as $type) { if (in_array(mb_strtolower(trim($type)), $acceptedmedia)) { $accept = true; break; } } } else { // unconditional import $accept = true; } if ($accept) { // Store our current base url properties in case the new url is elsewhere $protocol = $this->_protocol; $host = $this->_base_host; $path = $this->_base_path; // $url = str_replace(array('"',"url", "(", ")"), "", $url); // If the protocol is php, assume that we will import using file:// // $url = Helpers::build_url($protocol == "php://" ? "file://" : $protocol, $host, $path, $url); // Above does not work for subfolders and absolute urls. // Todo: As above, do we need to replace php or file to an empty protocol for local files? $url = $this->_image($url); $this->load_css_file($url); // Restore the current base url $this->_protocol = $protocol; $this->_base_host = $host; $this->_base_path = $path; } } /* * parse @font-face{} sections * http://www.w3.org/TR/css3-fonts/#the-font-face-rule * * @param string $str CSS @font-face rules / private function _parse_font_face($str) { $descriptors = $this->_parse_properties($str); preg_match_all("/(url\|local)\s\([\"\']?([^\"\'\)]+)[\"\']?\)\s(format\s\([\"\']?([^\"\'\)]+)[\"\']?\))?/i", $descriptors->src, $src); $sources = array(); $valid_sources = array(); foreach ($src[0] as $i => $value) { $source = array( "local" => strtolower($src[1][$i]) === "local", "uri" => $src[2][$i], "format" => strtolower($src[4][$i]), "path" => Helpers::build_url($this->_protocol, $this->_base_host, $this->_base_path, $src[2][$i]), ); if (!$source["local"] && in_array($source["format"], array("", "truetype"))) { $valid_sources[] = $source; } $sources[] = $source; } // No valid sources if (empty($valid_sources)) { return; } $style = array( "family" => $descriptors->get_font_family_raw(), "weight" => $descriptors->font_weight, "style" => $descriptors->font_style, ); $this->getFontMetrics()->registerFont($style, $valid_sources[0]["path"], $this->_dompdf->getHttpContext()); } /** * 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 = preg_split("/;(?=(?:[^\(]\([^\)]\))(?![^\)]\)))/", $str); $DEBUGCSS = $this->_dompdf->getOptions()->getDebugCss(); if ($DEBUGCSS) { print '[_parse_properties'; } // Create the style $style = new Style($this, Stylesheet::ORIG_AUTHOR); foreach ($properties as $prop) { // If the $prop contains an url, the regex may be wrong // @todo: fix the regex so that it works every time /if (strpos($prop, "url(") === false) { if (preg_match("/([a-z-]+)\s:\s[^:]+$/i", $prop, $m)) $prop = $m[0]; }/ //A css property can have " ! important" appended (whitespace optional) //strip this off to decode core of the property correctly. //Pass on in the style to allow proper handling: //!important properties can only be overridden by other !important ones. //$style->$prop_name = is a shortcut of $style->__set($prop_name,$value);. //If no specific set function available, set _props["prop_name"] //style is always copied completely, or $_props handled separately //Therefore set a _important_props["prop_name"]=true to indicate the modifier / Instead of short code, prefer the typical case with fast code $important = preg_match("/(.?)!\simportant/",$prop,$match); if ( $important ) { $prop = $match[1]; } $prop = trim($prop); / if ($DEBUGCSS) print '('; $important = false; $prop = trim($prop); if (substr($prop, -9) === 'important') { $prop_tmp = rtrim(substr($prop, 0, -9)); if (substr($prop_tmp, -1) === '!') { $prop = rtrim(substr($prop_tmp, 0, -1)); $important = true; } } if ($prop === "") { if ($DEBUGCSS) print 'empty)'; continue; } $i = mb_strpos($prop, ":"); if ($i === false) { if ($DEBUGCSS) print 'novalue' . $prop . ')'; continue; } $prop_name = rtrim(mb_strtolower(mb_substr($prop, 0, $i))); $value = ltrim(mb_substr($prop, $i + 1)); if ($DEBUGCSS) print $prop_name . ':=' . $value . ($important ? '!IMPORTANT' : '') . ')'; //New style, anyway empty //if ($important \|\| !$style->important_get($prop_name) ) { //$style->$prop_name = array($value,$important); //assignment might be replaced by overloading through __set, //and overloaded functions might check _important_props, //therefore set _important_props first. if ($important) { $style->important_set($prop_name); } //For easier debugging, don't use overloading of assignments with __set $style->$prop_name = $value; //$style->props_set($prop_name, $value); } if ($DEBUGCSS) print '_parse_properties]'; return $style; } /* * parse selector + rulesets * * @param string $str CSS selectors and rulesets * @param array $media_queries / private function _parse_sections($str, $media_queries = array()) { // Pre-process: collapse all whitespace and strip whitespace around '>', // '.', ':', '+', '#' $patterns = array("/[\\s\n]+/", "/\\s+([>.:+#])\\s+/"); $replacements = array(" ", "\\1"); $str = preg_replace($patterns, $replacements, $str); $DEBUGCSS = $this->_dompdf->getOptions()->getDebugCss(); $sections = explode("}", $str); if ($DEBUGCSS) print '[_parse_sections'; foreach ($sections as $sect) { $i = mb_strpos($sect, "{"); if ($i === false) { continue; } //$selectors = explode(",", mb_substr($sect, 0, $i)); $selectors = preg_split("/,(?![^\(]\))/", mb_substr($sect, 0, $i), 0, PREG_SPLIT_NO_EMPTY); if ($DEBUGCSS) print '[section'; $style = $this->_parse_properties(trim(mb_substr($sect, $i + 1))); // Assign it to the selected elements foreach ($selectors as $selector) { $selector = trim($selector); if ($selector == "") { if ($DEBUGCSS) print '#empty#'; continue; } if ($DEBUGCSS) print '#' . $selector . '#'; //if ($DEBUGCSS) { if (strpos($selector,'p') !== false) print '!!!p!!!#'; } //FIXME: tag the selector with a hash of the media query to separate it from non-conditional styles (?), xpath comments are probably not what we want to do here if (count($media_queries) > 0) { $style->set_media_queries($media_queries); } $this->add_style($selector, $style); } if ($DEBUGCSS) { print 'section]'; } } if ($DEBUGCSS) { print '_parse_sections]'; } } /** * @return string / public static function getDefaultStylesheet() { $dir = realpath(__DIR__ . "/../.."); return $dir . self::DEFAULT_STYLESHEET; } /* * @param FontMetrics $fontMetrics * @return $this / public function setFontMetrics(FontMetrics $fontMetrics) { $this->fontMetrics = $fontMetrics; return $this; } /* * @return FontMetrics / public function getFontMetrics() { return $this->fontMetrics; } /* * 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 => $selector_styles) { /* @var Style $style */ foreach ($selector_styles as $style) { $str .= "$selector => " . $style->__toString() . "\n"; } } return $str; } } Back

Edit File : Stylesheet.php | Size : 62.35 KB

<?php
/**
 * @package dompdf
 * @link    http://dompdf.github.com/
 * @author  Benj Carson <benjcarson@digitaljunkies.ca>
 * @author  Helmut Tischer <htischer@weihenstephan.org>
 * @author  Fabien Ménager <fabien.menager@gmail.com>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 */
namespace Dompdf\Css;

use DOMElement;
use DOMXPath;
use Dompdf\Dompdf;
use Dompdf\Helpers;
use Dompdf\Exception;
use Dompdf\FontMetrics;
use Dompdf\Frame\FrameTree;

/**
 * The master stylesheet class
 *
 * The Stylesheet class is responsible for parsing stylesheets and style
 * tags/attributes.  It also acts as a registry of the individual Style
 * objects generated by the current set of loaded CSS files and style
 * elements.
 *
 * @see Style
 * @package dompdf
 */
class Stylesheet
{
    /**
     * The location of the default built-in CSS file.
     */
    const DEFAULT_STYLESHEET = "/lib/res/html.css";

/**
     * User agent stylesheet origin
     *
     * @var int
     */
    const ORIG_UA = 1;

/**
     * User normal stylesheet origin
     *
     * @var int
     */
    const ORIG_USER = 2;

/**
     * Author normal stylesheet origin
     *
     * @var int
     */
    const ORIG_AUTHOR = 3;

/*
     * The highest possible specificity is 0x01000000 (and that is only for author
     * stylesheets, as it is for inline styles). Origin precedence can be achieved by
     * adding multiples of 0x10000000 to the actual specificity. Important
     * declarations are handled in Style; though technically they should be handled
     * here so that user important declarations can be made to take precedence over
     * user important declarations, this doesn't matter in practice as Dompdf does
     * not support user stylesheets, and user agent stylesheets can not include
     * important declarations.
     */
    private static $_stylesheet_origins = array(
        self::ORIG_UA => 0x00000000, // user agent declarations
        self::ORIG_USER => 0x10000000, // user normal declarations
        self::ORIG_AUTHOR => 0x30000000, // author normal declarations
    );

/*
     * Non-CSS presentational hints (i.e. HTML 4 attributes) are handled as if added
     * to the beginning of an author stylesheet, i.e. anything in author stylesheets
     * should override them.
     */
    const SPEC_NON_CSS = 0x20000000;

/**
     * Current dompdf instance
     *
     * @var Dompdf
     */
    private $_dompdf;

/**
     * Array of currently defined styles
     *
     * @var Style[]
     */
    private $_styles;

/**
     * Base protocol of the document being parsed
     * Used to handle relative urls.
     *
     * @var string
     */
    private $_protocol;

/**
     * Base hostname of the document being parsed
     * Used to handle relative urls.
     *
     * @var string
     */
    private $_base_host;

/**
     * Base path of the document being parsed
     * Used to handle relative urls.
     *
     * @var string
     */
    private $_base_path;

/**
     * The styles defined by @page rules
     *
     * @var array<Style>
     */
    private $_page_styles;

/**
     * List of loaded files, used to prevent recursion
     *
     * @var array
     */
    private $_loaded_files;

/**
     * Current stylesheet origin
     *
     * @var int
     */
    private $_current_origin = self::ORIG_UA;

/**
     * Accepted CSS media types
     * List of types and parsing rules for future extensions:
     * http://www.w3.org/TR/REC-html40/types.html
     *   screen, tty, tv, projection, handheld, print, braille, aural, all
     * The following are non standard extensions for undocumented specific environments.
     *   static, visual, bitmap, paged, dompdf
     * Note, even though the generated pdf file is intended for print output,
     * the desired content might be different (e.g. screen or projection view of html file).
     * Therefore allow specification of content by dompdf setting Options::defaultMediaType.
     * If given, replace media "print" by Options::defaultMediaType.
     * (Previous version $ACCEPTED_MEDIA_TYPES = $ACCEPTED_GENERIC_MEDIA_TYPES + $ACCEPTED_DEFAULT_MEDIA_TYPE)
     */
    static $ACCEPTED_DEFAULT_MEDIA_TYPE = "print";
    static $ACCEPTED_GENERIC_MEDIA_TYPES = array("all", "static", "visual", "bitmap", "paged", "dompdf");
    static $VALID_MEDIA_TYPES = array("all", "aural", "bitmap", "braille", "dompdf", "embossed", "handheld", "paged", "print", "projection", "screen", "speech", "static", "tty", "tv", "visual");

/**
     * @var FontMetrics
     */
    private $fontMetrics;

/**
     * The class constructor.
     *
     * The base protocol, host & path are initialized to those of
     * the current script.
     */
    function __construct(Dompdf $dompdf)
    {
        $this->_dompdf = $dompdf;
        $this->setFontMetrics($dompdf->getFontMetrics());
        $this->_styles = array();
        $this->_loaded_files = array();
        $script = __FILE__;
        if(isset($_SERVER["SCRIPT_FILENAME"])){
            $script = $_SERVER["SCRIPT_FILENAME"];
        }
        list($this->_protocol, $this->_base_host, $this->_base_path) = Helpers::explode_url($script);
        $this->_page_styles = array("base" => new Style($this));
    }

/**
     * Set the base protocol
     *
     * @param string $protocol
     */
    function set_protocol($protocol)
    {
        $this->_protocol = $protocol;
    }

/**
     * Set the base host
     *
     * @param string $host
     */
    function set_host($host)
    {
        $this->_base_host = $host;
    }

/**
     * Set the base path
     *
     * @param string $path
     */
    function set_base_path($path)
    {
        $this->_base_path = $path;
    }

/**
     * Return the Dompdf object
     *
     * @return Dompdf
     */
    function get_dompdf()
    {
        return $this->_dompdf;
    }

/**
     * Return the base protocol for this stylesheet
     *
     * @return string
     */
    function get_protocol()
    {
        return $this->_protocol;
    }

/**
     * Return the base host for this stylesheet
     *
     * @return string
     */
    function get_host()
    {
        return $this->_base_host;
    }

/**
     * Return the base path for this stylesheet
     *
     * @return string
     */
    function get_base_path()
    {
        return $this->_base_path;
    }

/**
     * Return the array of page styles
     *
     * @return Style[]
     */
    function get_page_styles()
    {
        return $this->_page_styles;
    }

/**
     * Add a new Style object to the stylesheet
     * add_style() adds a new Style object to the current stylesheet, or
     * merges a new Style with an existing one.
     *
     * @param string $key the Style's selector
     * @param Style $style the Style to be added
     *
     * @throws \Dompdf\Exception
     */
    function add_style($key, Style $style)
    {
        if (!is_string($key)) {
            throw new Exception("CSS rule must be keyed by a string.");
        }

if (!isset($this->_styles[$key])) {
            $this->_styles[$key] = array();
        }
        $new_style = clone $style;
        $new_style->set_origin($this->_current_origin);
        $this->_styles[$key][] = $new_style;
    }

/**
     * lookup a specific Style collection
     *
     * lookup() returns the Style collection specified by $key, or null if the Style is
     * not found.
     *
     * @param string $key the selector of the requested Style
     * @return Style
     *
     * @Fixme _styles is a two dimensional array. It should produce wrong results
     */
    function lookup($key)
    {
        if (!isset($this->_styles[$key])) {
            return null;
        }

return $this->_styles[$key];
    }

/**
     * create a new Style object associated with this stylesheet
     *
     * @param Style $parent The style of this style's parent in the DOM tree
     * @return Style
     */
    function create_style(Style $parent = null)
    {
        if ($parent == null) {
            $parent = $this;
        }
        return new Style($parent, $this->_current_origin);
    }

/**
     * load and parse a CSS string
     *
     * @param string $css
     * @param int $origin
     */
    function load_css(&$css, $origin = self::ORIG_AUTHOR)
    {
        if ($origin) {
            $this->_current_origin = $origin;
        }
        $this->_parse_css($css);
    }

/**
     * load and parse a CSS file
     *
     * @param string $file
     * @param int $origin
     */
    function load_css_file($file, $origin = self::ORIG_AUTHOR)
    {
        if ($origin) {
            $this->_current_origin = $origin;
        }

// Prevent circular references
        if (isset($this->_loaded_files[$file])) {
            return;
        }

$this->_loaded_files[$file] = true;

if (strpos($file, "data:") === 0) {
            $parsed = Helpers::parse_data_uri($file);
            $css = $parsed["data"];
        } else {
            $parsed_url = Helpers::explode_url($file);

list($this->_protocol, $this->_base_host, $this->_base_path, $filename) = $parsed_url;

// Fix submitted by Nick Oostveen for aliased directory support:
            if ($this->_protocol == "") {
                $file = $this->_base_path . $filename;
            } else {
                $file = Helpers::build_url($this->_protocol, $this->_base_host, $this->_base_path, $filename);
            }

list($css, $http_response_header) = Helpers::getFileContent($file, $this->_dompdf->getHttpContext());

$good_mime_type = true;

// See http://the-stickman.com/web-development/php/getting-http-response-headers-when-using-file_get_contents/
            if (isset($http_response_header) && !$this->_dompdf->getQuirksmode()) {
                foreach ($http_response_header as $_header) {
                    if (preg_match("@Content-Type:\s*([\w/]+)@i", $_header, $matches) &&
                        ($matches[1] !== "text/css")
                    ) {
                        $good_mime_type = false;
                    }
                }
            }

if (!$good_mime_type || empty($css)) {
                Helpers::record_warnings(E_USER_WARNING, "Unable to load css file $file", __FILE__, __LINE__);
                return;
            }
        }

$this->_parse_css($css);
    }

/**
     * @link http://www.w3.org/TR/CSS21/cascade.html#specificity
     *
     * @param string $selector
     * @param int $origin :
     *    - Stylesheet::ORIG_UA: user agent style sheet
     *    - Stylesheet::ORIG_USER: user style sheet
     *    - Stylesheet::ORIG_AUTHOR: author style sheet
     *
     * @return int
     */
    private function _specificity($selector, $origin = self::ORIG_AUTHOR)
    {
        // http://www.w3.org/TR/CSS21/cascade.html#specificity
        // ignoring the ":" pseudoclass modifiers
        // also ignored in _css_selector_to_xpath

$a = ($selector === "!attr") ? 1 : 0;

$b = min(mb_substr_count($selector, "#"), 255);

$c = min(mb_substr_count($selector, ".") +
            mb_substr_count($selector, "["), 255);

$d = min(mb_substr_count($selector, " ") +
            mb_substr_count($selector, ">") +
            mb_substr_count($selector, "+"), 255);

//If a normal element name is at the beginning of the string,
        //a leading whitespace might have been removed on whitespace collapsing and removal
        //therefore there might be one whitespace less as selected element names
        //this can lead to a too small specificity
        //see _css_selector_to_xpath

if (!in_array($selector[0], array(" ", ">", ".", "#", "+", ":", "[")) && $selector !== "*") {
            $d++;
        }

if ($this->_dompdf->getOptions()->getDebugCss()) {
            /*DEBUGCSS*/
            print "<pre>\n";
            /*DEBUGCSS*/
            printf("_specificity(): 0x%08x \"%s\"\n", self::$_stylesheet_origins[$origin] + (($a << 24) | ($b << 16) | ($c << 8) | ($d)), $selector);
            /*DEBUGCSS*/
            print "</pre>";
        }

return self::$_stylesheet_origins[$origin] + (($a << 24) | ($b << 16) | ($c << 8) | ($d));
    }

/**
     * Converts a CSS selector to an XPath query.
     *
     * @param string $selector
     * @param bool $first_pass
     *
     * @throws Exception
     * @return array
     */
    private function _css_selector_to_xpath($selector, $first_pass = false)
    {

// Collapse white space and strip whitespace around delimiters
        //$search = array("/\\s+/", "/\\s+([.>#+:])\\s+/");
        //$replace = array(" ", "\\1");
        //$selector = preg_replace($search, $replace, trim($selector));

// Initial query (non-absolute)
        $query = "//";

// Will contain :before and :after
        $pseudo_elements = array();

// Will contain :link, etc
        $pseudo_classes = array();

// Parse the selector
        //$s = preg_split("/([ :>.#+])/", $selector, -1, PREG_SPLIT_DELIM_CAPTURE);

$delimiters = array(" ", ">", ".", "#", "+", ":", "[", "(");

// Add an implicit * at the beginning of the selector
        // if it begins with an attribute selector
        if ($selector[0] === "[") {
            $selector = "*$selector";
        }

// Add an implicit space at the beginning of the selector if there is no
        // delimiter there already.
        if (!in_array($selector[0], $delimiters)) {
            $selector = " $selector";
        }

$tok = "";
        $len = mb_strlen($selector);
        $i = 0;

while ($i < $len) {

$s = $selector[$i];
            $i++;

// Eat characters up to the next delimiter
            $tok = "";
            $in_attr = false;
            $in_func = false;

while ($i < $len) {
                $c = $selector[$i];
                $c_prev = $selector[$i - 1];

if (!$in_func && !$in_attr && in_array($c, $delimiters) && !(($c == $c_prev) == ":")) {
                    break;
                }

if ($c_prev === "[") {
                    $in_attr = true;
                }
                if ($c_prev === "(") {
                    $in_func = true;
                }

$tok .= $selector[$i++];

if ($in_attr && $c === "]") {
                    $in_attr = false;
                    break;
                }
                if ($in_func && $c === ")") {
                    $in_func = false;
                    break;
                }
            }

switch ($s) {

case " ":
                case ">":
                    // All elements matching the next token that are direct children of
                    // the current token
                    $expr = $s === " " ? "descendant" : "child";

if (mb_substr($query, -1, 1) !== "/") {
                        $query .= "/";
                    }

// Tag names are case-insensitive
                    $tok = strtolower($tok);

if (!$tok) {
                        $tok = "*";
                    }

$query .= "$expr::$tok";
                    $tok = "";
                    break;

case ".":
                case "#":
                    // All elements matching the current token with a class/id equal to
                    // the _next_ token.

$attr = $s === "." ? "class" : "id";

// empty class/id == *
                    if (mb_substr($query, -1, 1) === "/") {
                        $query .= "*";
                    }

// Match multiple classes: $tok contains the current selected
                    // class.  Search for class attributes with class="$tok",
                    // class=".* $tok .*" and class=".* $tok"

// This doesn't work because libxml only supports XPath 1.0...
                    //$query .= "[matches(@$attr,\"^${tok}\$|^${tok}[ ]+|[ ]+${tok}\$|[ ]+${tok}[ ]+\")]";

// Query improvement by Michael Sheakoski <michael@mjsdigital.com>:
                    $query .= "[contains(concat(' ', @$attr, ' '), concat(' ', '$tok', ' '))]";
                    $tok = "";
                    break;

case "+":
                    // All sibling elements that follow the current token
                    if (mb_substr($query, -1, 1) !== "/") {
                        $query .= "/";
                    }

$query .= "following-sibling::$tok";
                    $tok = "";
                    break;

case ":":
                    $i2 = $i - strlen($tok) - 2; // the char before ":"
                    if (($i2 < 0 || !isset($selector[$i2]) || (in_array($selector[$i2], $delimiters) && $selector[$i2] != ":")) && substr($query, -1) != "*") {
                        $query .= "*";
                    }

$last = false;

// Pseudo-classes
                    switch ($tok) {

case "first-child":
                            $query .= "[1]";
                            $tok = "";
                            break;

case "last-child":
                            $query .= "[not(following-sibling::*)]";
                            $tok = "";
                            break;

case "first-of-type":
                            $query .= "[position() = 1]";
                            $tok = "";
                            break;

case "last-of-type":
                            $query .= "[position() = last()]";
                            $tok = "";
                            break;

// an+b, n, odd, and even
                        /** @noinspection PhpMissingBreakStatementInspection */
                        case "nth-last-of-type":
                            $last = true;
                        case "nth-of-type":
                            //FIXME: this fix-up is pretty ugly, would parsing the selector in reverse work better generally?
                            $descendant_delimeter = strrpos($query, "::");
                            $isChild = substr($query, $descendant_delimeter-5, 5) == "child";
                            $el = substr($query, $descendant_delimeter+2);
                            $query = substr($query, 0, strrpos($query, "/")) . ($isChild ? "/" : "//") . $el;

$pseudo_classes[$tok] = true;
                            $p = $i + 1;
                            $nth = trim(mb_substr($selector, $p, strpos($selector, ")", $i) - $p));

// 1
                            if (preg_match("/^\d+$/", $nth)) {
                                $condition = "position() = $nth";
                            } // odd
                            elseif ($nth === "odd") {
                                $condition = "(position() mod 2) = 1";
                            } // even
                            elseif ($nth === "even") {
                                $condition = "(position() mod 2) = 0";
                            } // an+b
                            else {
                                $condition = $this->_selector_an_plus_b($nth, $last);
                            }

$query .= "[$condition]";
                            $tok = "";
                            break;
                        /** @noinspection PhpMissingBreakStatementInspection */
                        case "nth-last-child":
                            $last = true;
                        case "nth-child":
                            //FIXME: this fix-up is pretty ugly, would parsing the selector in reverse work better generally?
                            $descendant_delimeter = strrpos($query, "::");
                            $isChild = substr($query, $descendant_delimeter-5, 5) == "child";
                            $el = substr($query, $descendant_delimeter+2);
                            $query = substr($query, 0, strrpos($query, "/")) . ($isChild ? "/" : "//") . "*";

$pseudo_classes[$tok] = true;
                            $p = $i + 1;
                            $nth = trim(mb_substr($selector, $p, strpos($selector, ")", $i) - $p));

$query .= "[$condition]";
                            if ($el != "*") {
                                $query .= "[name() = '$el']";
                            }
                            $tok = "";
                            break;

//TODO: bit of a hack attempt at matches support, currently only matches against elements
                        case "matches":
                            $pseudo_classes[$tok] = true;
                            $p = $i + 1;
                            $matchList = trim(mb_substr($selector, $p, strpos($selector, ")", $i) - $p));

// Tag names are case-insensitive
                            $elements = array_map("trim", explode(",", strtolower($matchList)));
                            foreach ($elements as &$element) {
                                $element = "name() = '$element'";
                            }

$query .= "[" . implode(" or ", $elements) . "]";
                            $tok = "";
                            break;

case "link":
                            $query .= "[@href]";
                            $tok = "";
                            break;

case "first-line":
                        case ":first-line":
                        case "first-letter":
                        case ":first-letter":
                            // TODO
                            $el = trim($tok, ":");
                            $pseudo_elements[$el] = true;
                            break;

// N/A
                        case "focus":
                        case "active":
                        case "hover":
                        case "visited":
                            $query .= "[false()]";
                            $tok = "";
                            break;

/* Pseudo-elements */
                        case "before":
                        case ":before":
                        case "after":
                        case ":after":
                            $pos = trim($tok, ":");
                            $pseudo_elements[$pos] = true;
                            if (!$first_pass) {
                                $query .= "/*[@$pos]";
                            }

$tok = "";
                            break;

case "empty":
                            $query .= "[not(*) and not(normalize-space())]";
                            $tok = "";
                            break;

case "disabled":
                        case "checked":
                            $query .= "[@$tok]";
                            $tok = "";
                            break;

case "enabled":
                            $query .= "[not(@disabled)]";
                            $tok = "";
                            break;

// the selector is not handled, until we support all possible selectors force an empty set (silent failure)
                        default:
                            $query = "/../.."; // go up two levels because generated content starts on the body element
                            $tok = "";
                            break;
                    }

break;

case "[":
                    // Attribute selectors.  All with an attribute matching the following token(s)
                    $attr_delimiters = array("=", "]", "~", "|", "$", "^", "*");
                    $tok_len = mb_strlen($tok);
                    $j = 0;

$attr = "";
                    $op = "";
                    $value = "";

while ($j < $tok_len) {
                        if (in_array($tok[$j], $attr_delimiters)) {
                            break;
                        }
                        $attr .= $tok[$j++];
                    }

switch ($tok[$j]) {

case "~":
                        case "|":
                        case "$":
                        case "^":
                        case "*":
                            $op .= $tok[$j++];

if ($tok[$j] !== "=") {
                                throw new Exception("Invalid CSS selector syntax: invalid attribute selector: $selector");
                            }

$op .= $tok[$j];
                            break;

case "=":
                            $op = "=";
                            break;

}

// Read the attribute value, if required
                    if ($op != "") {
                        $j++;
                        while ($j < $tok_len) {
                            if ($tok[$j] === "]") {
                                break;
                            }
                            $value .= $tok[$j++];
                        }
                    }

if ($attr == "") {
                        throw new Exception("Invalid CSS selector syntax: missing attribute name");
                    }

$value = trim($value, "\"'");

switch ($op) {

case "":
                            $query .= "[@$attr]";
                            break;

case "=":
                            $query .= "[@$attr=\"$value\"]";
                            break;

case "~=":
                            // FIXME: this will break if $value contains quoted strings
                            // (e.g. [type~="a b c" "d e f"])
                            $values = explode(" ", $value);
                            $query .= "[";

foreach ($values as $val) {
                                $query .= "@$attr=\"$val\" or ";
                            }

$query = rtrim($query, " or ") . "]";
                            break;

case "|=":
                            $values = explode("-", $value);
                            $query .= "[";

foreach ($values as $val) {
                                $query .= "starts-with(@$attr, \"$val\") or ";
                            }

$query = rtrim($query, " or ") . "]";
                            break;

case "$=":
                            $query .= "[substring(@$attr, string-length(@$attr)-" . (strlen($value) - 1) . ")=\"$value\"]";
                            break;

case "^=":
                            $query .= "[starts-with(@$attr,\"$value\")]";
                            break;

case "*=":
                            $query .= "[contains(@$attr,\"$value\")]";
                            break;
                    }

break;
            }
        }
        $i++;

//       case ":":
//         // Pseudo selectors: ignore for now.  Partially handled directly
//         // below.

//         // Skip until the next special character, leaving the token as-is
//         while ( $i < $len ) {
//           if ( in_array($selector[$i], $delimiters) )
//             break;
//           $i++;
//         }
//         break;

//       default:
//         // Add the character to the token
//         $tok .= $selector[$i++];
//         break;
//       }

//    }

// Trim the trailing '/' from the query
        if (mb_strlen($query) > 2) {
            $query = rtrim($query, "/");
        }

return array("query" => $query, "pseudo_elements" => $pseudo_elements);
    }

/**
     * https://github.com/tenderlove/nokogiri/blob/master/lib/nokogiri/css/xpath_visitor.rb
     *
     * @param $expr
     * @param bool $last
     * @return string
     */
    protected function _selector_an_plus_b($expr, $last = false)
    {
        $expr = preg_replace("/\s/", "", $expr);
        if (!preg_match("/^(?P<a>-?[0-9]*)?n(?P<b>[-+]?[0-9]+)?$/", $expr, $matches)) {
            return "false()";
        }

$a = ((isset($matches["a"]) && $matches["a"] !== "") ? intval($matches["a"]) : 1);
        $b = ((isset($matches["b"]) && $matches["b"] !== "") ? intval($matches["b"]) : 0);

$position = ($last ? "(last()-position()+1)" : "position()");

if ($b == 0) {
            return "($position mod $a) = 0";
        } else {
            $compare = (($a < 0) ? "<=" : ">=");
            $b2 = -$b;
            if ($b2 >= 0) {
                $b2 = "+$b2";
            }
            return "($position $compare $b) and ((($position $b2) mod " . abs($a) . ") = 0)";
        }
    }

/**
     * applies all current styles to a particular document tree
     *
     * apply_styles() applies all currently loaded styles to the provided
     * {@link FrameTree}.  Aside from parsing CSS, this is the main purpose
     * of this class.
     *
     * @param \Dompdf\Frame\FrameTree $tree
     */
    function apply_styles(FrameTree $tree)
    {
        // Use XPath to select nodes.  This would be easier if we could attach
        // Frame objects directly to DOMNodes using the setUserData() method, but
        // we can't do that just yet.  Instead, we set a _node attribute_ in
        // Frame->set_id() and use that as a handle on the Frame object via
        // FrameTree::$_registry.

// We create a scratch array of styles indexed by frame id.  Once all
        // styles have been assigned, we order the cached styles by specificity
        // and create a final style object to assign to the frame.

// FIXME: this is not particularly robust...

$styles = array();
        $xp = new DOMXPath($tree->get_dom());
        $DEBUGCSS = $this->_dompdf->getOptions()->getDebugCss();

// Add generated content
        foreach ($this->_styles as $selector => $selector_styles) {
            /** @var Style $style */
            foreach ($selector_styles as $style) {
                if (strpos($selector, ":before") === false && strpos($selector, ":after") === false) {
                    continue;
                }

$query = $this->_css_selector_to_xpath($selector, true);

// Retrieve the nodes, limit to body for generated content
                //TODO: If we use a context node can we remove the leading dot?
                $nodes = @$xp->query('.' . $query["query"]);
                if ($nodes == null) {
                    Helpers::record_warnings(E_USER_WARNING, "The CSS selector '$selector' is not valid", __FILE__, __LINE__);
                    continue;
                }

/** @var \DOMElement $node */
                foreach ($nodes as $node) {
                    // Only DOMElements get styles
                    if ($node->nodeType != XML_ELEMENT_NODE) {
                        continue;
                    }

foreach (array_keys($query["pseudo_elements"], true, true) as $pos) {
                        // Do not add a new pseudo element if another one already matched
                        if ($node->hasAttribute("dompdf_{$pos}_frame_id")) {
                            continue;
                        }

if (($src = $this->_image($style->get_prop('content'))) !== "none") {
                            $new_node = $node->ownerDocument->createElement("img_generated");
                            $new_node->setAttribute("src", $src);
                        } else {
                            $new_node = $node->ownerDocument->createElement("dompdf_generated");
                        }

$new_node->setAttribute($pos, $pos);
                        $new_frame_id = $tree->insert_node($node, $new_node, $pos);
                        $node->setAttribute("dompdf_{$pos}_frame_id", $new_frame_id);
                    }
                }
            }
        }

// Apply all styles in stylesheet
        foreach ($this->_styles as $selector => $selector_styles) {
            /** @var Style $style */
            foreach ($selector_styles as $style) {
                $query = $this->_css_selector_to_xpath($selector);

// Retrieve the nodes
                $nodes = @$xp->query($query["query"]);
                if ($nodes == null) {
                    Helpers::record_warnings(E_USER_WARNING, "The CSS selector '$selector' is not valid", __FILE__, __LINE__);
                    continue;
                }

$spec = $this->_specificity($selector, $style->get_origin());

foreach ($nodes as $node) {
                    // Retrieve the node id
                    // Only DOMElements get styles
                    if ($node->nodeType != XML_ELEMENT_NODE) {
                        continue;
                    }

$id = $node->getAttribute("frame_id");

// Assign the current style to the scratch array
                    $styles[$id][$spec][] = $style;
                }
            }
        }

// Set the page width, height, and orientation based on the canvas paper size
        $canvas = $this->_dompdf->getCanvas();
        $paper_width = $canvas->get_width();
        $paper_height = $canvas->get_height();
        $paper_orientation = ($paper_width > $paper_height ? "landscape" : "portrait");

if ($this->_page_styles["base"] && is_array($this->_page_styles["base"]->size)) {
            $paper_width = $this->_page_styles['base']->size[0];
            $paper_height = $this->_page_styles['base']->size[1];
            $paper_orientation = ($paper_width > $paper_height ? "landscape" : "portrait");
        }

// Now create the styles and assign them to the appropriate frames. (We
        // iterate over the tree using an implicit FrameTree iterator.)
        $root_flg = false;
        foreach ($tree->get_frames() as $frame) {
            // Helpers::pre_r($frame->get_node()->nodeName . ":");
            if (!$root_flg && $this->_page_styles["base"]) {
                $style = $this->_page_styles["base"];
            } else {
                $style = $this->create_style();
            }

// Find nearest DOMElement parent
            $p = $frame;
            while ($p = $p->get_parent()) {
                if ($p->get_node()->nodeType == XML_ELEMENT_NODE) {
                    break;
                }
            }

// Styles can only be applied directly to DOMElements; anonymous
            // frames inherit from their parent
            if ($frame->get_node()->nodeType != XML_ELEMENT_NODE) {
                if ($p) {
                    $style->inherit($p->get_style());
                }

$frame->set_style($style);
                continue;
            }

$id = $frame->get_id();

// Handle HTML 4.0 attributes
            AttributeTranslator::translate_attributes($frame);
            if (($str = $frame->get_node()->getAttribute(AttributeTranslator::$_style_attr)) !== "") {
                $styles[$id][self::SPEC_NON_CSS][] = $this->_parse_properties($str);
            }

// Locate any additional style attributes
            if (($str = $frame->get_node()->getAttribute("style")) !== "") {
                // Destroy CSS comments
                $str = preg_replace("'/\*.*?\*/'si", "", $str);

$spec = $this->_specificity("!attr", self::ORIG_AUTHOR);
                $styles[$id][$spec][] = $this->_parse_properties($str);
            }

// Grab the applicable styles
            if (isset($styles[$id])) {

/** @var array[][] $applied_styles */
                $applied_styles = $styles[$id];

// Sort by specificity
                ksort($applied_styles);

if ($DEBUGCSS) {
                    $debug_nodename = $frame->get_node()->nodeName;
                    print "<pre>\n[$debug_nodename\n";
                    foreach ($applied_styles as $spec => $arr) {
                        printf("specificity: 0x%08x\n", $spec);
                        /** @var Style $s */
                        foreach ($arr as $s) {
                            print "[\n";
                            $s->debug_print();
                            print "]\n";
                        }
                    }
                }

// Merge the new styles with the inherited styles
                $acceptedmedia = self::$ACCEPTED_GENERIC_MEDIA_TYPES;
                $acceptedmedia[] = $this->_dompdf->getOptions()->getDefaultMediaType();
                foreach ($applied_styles as $arr) {
                    /** @var Style $s */
                    foreach ($arr as $s) {
                        $media_queries = $s->get_media_queries();
                        foreach ($media_queries as $media_query) {
                            list($media_query_feature, $media_query_value) = $media_query;
                            // if any of the Style's media queries fail then do not apply the style
                            //TODO: When the media query logic is fully developed we should not apply the Style when any of the media queries fail or are bad, per https://www.w3.org/TR/css3-mediaqueries/#error-handling
                            if (in_array($media_query_feature, self::$VALID_MEDIA_TYPES)) {
                                if ((strlen($media_query_feature) === 0 && !in_array($media_query, $acceptedmedia)) || (in_array($media_query, $acceptedmedia) && $media_query_value == "not")) {
                                    continue (3);
                                }
                            } else {
                                switch ($media_query_feature) {
                                    case "height":
                                        if ($paper_height !== (float)$style->length_in_pt($media_query_value)) {
                                            continue (3);
                                        }
                                        break;
                                    case "min-height":
                                        if ($paper_height < (float)$style->length_in_pt($media_query_value)) {
                                            continue (3);
                                        }
                                        break;
                                    case "max-height":
                                        if ($paper_height > (float)$style->length_in_pt($media_query_value)) {
                                            continue (3);
                                        }
                                        break;
                                    case "width":
                                        if ($paper_width !== (float)$style->length_in_pt($media_query_value)) {
                                            continue (3);
                                        }
                                        break;
                                    case "min-width":
                                        //if (min($paper_width, $media_query_width) === $paper_width) {
                                        if ($paper_width < (float)$style->length_in_pt($media_query_value)) {
                                            continue (3);
                                        }
                                        break;
                                    case "max-width":
                                        //if (max($paper_width, $media_query_width) === $paper_width) {
                                        if ($paper_width > (float)$style->length_in_pt($media_query_value)) {
                                            continue (3);
                                        }
                                        break;
                                    case "orientation":
                                        if ($paper_orientation !== $media_query_value) {
                                            continue (3);
                                        }
                                        break;
                                    default:
                                        Helpers::record_warnings(E_USER_WARNING, "Unknown media query: $media_query_feature", __FILE__, __LINE__);
                                        break;
                                }
                            }
                        }

$style->merge($s);
                    }
                }
            }

// Inherit parent's styles if parent exists
            if ($p) {
                if ($DEBUGCSS) {
                    print "inherit:\n";
                    print "[\n";
                    $p->get_style()->debug_print();
                    print "]\n";
                }
                $style->inherit($p->get_style());
            }

if ($DEBUGCSS) {
                print "DomElementStyle:\n";
                print "[\n";
                $style->debug_print();
                print "]\n";
                print "/$debug_nodename]\n</pre>";
            }

/*DEBUGCSS print: see below different print debugging method
            Helpers::pre_r($frame->get_node()->nodeName . ":");
            echo "<pre>";
            echo $style;
            echo "</pre>";*/
            $frame->set_style($style);

if (!$root_flg && $this->_page_styles["base"]) {
                $root_flg = true;

// set the page width, height, and orientation based on the parsed page style
                if ($style->size !== "auto") {
                    list($paper_width, $paper_height) = $style->size;
                }
                $paper_width = $paper_width - (float)$style->length_in_pt($style->margin_left) - (float)$style->length_in_pt($style->margin_right);
                $paper_height = $paper_height - (float)$style->length_in_pt($style->margin_top) - (float)$style->length_in_pt($style->margin_bottom);
                $paper_orientation = ($paper_width > $paper_height ? "landscape" : "portrait");
            }
        }

// 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) {
            $this->_styles[$key] = null;
            unset($this->_styles[$key]);
        }
    }

/**
     * parse a CSS string using a regex parser
     * Called by {@link Stylesheet::parse_css()}
     *
     * @param string $str
     *
     * @throws Exception
     */
    private function _parse_css($str)
    {
        $str = trim($str);

// Destroy comments and remove HTML comments
        $css = preg_replace(array(
            "'/\*.*?\*/'si",
            "/^$/"
        ), "", $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 preceded by '@') \n" .
            "([^{]*{[^}]*}))                        # Parse normal rulesets                               \n" .
            "/xs";

if (preg_match_all($re, $css, $matches, PREG_SET_ORDER) === false) {
            // An error occurred
            throw new Exception("Error parsing css file: preg_match_all() failed.");
        }

// After matching, the array indices 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
        //

$media_query_regex = "/(?:((only|not)?\s*(" . implode("|", self::$VALID_MEDIA_TYPES) . "))|(\s*$\s*((?:(min|max)-)?([\w\-]+))\s*(?:\:\s*(.*?)\s*)?$))/isx";

//Helpers::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":
                        $acceptedmedia = self::$ACCEPTED_GENERIC_MEDIA_TYPES;
                        $acceptedmedia[] = $this->_dompdf->getOptions()->getDefaultMediaType();

$media_queries = preg_split("/\s*,\s*/", mb_strtolower(trim($match[3])));
                        foreach ($media_queries as $media_query) {
                            if (in_array($media_query, $acceptedmedia)) {
                                //if we have a media type match go ahead and parse the stylesheet
                                $this->_parse_sections($match[5]);
                                break;
                            } elseif (!in_array($media_query, self::$VALID_MEDIA_TYPES)) {
                                // otherwise conditionally parse the stylesheet assuming there are parseable media queries
                                if (preg_match_all($media_query_regex, $media_query, $media_query_matches, PREG_SET_ORDER) !== false) {
                                    $mq = array();
                                    foreach ($media_query_matches as $media_query_match) {
                                        if (empty($media_query_match[1]) === false) {
                                            $media_query_feature = strtolower($media_query_match[3]);
                                            $media_query_value = strtolower($media_query_match[2]);
                                            $mq[] = array($media_query_feature, $media_query_value);
                                        } else if (empty($media_query_match[4]) === false) {
                                            $media_query_feature = strtolower($media_query_match[5]);
                                            $media_query_value = (array_key_exists(8, $media_query_match) ? strtolower($media_query_match[8]) : null);
                                            $mq[] = array($media_query_feature, $media_query_value);
                                        }
                                    }
                                    $this->_parse_sections($match[5], $mq);
                                    break;
                                }
                            }
                        }
                        break;

case "page":
                        //This handles @page to be applied to page oriented media
                        //Note: This has a reduced syntax:
                        //@page { margin:1cm; color:blue; }
                        //Not a sequence of styles like a full.css, but only the properties
                        //of a single style, which is applied to the very first "root" frame before
                        //processing other styles of the frame.
                        //Working properties:
                        // margin (for margin around edge of paper)
                        // font-family (default font of pages)
                        // color (default text color of pages)
                        //Non working properties:
                        // border
                        // padding
                        // background-color
                        //Todo:Reason is unknown
                        //Other properties (like further font or border attributes) not tested.
                        //If a border or background color around each paper sheet is desired,
                        //assign it to the <body> tag, possibly only for the css of the correct media type.

// If the page has a name, skip the style.
                        $page_selector = trim($match[3]);

$key = null;
                        switch ($page_selector) {
                            case "":
                                $key = "base";
                                break;

case ":left":
                            case ":right":
                            case ":odd":
                            case ":even":
                            /** @noinspection PhpMissingBreakStatementInspection */
                            case ":first":
                                $key = $page_selector;
                                break;

default:
                                break 2;
                        }

// Store the style for later...
                        if (empty($this->_page_styles[$key])) {
                            $this->_page_styles[$key] = $this->_parse_properties($match[5]);
                        } else {
                            $this->_page_styles[$key]->merge($this->_parse_properties($match[5]));
                        }
                        break;

case "font-face":
                        $this->_parse_font_face($match[5]);
                        break;

default:
                        // ignore everything else
                        break;
                }

continue;
            }

if ($match[7] !== "") {
                $this->_parse_sections($match[7]);
            }
        }
    }

/**
     * See also style.cls Style::_image(), refactoring?, works also for imported css files
     *
     * @param $val
     * @return string
     */
    protected function _image($val)
    {
        $DEBUGCSS = $this->_dompdf->getOptions()->getDebugCss();
        $parsed_url = "none";

if (mb_strpos($val, "url") === false) {
            $path = "none"; //Don't resolve no image -> otherwise would prefix path and no longer recognize as none
        } else {
            $val = preg_replace("/url$\s*['\"]?([^'\")]+)['\"]?\s*$/", "\\1", trim($val));

// Resolve the url now in the context of the current stylesheet
            $parsed_url = Helpers::explode_url($val);
            if ($parsed_url["protocol"] == "" && $this->get_protocol() == "") {
                if ($parsed_url["path"][0] === '/' || $parsed_url["path"][0] === '\\') {
                    $path = $_SERVER["DOCUMENT_ROOT"] . '/';
                } else {
                    $path = $this->get_base_path();
                }

$path .= $parsed_url["path"] . $parsed_url["file"];
                $path = realpath($path);
                // If realpath returns FALSE then specifically state that there is no background image
                // FIXME: Is this causing problems for imported CSS files? There are some './none' references when running the test cases.
                if (!$path) {
                    $path = 'none';
                }
            } else {
                $path = Helpers::build_url($this->get_protocol(),
                    $this->get_host(),
                    $this->get_base_path(),
                    $val);
            }
        }

if ($DEBUGCSS) {
            print "<pre>[_image\n";
            print_r($parsed_url);
            print $this->get_protocol() . "\n" . $this->get_base_path() . "\n" . $path . "\n";
            print "_image]</pre>";;
        }

return $path;
    }

/**
     * parse @import{} sections
     *
     * @param string $url the url of the imported CSS file
     */
    private function _parse_import($url)
    {
        $arr = preg_split("/[\s\n,]/", $url, -1, PREG_SPLIT_NO_EMPTY);
        $url = array_shift($arr);
        $accept = false;

if (count($arr) > 0) {
            $acceptedmedia = self::$ACCEPTED_GENERIC_MEDIA_TYPES;
            $acceptedmedia[] = $this->_dompdf->getOptions()->getDefaultMediaType();

// @import url media_type [media_type...]
            foreach ($arr as $type) {
                if (in_array(mb_strtolower(trim($type)), $acceptedmedia)) {
                    $accept = true;
                    break;
                }
            }

} else {
            // unconditional import
            $accept = true;
        }

if ($accept) {
            // Store our current base url properties in case the new url is elsewhere
            $protocol = $this->_protocol;
            $host = $this->_base_host;
            $path = $this->_base_path;

// $url = str_replace(array('"',"url", "(", ")"), "", $url);
            // If the protocol is php, assume that we will import using file://
            // $url = Helpers::build_url($protocol == "php://" ? "file://" : $protocol, $host, $path, $url);
            // Above does not work for subfolders and absolute urls.
            // Todo: As above, do we need to replace php or file to an empty protocol for local files?

$url = $this->_image($url);

$this->load_css_file($url);

// Restore the current base url
            $this->_protocol = $protocol;
            $this->_base_host = $host;
            $this->_base_path = $path;
        }
    }

/**
     * parse @font-face{} sections
     * http://www.w3.org/TR/css3-fonts/#the-font-face-rule
     *
     * @param string $str CSS @font-face rules
     */
    private function _parse_font_face($str)
    {
        $descriptors = $this->_parse_properties($str);

preg_match_all("/(url|local)\s*$[\"\']?([^\"\'$]+)[\"\']?\)\s*(format\s*$[\"\']?([^\"\'$]+)[\"\']?\))?/i", $descriptors->src, $src);

$sources = array();
        $valid_sources = array();

foreach ($src[0] as $i => $value) {
            $source = array(
                "local" => strtolower($src[1][$i]) === "local",
                "uri" => $src[2][$i],
                "format" => strtolower($src[4][$i]),
                "path" => Helpers::build_url($this->_protocol, $this->_base_host, $this->_base_path, $src[2][$i]),
            );

if (!$source["local"] && in_array($source["format"], array("", "truetype"))) {
                $valid_sources[] = $source;
            }

$sources[] = $source;
        }

// No valid sources
        if (empty($valid_sources)) {
            return;
        }

$style = array(
            "family" => $descriptors->get_font_family_raw(),
            "weight" => $descriptors->font_weight,
            "style" => $descriptors->font_style,
        );

$this->getFontMetrics()->registerFont($style, $valid_sources[0]["path"], $this->_dompdf->getHttpContext());
    }

/**
     * 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)
    {
        $properties = preg_split("/;(?=(?:[^$]*\([^$]*\))*(?![^\)]*\)))/", $str);
        $DEBUGCSS = $this->_dompdf->getOptions()->getDebugCss();

if ($DEBUGCSS) {
            print '[_parse_properties';
        }

// Create the style
        $style = new Style($this, Stylesheet::ORIG_AUTHOR);

foreach ($properties as $prop) {
            // If the $prop contains an url, the regex may be wrong
            // @todo: fix the regex so that it works every time
            /*if (strpos($prop, "url(") === false) {
              if (preg_match("/([a-z-]+)\s*:\s*[^:]+$/i", $prop, $m))
                $prop = $m[0];
            }*/
            //A css property can have " ! important" appended (whitespace optional)
            //strip this off to decode core of the property correctly.
            //Pass on in the style to allow proper handling:
            //!important properties can only be overridden by other !important ones.
            //$style->$prop_name = is a shortcut of $style->__set($prop_name,$value);.
            //If no specific set function available, set _props["prop_name"]
            //style is always copied completely, or $_props handled separately
            //Therefore set a _important_props["prop_name"]=true to indicate the modifier

/* Instead of short code, prefer the typical case with fast code
          $important = preg_match("/(.*?)!\s*important/",$prop,$match);
            if ( $important ) {
              $prop = $match[1];
            }
            $prop = trim($prop);
            */
            if ($DEBUGCSS) print '(';

$important = false;
            $prop = trim($prop);

if (substr($prop, -9) === 'important') {
                $prop_tmp = rtrim(substr($prop, 0, -9));

if (substr($prop_tmp, -1) === '!') {
                    $prop = rtrim(substr($prop_tmp, 0, -1));
                    $important = true;
                }
            }

if ($prop === "") {
                if ($DEBUGCSS) print 'empty)';
                continue;
            }

$i = mb_strpos($prop, ":");
            if ($i === false) {
                if ($DEBUGCSS) print 'novalue' . $prop . ')';
                continue;
            }

$prop_name = rtrim(mb_strtolower(mb_substr($prop, 0, $i)));
            $value = ltrim(mb_substr($prop, $i + 1));
            if ($DEBUGCSS) print $prop_name . ':=' . $value . ($important ? '!IMPORTANT' : '') . ')';
            //New style, anyway empty
            //if ($important || !$style->important_get($prop_name) ) {
            //$style->$prop_name = array($value,$important);
            //assignment might be replaced by overloading through __set,
            //and overloaded functions might check _important_props,
            //therefore set _important_props first.
            if ($important) {
                $style->important_set($prop_name);
            }
            //For easier debugging, don't use overloading of assignments with __set
            $style->$prop_name = $value;
            //$style->props_set($prop_name, $value);
        }
        if ($DEBUGCSS) print '_parse_properties]';

return $style;
    }

/**
     * parse selector + rulesets
     *
     * @param string $str CSS selectors and rulesets
     * @param array $media_queries
     */
    private function _parse_sections($str, $media_queries = array())
    {
        // Pre-process: collapse all whitespace and strip whitespace around '>',
        // '.', ':', '+', '#'

$patterns = array("/[\\s\n]+/", "/\\s+([>.:+#])\\s+/");
        $replacements = array(" ", "\\1");
        $str = preg_replace($patterns, $replacements, $str);
        $DEBUGCSS = $this->_dompdf->getOptions()->getDebugCss();

$sections = explode("}", $str);
        if ($DEBUGCSS) print '[_parse_sections';
        foreach ($sections as $sect) {
            $i = mb_strpos($sect, "{");
            if ($i === false) { continue; }

//$selectors = explode(",", mb_substr($sect, 0, $i));
            $selectors = preg_split("/,(?![^$]*$)/", mb_substr($sect, 0, $i), 0, PREG_SPLIT_NO_EMPTY);
            if ($DEBUGCSS) print '[section';

$style = $this->_parse_properties(trim(mb_substr($sect, $i + 1)));

// Assign it to the selected elements
            foreach ($selectors as $selector) {
                $selector = trim($selector);

if ($selector == "") {
                    if ($DEBUGCSS) print '#empty#';
                    continue;
                }
                if ($DEBUGCSS) print '#' . $selector . '#';
                //if ($DEBUGCSS) { if (strpos($selector,'p') !== false) print '!!!p!!!#'; }

//FIXME: tag the selector with a hash of the media query to separate it from non-conditional styles (?), xpath comments are probably not what we want to do here
                if (count($media_queries) > 0) {
                    $style->set_media_queries($media_queries);
                }
                $this->add_style($selector, $style);
            }

if ($DEBUGCSS) {
                print 'section]';
            }
        }

if ($DEBUGCSS) {
            print '_parse_sections]';
        }
    }

/**
     * @return string
     */
    public static function getDefaultStylesheet()
    {
        $dir = realpath(__DIR__ . "/../..");
        return $dir . self::DEFAULT_STYLESHEET;
    }

/**
     * @param FontMetrics $fontMetrics
     * @return $this
     */
    public function setFontMetrics(FontMetrics $fontMetrics)
    {
        $this->fontMetrics = $fontMetrics;
        return $this;
    }

/**
     * @return FontMetrics
     */
    public function getFontMetrics()
    {
        return $this->fontMetrics;
    }

/**
     * 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 => $selector_styles) {
            /** @var Style $style */
            foreach ($selector_styles as $style) {
                $str .= "$selector => " . $style->__toString() . "\n";
            }
        }

return $str;
    }
}

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