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Direktori : /home2/selectio/public_html/tnpsctestbatch.com/src/FrameReflower/ |
Current File : /home2/selectio/public_html/tnpsctestbatch.com/src/FrameReflower/AbstractFrameReflower.php |
<?php /** * @package dompdf * @link http://dompdf.github.com/ * @author Benj Carson <benjcarson@digitaljunkies.ca> * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License */ namespace Dompdf\FrameReflower; use Dompdf\Adapter\CPDF; use Dompdf\Css\Style; use Dompdf\Dompdf; use Dompdf\Helpers; use Dompdf\Frame; use Dompdf\FrameDecorator\Block; use Dompdf\Frame\Factory; /** * Base reflower class * * Reflower objects are responsible for determining the width and height of * individual frames. They also create line and page breaks as necessary. * * @package dompdf */ abstract class AbstractFrameReflower { /** * Frame for this reflower * * @var Frame */ protected $_frame; /** * Cached min/max size * * @var array */ protected $_min_max_cache; /** * AbstractFrameReflower constructor. * @param Frame $frame */ function __construct(Frame $frame) { $this->_frame = $frame; $this->_min_max_cache = null; } function dispose() { } /** * @return Dompdf */ function get_dompdf() { return $this->_frame->get_dompdf(); } /** * Collapse frames margins * http://www.w3.org/TR/CSS2/box.html#collapsing-margins */ protected function _collapse_margins() { $frame = $this->_frame; $cb = $frame->get_containing_block(); $style = $frame->get_style(); // Margins of float/absolutely positioned/inline-block elements do not collapse. if (!$frame->is_in_flow() || $frame->is_inline_block() || $frame->get_root() == $frame || $frame->get_parent() == $frame->get_root()) { return; } $t = $style->length_in_pt($style->margin_top, $cb["h"]); $b = $style->length_in_pt($style->margin_bottom, $cb["h"]); // Handle 'auto' values if ($t === "auto") { $style->margin_top = "0pt"; $t = 0; } if ($b === "auto") { $style->margin_bottom = "0pt"; $b = 0; } // Collapse vertical margins: $n = $frame->get_next_sibling(); if ( $n && !$n->is_block() & !$n->is_table() ) { while ($n = $n->get_next_sibling()) { if ($n->is_block() || $n->is_table()) { break; } if (!$n->get_first_child()) { $n = null; break; } } } if ($n) { $n_style = $n->get_style(); $n_t = (float)$n_style->length_in_pt($n_style->margin_top, $cb["h"]); $b = $this->_get_collapsed_margin_length($b, $n_t); $style->margin_bottom = $b . "pt"; $n_style->margin_top = "0pt"; } // Collapse our first child's margin, if there is no border or padding if ($style->border_top_width == 0 && $style->length_in_pt($style->padding_top) == 0) { $f = $this->_frame->get_first_child(); if ( $f && !$f->is_block() && !$f->is_table() ) { while ( $f = $f->get_next_sibling() ) { if ( $f->is_block() || $f->is_table() ) { break; } if ( !$f->get_first_child() ) { $f = null; break; } } } // Margin are collapsed only between block-level boxes if ($f) { $f_style = $f->get_style(); $f_t = (float)$f_style->length_in_pt($f_style->margin_top, $cb["h"]); $t = $this->_get_collapsed_margin_length($t, $f_t); $style->margin_top = $t."pt"; $f_style->margin_top = "0pt"; } } // Collapse our last child's margin, if there is no border or padding if ($style->border_bottom_width == 0 && $style->length_in_pt($style->padding_bottom) == 0) { $l = $this->_frame->get_last_child(); if ( $l && !$l->is_block() && !$l->is_table() ) { while ( $l = $l->get_prev_sibling() ) { if ( $l->is_block() || $l->is_table() ) { break; } if ( !$l->get_last_child() ) { $l = null; break; } } } // Margin are collapsed only between block-level boxes if ($l) { $l_style = $l->get_style(); $l_b = (float)$l_style->length_in_pt($l_style->margin_bottom, $cb["h"]); $b = $this->_get_collapsed_margin_length($b, $l_b); $style->margin_bottom = $b."pt"; $l_style->margin_bottom = "0pt"; } } } /** * Get the combined (collapsed) length of two adjoining margins. * * See http://www.w3.org/TR/CSS2/box.html#collapsing-margins. * * @param number $length1 * @param number $length2 * @return number */ private function _get_collapsed_margin_length($length1, $length2) { if ($length1 < 0 && $length2 < 0) { return min($length1, $length2); // min(x, y) = - max(abs(x), abs(y)), if x < 0 && y < 0 } if ($length1 < 0 || $length2 < 0) { return $length1 + $length2; // x + y = x - abs(y), if y < 0 } return max($length1, $length2); } /** * @param Block|null $block * @return mixed */ abstract function reflow(Block $block = null); /** * Required for table layout: Returns an array(0 => min, 1 => max, "min" * => min, "max" => max) of the minimum and maximum widths of this frame. * This provides a basic implementation. Child classes should override * this if necessary. * * @return array|null */ function get_min_max_width() { if (!is_null($this->_min_max_cache)) { return $this->_min_max_cache; } $style = $this->_frame->get_style(); // Account for margins & padding $dims = [$style->padding_left, $style->padding_right, $style->border_left_width, $style->border_right_width, $style->margin_left, $style->margin_right]; $cb_w = $this->_frame->get_containing_block("w"); $delta = (float)$style->length_in_pt($dims, $cb_w); // Handle degenerate case if (!$this->_frame->get_first_child()) { return $this->_min_max_cache = [ $delta, $delta, "min" => $delta, "max" => $delta, ]; } $low = []; $high = []; for ($iter = $this->_frame->get_children()->getIterator(); $iter->valid(); $iter->next()) { $inline_min = 0; $inline_max = 0; // Add all adjacent inline widths together to calculate max width while ($iter->valid() && in_array($iter->current()->get_style()->display, Style::$INLINE_TYPES)) { $child = $iter->current(); $minmax = $child->get_min_max_width(); if (in_array($iter->current()->get_style()->white_space, ["pre", "nowrap"])) { $inline_min += $minmax["min"]; } else { $low[] = $minmax["min"]; } $inline_max += $minmax["max"]; $iter->next(); } if ($inline_max > 0) { $high[] = $inline_max; } if ($inline_min > 0) { $low[] = $inline_min; } if ($iter->valid()) { list($low[], $high[]) = $iter->current()->get_min_max_width(); continue; } } $min = count($low) ? max($low) : 0; $max = count($high) ? max($high) : 0; // Use specified width if it is greater than the minimum defined by the // content. If the width is a percentage ignore it for now. $width = $style->width; if ($width !== "auto" && !Helpers::is_percent($width)) { $width = (float)$style->length_in_pt($width, $cb_w); if ($min < $width) { $min = $width; } if ($max < $width) { $max = $width; } } $min += $delta; $max += $delta; return $this->_min_max_cache = [$min, $max, "min" => $min, "max" => $max]; } /** * Parses a CSS string containing quotes and escaped hex characters * * @param $string string The CSS string to parse * @param $single_trim * @return string */ protected function _parse_string($string, $single_trim = false) { if ($single_trim) { $string = preg_replace('/^[\"\']/', "", $string); $string = preg_replace('/[\"\']$/', "", $string); } else { $string = trim($string, "'\""); } $string = str_replace(["\\\n", '\\"', "\\'"], ["", '"', "'"], $string); // Convert escaped hex characters into ascii characters (e.g. \A => newline) $string = preg_replace_callback("/\\\\([0-9a-fA-F]{0,6})/", function ($matches) { return \Dompdf\Helpers::unichr(hexdec($matches[1])); }, $string); return $string; } /** * Parses a CSS "quotes" property * * @return array|null An array of pairs of quotes */ protected function _parse_quotes() { // Matches quote types $re = '/(\'[^\']*\')|(\"[^\"]*\")/'; $quotes = $this->_frame->get_style()->quotes; // split on spaces, except within quotes if (!preg_match_all($re, "$quotes", $matches, PREG_SET_ORDER)) { return null; } $quotes_array = []; foreach ($matches as $_quote) { $quotes_array[] = $this->_parse_string($_quote[0], true); } if (empty($quotes_array)) { $quotes_array = ['"', '"']; } return array_chunk($quotes_array, 2); } /** * Parses the CSS "content" property * * @return string|null The resulting string */ protected function _parse_content() { // Matches generated content $re = "/\n" . "\s(counters?\\([^)]*\\))|\n" . "\A(counters?\\([^)]*\\))|\n" . "\s([\"']) ( (?:[^\"']|\\\\[\"'])+ )(?<!\\\\)\\3|\n" . "\A([\"']) ( (?:[^\"']|\\\\[\"'])+ )(?<!\\\\)\\5|\n" . "\s([^\s\"']+)|\n" . "\A([^\s\"']+)\n" . "/xi"; $content = $this->_frame->get_style()->content; $quotes = $this->_parse_quotes(); // split on spaces, except within quotes if (!preg_match_all($re, $content, $matches, PREG_SET_ORDER)) { return null; } $text = ""; foreach ($matches as $match) { if (isset($match[2]) && $match[2] !== "") { $match[1] = $match[2]; } if (isset($match[6]) && $match[6] !== "") { $match[4] = $match[6]; } if (isset($match[8]) && $match[8] !== "") { $match[7] = $match[8]; } if (isset($match[1]) && $match[1] !== "") { // counters?(...) $match[1] = mb_strtolower(trim($match[1])); // Handle counter() references: // http://www.w3.org/TR/CSS21/generate.html#content $i = mb_strpos($match[1], ")"); if ($i === false) { continue; } preg_match('/(counters?)(^\()*?\(\s*([^\s,]+)\s*(,\s*["\']?([^"\'\)]*)["\']?\s*(,\s*([^\s)]+)\s*)?)?\)/i', $match[1], $args); $counter_id = $args[3]; if (strtolower($args[1]) == 'counter') { // counter(name [,style]) if (isset($args[5])) { $type = trim($args[5]); } else { $type = null; } $p = $this->_frame->lookup_counter_frame($counter_id); $text .= $p->counter_value($counter_id, $type); } else if (strtolower($args[1]) == 'counters') { // counters(name, string [,style]) if (isset($args[5])) { $string = $this->_parse_string($args[5]); } else { $string = ""; } if (isset($args[7])) { $type = trim($args[7]); } else { $type = null; } $p = $this->_frame->lookup_counter_frame($counter_id); $tmp = []; while ($p) { // We only want to use the counter values when they actually increment the counter if (array_key_exists($counter_id, $p->_counters)) { array_unshift($tmp, $p->counter_value($counter_id, $type)); } $p = $p->lookup_counter_frame($counter_id); } $text .= implode($string, $tmp); } else { // countertops? continue; } } else if (isset($match[4]) && $match[4] !== "") { // String match $text .= $this->_parse_string($match[4]); } else if (isset($match[7]) && $match[7] !== "") { // Directive match if ($match[7] === "open-quote") { // FIXME: do something here $text .= $quotes[0][0]; } else if ($match[7] === "close-quote") { // FIXME: do something else here $text .= $quotes[0][1]; } else if ($match[7] === "no-open-quote") { // FIXME: } else if ($match[7] === "no-close-quote") { // FIXME: } else if (mb_strpos($match[7], "attr(") === 0) { $i = mb_strpos($match[7], ")"); if ($i === false) { continue; } $attr = mb_substr($match[7], 5, $i - 5); if ($attr == "") { continue; } $text .= $this->_frame->get_parent()->get_node()->getAttribute($attr); } else { continue; } } } return $text; } /** * Sets the generated content of a generated frame */ protected function _set_content() { $frame = $this->_frame; $style = $frame->get_style(); // if the element was pushed to a new page use the saved counter value, otherwise use the CSS reset value if ($style->counter_reset && ($reset = $style->counter_reset) !== "none") { $vars = preg_split('/\s+/', trim($reset), 2); $frame->reset_counter($vars[0], (isset($frame->_counters['__' . $vars[0]]) ? $frame->_counters['__' . $vars[0]] : (isset($vars[1]) ? $vars[1] : 0))); } if ($style->counter_increment && ($increment = $style->counter_increment) !== "none") { $frame->increment_counters($increment); } if ($style->content && $frame->get_node()->nodeName === "dompdf_generated") { $content = $this->_parse_content(); // add generated content to the font subset // FIXME: This is currently too late because the font subset has already been generated. // See notes in issue #750. if ($frame->get_dompdf()->getOptions()->getIsFontSubsettingEnabled() && $frame->get_dompdf()->get_canvas() instanceof CPDF) { $frame->get_dompdf()->get_canvas()->register_string_subset($style->font_family, $content); } $node = $frame->get_node()->ownerDocument->createTextNode($content); $new_style = $style->get_stylesheet()->create_style(); $new_style->inherit($style); $new_frame = new Frame($node); $new_frame->set_style($new_style); Factory::decorate_frame($new_frame, $frame->get_dompdf(), $frame->get_root()); $frame->append_child($new_frame); } } /** * Determine current frame width based on contents * * @return float */ public function calculate_auto_width() { return $this->_frame->get_margin_width(); } }