PHP Frame::find_block_parent方法代码示例

//.........这里部分代码省略.........
             dompdf_debug("page-break", "after: avoid");
             return false;
         }
         // If both $prev & $frame have the same parent, check the parent's
         // page_break_inside property.
         $parent = $frame->get_parent();
         if ($prev && $parent && $parent->get_style()->page_break_inside === "avoid") {
             dompdf_debug("page-break", "parent inside: avoid");
             return false;
         }
         // To prevent cascading page breaks when a top-level element has
         // page-break-inside: avoid, ensure that at least one frame is
         // on the page before splitting.
         if ($parent->get_node()->nodeName === "body" && !$prev) {
             // We are the body's first child
             dompdf_debug("page-break", "Body's first child.");
             return false;
         }
         // If the frame is the first block-level frame, use the value from
         // $frame's parent instead.
         if (!$prev && $parent) {
             return $this->_page_break_allowed($parent);
         }
         dompdf_debug("page-break", "block: break allowed");
         return true;
     } else {
         if (in_array($display, Style::$INLINE_TYPES)) {
             // Avoid breaks within table-cells
             if ($this->_in_table) {
                 dompdf_debug("page-break", "In table: " . $this->_in_table);
                 return false;
             }
             // Rule C
             $block_parent = $frame->find_block_parent();
             if (count($block_parent->get_line_boxes()) < $frame->get_style()->orphans) {
                 dompdf_debug("page-break", "orphans");
                 return false;
             }
             // FIXME: Checking widows is tricky without having laid out the
             // remaining line boxes.  Just ignore it for now...
             // Rule D
             $p = $block_parent;
             while ($p) {
                 if ($p->get_style()->page_break_inside === "avoid") {
                     dompdf_debug("page-break", "parent->inside: avoid");
                     return false;
                 }
                 $p = $p->find_block_parent();
             }
             // To prevent cascading page breaks when a top-level element has
             // page-break-inside: avoid, ensure that at least one frame with
             // some content is on the page before splitting.
             $prev = $frame->get_prev_sibling();
             while ($prev && ($prev->is_text_node() && trim($prev->get_node()->nodeValue) == "")) {
                 $prev = $prev->get_prev_sibling();
             }
             if ($block_parent->get_node()->nodeName === "body" && !$prev) {
                 // We are the body's first child
                 dompdf_debug("page-break", "Body's first child.");
                 return false;
             }
             // Skip breaks on empty text nodes
             if ($frame->is_text_node() && $frame->get_node()->nodeValue == "") {
                 return false;
             }
             dompdf_debug("page-break", "inline: break allowed");

//.........这里部分代码省略.........
         // Does the previous element allow a page break after?
         if ($prev && $prev->get_style()->page_break_after == "avoid") {
             //        echo "after: avoid\n";
             return false;
         }
         // If both $prev & $frame have the same parent, check the parent's
         // page_break_inside property.
         $parent = $frame->get_parent();
         if ($prev && $parent && $parent->get_style()->page_break_inside == "avoid") {
             //          echo "parent inside: avoid\n";
             return false;
         }
         // To prevent cascading page breaks when a top-level element has
         // page-break-inside: avoid, ensure that at least one frame is
         // on the page before splitting.
         if ($parent->get_node()->nodeName == "body" && !$prev) {
             // We are the body's first child
             //          echo "Body's first child.\n";
             return false;
         }
         // If the frame is the first block-level frame, use the value from
         // $frame's parent instead.
         if (!$prev && $parent) {
             return $this->_page_break_allowed($parent);
         }
         //       echo "block: break allowed\n";
         return true;
     } else {
         if (in_array($display, Style::$INLINE_TYPES)) {
             // Avoid breaks within table-cells
             if ($this->_in_table) {
                 //          echo "In table: " . $this->_in_table ."\n";
                 return false;
             }
             // Rule C
             $block_parent = $frame->find_block_parent();
             if (count($block_parent->get_lines()) < $frame->get_style()->orphans) {
                 //          echo "orphans\n";
                 return false;
             }
             // FIXME: Checking widows is tricky without having laid out the
             // remaining line boxes.  Just ignore it for now...
             // Rule D
             if ($block_parent->get_style()->page_break_inside == "avoid") {
                 //          echo "parent->inside: avoid\n";
                 return false;
             }
             // To prevent cascading page breaks when a top-level element has
             // page-break-inside: avoid, ensure that at least one frame with
             // some content is on the page before splitting.
             $prev = $frame->get_prev_sibling();
             while ($prev && ($prev->get_node()->nodeName == "#text" && trim($prev->get_node()->nodeValue) == "")) {
                 $prev = $prev->get_prev_sibling();
             }
             if ($block_parent->get_node()->nodeName == "body" && !$prev) {
                 // We are the body's first child
                 //          echo "Body's first child.\n";
                 return false;
             }
             // Skip breaks on empty text nodes
             if ($frame->get_node()->nodeName == "#text" && $frame->get_node()->nodeValue == "") {
                 return false;
             }
             //       echo "inline: break allowed\n";
             return true;
             // Table-rows
         } else {
             if ($display == "table-row") {
                 // Simply check if the parent table's page_break_inside property is
                 // not 'avoid'
                 $p = Table_Frame_Decorator::find_parent_table($frame);
                 if ($p->get_style()->page_break_inside == "avoid") {
                     //          echo "table: page-break-inside: avoid\n";
                     return false;
                 }
                 // Check the table's parent element
                 $table_parent = $p->get_parent();
                 if ($table_parent->get_style()->page_break_inside == "avoid") {
                     //          echo "table->parent: page-break-inside: avoid\n";
                     return false;
                 }
                 // Avoid breaking after the first row of a table
                 if ($p->get_first_child() === $frame) {
                     //         echo "table: first-row\n";
                     return false;
                 }
                 //       echo "table-row/row-groups: break allowed\n";
                 return true;
             } else {
                 if (in_array($display, Table_Frame_Decorator::$ROW_GROUPS)) {
                     // Disallow breaks at row-groups: only split at row boundaries
                     return false;
                 } else {
                     //       echo "? " . $frame->get_style()->display . "\n";
                     return false;
                 }
             }
         }
     }
 }

 /**
  * Parses the CSS "content" property
  * 
  * @return string 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;
     }
     $text = "";
     foreach ($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;
             }
             $args = explode(",", mb_substr($match[1], 8, $i - 8));
             $counter_id = $args[0];
             if ($match[1][7] === "(") {
                 // counter(name [,style])
                 if (isset($args[1])) {
                     $type = trim($args[1]);
                 } else {
                     $type = null;
                 }
                 $p = $this->_frame->find_block_parent();
                 $text .= $p->counter_value($counter_id, $type);
             } else {
                 if ($match[1][7] === "s") {
                     // counters(name, string [,style])
                     if (isset($args[1])) {
                         $string = $this->_parse_string(trim($args[1]));
                     } else {
                         $string = "";
                     }
                     if (isset($args[2])) {
                         $type = $args[2];
                     } else {
                         $type = null;
                     }
                     $p = $this->_frame->find_block_parent();
                     $tmp = "";
                     while ($p) {
                         $tmp = $p->counter_value($counter_id, $type) . $string . $tmp;
                         $p = $p->find_block_parent();
                     }
                     $text .= $tmp;
                 } else {
                     // countertops?
                     continue;
                 }
             }
         } else {
             if (isset($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;
//.........这里部分代码省略.........

 protected function _page_break_allowed(Frame $frame)
 {
     $block_types = array("block", "list-item", "table", "-dompdf-image");
     dompdf_debug("page-break", "_page_break_allowed(" . $frame->get_node()->nodeName . ")");
     $display = $frame->get_style()->display;
     if (in_array($display, $block_types)) {
         if ($this->_in_table) {
             dompdf_debug("page-break", "In table: " . $this->_in_table);
             return false;
         }
         if ($frame->get_style()->page_break_before === "avoid") {
             dompdf_debug("page-break", "before: avoid");
             return false;
         }
         $prev = $frame->get_prev_sibling();
         while ($prev && !in_array($prev->get_style()->display, $block_types)) {
             $prev = $prev->get_prev_sibling();
         }
         if ($prev && $prev->get_style()->page_break_after === "avoid") {
             dompdf_debug("page-break", "after: avoid");
             return false;
         }
         $parent = $frame->get_parent();
         if ($prev && $parent && $parent->get_style()->page_break_inside === "avoid") {
             dompdf_debug("page-break", "parent inside: avoid");
             return false;
         }
         if ($parent->get_node()->nodeName === "body" && !$prev) {
             dompdf_debug("page-break", "Body's first child.");
             return false;
         }
         if (!$prev && $parent) {
             return $this->_page_break_allowed($parent);
         }
         dompdf_debug("page-break", "block: break allowed");
         return true;
     } else {
         if (in_array($display, Style::$INLINE_TYPES)) {
             if ($this->_in_table) {
                 dompdf_debug("page-break", "In table: " . $this->_in_table);
                 return false;
             }
             $block_parent = $frame->find_block_parent();
             if (count($block_parent->get_line_boxes()) < $frame->get_style()->orphans) {
                 dompdf_debug("page-break", "orphans");
                 return false;
             }
             $p = $block_parent;
             while ($p) {
                 if ($p->get_style()->page_break_inside === "avoid") {
                     dompdf_debug("page-break", "parent->inside: avoid");
                     return false;
                 }
                 $p = $p->find_block_parent();
             }
             $prev = $frame->get_prev_sibling();
             while ($prev && ($prev->is_text_node() && trim($prev->get_node()->nodeValue) == "")) {
                 $prev = $prev->get_prev_sibling();
             }
             if ($block_parent->get_node()->nodeName === "body" && !$prev) {
                 dompdf_debug("page-break", "Body's first child.");
                 return false;
             }
             if ($frame->is_text_node() && $frame->get_node()->nodeValue == "") {
                 return false;
             }
             dompdf_debug("page-break", "inline: break allowed");
             return true;
         } else {
             if ($display === "table-row") {
                 $p = Table_Frame_Decorator::find_parent_table($frame);
                 while ($p) {
                     if ($p->get_style()->page_break_inside === "avoid") {
                         dompdf_debug("page-break", "parent->inside: avoid");
                         return false;
                     }
                     $p = $p->find_block_parent();
                 }
                 if ($p && $p->get_first_child() === $frame) {
                     dompdf_debug("page-break", "table: first-row");
                     return false;
                 }
                 if ($this->_in_table > 1) {
                     dompdf_debug("page-break", "table: nested table");
                     return false;
                 }
                 dompdf_debug("page-break", "table-row/row-groups: break allowed");
                 return true;
             } else {
                 if (in_array($display, Table_Frame_Decorator::$ROW_GROUPS)) {
                     return false;
                 } else {
                     dompdf_debug("page-break", "? " . $frame->get_style()->display . "");
                     return false;
                 }
             }
         }
     }
 }