Viewing file:  AbstractFrameReflower.php (15.67 KB) -rwxr-xr-x
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<?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()) {
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 && !$n->is_block()) {
while ($n = $n->get_next_sibling()) {
if ($n->is_block()) {
break;
}
if (!$n->get_first_child()) {
$n = null;
break;
}
}
}
if ($n) {
$n_style = $n->get_style();
$b = max($b, (float)$n_style->length_in_pt($n_style->margin_top, $cb["h"]));
$n_style->margin_top = "0pt";
$style->margin_bottom = $b . "pt";
}
// Collapse our first child's margin, if there is no border or padding
if ($style->get_border_top_width() == 0 && $style->length_in_pt($style->padding_top) == 0) {
$f = $this->_frame->get_first_child();
if ( $f && !$f->is_block() ) {
while ( $f = $f->get_next_sibling() ) {
if ( $f->is_block() ) {
break;
}
if ( !$f->get_first_child() ) {
$f = null;
break;
}
}
}
// Margin are collapsed only between block elements
if ($f) {
$f_style = $f->get_style();
$t = max($t, (float)$f_style->length_in_pt($f_style->margin_top, $cb["h"]));
$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->get_border_bottom_width() == 0 && $style->length_in_pt($style->padding_bottom) == 0) {
$l = $this->_frame->get_last_child();
if ($l && !$l->is_block()) {
while ( $l = $l->get_prev_sibling() ) {
if ( $l->is_block() ) {
break;
}
if ( !$l->get_last_child() ) {
$l = null;
break;
}
}
}
// Margin are collapsed only between block elements
if ($l) {
$l_style = $l->get_style();
$b = max($b, (float)$l_style->length_in_pt($l_style->margin_bottom, $cb["h"]));
$style->margin_bottom = $b."pt";
$l_style->margin_bottom = "0pt";
}
}
}
/**
* @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
$dims = array($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 = array(
$delta, $delta,
"min" => $delta,
"max" => $delta,
);
}
$low = array();
$high = array();
for ($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, array("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 $this->_min_max_cache = array($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(array("\\\n", '\\"', "\\'"),
array("", '"', "'"), $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;
}
$quotes_array = array();
foreach ($matches as $_quote) {
$quotes_array[] = $this->_parse_string($_quote[0], true);
}
if (empty($quotes_array)) {
$quotes_array = array('"', '"');
}
return array_chunk($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);
$tmp = array();
while ($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();
}
}
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