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<?php
/**
* @package dompdf
* @link https://github.com/dompdf/dompdf
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
namespace Dompdf\FrameDecorator;
use Dompdf\Dompdf;
use Dompdf\Frame;
use Dompdf\Exception;
/**
* Decorates Frame objects for text layout
*
* @package dompdf
*/
class Text extends AbstractFrameDecorator
{
/**
* @var float
*/
protected $text_spacing;
/**
* @var string|null
*/
protected $mapped_font;
/**
* Saves trailing whitespace trimmed after a line break, so it can be
* restored when needed.
*
* @var string|null
*/
protected $trailingWs = null;
/**
* Text constructor.
* @param Frame $frame
* @param Dompdf $dompdf
* @throws Exception
*/
function __construct(Frame $frame, Dompdf $dompdf)
{
if (!$frame->is_text_node()) {
throw new Exception("Text_Decorator can only be applied to #text nodes.");
}
parent::__construct($frame, $dompdf);
$this->text_spacing = 0.0;
}
/**
* Trim trailing white space from the frame text.
*/
public function trim_trailing_ws(): void
{
$frame = $this->_frame;
$text = $this->get_text();
$trailing = mb_substr($text, -1, null, "UTF-8");
// White space is always collapsed to the standard space character
// currently, so only handle that for now
if ($trailing === " ") {
$this->trailingWs = $trailing;
$this->set_text(mb_substr($text, 0, -1, "UTF-8"));
$this->recalculate_width();
}
}
function reset()
{
parent::reset();
$this->text_spacing = 0.0;
$this->mapped_font = null;
// Restore trimmed trailing white space, as the frame will go through
// another reflow and line breaks might be different after a split
if ($this->trailingWs !== null) {
$text = $this->get_text();
$this->set_text($text . $this->trailingWs);
$this->trailingWs = null;
}
}
// Accessor methods
/**
* @return float
*/
public function get_text_spacing(): float
{
return $this->text_spacing;
}
/**
* @return string
*/
function get_text()
{
// FIXME: this should be in a child class (and is incorrect)
// if ( $this->_frame->get_style()->content !== "normal" ) {
// $this->_frame->get_node()->data = $this->_frame->get_style()->content;
// $this->_frame->get_style()->content = "normal";
// }
// Helpers::pre_r("---");
// $style = $this->_frame->get_style();
// var_dump($text = $this->_frame->get_node()->data);
// var_dump($asc = utf8_decode($text));
// for ($i = 0; $i < strlen($asc); $i++)
// Helpers::pre_r("$i: " . $asc[$i] . " - " . ord($asc[$i]));
// Helpers::pre_r("width: " . $this->_dompdf->getFontMetrics()->getTextWidth($text, $style->font_family, $style->font_size));
return $this->_frame->get_node()->data;
}
//........................................................................
/**
* Vertical padding, border, and margin do not apply when determining the
* height for inline frames.
*
* http://www.w3.org/TR/CSS21/visudet.html#inline-non-replaced
*
* The vertical padding, border and margin of an inline, non-replaced box
* start at the top and bottom of the content area, not the
* 'line-height'. But only the 'line-height' is used to calculate the
* height of the line box.
*
* @return float
*/
public function get_margin_height(): float
{
// This function is also called in add_frame_to_line() and is used to
// determine the line height
$style = $this->get_style();
$font = $style->font_family;
$size = $style->font_size;
$fontHeight = $this->_dompdf->getFontMetrics()->getFontHeight($font, $size);
return ($style->line_height / ($size > 0 ? $size : 1)) * $fontHeight;
}
public function get_padding_box(): array
{
$style = $this->_frame->get_style();
$pb = $this->_frame->get_padding_box();
$pb[3] = $pb["h"] = (float) $style->length_in_pt($style->height);
return $pb;
}
/**
* @param float $spacing
*/
public function set_text_spacing(float $spacing): void
{
$this->text_spacing = $spacing;
$this->recalculate_width();
}
/**
* Recalculate the text width
*
* @return float
*/
public function recalculate_width(): float
{
$fontMetrics = $this->_dompdf->getFontMetrics();
$style = $this->get_style();
$text = $this->get_text();
$font = $style->font_family;
$size = $style->font_size;
$word_spacing = $this->text_spacing + $style->word_spacing;
$letter_spacing = $style->letter_spacing;
$text_width = $fontMetrics->getTextWidth($text, $font, $size, $word_spacing, $letter_spacing);
$style->set_used("width", $text_width);
return $text_width;
}
// Text manipulation methods
/**
* Split the text in this frame at the offset specified. The remaining
* text is added as a sibling frame following this one and is returned.
*
* @param int $offset
* @param bool $split_parent Whether to split parent inline frames.
*
* @return Text|null
*/
function split_text(int $offset, bool $split_parent = true): ?self
{
if ($offset === 0) {
return null;
}
$split = $this->_frame->get_node()->splitText($offset);
if ($split === false) {
return null;
}
/** @var Text */
$deco = $this->copy($split);
$style = $this->_frame->get_style();
$split_style = $deco->get_style();
if ($this->mapped_font !== null) {
$split_style->set_used("font_family", $this->mapped_font);
$deco->mapped_font = $this->mapped_font;
}
// Clear decoration widths at the split point. They might have been
// copied from the parent frame during inline reflow
$style->margin_right = 0.0;
$style->padding_right = 0.0;
$style->border_right_width = 0.0;
$split_style->margin_left = 0.0;
$split_style->padding_left = 0.0;
$split_style->border_left_width = 0.0;
$p = $this->get_parent();
$p->insert_child_after($deco, $this, false);
if ($split_parent && $p instanceof Inline) {
$p->split($deco);
}
return $deco;
}
/**
* @param int $offset
* @param int $count
*/
function delete_text($offset, $count)
{
$this->_frame->get_node()->deleteData($offset, $count);
}
/**
* @param string $text
*/
function set_text($text)
{
$this->_frame->get_node()->data = $text;
}
/**
* Determines the optimal font that applies to the frame and splits
* the frame where the optimal font changes.
*/
function apply_font_mapping(): void
{
if ($this->mapped_font !== null) {
return;
}
$fontMetrics = $this->_dompdf->getFontMetrics();
$style = $this->get_style();
$families = $style->get_font_family_computed();
$subtype = $fontMetrics->getType($style->font_weight . ' ' . $style->font_style);
$charMapping = $fontMetrics->mapTextToFonts($this->get_text(), $families, $subtype, 1);
if (isset($charMapping[0])) {
if ($charMapping[0]["length"] !== 0) {
$this->split_text($charMapping[0]["length"], false);
}
$mapped_font = $charMapping[0]["font"];
if ($mapped_font !== null) {
$style->set_used("font_family", $mapped_font);
$this->mapped_font = $mapped_font;
}
}
}
}