Subversion-Projekte lars-tiefland.php_share

<?php

// $Header: /cvsroot/html2ps/box.php,v 1.46 2007/05/06 18:49:29 Konstantin Exp $

// This variable is used to track the reccurrent framesets

// they can be produced by inaccurate or malicious HTML-coder

// or by some cookie- or referrer- based identification system

//

$GLOBALS['g_frame_level'] = 0;

// Called when frame node  is to be processed

function inc_frame_level() {

  global $g_frame_level;

  $g_frame_level ++;

  if ($g_frame_level > MAX_FRAME_NESTING_LEVEL) {

    trigger_error('Frame nesting too deep',

                  E_USER_ERROR);

  };

}

// Called when frame (and all nested frames, of course) processing have been completed

//

function dec_frame_level() {

  global $g_frame_level;

  $g_frame_level --;

}

// Calculate 'display' CSS property according to CSS 2.1 paragraph 9.7

// "Relationships between 'display', 'position', and 'float'"

// (The last table in that paragraph)

//

// @return flag indication of current box need a block box wrapper

//

function _fix_display_position_float(&$css_state) {

  // Specified value -> Computed value

  // inline-table -> table

  // inline, run-in, table-row-group, table-column, table-column-group, table-header-group,

  // table-footer-group, table-row, table-cell, table-caption, inline-block -> block

  // others-> same as specified

  $display = $css_state->get_property(CSS_DISPLAY);

  switch ($display) {

  case "inline-table":

    $css_state->set_property(CSS_DISPLAY, 'table');

    return false;

  case "inline":

  case "run-in":

  case "table-row-group":

  case "table-column":

  case "table-column-group":

  case "table-header-group":

  case "table-footer-group":

  case "table-row":

  case "table-cell":

  case "table-caption":

  case "inline-block":

    // Note that as we're using some non-standard display values, we need to add them to translation table

    $css_state->set_property(CSS_DISPLAY, 'block');

    return false;

    // There are display types that cannot be directly converted to block; in this case we need to create a "wrapper" floating

    // or positioned block box and put our real box into it.

  case "-button":

  case "-button-submit":

  case "-button-reset":

  case "-button-image":

  case "-checkbox":

  case "-iframe":

  case "-image":

  case "-legend":

  case "-password":

  case "-radio":

  case "-select":

  case "-text":

  case "-textarea":

    // No change

    return true;

    // Display values that are not affected by "float" property

  case "-frame":

  case "-frameset":

    // 'block' is assumed here

  default:

    // No change

    return false;

  }

}

function &create_pdf_box(&$root, &$pipeline) {

  switch ($root->node_type()) {

  case XML_DOCUMENT_NODE:

    // TODO: some magic from traverse_dom_tree

    $box =& create_document_box($root, $pipeline);

    return $box;

  case XML_ELEMENT_NODE:

    $box =& create_node_box($root, $pipeline);

    return $box;

  case XML_TEXT_NODE:

    $box =& create_text_box($root, $pipeline);

    return $box;

  default:

    die("Unsupported node type:".$root->node_type());

  }

}

function &create_document_box(&$root, &$pipeline) {

  return BlockBox::create($root, $pipeline);

}

function &create_node_box(&$root, &$pipeline) {

  // Determine CSS proerty value for current child

  $css_state =& $pipeline->get_current_css_state();

  $css_state->pushDefaultState();

  $default_css = $pipeline->get_default_css();

  $default_css->apply($root, $css_state, $pipeline);

  // Store the default 'display' value; we'll need it later when checking for impossible tag/display combination

  $handler =& CSS::get_handler(CSS_DISPLAY);

  $default_display = $handler->get($css_state->getState());

  // Initially generated boxes do not require block wrappers

  // Block wrappers are required in following cases:

  // - float property is specified for non-block box which cannot be directly converted to block box

  //   (a button, for example)

  // - display set to block for such box

  $need_block_wrapper = false;

  // TODO: some inheritance magic

  // Order is important. Items with most priority should be applied last

  // Tag attributes

  execute_attrs_before($root, $pipeline);

  // CSS stylesheet

  $css =& $pipeline->get_current_css();

  $css->apply($root, $css_state, $pipeline);

  // values from 'style' attribute

  if ($root->has_attribute("style")) {

    parse_style_attr($root, $css_state, $pipeline);

  };

  _fix_tag_display($default_display, $css_state, $pipeline);

  execute_attrs_after_styles($root, $pipeline);

  // CSS 2.1:

  // 9.7 Relationships between 'display', 'position', and 'float'

  // The three properties that affect box generation and layout —

  // 'display', 'position', and 'float' — interact as follows:

  // 1. If 'display' has the value 'none', then 'position' and 'float' do not apply.

  //    In this case, the element generates no box.

  $position_handler =& CSS::get_handler(CSS_POSITION);

  $float_handler    =& CSS::get_handler(CSS_FLOAT);

  // 2. Otherwise, if 'position' has the value 'absolute' or 'fixed', the box is absolutely positioned,

  //    the computed value of 'float' is 'none', and display is set according to the table below.

  //    The position of the box will be determined by the 'top', 'right', 'bottom' and 'left' properties and

  //    the box's containing block.

  $position = $css_state->get_property(CSS_POSITION);

  if ($position === CSS_PROPERTY_INHERIT) {

    $position = $css_state->getInheritedProperty(CSS_POSITION);

  };

  if ($position === POSITION_ABSOLUTE ||

      $position === POSITION_FIXED) {

    $float_handler->replace(FLOAT_NONE, $css_state);

    $need_block_wrapper |= _fix_display_position_float($css_state);

  };

  // 3. Otherwise, if 'float' has a value other than 'none', the box is floated and 'display' is set

  //    according to the table below.

  $float = $css_state->get_property(CSS_FLOAT);

  if ($float != FLOAT_NONE) {

    $need_block_wrapper |= _fix_display_position_float($css_state);

  };

  // Process some special nodes, which should not get their 'display' values overwritten (unless

  // current display value is 'none'

  $current_display = $css_state->get_property(CSS_DISPLAY);

  if ($current_display != 'none') {

    switch ($root->tagname()) {

    case 'body':

      $handler =& CSS::get_handler(CSS_DISPLAY);

      $handler->css('-body', $pipeline);

      break;

    case 'br':

      $handler =& CSS::get_handler(CSS_DISPLAY);

      $handler->css('-break', $pipeline);

      break;

    case 'img':

      $handler =& CSS::get_handler(CSS_DISPLAY);

      $need_block_wrapper |= ($handler->get($css_state->getState()) == 'block');

      $handler->css('-image', $pipeline);

      break;

    };

  };

  // 4. Otherwise, if the element is the root element, 'display' is set according to the table below.

  // 5. Otherwise, the remaining 'display' property values apply as specified. (see _fix_display_position_float)

  switch($css_state->get_property(CSS_DISPLAY)) {

  case 'block':

    $box =& BlockBox::create($root, $pipeline);

    break;

  case '-break':

    $box =& BRBox::create($pipeline);

    break;

  case '-body':

    $box =& BodyBox::create($root, $pipeline);

    break;

  case '-button':

    $box =& ButtonBox::create($root, $pipeline);

    break;

  case '-button-reset':

    $box =& ButtonResetBox::create($root, $pipeline);

    break;

  case '-button-submit':

    $box =& ButtonSubmitBox::create($root, $pipeline);

    break;

  case '-button-image':

    $box =& ButtonImageBox::create($root, $pipeline);

    break;

  case '-checkbox':

    $box =& CheckBox::create($root, $pipeline);

    break;

  case '-form':

    $box =& FormBox::create($root, $pipeline);

    break;

  case '-frame':

    inc_frame_level();

    $box =& FrameBox::create($root, $pipeline);

    dec_frame_level();

    break;

  case '-frameset':

    inc_frame_level();

    $box =& FramesetBox::create($root, $pipeline);

    dec_frame_level();

    break;

  case '-iframe':

    inc_frame_level();

    $box =& IFrameBox::create($root, $pipeline);

    dec_frame_level();

    break;

  case '-textarea':

    $box =& TextAreaInputBox::create($root, $pipeline);

    break;

  case '-image':

    $box =& IMGBox::create($root, $pipeline);

    break;

  case 'inline':

    $box =& InlineBox::create($root, $pipeline);

    break;

  case 'inline-block':

    $box =& InlineBlockBox::create($root, $pipeline);

    break;

  case '-legend':

    $box =& LegendBox::create($root, $pipeline);

    break;

  case 'list-item':

    $box =& ListItemBox::create($root, $pipeline);

    break;

  case 'none':

    $box =& NullBox::create();

    break;

  case '-radio':

    $box =& RadioBox::create($root, $pipeline);

    break;

  case '-select':

    $box =& SelectBox::create($root, $pipeline);

    break;

  case 'table':

    $box =& TableBox::create($root, $pipeline);

    break;

  case 'table-cell':

    $box =& TableCellBox::create($root, $pipeline);

    break;

  case 'table-row':

    $box =& TableRowBox::create($root, $pipeline);

    break;

  case 'table-row-group':

  case 'table-header-group':

  case 'table-footer-group':

    $box =& TableSectionBox::create($root, $pipeline);

    break;

  case '-text':

    $box =& TextInputBox::create($root, $pipeline);

    break;

  case '-password':

    $box =& PasswordInputBox::create($root, $pipeline);

    break;

  default:

    /**

     * If 'display' value is invalid or unsupported, fall back to 'block' mode

     */

    error_log("Unsupported 'display' value: ".$css_state->get_property(CSS_DISPLAY));

    $box =& BlockBox::create($root, $pipeline);

    break;

  }

  // Now check if pseudoelement should be created; in this case we'll use the "inline wrapper" box

  // containing both generated box and pseudoelements

  //

  $pseudoelements = $box->get_css_property(CSS_HTML2PS_PSEUDOELEMENTS);

  if ($pseudoelements & CSS_HTML2PS_PSEUDOELEMENTS_BEFORE) {

    // Check if :before preudoelement exists

    $before =& create_pdf_pseudoelement($root, SELECTOR_PSEUDOELEMENT_BEFORE, $pipeline);

    if (!is_null($before)) {

      $box->insert_child(0, $before);

    };

  };

  if ($pseudoelements & CSS_HTML2PS_PSEUDOELEMENTS_AFTER) {

    // Check if :after pseudoelement exists

    $after =& create_pdf_pseudoelement($root, SELECTOR_PSEUDOELEMENT_AFTER, $pipeline);

    if (!is_null($after)) {

      $box->add_child($after);

    };

  };

  // Check if this box needs a block wrapper (for example, floating button)

  // Note that to keep float/position information, we clear the CSS stack only

  // AFTER the wrapper box have been created; BUT we should clear the following CSS properties

  // to avoid the fake wrapper box actually affect the layout:

  // - margin

  // - border

  // - padding

  // - background

  //

  if ($need_block_wrapper) {

    /**

     * Clear POSITION/FLOAT properties on wrapped boxes

     */

    $box->setCSSProperty(CSS_POSITION, POSITION_STATIC);

    $box->setCSSProperty(CSS_POSITION, FLOAT_NONE);

    $wc = $box->get_css_property(CSS_WIDTH);

    // Note that if element width have been set as a percentage constraint and we're adding a block wrapper,

    // then we need to:

    // 1. set the same percentage width constraint to the wrapper element (will be done implicilty if we will not

    // modify the 'width' CSS handler stack

    // 2. set the wrapped element's width constraint to 100%, otherwise it will be narrower than expected

    if ($wc->isFraction()) {

      $box->setCSSProperty(CSS_WIDTH, new WCFraction(1));

    }

    $handler =& CSS::get_handler(CSS_MARGIN);

    $box->setCSSProperty(CSS_MARGIN, $handler->default_value());

    /**

     * Note:  default border does  not contain  any fontsize-dependent

     * values, so we may safely use zero as a base font size

     */

    $border_handler =& CSS::get_handler(CSS_BORDER);

    $value = $border_handler->default_value();

    $value->units2pt(0);

    $box->setCSSProperty(CSS_BORDER, $value);

    $handler =& CSS::get_handler(CSS_PADDING);

    $box->setCSSProperty(CSS_PADDING, $handler->default_value());

    $handler =& CSS::get_handler(CSS_BACKGROUND);

    $box->setCSSProperty(CSS_BACKGROUND, $handler->default_value());

    // Create "clean" block box

    $wrapper =& new BlockBox();

    $wrapper->readCSS($pipeline->get_current_css_state());

    $wrapper->add_child($box);

    // Remove CSS propery values from stack

    execute_attrs_after($root, $pipeline);

    $css_state->popState();

    return $wrapper;

  } else {

    // Remove CSS propery values from stack

    execute_attrs_after($root, $pipeline);

    $css_state->popState();

    $box->set_tagname($root->tagname());

    return $box;

  };

}

function &create_text_box(&$root, &$pipeline) {

  // Determine CSS property value for current child

  $css_state =& $pipeline->get_current_css_state();

  $css_state->pushDefaultTextState();

  /**

   * No text boxes generated by empty text nodes.

   * Note that nodes containing spaces only are NOT empty, as they may

   * correspond, for example, to whitespace between tags.

   */

  if ($root->content !== "") {

    $box =& InlineBox::create($root, $pipeline);

  } else {

    $box = null;

  }

  // Remove CSS property values from stack

  $css_state->popState();

  return $box;

}

function &create_pdf_pseudoelement($root, $pe_type, &$pipeline) {

  // Store initial values to CSS stack

  $css_state =& $pipeline->get_current_css_state();

  $css_state->pushDefaultState();

  // Initially generated boxes do not require block wrappers

  // Block wrappers are required in following cases:

  // - float property is specified for non-block box which cannot be directly converted to block box

  //   (a button, for example)

  // - display set to block for such box

  $need_block_wrapper = false;

  $css =& $pipeline->get_current_css();

  $css->apply_pseudoelement($pe_type, $root, $css_state, $pipeline);

  // Now, if no content found, just return

  //

  $content_obj = $css_state->get_property(CSS_CONTENT);

  if ($content_obj === CSS_PROPERTY_INHERIT) {

    $content_obj = $css_state->getInheritedProperty(CSS_CONTENT);

  };

  $content = $content_obj->render($pipeline->get_counters());

  if ($content === '') {

    $css_state->popState();

    $dummy = null;

    return $dummy;

  };

  // CSS 2.1:

  // 9.7 Relationships between 'display', 'position', and 'float'

  // The three properties that affect box generation and layout —

  // 'display', 'position', and 'float' — interact as follows:

  // 1. If 'display' has the value 'none', then 'position' and 'float' do not apply.

  //    In this case, the element generates no box.

  // 2. Otherwise, if 'position' has the value 'absolute' or 'fixed', the box is absolutely positioned,

  //    the computed value of 'float' is 'none', and display is set according to the table below.

  //    The position of the box will be determined by the 'top', 'right', 'bottom' and 'left' properties and

  //    the box's containing block.

  $position_handler =& CSS::get_handler(CSS_POSITION);

  $float_handler    =& CSS::get_handler(CSS_FLOAT);

  $position = $position_handler->get($css_state->getState());

  if ($position === CSS_PROPERTY_INHERIT) {

    $position = $css_state->getInheritedProperty(CSS_POSITION);

  };

  if ($position === POSITION_ABSOLUTE || $position === POSITION_FIXED) {

    $float_handler->replace(FLOAT_NONE);

    $need_block_wrapper |= _fix_display_position_float($css_state);

  };

  // 3. Otherwise, if 'float' has a value other than 'none', the box is floated and 'display' is set

  //    according to the table below.

  $float = $float_handler->get($css_state->getState());

  if ($float != FLOAT_NONE) {

    $need_block_wrapper |= _fix_display_position_float($css_state);

  };

  // 4. Otherwise, if the element is the root element, 'display' is set according to the table below.

  // 5. Otherwise, the remaining 'display' property values apply as specified. (see _fix_display_position_float)

  // Note that pseudoelements may get only standard display values

  $display_handler =& CSS::get_handler(CSS_DISPLAY);

  $display = $display_handler->get($css_state->getState());

  switch ($display) {

  case 'block':

    $box =& BlockBox::create_from_text($content, $pipeline);

    break;

  case 'inline':

    $ws_handler =& CSS::get_handler(CSS_WHITE_SPACE);

    $box =& InlineBox::create_from_text($content,

                                        $ws_handler->get($css_state->getState()),

                                        $pipeline);

    break;

  default:

    die('Unsupported "display" value: '.$display_handler->get($css_state->getState()));

  }

  // Check if this box needs a block wrapper (for example, floating button)

  // Note that to keep float/position information, we clear the CSS stack only

  // AFTER the wrapper box have been created; BUT we should clear the following CSS properties

  // to avoid the fake wrapper box actually affect the layout:

  // - margin

  // - border

  // - padding

  // - background

  //

  if ($need_block_wrapper) {

    $handler =& CSS::get_handler(CSS_MARGIN);

    $handler->css("0",$pipeline);

    pop_border();

    push_border(default_border());

    pop_padding();

    push_padding(default_padding());

    $handler =& CSS::get_handler(CSS_BACKGROUND);

    $handler->css('transparent',$pipeline);

    // Create "clean" block box

    $wrapper =& new BlockBox();

    $wrapper->readCSS($pipeline->get_current_css_state());

    $wrapper->add_child($box);

    $css_state->popState();

    return $wrapper;

  } else {

    $css_state->popState();

    return $box;

  };

}

function is_inline(&$box) {

  if (is_a($box, "TextBox")) { return true; };

  $display = $box->get_css_property(CSS_DISPLAY);

  return

    $display === '-button' ||

    $display === '-button-reset' ||

    $display === '-button-submit' ||

    $display === '-button-image' ||

    $display === '-checkbox' ||

    $display === '-image' ||

    $display === 'inline' ||

    $display === 'inline-block' ||

    $display === 'none' ||

    $display === '-radio' ||

    $display === '-select' ||

    $display === '-text' ||

    $display === '-password';

}

function is_whitespace(&$box) {

  return

    is_a($box, "WhitespaceBox") ||

    is_a($box, "NullBox");

}

function is_container(&$box) {

  return is_a($box, "GenericContainerBox") &&

    !is_a($box, "GenericInlineBox") ||

    is_a($box, "InlineBox");

}

function is_span(&$box) {

  return is_a($box, "InlineBox");

}

function is_table_cell(&$box) {

  return is_a($box, "TableCellBox");

}

?>