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Sort switch statement cases in getTextArray()
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Make the cases a little bit more alphabetical. Remove cases/commands that aren't relevant to getting and positioning text.
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@GreyWyvern
GreyWyvern committed Aug 22, 2023
1 parent 393c084 commit 097bea3
Showing 1 changed file with 89 additions and 119 deletions.
208 changes: 89 additions & 119 deletions src/Smalot/PdfParser/PDFObject.php
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Original file line number Diff line number Diff line change
Expand Up @@ -536,6 +536,7 @@ public function getTextArray(Page $page = null): array
$commands = $this->getCommandsText($section);
foreach ($commands as $command) {
switch ($command[self::OPERATOR]) {
// Begin text object
case 'BT':
// Reset text positioning matrices
$current_position_tm = [
Expand All @@ -546,59 +547,6 @@ public function getTextArray(Page $page = null): array
$current_position_td = ['x' => 0, 'y' => 0];
break;

case 'ET':
break;

// set character spacing
case 'Tc':
break;

// move text current point and set leading
case 'TD':
case 'Td':
// move text current point
$args = preg_split('/\s+/s', $command[self::COMMAND]);
$y = (float) array_pop($args);
$x = (float) array_pop($args);

$current_position_td = [
'x' => $current_position_td['x'] + $x * $current_position_tm['a'] + $x * $current_position_tm['i'],
'y' => $current_position_td['y'] + $y * $current_position_tm['b'] + $y * $current_position_tm['j'],
];
break;

case 'Tf':
list($id) = preg_split('/\s/s', $command[self::COMMAND]);
$id = trim($id, '/');
if (null !== $page) {
$new_font = $page->getFont($id);
// If an invalid font ID is given, do not update the font.
// This should theoretically never happen, as the PDF spec states for the Tf operator:
// "The specified font value shall match a resource name in the Font entry of the default resource dictionary"
// (https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf, page 435)
// But we want to make sure that malformed PDFs do not simply crash.
if (null !== $new_font) {
$current_font = $new_font;
}
}
break;

// Store current selected font and graphics matrix
case 'q':
$clipped_font[] = $current_font;
$clipped_position_cm[] = $current_position_cm;
break;

// Restore previous selected font and graphics matrix
case 'Q':
$current_font = array_pop($clipped_font);
$current_position_cm = array_pop($clipped_position_cm);
break;

case 'DP':
case 'MP':
break;

// Begin marked content sequence with property list
case 'BDC':
if (preg_match('/(<<.*>>)$/', $command[self::COMMAND], $match)) {
Expand Down Expand Up @@ -638,6 +586,51 @@ public function getTextArray(Page $page = null): array
}
break;

// set graphics position matrix
case 'cm':
$args = preg_split('/\s+/s', $command[self::COMMAND]);
$current_position_cm = [
'a' => (float) $args[0], 'b' => (float) $args[1], 'c' => 0,
'i' => (float) $args[2], 'j' => (float) $args[3], 'k' => 0,
'x' => (float) $args[4], 'y' => (float) $args[5], 'z' => 1,
];
break;

case 'Do':
if (null !== $page) {
$args = preg_split('/\s/s', $command[self::COMMAND]);
$id = trim(array_pop($args), '/ ');
$xobject = $page->getXObject($id);

// @todo $xobject could be a ElementXRef object, which would then throw an error
if (\is_object($xobject) && $xobject instanceof self && !\in_array($xobject->getUniqueId(), self::$recursionStack)) {
// Not a circular reference.
$text[] = $xobject->getText($page);
}
}
break;

// Marked content point with (DP) & without (MP) property list
case 'DP':
case 'MP':
break;

// End text object
case 'ET':
break;

// Store current selected font and graphics matrix
case 'q':
$clipped_font[] = $current_font;
$clipped_position_cm[] = $current_position_cm;
break;

// Restore previous selected font and graphics matrix
case 'Q':
$current_font = array_pop($clipped_font);
$current_position_cm = array_pop($clipped_position_cm);
break;

// End marked content sequence
case 'EMC':
$data = false;
Expand Down Expand Up @@ -779,20 +772,51 @@ public function getTextArray(Page $page = null): array
}
break;

// set leading
case 'TL':
// move to start of next line
case 'T*':
$current_position['x'] = 0;
$current_position_td['x'] = 0;
$current_position_td['y'] += 10;
break;

// set graphics position matrix
case 'cm':
// set character spacing
case 'Tc':
break;

// move text current point and set leading
case 'Td':
case 'TD':
// move text current point
$args = preg_split('/\s+/s', $command[self::COMMAND]);
$current_position_cm = [
'a' => (float) $args[0], 'b' => (float) $args[1], 'c' => 0,
'i' => (float) $args[2], 'j' => (float) $args[3], 'k' => 0,
'x' => (float) $args[4], 'y' => (float) $args[5], 'z' => 1,
$y = (float) array_pop($args);
$x = (float) array_pop($args);

$current_position_td = [
'x' => $current_position_td['x'] + $x * $current_position_tm['a'] + $x * $current_position_tm['i'],
'y' => $current_position_td['y'] + $y * $current_position_tm['b'] + $y * $current_position_tm['j'],
];
break;

case 'Tf':
list($id) = preg_split('/\s/s', $command[self::COMMAND]);
$id = trim($id, '/');
if (null !== $page) {
$new_font = $page->getFont($id);
// If an invalid font ID is given, do not update the font.
// This should theoretically never happen, as the PDF spec states for the Tf operator:
// "The specified font value shall match a resource name in the Font entry of the default resource dictionary"
// (https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf, page 435)
// But we want to make sure that malformed PDFs do not simply crash.
if (null !== $new_font) {
$current_font = $new_font;
}
}
break;

// set leading
case 'TL':
break;

// set text position matrix
case 'Tm':
$args = preg_split('/\s+/s', $command[self::COMMAND]);
Expand All @@ -803,6 +827,10 @@ public function getTextArray(Page $page = null): array
];
break;

// set text rendering mode
case 'Ts':
break;

// set super/subscripting text rise
case 'Ts':
break;
Expand All @@ -815,64 +843,6 @@ public function getTextArray(Page $page = null): array
case 'Tz':
break;

// move to start of next line
case 'T*':
$current_position['x'] = 0;
$current_position_td['x'] = 0;
$current_position_td['y'] += 10;
break;

case 'Da':
break;

case 'Do':
if (null !== $page) {
$args = preg_split('/\s/s', $command[self::COMMAND]);
$id = trim(array_pop($args), '/ ');
$xobject = $page->getXObject($id);

// @todo $xobject could be a ElementXRef object, which would then throw an error
if (\is_object($xobject) && $xobject instanceof self && !\in_array($xobject->getUniqueId(), self::$recursionStack)) {
// Not a circular reference.
$text[] = $xobject->getText($page);
}
}
break;

case 'rg':
case 'RG':
break;

case 're':
break;

case 'co':
break;

case 'cs':
break;

case 'gs':
break;

case 'en':
break;

case 'sc':
case 'SC':
break;

case 'g':
case 'G':
break;

case 'V':
break;

case 'vo':
case 'Vo':
break;

default:
}
}
Expand Down

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