Reference - Info modes - track

<?php

  $rows = [ ['n' => 'one'], ['n' => 'two'] ];

?>

{rows}<p>{$n | upper}</p>{/rows}
<p>{sequence '1..3'}{$sequence}{/sequence}</p>

<?php

  $rows = [ ['n' => 'one'], ['n' => 'two'] ];

?>

{rows}<p>{$n | upper}</p>{/rows}
<p>{sequence '1..3'}{$sequence}{/sequence}</p>

<?php

  $rows = [ ['n' => 'one'], ['n' => 'two'] ];

?>

{rows}<p>{$n | upper}</p>{/rows}
<p>{sequence '1..3'}{$sequence}{/sequence}</p>

<?php

  $rows = [ ['n' => 'one'], ['n' => 'two'] ];

?>

{rows}<p>{$n | upper}</p>{/rows}
<p>{sequence '1..3'}{$sequence}{/sequence}</p>

<?php

  // Fetches the probe - a loop, a pipe and a sequence, rendered with four info modes on
  // and every option of each - and asserts that every mode recorded something for that very
  // request: not that artifacts exist, but that this fetch grew them.
  //
  // The xml report is the exception: each request writes it afresh. A stale tree is left
  // in its place before the fetch, so afterwards the file has to be one well-formed tree
  // without it - an engine that stops clearing the report appends to the stale tree and
  // the two roots no longer parse.

  $trackBefore = count ( glob ( DATA . 'track/requests/*' ) ?: [] );
  $xmlFile     = DATA . '_xml/compact/include/probe.xml';
  $dbBefore    = (int) padDb ( "field count(*) from track_request" );

  padFilePut ( $xmlFile, "<stale />" );

  // The xref recorder adds a page to an item's list once and skips it ever after, and the
  // list is a standing store builds never wipe - so finding the entry proved nothing about
  // this fetch. It is taken out first, has to come back, and the store is then put back
  // byte for byte, since git tracks it.

  $xrefFile = DATA . 'reference/tag/pad/sequence.txt';
  $xrefKeep = file_get_contents ( $xrefFile );

  file_put_contents ( $xrefFile, str_replace ( "regression/info;probe\n", '', $xrefKeep ) );

  libxml_use_internal_errors ( TRUE );

  $r = padCurl ( $padHost . 'regression/info/?probe&padInclude' );

  $stats = json_decode ( $r ['headers'] ['PAD-Stats'] ?? '', TRUE );

  // The recorders finish after the probe's response has already been flushed back, so the
  // growth is given a moment to land before it is read.

  for ( $settle = 0; $settle < 20; $settle++ ) {

    clearstatcache ();

    $trackAfter = count ( glob ( DATA . 'track/requests/*' ) ?: [] );
    $xmlText    = file_exists ( $xmlFile ) ? file_get_contents ( $xmlFile ) : '';
    $xmlOne     = ! str_contains ( $xmlText, '<stale' )
                  and simplexml_load_string ( $xmlText ) !== FALSE;
    $dbAfter    = (int) padDb ( "field count(*) from track_request" );
    $xref       = file_get_contents ( $xrefFile );

    if ( $trackAfter > $trackBefore
         and $xmlOne and $dbAfter > $dbBefore and str_contains ( $xref, 'regression/info;probe' ) )
      break;

    usleep ( 100000 );

  }

  file_put_contents ( $xrefFile, $xrefKeep );

  // The occurrences page, its report written in full: a loop of fields alone opens no level
  // inside it, and its two occurrences still belong in its element - the element was written
  // closed on its own line, and <occurs> after it, read as the parent's.

  $occursFile = DATA . '_xml/include/occurs.xml';

  padFilePut ( $occursFile, "<stale />" );

  padCurl ( $padHost . 'regression/info/?occurs&padInclude' );

  for ( $settle = 0; $settle < 20; $settle++ ) {

    clearstatcache ();

    $occursText = file_exists ( $occursFile ) ? file_get_contents ( $occursFile ) : '';
    $occursXml  = str_contains ( $occursText, '<stale' ) ? FALSE : simplexml_load_string ( $occursText );

    if ( $occursXml !== FALSE )
      break;

    usleep ( 100000 );

  }

  $vStats = ( is_array ( $stats ) and isset ( $stats ['total'] ) )      ? 'yes' : 'NO';
  $vTrack = ( $trackAfter > $trackBefore and $dbAfter > $dbBefore )     ? 'yes' : 'NO';
  $vXml   = ( $xmlOne )                                                 ? 'yes' : 'NO';
  $vXref  = ( str_contains ( $xref, 'regression/info;probe' ) )         ? 'yes' : 'NO';
  $vOccur = ( $occursXml !== FALSE and count ( $occursXml->xpath ( '//rows/occurs/occur' ) ) == 2 ) ? 'yes' : 'NO';

?>

<p>stats put its timings in the header: <b>{$vStats}</b></p>
<p>track filed the request, on disk and in the database: <b>{$vTrack}</b></p>
<p>xml wrote one level tree for this request: <b>{$vXml}</b></p>
<p>xml wrote the occurrences of a loop inside its element: <b>{$vOccur}</b></p>
<p>xref has the probe on record: <b>{$vXref}</b></p>

<?php

  // A loop of fields alone - no level inside it - over two rows, the xml report of this page
  // written in full, with the occurrences (_config/config.php).

  $rows = [ ['n' => 'one'], ['n' => 'two'] ];

?>

{rows}<p>{$n}</p>{/rows}