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NITF.php
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PHP Script
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2004-03-24
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748 lines
<?php
/* vim: set expandtab tabstop=4 softtabstop=4 shiftwidth=4: */
// +----------------------------------------------------------------------+
// | PHP version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 2003-2004 TownNews.com |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.0 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Patrick O'Lone <polone@townnews.com> |
// +----------------------------------------------------------------------+
//
// NITF.php,v 1.2 2003/05/29 19:02:08 polone Exp
require_once('XML/Parser.php');
/**
* Generic NITF Parser class
*
* This class provides basic NITF parsing. Many of the major elements of the NITF
* standard are supported. This implementation is based off the NITF 3.1 DTD,
* publicly available at the following URL:
*
* http://www.nitf.org/site/nitf-documentation/nitf-3-1.dtd
*
* Note that not all elements of this standard are not supported.
*
* @author Patrick O'Lone <polone@townnews.com>
* @version 1.2
* @package XML
*/
class XML_NITF extends XML_Parser
{
/**
* @var array
* Document metadata. Container for metadata information about this
* particular document.
* @see getDocData()
* @access private
*/
var $m_kDocData = array('key-list' => array());
/**
* @var array
* Information about specific instance of an item's publication. Contains
* metadata about how the particular news object was used in a specific
* instance.
* @see getPubData()
* @access private
*/
var $m_kPubData = array();
/**
* @var array
* Information about the creative history of the document; also used as an
* audit trail. Includes who made changes, when the changes were made, and
* why. Each element of the array is a key-based array that corresponds to
* the <revision-history> element.
* @see getRevision()
* @access private
*/
var $m_akRevisions = array();
/**
* @var array
* The various headlines that were found in the document. The headlines are
* keyed by the levels of HLX. The default hedline (if no level is found) is
* HL1.
* @see getHedlines()
* @access private
*/
var $m_kHedlines = array( 'HL1' => null, 'HL2' => array() );
/**
* @var string
* Story abstract summary or synopsis of the contents of the document.
* @access private
*/
var $m_sAbstract = null;
/**
* @var string
* Significant place mentioned in an article. Used to normalize locations.
* The location in this variable is the place where the story's events will
* or have unfolded.
* @access private
*/
var $m_sLocation = null;
/**
* @var string
* Information distributor. May or may not be the owner or creator.
* @access private
*/
var $m_sDistributor = null;
/**
* @var string
* The elements of the byline, including the author's name and title.
* @see getByline()
* @access private
*/
var $m_kByline = array( 'author' => null, 'title' => null );
/**
* @var array
* An array of paragraphs extracted from the document
* @see getLede(), getContent()
* @access private
*/
var $m_aContent = array();
/**
* @var array
* A list of media reference elements as found in the body section of the
* document. Each element is an array itself with keyed properties related
* to media element in question.
* @see getMedia()
* @access private
*/
var $m_aMedia = array();
/**
* @var array
* A list of tags that were parsed (in order) denoting the current sequence
* of tags that were parsed. This is array is used for parsing the document
* elements in a particular order (if needed).
* @see StartHandler(), EndHandler(), cdataHandler()
* @access private
*/
var $m_aParentTags = array();
/**
* @var string
* A byline at the end of a story. Example: Stuart Myles contributed to this
* article.
* @see getTagline()
* @access private
*/
var $m_sTagline = null;
/**
* @var string
* Free-form bibliographic data. Used to elaborate on the source of
* information.
* @see getBibliography()
* @access private
*/
var $m_sBibliography = null;
/**
* Access all or specific elements of the <docdata> block
*
* @return mixed
* All of the elements from the <docdata> block will be returned if a specific
* property is not provided. If a specific property is requested and is found
* in the docdata block, then that property will be returned. If the property
* cannot be found, null is returned.
*
* @param string
* The property of the <docdata> block to return, the most common being:
*
* "doc-id" - a unique identifier of this document (string)
* "key-list" - a list of keywords provided with the document (array)
* "copyright" - the copyright holder (string)
* "series" - if the document is part of series (string)
* "urgency" - a number between 1 (urgent) and 8 (not urgent) (integer)
* "date.issue" - date the document was issued (UNIX timestamp)
* "date.release" - date the document is publicly available (UNIX timestamp)
* "date.expires" - date the document is no longer valid (UNIX timestamp)
*
* @see getDocDataElement()
* @access public
*/
function getDocData( $sProperty = null )
{
if (!empty($sProperty)) {
$sProperty = strtolower($sProperty);
if (isset($this->m_kDocData[$sProperty])) {
return $this->m_kDocData[$sProperty];
}
return null;
}
return $this->m_kDocData;
}
/**
* Returns all elements or a specific element from the <pubdata> block
*
* @return mixed
* Returns string, numeric, or array values depending on the property being
* accessed from the <pubdata> block.
*
* @access public
*/
function getPubData( $sProperty = null )
{
if (!empty($sProperty)) {
$sProperty = strtolower($sProperty);
if (isset($this->m_kPubData[$sProperty])) {
return $this->m_kPubData[$sProperty];
}
return null;
}
return $this->m_kPubData;
}
/**
* Get the revision history
*
* @return array
* An array containing key-value arrays. The properties of each array element
* in this array are:
*
* "comment" - Reason for the revision
* "function" - Job function of individual performing revision
* "name" - Name of the person who made the revision
* "norm" - Date of the revision
*
* @access public
*/
function getRevision()
{
return $this->m_akRevisions;
}
/**
* Retrieve all headlines or a single headline denoted by key
*
* @return mixed
* Returns an array if no specific headline element is requested, or a string
* if the specific headline element requested exists
*
* @param string
* The key value corresponding to the headline to be retrieved
*
* @access public
*/
function getHeadline( $nLevel = 1 )
{
return $this->m_kHedlines["HL$nLevel"];
}
/**
* Return information about the author of a document
*
* @param string
* The field of the byline to retrieve.
*
* @access public
*/
function getByline( $sProperty = 'author' )
{
$sProperty = strtolower($sProperty);
if (isset($this->m_kByline[$sProperty])) {
return $this->m_kByline[$sProperty];
}
return null;
}
/**
* Query for a list of related media elements
*
* @return array
* Returns an array of all media reference data, or an array of select media
* reference data determined by the property parameter passed.
*
* @param string
* If supplied, only this property will be returned for each element of the
* media reference array.
*
* @access public
*/
function getMedia( $sProperty = null )
{
if (empty($sProperty)) {
return $this->m_aMedia;
} else {
$aMediaRefs = array();
foreach($this->m_aMedia as $aMediaElement) {
if (isset($aMediaElem[$sProperty])) {
array_push($aMediaRefs, $aMediaElem[$sProperty]);
}
}
return $aMediaRefs;
}
}
/**
* Returns the lede (sometimes called lead) paragraph
*
* @return string
* Returns the lede paragraph if it is defined, or null otherwise
*
* @access public
*/
function getLede()
{
if (isset($this->m_aContent[0])) {
return $this->m_aContent[0];
}
return null;
}
/**
* Returns the paragraphs of content
*
* @return array
* An array of elements that represent a single paragraph each
*
* @access public
*/
function &getContent()
{
return $this->m_aContent;
}
/**
* Returns the tag line (if one exists)
*
* @return string
* The tag line extracted from the NITF data source
*
* @access public
*/
function getTagline()
{
return $this->m_sTagline;
}
/**
* Returns the free-form bibliographic data
*
* @return string
* The bibliography (if one exists) is returned
*
* @access public
*/
function getBibliography()
{
return $this->m_sBibliography;
}
/**
* Get a string version of the article
*
* @return string
* A string representing the main headline, author, content, and tagline.
*
* @param string
* The character(s) used to separate each article element in the string that
* is returned - often referred to as the CRLF.
*
* @access public
*/
function &toString( $sCRLF = "\n" )
{
$sArticle = "{$this->m_kHedlines['HL1']}$sCRLF";
if (!empty($this->m_kByline['author'])) {
$sArticle .= "{$this->m_kByline['author']}$sCRLF";
}
if (!empty($this->m_sLocation)) {
$sArticle .= "{$this->m_sLocation} - ";
}
$sArticle .= join($sCRLF, $this->m_aContent);
if (!empty($this->m_sTagline)) {
$sArticle .= "$sCRLF{$this->m_sTagline}";
}
return $sArticle;
}
/**
* Handle start XML elements and attributes
*
* When a new element is begun, this handler is executed.
*
* @param object
* The XML parser object instance that was inherited from the XML_Parser
* class
*
* @param string
* A tag element from the XML data stream
*
* @param array
* An array of XML attributes associated with the given tag supplied
*
* @access private
*/
function StartHandler($oParser, $sName, $kAttrib )
{
// Push the element into the stack of XML elements already visited
array_push($this->m_aParentTags, $sName);
// Handle the attributes of the XML tags
switch ($sName) {
case 'HL2':
$this->_sHedline = null;
break;
case 'P':
if (!empty($kAttrib['LEDE']) && ($kAttrib['LEDE'] == 'true')) {
$this->_bIsLede = true;
}
$this->_sContent = null;
break;
case 'DOC.COPYRIGHT':
$this->m_sCopyright = $kAttrib['HOLDER'];
break;
case 'MEDIA':
$this->_kMedia = array();
if (!empty($kAttrib['MEDIA-TYPE'])) {
$this->_kMedia['type'] = $kAttrib['MEDIA-TYPE'];
} else {
$this->_kMedia['type'] = 'other';
}
$this->_kMedia['source'] = null;
$this->_kMedia['mime-type'] = null;
$this->_kMedia['caption'] = null;
$this->_kMedia['data'] = null;
$this->_kMedia['encoding'] = null;
$this->_kMedia['producer'] = null;
$this->_kMedia['meta'] = array();
break;
case 'MEDIA-REFERENCE':
if (!empty($kAttrib['SOURCE'])) {
$this->_kMedia['source'] = $kAttrib['SOURCE'];
// Compatibility with the AP Usenet feed - note that this is a non
// standard attribute and is NOT a part of NITF standards
} elseif (!empty($kAttrib['DATA-LOCATION'])) {
$this->_kMedia['source'] = $kAttrib['DATA-LOCATION'];
}
$this->_kMedia['mime-type'] = $kAttrib['MIME-TYPE'];
break;
case 'MEDIA-OBJECT':
$this->_kMedia['encoding'] = $kAttrib['ENCODING'];
break;
case 'MEDIA-METADATA':
if (!empty($kAttrib['NAME'])) {
$this->_kMedia[$kAttrib['NAME']] = $kAttrib['VALUE'];
}
break;
case 'PUBDATA':
foreach ($kAttrib as $sKey => $sValue) {
$this->m_kPubData[strtolower($sKey)] = $sValue;
}
break;
case 'DOC-ID':
$this->m_kDocData['doc-id'] = $kAttrib['ID-STRING'];
break;
// The list of keywords or phrases are just added to the array of
// keywords.
case 'KEYWORD':
if (empty($this->m_kDocData['key-list'])) {
$this->m_kDocData['key-list'] = array();
}
array_push($this->m_kDocData['key-list'], $kAttrib['KEY']);
break;
// The release, expiration, and issuing dates of this article. The
// ISO-8601 time stamp settings are preserved, but you can use the
// magic function strtotime() to convert these to time stamp values.
case 'DATE.RELEASE':
case 'DATE.EXPIRE':
case 'DATE.ISSUE':
if (!empty($kAttrib['NORM'])) {
$sName = strtolower($sName);
$this->m_kDocData[$sName] = $kAttrib['NORM'];
}
break;
case 'REVISION-HISTORY':
array_push($this->m_akRevisions, array_change_key_case($kAttrib, CASE_LOWER));
break;
}
}
/**
* Called when a tag element ends
*
* @param object
* The parser object parsing the XML data
*
* @param string
* The name of the tag element that has just ended
*
* @access private
*/
function EndHandler( $oParser, $sName )
{
switch ( $sName ) {
case 'HL1':
$this->m_kHedlines['HL1'] = trim($this->m_kHedlines['HL1']);
break;
case 'HL2':
array_push($this->m_kHedlines['HL2'], trim($this->_sHedline));
unset($this->_sHedline);
break;
case 'P':
if (isset($this->_bIsLede)) {
array_unshift($this->m_aContent, trim($this->_sContent));
unset($this->_bIsLede);
} else {
array_push($this->m_aContent, trim($this->_sContent));
}
unset($this->_sContent);
break;
case 'MEDIA':
array_push($this->m_aMedia, $this->_kMedia);
unset($this->_kMedia);
break;
}
array_pop($this->m_aParentTags);
}
/**
* Handles CDATA sections from the XML document during processing
*
* @param object
* The XML parser instance inherited from the XML_Parser class
*
* @param string
* The data chunk to be processed from the parser
*
* @access private
*/
function cdataHandler( $oParser, $sData )
{
if (!in_array('MEDIA-OBJECT', $this->m_aParentTags)) {
$sData = preg_replace('#\s+#', ' ', $sData);
}
// Elements that can be found in the BODY.HEAD section of the NITF
// document are defined in this handler.
if (in_array('BODY.HEAD', $this->m_aParentTags)) {
// We don't care if they use other attribute items, we just want the
// textual version of the byline. Other attributes are appended to
// the byline data.
if (in_array('BYLINE', $this->m_aParentTags)) {
if (in_array('BYTTL', $this->m_aParentTags)) {
$this->m_kByline['title'] .= $sData;
return;
}
$this->m_kByline['author'] .= $sData;
return;
}
// Generally, the distributor is the same as the company supplying
// the content. However, this is not always the case (the AP, for
// example).
if (in_array('DISTRIBUTOR', $this->m_aParentTags)) {
$this->m_sDistributor .= $sData;
return;
}
// The location where the story pertains too.
if (in_array('DATELINE', $this->m_aParentTags)) {
if (in_array('LOCATION', $this->m_aParentTags)) {
$this->m_sLocation .= $sData;
}
return;
}
// There are only two possibilities for hedlines, the main headline
// or a subheadline.
if (in_array('HEDLINE', $this->m_aParentTags)) {
if (in_array('HL2', $this->m_aParentTags)) {
$this->_sHedline .= $sData;
} else {
$this->m_kHedlines['HL1'] .= $sData;
}
}
return;
}
// The article content, including the lead and following paragraphs, can
// be found in this section of the XML document.
if (in_array('BODY.CONTENT', $this->m_aParentTags)) {
if (in_array('MEDIA', $this->m_aParentTags)) {
// The media caption for the currently selected media element.
if (in_array('MEDIA-CAPTION', $this->m_aParentTags)) {
$this->_kMedia['caption'] .= $sData;
return;
}
if (in_array('MEDIA-OBJECT', $this->m_aParentTags)) {
$this->_kMedia['data'] .= $sData;
return;
}
}
// A paragraph element was found.
if (in_array('P', $this->m_aParentTags)) {
$this->_sContent .= $sData;
return;
}
}
// The <body.end> tag has two primary elements, <taglines> and the free
// form <bibliography> tags.
if (in_array('BODY.END', $this->m_aParentTags)) {
if (in_array('TAGLINE', $this->m_aParentTags)) {
$this->m_sTagline .= $sData;
return;
}
if (in_array('BIBLIOGRAPHY', $this->m_aParentTags)) {
$this->m_sBibliography .= $sData;
}
}
}
}
?>