1 <?php

     2 /**

     3  * Atom Syndication Format PHP Library

     4  *

     5  * @package AtomLib

     6  * @link http://code.google.com/p/phpatomlib/

     7  *

     8  * @author Elias Torres <elias@torrez.us>

     9  * @version 0.4

    10  * @since 2.3

    11  */

    12 

    13 /**

    14  * Structure that store common Atom Feed Properties

    15  *

    16  * @package AtomLib

    17  */

    18 class AtomFeed {

    19 	/**

    20 	 * Stores Links

    21 	 * @var array

    22 	 * @access public

    23 	 */

    24     var $links = array();

    25     /**

    26      * Stores Categories

    27      * @var array

    28      * @access public

    29      */

    30     var $categories = array();

    31 	/**

    32 	 * Stores Entries

    33 	 *

    34 	 * @var array

    35 	 * @access public

    36 	 */

    37     var $entries = array();

    38 }

    39 

    40 /**

    41  * Structure that store Atom Entry Properties

    42  *

    43  * @package AtomLib

    44  */

    45 class AtomEntry {

    46 	/**

    47 	 * Stores Links

    48 	 * @var array

    49 	 * @access public

    50 	 */

    51     var $links = array();

    52     /**

    53      * Stores Categories

    54      * @var array

    55 	 * @access public

    56      */

    57     var $categories = array();

    58 }

    59 

    60 /**

    61  * AtomLib Atom Parser API

    62  *

    63  * @package AtomLib

    64  */

    65 class AtomParser {

    66 

    67     var $NS = 'http://www.w3.org/2005/Atom';

    68     var $ATOM_CONTENT_ELEMENTS = array('content','summary','title','subtitle','rights');

    69     var $ATOM_SIMPLE_ELEMENTS = array('id','updated','published','draft');

    70 

    71     var $debug = false;

    72 

    73     var $depth = 0;

    74     var $indent = 2;

    75     var $in_content;

    76     var $ns_contexts = array();

    77     var $ns_decls = array();

    78     var $content_ns_decls = array();

    79     var $content_ns_contexts = array();

    80     var $is_xhtml = false;

    81     var $is_html = false;

    82     var $is_text = true;

    83     var $skipped_div = false;

    84 

    85     var $FILE = "php://input";

    86 

    87     var $feed;

    88     var $current;

    89 

    90     function AtomParser() {

    91 

    92         $this->feed = new AtomFeed();

    93         $this->current = null;

    94         $this->map_attrs_func = create_function('$k,$v', 'return "$k=\"$v\"";');

    95         $this->map_xmlns_func = create_function('$p,$n', '$xd = "xmlns"; if(strlen($n[0])>0) $xd .= ":{$n[0]}"; return "{$xd}=\"{$n[1]}\"";');

    96     }

    97 

    98     function _p($msg) {

    99         if($this->debug) {

   100             print str_repeat(" ", $this->depth * $this->indent) . $msg ."\n";

   101         }

   102     }

   103 

   104     function error_handler($log_level, $log_text, $error_file, $error_line) {

   105         $this->error = $log_text;

   106     }

   107 

   108     function parse() {

   109 

   110         set_error_handler(array(&$this, 'error_handler'));

   111 

   112         array_unshift($this->ns_contexts, array());

   113 

   114         $parser = xml_parser_create_ns();

   115         xml_set_object($parser, $this);

   116         xml_set_element_handler($parser, "start_element", "end_element");

   117         xml_parser_set_option($parser,XML_OPTION_CASE_FOLDING,0);

   118         xml_parser_set_option($parser,XML_OPTION_SKIP_WHITE,0);

   119         xml_set_character_data_handler($parser, "cdata");

   120         xml_set_default_handler($parser, "_default");

   121         xml_set_start_namespace_decl_handler($parser, "start_ns");

   122         xml_set_end_namespace_decl_handler($parser, "end_ns");

   123 

   124         $this->content = '';

   125 

   126         $ret = true;

   127 

   128         $fp = fopen($this->FILE, "r");

   129         while ($data = fread($fp, 4096)) {

   130             if($this->debug) $this->content .= $data;

   131 

   132             if(!xml_parse($parser, $data, feof($fp))) {

   133                 trigger_error(sprintf(__('XML error: %s at line %d')."\n",

   134                     xml_error_string(xml_get_error_code($xml_parser)),

   135                     xml_get_current_line_number($xml_parser)));

   136                 $ret = false;

   137                 break;

   138             }

   139         }

   140         fclose($fp);

   141 

   142         xml_parser_free($parser);

   143 

   144         restore_error_handler();

   145 

   146         return $ret;

   147     }

   148 

   149     function start_element($parser, $name, $attrs) {

   150 

   151         $tag = array_pop(split(":", $name));

   152 

   153         switch($name) {

   154             case $this->NS . ':feed':

   155                 $this->current = $this->feed;

   156                 break;

   157             case $this->NS . ':entry':

   158                 $this->current = new AtomEntry();

   159                 break;

   160         };

   161 

   162         $this->_p("start_element('$name')");

   163         #$this->_p(print_r($this->ns_contexts,true));

   164         #$this->_p('current(' . $this->current . ')');

   165 

   166         array_unshift($this->ns_contexts, $this->ns_decls);

   167 

   168         $this->depth++;

   169 

   170         if(!empty($this->in_content)) {

   171 

   172             $this->content_ns_decls = array();

   173 

   174             if($this->is_html || $this->is_text)

   175                 trigger_error("Invalid content in element found. Content must not be of type text or html if it contains markup.");

   176 

   177             $attrs_prefix = array();

   178 

   179             // resolve prefixes for attributes

   180             foreach($attrs as $key => $value) {

   181                 $with_prefix = $this->ns_to_prefix($key, true);

   182                 $attrs_prefix[$with_prefix[1]] = $this->xml_escape($value);

   183             }

   184 

   185             $attrs_str = join(' ', array_map($this->map_attrs_func, array_keys($attrs_prefix), array_values($attrs_prefix)));

   186             if(strlen($attrs_str) > 0) {

   187                 $attrs_str = " " . $attrs_str;

   188             }

   189 

   190             $with_prefix = $this->ns_to_prefix($name);

   191 

   192             if(!$this->is_declared_content_ns($with_prefix[0])) {

   193                 array_push($this->content_ns_decls, $with_prefix[0]);

   194             }

   195 

   196             $xmlns_str = '';

   197             if(count($this->content_ns_decls) > 0) {

   198                 array_unshift($this->content_ns_contexts, $this->content_ns_decls);

   199                 $xmlns_str .= join(' ', array_map($this->map_xmlns_func, array_keys($this->content_ns_contexts[0]), array_values($this->content_ns_contexts[0])));

   200                 if(strlen($xmlns_str) > 0) {

   201                     $xmlns_str = " " . $xmlns_str;

   202                 }

   203             }

   204 

   205             array_push($this->in_content, array($tag, $this->depth, "<". $with_prefix[1] ."{$xmlns_str}{$attrs_str}" . ">"));

   206 

   207         } else if(in_array($tag, $this->ATOM_CONTENT_ELEMENTS) || in_array($tag, $this->ATOM_SIMPLE_ELEMENTS)) {

   208             $this->in_content = array();

   209             $this->is_xhtml = $attrs['type'] == 'xhtml';

   210             $this->is_html = $attrs['type'] == 'html' || $attrs['type'] == 'text/html';

   211             $this->is_text = !in_array('type',array_keys($attrs)) || $attrs['type'] == 'text';

   212             $type = $this->is_xhtml ? 'XHTML' : ($this->is_html ? 'HTML' : ($this->is_text ? 'TEXT' : $attrs['type']));

   213 

   214             if(in_array('src',array_keys($attrs))) {

   215                 $this->current->$tag = $attrs;

   216             } else {

   217                 array_push($this->in_content, array($tag,$this->depth, $type));

   218             }

   219         } else if($tag == 'link') {

   220             array_push($this->current->links, $attrs);

   221         } else if($tag == 'category') {

   222             array_push($this->current->categories, $attrs);

   223         }

   224 

   225         $this->ns_decls = array();

   226     }

   227 

   228     function end_element($parser, $name) {

   229 

   230         $tag = array_pop(split(":", $name));

   231 

   232         $ccount = count($this->in_content);

   233 

   234         # if we are *in* content, then let's proceed to serialize it

   235         if(!empty($this->in_content)) {

   236             # if we are ending the original content element

   237             # then let's finalize the content

   238             if($this->in_content[0][0] == $tag &&

   239                 $this->in_content[0][1] == $this->depth) {

   240                 $origtype = $this->in_content[0][2];

   241                 array_shift($this->in_content);

   242                 $newcontent = array();

   243                 foreach($this->in_content as $c) {

   244                     if(count($c) == 3) {

   245                         array_push($newcontent, $c[2]);

   246                     } else {

   247                         if($this->is_xhtml || $this->is_text) {

   248                             array_push($newcontent, $this->xml_escape($c));

   249                         } else {

   250                             array_push($newcontent, $c);

   251                         }

   252                     }

   253                 }

   254                 if(in_array($tag, $this->ATOM_CONTENT_ELEMENTS)) {

   255                     $this->current->$tag = array($origtype, join('',$newcontent));

   256                 } else {

   257                     $this->current->$tag = join('',$newcontent);

   258                 }

   259                 $this->in_content = array();

   260             } else if($this->in_content[$ccount-1][0] == $tag &&

   261                 $this->in_content[$ccount-1][1] == $this->depth) {

   262                 $this->in_content[$ccount-1][2] = substr($this->in_content[$ccount-1][2],0,-1) . "/>";

   263             } else {

   264                 # else, just finalize the current element's content

   265                 $endtag = $this->ns_to_prefix($name);

   266                 array_push($this->in_content, array($tag, $this->depth, "</$endtag[1]>"));

   267             }

   268         }

   269 

   270         array_shift($this->ns_contexts);

   271 

   272         $this->depth--;

   273 

   274         if($name == ($this->NS . ':entry')) {

   275             array_push($this->feed->entries, $this->current);

   276             $this->current = null;

   277         }

   278 

   279         $this->_p("end_element('$name')");

   280     }

   281 

   282     function start_ns($parser, $prefix, $uri) {

   283         $this->_p("starting: " . $prefix . ":" . $uri);

   284         array_push($this->ns_decls, array($prefix,$uri));

   285     }

   286 

   287     function end_ns($parser, $prefix) {

   288         $this->_p("ending: #" . $prefix . "#");

   289     }

   290 

   291     function cdata($parser, $data) {

   292         $this->_p("data: #" . str_replace(array("\n"), array("\\n"), trim($data)) . "#");

   293         if(!empty($this->in_content)) {

   294             array_push($this->in_content, $data);

   295         }

   296     }

   297 

   298     function _default($parser, $data) {

   299         # when does this gets called?

   300     }

   301 

   302 

   303     function ns_to_prefix($qname, $attr=false) {

   304         # split 'http://www.w3.org/1999/xhtml:div' into ('http','//www.w3.org/1999/xhtml','div')

   305         $components = split(":", $qname);

   306 

   307         # grab the last one (e.g 'div')

   308         $name = array_pop($components);

   309 

   310         if(!empty($components)) {

   311             # re-join back the namespace component

   312             $ns = join(":",$components);

   313             foreach($this->ns_contexts as $context) {

   314                 foreach($context as $mapping) {

   315                     if($mapping[1] == $ns && strlen($mapping[0]) > 0) {

   316                         return array($mapping, "$mapping[0]:$name");

   317                     }

   318                 }

   319             }

   320         }

   321 

   322         if($attr) {

   323             return array(null, $name);

   324         } else {

   325             foreach($this->ns_contexts as $context) {

   326                 foreach($context as $mapping) {

   327                     if(strlen($mapping[0]) == 0) {

   328                         return array($mapping, $name);

   329                     }

   330                 }

   331             }

   332         }

   333     }

   334 

   335     function is_declared_content_ns($new_mapping) {

   336         foreach($this->content_ns_contexts as $context) {

   337             foreach($context as $mapping) {

   338                 if($new_mapping == $mapping) {

   339                     return true;

   340                 }

   341             }

   342         }

   343         return false;

   344     }

   345 

   346     function xml_escape($string)

   347     {

   348              return str_replace(array('&','"',"'",'<','>'),

   349                 array('&','"',''','<','>'),

   350                 $string );

   351     }

   352 }

   353 

   354 ?>