Added simpletest and start of unit tests.

git-svn-id: http://code.elgg.org/elgg/trunk@3503 36083f99-b078-4883-b0ff-0f9b5a30f544

1 files changed, 764 insertions, 0 deletions

diff --git a/vendors/simpletest/parser.php b/vendors/simpletest/parser.php
new file mode 100755
index 000000000..3f3b37b83
--- /dev/null
+++ b/vendors/simpletest/parser.php
@@ -0,0 +1,764 @@
+<?php
+/**
+ *  base include file for SimpleTest
+ *  @package    SimpleTest
+ *  @subpackage MockObjects
+ *  @version    $Id: parser.php 1723 2008-04-08 00:34:10Z lastcraft $
+ */
+
+/**#@+
+ * Lexer mode stack constants
+ */
+foreach (array('LEXER_ENTER', 'LEXER_MATCHED',
+                'LEXER_UNMATCHED', 'LEXER_EXIT',
+                'LEXER_SPECIAL') as $i => $constant) {
+    if (! defined($constant)) {
+        define($constant, $i + 1);
+    }
+}
+/**#@-*/
+
+/**
+ *    Compounded regular expression. Any of
+ *    the contained patterns could match and
+ *    when one does, it's label is returned.
+ *    @package SimpleTest
+ *    @subpackage WebTester
+ */
+class ParallelRegex {
+    var $_patterns;
+    var $_labels;
+    var $_regex;
+    var $_case;
+    
+    /**
+     *    Constructor. Starts with no patterns.
+     *    @param boolean $case    True for case sensitive, false
+     *                            for insensitive.
+     *    @access public
+     */
+    function ParallelRegex($case) {
+        $this->_case = $case;
+        $this->_patterns = array();
+        $this->_labels = array();
+        $this->_regex = null;
+    }
+    
+    /**
+     *    Adds a pattern with an optional label.
+     *    @param string $pattern      Perl style regex, but ( and )
+     *                                lose the usual meaning.
+     *    @param string $label        Label of regex to be returned
+     *                                on a match.
+     *    @access public
+     */
+    function addPattern($pattern, $label = true) {
+        $count = count($this->_patterns);
+        $this->_patterns[$count] = $pattern;
+        $this->_labels[$count] = $label;
+        $this->_regex = null;
+    }
+    
+    /**
+     *    Attempts to match all patterns at once against
+     *    a string.
+     *    @param string $subject      String to match against.
+     *    @param string $match        First matched portion of
+     *                                subject.
+     *    @return boolean             True on success.
+     *    @access public
+     */
+    function match($subject, &$match) {
+        if (count($this->_patterns) == 0) {
+            return false;
+        }
+        if (! preg_match($this->_getCompoundedRegex(), $subject, $matches)) {
+            $match = '';
+            return false;
+        }
+        $match = $matches[0];
+        for ($i = 1; $i < count($matches); $i++) {
+            if ($matches[$i]) {
+                return $this->_labels[$i - 1];
+            }
+        }
+        return true;
+    }
+    
+    /**
+     *    Compounds the patterns into a single
+     *    regular expression separated with the
+     *    "or" operator. Caches the regex.
+     *    Will automatically escape (, ) and / tokens.
+     *    @param array $patterns    List of patterns in order.
+     *    @access private
+     */
+    function _getCompoundedRegex() {
+        if ($this->_regex == null) {
+            for ($i = 0, $count = count($this->_patterns); $i < $count; $i++) {
+                $this->_patterns[$i] = '(' . str_replace(
+                        array('/', '(', ')'),
+                        array('\/', '\(', '\)'),
+                        $this->_patterns[$i]) . ')';
+            }
+            $this->_regex = "/" . implode("|", $this->_patterns) . "/" . $this->_getPerlMatchingFlags();
+        }
+        return $this->_regex;
+    }
+    
+    /**
+     *    Accessor for perl regex mode flags to use.
+     *    @return string       Perl regex flags.
+     *    @access private
+     */
+    function _getPerlMatchingFlags() {
+        return ($this->_case ? "msS" : "msSi");
+    }
+}
+
+/**
+ *    States for a stack machine.
+ *    @package SimpleTest
+ *    @subpackage WebTester
+ */
+class SimpleStateStack {
+    var $_stack;
+    
+    /**
+     *    Constructor. Starts in named state.
+     *    @param string $start        Starting state name.
+     *    @access public
+     */
+    function SimpleStateStack($start) {
+        $this->_stack = array($start);
+    }
+    
+    /**
+     *    Accessor for current state.
+     *    @return string       State.
+     *    @access public
+     */
+    function getCurrent() {
+        return $this->_stack[count($this->_stack) - 1];
+    }
+    
+    /**
+     *    Adds a state to the stack and sets it
+     *    to be the current state.
+     *    @param string $state        New state.
+     *    @access public
+     */
+    function enter($state) {
+        array_push($this->_stack, $state);
+    }
+    
+    /**
+     *    Leaves the current state and reverts
+     *    to the previous one.
+     *    @return boolean    False if we drop off
+     *                       the bottom of the list.
+     *    @access public
+     */
+    function leave() {
+        if (count($this->_stack) == 1) {
+            return false;
+        }
+        array_pop($this->_stack);
+        return true;
+    }
+}
+
+/**
+ *    Accepts text and breaks it into tokens.
+ *    Some optimisation to make the sure the
+ *    content is only scanned by the PHP regex
+ *    parser once. Lexer modes must not start
+ *    with leading underscores.
+ *    @package SimpleTest
+ *    @subpackage WebTester
+ */
+class SimpleLexer {
+    var $_regexes;
+    var $_parser;
+    var $_mode;
+    var $_mode_handlers;
+    var $_case;
+    
+    /**
+     *    Sets up the lexer in case insensitive matching
+     *    by default.
+     *    @param SimpleSaxParser $parser  Handling strategy by
+     *                                    reference.
+     *    @param string $start            Starting handler.
+     *    @param boolean $case            True for case sensitive.
+     *    @access public
+     */
+    function SimpleLexer(&$parser, $start = "accept", $case = false) {
+        $this->_case = $case;
+        $this->_regexes = array();
+        $this->_parser = &$parser;
+        $this->_mode = &new SimpleStateStack($start);
+        $this->_mode_handlers = array($start => $start);
+    }
+    
+    /**
+     *    Adds a token search pattern for a particular
+     *    parsing mode. The pattern does not change the
+     *    current mode.
+     *    @param string $pattern      Perl style regex, but ( and )
+     *                                lose the usual meaning.
+     *    @param string $mode         Should only apply this
+     *                                pattern when dealing with
+     *                                this type of input.
+     *    @access public
+     */
+    function addPattern($pattern, $mode = "accept") {
+        if (! isset($this->_regexes[$mode])) {
+            $this->_regexes[$mode] = new ParallelRegex($this->_case);
+        }
+        $this->_regexes[$mode]->addPattern($pattern);
+        if (! isset($this->_mode_handlers[$mode])) {
+            $this->_mode_handlers[$mode] = $mode;
+        }
+    }
+    
+    /**
+     *    Adds a pattern that will enter a new parsing
+     *    mode. Useful for entering parenthesis, strings,
+     *    tags, etc.
+     *    @param string $pattern      Perl style regex, but ( and )
+     *                                lose the usual meaning.
+     *    @param string $mode         Should only apply this
+     *                                pattern when dealing with
+     *                                this type of input.
+     *    @param string $new_mode     Change parsing to this new
+     *                                nested mode.
+     *    @access public
+     */
+    function addEntryPattern($pattern, $mode, $new_mode) {
+        if (! isset($this->_regexes[$mode])) {
+            $this->_regexes[$mode] = new ParallelRegex($this->_case);
+        }
+        $this->_regexes[$mode]->addPattern($pattern, $new_mode);
+        if (! isset($this->_mode_handlers[$new_mode])) {
+            $this->_mode_handlers[$new_mode] = $new_mode;
+        }
+    }
+    
+    /**
+     *    Adds a pattern that will exit the current mode
+     *    and re-enter the previous one.
+     *    @param string $pattern      Perl style regex, but ( and )
+     *                                lose the usual meaning.
+     *    @param string $mode         Mode to leave.
+     *    @access public
+     */
+    function addExitPattern($pattern, $mode) {
+        if (! isset($this->_regexes[$mode])) {
+            $this->_regexes[$mode] = new ParallelRegex($this->_case);
+        }
+        $this->_regexes[$mode]->addPattern($pattern, "__exit");
+        if (! isset($this->_mode_handlers[$mode])) {
+            $this->_mode_handlers[$mode] = $mode;
+        }
+    }
+    
+    /**
+     *    Adds a pattern that has a special mode. Acts as an entry
+     *    and exit pattern in one go, effectively calling a special
+     *    parser handler for this token only.
+     *    @param string $pattern      Perl style regex, but ( and )
+     *                                lose the usual meaning.
+     *    @param string $mode         Should only apply this
+     *                                pattern when dealing with
+     *                                this type of input.
+     *    @param string $special      Use this mode for this one token.
+     *    @access public
+     */
+    function addSpecialPattern($pattern, $mode, $special) {
+        if (! isset($this->_regexes[$mode])) {
+            $this->_regexes[$mode] = new ParallelRegex($this->_case);
+        }
+        $this->_regexes[$mode]->addPattern($pattern, "_$special");
+        if (! isset($this->_mode_handlers[$special])) {
+            $this->_mode_handlers[$special] = $special;
+        }
+    }
+    
+    /**
+     *    Adds a mapping from a mode to another handler.
+     *    @param string $mode        Mode to be remapped.
+     *    @param string $handler     New target handler.
+     *    @access public
+     */
+    function mapHandler($mode, $handler) {
+        $this->_mode_handlers[$mode] = $handler;
+    }
+    
+    /**
+     *    Splits the page text into tokens. Will fail
+     *    if the handlers report an error or if no
+     *    content is consumed. If successful then each
+     *    unparsed and parsed token invokes a call to the
+     *    held listener.
+     *    @param string $raw        Raw HTML text.
+     *    @return boolean           True on success, else false.
+     *    @access public
+     */
+    function parse($raw) {
+        if (! isset($this->_parser)) {
+            return false;
+        }
+        $length = strlen($raw);
+        while (is_array($parsed = $this->_reduce($raw))) {
+            list($raw, $unmatched, $matched, $mode) = $parsed;
+            if (! $this->_dispatchTokens($unmatched, $matched, $mode)) {
+                return false;
+            }
+            if ($raw === '') {
+                return true;
+            }
+            if (strlen($raw) == $length) {
+                return false;
+            }
+            $length = strlen($raw);
+        }
+        if (! $parsed) {
+            return false;
+        }
+        return $this->_invokeParser($raw, LEXER_UNMATCHED);
+    }
+    
+    /**
+     *    Sends the matched token and any leading unmatched
+     *    text to the parser changing the lexer to a new
+     *    mode if one is listed.
+     *    @param string $unmatched    Unmatched leading portion.
+     *    @param string $matched      Actual token match.
+     *    @param string $mode         Mode after match. A boolean
+     *                                false mode causes no change.
+     *    @return boolean             False if there was any error
+     *                                from the parser.
+     *    @access private
+     */
+    function _dispatchTokens($unmatched, $matched, $mode = false) {
+        if (! $this->_invokeParser($unmatched, LEXER_UNMATCHED)) {
+            return false;
+        }
+        if (is_bool($mode)) {
+            return $this->_invokeParser($matched, LEXER_MATCHED);
+        }
+        if ($this->_isModeEnd($mode)) {
+            if (! $this->_invokeParser($matched, LEXER_EXIT)) {
+                return false;
+            }
+            return $this->_mode->leave();
+        }
+        if ($this->_isSpecialMode($mode)) {
+            $this->_mode->enter($this->_decodeSpecial($mode));
+            if (! $this->_invokeParser($matched, LEXER_SPECIAL)) {
+                return false;
+            }
+            return $this->_mode->leave();
+        }
+        $this->_mode->enter($mode);
+        return $this->_invokeParser($matched, LEXER_ENTER);
+    }
+    
+    /**
+     *    Tests to see if the new mode is actually to leave
+     *    the current mode and pop an item from the matching
+     *    mode stack.
+     *    @param string $mode    Mode to test.
+     *    @return boolean        True if this is the exit mode.
+     *    @access private
+     */
+    function _isModeEnd($mode) {
+        return ($mode === "__exit");
+    }
+    
+    /**
+     *    Test to see if the mode is one where this mode
+     *    is entered for this token only and automatically
+     *    leaves immediately afterwoods.
+     *    @param string $mode    Mode to test.
+     *    @return boolean        True if this is the exit mode.
+     *    @access private
+     */
+    function _isSpecialMode($mode) {
+        return (strncmp($mode, "_", 1) == 0);
+    }
+    
+    /**
+     *    Strips the magic underscore marking single token
+     *    modes.
+     *    @param string $mode    Mode to decode.
+     *    @return string         Underlying mode name.
+     *    @access private
+     */
+    function _decodeSpecial($mode) {
+        return substr($mode, 1);
+    }
+    
+    /**
+     *    Calls the parser method named after the current
+     *    mode. Empty content will be ignored. The lexer
+     *    has a parser handler for each mode in the lexer.
+     *    @param string $content        Text parsed.
+     *    @param boolean $is_match      Token is recognised rather
+     *                                  than unparsed data.
+     *    @access private
+     */
+    function _invokeParser($content, $is_match) {
+        if (($content === '') || ($content === false)) {
+            return true;
+        }
+        $handler = $this->_mode_handlers[$this->_mode->getCurrent()];
+        return $this->_parser->$handler($content, $is_match);
+    }
+    
+    /**
+     *    Tries to match a chunk of text and if successful
+     *    removes the recognised chunk and any leading
+     *    unparsed data. Empty strings will not be matched.
+     *    @param string $raw         The subject to parse. This is the
+     *                               content that will be eaten.
+     *    @return array/boolean      Three item list of unparsed
+     *                               content followed by the
+     *                               recognised token and finally the
+     *                               action the parser is to take.
+     *                               True if no match, false if there
+     *                               is a parsing error.
+     *    @access private
+     */
+    function _reduce($raw) {
+        if ($action = $this->_regexes[$this->_mode->getCurrent()]->match($raw, $match)) {
+            $unparsed_character_count = strpos($raw, $match);
+            $unparsed = substr($raw, 0, $unparsed_character_count);
+            $raw = substr($raw, $unparsed_character_count + strlen($match));
+            return array($raw, $unparsed, $match, $action);
+        }
+        return true;
+    }
+}
+
+/**
+ *    Breaks HTML into SAX events.
+ *    @package SimpleTest
+ *    @subpackage WebTester
+ */
+class SimpleHtmlLexer extends SimpleLexer {
+    
+    /**
+     *    Sets up the lexer with case insensitive matching
+     *    and adds the HTML handlers.
+     *    @param SimpleSaxParser $parser  Handling strategy by
+     *                                    reference.
+     *    @access public
+     */
+    function SimpleHtmlLexer(&$parser) {
+        $this->SimpleLexer($parser, 'text');
+        $this->mapHandler('text', 'acceptTextToken');
+        $this->_addSkipping();
+        foreach ($this->_getParsedTags() as $tag) {
+            $this->_addTag($tag);
+        }
+        $this->_addInTagTokens();
+    }
+    
+    /**
+     *    List of parsed tags. Others are ignored.
+     *    @return array        List of searched for tags.
+     *    @access private
+     */
+    function _getParsedTags() {
+        return array('a', 'base', 'title', 'form', 'input', 'button', 'textarea', 'select',
+                'option', 'frameset', 'frame', 'label');
+    }
+    
+    /**
+     *    The lexer has to skip certain sections such
+     *    as server code, client code and styles.
+     *    @access private
+     */
+    function _addSkipping() {
+        $this->mapHandler('css', 'ignore');
+        $this->addEntryPattern('<style', 'text', 'css');
+        $this->addExitPattern('</style>', 'css');
+        $this->mapHandler('js', 'ignore');
+        $this->addEntryPattern('<script', 'text', 'js');
+        $this->addExitPattern('</script>', 'js');
+        $this->mapHandler('comment', 'ignore');
+        $this->addEntryPattern('<!--', 'text', 'comment');
+        $this->addExitPattern('-->', 'comment');
+    }
+    
+    /**
+     *    Pattern matches to start and end a tag.
+     *    @param string $tag          Name of tag to scan for.
+     *    @access private
+     */
+    function _addTag($tag) {
+        $this->addSpecialPattern("</$tag>", 'text', 'acceptEndToken');
+        $this->addEntryPattern("<$tag", 'text', 'tag');
+    }
+    
+    /**
+     *    Pattern matches to parse the inside of a tag
+     *    including the attributes and their quoting.
+     *    @access private
+     */
+    function _addInTagTokens() {
+        $this->mapHandler('tag', 'acceptStartToken');
+        $this->addSpecialPattern('\s+', 'tag', 'ignore');
+        $this->_addAttributeTokens();
+        $this->addExitPattern('/>', 'tag');
+        $this->addExitPattern('>', 'tag');
+    }
+    
+    /**
+     *    Matches attributes that are either single quoted,
+     *    double quoted or unquoted.
+     *    @access private
+     */
+    function _addAttributeTokens() {
+        $this->mapHandler('dq_attribute', 'acceptAttributeToken');
+        $this->addEntryPattern('=\s*"', 'tag', 'dq_attribute');
+        $this->addPattern("\\\\\"", 'dq_attribute');
+        $this->addExitPattern('"', 'dq_attribute');
+        $this->mapHandler('sq_attribute', 'acceptAttributeToken');
+        $this->addEntryPattern("=\s*'", 'tag', 'sq_attribute');
+        $this->addPattern("\\\\'", 'sq_attribute');
+        $this->addExitPattern("'", 'sq_attribute');
+        $this->mapHandler('uq_attribute', 'acceptAttributeToken');
+        $this->addSpecialPattern('=\s*[^>\s]*', 'tag', 'uq_attribute');
+    }
+}
+
+/**
+ *    Converts HTML tokens into selected SAX events.
+ *    @package SimpleTest
+ *    @subpackage WebTester
+ */
+class SimpleHtmlSaxParser {
+    var $_lexer;
+    var $_listener;
+    var $_tag;
+    var $_attributes;
+    var $_current_attribute;
+    
+    /**
+     *    Sets the listener.
+     *    @param SimpleSaxListener $listener    SAX event handler.
+     *    @access public
+     */
+    function SimpleHtmlSaxParser(&$listener) {
+        $this->_listener = &$listener;
+        $this->_lexer = &$this->createLexer($this);
+        $this->_tag = '';
+        $this->_attributes = array();
+        $this->_current_attribute = '';
+    }
+    
+    /**
+     *    Runs the content through the lexer which
+     *    should call back to the acceptors.
+     *    @param string $raw      Page text to parse.
+     *    @return boolean         False if parse error.
+     *    @access public
+     */
+    function parse($raw) {
+        return $this->_lexer->parse($raw);
+    }
+    
+    /**
+     *    Sets up the matching lexer. Starts in 'text' mode.
+     *    @param SimpleSaxParser $parser    Event generator, usually $self.
+     *    @return SimpleLexer               Lexer suitable for this parser.
+     *    @access public
+     *    @static
+     */
+    function &createLexer(&$parser) {
+        $lexer = &new SimpleHtmlLexer($parser);
+        return $lexer;
+    }
+    
+    /**
+     *    Accepts a token from the tag mode. If the
+     *    starting element completes then the element
+     *    is dispatched and the current attributes
+     *    set back to empty. The element or attribute
+     *    name is converted to lower case.
+     *    @param string $token     Incoming characters.
+     *    @param integer $event    Lexer event type.
+     *    @return boolean          False if parse error.
+     *    @access public
+     */
+    function acceptStartToken($token, $event) {
+        if ($event == LEXER_ENTER) {
+            $this->_tag = strtolower(substr($token, 1));
+            return true;
+        }
+        if ($event == LEXER_EXIT) {
+            $success = $this->_listener->startElement(
+                    $this->_tag,
+                    $this->_attributes);
+            $this->_tag = '';
+            $this->_attributes = array();
+            return $success;
+        }
+        if ($token != '=') {
+            $this->_current_attribute = strtolower(SimpleHtmlSaxParser::decodeHtml($token));
+            $this->_attributes[$this->_current_attribute] = '';
+        }
+        return true;
+    }
+    
+    /**
+     *    Accepts a token from the end tag mode.
+     *    The element name is converted to lower case.
+     *    @param string $token     Incoming characters.
+     *    @param integer $event    Lexer event type.
+     *    @return boolean          False if parse error.
+     *    @access public
+     */
+    function acceptEndToken($token, $event) {
+        if (! preg_match('/<\/(.*)>/', $token, $matches)) {
+            return false;
+        }
+        return $this->_listener->endElement(strtolower($matches[1]));
+    }
+    
+    /**
+     *    Part of the tag data.
+     *    @param string $token     Incoming characters.
+     *    @param integer $event    Lexer event type.
+     *    @return boolean          False if parse error.
+     *    @access public
+     */
+    function acceptAttributeToken($token, $event) {
+        if ($this->_current_attribute) {
+            if ($event == LEXER_UNMATCHED) {
+                $this->_attributes[$this->_current_attribute] .=
+                        SimpleHtmlSaxParser::decodeHtml($token);
+            }
+            if ($event == LEXER_SPECIAL) {
+                $this->_attributes[$this->_current_attribute] .=
+                        preg_replace('/^=\s*/' , '', SimpleHtmlSaxParser::decodeHtml($token));
+            }
+        }
+        return true;
+    }
+    
+    /**
+     *    A character entity.
+     *    @param string $token    Incoming characters.
+     *    @param integer $event   Lexer event type.
+     *    @return boolean         False if parse error.
+     *    @access public
+     */
+    function acceptEntityToken($token, $event) {
+    }
+    
+    /**
+     *    Character data between tags regarded as
+     *    important.
+     *    @param string $token     Incoming characters.
+     *    @param integer $event    Lexer event type.
+     *    @return boolean          False if parse error.
+     *    @access public
+     */
+    function acceptTextToken($token, $event) {
+        return $this->_listener->addContent($token);
+    }
+    
+    /**
+     *    Incoming data to be ignored.
+     *    @param string $token     Incoming characters.
+     *    @param integer $event    Lexer event type.
+     *    @return boolean          False if parse error.
+     *    @access public
+     */
+    function ignore($token, $event) {
+        return true;
+    }
+    
+    /**
+     *    Decodes any HTML entities.
+     *    @param string $html    Incoming HTML.
+     *    @return string         Outgoing plain text.
+     *    @access public
+     *    @static
+     */
+    function decodeHtml($html) {
+        return html_entity_decode($html, ENT_QUOTES);
+    }
+    
+    /**
+     *    Turns HTML into text browser visible text. Images
+     *    are converted to their alt text and tags are supressed.
+     *    Entities are converted to their visible representation.
+     *    @param string $html        HTML to convert.
+     *    @return string             Plain text.
+     *    @access public
+     *    @static
+     */
+    function normalise($html) {
+        $text = preg_replace('|<!--.*?-->|', '', $html);
+        $text = preg_replace('|<script[^>]*>.*?</script>|', '', $text);
+        $text = preg_replace('|<img[^>]*alt\s*=\s*"([^"]*)"[^>]*>|', ' \1 ', $text);
+        $text = preg_replace('|<img[^>]*alt\s*=\s*\'([^\']*)\'[^>]*>|', ' \1 ', $text);
+        $text = preg_replace('|<img[^>]*alt\s*=\s*([a-zA-Z_]+)[^>]*>|', ' \1 ', $text);
+        $text = preg_replace('|<[^>]*>|', '', $text);
+        $text = SimpleHtmlSaxParser::decodeHtml($text);
+        $text = preg_replace('|\s+|', ' ', $text);
+        return trim(trim($text), "\xA0");        // TODO: The \xAO is a &nbsp;. Add a test for this.
+    }
+}
+
+/**
+ *    SAX event handler.
+ *    @package SimpleTest
+ *    @subpackage WebTester
+ *    @abstract
+ */
+class SimpleSaxListener {
+    
+    /**
+     *    Sets the document to write to.
+     *    @access public
+     */
+    function SimpleSaxListener() {
+    }
+    
+    /**
+     *    Start of element event.
+     *    @param string $name        Element name.
+     *    @param hash $attributes    Name value pairs.
+     *                               Attributes without content
+     *                               are marked as true.
+     *    @return boolean            False on parse error.
+     *    @access public
+     */
+    function startElement($name, $attributes) {
+    }
+    
+    /**
+     *    End of element event.
+     *    @param string $name        Element name.
+     *    @return boolean            False on parse error.
+     *    @access public
+     */
+    function endElement($name) {
+    }
+    
+    /**
+     *    Unparsed, but relevant data.
+     *    @param string $text        May include unparsed tags.
+     *    @return boolean            False on parse error.
+     *    @access public
+     */
+    function addContent($text) {
+    }
+}
+?>
\ No newline at end of file