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Package `TWiki`

TWiki operates by creating a singleton object (known as the Session object) that acts as a point of reference for all the different modules in the system. This package is the class for this singleton, and also contains the vast bulk of the basic constants and the per- site configuration mechanisms.

Global variables are avoided wherever possible to avoid problems with CGI accelerators such as mod_perl.

Package TWiki

StaticMethod getTWikiLibDir `() -> $path`

STATIC method.

Returns the full path of the directory containing TWiki.pm

ObjectMethod UTF82SiteCharSet `($utf8) -> $ascii`

Auto-detect UTF-8 vs. site charset in string, and convert UTF-8 into site charset.

ObjectMethod SiteCharSet2UTF8 `($siteCharsetText) -> $utf8`

Converts a string, assumed to be encoded in Site Charset, to UTF-8.

ObjectMethod writeCompletePage `($text,$pageType,$contentType)`

Write a complete HTML page with basic header to the browser. $text is the HTML of the page body (<html> to </html>)

This method removes noautolink and nop tags before outputting the page.

ObjectMethod writePageHeader `($query,$pageType,$contentType,$contentLength)`

All parameters are optional.

$query CGI query object | Session CGI query (there is no good reason to set this)
$pageType - May be "edit", which will cause headers to be generated that force caching for 24 hours, to prevent BackFromPreviewLosesText^? bug, which caused data loss with IE5 and IE6.
$contentType - page content type | text/html
$contentLength - content-length | no content-length will be set if this is undefined, as required by HTTP1.1

Implements the post-Dec2001 release plugin API, which requires the writeHeaderHandler in plugin to return a string of HTTP headers, CR/LF delimited. Filters any illegal headers. Plugin headers will override core settings.

ObjectMethod redirect `($url,...)`

Generate a CGI redirect to $url unless (1) $session->{cgiQuery} is undef or (2) $query->param('noredirect') is set to a true value. Thus a redirect is only generated when in a CGI context.

The ... parameters are concatenated to the message written when printing to STDOUT, and are ignored for a redirect.

Redirects the request to $url, via the CGI module object $query unless overridden by a plugin declaring a redirectCgiQueryHandler.

StaticMethod isValidWikiWord `($name) -> $boolean`

Check for a valid WikiWord or WikiName

StaticMethod isValidTopicName `($name) -> $boolean`

Check for a valid topic name

StaticMethod isValidAbbrev `($name) -> $boolean`

Check for a valid ABBREV (acronym)

StaticMethod isValidWebName `($name,$system) -> $boolean`

STATIC Check for a valid web name. If $system is true, then system web names are considered valid (names starting with _) otherwise only user web names are valid

ObjectMethod readOnlyMirrorWeb `($theWeb) -> ($mirrorSiteName,$mirrorViewURL,$mirrorLink,$mirrorNote)`

If this is a mirrored web, return information about the mirror. The info is returned in a quadruple:

site name

URL

link

note

ObjectMethod getSkin `() -> $string`

Get the currently requested skin path

ObjectMethod getScriptUrl `($web,$topic,$script,...) -> $scriptURL`

Returns the URL to a TWiki script, providing the web and topic as "path info" parameters. The result looks something like this: "http://host/twiki/bin/$script/$web/$topic".

... - an arbitrary number of name,value parameter pairs that will be url-encoded and added to the url. The special parameter name '#' is reserved for specifying an anchor. e.g. getScriptUrl('x','y','view','#'=>'XXX',a=>1,b=>2) will give .../view/x/y#XXX?a=1&b=2

Note: if the context "command_line" is set (i.e. we are not running a CGI script) then absolute URLs are always generated. Also, if the context_id "absolute_urls" is set.

The default script url is taken from {ScriptUrlPath}, unless there is an exception defined for the given script in {ScriptUrlPaths}. Both {ScriptUrlPath} and {ScriptUrlPaths} may be absolute or relative URIs. If they are absolute, then they will always generate absolute URLs. if they are relative, then they will be converted to absolute when required (e.g. when running from the command line, or when generating rss). If $script is not given, absolute URLs will always be generated.

If either the web or the topic is defined, will generate a full url (including web and topic). Otherwise will generate only up to the script name.

ObjectMethod getOopsUrl `($template,@options) -> $absoluteOopsURL`

Composes a URL for an "oops" error page. The @options consists of a list of key > value pairs. The following keys are used:

=-web - web name
-topic - topic name
-def - optional template def within the main template file
-params - a single parameter, or a reference to an array of parameters These are passed in the URL as '&param1=' etc.

Do not include the "oops" part in front of the template name.

Alternatively you can pass a reference to an OopsException^? in place of the template. All other parameters will be ignored.

The returned URL ends up looking something like this: "http://host/twiki/bin/oops/$web/$topic?template=$template&param1=$scriptParams[0]..."

ObjectMethod normalizeWebTopicName `($theWeb,$theTopic) -> ($theWeb,$theTopic)`

Normalize a Web.TopicName

Input:                      Return:
  ( 'Web',  'Topic' )         ( 'Web',  'Topic' )
  ( '',     'Topic' )         ( 'Main', 'Topic' )
  ( '',     '' )              ( 'Main', 'WebHome' )
  ( '',     'Web/Topic' )     ( 'Web',  'Topic' )
  ( '',     'Web.Topic' )     ( 'Web',  'Topic' )
  ( 'Web1', 'Web2.Topic' )    ( 'Web2', 'Topic' )
  ( 'Main', 'Web2.Topic' ) ( 'Main', 'Topic' )
  ( 'TWiki', 'Web2.Topic' ) ( 'TWiki', 'Topic' )

Note: Function renamed from getWebTopic

SMELL: WARNING: this function defaults the web and topic names. Be very careful where you use it!

ClassMethod new `($remoteUser,$query)`

Constructs a new TWiki object. Parameters are taken from the query object.

$remoteUser the logged-in user (login name)
$query the query

ObjectMethod finish

Complete processing after the client's HTTP request has been responded to. Right now this only entails one activity: calling TWiki::Client to flushing the user's session (if any) to disk.

ObjectMethod writeLog `($action,$webTopic,$extra,$user)`

$action - what happened, e.g. view, save, rename
$wbTopic - what it happened to
$extra - extra info, such as minor flag
$user - user who did the saving (user object or string user name)

Write the log for an event to the logfile

ObjectMethod writeWarning `($text)`

Prints date, time, and contents $text to $TWiki::cfg{WarningFileName}, typically 'warnings.txt'. Use for warnings and errors that may require admin intervention. Use this for defensive programming warnings (e.g. assertions).

ObjectMethod writeDebug `($text)`

Prints date, time, and contents of $text to $TWiki::cfg{DebugFileName}, typically 'debug.txt'. Use for debugging messages.

StaticMethod applyPatternToIncludedText `($text,$pattern) -> $text`

Apply a pattern on included text to extract a subset

ObjectMethod inlineAlert `($template,$def,...) -> $string`

Format an error for inline inclusion in rendered output. The message string is obtained from the template 'oops'.$template, and the DEF $def is selected. The parameters (...) are used to populate %PARAM1%..%PARAMn%

ObjectMethod expandVariablesOnTopicCreation `($text,$user) -> $text`

$text - text to expand
$user - reference to user object. This is the user expanded in e.g. %USERNAME. Optional, defaults to logged-in user.

Expand limited set of variables during topic creation. These are variables expected in templates that must be statically expanded in new content.

The expanded variables are:

`%DATE%`	Signature-format date
`%SERVERTIME%`	Server time
`%GMTIME%`	GM time
`%USERNAME%`	Base login name
`%WIKINAME%`	Wiki name
`%WIKIUSERNAME%`	Wiki name with prepended web
`%URLPARAM%`	Parameters to the current CGI query
`%NOP%`	No-op

StaticMethod entityEncode `($text) -> $encodedText`

Escape characters to HTML entities. Should handle unicode characters.

HTML4.0 spec: "Certain characters in HTML are reserved for use as markup and must be escaped to appear literally. The "<" character may be represented with an entity, <. Similarly, ">" is escaped as >, and "&" is escaped as &. If an attribute value contains a double quotation mark and is delimited by double quotation marks, then the quote should be escaped as ".

Other entities exist for special characters that cannot easily be entered with some keyboards...

This method encodes <, >, &, " and any non-printable ascii characters (except for \n and \r) using numeric entities.

StaticMethod entityDecode `($encodedText) -> $text`

Revrses the encoding from entityEncode. Does not decode named entities such as &

StaticMethod urlEncode `($string) -> encodedstring`

Encode by converting characters that are illegal in URLs to their %NN equivalents. This method is used for encoding strings that must be embedded verbatim in URLs; it cannot be applied to URLs themselves, as it escapes reserved characters such as = and ?.

RFC 1738, Dec. '94:

>
...Only alphanumerics [0-9a-zA-Z], the special
characters $-_.+!*'(), and reserved characters used for their
reserved purposes may be used unencoded within a URL.

Reserved characters are $&+,/:;=?@ - these are also encoded by this method.

SMELL: For non-ISO-8859-1 $TWiki::cfg{Site}{CharSet}, need to convert to UTF-8 before URL encoding. This encoding only supports 8-bit character codes.

StaticMethod urlDecode `($string) -> decodedstring`

Reverses the encoding done in urlEncode.

StaticMethod nativeUrlEncode `($theStr,$doExtract) -> encodedstring`

Perform URL encoding into native charset ($TWiki::cfg{Site}{CharSet}) - for use when viewing attachments via browsers that generate UTF-8 URLs, on sites running with non-UTF-8 (Native) character sets. Aim is to prevent UTF-8 URL encoding. For mainframes, we assume that UTF-8 URLs will be translated by the web server to an EBCDIC character set.

THIS METHOD SHOULD ONLY BE USED IF YOU ABSOLUTELY UNDERSTAND IT. It is most likely you were looking for urlEncode.

StaticMethod isTrue `($value,$default) -> $boolean`

Returns 1 if $value is true, and 0 otherwise. "true" means set to something with a Perl true value, with the special cases that "off", "false" and "no" (case insensitive) are forced to false. Leading and trailing spaces in $value are ignored.

If the value is undef, then $default is returned. If $default is not specified it is taken as 0.

StaticMethod spaceOutWikiWord `($word,$sep) -> $string`

Spaces out a wiki word by inserting a string (default: one space) between each word component. With parameter 'sep' any string may be used as separator between the word components; if 'sep' is undefined it defaults to a space.

ObjectMethod enterContext `($id,$val)`

Add the context id $id into the set of active contexts. The $val can be anything you like, but should always evaluate to boolean TRUE.

An example of the use of contexts is in the use of tag expansion. The commonTagsHandler in plugins is called every time tags need to be expanded, and the context of that expansion is signalled by the expanding module using a context id. So the forms module adds the context id "form" before invoking common tags expansion.

Contexts are not just useful for tag expansion; they are also relevant when rendering.

Contexts are intended for use mainly by plugins. Core modules can use $session->inContext( $id ) to determine if a context is active.

ObjectMethod leaveContext `($id)`

Remove the context id $id from the set of active contexts. (see enterContext for more information on contexts)

ObjectMethod inContext `($id)`

Return the value for the given context id (see enterContext for more information on contexts)

StaticMethod registerTagHandler `($tag,$fnref)`

STATIC Add a tag handler to the function tag handlers.

$tag name of the tag e.g. MYTAG
$fnref Function to execute. Will be passed ($session, \%params, $web, $topic )

ObjectMethod handleCommonTags `($text,$web,$topic) -> $text`

Processes %VARIABLE%, and %TOC% syntax; also includes 'commonTagsHandler' plugin hook.

Returns the text of the topic, after file inclusion, variable substitution, table-of-contents generation, and any plugin changes from commonTagsHandler.

StaticMethod spamProof `($text) -> $text`

Find and replace all explicit links (<a etc) in $text and apply anti spam measures to them. This method is designed to be called on text just about to be printed to the browser, and needs to be very fast.

Links to URLs that are escaped by $cfg{AntiSpam}{Clean} are left untouched. All other links have $cfg{AntiSpam}{Options} added.

ObjectMethod addToHEAD `($id,$html)`

Add $html to the HEAD tag of the page currently being generated.

Note that TWiki variables may be used in the HEAD. They will be expanded according to normal variable expansion rules.

The 'id' is used to ensure that multiple adds of the same block of HTML don't result in it being added many times.

StaticMethod initialize `($pathInfo,$remoteUser,$topic,$url,$query) -> ($topicName,$webName,$scriptUrlPath,$userName,$dataDir)`

Return value: ( $topicName, $webName, $TWiki::cfg{ScriptUrlPath}, $userName, $TWiki::cfg{DataDir} )

Static method to construct a new singleton session instance. It creates a new TWiki and sets the Plugins $SESSION variable to point to it, so that TWiki::Func methods will work.

This method is DEPRECATED but is maintained for script compatibility.

Note that $theUrl, if specified, must be identical to $query->url()

StaticMethod readFile `($filename) -> $text`

Returns the entire contents of the given file, which can be specified in any format acceptable to the Perl open() function. Fast, but inherently unsafe.

WARNING: Never, ever use this for accessing topics or attachments! Use the Store API for that. This is for global control files only, and should be used only if there is absolutely no alternative.

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Package TWiki

StaticMethod getTWikiLibDir () -> $path

ObjectMethod UTF82SiteCharSet ($utf8) -> $ascii

ObjectMethod SiteCharSet2UTF8 ($siteCharsetText) -> $utf8

ObjectMethod writeCompletePage ($text,$pageType,$contentType)

ObjectMethod writePageHeader ($query,$pageType,$contentType,$contentLength)

ObjectMethod redirect ($url,...)

StaticMethod isValidWikiWord ($name) -> $boolean

StaticMethod isValidTopicName ($name) -> $boolean

StaticMethod isValidAbbrev ($name) -> $boolean

StaticMethod isValidWebName ($name,$system) -> $boolean

ObjectMethod readOnlyMirrorWeb ($theWeb) -> ($mirrorSiteName,$mirrorViewURL,$mirrorLink,$mirrorNote)

ObjectMethod getSkin () -> $string

ObjectMethod getScriptUrl ($web,$topic,$script,...) -> $scriptURL

ObjectMethod getOopsUrl ($template,@options) -> $absoluteOopsURL

ObjectMethod normalizeWebTopicName ($theWeb,$theTopic) -> ($theWeb,$theTopic)

ClassMethod new ($remoteUser,$query)

ObjectMethod finish

ObjectMethod writeLog ($action,$webTopic,$extra,$user)

ObjectMethod writeWarning ($text)

ObjectMethod writeDebug ($text)

StaticMethod applyPatternToIncludedText ($text,$pattern) -> $text

ObjectMethod inlineAlert ($template,$def,...) -> $string

ObjectMethod expandVariablesOnTopicCreation ($text,$user) -> $text

StaticMethod entityEncode ($text) -> $encodedText

StaticMethod entityDecode ($encodedText) -> $text

StaticMethod urlEncode ($string) -> encodedstring

StaticMethod urlDecode ($string) -> decodedstring

StaticMethod nativeUrlEncode ($theStr,$doExtract) -> encodedstring

StaticMethod isTrue ($value,$default) -> $boolean

StaticMethod spaceOutWikiWord ($word,$sep) -> $string

ObjectMethod enterContext ($id,$val)

ObjectMethod leaveContext ($id)

ObjectMethod inContext ($id)

StaticMethod registerTagHandler ($tag,$fnref)

ObjectMethod handleCommonTags ($text,$web,$topic) -> $text

StaticMethod spamProof ($text) -> $text

ObjectMethod addToHEAD ($id,$html)

StaticMethod initialize ($pathInfo,$remoteUser,$topic,$url,$query) -> ($topicName,$webName,$scriptUrlPath,$userName,$dataDir)

StaticMethod readFile ($filename) -> $text