Hi Again!
When users are putting often the same long markup sequences, it may
be useful to define "aliases".
Attached modifications allows to:
1) define aliases in jspwiki.properties. For instance:
#Applications shortcuts
alias.citedby=[{ReferringPagesPlugin title='!Cited by:%n'
exclude='Main,LeftMenu'}]
2) Call those alliases in pages: the syntax is the same than for
variable inclusion but a "$" sign is added at the end.
For instance: [{$citedby$}]
The WikiMarkup inside the alias is interpreted.
The nice thing is also that you can change the definition of an
Alias without changing the wiki pages...
Final note: \n is allowed in jspwiki.properties to indicate a end
of line (\n\n for end of paragraph)
Attached source code is for 2.6.1. VariableContent.java is in the
"parser" directory.
Have a nice day!
Christophe
/*
JSPWiki - a JSP-based WikiWiki clone.
Copyright (C) 2001 Janne Jalkanen ([EMAIL PROTECTED])
This program is free software; you can redistribute it and/or
modify
it under the terms of the GNU Lesser General Public License as
published by
the Free Software Foundation; either version 2.1 of the
License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA
*/
package com.ecyrd.jspwiki;
import java.security.Principal;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import com.ecyrd.jspwiki.filters.PageFilter;
import com.ecyrd.jspwiki.modules.InternalModule;
import com.ecyrd.jspwiki.render.RenderingManager;
import com.ecyrd.jspwiki.parser.MarkupParser;
import com.ecyrd.jspwiki.parser.WikiDocument;
/**
* Manages variables. Variables are case-insensitive. A list of all
* available variables is on a Wiki page called "WikiVariables".
*
* @author Janne Jalkanen
* @since 1.9.20.
*/
public class VariableManager
{
//private static Logger log = Logger.getLogger
( VariableManager.class );
// FIXME: These are probably obsolete.
public static final String VAR_ERROR = "error";
public static final String VAR_MSG = "msg";
/**
* Contains a list of those properties that shall never be shown.
* Put names here in lower case.
*/
static final String[] THE_BIG_NO_NO_LIST = {
"jspwiki.auth.masterpassword"
};
/**
* Creates a VariableManager object using the property list
given.
* @param props The properties.
*/
public VariableManager( Properties props )
{
}
/**
* Returns true if the link is really command to insert
* a variable.
* <P>
* Currently we just check if the link starts with "{$".
*
* @param link The link text
* @return true, if this represents a variable link.
*/
public static boolean isVariableLink( String link )
{
return link.startsWith("{$");
}
/**
* Parses the link and finds a value. This is essentially used
* once [EMAIL PROTECTED] #isVariableLink(String)} has found that the
link text
* actually contains a variable. For example, you could pass in
* "{$username}" and get back "JanneJalkanen".
*
* @param context The WikiContext
* @param link The link text containing the variable name.
* @return The variable value.
* @throws IllegalArgumentException If the format is not valid
(does not
* start with "{$", is zero length, etc.)
* @throws NoSuchVariableException If a variable is not known.
*/
public String parseAndGetValue( WikiContext context,
String link )
throws IllegalArgumentException,
IOException,
NoSuchVariableException
{
if( !link.startsWith("{$") )
throw new IllegalArgumentException( "Link does not
start with {$" );
if( !link.endsWith("}") )
throw new IllegalArgumentException( "Link does not end
with }" );
String varName = link.substring(2,link.length()-1);
return getValue( context, varName.trim() );
}
/**
* This method does in-place expansion of any variables.
However,
* the expansion is not done twice, that is, a variable
containing text $variable
* will not be expanded.
* <P>
* The variables should be in the same format ({$variablename}
as in the web
* pages.
*
* @param context The WikiContext of the current page.
* @param source The source string.
* @return The source string with variables expanded.
*/
// FIXME: somewhat slow.
public String expandVariables( WikiContext context,
String source )
{
StringBuffer result = new StringBuffer();
for( int i = 0; i < source.length(); i++ )
{
if( source.charAt(i) == '{' )
{
if( i < source.length()-2 && source.charAt(i+1) ==
'$' )
{
int end = source.indexOf( '}', i );
if( end != -1 )
{
String varname = source.substring( i+2, end );
String value;
try
{
value = getValue( context, varname );
}
catch( IOException e )
{
value = e.getMessage();
}
catch( NoSuchVariableException e )
{
value = e.getMessage();
}
catch( IllegalArgumentException e )
{
value = e.getMessage();
}
result.append( value );
i = end;
continue;
}
}
else
{
result.append( '{' );
}
}
else
{
result.append( source.charAt(i) );
}
}
return result.toString();
}
// Probably this should be a method of WikiContext...
private String makeHTML (WikiContext context, String wikitext)
throws IOException
{
String result = "";
RenderingManager mgr = context.getEngine
().getRenderingManager();
MarkupParser parser = mgr.getParser(context, wikitext);
WikiDocument doc = parser.parse();
result = mgr.getHTML( context, doc );
return result;
}
/**
* Returns the value of a named variable. See [EMAIL PROTECTED] #getValue
(WikiContext, String)}.
* The only difference is that this method does not throw an
exception, but it
* returns the given default value instead.
*
* @param context WikiContext
* @param varName The name of the variable
* @param defValue A default value.
* @return The variable value, or if not found, the default
value.
*/
public String getValue( WikiContext context, String varName,
String defValue )
{
try
{
return getValue( context, varName );
}
catch( NoSuchVariableException e )
{
return defValue;
}
catch( IOException e )
{
return defValue;
}
}
/**
* Returns a value of the named variable. The resolving order is
* <ol>
* <li>Known "constant" name, such as "pagename", etc. This
is so
* that pages could not override certain constants.
* <li>WikiContext local variable. This allows a programmer to
* set a parameter which cannot be overridden by user.
* <li>HTTP Session
* <li>HTTP Request parameters
* <li>WikiPage variable. As set by the user with the SET
directive.
* <li>jspwiki.properties
* </ol>
*
* Use this method only whenever you really need to have a
parameter that
* can be overridden by anyone using the wiki.
*
* @param context The WikiContext
* @param varName Name of the variable.
*
* @return The variable value.
*
* @throws IllegalArgumentException If the name is somehow
broken.
* @throws NoSuchVariableException If a variable is not known.
*/
// FIXME: Currently a bit complicated. Perhaps should use
reflection
// or something to make an easy way of doing stuff.
public String getValue( WikiContext context,
String varName )
throws IllegalArgumentException,
IOException,
NoSuchVariableException
{
if( varName == null )
throw new IllegalArgumentException( "Null variable
name." );
if( varName.length() == 0 )
throw new IllegalArgumentException( "Zero length
variable name." );
// Faster than doing equalsIgnoreCase()
String name = varName.toLowerCase();
for( int i = 0; i < THE_BIG_NO_NO_LIST.length; i++ )
{
if( name.equals(THE_BIG_NO_NO_LIST[i]) )
return ""; // FIXME: Should this be something
different?
}
if( name.equals("pagename") )
{
return context.getPage().getName();
}
else if( name.equals("applicationname") )
{
return context.getEngine().getApplicationName();
}
else if( name.equals("jspwikiversion") )
{
return Release.getVersionString();
}
else if( name.equals("encoding") )
{
return context.getEngine().getContentEncoding();
}
else if( name.equals("totalpages") )
{
return Integer.toString(context.getEngine().getPageCount
());
}
else if( name.equals("pageprovider") )
{
return context.getEngine().getCurrentProvider();
}
else if( name.equals("pageproviderdescription") )
{
return context.getEngine().getCurrentProviderInfo();
}
else if( name.equals("attachmentprovider") )
{
WikiProvider p = context.getEngine
().getAttachmentManager().getCurrentProvider();
return (p != null) ? p.getClass().getName() : "-";
}
else if( name.equals("attachmentproviderdescription") )
{
WikiProvider p = context.getEngine
().getAttachmentManager().getCurrentProvider();
return (p != null) ? p.getProviderInfo() : "-";
}
else if( name.equals("interwikilinks") )
{
StringBuffer res = new StringBuffer();
for( Iterator i = context.getEngine
().getAllInterWikiLinks().iterator(); i.hasNext(); )
{
if( res.length() > 0 ) res.append(", ");
String link = (String) i.next();
res.append( link );
res.append( " --> " );
res.append( context.getEngine().getInterWikiURL
(link) );
}
return res.toString();
}
else if( name.equals("inlinedimages") )
{
StringBuffer res = new StringBuffer();
for( Iterator i = context.getEngine
().getAllInlinedImagePatterns().iterator(); i.hasNext(); )
{
if( res.length() > 0 ) res.append(", ");
String ptrn = (String) i.next();
res.append(ptrn);
}
return res.toString();
}
else if( name.equals("pluginpath") )
{
String s = context.getEngine().getPluginSearchPath();
return (s == null) ? "-" : s;
}
else if( name.equals("baseurl") )
{
return context.getEngine().getBaseURL();
}
else if( name.equals("uptime") )
{
Date now = new Date();
long secondsRunning = (now.getTime() - context.getEngine
().getStartTime().getTime())/1000L;
long seconds = secondsRunning % 60;
long minutes = (secondsRunning /= 60) % 60;
long hours = (secondsRunning /= 60) % 24;
long days = secondsRunning /= 24;
return days+"d, "+hours+"h "+minutes+"m "+seconds+"s";
}
else if( name.equals("loginstatus") )
{
WikiSession session = context.getWikiSession();
return session.getStatus();
}
else if( name.equals("username") )
{
Principal wup = context.getCurrentUser();
return wup != null ? wup.getName() : "not logged in";
}
else if( name.equals("requestcontext") )
{
return context.getRequestContext();
}
else if( name.equals("pagefilters") )
{
List filters = context.getEngine().getFilterManager
().getFilterList();
StringBuffer sb = new StringBuffer();
for( Iterator i = filters.iterator(); i.hasNext(); )
{
PageFilter pf = (PageFilter)i.next();
String f = pf.getClass().getName();
if( pf instanceof InternalModule )
continue;
if( sb.length() > 0 ) sb.append(", ");
sb.append( f );
}
return sb.toString();
}
else
{
//
// Check if such a context variable exists,
// returning its string representation.
//
if( (context.getVariable( varName )) != null )
{
return context.getVariable( varName ).toString();
}
//
// Well, I guess it wasn't a final straw. We also allow
// variables from the session and the request (in this
order).
//
HttpServletRequest req = context.getHttpRequest();
if( req != null && req.getSession() != null )
{
HttpSession session = req.getSession();
try
{
String s;
if( (s = (String)session.getAttribute
( varName )) != null )
return s;
if( (s = context.getHttpParameter( varName )) !
= null )
return s;
}
catch( ClassCastException e ) {}
}
// And the final straw: see if the current page has
named metadata.
WikiPage pg = context.getPage();
if( pg != null )
{
Object metadata = pg.getAttribute( varName );
if( metadata != null )
return metadata.toString();
}
// And the final straw part 2: see if the "real"
current page has
// named metadata. This allows a parent page to control
a inserted
// page through defining variables
WikiPage rpg = context.getRealPage();
if( rpg != null )
{
Object metadata = rpg.getAttribute( varName );
if( metadata != null )
return metadata.toString();
}
// Next-to-final straw: attempt to fetch using property
name
// We don't allow fetching any other properties than
those starting
// with "jspwiki.". I know my own code, but I can't
vouch for bugs
// in other people's code... :-)
Properties props = context.getEngine().getWikiProperties
();
if( varName.startsWith("jspwiki.") )
{
String s = props.getProperty( varName );
if( s != null )
{
return s;
}
}
// Our local preference: be able to define Aliases in
properties to simplify long and repeated plugins!
else if ((varName.length() > 1) && (varName.charAt
(varName.length()-1) == '$')) {
String s = props.getProperty
( "alias."+varName.substring( 0, varName.length()-1 ));
if( s != null )
{
return makeHTML( context, s );
}
throw new NoSuchVariableException( "No alias
"+varName.substring( 0, varName.length()-1 )+" defined in JSPWiki
properties." );
}
//
// Final defaults for some known quantities.
//
if( varName.equals( VAR_ERROR ) || varName.equals
( VAR_MSG ) )
return "";
throw new NoSuchVariableException( "No variable
"+varName+" defined." );
}
}
}
