By just learning Caravan one can
write very powerful and high performance applications, in a
short period.
Caravan Scripting language – Hello World example.
<html>
<head>
</head>
<body>
<table>
<tr>
<td>
Displaying Hello World text using Caravan Scripting
Language:
<caravan>
“Hello World”
</caravan>
</td>
</tr>
</table>
</body>
</html>File and Folder
access
Caravan interfaces to the underlying file system using folder and file objects. This makes it possible to access the native file system in a platform independent manner.
Event handling, queues and scheduling of tasks
Messaging and communication require mechanisms for queuing and event handling. Messages can be queued fifo based, priority based, time based or a combination of these, and event handlers can be written to handle these queues in concurrently running threads with low cpu usage and instantaneous response to critical events.
Tasks can also be scheduled in the most flexible manner using schedulers. The user can define single or multiple schedulers, running concurrently.
The user can define its own Event Handler and queues. You can multiple event handlers and queues, running simultaneously.
Invoking executable files (exe)
Caravan can take help of existing utilities for processing information and performing complex tasks. So application builder can integrate existing expertise to caravan's in-built capabilities.
XML Parser
Caravan uses XML to describe its database tables and has a built-in parser to handle XML documents. XML documents are respresented as objects which can be accessed from caravan language.
Text Parser / String Comparison
Caravan gives excellent feature to do string compare or parse text.
Persistent Object
A variable can be made available to multiple html pages, by making it persistent. It is similar to the concept of ‘session’ variables.
Http request form
When a request is posted to the server an object with name "form" is added to the object list of caravan.
The domain and user concept
In caravan the users are grouped into various domains. Each user has a domain property which can have multiple values. CARAVAN platform includes built-in Web security. Each HTML page can be protected You can restrict access to the caravan generated pages by using the domain statement:
domain <domainname>|<domainname>|....|<domainname>
example
:
domain admin;// access to only admin
users.
caravan automatically prompts for login , if the
users does not have one of the domain
names.
Conditional Statements
If..Else
and Loop…Repeat statements
Encryption of Source Code
The application code written in Caravan language
can be encrypted, protecting the system and code from
unauthorized modifications and
usage.
Redirecting Caravan output
Caravan script is used to output dynamic data to
the browser. This is done by invoking the object property that
has to be displayed. The syntax of this
is:
<caravan>
"This is dynamic data
:";objectname(propertyname);"<br>" // emits the value to
output stream
</caravan>
As you can see
constant strings are also output in the above code.
This
gives great flexibilty in formating the
output.
Many other types of output like Output to
the console, output to a variable, output to a file, close
outout etc.
Time variable
Define a time variable e.g Time
now. Can access year, month, date, hour, minute and
secs.
Many more functionality and syntax like:
Redirection of page, Label and Goto statements,
Process Termination - Over statement, modes (modes.txt),
decimal numbers (real.txt), include, sleep, exception, special
files, arithmetic, request environment, form (get, put or
post) methods, filters, break, etc
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