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<?xml version="1.0" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<link rel="stylesheet" href="rivescript.css" type="text/css" />
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<link rev="made" href="mailto:root@localhost" />
</head>
<body>
<ul id="index">
<li><a href="#NAME">NAME</a></li>
<li><a href="#DESCRIPTION">DESCRIPTION</a></li>
<li><a href="#JAVASCRIPT-HANDLER">JAVASCRIPT HANDLER</a></li>
<li><a href="#SEE-ALSO">SEE ALSO</a></li>
<li><a href="#AUTHOR">AUTHOR</a></li>
</ul>
<h1 id="NAME">NAME</h1>
<p>RiveScript::Docs::JavaScript</p>
<h1 id="DESCRIPTION">DESCRIPTION</h1>
<p>To clean up the primary manpage for <a>RiveScript</a>, the JavaScript example was moved here.</p>
<p>With <code>$rs->setHandler()</code>, you can specify your own custom code to handle RiveScript object macros using programming languages other than Perl.</p>
<p>For example, if you're implementing a RiveScript bot that runs on the web, you might like to support JavaScript objects in your code, because your user's browser would be able to execute it.</p>
<h1 id="JAVASCRIPT-HANDLER">JAVASCRIPT HANDLER</h1>
<p>Here's an example of defining a handler for JavaScript objects:</p>
<pre><code> my $scripts = {}; # Place to store JS code.
$rs->setHandler (javascript => sub {
my ($self,$action,$name,$data) = @_;
# Loading the object.
if ($action eq "load") {
# Just store the code.
$scripts->{$name} = $data;
}
else {
# Turn the args into a JavaScript array.
my $code = "var fields = new Array();\n";
for (my $i = 0; $i < scalar @{$data}; $i++) {
$code .= "fields[$i] = \"$data->[$i]\";\n";
}
# Come up with code for the web browser.
$code .= "function rsobject (args) {\n"
. "$scripts->{$name}\n"
. "}"
. "document.writeln( rsobject(fields) );\n";
return "<script type=\"text/javascript\">\n"
. $code
. "</script>";
}
});</code></pre>
<p>So, the above example just loads the JavaScript source code into a hash reference named $scripts, and then when called it creates some JavaScript code to put the call's arguments into an array, creates a function that accepts the args, then calls this function in a <code>document.writeln</code>. Here's an example of how this would be used in the RiveScript code:</p>
<pre><code> // Define an object to encode text into rot13 to be executed by the web browser
> object rot13 javascript
var txt = args.join(" "); // Turn the args array into a string
var result = "";
for (var i = 0; i < txt.length; i++) {
var b = txt.charCodeAt(i);
// 65 = A 97 = a
// 77 = M 109 = m
// 78 = N 110 = n
// 90 = Z 122 = z
var isLetter = 0;
if (b >= 65 && b <= 77) {
isLetter = 1;
b += 13;
}
else if (b >= 97 && b <= 109) {
isLetter = 1;
b += 13;
}
else if (b >= 78 && b <= 90) {
isLetter = 1;
b -= 13;
}
else if (b >= 110 && b <= 122) {
isLetter = 1;
b -= 13;
}
if (isLetter) {
result += String.fromCharCode(b);
}
else {
result += String.fromCharCode(b);
}
}
return result;
< object
// Use the object
+ say * in rot13
- "<star>" in rot13 is: <call>rot13 <star></call>.</code></pre>
<p>Now, when the user at the web browser provokes this reply, it will get back a bunch of JavaScript code as part of the response. It might be like this:</p>
<pre><code> <b>User:</b> say hello world in rot13<br>
<b>Bot:</b> "hello world" in rot13 is: <script type="text/javascript">
var fields = new Array();
fields[0] = "hello";
fields[1] = "world";
function rsobject (args) {
var txt = args.join(" "); // Turn the args array into a string
var result = "";
for (var i = 0; i < txt.length; i++) {
var b = txt.charCodeAt(i);
// 65 = A 97 = a
// 77 = M 109 = m
// 78 = N 110 = n
// 90 = Z 122 = z
var isLetter = 0;
if (b >= 65 && b <= 77) {
isLetter = 1;
b += 13;
}
else if (b >= 97 && b <= 109) {
isLetter = 1;
b += 13;
}
else if (b >= 78 && b <= 90) {
isLetter = 1;
b -= 13;
}
else if (b >= 110 && b <= 122) {
isLetter = 1;
b -= 13;
}
if (isLetter) {
result += String.fromCharCode(b);
}
else {
result += String.fromCharCode(b);
}
}
return result;
}
document.writeln(rsobject(fields));
</script>.</code></pre>
<p>And so, the JavaScript gets executed inside the bot's response by the web browser.</p>
<p>In this case, Perl itself can't handle JavaScript code, but considering the environment the bot is running in (CGI served to a web browser), the web browser is capable of executing JavaScript. So, we set up a custom object handler so that JavaScript objects are given directly to the browser to be executed there.</p>
<h1 id="SEE-ALSO">SEE ALSO</h1>
<p><a>RiveScript</a>.</p>
<h1 id="AUTHOR">AUTHOR</h1>
<p>Noah Petherbridge</p>
</body>
</html>
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