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Jade is a high performance template engine heavily influenced by Haml. The rjade package interfaces to the JavaScript library using V8, the embedded JavaScript engine for R. Below an example of a Jade template, taken from the jade homepage. This example template includes one variable called youAreUsingJade.
doctype html
html(lang="en")
head
title= pageTitle
script(type='text/javascript').
if (foo) {
bar(1 + 5)
}
body
h1 Jade - node template engine
#container.col
if youAreUsingJade
p You are amazing
else
p Get on it!
p.
Jade is a terse and simple
templating language with a
strong focus on performance
and powerful features.Converting a template to HTML text involves two steps. The first step compiles the template with some formatting options into a closure. The binding for this is implemented in jade_compile.
# Compile a Jade template in R
text <- readLines(system.file("examples/test.jade", package = "rjade"))
tpl <- jade_compile(text, pretty = TRUE)The second step calls the closure with optionally some local variables to render the output to HTML.
# Render the template
tpl()<!DOCTYPE html>
<html lang="en">
<head>
<title></title>
<script type="text/javascript">
if (foo) {
bar(1 + 5)
}
</script>
</head>
<body>
<h1>Jade - node template engine</h1>
<div id="container" class="col">
<p>Get on it!</p>
<p>
Jade is a terse and simple
templating language with a
strong focus on performance
and powerful features.
</p>
</div>
</body>
</html> Note how the HTML output changes when setting local variables:
tpl(youAreUsingJade = TRUE)<!DOCTYPE html>
<html lang="en">
<head>
<title></title>
<script type="text/javascript">
if (foo) {
bar(1 + 5)
}
</script>
</head>
<body>
<h1>Jade - node template engine</h1>
<div id="container" class="col">
<p>You are amazing</p>
<p>
Jade is a terse and simple
templating language with a
strong focus on performance
and powerful features.
</p>
</div>
</body>
</html> These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
Health stats visible at Monitor.