In jeroenooms/rjade: A Clean, Whitespace-Sensitive Template Language for Writing HTML

knitr::opts_chunk$set(comment = "")
library(rjade)

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()

Note how the HTML output changes when setting local variables:

tpl(youAreUsingJade = TRUE)

jeroenooms/rjade documentation built on Aug. 23, 2022, 7:56 p.m.