Razor Leaf is a template engine for JavaScript with a convenient indentation-based syntax. It aims to reduce the redundancy inherent in HTML with simple rules, a sparse syntax, and a few further features not found in larger libraries.
Elements are defined by their names only; no other special character is necessary.
p
<p></p>
Void elements are recognized automatically.
meta
<meta>
Strings are double-quoted and escaped for use in HTML as needed. Backslash escape codes can be used as in JavaScript. No whitespace is added around strings.
"--> A string <--\n" "A string containing \"double-quotes\""
--> A string <--
A string containing "double-quotes"
Strings can also contain interpolated sections, delimited by #{ and }.
#{ can be escaped with a leading backslash; } doesn’t require escaping.
"#{6 * 7}"
42
If an exclamation mark precedes the string, it and any of its interpolated sections will not be escaped.
!"<!-- A significant comment -->"
<!-- A significant comment -->
Attributes are marked up using the syntax name:.
An attribute name can, optionally, be followed by a string to be used as
its value; if a value isn’t provided, the attribute is assumed to be boolean
(and present). Note that a string used as an attributes value cannot be “raw”
— that is, cannot be preceded by an exclamation mark.
meta charset: "utf-8"
<meta charset="utf-8">
Classes are marked up with a leading period, as in .class.
fieldset .upload-meta
input.required
<fieldset class="upload-meta"><input class="required"></fieldset>
Hierarchy in Razor Leaf is defined using indentation. For example:
doctype
html
head
meta charset: "utf-8"
title "Example"
link
rel: "stylesheet"
type: "text/css"
href: "stylesheets/example.css"
body
p id: "introduction"
"This template is a brief example of hierarchy."
<!DOCTYPE html><html><head><meta charset="utf-8"><title>Example</title><link rel="stylesheet" type="text/css" href="stylesheets/example.css"></head><body><p id="introduction">This template is a brief example of hierarchy.</p></body></html>
Content found after an element on the same line will also be considered that element’s content.
Comments begin with # and continue to the end of the line. They do not affect
the rendered HTML.
Code blocks begin with % and continue to the end of the line.
Code blocks may contain content (strings, elements, other code blocks,
and special blocks, but not attributes); if they do, they are treated as blocks
and wrapped in curly braces.
For example, this template:
% function countTo(n)
% for (var i = 1; i <= n; i++)
"#{i}"
% countTo(5);
might compile to this JavaScript:
function countTo(n) {
for (var i = 1; i <= n; i++) {
output += i;
}
}
countTo(5);
Some names define special blocks. These are:
doctype: Inserts <!DOCTYPE html>.if (condition): Includes its content only if condition is met.elif (condition): Can immediately follow an if or an elif.else: Can immediately follow an if or an elif.for (identifier) of (collection): Includes its content for each element of the array or array-like object collection.for (identifier), (index) of (collection): Allows the index variable in a for loop to be named.include (name): Loads and includes another template.extends (name): Loads another template and replaces its blocks. A template that extends another template cannot have any content outside of block actions.block (name): Defines a replaceable block.replace (name): Replaces a block.append (name): Appends to a block.new razorleaf.DirectoryLoader(root, [options])Creates a loader that maps template names to files with the .rl extension
in the directory located at root.
razorleaf.DirectoryLoader.prototype.load(name)Returns a template object loaded from the root directory.
razorleaf.compile(template, [options])Compiles a template string into a function. The compiled function takes
one argument, data, which can be used (under that name) in the template.
debug: If true, warnings will be printed. (In a later version, this will enable error rewriting.)load(name): A function that returns a parsed template represented by name. This is filled automatically by most loaders.globals: An object representing the global variables that should be made available to the template.FAQs
A template engine for HTML
The npm package razorleaf receives a total of 2 weekly downloads. As such, razorleaf popularity was classified as not popular.
We found that razorleaf demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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