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/*
Package amber is an elegant templating engine for Go Programming Language.
It is inspired from HAML and Jade.
Tags
A tag is simply a word:
html
is converted to
<html></html>
It is possible to add ID and CLASS attributes to tags:
div#main
span.time
are converted to
<div id="main"></div>
<span class="time"></span>
Any arbitrary attribute name / value pair can be added this way:
a[href="http://www.google.com"]
You can mix multiple attributes together
a#someid[href="/"][title="Main Page"].main.link Click Link
gets converted to
<a id="someid" class="main link" href="/" title="Main Page">Click Link</a>
It is also possible to define these attributes within the block of a tag
a
#someid
[href="/"]
[title="Main Page"]
.main
.link
| Click Link
Doctypes
To add a doctype, use `!!!` or `doctype` keywords:
!!! transitional
// <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
or use `doctype`
doctype 5
// <!DOCTYPE html>
Available options: `5`, `default`, `xml`, `transitional`, `strict`, `frameset`, `1.1`, `basic`, `mobile`
Tag Content
For single line tag text, you can just append the text after tag name:
p Testing!
would yield
<p>Testing!</p>
For multi line tag text, or nested tags, use indentation:
html
head
title Page Title
body
div#content
p
| This is a long page content
| These lines are all part of the parent p
a[href="/"] Go To Main Page
Data
Input template data can be reached by key names directly. For example, assuming the template has been
executed with following JSON data:
{
"Name": "Ekin",
"LastName": "Koc",
"Repositories": [
"amber",
"dateformat"
],
"Avatar": "/images/ekin.jpg",
"Friends": 17
}
It is possible to interpolate fields using `#{}`
p Welcome #{Name}!
would print
<p>Welcome Ekin!</p>
Attributes can have field names as well
a[title=Name][href="/ekin.koc"]
would print
<a title="Ekin" href="/ekin.koc"></a>
Expressions
Amber can expand basic expressions. For example, it is possible to concatenate strings with + operator:
p Welcome #{Name + " " + LastName}
Arithmetic expressions are also supported:
p You need #{50 - Friends} more friends to reach 50!
Expressions can be used within attributes
img[alt=Name + " " + LastName][src=Avatar]
Variables
It is possible to define dynamic variables within templates,
all variables must start with a $ character and can be assigned as in the following example:
div
$fullname = Name + " " + LastName
p Welcome #{$fullname}
If you need to access the supplied data itself (i.e. the object containing Name, LastName etc fields.) you can use `$` variable
p $.Name
Conditions
For conditional blocks, it is possible to use `if <expression>`
div
if Friends > 10
p You have more than 10 friends
else if Friends > 5
p You have more than 5 friends
else
p You need more friends
Again, it is possible to use arithmetic and boolean operators
div
if Name == "Ekin" && LastName == "Koc"
p Hey! I know you..
There is a special syntax for conditional attributes. Only block attributes can have conditions;
div
.hasfriends ? Friends > 0
This would yield a div with `hasfriends` class only if the `Friends > 0` condition holds. It is
perfectly fine to use the same method for other types of attributes:
div
#foo ? Name == "Ekin"
[bar=baz] ? len(Repositories) > 0
Iterations
It is possible to iterate over arrays and maps using `each`:
each $repo in Repositories
p #{$repo}
would print
p amber
p dateformat
It is also possible to iterate over values and indexes at the same time
each $i, $repo in Repositories
p
.even ? $i % 2 == 0
.odd ? $i % 2 == 1
Includes
A template can include other templates using `include`:
a.amber
p this is template a
b.amber
p this is template b
c.amber
div
include a
include b
gets compiled to
div
p this is template a
p this is template b
Inheritance
A template can inherit other templates. In order to inherit another template, an `extends` keyword should be used.
Parent template can define several named blocks and child template can modify the blocks.
master.amber
!!! 5
html
head
block meta
meta[name="description"][content="This is a great website"]
title
block title
| Default title
body
block content
subpage.amber
extends master
block title
| Some sub page!
block append meta
// This will be added after the description meta tag. It is also possible
// to prepend something to an existing block
meta[name="keywords"][content="foo bar"]
block content
div#main
p Some content here
License
(The MIT License)
Copyright (c) 2012 Ekin Koc <[email protected]>
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package amber