buseref

v1.3.2

Published

2 years ago

Parse build blocks in HTML files to replace references

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binarygeotech

build blocks build comments replace scripts link ref

buseref

Parse build blocks in HTML files to replace references

Forked from the Jonathan Kemp useref with more options.

Installation

npm install buseref

Usage

var useref = require('buseref');
var result = useref(inputHtml);
// result = [ replacedHtml, { type: { path: { 'assets': [ replacedFiles] }}} ]

var useref = require('buseref');
var result = useref.file(filename);
// result = [ replacedHtml, { type: { path: { 'assets': [ replacedFiles] }}} ]

Blocks are expressed as:

<!-- build:<type>(alternate search path) <path> <parameters> -->
... HTML Markup, list of script / link tags.
<!-- endbuild -->

type: either js, css or remove
alternate search path: (optional) By default the input files are relative to the treated file. Alternate search path allows one to change that
path: the file path of the optimized file, the target output
parameters: extra parameters that should be added to the tag

An example of this in completed form can be seen below:

<html>
<head>
  <!-- build:css css/combined.css -->
  <link href="css/one.css" rel="stylesheet">
  <link href="css/two.css" rel="stylesheet">
  <!-- endbuild -->
</head>
<body>
  <!-- build:js scripts/combined.js -->
  <script type="text/javascript" src="scripts/one.js"></script>
  <script type="text/javascript" src="scripts/two.js"></script>
  <!-- endbuild -->

  <!-- build:js scripts/async.js async data-foo="bar" -->
  <script type="text/javascript" src="scripts/three.js"></script>
  <script type="text/javascript" src="scripts/four.js"></script>
  <!-- endbuild -->
</body>
</html>

The module would be used with the above sample HTML as follows:

var result = useref(sampleHtml);

// [
//   resultHtml,
//   {
//     css: {
//       'css/combined.css': {
//         'assets': [ 'css/one.css', 'css/two.css' ]
//       }
//     },
//     js: {
//       'scripts/combined.js': {
//         'assets': [ 'scripts/one.js', 'scripts/two.js' ]
//       },
//       'scripts/async.js': {
//          'assets': [ 'scripts/three.js', 'scripts/four.js' ]
//        }
//     }
//   }
// ]

The resulting HTML would be:

<html>
<head>
  <link rel="stylesheet" href="css/combined.css"/>
</head>
<body>
  <script src="scripts/combined.js"></script>
  <script src="scripts/async.js" async data-foo="bar" ></script>
</body>
</html>

IE Conditional Comments

Internet Explorer Conditional Comments are preserved. The code below:

<!-- build:js scripts/combined.js   -->
<!--[if lt IE 9]>
<script type="text/javascript" src="scripts/this.js"></script>
<script type="text/javascript" src="scripts/that.js"></script>
<![endif]-->
<!-- endbuild -->

Results in:

<!--[if lt IE 9]>
<script src="scripts/combined.js"></script>
<![endif]-->

Custom blocks

Sometimes you need a bit more. If you would like to do custom processing, this is possible with a custom block, as demonstrated below.

<!-- build:import components -->
<link rel="import" href="/bower_components/some/path"></link>
<!-- endbuild -->

With

var useref = require('buseref');
var result = useref(inputHtml, {
  // each property corresponds to any blocks with the same name, e.g. "build:import"
  import: function (content, target, options, alternateSearchPath) {
    // do something with `content` and return the desired HTML to replace the block content
    return content.replace('bower_components', target);
  }
});

Becomes

<link rel="import" href="/components/some/path"></link>

The handler function gets the following arguments:

content (String): The content of the custom use block
target (String): The "path" value of the use block definition
options (String): The extra attributes from the use block definition, the developer can parse as JSON or do whatever they want with it
alternateSearchPath (String): The alternate search path that can be used to maintain a coherent interface with standard handlers

Include a handler for each custom block type.

Symfony Twig and Laravel 5 Blade assets

Works with the symfony2 assetic and laravel asset and elixir links in twig or blade or html or php.

<!-- build:js scripts/combined.js -->
<script src="{{ asset('symfony/js/script.js') }}"></script>
<script src="{{ elixir('laravel/js/script.js') }}"></script>
<!-- endbuild -->

Options

options.noconcat

Type: Boolean
Default: false

Strips out build comments but leaves the rest of the block intact without replacing any tags.

<!-- build:js scripts/combined.js   -->
<script type="text/javascript" src="scripts/this.js"></script>
<script type="text/javascript" src="scripts/that.js"></script>
<!-- endbuild -->

Results in:

<script type="text/javascript" src="scripts/this.js"></script>
<script type="text/javascript" src="scripts/that.js"></script>

options.render

Type: Boolean
Default: true

If value is false, it strips out build comments and replacing the block without rendering any link or script tags. Only useful with css and js blocks.

<!-- build:js scripts/combined.js   -->
<script type="text/javascript" src="scripts/this.js"></script>
<script type="text/javascript" src="scripts/that.js"></script>
<!-- endbuild -->

Results in:

scripts/combined.js

options.callback

Type: Function
Default: null

If you would like to do handle the processing of all blocks, this is possible with the callback, as demonstrated below.

<!-- build:css combined.css -->
<link href="css/one.css" rel="stylesheet">
<link href="css/two.css" rel="stylesheet">
<!-- endbuild -->

With

var useref = require('buseref');
var result = useref(inputHtml, {
  callback: function (content, type, target, attributes) {
    // do something with `content` and return the desired HTML to replace the block content
    // types: css, js or remove
    
    var ref = '';
    
    if (type === 'css') {
      // css link element regular expression
      // TODO: Determine if 'href' attribute is present.
      var regcss = /<?link.*?(?:>|\))/gmi;

      // Check to see if there are any css references at all.
      if (content.search(regcss) !== -1) {
        if (attributes) {
          ref = '<link rel="stylesheet" href="' + target + '" ' + attributes + '>';
        } else {
          ref = '<link rel="stylesheet" href="' + target + '">';
        }
      }
    }
    
    return ref;
  }
});

Becomes

<link rel="stylesheet" href="combined.css">

The handler function gets the following arguments:

content (String): The content of the custom use block
type (String): The block type; css, js or remove
target (String): The "path" value of the use block definition
attibutes (String): The extra attributes from the use block definition, the developer can parse as JSON or do whatever they want with it

Contributing

See the CONTRIBUTING Guidelines

Published

Vulnerabilities

Links

Maintainers

Keywords

Readme

buseref

Installation

Usage

IE Conditional Comments

Custom blocks

Symfony Twig and Laravel 5 Blade assets

Options

options.noconcat

options.render

options.callback

Contributing

License