Class: Jammit::Compressor
- Inherits:
-
Object
- Object
- Jammit::Compressor
- Defined in:
- lib/jammit-core/compressor.rb
Overview
Uses the YUI Compressor or Closure Compiler to compress JavaScript. Always uses YUI to compress CSS (Which means that Java must be installed.) Also knows how to create a concatenated JST file. If “embed_assets” is turned on, creates “mhtml” and “datauri” versions of all stylesheets, with all enabled assets inlined into the css.
Constant Summary collapse
- EMBED_MIME_TYPES =
Mapping from extension to mime-type of all embeddable assets.
{ '.png' => 'image/png', '.jpg' => 'image/jpeg', '.jpeg' => 'image/jpeg', '.gif' => 'image/gif', '.tif' => 'image/tiff', '.tiff' => 'image/tiff', '.ttf' => 'font/truetype', '.otf' => 'font/opentype' }
- EMBED_EXTS =
Font extensions for which we allow embedding:
EMBED_MIME_TYPES.keys
- EMBED_FONTS =
['.ttf', '.otf']
- MAX_IMAGE_SIZE =
Maximum size for embeddable images (an IE8 limitation).
32 * 1024
- EMBED_DETECTOR =
CSS asset-embedding regexes for URL rewriting.
/url\(['"]?([^\s)]+\.[a-z]+)(\?\d+)?['"]?\)/
- EMBEDDABLE =
/[\A\/]embed\//
- EMBED_REPLACER =
/url\(__EMBED__([^\s)]+)(\?\d+)?\)/
- MHTML_START =
MHTML file constants.
"/*\r\nContent-Type: multipart/related; boundary=\"JAMMIT_MHTML_SEPARATOR\"\r\n\r\n"
- MHTML_SEPARATOR =
"--JAMMIT_MHTML_SEPARATOR\r\n"
- MHTML_END =
"*/\r\n"
- JST_START =
JST file constants.
"(function(){"
- JST_END =
"})();"
- COMPRESSORS =
{ :yui => YUI::JavaScriptCompressor, :closure => Closure::Compiler }
- DEFAULT_OPTIONS =
{ :yui => {:munge => true}, :closure => {} }
Instance Method Summary collapse
-
#compile_jst(paths) ⇒ Object
Compiles a single JST file by writing out a javascript that adds template properties to a top-level template namespace object.
-
#compress_css(paths, variant = nil, asset_url = nil) ⇒ Object
Concatenate and compress a list of CSS stylesheets.
-
#compress_js(paths) ⇒ Object
Concatenate together a list of JavaScript paths, and pass them through the YUI Compressor (with munging enabled).
-
#initialize ⇒ Compressor
constructor
Creating a compressor initializes the internal YUI Compressor from the “yui-compressor” gem, or the internal Closure Compiler from the “closure-compiler” gem.
Constructor Details
#initialize ⇒ Compressor
Creating a compressor initializes the internal YUI Compressor from the “yui-compressor” gem, or the internal Closure Compiler from the “closure-compiler” gem.
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# File 'lib/jammit-core/compressor.rb', line 56 def initialize @css_compressor = YUI::CssCompressor.new(Jammit.config[:css_compressor_options] || {}) flavor = Jammit.config[:javascript_compressor] || Jammit::DEFAULT_COMPRESSOR @options = DEFAULT_OPTIONS[flavor].merge(Jammit.config[:compressor_options] || {}) @js_compressor = COMPRESSORS[flavor].new(@options) end |
Instance Method Details
#compile_jst(paths) ⇒ Object
Compiles a single JST file by writing out a javascript that adds template properties to a top-level template namespace object. Adds a JST-compilation function to the top of the package, unless you’ve specified your own preferred function, or turned it off. JST templates are named with the basename of their file.
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# File 'lib/jammit-core/compressor.rb', line 89 def compile_jst(paths) namespace = Jammit.template_namespace compiled = paths.map do |path| template_name = File.basename(path, File.extname(path)) contents = File.read(path).gsub(/\n/, '').gsub("'", '\\\\\'') "#{namespace}.#{template_name} = #{Jammit.template_function}('#{contents}');" end compiler = Jammit.config[:include_jst_script] ? File.read(Jammit::DEFAULT_JST_SCRIPT) : ''; setup_namespace = "#{namespace} = #{namespace} || {};" [JST_START, setup_namespace, compiler, compiled, JST_END].flatten.join("\n") end |
#compress_css(paths, variant = nil, asset_url = nil) ⇒ Object
Concatenate and compress a list of CSS stylesheets. When compressing a :datauri or :mhtml variant, post-processes the result to embed referenced assets.
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# File 'lib/jammit-core/compressor.rb', line 73 def compress_css(paths, variant=nil, asset_url=nil) css = concatenate_and_tag_assets(paths, variant) css = @css_compressor.compress(css) if Jammit.compress_assets case variant when nil then return css when :datauri then return with_data_uris(css) when :mhtml then return with_mhtml(css, asset_url) else raise PackageNotFound, "\"#{variant}\" is not a valid stylesheet variant" end end |
#compress_js(paths) ⇒ Object
Concatenate together a list of JavaScript paths, and pass them through the YUI Compressor (with munging enabled).
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# File 'lib/jammit-core/compressor.rb', line 65 def compress_js(paths) js = concatenate(paths) Jammit.config[:compress_assets] ? @js_compressor.compress(js) : js end |