Module: AssetHat::JS::Engines

Defined in:
lib/asset_hat/js.rb

Overview

Swappable JavaScript minification engines.

Class Method Summary collapse

Class Method Details

.jsmin(input_string) ⇒ Object

JavaScript minification engine that simply uses the JSMin gem, a Ruby port of Crockford’s JSMin.

Sources:



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# File 'lib/asset_hat/js.rb', line 79

def self.jsmin(input_string)
  JSMin.minify(input_string + "\n")
end

.weak(input_string) ⇒ Object

Barebones JavaScript minification engine that:

  • Skips leading/trailing whitespace for each line, excluding line breaks; and

  • Removes one-line comments that had no actual code on that line.



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# File 'lib/asset_hat/js.rb', line 48

def self.weak(input_string)
  input   = StringIO.new(input_string)
  output  = StringIO.new

  input.each do |line|
    # Remove indentation and trailing whitespace
    line.strip!
    next if line.blank?

    # Skip single-line comments
    next if !(line =~ /^\/\//).nil?
    # TODO: Also skip single-line comments that began mid-line, but not
    #       inside a string or regex

    # TODO: Skip multi-line comments
    # - Should not strip from within a string or regex
    # - Should not strip comments that begin with `/*!` (e.g., licenses)

    output.write(line + "\n")
  end

  output.rewind
  output.read
end