Module: CoffeeScript

Defined in:
lib/coffee-rails-source-maps.rb

Class Method Summary collapse

Class Method Details

.compile(script, options = {}) ⇒ Object 



12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
 
# File 'lib/coffee-rails-source-maps.rb', line 12

def compile(script, options = {})
  script = script.read if script.respond_to?(:read)

  if options.key?(:no_wrap) && !options.key?(:bare)
    options[:bare] = options[:no_wrap]
  else
    options[:bare] = false
  end

  pathname = options[:pathname]
  if pathname.nil?
    return Source.context.call("CoffeeScript.compile", script, options)
  else
    clean_name = pathname.basename.to_s.split(".").first

    rel_path = if pathname.to_s.start_with?(Bundler.bundle_path.to_s)
      Pathname('bundler').join(pathname.relative_path_from(Bundler.bundle_path)).dirname
    else
      pathname.relative_path_from(Rails.root).dirname
    end

    map_dir = Rails.root.join("public/" + Rails.configuration.assets.prefix, "source_maps", rel_path)
    map_dir.mkpath

    map_file    = map_dir.join("#{clean_name}.map")
    coffee_file = map_dir.join("#{clean_name}.coffee")

    options[:sourceMap]   = true
    options[:filename]    = "#{clean_name}.coffee" # coffee requires filename option to work with source maps (see http://coffeescript.org/documentation/docs/coffee-script.html#section-4)
    options[:sourceFiles] = ["/#{coffee_file.relative_path_from(Rails.root.join("public"))}"] # specify coffee source file explicitly (see http://coffeescript.org/documentation/docs/sourcemap.html#section-8)

    wrapper = <<-WRAPPER
      (function(script, options) {
        try {
          return CoffeeScript.compile(script, options);
        } catch (err) {
          if (err instanceof SyntaxError && err.location) {
            throw new SyntaxError([options.filename, err.location.first_line + 1, err.location.first_column + 1].join(":") + ": " + err.message)
          } else {
            throw err;
          }
        }
      })
    WRAPPER

    ret = Source.context.call(wrapper, script, options)

    coffee_file.open('w') {|f| f.puts script }
    map_file.open('w')    {|f| f.puts ret["v3SourceMap"]}

    comment = "//# sourceMappingURL=/#{map_file.relative_path_from(Rails.root.join("public"))}\n"
    return ret['js'] + comment
  end

end