1
2
3
4
5
6
7
8
9
10
11
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
|
# frozen_string_literal: true
require 'sprockets/uri_utils'
require 'sprockets/path_utils'
module Sprockets
# This is a processor designed to add a source map "comment"
# to the bottom of a css or JS file that is serving a source
# map. An example of a comment might look like this
#
# //# application.js-80af0efcc960fc2ac93eda2f7b12e3db40ab360bf6ea269ceed3bea3678326f9.map
#
# As an asset is built it gets source map information added
# to the `asset.to_hash[:metadata][:map]` key. This contains all the
# information that is needed to build a source map file.
#
# To add this comment we must have an asset we can link to.
# To do this we ensure that the original asset is loaded, then
# we use a use a special mime type. For example `application/js-sourcemap+json`
# for a JS source map.
#
# This will trigger a new asset to be loaded and generated by the
# `SourceMapProcessor` processor.
#
# Finally once we have that file, we can generate a link to it
# with it's full fingerprint. This is done and then
# added to the original asset as a comment at the bottom.
#
class AddSourceMapCommentToAssetProcessor
def self.call(input)
case input[:content_type]
when "application/javascript"
comment = "\n//# sourceMappingURL=%s"
map_type = "application/js-sourcemap+json"
when "text/css"
comment = "\n/*# sourceMappingURL=%s */"
map_type = "application/css-sourcemap+json"
else
fail input[:content_type]
end
env = input[:environment]
uri, _ = env.resolve!(input[:filename], accept: input[:content_type])
asset = env.load(uri)
uri, _ = env.resolve!(input[:filename], accept: map_type)
map = env.load(uri)
uri, params = URIUtils.parse_asset_uri(input[:uri])
uri = env.expand_from_root(params[:index_alias]) if params[:index_alias]
path = PathUtils.relative_path_from(PathUtils.split_subpath(input[:load_path], uri), map.digest_path)
asset.metadata.merge(
data: asset.source + (comment % path) + "\n",
links: asset.links + [asset.uri, map.uri]
)
end
end
end
|
