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module Sprockets
module Rails
# Rewrites source mapping urls with the digested paths and protect against semicolon appending with a dummy comment line
class SourcemappingUrlProcessor
REGEX = /\/\/# sourceMappingURL=(.*\.map)/
class << self
def call(input)
env = input[:environment]
context = env.context_class.new(input)
data = input[:data].gsub(REGEX) do |_match|
sourcemap_logical_path = combine_sourcemap_logical_path(sourcefile: input[:name], sourcemap: $1)
begin
resolved_sourcemap_comment(sourcemap_logical_path, context: context)
rescue Sprockets::FileNotFound
removed_sourcemap_comment(sourcemap_logical_path, filename: input[:filename], env: env)
end
end
{ data: data }
end
private
def combine_sourcemap_logical_path(sourcefile:, sourcemap:)
if (parts = sourcefile.split("/")).many?
parts[0..-2].append(sourcemap).join("/")
else
sourcemap
end
end
def resolved_sourcemap_comment(sourcemap_logical_path, context:)
"//# sourceMappingURL=#{sourcemap_asset_path(sourcemap_logical_path, context: context)}\n//!\n"
end
def sourcemap_asset_path(sourcemap_logical_path, context:)
# FIXME: Work-around for bug where if the sourcemap is nested two levels deep, it'll resolve as the source file
# that's being mapped, rather than the map itself. So context.resolve("a/b/c.js.map") will return "c.js?"
if context.resolve(sourcemap_logical_path) =~ /\.map/
context.asset_path(sourcemap_logical_path)
else
raise Sprockets::FileNotFound, "Failed to resolve source map asset due to nesting depth"
end
end
def removed_sourcemap_comment(sourcemap_logical_path, filename:, env:)
env.logger.warn "Removed sourceMappingURL comment for missing asset '#{sourcemap_logical_path}' from #{filename}"
nil
end
end
end
end
end
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