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require "English"
module Dotenv
module Substitutions
# Substitute variables in a value.
#
# HOST=example.com
# URL="https://$HOST"
#
module Variable
class << self
VARIABLE = /
(\\)? # is it escaped with a backslash?
(\$) # literal $
\{? # allow brace wrapping
([A-Z0-9_]+) # match the variable
\}? # closing brace
/xi
def call(value, env)
value.gsub(VARIABLE) do |variable|
match = $LAST_MATCH_INFO
if match[1] == '\\'
variable[1..-1]
else
env.fetch(match[3]) { ENV[match[3]] }
end
end
end
end
end
end
end
|
