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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 $
(?!\() # shouldn't be followed by parenthesis
\{? # allow brace wrapping
([A-Z0-9_]+)? # optional alpha nums
\}? # closing brace
/xi
def call(value, env)
value.gsub(VARIABLE) do |variable|
match = $LAST_MATCH_INFO
if match[1] == "\\"
variable[1..]
elsif match[3]
env[match[3]] || ENV[match[3]] || ""
else
variable
end
end
end
end
end
end
end
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