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# frozen_string_literal: true
module ExpandVariables
class << self
def expand(value, variables)
variables_hash = nil
value.gsub(/\$([a-zA-Z_][a-zA-Z0-9_]*)|\${\g<1>}|%\g<1>%/) do
variables_hash ||= transform_variables(variables)
variables_hash[$1 || $2]
end
end
private
def transform_variables(variables)
# Lazily initialise variables
variables = variables.call if variables.is_a?(Proc)
# Convert hash array to variables
if variables.is_a?(Array)
variables = variables.reduce({}) do |hash, variable|
hash[variable[:key]] = variable[:value]
hash
end
end
variables
end
end
end
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