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# frozen_string_literal: true
module ExpandVariables
VARIABLES_REGEXP = /\$([a-zA-Z_][a-zA-Z0-9_]*)|\${\g<1>}|%\g<1>%/.freeze
class << self
def expand(value, variables)
replace_with(value, variables) do |vars_hash, last_match|
match_or_blank_value(vars_hash, last_match)
end
end
def expand_existing(value, variables)
replace_with(value, variables) do |vars_hash, last_match|
match_or_original_value(vars_hash, last_match)
end
end
private
def replace_with(value, variables)
variables_hash = nil
value.gsub(VARIABLES_REGEXP) do
variables_hash ||= transform_variables(variables)
yield(variables_hash, Regexp.last_match)
end
end
def match_or_blank_value(variables, last_match)
variables[last_match[1] || last_match[2]]
end
def match_or_original_value(variables, last_match)
match_or_blank_value(variables, last_match) || last_match[0]
end
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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