59 lines
1.5 KiB
Ruby
59 lines
1.5 KiB
Ruby
# frozen_string_literal: true
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module ExpandVariables
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VARIABLES_REGEXP = /\$([a-zA-Z_][a-zA-Z0-9_]*)|\${\g<1>}|%\g<1>%/.freeze
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class << self
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def expand(value, variables)
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replace_with(value, variables) do |vars_hash, last_match|
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match_or_blank_value(vars_hash, last_match)
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end
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end
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def expand_existing(value, variables)
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replace_with(value, variables) do |vars_hash, last_match|
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match_or_original_value(vars_hash, last_match)
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end
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end
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def possible_var_reference?(value)
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return unless value
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%w[$ %].any? { |symbol| value.include?(symbol) }
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end
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private
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def replace_with(value, variables)
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variables_hash = nil
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value.gsub(VARIABLES_REGEXP) do
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variables_hash ||= transform_variables(variables)
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yield(variables_hash, Regexp.last_match)
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end
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end
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def match_or_blank_value(variables, last_match)
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variables[last_match[1] || last_match[2]]
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end
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def match_or_original_value(variables, last_match)
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match_or_blank_value(variables, last_match) || last_match[0]
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end
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def transform_variables(variables)
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# Lazily initialise variables
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variables = variables.call if variables.is_a?(Proc)
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# Convert hash array to variables
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if variables.is_a?(Array)
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variables = variables.reduce({}) do |hash, variable|
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hash[variable[:key]] = variable[:value]
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hash
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end
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end
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variables
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end
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end
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end
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