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# frozen_string_literal: true
module Gitlab
module Ci
class Config
module Interpolation
##
# This class matches the given function string with a predefined
# function and then applies it to the input value.
#
class FunctionsStack
Output = Struct.new(:value, :errors) do
def success?
errors.empty?
end
end
FUNCTIONS = [
Functions::Truncate
].freeze
attr_reader :errors
def initialize(function_expressions)
@errors = []
@functions = build_stack(function_expressions)
end
def valid?
errors.none?
end
def evaluate(input_value)
return Output.new(nil, errors) unless valid?
functions.reduce(Output.new(input_value, [])) do |output, function|
break output unless output.success?
output_value = function.execute(output.value)
if function.valid?
Output.new(output_value, [])
else
Output.new(nil, function.errors)
end
end
end
private
attr_reader :functions
def build_stack(function_expressions)
function_expressions.map do |function_expression|
matching_function = FUNCTIONS.find { |function| function.matches?(function_expression) }
if matching_function.present?
matching_function.new(function_expression)
else
message = "no function matching `#{function_expression}`: " \
'check that the function name, arguments, and types are correct'
errors << message
end
end
end
end
end
end
end
end
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