Class: Bora::ParameterResolver

Inherits:
Object
  • Object
show all
Defined in:
lib/bora/parameter_resolver.rb

Constant Summary collapse

UnresolvedSubstitutionError = 
Class.new(StandardError)
PLACEHOLDER_REGEX =

Regular expression that can match placeholders nested to two levels. For example it will match: “$foo-${bar}”. See stackoverflow.com/questions/17759004/how-to-match-string-within-parentheses-nested-in-java

/\${([^{}]*|{[^{}]*})*}/

Instance Method Summary collapse

Constructor Details

#initialize(stack) ⇒ ParameterResolver

Returns a new instance of ParameterResolver.



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# File 'lib/bora/parameter_resolver.rb', line 13

def initialize(stack)
  @stack = stack
  @loader = ParameterResolverLoader.new
  @resolver_cache = {}
end

Instance Method Details

#resolve(params) ⇒ Object 



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# File 'lib/bora/parameter_resolver.rb', line 19

def resolve(params)
  unresolved_placeholders_still_remain = true
  while unresolved_placeholders_still_remain
    unresolved_placeholders_still_remain = false
    placeholders_were_substituted = false
    params.each do |k, v|
      resolved_value = process_param_substitutions(v, params)
      unresolved_placeholders_still_remain ||= unresolved_placeholder?(resolved_value)
      placeholders_were_substituted ||= resolved_value != v
      params[k] = resolved_value
    end
    if unresolved_placeholders_still_remain && !placeholders_were_substituted
      raise UnresolvedSubstitutionError, "Parameter substitutions could not be resolved:\n#{unresolved_placeholders_as_string(params)}"
    end
  end
  params
end