Module: Featurevisor::Conditions

Defined in:
lib/featurevisor/conditions.rb

Overview

Conditions module for evaluating feature flags and segments

Class Method Summary collapse

Class Method Details

.condition_is_matched(condition, context, get_regex) ⇒ Boolean

Check if a condition is matched against context

Parameters:

  • condition (Hash) —

    Condition to evaluate

  • context (Hash) —

    Context to evaluate against

  • get_regex (Proc) —

    Function to get regex for pattern matching

Returns:

  • (Boolean) —

    True if condition matches



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# File 'lib/featurevisor/conditions.rb', line 55

def self.condition_is_matched(condition, context, get_regex)
  attribute = condition["attribute"] || condition[:attribute]
  operator = condition["operator"] || condition[:operator]
  value = condition["value"] || condition[:value]
  regex_flags = condition["regexFlags"] || condition[:regexFlags]

  raw_context_value = get_value_with_presence(context, attribute)
  context_value_from_path = raw_context_value.equal?(MISSING) ? nil : raw_context_value
  attribute_exists = !raw_context_value.equal?(MISSING)

  case operator
  when "equals"
    attribute_exists && strict_equal?(context_value_from_path, value)
  when "notEquals"
    !attribute_exists || !strict_equal?(context_value_from_path, value)
  when "before", "after"
    date_in_context = portable_date(context_value_from_path)
    date_in_condition = portable_date(value)
    return false unless date_in_context && date_in_condition

    if operator == "before"
      date_in_context < date_in_condition
    else
      date_in_context > date_in_condition
    end
  when "in", "notIn"
    # in / notIn (where condition value is an array)
    if attribute_exists && value.is_a?(Array) &&
       (context_value_from_path.is_a?(String) || context_value_from_path.is_a?(Numeric) || context_value_from_path.nil?)
      matched = value.any? { |candidate| strict_equal?(candidate, context_value_from_path) }
      if operator == "in"
        matched
      else # notIn
        !matched
      end
    else
      false
    end
  when "contains", "notContains", "startsWith", "endsWith", "semverEquals", "semverNotEquals", "semverGreaterThan", "semverGreaterThanOrEquals", "semverLessThan", "semverLessThanOrEquals", "matches", "notMatches"
    # string operations
    if context_value_from_path.is_a?(String) && value.is_a?(String)
      value_in_context = context_value_from_path

      case operator
      when "contains"
        value_in_context.include?(value)
      when "notContains"
        !value_in_context.include?(value)
      when "startsWith"
        value_in_context.start_with?(value)
      when "endsWith"
        value_in_context.end_with?(value)
      when "semverEquals"
        Featurevisor.compare_versions(value_in_context, value) == 0
      when "semverNotEquals"
        Featurevisor.compare_versions(value_in_context, value) != 0
      when "semverGreaterThan"
        Featurevisor.compare_versions(value_in_context, value) == 1
      when "semverGreaterThanOrEquals"
        Featurevisor.compare_versions(value_in_context, value) >= 0
      when "semverLessThan"
        Featurevisor.compare_versions(value_in_context, value) == -1
      when "semverLessThanOrEquals"
        Featurevisor.compare_versions(value_in_context, value) <= 0
      when "matches"
        regex = get_regex.call(value, regex_flags || "")
        regex.match?(value_in_context)
      when "notMatches"
        regex = get_regex.call(value, regex_flags || "")
        !regex.match?(value_in_context)
      end
    else
      false
    end
  when "greaterThan", "greaterThanOrEquals", "lessThan", "lessThanOrEquals"
    # numeric operations
    if context_value_from_path.is_a?(Numeric) && value.is_a?(Numeric)
      value_in_context = context_value_from_path

      case operator
      when "greaterThan"
        value_in_context > value
      when "greaterThanOrEquals"
        value_in_context >= value
      when "lessThan"
        value_in_context < value
      when "lessThanOrEquals"
        value_in_context <= value
      end
    else
      false
    end
  when "exists"
    attribute_exists
  when "notExists"
    !attribute_exists
  when "includes", "notIncludes"
    # includes / notIncludes (where context value is an array)
    if context_value_from_path.is_a?(Array) &&
       (value.is_a?(String) || value.is_a?(Numeric) || value == true || value == false || value.nil?)
      matched = context_value_from_path.any? { |candidate| strict_equal?(candidate, value) }
      if operator == "includes"
        matched
      else # notIncludes
        !matched
      end
    else
      false
    end
  else
    false
  end
end

.get_value_from_context(obj, path) ⇒ Object?

Get value from context object using dot notation path

Parameters:

  • obj (Hash) —

    Context object

  • path (String) —

    Dot-separated path to the value

Returns:

  • (Object, nil) —

    Value at the path or nil if not found



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# File 'lib/featurevisor/conditions.rb', line 16

def self.get_value_from_context(obj, path)
  return nil if obj.nil? || path.nil?

  value = get_value_with_presence(obj, path)
  value.equal?(MISSING) ? nil : value
end