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Contents
require "flipper/expression/builder"
require "flipper/expression/constant"
module Flipper
class Expression
include Builder
def self.build(object)
return object if object.is_a?(self) || object.is_a?(Constant)
case object
when Hash
name = object.keys.first
args = object.values.first
unless name
raise ArgumentError, "#{object.inspect} cannot be converted into an expression"
end
new(name, Array(args).map { |o| build(o) })
when String, Numeric, FalseClass, TrueClass
Expression::Constant.new(object)
when Symbol
Expression::Constant.new(object.to_s)
else
raise ArgumentError, "#{object.inspect} cannot be converted into an expression"
end
end
# Use #build
private_class_method :new
attr_reader :name, :function, :args
def initialize(name, args = [])
@name = name.to_s
@function = Expressions.const_get(name)
@args = args
end
def evaluate(context = {})
if call_with_context?
function.call(*args.map {|arg| arg.evaluate(context) }, context: context)
else
function.call(*args.map {|arg| arg.evaluate(context) })
end
end
def eql?(other)
other.is_a?(self.class) && @function == other.function && @args == other.args
end
alias_method :==, :eql?
def value
{
name => args.map(&:value)
}
end
private
def call_with_context?
function.method(:call).parameters.any? do |type, name|
name == :context && [:key, :keyreq].include?(type)
end
end
end
end
Dir[File.join(File.dirname(__FILE__), 'expressions', '*.rb')].sort.each do |file|
require "flipper/expressions/#{File.basename(file, '.rb')}"
end
Version data entries
10 entries across 10 versions & 1 rubygems