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Contents
# Copyright, 2012, by Samuel G. D. Williams. <http://www.codeotaku.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
module Build
class Environment
class Evaluator
def initialize(environment)
@environment = environment
@cache = {}
end
def respond_to?(name, include_private = false)
@environment.include?(name) || super
end
def method_missing(name)
@cache[name] ||= object_value(@environment[name])
end
# Compute the literal object value for a given key:
def object_value(value)
case value
when Array
value.collect{|item| object_value(item)}.flatten
when Symbol
object_value(@environment[value])
when Proc
object_value(instance_exec(&value))
when Default
object_value(value.value)
when Replace
object_value(value.value)
else
value
end
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems