Class: Build::Rulebook

Inherits:
Object
  • Object
show all
Defined in:
lib/build/rulebook.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Rulebook

Returns a new instance of Rulebook.



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# File 'lib/build/rulebook.rb', line 25

def initialize
	@rules = {}
	@processes = {}
end

Instance Attribute Details

#rules ⇒ Object (readonly)

Returns the value of attribute rules.



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# File 'lib/build/rulebook.rb', line 30

def rules
  @rules
end

Class Method Details

.for(environment) ⇒ Object 



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# File 'lib/build/rulebook.rb', line 77

def self.for(environment)
	rulebook = self.new
	
	environment.defined.each do |name, define|
		object = define.klass.new(*name.split('.', 2))
		
		object.instance_eval(&define.block)
		
		object.freeze
		
		rulebook << object
	end
	
	return rulebook
end

Instance Method Details

#<<(rule) ⇒ Object 



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# File 'lib/build/rulebook.rb', line 32

def << rule
	@rules[rule.name] = rule

	# A cache for fast process/file-type lookup:
	processes = @processes[rule.process_name] ||= []
	processes << rule
end

#[](name) ⇒ Object 



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# File 'lib/build/rulebook.rb', line 40

def [] name
	@rules[name]
end

#with(superclass, state = {}) ⇒ Object 



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# File 'lib/build/rulebook.rb', line 44

def with(superclass, state = {})
	task_class = Class.new(superclass)
	
	# Define methods for all processes, e.g. task_class#compile
	@processes.each do |key, rules|
		# Define general rules, which use rule applicability for disambiguation:
		task_class.send(:define_method, key) do |arguments, &block|
			rule = rules.find{|rule| rule.applicable? arguments }
			
			if rule
				invoke_rule(rule, arguments, &block)
			else
				raise NoApplicableRule.new(key, arguments)
			end
		end
	end
	
	# Define methods for all rules, e.g. task_class#compile_cpp
	@rules.each do |key, rule|
		task_class.send(:define_method, rule.full_name) do |arguments, &block|
			invoke_rule(rule, arguments, &block)
		end
	end
	
	state.each do |key, value|
		task_class.send(:define_method, key) do
			value
		end
	end
	
	return task_class
end