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