Class: Build::Rule

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

Overview

A rule is a function with a specific set of input and output parameters, which can match against a given set of specific arguments. For example, there might be several rules for compiling, but the specific rules depend on the language being compiled.

Defined Under Namespace

Classes: Parameter

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(process_name, type) ⇒ Rule

Returns a new instance of Rule.



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# File 'lib/build/rule.rb', line 114

def initialize(process_name, type)
  @name = process_name + "." + type
  @full_name = @name.gsub(/[^\w]/, '_')
  
  @process_name = process_name.gsub('-', '_').to_sym
  @type = type
  
  @apply = nil
  
  @parameters = []
  @primary_output = nil
end

Instance Attribute Details

#full_name ⇒ Object (readonly)

compile_cpp



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# File 'lib/build/rule.rb', line 136

def full_name
  @full_name
end

#name ⇒ Object (readonly)

compile.cpp



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# File 'lib/build/rule.rb', line 128

def name
  @name
end

#parameters ⇒ Object (readonly)

Returns the value of attribute parameters.



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# File 'lib/build/rule.rb', line 130

def parameters
  @parameters
end

#primary_output ⇒ Object (readonly)

Returns the value of attribute primary_output.



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# File 'lib/build/rule.rb', line 138

def primary_output
  @primary_output
end

#process_name ⇒ Object (readonly)

compile



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# File 'lib/build/rule.rb', line 133

def process_name
  @process_name
end

Class Method Details

.build(name, &block) ⇒ Object 



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# File 'lib/build/rule.rb', line 24

def self.build(name, &block)
  rule = self.new(*name.split('.', 2))
  
  rule.instance_eval(&block)
  
  return rule.freeze
end

Instance Method Details

#<<(parameter) ⇒ Object 



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# File 'lib/build/rule.rb', line 167

def << parameter
  @parameters << parameter
  
  if parameter.output?
    @primary_output ||= parameter
  end
end

#applicable?(arguments) ⇒ Boolean

Check if this rule can process these parameters

Returns:



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# File 'lib/build/rule.rb', line 176

def applicable?(arguments)
  @parameters.each do |parameter|
    next if parameter.implicit?
    
    return false unless parameter.applicable?(arguments)
  end
  
  return true
end

#apply(&block) ⇒ Object 



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# File 'lib/build/rule.rb', line 216

def apply(&block)
  @apply = Proc.new(&block)
end

#apply!(scope, arguments) ⇒ Object 



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# File 'lib/build/rule.rb', line 220

def apply!(scope, arguments)
  scope.instance_exec(arguments, &@apply) if @apply
end

#eql?(other) ⇒ Boolean

Returns:



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# File 'lib/build/rule.rb', line 234

def eql?(other)
  other.kind_of?(self.class) and @name.eql?(other.name) and @parameters.eql?(other.parameters)
end

#files(arguments) ⇒ Object 



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# File 'lib/build/rule.rb', line 195

def files(arguments)
  input_files = []
  output_files = []
  
  @parameters.each do |parameter|
    # This could probably be improved a bit, we are assuming all parameters are file based:
    value = arguments[parameter.name]
    
    next unless value
    
    case parameter.direction
    when :input
      input_files << value
    when :output
      output_files << value
    end
  end
  
  return Build::Files::Composite.new(input_files), Build::Files::Composite.new(output_files)
end

#freeze ⇒ Object 



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# File 'lib/build/rule.rb', line 140

def freeze
  return self if frozen?
  
  @name.freeze
  @full_name.freeze
  @process_name.freeze
  @type.freeze
  
  @apply.freeze
  @parameters.freeze
  @primary_output.freeze
  
  super
end

#hash ⇒ Object 



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# File 'lib/build/rule.rb', line 230

def hash
  [self.class, @name, @parameters].hash
end

#input(name, options = {}, &block) ⇒ Object 



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# File 'lib/build/rule.rb', line 155

def input(name, options = {}, &block)
  self << Parameter.new(:input, name, options, &block)
end

#normalize(arguments, scope) ⇒ Object

The scope is the context in which the dynamic rule computation is done, usually an instance of Task.



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# File 'lib/build/rule.rb', line 187

def normalize(arguments, scope)
  Hash[
    @parameters.collect do |parameter|
      [parameter.name, parameter.compute(arguments, scope)]
    end
  ]
end

#output(name, options = {}, &block) ⇒ Object 



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# File 'lib/build/rule.rb', line 163

def output(name, options = {}, &block)
  self << Parameter.new(:output, name, options, &block)
end

#parameter(name, options = {}, &block) ⇒ Object 



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# File 'lib/build/rule.rb', line 159

def parameter(name, options = {}, &block)
  self << Parameter.new(:argument, name, options, &block)
end

#result(arguments) ⇒ Object 



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# File 'lib/build/rule.rb', line 224

def result(arguments)
  if @primary_output
    arguments[@primary_output.name]
  end
end

#to_s ⇒ Object 



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# File 'lib/build/rule.rb', line 238

def to_s
  "#<#{self.class} #{@name.dump}>"
end