Class: Calyx::Grammar

Inherits:
Object
  • Object
show all
Defined in:
lib/calyx/grammar.rb,
lib/calyx/grammar/registry.rb,
lib/calyx/grammar/production/concat.rb,
lib/calyx/grammar/production/choices.rb,
lib/calyx/grammar/production/terminal.rb,
lib/calyx/grammar/production/expression.rb,
lib/calyx/grammar/production/non_terminal.rb,
lib/calyx/grammar/production/weighted_choices.rb

Defined Under Namespace

Modules: Production Classes: Registry

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(seed = nil, &block) ⇒ Grammar

Returns a new instance of Grammar.



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# File 'lib/calyx/grammar.rb', line 25

def initialize(seed=nil, &block)
  @seed = seed || Random.new_seed
  srand(@seed)

  if block_given?
    @registry = Registry.new
    @registry.instance_eval(&block)
  else
    @registry = self.class.registry
  end
end

Class Method Details

.inherit_registry(child_registry) ⇒ Object 



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# File 'lib/calyx/grammar.rb', line 16

def inherit_registry(child_registry)
  registry.combine(child_registry) unless child_registry.nil?
end

.inherited(subclass) ⇒ Object 



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# File 'lib/calyx/grammar.rb', line 20

def inherited(subclass)
  subclass.inherit_registry(registry)
end

.method_missing(name, *productions) ⇒ Object 



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# File 'lib/calyx/grammar.rb', line 12

def method_missing(name, *productions)
  registry.rule(name, *productions)
end

.registry ⇒ Object 



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# File 'lib/calyx/grammar.rb', line 4

def registry
  @registry ||= Registry.new
end

.rule(name, *productions, &production) ⇒ Object 



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# File 'lib/calyx/grammar.rb', line 8

def rule(name, *productions, &production)
  registry.rule(name, *productions)
end

Instance Method Details

#generate(*args) ⇒ Object 



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# File 'lib/calyx/grammar.rb', line 37

def generate(*args)
  start_symbol = :start
  rules_map = {}

  args.each do |arg|
    start_symbol = arg if arg.class == Symbol
    rules_map = arg if arg.class == Hash
  end

  @registry.evaluate(start_symbol, rules_map)
end