Class: Kaiseki::Rule

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, grammar, &block) ⇒ Rule

Returns a new instance of Rule.



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# File 'lib/rule.rb', line 5

def initialize name, grammar, &block
	@name = name
	@grammar = grammar
	@parseable = nil
	
	instance_eval &block if block_given?
end

Instance Attribute Details

#parseable ⇒ Object (readonly)

Returns the value of attribute parseable.



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# File 'lib/rule.rb', line 3

def parseable
  @parseable
end

Instance Method Details

#action(node = @name, &block) ⇒ Object 



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# File 'lib/rule.rb', line 113

def action node = @name, &block
	if @parseable
		unless @grammar.nodes.key? @name
			@grammar.nodes[@name] = Node.default
		end
		@parseable = @parseable.action node, &block
	else
		raise "parseable for rule #{@name.inspect} undefined"
	end
end

#cast(to_class) ⇒ Object 



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# File 'lib/rule.rb', line 62

def cast to_class
	if @parseable
		@parseable = @parseable.cast to_class
	else
		raise "parseable for rule #{@name.inspect} undefined"
	end
end

#custom(is_predicate = false, &block) ⇒ Object 



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# File 'lib/rule.rb', line 21

def custom is_predicate = false, &block
	if @parseable
		raise "parseable for rule #{@name.inspect} already defined"
	else
		@parseable = CustomParser.new is_predicate, &block
	end
end

#filter(node = @name, &block) ⇒ Object 



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# File 'lib/rule.rb', line 102

def filter node = @name, &block
	if @parseable
		unless @grammar.nodes.key? @name
			@grammar.nodes[@name] = Node.default
		end
		@parseable = @parseable.filter node, &block
	else
		raise "parseable for rule #{@name.inspect} undefined"
	end
end

#merge ⇒ Object 



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# File 'lib/rule.rb', line 54

def merge
	if @parseable
		@parseable = @parseable.merge
	else
		raise "parseable for rule #{@name.inspect} undefined"
	end
end

#node(args, options = {}) ⇒ Object 



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# File 'lib/rule.rb', line 124

def node args, options = {}
	args.must_be Array
	if @grammar.nodes.key? @name
		raise "node #{@name.inspect} already defined"
	else
		parent = options[:class] || Node
		@grammar.nodes[@name] = parent.subclass args, options
	end
end

#override(options) ⇒ Object 



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# File 'lib/rule.rb', line 29

def override options
	if @parseable
		@parseable = @parseable.override options
	else
		raise "parseable for rule #{@name.inspect} undefined"
	end
end

#parses(parseable) ⇒ Object 



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# File 'lib/rule.rb', line 13

def parses parseable
	if @parseable
		raise "parseable for rule #{@name.inspect} already defined"
	else
		@parseable = parseable.to_parseable
	end
end

#set(*vars) ⇒ Object 



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# File 'lib/rule.rb', line 78

def set *vars
	if @parseable
		@parseable = @parseable.set *vars
	else
		raise "parseable for rule #{@name.inspect} undefined"
	end
end

#simplify(bool = true) ⇒ Object 



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# File 'lib/rule.rb', line 46

def simplify bool = true
	if @parseable
		@parseable = @parseable.override :simplify => bool
	else
		raise "parseable for rule #{@name.inspect} undefined"
	end
end

#skipping(parseable) ⇒ Object 



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# File 'lib/rule.rb', line 37

def skipping parseable
	if @parseable
		raise "skipping rule must not be a predicate" if parseable.predicate?
		@parseable = @parseable.override :skipping => parseable.to_parseable
	else
		raise "parseable for rule #{@name.inspect} undefined"
	end
end

#tag_error(name = @name) ⇒ Object 



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# File 'lib/rule.rb', line 94

def tag_error name = @name
	if @parseable
		@parseable = @parseable.tag_error name
	else
		raise "parseable for rule #{@name.inspect} undefined"
	end
end

#tag_result(name = @name) ⇒ Object 



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# File 'lib/rule.rb', line 86

def tag_result name = @name
	if @parseable
		@parseable = @parseable.tag_result name
	else
		raise "parseable for rule #{@name.inspect} undefined"
	end
end

#validates(validators) ⇒ Object 



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# File 'lib/rule.rb', line 70

def validates validators
	if @parseable
		@parseable = @parseable.validate validators
	else
		raise "parseable for rule #{@name.inspect} undefined"
	end
end