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Filename : cdesc-Dispatcher.ri
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U:RDoc::NormalClass[iI"Dispatcher:ETI"Prism::Dispatcher;TI"Visitor;To:RDoc::Markup::Document:@parts[o;;[o:RDoc::Markup::Paragraph;[I"QThe dispatcher class fires events for nodes that are found while walking an ;TI"QAST to all registered listeners. It's useful for performing different types ;TI"Dof analysis on the AST while only having to walk the tree once.;To:RDoc::Markup::BlankLine�o;	;[I"RTo use the dispatcher, you would first instantiate it and register listeners ;TI")for the events you're interested in:;T@o:RDoc::Markup::Verbatim;[I"class OctalListener
;TI"'  def on_integer_node_enter(node)
;TI"9    if node.octal? && !node.slice.start_with?("0o")
;TI"G      warn("Octal integers should be written with the 0o prefix")
;TI"
    end
;TI"  end
;TI"	end
;TI"
;TI""listener = OctalListener.new
;TI"(dispatcher = Prism::Dispatcher.new
;TI";dispatcher.register(listener, :on_integer_node_enter)
;T:@format0o;	;[I"QThen, you can walk any number of trees and dispatch events to the listeners:;T@o;;[I"-result = Prism.parse("001 + 002 + 003")
;TI"'dispatcher.dispatch(result.value)
;T;0o;	;[	I"OOptionally, you can also use `#dispatch_once` to dispatch enter and leave ;TI"Pevents for a single node without recursing further down the tree. This can ;TI"Rbe useful in circumstances where you want to reuse the listeners you already ;TI"Ihave registers but want to stop walking the tree at a certain point.;T@o;;[I"Dinteger = result.value.statements.body.first.receiver.receiver
;TI"&dispatcher.dispatch_once(integer);T;0:
@fileI"lib/prism/dispatcher.rb;T:0@omit_headings_from_table_of_contents_below0;
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Prism;TcRDoc::NormalModule