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Filename : cdesc-Pattern.ri
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U:RDoc::NormalClass[iI"Pattern:ETI"Prism::Pattern;TI"Object;To:RDoc::Markup::Document:@parts[o;;[o:RDoc::Markup::Paragraph;[	I"OA pattern is an object that wraps a Ruby pattern matching expression. The ;TI"Kexpression would normally be passed to an `in` clause within a `case` ;TI"Jexpression or a rightward assignment expression. For example, in the ;TI"following snippet:;To:RDoc::Markup::BlankLine�o:RDoc::Markup::Verbatim;[I"case node
;TI"[in ConstantPathNode[ConstantReadNode[name: :Prism], ConstantReadNode[name: :Pattern]]
;TI"	end
;T:@format0o;	;[I"Bthe pattern is the <tt>ConstantPathNode[...]</tt> expression.;T@o;	;[
I"PThe pattern gets compiled into an object that responds to #call by running ;TI"Lthe #compile method. This method itself will run back through Prism to ;TI"Jparse the expression into a tree, then walk the tree to generate the ;TI"Knecessary callable objects. For example, if you wanted to compile the ;TI"1expression above into a callable, you would:;T@o;;[I"|callable = Prism::Pattern.new("ConstantPathNode[ConstantReadNode[name: :Prism], ConstantReadNode[name: :Pattern]]").compile
;TI"callable.call(node)
;T;0o;	;[	I"PThe callable object returned by #compile is guaranteed to respond to #call ;TI"Lwith a single argument, which is the node to match against. It also is ;TI"Rguaranteed to respond to #===, which means it itself can be used in a `case` ;TI"expression, as in:;T@o;;[I"case node
;TI"when callable
;TI"	end
;T;0o;	;[	I"KIf the query given to the initializer cannot be compiled into a valid ;TI"Pmatcher (either because of a syntax error or because it is using syntax we ;TI"Ido not yet support) then a Prism::Pattern::CompilationError will be ;TI"raised.;T:
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Prism;TcRDoc::NormalModule