class

Arborist::Optional

Inherits Reference / Object

Constructors

new(exp : Arborist::Apply | Arborist::Choice | Arborist::Dot | Arborist::MutexAlt | Arborist::NegLookAhead | Arborist::Optional | Arborist::PosLookAhead | Arborist::Repetition | Arborist::RepetitionOnePlus | Arborist::Sequence | Arborist::Terminal)
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Instance methods

eval(matcher) : ParseTree | Nil

returns Array(ParseTree) | Nil

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label(label : String) : Optional
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label
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label=(label : String | Nil)
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preorder_traverse(matcher, visit : Expr -> _, visited_nodes : Set(Expr))
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to_s

Returns a nicely readable and concise string representation of this object, typically intended for users.

This method should usually not be overridden. It delegates to #to_s(IO) which can be overridden for custom implementations.

Also see #inspect.

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