class Arborist::PosLookAhead

Overview

Non-consuming positive lookahead match of e

Defined in:

arborist.cr

Constructors

Instance Method Summary

Constructor Detail


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Instance Method Detail

def eval(matcher) : ParseTree | Nil #

this should return true if the expr matches, and nil otherwise; do not return false, because nil indicates parse failure


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def label(label : String) : PosLookAhead #

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def label : String | Nil #

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def label=(label : String | Nil) #

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def preorder_traverse(matcher, visit : Expr -> _, visited_nodes : Set(Expr)) #

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def to_s #
Description copied from class Object

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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