class Pione::Lang::DataExprNull
DataExprNull
is a data exppresion that accepts data nonexistence.
Public Instance Methods
accept_nonexistence?()
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# File lib/pione/lang/data-expr.rb, line 79 def accept_nonexistence? true end
eval(env)
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Evaluate the data expression. The result is myself.
# File lib/pione/lang/data-expr.rb, line 84 def eval(env) self end
match(name)
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# File lib/pione/lang/data-expr.rb, line 75 def match(name) nil end