class Pegasus::Language::RuleAlternative

Overview

One of the alternatives of a rule.

#==(other : RuleAlternative)
#compute_optional_variants
Computes the variants created by optionals.
#compute_optional_variants(&)
Same as compute_optional_variants, but what's optional is now decided by the block.
#derives_lambda?
Determines if this rule alternative can be empty, or derive lambda.
#derives_lambda?(&)
Determines if the rule alternative can be empty, using the block to check whether each element can be empty or not.
#elements : Array(RuleElement)
The elements of the rule.
#lambda?
Checks if this specific alternative is the lambda alternative.

def self.new(elements : Array(Pegasus::Language::RuleElement)) #

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def ==(other : RuleAlternative) #

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def compute_optional_variants #

Computes the variants created by optionals. For example, a? b? has four variants, a b, a, b, .

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def compute_optional_variants(&) #

Same as compute_optional_variants, but what's optional is now decided by the block.

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def derives_lambda? #

Determines if this rule alternative can be empty, or derive lambda.

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def derives_lambda?(&) #

Determines if the rule alternative can be empty, using the block to check whether each element can be empty or not.

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def elements : Array(RuleElement) #

The elements of the rule.

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def lambda? #

Checks if this specific alternative is the lambda alternative.

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