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module Lrama
class Grammar
class ParameterizingRule
class Resolver
attr_accessor :rules, :created_lhs_list
def initialize
@rules = []
@created_lhs_list = []
end
def add_parameterizing_rule(rule)
@rules << rule
end
def find(token)
select_rules(token).last
end
def created_lhs(lhs_s_value)
@created_lhs_list.reverse.find { |created_lhs| created_lhs.s_value == lhs_s_value }
end
private
def select_rules(token)
rules = select_rules_by_name(token.rule_name)
rules = rules.select { |rule| rule.required_parameters_count == token.args_count }
if rules.empty?
raise "Invalid number of arguments. `#{token.rule_name}`"
else
rules
end
end
def select_rules_by_name(rule_name)
rules = @rules.select { |rule| rule.name == rule_name }
if rules.empty?
raise "Parameterizing rule does not exist. `#{rule_name}`"
else
rules
end
end
end
end
end
end
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