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Contents
module Lrama
class Grammar
class ParameterizingRules
class Builder
# Builder for separated list of general parameterizing rules
class SeparatedList < Base
def initialize(token, rule_counter, lhs_tag, user_code, precedence_sym, line)
super
@separator = @args[0]
@token = @args[1]
@expected_argument_num = 2
end
# program: separated_list(',', number)
#
# =>
#
# program: separated_list_number
# separated_list_number: ε
# separated_list_number: separated_nonempty_list_number
# separated_nonempty_list_number: number
# separated_nonempty_list_number: separated_nonempty_list_number ',' number
def build
validate_argument_number!
rules = []
@build_token = Lrama::Lexer::Token::Ident.new(s_value: "separated_list_#{@token.s_value}")
separated_nonempty_list_token = Lrama::Lexer::Token::Ident.new(s_value: "separated_nonempty_list_#{@token.s_value}")
rules << Rule.new(id: @rule_counter.increment, _lhs: @build_token, _rhs: [], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
rules << Rule.new(id: @rule_counter.increment, _lhs: @build_token, _rhs: [separated_nonempty_list_token], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
rules << Rule.new(id: @rule_counter.increment, _lhs: separated_nonempty_list_token, _rhs: [@token], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
rules << Rule.new(id: @rule_counter.increment, _lhs: separated_nonempty_list_token, _rhs: [separated_nonempty_list_token, @separator, @token], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
rules
end
end
end
end
end
end
Version data entries
4 entries across 4 versions & 1 rubygems