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# Symbol is both of nterm and term
# `number` is both for nterm and term
# `token_id` is tokentype for term, internal sequence number for nterm
#
# TODO: Add validation for ASCII code range for Token::Char
module Lrama
class Grammar
class Symbol
attr_accessor :id, :alias_name, :tag, :number, :token_id, :nullable, :precedence,
:printer, :destructor, :error_token, :first_set, :first_set_bitmap
attr_reader :term
attr_writer :eof_symbol, :error_symbol, :undef_symbol, :accept_symbol
def initialize(id:, term:, alias_name: nil, number: nil, tag: nil, token_id: nil, nullable: nil, precedence: nil, printer: nil, destructor: nil)
@id = id
@alias_name = alias_name
@number = number
@tag = tag
@term = term
@token_id = token_id
@nullable = nullable
@precedence = precedence
@printer = printer
@destructor = destructor
end
def term?
term
end
def nterm?
!term
end
def eof_symbol?
!!@eof_symbol
end
def error_symbol?
!!@error_symbol
end
def undef_symbol?
!!@undef_symbol
end
def accept_symbol?
!!@accept_symbol
end
def display_name
alias_name || id.s_value
end
# name for yysymbol_kind_t
#
# See: b4_symbol_kind_base
# @type var name: String
def enum_name
case
when accept_symbol?
name = "YYACCEPT"
when eof_symbol?
name = "YYEOF"
when term? && id.is_a?(Lrama::Lexer::Token::Char)
name = number.to_s + display_name
when term? && id.is_a?(Lrama::Lexer::Token::Ident)
name = id.s_value
when nterm? && (id.s_value.include?("$") || id.s_value.include?("@"))
name = number.to_s + id.s_value
when nterm?
name = id.s_value
else
raise "Unexpected #{self}"
end
"YYSYMBOL_" + name.gsub(/\W+/, "_")
end
# comment for yysymbol_kind_t
def comment
case
when accept_symbol?
# YYSYMBOL_YYACCEPT
id.s_value
when eof_symbol?
# YYEOF
alias_name
when (term? && 0 < token_id && token_id < 128)
# YYSYMBOL_3_backslash_, YYSYMBOL_14_
alias_name || id.s_value
when id.s_value.include?("$") || id.s_value.include?("@")
# YYSYMBOL_21_1
id.s_value
else
# YYSYMBOL_keyword_class, YYSYMBOL_strings_1
alias_name || id.s_value
end
end
end
end
end
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