1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
# 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 < Struct.new(:id, :alias_name, :number, :tag, :term, :token_id, :nullable, :precedence, :printer, :error_token, keyword_init: true)
attr_accessor :first_set, :first_set_bitmap
attr_writer :eof_symbol, :error_symbol, :undef_symbol, :accept_symbol
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
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
|
