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
|
require 'lrama/grammar/parameterizing_rules/builder/base'
require 'lrama/grammar/parameterizing_rules/builder/list'
require 'lrama/grammar/parameterizing_rules/builder/nonempty_list'
require 'lrama/grammar/parameterizing_rules/builder/option'
require 'lrama/grammar/parameterizing_rules/builder/separated_nonempty_list'
require 'lrama/grammar/parameterizing_rules/builder/separated_list'
module Lrama
class Grammar
class ParameterizingRules
# Builder for parameterizing rules
class Builder
RULES = {
option: Lrama::Grammar::ParameterizingRules::Builder::Option,
"?": Lrama::Grammar::ParameterizingRules::Builder::Option,
nonempty_list: Lrama::Grammar::ParameterizingRules::Builder::NonemptyList,
"+": Lrama::Grammar::ParameterizingRules::Builder::NonemptyList,
list: Lrama::Grammar::ParameterizingRules::Builder::List,
"*": Lrama::Grammar::ParameterizingRules::Builder::List,
separated_nonempty_list: Lrama::Grammar::ParameterizingRules::Builder::SeparatedNonemptyList,
separated_list: Lrama::Grammar::ParameterizingRules::Builder::SeparatedList,
}
def initialize(token, rule_counter, lhs_tag, user_code, precedence_sym, line)
@token = token
@key = token.s_value.to_sym
@rule_counter = rule_counter
@lhs_tag = lhs_tag
@user_code = user_code
@precedence_sym = precedence_sym
@line = line
@builder = nil
end
def build
create_builder
@builder.build
end
def build_token
create_builder
@builder.build_token
end
private
def create_builder
unless @builder
validate_key!
@builder = RULES[@key].new(@token, @rule_counter, @lhs_tag, @user_code, @precedence_sym, @line)
end
end
def validate_key!
raise "Parameterizing rule does not exist. `#{@key}`" unless RULES.key?(@key)
end
end
end
end
end
|
