class Racc::Sym

表示终结符和非终结符。

属性

assoc[RW]

expand[R]

hash[R]

heads[R]

缓存

ident[R]

locate[R]

precedence[RW]

serialized[W]

value[R]

公共类方法

new(value, dummyp) 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1051
def initialize(value, dummyp)
  @ident = nil
  @value = value
  @dummyp = dummyp

  @term  = nil
  @nterm = nil
  @should_terminal = false
  @precedence = nil
  case value
  when Symbol
    @to_s = value.to_s
    @serialized = value.inspect
    @string = false
  when String
    @to_s = value.inspect
    @serialized = value.dump
    @string = true
  when false
    @to_s = '$end'
    @serialized = 'false'
    @string = false
  else
    raise ArgumentError, "unknown symbol value: #{value.class}"
  end

  @heads    = []
  @locate   = []
  @snull    = nil
  @null     = nil
  @expand   = nil
  @useless  = nil
end

once_writer(nm) 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1086
      def once_writer(nm)
        nm = nm.id2name
        module_eval(<<-EOS)
          def #{nm}=(v)
            raise 'racc: fatal: @#{nm} != nil' unless @#{nm}.nil?
            @#{nm} = v
          end
        EOS
      end

公共实例方法

dummy?() 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1104
def dummy?
  @dummyp
end

inspect()

别名: to_s

nonterminal?() 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1112
def nonterminal?
  @nterm
end

null=(n) 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1174
def null=(n)
  @null = n
end

nullable?() 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1170
def nullable?
  @null
end

rule() 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1153
def rule
  Rule.new(nil, [self], UserAction.empty)
end

self_null?() 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1164
def self_null?
  @snull
end

serialize() 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1134
def serialize
  @serialized
end

should_terminal() 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1122
def should_terminal
  @should_terminal = true
end

should_terminal?() 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1126
def should_terminal?
  @should_terminal
end

string_symbol?() 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1130
def string_symbol?
  @string
end

term=(t) 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1116
def term=(t)
  raise 'racc: fatal: term= called twice' unless @term.nil?
  @term = t
  @nterm = !t
end

terminal?() 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1108
def terminal?
  @term
end

to_s() 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1143
def to_s
  @to_s.dup
end

也别名为: inspect

useless=(f) 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1185
def useless=(f)
  @useless = f
end

useless?() 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1181
def useless?
  @useless
end

|(x) 点击切换源码

# File racc-1.8.1/lib/racc/grammar.rb, line 1149
def |(x)
  rule() | x.rule
end