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# File 'lib/yagg/gen.rb', line 47
def
<<~`EOF`
class Lexel
attr_accessor :value
def values
[value]
end
def typeid
-1
end
def initialize(value)
raise TypeError unless self.class.check(value)
if self.class === value
self.value = value.value
elsif Lexel === value || Rule === value
raise TypeError
else
self.value = value
end
end
def self.check(value)
if Lexel === value || Rule === value
return self === value
end
true
end
def to_text
value.to_s
end
end
Unchecked = Struct.new(:values, :typeid)
class Rule
attr_accessor :typeid, :values
def to_text
values.map{|x| x.to_text}.join
end
def initialize(*values)
if values.length == 1 && Unchecked === values[0]
self.values = values[0].values
self.typeid = values[0].typeid
else
old = values
typeid, values = self.class.check(values)
raise TypeError, "\#{self.class.to_s}:can't find rule for \#{old}" unless typeid
if typeid == -1
self.values = values[0].values
self.typeid = values[0].typeid
else
self.values = values
self.typeid = typeid
end
end
end
def self.grammel(a)
case a
when /^[A-Z]/ then Scope.const_get(a.upcase)
when /^[a-z]/ then Scope.const_get(a.capitalize.gsub(/_([a-z])/){ $1.upcase })
when /^'(.)'/ then $1
else
raise TypeError, "unknown grammar token \#{a}"
end
end
def self.check_single(pattern, values)
i = 0
j = 0
output = []
while i < values.length && j < pattern.length
u = grammel(pattern[j])
if Class === u
output << u.new(values[i])
else
return nil if u != values[i]
output << values[i]
end
i += 1
j += 1
end
output
rescue TypeError
end
def to_text
self.values.map{|x| x.to_text}.join
end
def self.check_one(value, memo = {})
self::Includes.each{|x|
next if memo[x]
u = grammel(x)
case u
when String
return value if u == value
when lambda{|x| x < Lexel}
return u.new(value) if u.check(value)
else
if u === value
return u.new(Unchecked.new([value], -1))
else
r = u.check_one(value, memo.update({u: 1}))
return self.new(Unchecked.new([r], -1)) if r
end
end
}
nil
end
def self.check(values)
if values.length == 1
if self === values[0]
return -1, values
elsif (r = check_one(values[0], {}))
if self === r
return -1, r.values
else
return -1, [r]
end
else
return nil
end
return nil
end
self::Rules.each_with_index{|k, i|
next if k.size != values.size
r = check_single(k, values)
return i, r if r
}
nil
end
end
EOF
end
|