Module: Emfrp::Typing

Extended by:
Typing
Included in:
Typing
Defined in:
lib/emfrp/typing/typing.rb,
lib/emfrp/typing/union_type.rb,
lib/emfrp/typing/typing_error.rb

Defined Under Namespace

Classes: TypeDetermineError, TypeMatchingError, UnionType

Instance Method Summary collapse

Instance Method Details

#additional_typing(top, definition) ⇒ Object 



15
16
17
18
 
# File 'lib/emfrp/typing/typing.rb', line 15

def additional_typing(top, definition)
  typing_syntax(top, definition)
  check_unbound_exp_type(definition, [])
end

#assoc(top, key, s) ⇒ Object 



109
110
111
 
# File 'lib/emfrp/typing/typing.rb', line 109

def assoc(top, key, s)
  top[:dict][key][s[:name][:desc]].get
end

#check_unbound_exp_type(syntax, allow_types) ⇒ Object 



223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
 
# File 'lib/emfrp/typing/typing.rb', line 223

def check_unbound_exp_type(syntax, allow_types)
  case syntax
  when FuncDef
    allow_types = [syntax[:typing]] + syntax[:params].map{|x| x[:typing]}
    check_unbound_exp_type(syntax.values, allow_types)
  when TValue
    check_unbound_exp_type(syntax.values, [syntax[:typing]])
  when NodeDef
    check_unbound_exp_type(syntax.values, [])
  when DataDef
    check_unbound_exp_type(syntax.values, [])
  when Syntax
    if syntax.has_key?(:typing) && syntax[:typing].has_var?
      syntax[:typing].typevars.each do |t|
        unless allow_types.any?{|at| at.include?(t)}
          raise TypeDetermineError.new(:undetermined, syntax[:typing], syntax)
        end
      end
    end
    check_unbound_exp_type(syntax.values, allow_types)
  when Array
    syntax.map{|e| check_unbound_exp_type(e, allow_types)}
  else
    # do nothing
  end
end

#clone_utypes(*utypes) ⇒ Object 



203
204
205
206
 
# File 'lib/emfrp/typing/typing.rb', line 203

def clone_utypes(*utypes)
  tbl = {}
  utypes.map{|t| t.clone_utype(tbl)}
end

#find_pattern_by_ref_name(pattern, name) ⇒ Object 



208
209
210
211
212
213
214
215
216
217
218
219
220
221
 
# File 'lib/emfrp/typing/typing.rb', line 208

def find_pattern_by_ref_name(pattern, name)
  if pattern[:ref] && pattern[:ref] == name
    pattern
  elsif pattern.is_a?(ValuePattern)
    pattern[:args].each do |p|
      if res = find_pattern_by_ref_name(p, name)
        return res
      end
    end
    return nil
  else
    return nil
  end
end

#get_var_typing(top, name, binder) ⇒ Object 



158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
 
# File 'lib/emfrp/typing/typing.rb', line 158

def get_var_typing(top, name, binder)
  case binder
  when DataDef
    typing_syntax(top, binder)
    binder[:typing]
  when NodeDef
    param = binder[:params].find{|x| x[:as] == name}
    param[:typing]
  when FuncDef
    param = binder[:params].find{|x| x[:name] == name}
    param[:typing]
  when Case
    pattern = find_pattern_by_ref_name(binder[:pattern], name)
    raise "Assertion error: pattern-match-var #{name[:desc]} is not found" unless pattern
    pattern[:typing]
  else
    raise "Assertion error: unexpected binder type #{binder.class}"
  end
end

#try_unify(expected_utype, real_utype, place, *factors) ⇒ Object 



250
251
252
253
254
 
# File 'lib/emfrp/typing/typing.rb', line 250

def try_unify(expected_utype, real_utype, place, *factors)
  real_utype.unify(expected_utype)
rescue UnionType::UnifyError => err
  raise TypeMatchingError.new(:unify, expected_utype, real_utype, place, *factors)
end

#typing(top, s = top) ⇒ Object 



9
10
11
12
13
 
# File 'lib/emfrp/typing/typing.rb', line 9

def typing(top, s=top)
  typing_syntax(top, s)
  typing_node(top)
  check_unbound_exp_type(s, [])
end

#typing_exp(top, e) ⇒ Object 



114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
 
# File 'lib/emfrp/typing/typing.rb', line 114

def typing_exp(top, e)
  case e
  when FuncCall
    f = assoc(top, :func_space, e)
    typing_syntax(top, f)
    return_type, *arg_types = clone_utypes(f[:typing], *f[:params].map{|x| x[:typing]})
    e[:args].zip(arg_types).each do |a, t|
      try_unify(t, typing_exp(top, a), "argument of function `#{f[:name][:desc]}'", a)
    end
    return e[:typing] = return_type
  when ValueConst
    tvalue = assoc(top, :const_space, e)
    typing_syntax(top, tvalue)
    return_type, *arg_types = clone_utypes(tvalue[:typing], *tvalue[:params].map{|x| x[:typing]})
    e[:args].zip(arg_types).each do |a, t|
      try_unify(t, typing_exp(top, a), "argument of value-constructor `#{tvalue[:name][:desc]}'", a)
    end
    return e[:typing] = return_type
  when MatchExp
    pattern_type = UnionType.new
    return_type = UnionType.new
    e[:cases].each do |c|
      try_unify(pattern_type, typing_pattern(top, c[:pattern]), "pattern of MatchExp", c[:pattern])
      try_unify(return_type, typing_exp(top, c[:exp]), "body-expression of MatchExp", c[:exp])
    end
    try_unify(pattern_type, typing_exp(top, e[:exp]), "left-exp of MatchExp", e[:exp])
    return e[:typing] = return_type
  when LiteralIntegral
    return e[:typing] = UnionType.new("Int", [])
  when LiteralFloating
    return e[:typing] = UnionType.new("Double", [])
  when LiteralChar
    return e[:typing] = UnionType.new("Char", [])
  when VarRef
    return e[:typing] = get_var_typing(top, e[:name], e[:binder].get)
  when SkipExp
    return e[:typing] = UnionType.new
  when ParenthExp
    return e[:typing] = typing_exp(top, e[:exp])
  else
    raise "Assertion error: unexpected exp type #{e.class}"
  end
end

#typing_node(top) ⇒ Object 



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
 
# File 'lib/emfrp/typing/typing.rb', line 20

def typing_node(top)
  # typing Inputs
  top[:inputs].each do |i|
    i[:typing] = UnionType.from_type(i[:type])
    if i[:init_exp]
      init_exp_type = typing_exp(top, i[:init_exp])
      try_unify(i[:typing], init_exp_type, "init-exp for input `#{i[:name][:desc]}`", i[:init_exp])
    end
  end
  # typing Nodes
  top[:nodes].each do |n|
    n[:typing] = UnionType.new
    n[:params].each do |x|
      x[:typing] = UnionType.new
    end
    if n[:init_exp]
      init_exp_type = typing_exp(top, n[:init_exp])
      try_unify(n[:typing], init_exp_type, "init-exp for node `#{n[:name][:desc]}`", n[:init_exp])
    end
    body_exp_type = typing_exp(top, n[:exp])
    try_unify(n[:typing], body_exp_type, "body-exp for node `#{n[:name][:desc]}`", n[:exp])
    if n[:type]
      try_unify(UnionType.from_type(n[:type]), n[:typing], "type-annotation for node `#{n[:name][:desc]}'", n)
    end
  end
  # unify Outputs and Nodes
  top[:outputs].each do |x|
    if x[:type]
      x[:typing] = UnionType.from_type(x[:type])
    else
      x[:typing] = UnionType.new
    end
    node = assoc(top, :node_space, x)
    try_unify(node[:typing], x[:typing], "output `#{x[:name][:desc]}'", x)
  end
  # unify Node-params and Nodes
  top[:nodes].each do |n|
    n[:params].each do |param|
      node = assoc(top, :node_space, param)
      s = "parameter `#{param[:name][:desc]}' for node `#{n[:name][:desc]}'"
      try_unify(node[:typing], param[:typing], s, param)
    end
  end
end

#typing_pattern(top, pattern) ⇒ Object 



178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
 
# File 'lib/emfrp/typing/typing.rb', line 178

def typing_pattern(top, pattern)
  case pattern
  when AnyPattern
    pattern[:typing] = UnionType.new
  when ValuePattern
    tvalue = assoc(top, :const_space, pattern)
    typing_syntax(top, tvalue)
    return_type, *etypes = clone_utypes(tvalue[:typing], *tvalue[:params].map{|x| x[:typing]})
    rtypes = pattern[:args].map{|a| typing_pattern(top, a)}
    pattern[:args].each_with_index do |a, i|
      try_unify(etypes[i], rtypes[i], "arg for pattern `#{pattern[:name][:desc]}'", a)
    end
    pattern[:typing] = return_type
  when IntegralPattern
    pattern[:typing] = UnionType.new("Int", [])
  else
    raise "Assertion error: unexpected pattern type #{pattern.class}"
  end
  if pattern[:type]
    s = "type annotation for pattern"
    try_unify(UnionType.from_type(pattern[:type]), pattern[:typing], s, pattern)
  end
  return pattern[:typing]
end

#typing_syntax(top, s) ⇒ Object 



65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
 
# File 'lib/emfrp/typing/typing.rb', line 65

def typing_syntax(top, s)
  if s.is_a?(Syntax)
    return if s.has_key?(:typing)
    if s.has_key?(:typing_lock)
      raise CompileError.new("`#{s[:name][:desc]}' is defined recursively:\n", s)
    end
    s[:typing_lock] = true
  end
  case s
  when FuncDef
    tbl = {}
    s[:params].each do |x|
      x[:typing] = x[:type] ? UnionType.from_type(x[:type], tbl) : UnionType.new
    end
    s[:typing] = typing_exp(top, s[:exp])
    if s[:type]
      str = "type-annotation for func `#{s[:name][:desc]}'"
      try_unify(UnionType.from_type(s[:type], tbl), s[:typing], str, s)
    end
  when DataDef
    s[:typing] = typing_exp(top, s[:exp])
    if s[:type]
      str = "type-annotation for data `#{s[:name][:desc]}'"
      try_unify(UnionType.from_type(s[:type], tbl), s[:typing], str, s)
    end
  when PrimFuncDef
    s[:params].each do |x|
      x[:typing] = UnionType.from_type(x[:type])
    end
    s[:typing] = UnionType.from_type(s[:type])
  when TValue
    tbl = {}
    s[:params].each do |x|
      x[:typing] = UnionType.from_type(x[:type], tbl)
    end
    s[:typing] = UnionType.from_type(s[:type_def].get[:type], tbl)
  when Syntax
    typing_syntax(top, s.values)
  when Array
    s.each{|x| typing_syntax(top, x)}
  end
  s.delete(:typing_lock) if s.is_a?(Syntax)
end