Class: RBS::Writer

Inherits:
Object
  • Object
show all
Defined in:
lib/rbs/writer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(out:) ⇒ Writer

Returns a new instance of Writer.



6
7
8
9
10
 
# File 'lib/rbs/writer.rb', line 6

def initialize(out:)
  @out = out
  @indentation = []
  @preserve = false
end

Instance Attribute Details

#indentation ⇒ Object (readonly)

Returns the value of attribute indentation.



4
5
6
 
# File 'lib/rbs/writer.rb', line 4

def indentation
  @indentation
end

#out ⇒ Object (readonly)

Returns the value of attribute out.



3
4
5
 
# File 'lib/rbs/writer.rb', line 3

def out
  @out
end

Instance Method Details

#attribute(kind, attr) ⇒ Object 



312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
 
# File 'lib/rbs/writer.rb', line 312

def attribute(kind, attr)
  visibility =
    case attr.visibility
    when :public
      "public "
    when :private
      "private "
    else
      ""
    end

  var = case attr.ivar_name
        when nil
          ""
        when false
          "()"
        else
          "(#{attr.ivar_name})"
        end

  receiver = case attr.kind
             when :singleton
               "self."
             when :instance
               ""
             end

  "#{visibility}attr_#{kind} #{receiver}#{attr.name}#{var}: #{attr.type}"
end

#indent(size = 2) ⇒ Object 



21
22
23
24
25
26
 
# File 'lib/rbs/writer.rb', line 21

def indent(size = 2)
  indentation.push(" " * size)
  yield
ensure
  indentation.pop
end

#method_name(name) ⇒ Object 



242
243
244
245
246
247
248
249
250
251
252
253
 
# File 'lib/rbs/writer.rb', line 242

def method_name(name)
  s = name.to_s

  case s
  when /\A(_?)[A-Za-z_]\w*(\?|!|=)?\Z/
    s
  when *%w(|  ^  &  <=>  ==  ===  =~  >   >=  <   <=   <<  >> +  -  *  /  %   **   ~   +@  -@  []  []=  ` ! != !~)
    s
  else
    "`#{s}`"
  end
end

#name_and_args(name, args) ⇒ Object 



168
169
170
171
172
173
174
175
176
 
# File 'lib/rbs/writer.rb', line 168

def name_and_args(name, args)
  if name && args
    if args.empty?
      "#{name}"
    else
      "#{name}[#{args.join(", ")}]"
    end
  end
end

#name_and_params(name, params) ⇒ Object 



156
157
158
159
160
161
162
163
164
165
166
 
# File 'lib/rbs/writer.rb', line 156

def name_and_params(name, params)
  if params.empty?
    "#{name}"
  else
    ps = params.each.map do |param|
      param.to_s
    end

    "#{name}[#{ps.join(", ")}]"
  end
end

#prefix ⇒ Object 



28
29
30
 
# File 'lib/rbs/writer.rb', line 28

def prefix
  indentation.join()
end

#preserve!(preserve: true) ⇒ Object 



16
17
18
19
 
# File 'lib/rbs/writer.rb', line 16

def preserve!(preserve: true)
  @preserve = preserve
  self
end

#preserve? ⇒ Boolean

Returns:

  • (Boolean) 


12
13
14
 
# File 'lib/rbs/writer.rb', line 12

def preserve?
  @preserve
end

#preserve_empty_line(prev, decl) ⇒ Object 



342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
 
# File 'lib/rbs/writer.rb', line 342

def preserve_empty_line(prev, decl)
  # @type var decl: _Located

  return unless prev

  if (_ = decl).respond_to?(:comment)
    if comment = (_ = decl).comment
      decl = comment
    end
  end

  prev_loc = prev.location
  decl_loc = decl.location

  if prev_loc && decl_loc
    prev_end_line = prev_loc.end_line
    start_line = decl_loc.start_line

    if start_line - prev_end_line > 1
      puts
    end
  else
    # When the signature is not constructed by the parser,
    # it always inserts an empty line.
    puts
  end
end

#put_lines(lines, leading_spaces:) ⇒ Object 



178
179
180
181
182
183
184
185
186
 
# File 'lib/rbs/writer.rb', line 178

def put_lines(lines, leading_spaces:)
  lines.each_line.with_index do |line, index|
    line.chomp!
    line.rstrip!
    line.sub!(/\A( {,#{leading_spaces}})/, '') if index > 0

    puts line
  end
end

#puts(string = "") ⇒ Object 



32
33
34
35
36
37
38
 
# File 'lib/rbs/writer.rb', line 32

def puts(string = "")
  if string.size > 0
    @out.puts("#{prefix}#{string}")
  else
    @out.puts
  end
end

#write(decls) ⇒ Object 



71
72
73
74
75
76
77
78
 
# File 'lib/rbs/writer.rb', line 71

def write(decls)
  [nil, *decls].each_cons(2) do |prev, decl|
    raise unless decl

    preserve_empty_line(prev, decl)
    write_decl decl
  end
end

#write_annotation(annotations) ⇒ Object 



40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
 
# File 'lib/rbs/writer.rb', line 40

def write_annotation(annotations)
  annotations.each do |annotation|
    string = annotation.string
    case
    when string !~ /\}/
      puts "%a{#{string}}"
    when string !~ /\)/
      puts "%a(#{string})"
    when string !~ /\]/
      puts "%a[#{string}]"
    when string !~ /\>/
      puts "%a<#{string}>"
    when string !~ /\|/
      puts "%a|#{string}|"
    end
  end
end

#write_comment(comment) ⇒ Object 



58
59
60
61
62
63
64
65
66
67
68
69
 
# File 'lib/rbs/writer.rb', line 58

def write_comment(comment)
  if comment
    comment.string.lines.each do |line|
      line = line.chomp
      unless line.empty?
        puts "# #{line}"
      else
        puts "#"
      end
    end
  end
end

#write_decl(decl) ⇒ Object 



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
108
109
110
111
112
113
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
 
# File 'lib/rbs/writer.rb', line 80

def write_decl(decl)
  case decl
  when AST::Declarations::Class
    super_class = if super_class = decl.super_class
                    " < #{name_and_args(super_class.name, super_class.args)}"
                  end
    write_comment decl.comment
    write_annotation decl.annotations
    puts "class #{name_and_params(decl.name, decl.type_params)}#{super_class}"

    indent do
      [nil, *decl.members].each_cons(2) do |prev, member|
        raise unless member

        preserve_empty_line prev, member
        write_member member
      end
    end

    puts "end"

  when AST::Declarations::Module
    self_type = unless decl.self_types.empty?
                  " : #{decl.self_types.join(", ")}"
                end

    write_comment decl.comment
    write_annotation decl.annotations

    puts "module #{name_and_params(decl.name, decl.type_params)}#{self_type}"

    indent do
      decl.members.each.with_index do |member, index|
        if index > 0
          puts
        end
        write_member member
      end
    end

    puts "end"
  when AST::Declarations::Constant
    write_comment decl.comment
    puts "#{decl.name}: #{decl.type}"

  when AST::Declarations::Global
    write_comment decl.comment
    puts "#{decl.name}: #{decl.type}"

  when AST::Declarations::Alias
    write_comment decl.comment
    write_annotation decl.annotations
    write_loc_source(decl) {
      puts "type #{name_and_params(decl.name, decl.type_params)} = #{decl.type}"
    }

  when AST::Declarations::Interface
    write_comment decl.comment
    write_annotation decl.annotations

    puts "interface #{name_and_params(decl.name, decl.type_params)}"

    indent do
      decl.members.each.with_index do |member, index|
        if index > 0
          puts
        end
        write_member member
      end
    end

    puts "end"

  end
end

#write_def(member) ⇒ Object 



263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
 
# File 'lib/rbs/writer.rb', line 263

def write_def(member)
  visibility =
    case member.visibility
    when :public
      "public "
    when :private
      "private "
    else
      ""
    end

  name = case member.kind
         when :instance
           "#{method_name(member.name)}"
         when :singleton_instance
           "self?.#{method_name(member.name)}"
         when :singleton
           "self.#{method_name(member.name)}"
         end

  string = ""

  prefix = "#{visibility}def #{name}:"
  padding = " " * (prefix.size-1)

  string << prefix

  member.types.each.with_index do |type, index|
    if index > 0
      string << padding
      string << "|"
    end

    string << " #{type}\n"
  end

  if member.overload
    if member.types.size > 0
      string << padding
      string << "|"
    end
    string << " ...\n"
  end

  string.each_line do |line|
    puts line.chomp
  end
end

#write_loc_source(located) ⇒ Object 



255
256
257
258
259
260
261
 
# File 'lib/rbs/writer.rb', line 255

def write_loc_source(located)
  if preserve? && loc = located.location
    put_lines(loc.source, leading_spaces: loc.start_column)
  else
    yield
  end
end

#write_member(member) ⇒ Object 



188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
 
# File 'lib/rbs/writer.rb', line 188

def write_member(member)
  case member
  when AST::Members::Include
    write_comment member.comment
    write_annotation member.annotations
    puts "include #{name_and_args(member.name, member.args)}"
  when AST::Members::Extend
    write_comment member.comment
    write_annotation member.annotations
    puts "extend #{name_and_args(member.name, member.args)}"
  when AST::Members::Prepend
    write_comment member.comment
    write_annotation member.annotations
    puts "prepend #{name_and_args(member.name, member.args)}"
  when AST::Members::AttrAccessor
    write_comment member.comment
    write_annotation member.annotations
    puts "#{attribute(:accessor, member)}"
  when AST::Members::AttrReader
    write_comment member.comment
    write_annotation member.annotations
    puts "#{attribute(:reader, member)}"
  when AST::Members::AttrWriter
    write_comment member.comment
    write_annotation member.annotations
    puts "#{attribute(:writer, member)}"
  when AST::Members::Public
    puts "public"
  when AST::Members::Private
    puts "private"
  when AST::Members::Alias
    write_comment member.comment
    write_annotation member.annotations
    new_name = member.singleton? ? "self.#{member.new_name}" : member.new_name
    old_name = member.singleton? ? "self.#{member.old_name}" : member.old_name
    puts "alias #{new_name} #{old_name}"
  when AST::Members::InstanceVariable
    write_comment member.comment
    puts "#{member.name}: #{member.type}"
  when AST::Members::ClassInstanceVariable
    write_comment member.comment
    puts "self.#{member.name}: #{member.type}"
  when AST::Members::ClassVariable
    write_comment member.comment
    puts "#{member.name}: #{member.type}"
  when AST::Members::MethodDefinition
    write_comment member.comment
    write_annotation member.annotations
    write_loc_source(member) { write_def member }
  else
    write_decl member
  end
end