~singpolyma/dhall-ruby

ref: b1e721e1a55663a111d725614ae1f90eb566a412 dhall-ruby/lib/dhall/ast.rb -rw-r--r-- 7.0 KiB
b1e721e1Stephen Paul Weber Start to implement normalization rules 3 years ago
                                                                                
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
61
62
63
64
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
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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
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
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
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
311
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
341
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
369
370
371
# frozen_string_literal: true

require "value_semantics"

module Dhall
	class Expression
		def map_subexpressions(&_)
			# For expressions with no subexpressions
			self
		end
	end

	class Application < Expression
		def initialize(f, *args)
			if args.empty?
				raise ArgumentError, "Application requires at least one argument"
			end

			@f = f
			@args = args
		end

		def map_subexpressions(&block)
			self.class.new(block[@f], *@args.map(&block))
		end
	end

	class Function < Expression
		def initialize(var, type, body)
			@var = var
			@type = type
			@body = body
		end

		def map_subexpressions(&block)
			self.class.new(@var, block[@type], block[@body])
		end
	end

	class Forall < Function; end

	class Bool < Expression
		include(ValueSemantics.for_attributes do
			value Bool()
		end)

		def reduce(when_true, when_false)
			value ? when_true : when_false
		end
	end

	class Variable < Expression
		include(ValueSemantics.for_attributes do
			name String, default: "_"
			index (0..Float::INFINITY), default: 0
		end)
	end

	class Operator < Expression
		include(ValueSemantics.for_attributes do
			lhs Expression
			rhs Expression
		end)

		def map_subexpressions(&block)
			with(lhs: block[@lhs], rhs: block[@rhs])
		end

		class Or < Operator; end
		class And < Operator; end
		class Equal < Operator; end
		class NotEqual < Operator; end
		class Plus < Operator; end
		class Times < Operator; end
		class TextConcatenate < Operator; end
		class ListConcatenate < Operator; end
		class RecordMerge < Operator; end
		class RecordOverride < Operator; end
		class RecordTypeMerge < Operator; end
		class ImportFallback < Operator; end
	end

	class List < Expression
		include(ValueSemantics.for_attributes do
			elements ArrayOf(Expression)
		end)

		def map_subexpressions(&block)
			with(elements: elements.map(&block))
		end
	end

	class EmptyList < List
		include(ValueSemantics.for_attributes do
			type Expression
		end)

		def map_subexpressions(&block)
			with(type: block[@type])
		end
	end

	class Optional < Expression
		def initialize(value, type=nil)
			raise TypeError, "value must not be nil" if value.nil?

			@value = value
			@type = type
		end

		def map_subexpressions(&block)
			self.class.new(block[@value], block[@type])
		end
	end

	class OptionalNone < Optional
		def initialize(type)
			raise TypeError, "type must not be nil" if type.nil?

			@type = type
		end

		def map_subexpressions(&block)
			self.class.new(block[@type])
		end
	end

	class Merge < Expression
		def initialize(record, input, type)
			@record = record
			@input = input
			@type = type
		end

		def map_subexpressions(&block)
			self.class.new(block[@record], block[@input], block[@type])
		end
	end

	class RecordType < Expression
		def initialize(record)
			@record = record
		end

		def map_subexpressions(&block)
			self.class.new(
				Hash[*@record.map { |k, v| [k, block[v]] }],
				block[@input],
				block[@type]
			)
		end
	end

	class Record < Expression
		def initialize(record)
			@record = record
		end

		def map_subexpressions(&block)
			self.class.new(Hash[*@record.map { |k, v| [k, block[v]] }])
		end
	end

	class RecordFieldAccess < Expression
		def initialize(record, field)
			raise TypeError, "field must be a String" unless field.is_a?(String)

			@record = record
			@field = field
		end

		def map_subexpressions(&block)
			self.class.new(Hash[*@record.map { |k, v| [k, block[v]] }], @field)
		end
	end

	class RecordProjection < Expression
		def initialize(record, *fields)
			unless fields.all? { |x| x.is_a?(String) }
				raise TypeError, "fields must be String"
			end

			@record = record
			@fields = fields
		end

		def map_subexpressions(&block)
			self.class.new(Hash[*@record.map { |k, v| [k, block[v]] }], @fields)
		end
	end

	class UnionType < Expression
		def initialize(record)
			@record = record
		end

		def map_subexpressions(&block)
			self.class.new(Hash[*@record.map { |k, v| [k, block[v]] }])
		end
	end

	class Union < Expression
		def initialize(tag, value, rest_of_type)
			raise TypeError, "tag must be a string" unless tag.is_a?(String)

			@tag = tag
			@value = value
			@rest_of_type = rest_of_type
		end

		def map_subexpressions(&block)
			self.class.new(
				@tag,
				block[@value],
				Hash[*@rest_of_type.map { |k, v| [k, block[v]] }]
			)
		end
	end

	class Constructors < Expression
		extend Gem::Deprecate

		def initialize(arg)
			@arg = arg
		end
		DEPRECATION_WIKI = "https://github.com/dhall-lang/dhall-lang/wiki/" \
		                   "Migration:-Deprecation-of-constructors-keyword"
		deprecate :initialize, DEPRECATION_WIKI, 2019, 4
	end

	class If < Expression
		include(ValueSemantics.for_attributes do
			predicate Expression
			self.then Expression
			self.else Expression
		end)

		def map_subexpressions(&block)
			with(
				predicate: block[predicate],
				then: block[self.then],
				else: block[self.else]
			)
		end
	end

	class Number < Expression
	end

	class Natural < Number
		include(ValueSemantics.for_attributes do
			value (0..Float::INFINITY)
		end)
	end

	class Integer < Number
		include(ValueSemantics.for_attributes do
			value ::Integer
		end)
	end

	class Double < Number
		include(ValueSemantics.for_attributes do
			value ::Float
		end)
	end

	class Text < Expression
		include(ValueSemantics.for_attributes do
			value ::String
		end)
	end

	class TextLiteral < Expression
		include(ValueSemantics.for_attributes do
			chunks ArrayOf(Expression)
		end)

		def map_subexpressions(&block)
			with(chunks: chunks.map(&block))
		end
	end

	class Import < Expression
		def initialize(integrity_check, import_type, path)
			@integrity_check = integrity_check
			@import_type = import_type
			@path = path
		end

		class URI
			def initialize(headers, authority, *path, query, fragment)
				@headers = headers
				@authority = authority
				@path = path
				@query = query
				@fragment = fragment
			end
		end

		class Http < URI; end
		class Https < URI; end

		class Path
			def initialize(*path)
				@path = path
			end
		end

		class AbsolutePath < Path; end
		class RelativePath < Path; end
		class RelativeToParentPath < Path; end
		class RelativeToHomePath < Path; end

		class EnvironmentVariable
			def initialize(var)
				@var = var
			end
		end

		class MissingImport; end

		class IntegrityCheck
			def initialize(protocol, data)
				@protocol = protocol
				@data = data
			end
		end
	end

	class Let
		def initialize(var, assign, type=nil)
			@var = var
			@assign = assign
			@type = type
		end

		def map_subexpressions(&block)
			self.class.new(@var, block[@assign], block[@type])
		end
	end

	class LetBlock < Expression
		def initialize(body, *lets)
			unless lets.all? { |x| x.is_a?(Let) }
				raise TypeError, "LetBlock only contains Let"
			end

			@lets = lets
			@body = body
		end

		def map_subexpressions(&block)
			self.class.new(
				block[@body],
				*@lets.map { |let| let.map_subexpressions(&block) }
			)
		end
	end

	class TypeAnnotation < Expression
		def initialize(value, type)
			@value = value
			@type = type
		end

		def map_subexpressions(&block)
			self.class.new(block[@value], block[@type])
		end
	end
end