| 1 | #!/usr/bin/env python2
|
| 2 | """gen_python.py: Generate Python code from an ASDL schema."""
|
| 3 | from __future__ import print_function
|
| 4 |
|
| 5 | from collections import defaultdict
|
| 6 |
|
| 7 | from asdl import ast
|
| 8 | from asdl import visitor
|
| 9 | from asdl.util import log
|
| 10 |
|
| 11 | _ = log # shut up lint
|
| 12 |
|
| 13 | _PRIMITIVES = {
|
| 14 | 'string': 'str',
|
| 15 | 'int': 'int',
|
| 16 | 'uint16': 'int',
|
| 17 | 'BigInt': 'mops.BigInt',
|
| 18 | 'float': 'float',
|
| 19 | 'bool': 'bool',
|
| 20 | 'any': 'Any',
|
| 21 | # TODO: frontend/syntax.asdl should properly import id enum instead of
|
| 22 | # hard-coding it here.
|
| 23 | 'id': 'Id_t',
|
| 24 | }
|
| 25 |
|
| 26 |
|
| 27 | def _MyPyType(typ):
|
| 28 | """ASDL type to MyPy Type."""
|
| 29 | if isinstance(typ, ast.ParameterizedType):
|
| 30 |
|
| 31 | if typ.type_name == 'Dict':
|
| 32 | k_type = _MyPyType(typ.children[0])
|
| 33 | v_type = _MyPyType(typ.children[1])
|
| 34 | return 'Dict[%s, %s]' % (k_type, v_type)
|
| 35 |
|
| 36 | if typ.type_name == 'List':
|
| 37 | return 'List[%s]' % _MyPyType(typ.children[0])
|
| 38 |
|
| 39 | if typ.type_name == 'Optional':
|
| 40 | return 'Optional[%s]' % _MyPyType(typ.children[0])
|
| 41 |
|
| 42 | elif isinstance(typ, ast.NamedType):
|
| 43 | if typ.resolved:
|
| 44 | if isinstance(typ.resolved, ast.Sum): # includes SimpleSum
|
| 45 | return '%s_t' % typ.name
|
| 46 | if isinstance(typ.resolved, ast.Product):
|
| 47 | return typ.name
|
| 48 | if isinstance(typ.resolved, ast.Use):
|
| 49 | return ast.TypeNameHeuristic(typ.name)
|
| 50 |
|
| 51 | # 'id' falls through here
|
| 52 | return _PRIMITIVES[typ.name]
|
| 53 |
|
| 54 | else:
|
| 55 | raise AssertionError()
|
| 56 |
|
| 57 |
|
| 58 | def _DefaultValue(typ, mypy_type):
|
| 59 | """Values that the static CreateNull() constructor passes.
|
| 60 |
|
| 61 | mypy_type is used to cast None, to maintain mypy --strict for ASDL.
|
| 62 |
|
| 63 | We circumvent the type system on CreateNull(). Then the user is
|
| 64 | responsible for filling in all the fields. If they do so, we can
|
| 65 | rely on it when reading fields at runtime.
|
| 66 | """
|
| 67 | if isinstance(typ, ast.ParameterizedType):
|
| 68 | type_name = typ.type_name
|
| 69 |
|
| 70 | if type_name == 'Optional':
|
| 71 | return "cast('%s', None)" % mypy_type
|
| 72 |
|
| 73 | if type_name == 'List':
|
| 74 | return "[] if alloc_lists else cast('%s', None)" % mypy_type
|
| 75 |
|
| 76 | if type_name == 'Dict': # TODO: can respect alloc_dicts=True
|
| 77 | return "cast('%s', None)" % mypy_type
|
| 78 |
|
| 79 | raise AssertionError(type_name)
|
| 80 |
|
| 81 | if isinstance(typ, ast.NamedType):
|
| 82 | type_name = typ.name
|
| 83 |
|
| 84 | if type_name == 'id': # hard-coded HACK
|
| 85 | return '-1'
|
| 86 |
|
| 87 | if type_name == 'int':
|
| 88 | return '-1'
|
| 89 |
|
| 90 | if type_name == 'BigInt':
|
| 91 | return 'mops.BigInt(-1)'
|
| 92 |
|
| 93 | if type_name == 'bool':
|
| 94 | return 'False'
|
| 95 |
|
| 96 | if type_name == 'float':
|
| 97 | return '0.0' # or should it be NaN?
|
| 98 |
|
| 99 | if type_name == 'string':
|
| 100 | return "''"
|
| 101 |
|
| 102 | if isinstance(typ.resolved, ast.SimpleSum):
|
| 103 | sum_type = typ.resolved
|
| 104 | # Just make it the first variant. We could define "Undef" for
|
| 105 | # each enum, but it doesn't seem worth it.
|
| 106 | return '%s_e.%s' % (type_name, sum_type.types[0].name)
|
| 107 |
|
| 108 | # CompoundSum or Product type
|
| 109 | return 'cast(%s, None)' % mypy_type
|
| 110 |
|
| 111 | else:
|
| 112 | raise AssertionError()
|
| 113 |
|
| 114 |
|
| 115 | def _HNodeExpr(abbrev, typ, var_name):
|
| 116 | # type: (str, ast.TypeExpr, str) -> str
|
| 117 | none_guard = False
|
| 118 |
|
| 119 | if typ.IsOptional():
|
| 120 | typ = typ.children[0] # descend one level
|
| 121 |
|
| 122 | if isinstance(typ, ast.ParameterizedType):
|
| 123 | code_str = '%s.%s()' % (var_name, abbrev)
|
| 124 | none_guard = True
|
| 125 |
|
| 126 | elif isinstance(typ, ast.NamedType):
|
| 127 | type_name = typ.name
|
| 128 |
|
| 129 | if type_name == 'bool':
|
| 130 | code_str = "hnode.Leaf('T' if %s else 'F', color_e.OtherConst)" % var_name
|
| 131 |
|
| 132 | elif type_name in ('int', 'uint16'):
|
| 133 | code_str = 'hnode.Leaf(str(%s), color_e.OtherConst)' % var_name
|
| 134 |
|
| 135 | elif type_name == 'BigInt':
|
| 136 | code_str = 'hnode.Leaf(mops.ToStr(%s), color_e.OtherConst)' % var_name
|
| 137 |
|
| 138 | elif type_name == 'float':
|
| 139 | code_str = 'hnode.Leaf(str(%s), color_e.OtherConst)' % var_name
|
| 140 |
|
| 141 | elif type_name == 'string':
|
| 142 | code_str = 'NewLeaf(%s, color_e.StringConst)' % var_name
|
| 143 |
|
| 144 | elif type_name == 'any': # TODO: Remove this. Used for value.Obj().
|
| 145 | code_str = 'hnode.External(%s)' % var_name
|
| 146 |
|
| 147 | elif type_name == 'id': # was meta.UserType
|
| 148 | # This assumes it's Id, which is a simple SumType. TODO: Remove this.
|
| 149 | code_str = 'hnode.Leaf(Id_str(%s), color_e.UserType)' % var_name
|
| 150 |
|
| 151 | elif typ.resolved and isinstance(typ.resolved, ast.SimpleSum):
|
| 152 | code_str = 'hnode.Leaf(%s_str(%s), color_e.TypeName)' % (type_name,
|
| 153 | var_name)
|
| 154 |
|
| 155 | else:
|
| 156 | code_str = '%s.%s(trav=trav)' % (var_name, abbrev)
|
| 157 | none_guard = True
|
| 158 |
|
| 159 | else:
|
| 160 | raise AssertionError()
|
| 161 |
|
| 162 | return code_str, none_guard
|
| 163 |
|
| 164 |
|
| 165 | class GenMyPyVisitor(visitor.AsdlVisitor):
|
| 166 | """Generate Python code with MyPy type annotations."""
|
| 167 |
|
| 168 | def __init__(self,
|
| 169 | f,
|
| 170 | abbrev_mod_entries=None,
|
| 171 | pretty_print_methods=True,
|
| 172 | py_init_n=False,
|
| 173 | simple_int_sums=None):
|
| 174 |
|
| 175 | visitor.AsdlVisitor.__init__(self, f)
|
| 176 | self.abbrev_mod_entries = abbrev_mod_entries or []
|
| 177 | self.pretty_print_methods = pretty_print_methods
|
| 178 | self.py_init_n = py_init_n
|
| 179 |
|
| 180 | # For Id to use different code gen. It's used like an integer, not just
|
| 181 | # like an enum.
|
| 182 | self.simple_int_sums = simple_int_sums or []
|
| 183 |
|
| 184 | self._shared_type_tags = {}
|
| 185 | self._product_counter = 64 # matches asdl/gen_cpp.py
|
| 186 |
|
| 187 | self._products = []
|
| 188 | self._product_bases = defaultdict(list)
|
| 189 |
|
| 190 | def _EmitDict(self, name, d, depth):
|
| 191 | self.Emit('_%s_str = {' % name, depth)
|
| 192 | for k in sorted(d):
|
| 193 | self.Emit('%d: %r,' % (k, d[k]), depth + 1)
|
| 194 | self.Emit('}', depth)
|
| 195 | self.Emit('', depth)
|
| 196 |
|
| 197 | def VisitSimpleSum(self, sum, sum_name, depth):
|
| 198 | int_to_str = {}
|
| 199 | variants = []
|
| 200 | for i, variant in enumerate(sum.types):
|
| 201 | tag_num = i + 1
|
| 202 | tag_str = '%s.%s' % (sum_name, variant.name)
|
| 203 | int_to_str[tag_num] = tag_str
|
| 204 | variants.append((variant, tag_num))
|
| 205 |
|
| 206 | add_suffix = not ('no_namespace_suffix' in sum.generate)
|
| 207 | gen_integers = 'integers' in sum.generate or 'uint16' in sum.generate
|
| 208 |
|
| 209 | if gen_integers:
|
| 210 | self.Emit('%s_t = int # type alias for integer' % sum_name)
|
| 211 | self.Emit('')
|
| 212 |
|
| 213 | i_name = ('%s_i' % sum_name) if add_suffix else sum_name
|
| 214 |
|
| 215 | self.Emit('class %s(object):' % i_name, depth)
|
| 216 |
|
| 217 | for variant, tag_num in variants:
|
| 218 | line = ' %s = %d' % (variant.name, tag_num)
|
| 219 | self.Emit(line, depth)
|
| 220 |
|
| 221 | # Help in sizing array. Note that we're 1-based.
|
| 222 | line = ' %s = %d' % ('ARRAY_SIZE', len(variants) + 1)
|
| 223 | self.Emit(line, depth)
|
| 224 |
|
| 225 | else:
|
| 226 | # First emit a type
|
| 227 | self.Emit('class %s_t(pybase.SimpleObj):' % sum_name, depth)
|
| 228 | self.Emit(' pass', depth)
|
| 229 | self.Emit('', depth)
|
| 230 |
|
| 231 | # Now emit a namespace
|
| 232 | e_name = ('%s_e' % sum_name) if add_suffix else sum_name
|
| 233 | self.Emit('class %s(object):' % e_name, depth)
|
| 234 |
|
| 235 | for variant, tag_num in variants:
|
| 236 | line = ' %s = %s_t(%d)' % (variant.name, sum_name, tag_num)
|
| 237 | self.Emit(line, depth)
|
| 238 |
|
| 239 | self.Emit('', depth)
|
| 240 |
|
| 241 | self._EmitDict(sum_name, int_to_str, depth)
|
| 242 |
|
| 243 | self.Emit('def %s_str(val):' % sum_name, depth)
|
| 244 | self.Emit(' # type: (%s_t) -> str' % sum_name, depth)
|
| 245 | self.Emit(' return _%s_str[val]' % sum_name, depth)
|
| 246 | self.Emit('', depth)
|
| 247 |
|
| 248 | def _EmitCodeForField(self, abbrev, field, counter):
|
| 249 | """Generate code that returns an hnode for a field."""
|
| 250 | out_val_name = 'x%d' % counter
|
| 251 |
|
| 252 | if field.typ.IsList():
|
| 253 | iter_name = 'i%d' % counter
|
| 254 |
|
| 255 | typ = field.typ
|
| 256 | if typ.type_name == 'Optional': # descend one level
|
| 257 | typ = typ.children[0]
|
| 258 | item_type = typ.children[0]
|
| 259 |
|
| 260 | self.Emit(' if self.%s is not None: # List' % field.name)
|
| 261 | self.Emit(' %s = hnode.Array([])' % out_val_name)
|
| 262 | self.Emit(' for %s in self.%s:' % (iter_name, field.name))
|
| 263 | child_code_str, none_guard = _HNodeExpr(abbrev, item_type,
|
| 264 | iter_name)
|
| 265 |
|
| 266 | if none_guard: # e.g. for List[Optional[value_t]]
|
| 267 | # TODO: could consolidate with asdl/runtime.py NewLeaf(), which
|
| 268 | # also uses _ to mean None/nullptr
|
| 269 | self.Emit(
|
| 270 | ' h = (hnode.Leaf("_", color_e.OtherConst) if %s is None else %s)'
|
| 271 | % (iter_name, child_code_str))
|
| 272 | self.Emit(' %s.children.append(h)' % out_val_name)
|
| 273 | else:
|
| 274 | self.Emit(' %s.children.append(%s)' %
|
| 275 | (out_val_name, child_code_str))
|
| 276 |
|
| 277 | self.Emit(' L.append(Field(%r, %s))' %
|
| 278 | (field.name, out_val_name))
|
| 279 |
|
| 280 | elif field.typ.IsDict():
|
| 281 | k = 'k%d' % counter
|
| 282 | v = 'v%d' % counter
|
| 283 |
|
| 284 | typ = field.typ
|
| 285 | if typ.type_name == 'Optional': # descend one level
|
| 286 | typ = typ.children[0]
|
| 287 |
|
| 288 | k_typ = typ.children[0]
|
| 289 | v_typ = typ.children[1]
|
| 290 |
|
| 291 | k_code_str, _ = _HNodeExpr(abbrev, k_typ, k)
|
| 292 | v_code_str, _ = _HNodeExpr(abbrev, v_typ, v)
|
| 293 |
|
| 294 | self.Emit(' if self.%s is not None: # Dict' % field.name)
|
| 295 | self.Emit(' m = hnode.Leaf("Dict", color_e.OtherConst)')
|
| 296 | self.Emit(' %s = hnode.Array([m])' % out_val_name)
|
| 297 | self.Emit(' for %s, %s in self.%s.iteritems():' %
|
| 298 | (k, v, field.name))
|
| 299 | self.Emit(' %s.children.append(%s)' %
|
| 300 | (out_val_name, k_code_str))
|
| 301 | self.Emit(' %s.children.append(%s)' %
|
| 302 | (out_val_name, v_code_str))
|
| 303 | self.Emit(' L.append(Field(%r, %s))' %
|
| 304 | (field.name, out_val_name))
|
| 305 |
|
| 306 | elif field.typ.IsOptional():
|
| 307 | typ = field.typ.children[0]
|
| 308 |
|
| 309 | self.Emit(' if self.%s is not None: # Optional' % field.name)
|
| 310 | child_code_str, _ = _HNodeExpr(abbrev, typ, 'self.%s' % field.name)
|
| 311 | self.Emit(' %s = %s' % (out_val_name, child_code_str))
|
| 312 | self.Emit(' L.append(Field(%r, %s))' %
|
| 313 | (field.name, out_val_name))
|
| 314 |
|
| 315 | else:
|
| 316 | var_name = 'self.%s' % field.name
|
| 317 | code_str, obj_none_guard = _HNodeExpr(abbrev, field.typ, var_name)
|
| 318 | depth = self.current_depth
|
| 319 | if obj_none_guard: # to satisfy MyPy type system
|
| 320 | self.Emit(' assert self.%s is not None' % field.name)
|
| 321 | self.Emit(' %s = %s' % (out_val_name, code_str), depth)
|
| 322 |
|
| 323 | self.Emit(' L.append(Field(%r, %s))' % (field.name, out_val_name),
|
| 324 | depth)
|
| 325 |
|
| 326 | def _GenClass(self,
|
| 327 | ast_node,
|
| 328 | class_name,
|
| 329 | base_classes,
|
| 330 | tag_num,
|
| 331 | class_ns=''):
|
| 332 | """Used for both Sum variants ("constructors") and Product types.
|
| 333 |
|
| 334 | Args:
|
| 335 | class_ns: for variants like value.Str
|
| 336 | """
|
| 337 | self.Emit('class %s(%s):' % (class_name, ', '.join(base_classes)))
|
| 338 | self.Emit(' _type_tag = %d' % tag_num)
|
| 339 |
|
| 340 | all_fields = ast_node.fields
|
| 341 |
|
| 342 | field_names = [f.name for f in all_fields]
|
| 343 |
|
| 344 | quoted_fields = repr(tuple(field_names))
|
| 345 | self.Emit(' __slots__ = %s' % quoted_fields)
|
| 346 | self.Emit('')
|
| 347 |
|
| 348 | #
|
| 349 | # __init__
|
| 350 | #
|
| 351 |
|
| 352 | args = [f.name for f in ast_node.fields]
|
| 353 |
|
| 354 | self.Emit(' def __init__(self, %s):' % ', '.join(args))
|
| 355 |
|
| 356 | arg_types = []
|
| 357 | default_vals = []
|
| 358 | for f in ast_node.fields:
|
| 359 | mypy_type = _MyPyType(f.typ)
|
| 360 | arg_types.append(mypy_type)
|
| 361 |
|
| 362 | d_str = _DefaultValue(f.typ, mypy_type)
|
| 363 | default_vals.append(d_str)
|
| 364 |
|
| 365 | self.Emit(' # type: (%s) -> None' % ', '.join(arg_types),
|
| 366 | reflow=False)
|
| 367 |
|
| 368 | if not all_fields:
|
| 369 | self.Emit(' pass') # for types like NoOp
|
| 370 |
|
| 371 | for f in ast_node.fields:
|
| 372 | # don't wrap the type comment
|
| 373 | self.Emit(' self.%s = %s' % (f.name, f.name), reflow=False)
|
| 374 |
|
| 375 | self.Emit('')
|
| 376 |
|
| 377 | pretty_cls_name = '%s%s' % (class_ns, class_name)
|
| 378 |
|
| 379 | if len(all_fields) and not self.py_init_n:
|
| 380 | self.Emit(' @staticmethod')
|
| 381 | self.Emit(' def CreateNull(alloc_lists=False):')
|
| 382 | self.Emit(' # type: () -> %s%s' % (class_ns, class_name))
|
| 383 | self.Emit(' return %s%s(%s)' %
|
| 384 | (class_ns, class_name, ', '.join(default_vals)),
|
| 385 | reflow=False)
|
| 386 | self.Emit('')
|
| 387 |
|
| 388 | if not self.pretty_print_methods:
|
| 389 | return
|
| 390 |
|
| 391 | #
|
| 392 | # PrettyTree
|
| 393 | #
|
| 394 |
|
| 395 | self.Emit(' def PrettyTree(self, trav=None):')
|
| 396 | self.Emit(' # type: (Optional[TraversalState]) -> hnode_t')
|
| 397 | self.Emit(' trav = trav or TraversalState()')
|
| 398 | self.Emit(' heap_id = id(self)')
|
| 399 | self.Emit(' if heap_id in trav.seen:')
|
| 400 | # cut off recursion
|
| 401 | self.Emit(' return hnode.AlreadySeen(heap_id)')
|
| 402 | self.Emit(' trav.seen[heap_id] = True')
|
| 403 |
|
| 404 | self.Emit(' out_node = NewRecord(%r)' % pretty_cls_name)
|
| 405 | self.Emit(' L = out_node.fields')
|
| 406 | self.Emit('')
|
| 407 |
|
| 408 | # Use the runtime type to be more like asdl/format.py
|
| 409 | for local_id, field in enumerate(all_fields):
|
| 410 | #log('%s :: %s', field_name, field_desc)
|
| 411 | self.Indent()
|
| 412 | self._EmitCodeForField('PrettyTree', field, local_id)
|
| 413 | self.Dedent()
|
| 414 | self.Emit('')
|
| 415 | self.Emit(' return out_node')
|
| 416 | self.Emit('')
|
| 417 |
|
| 418 | #
|
| 419 | # _AbbreviatedTree
|
| 420 | #
|
| 421 |
|
| 422 | self.Emit(' def _AbbreviatedTree(self, trav=None):')
|
| 423 | self.Emit(' # type: (Optional[TraversalState]) -> hnode_t')
|
| 424 | self.Emit(' trav = trav or TraversalState()')
|
| 425 | self.Emit(' heap_id = id(self)')
|
| 426 | self.Emit(' if heap_id in trav.seen:')
|
| 427 | # cut off recursion
|
| 428 | self.Emit(' return hnode.AlreadySeen(heap_id)')
|
| 429 | self.Emit(' trav.seen[heap_id] = True')
|
| 430 | self.Emit(' out_node = NewRecord(%r)' % pretty_cls_name)
|
| 431 | self.Emit(' L = out_node.fields')
|
| 432 |
|
| 433 | for local_id, field in enumerate(ast_node.fields):
|
| 434 | self.Indent()
|
| 435 | self._EmitCodeForField('AbbreviatedTree', field, local_id)
|
| 436 | self.Dedent()
|
| 437 | self.Emit('')
|
| 438 | self.Emit(' return out_node')
|
| 439 | self.Emit('')
|
| 440 |
|
| 441 | self.Emit(' def AbbreviatedTree(self, trav=None):')
|
| 442 | self.Emit(' # type: (Optional[TraversalState]) -> hnode_t')
|
| 443 | abbrev_name = '_%s' % class_name
|
| 444 | if abbrev_name in self.abbrev_mod_entries:
|
| 445 | self.Emit(' p = %s(self)' % abbrev_name)
|
| 446 | # If the user function didn't return anything, fall back.
|
| 447 | self.Emit(
|
| 448 | ' return p if p else self._AbbreviatedTree(trav=trav)')
|
| 449 | else:
|
| 450 | self.Emit(' return self._AbbreviatedTree(trav=trav)')
|
| 451 | self.Emit('')
|
| 452 |
|
| 453 | def VisitCompoundSum(self, sum, sum_name, depth):
|
| 454 | """Note that the following is_simple:
|
| 455 |
|
| 456 | cflow = Break | Continue
|
| 457 |
|
| 458 | But this is compound:
|
| 459 |
|
| 460 | cflow = Break | Continue | Return(int val)
|
| 461 |
|
| 462 | The generated code changes depending on which one it is.
|
| 463 | """
|
| 464 | #log('%d variants in %s', len(sum.types), sum_name)
|
| 465 |
|
| 466 | # We emit THREE Python types for each meta.CompoundType:
|
| 467 | #
|
| 468 | # 1. enum for tag (cflow_e)
|
| 469 | # 2. base class for inheritance (cflow_t)
|
| 470 | # 3. namespace for classes (cflow) -- TODO: Get rid of this one.
|
| 471 | #
|
| 472 | # Should code use cflow_e.tag or isinstance()?
|
| 473 | # isinstance() is better for MyPy I think. But tag is better for C++.
|
| 474 | # int tag = static_cast<cflow>(node).tag;
|
| 475 |
|
| 476 | int_to_str = {}
|
| 477 |
|
| 478 | # enum for the tag
|
| 479 | self.Emit('class %s_e(object):' % sum_name, depth)
|
| 480 |
|
| 481 | for i, variant in enumerate(sum.types):
|
| 482 | if variant.shared_type:
|
| 483 | tag_num = self._shared_type_tags[variant.shared_type]
|
| 484 | # e.g. DoubleQuoted may have base types expr_t, word_part_t
|
| 485 | base_class = sum_name + '_t'
|
| 486 | bases = self._product_bases[variant.shared_type]
|
| 487 | if base_class in bases:
|
| 488 | raise RuntimeError(
|
| 489 | "Two tags in sum %r refer to product type %r" %
|
| 490 | (sum_name, variant.shared_type))
|
| 491 |
|
| 492 | else:
|
| 493 | bases.append(base_class)
|
| 494 | else:
|
| 495 | tag_num = i + 1
|
| 496 | self.Emit(' %s = %d' % (variant.name, tag_num), depth)
|
| 497 | int_to_str[tag_num] = variant.name
|
| 498 | self.Emit('', depth)
|
| 499 |
|
| 500 | self._EmitDict(sum_name, int_to_str, depth)
|
| 501 |
|
| 502 | self.Emit('def %s_str(tag, dot=True):' % sum_name, depth)
|
| 503 | self.Emit(' # type: (int, bool) -> str', depth)
|
| 504 | self.Emit(' v = _%s_str[tag]' % sum_name, depth)
|
| 505 | self.Emit(' if dot:', depth)
|
| 506 | self.Emit(' return "%s.%%s" %% v' % sum_name, depth)
|
| 507 | self.Emit(' else:', depth)
|
| 508 | self.Emit(' return v', depth)
|
| 509 | self.Emit('', depth)
|
| 510 |
|
| 511 | # the base class, e.g. 'oil_cmd'
|
| 512 | self.Emit('class %s_t(pybase.CompoundObj):' % sum_name, depth)
|
| 513 | self.Indent()
|
| 514 | depth = self.current_depth
|
| 515 |
|
| 516 | # To imitate C++ API
|
| 517 | self.Emit('def tag(self):')
|
| 518 | self.Emit(' # type: () -> int')
|
| 519 | self.Emit(' return self._type_tag')
|
| 520 |
|
| 521 | # This is what we would do in C++, but we don't need it in Python because
|
| 522 | # every function is virtual.
|
| 523 | if 0:
|
| 524 | #if self.pretty_print_methods:
|
| 525 | for abbrev in 'PrettyTree', '_AbbreviatedTree', 'AbbreviatedTree':
|
| 526 | self.Emit('')
|
| 527 | self.Emit('def %s(self):' % abbrev, depth)
|
| 528 | self.Emit(' # type: () -> hnode_t', depth)
|
| 529 | self.Indent()
|
| 530 | depth = self.current_depth
|
| 531 | self.Emit('UP_self = self', depth)
|
| 532 | self.Emit('', depth)
|
| 533 |
|
| 534 | for variant in sum.types:
|
| 535 | if variant.shared_type:
|
| 536 | subtype_name = variant.shared_type
|
| 537 | else:
|
| 538 | subtype_name = '%s__%s' % (sum_name, variant.name)
|
| 539 |
|
| 540 | self.Emit(
|
| 541 | 'if self.tag() == %s_e.%s:' % (sum_name, variant.name),
|
| 542 | depth)
|
| 543 | self.Emit(' self = cast(%s, UP_self)' % subtype_name,
|
| 544 | depth)
|
| 545 | self.Emit(' return self.%s()' % abbrev, depth)
|
| 546 |
|
| 547 | self.Emit('raise AssertionError()', depth)
|
| 548 |
|
| 549 | self.Dedent()
|
| 550 | depth = self.current_depth
|
| 551 | else:
|
| 552 | # Otherwise it's empty
|
| 553 | self.Emit('pass', depth)
|
| 554 |
|
| 555 | self.Dedent()
|
| 556 | depth = self.current_depth
|
| 557 | self.Emit('')
|
| 558 |
|
| 559 | # Declare any zero argument singleton classes outside of the main
|
| 560 | # "namespace" class.
|
| 561 | for i, variant in enumerate(sum.types):
|
| 562 | if variant.shared_type:
|
| 563 | continue # Don't generate a class for shared types.
|
| 564 | if len(variant.fields) == 0:
|
| 565 | # We must use the old-style naming here, ie. command__NoOp, in order
|
| 566 | # to support zero field variants as constants.
|
| 567 | class_name = '%s__%s' % (sum_name, variant.name)
|
| 568 | self._GenClass(variant, class_name, (sum_name + '_t', ), i + 1)
|
| 569 |
|
| 570 | # Class that's just a NAMESPACE, e.g. for value.Str
|
| 571 | self.Emit('class %s(object):' % sum_name, depth)
|
| 572 |
|
| 573 | self.Indent()
|
| 574 |
|
| 575 | for i, variant in enumerate(sum.types):
|
| 576 | if variant.shared_type:
|
| 577 | continue
|
| 578 |
|
| 579 | if len(variant.fields) == 0:
|
| 580 | self.Emit('%s = %s__%s()' %
|
| 581 | (variant.name, sum_name, variant.name))
|
| 582 | self.Emit('')
|
| 583 | else:
|
| 584 | # Use fully-qualified name, so we can have osh_cmd.Simple and
|
| 585 | # oil_cmd.Simple.
|
| 586 | fq_name = variant.name
|
| 587 | self._GenClass(variant,
|
| 588 | fq_name, (sum_name + '_t', ),
|
| 589 | i + 1,
|
| 590 | class_ns=sum_name + '.')
|
| 591 | self.Emit(' pass', depth) # in case every variant is first class
|
| 592 |
|
| 593 | self.Dedent()
|
| 594 | self.Emit('')
|
| 595 |
|
| 596 | def VisitProduct(self, product, name, depth):
|
| 597 | self._shared_type_tags[name] = self._product_counter
|
| 598 | # Create a tuple of _GenClass args to create LAST. They may inherit from
|
| 599 | # sum types that have yet to be defined.
|
| 600 | self._products.append((product, name, depth, self._product_counter))
|
| 601 | self._product_counter += 1
|
| 602 |
|
| 603 | def EmitFooter(self):
|
| 604 | # Now generate all the product types we deferred.
|
| 605 | for args in self._products:
|
| 606 | ast_node, name, depth, tag_num = args
|
| 607 | # Figure out base classes AFTERWARD.
|
| 608 | bases = self._product_bases[name]
|
| 609 | if not bases:
|
| 610 | bases = ('pybase.CompoundObj', )
|
| 611 | self._GenClass(ast_node, name, bases, tag_num)
|