| 1 | #!/usr/bin/env python2
|
| 2 | """gen_python.py: Generate Python code from an ASDL schema."""
|
| 3 | from __future__ import print_function
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| 4 |
|
| 5 | from collections import defaultdict
|
| 6 |
|
| 7 | from asdl import ast
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| 8 | from asdl import visitor
|
| 9 | from asdl.util import log
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| 10 |
|
| 11 | from typing import List, Dict, Optional, Union, Tuple, IO, Any, cast
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| 12 |
|
| 13 | _ = log # shut up lint
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| 14 |
|
| 15 | _PRIMITIVES = {
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| 16 | 'string': 'str',
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| 17 | 'int': 'int',
|
| 18 | 'uint16': 'int',
|
| 19 | 'BigInt': 'mops.BigInt',
|
| 20 | 'float': 'float',
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| 21 | 'bool': 'bool',
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| 22 | 'any': 'Any',
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| 23 | }
|
| 24 |
|
| 25 |
|
| 26 | def _MyPyType(typ):
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| 27 | # type: (ast.type_expr_t) -> str
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| 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])
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| 38 |
|
| 39 | if typ.type_name == 'Optional':
|
| 40 | return 'Optional[%s]' % _MyPyType(typ.children[0])
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| 41 |
|
| 42 | raise AssertionError()
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| 43 |
|
| 44 | elif isinstance(typ, ast.NamedType):
|
| 45 | if typ.resolved:
|
| 46 | if isinstance(typ.resolved, ast.Sum): # includes SimpleSum
|
| 47 | return '%s_t' % typ.name
|
| 48 | if isinstance(typ.resolved, ast.Product):
|
| 49 | return typ.name
|
| 50 | if isinstance(typ.resolved, ast.Use):
|
| 51 | py_name, _ = ast.TypeNameHeuristic(typ.name)
|
| 52 | return py_name
|
| 53 | if isinstance(typ.resolved, ast.Extern):
|
| 54 | r = typ.resolved
|
| 55 | type_name = r.names[-1]
|
| 56 | py_module = r.names[-2]
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| 57 | return '%s.%s' % (py_module, type_name)
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| 58 | raise AssertionError(typ)
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| 59 |
|
| 60 | return _PRIMITIVES[typ.name]
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| 61 |
|
| 62 | else:
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| 63 | raise AssertionError()
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| 64 |
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| 65 |
|
| 66 | def _CastedNull(mypy_type):
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| 67 | # type: (str) -> str
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| 68 | return "cast('%s', None)" % mypy_type
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| 69 |
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| 70 |
|
| 71 | def _DefaultValue(typ, mypy_type):
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| 72 | # type: (ast.type_expr_t, str) -> str
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| 73 | """Values that the static CreateNull() constructor passes.
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| 74 |
|
| 75 | mypy_type is used to cast None, to maintain mypy --strict for ASDL.
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| 76 |
|
| 77 | We circumvent the type system on CreateNull(). Then the user is
|
| 78 | responsible for filling in all the fields. If they do so, we can
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| 79 | rely on it when reading fields at runtime.
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| 80 | """
|
| 81 | if isinstance(typ, ast.ParameterizedType):
|
| 82 | type_name = typ.type_name
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| 83 |
|
| 84 | if type_name == 'Optional':
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| 85 | return _CastedNull(mypy_type)
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| 86 |
|
| 87 | if type_name == 'List':
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| 88 | return "[] if alloc_lists else cast('%s', None)" % mypy_type
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| 89 |
|
| 90 | if type_name == 'Dict': # TODO: can respect alloc_dicts=True
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| 91 | return _CastedNull(mypy_type)
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| 92 |
|
| 93 | raise AssertionError(type_name)
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| 94 |
|
| 95 | if isinstance(typ, ast.NamedType):
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| 96 | type_name = typ.name
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| 97 |
|
| 98 | if type_name == 'id': # hard-coded HACK
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| 99 | return '-1'
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| 100 |
|
| 101 | if type_name == 'int':
|
| 102 | return '-1'
|
| 103 |
|
| 104 | if type_name == 'BigInt':
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| 105 | return 'mops.BigInt(-1)'
|
| 106 |
|
| 107 | if type_name == 'bool':
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| 108 | return 'False'
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| 109 |
|
| 110 | if type_name == 'float':
|
| 111 | return '0.0' # or should it be NaN?
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| 112 |
|
| 113 | if type_name == 'string':
|
| 114 | return "''"
|
| 115 |
|
| 116 | if isinstance(typ.resolved, ast.SimpleSum):
|
| 117 | sum_type = typ.resolved
|
| 118 | # Just make it the first variant. We could define "Undef" for
|
| 119 | # each enum, but it doesn't seem worth it.
|
| 120 | return '%s_e.%s' % (type_name, sum_type.types[0].name)
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| 121 |
|
| 122 | # CompoundSum or Product type
|
| 123 | return _CastedNull(mypy_type)
|
| 124 |
|
| 125 | else:
|
| 126 | raise AssertionError()
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| 127 |
|
| 128 |
|
| 129 | def _HNodeExpr(typ, var_name):
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| 130 | # type: (ast.type_expr_t, str) -> Tuple[str, bool]
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| 131 | none_guard = False
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| 132 |
|
| 133 | if ast.IsOptional(typ):
|
| 134 | narrow = cast(ast.ParameterizedType, typ)
|
| 135 | typ = narrow.children[0] # descend one level
|
| 136 |
|
| 137 | if isinstance(typ, ast.ParameterizedType):
|
| 138 | code_str = '%s.PrettyTree()' % var_name
|
| 139 | none_guard = True
|
| 140 |
|
| 141 | elif isinstance(typ, ast.NamedType):
|
| 142 | type_name = typ.name
|
| 143 |
|
| 144 | if type_name == 'bool':
|
| 145 | code_str = "hnode.Leaf('T' if %s else 'F', color_e.OtherConst)" % var_name
|
| 146 |
|
| 147 | elif type_name in ('int', 'uint16'):
|
| 148 | code_str = 'hnode.Leaf(str(%s), color_e.OtherConst)' % var_name
|
| 149 |
|
| 150 | elif type_name == 'BigInt':
|
| 151 | code_str = 'hnode.Leaf(mops.ToStr(%s), color_e.OtherConst)' % var_name
|
| 152 |
|
| 153 | elif type_name == 'float':
|
| 154 | code_str = 'hnode.Leaf(str(%s), color_e.OtherConst)' % var_name
|
| 155 |
|
| 156 | elif type_name == 'string':
|
| 157 | code_str = 'NewLeaf(%s, color_e.StringConst)' % var_name
|
| 158 |
|
| 159 | elif type_name == 'any':
|
| 160 | code_str = 'NewLeaf(str(%s), color_e.External)' % var_name
|
| 161 |
|
| 162 | elif type_name == 'id': # was meta.UserType
|
| 163 | # This assumes it's Id, which is a simple SumType. TODO: Remove this.
|
| 164 | code_str = 'hnode.Leaf(Id_str(%s, dot=False), color_e.UserType)' % var_name
|
| 165 |
|
| 166 | elif typ.resolved and isinstance(typ.resolved, ast.SimpleSum):
|
| 167 | code_str = 'hnode.Leaf(%s_str(%s), color_e.TypeName)' % (type_name,
|
| 168 | var_name)
|
| 169 |
|
| 170 | else:
|
| 171 | code_str = '%s.PrettyTree(do_abbrev, trav=trav)' % var_name
|
| 172 | none_guard = True
|
| 173 |
|
| 174 | else:
|
| 175 | raise AssertionError()
|
| 176 |
|
| 177 | return code_str, none_guard
|
| 178 |
|
| 179 |
|
| 180 | class GenMyPyVisitor(visitor.AsdlVisitor):
|
| 181 | """Generate Python code with MyPy type annotations."""
|
| 182 |
|
| 183 | def __init__(
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| 184 | self,
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| 185 | f, # type: IO[bytes]
|
| 186 | abbrev_mod_entries=None, # type: Optional[List[str]]
|
| 187 | pretty_print_methods=True, # type: bool
|
| 188 | py_init_n=False, # type: bool
|
| 189 | ):
|
| 190 | # type: (...) -> None
|
| 191 |
|
| 192 | visitor.AsdlVisitor.__init__(self, f)
|
| 193 | self.abbrev_mod_entries = abbrev_mod_entries or []
|
| 194 | self.pretty_print_methods = pretty_print_methods
|
| 195 | self.py_init_n = py_init_n
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| 196 |
|
| 197 | self._shared_type_tags = {} # type: Dict[str, int]
|
| 198 | self._product_counter = 64 # matches asdl/gen_cpp.py
|
| 199 |
|
| 200 | self._products = [] # type: List[Any]
|
| 201 | self._base_classes = defaultdict(list) # type: Dict[str, List[str]]
|
| 202 |
|
| 203 | self._subtypes = [] # type: List[Any]
|
| 204 |
|
| 205 | def _EmitDict(self, name, d, depth):
|
| 206 | # type: (str, Dict[int, str], int) -> None
|
| 207 | self.Emit('_%s_str = {' % name, depth)
|
| 208 | for k in sorted(d):
|
| 209 | self.Emit('%d: %r,' % (k, d[k]), depth + 1)
|
| 210 | self.Emit('}', depth)
|
| 211 | self.Emit('', depth)
|
| 212 |
|
| 213 | def VisitSimpleSum(self, sum, sum_name, depth):
|
| 214 | # type: (ast.SimpleSum, str, int) -> None
|
| 215 | int_to_str = {}
|
| 216 | variants = []
|
| 217 | for i, variant in enumerate(sum.types):
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| 218 | tag_num = i + 1
|
| 219 | int_to_str[tag_num] = variant.name
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| 220 | variants.append((variant, tag_num))
|
| 221 |
|
| 222 | add_suffix = not ('no_namespace_suffix' in sum.generate)
|
| 223 | gen_integers = 'integers' in sum.generate or 'uint16' in sum.generate
|
| 224 |
|
| 225 | if gen_integers:
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| 226 | self.Emit('%s_t = int # type alias for integer' % sum_name)
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| 227 | self.Emit('')
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| 228 |
|
| 229 | i_name = ('%s_i' % sum_name) if add_suffix else sum_name
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| 230 |
|
| 231 | self.Emit('class %s(object):' % i_name, depth)
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| 232 |
|
| 233 | for variant, tag_num in variants:
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| 234 | line = ' %s = %d' % (variant.name, tag_num)
|
| 235 | self.Emit(line, depth)
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| 236 |
|
| 237 | # Help in sizing array. Note that we're 1-based.
|
| 238 | line = ' %s = %d' % ('ARRAY_SIZE', len(variants) + 1)
|
| 239 | self.Emit(line, depth)
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| 240 |
|
| 241 | else:
|
| 242 | # First emit a type
|
| 243 | self.Emit('class %s_t(pybase.SimpleObj):' % sum_name, depth)
|
| 244 | self.Emit(' pass', depth)
|
| 245 | self.Emit('', depth)
|
| 246 |
|
| 247 | # Now emit a namespace
|
| 248 | e_name = ('%s_e' % sum_name) if add_suffix else sum_name
|
| 249 | self.Emit('class %s(object):' % e_name, depth)
|
| 250 |
|
| 251 | for variant, tag_num in variants:
|
| 252 | line = ' %s = %s_t(%d)' % (variant.name, sum_name, tag_num)
|
| 253 | self.Emit(line, depth)
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| 254 |
|
| 255 | self.Emit('', depth)
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| 256 |
|
| 257 | self._EmitDict(sum_name, int_to_str, depth)
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| 258 |
|
| 259 | sum_name = ast.NameHack(sum_name)
|
| 260 |
|
| 261 | self.Emit('def %s_str(val, dot=True):' % sum_name, depth)
|
| 262 | self.Emit(' # type: (%s_t, bool) -> str' % sum_name, depth)
|
| 263 | self.Emit(' v = _%s_str[val]' % sum_name, depth)
|
| 264 | self.Emit(' if dot:', depth)
|
| 265 | self.Emit(' return "%s.%%s" %% v' % sum_name, depth)
|
| 266 | self.Emit(' else:', depth)
|
| 267 | self.Emit(' return v', depth)
|
| 268 | self.Emit('', depth)
|
| 269 |
|
| 270 | def _EmitCodeForField(self, field, counter):
|
| 271 | # type: (ast.Field, int) -> None
|
| 272 | """Generate code that returns an hnode for a field."""
|
| 273 | out_val_name = 'x%d' % counter
|
| 274 |
|
| 275 | if ast.IsList(field.typ):
|
| 276 | iter_name = 'i%d' % counter
|
| 277 |
|
| 278 | typ = field.typ
|
| 279 | if ast.IsOptional(typ): # descend one level
|
| 280 | typ = cast(ast.ParameterizedType, typ).children[0]
|
| 281 | item_type = cast(ast.ParameterizedType, typ).children[0]
|
| 282 |
|
| 283 | self.Emit(' if self.%s is not None: # List' % field.name)
|
| 284 | self.Emit(' %s = hnode.Array([])' % out_val_name)
|
| 285 | self.Emit(' for %s in self.%s:' % (iter_name, field.name))
|
| 286 | child_code_str, none_guard = _HNodeExpr(item_type, iter_name)
|
| 287 |
|
| 288 | if none_guard: # e.g. for List[Optional[value_t]]
|
| 289 | # TODO: could consolidate with asdl/runtime.py NewLeaf(), which
|
| 290 | # also uses _ to mean None/nullptr
|
| 291 | self.Emit(
|
| 292 | ' h = (hnode.Leaf("_", color_e.OtherConst) if %s is None else %s)'
|
| 293 | % (iter_name, child_code_str))
|
| 294 | self.Emit(' %s.children.append(h)' % out_val_name)
|
| 295 | else:
|
| 296 | self.Emit(' %s.children.append(%s)' %
|
| 297 | (out_val_name, child_code_str))
|
| 298 |
|
| 299 | self.Emit(' L.append(Field(%r, %s))' %
|
| 300 | (field.name, out_val_name))
|
| 301 |
|
| 302 | elif ast.IsDict(field.typ):
|
| 303 | k = 'k%d' % counter
|
| 304 | v = 'v%d' % counter
|
| 305 |
|
| 306 | typ = field.typ
|
| 307 | if ast.IsOptional(typ): # descend one level
|
| 308 | typ = cast(ast.ParameterizedType, typ).children[0]
|
| 309 |
|
| 310 | k_typ = cast(ast.ParameterizedType, typ).children[0]
|
| 311 | v_typ = cast(ast.ParameterizedType, typ).children[1]
|
| 312 |
|
| 313 | k_code_str, _ = _HNodeExpr(k_typ, k)
|
| 314 | v_code_str, _ = _HNodeExpr(v_typ, v)
|
| 315 |
|
| 316 | unnamed = 'unnamed%d' % counter
|
| 317 | self.Emit(' if self.%s is not None: # Dict' % field.name)
|
| 318 | self.Emit(' %s = [] # type: List[hnode_t]' % unnamed)
|
| 319 | self.Emit(' %s = hnode.Record("", "{", "}", [], %s)' %
|
| 320 | (out_val_name, unnamed))
|
| 321 | self.Emit(' for %s, %s in self.%s.iteritems():' %
|
| 322 | (k, v, field.name))
|
| 323 | self.Emit(' %s.append(%s)' % (unnamed, k_code_str))
|
| 324 | self.Emit(' %s.append(%s)' % (unnamed, v_code_str))
|
| 325 | self.Emit(' L.append(Field(%r, %s))' %
|
| 326 | (field.name, out_val_name))
|
| 327 |
|
| 328 | elif ast.IsOptional(field.typ):
|
| 329 | typ = cast(ast.ParameterizedType, field.typ).children[0]
|
| 330 |
|
| 331 | self.Emit(' if self.%s is not None: # Optional' % field.name)
|
| 332 | child_code_str, _ = _HNodeExpr(typ, 'self.%s' % field.name)
|
| 333 | self.Emit(' %s = %s' % (out_val_name, child_code_str))
|
| 334 | self.Emit(' L.append(Field(%r, %s))' %
|
| 335 | (field.name, out_val_name))
|
| 336 |
|
| 337 | else:
|
| 338 | var_name = 'self.%s' % field.name
|
| 339 | code_str, obj_none_guard = _HNodeExpr(field.typ, var_name)
|
| 340 | depth = self.current_depth
|
| 341 | if obj_none_guard: # to satisfy MyPy type system
|
| 342 | self.Emit(' assert self.%s is not None' % field.name)
|
| 343 | self.Emit(' %s = %s' % (out_val_name, code_str), depth)
|
| 344 |
|
| 345 | self.Emit(' L.append(Field(%r, %s))' % (field.name, out_val_name),
|
| 346 | depth)
|
| 347 |
|
| 348 | def _GenClassBegin(self, class_name, base_classes, tag_num):
|
| 349 | # type: (str, Union[List[str], Tuple[str]], int) -> None
|
| 350 | self.Emit('class %s(%s):' % (class_name, ', '.join(base_classes)))
|
| 351 | self.Emit(' _type_tag = %d' % tag_num)
|
| 352 |
|
| 353 | def _GenListSubclass(self, class_name, base_classes, tag_num, class_ns=''):
|
| 354 | # type: (str, List[str], int, str) -> None
|
| 355 | self._GenClassBegin(class_name, base_classes, tag_num)
|
| 356 |
|
| 357 | # TODO: Do something nicer
|
| 358 | base_class_str = [b for b in base_classes if b.startswith('List[')][0]
|
| 359 |
|
| 360 | # Needed for c = CompoundWord() to work
|
| 361 | # TODO: make it
|
| 362 | # c = CompoundWord.New()
|
| 363 | if 0:
|
| 364 | self.Emit(' def __init__(self, other=None):')
|
| 365 | self.Emit(' # type: (Optional[%s]) -> None' % base_class_str,
|
| 366 | reflow=False)
|
| 367 | self.Emit(' if other is not None:')
|
| 368 | self.Emit(' self.extend(other)')
|
| 369 | self.Emit('')
|
| 370 |
|
| 371 | # Use our own constructor
|
| 372 | self.Emit(' @staticmethod')
|
| 373 | self.Emit(' def New():')
|
| 374 | self.Emit(' # type: () -> %s' % class_name)
|
| 375 | self.Emit(' return %s()' % class_name)
|
| 376 | self.Emit('')
|
| 377 |
|
| 378 | self.Emit(' @staticmethod')
|
| 379 | self.Emit(' def Take(plain_list):')
|
| 380 | self.Emit(' # type: (%s) -> %s' % (base_class_str, class_name))
|
| 381 | self.Emit(' result = %s(plain_list)' % class_name)
|
| 382 | self.Emit(' del plain_list[:]')
|
| 383 | self.Emit(' return result')
|
| 384 | self.Emit('')
|
| 385 |
|
| 386 | if self.pretty_print_methods:
|
| 387 | self._EmitPrettyPrintMethodsForList(class_name)
|
| 388 |
|
| 389 | def _GenClass(
|
| 390 | self,
|
| 391 | fields, # type: List[ast.Field]
|
| 392 | class_name, # type: str
|
| 393 | base_classes, # type: Union[List[str], Tuple[str]]
|
| 394 | tag_num, # type: int
|
| 395 | class_ns='', # type: str
|
| 396 | ):
|
| 397 | # type: (...) -> None
|
| 398 | """Generate a typed Python class.
|
| 399 |
|
| 400 | Used for both Sum variants ("constructors") and Product types.
|
| 401 |
|
| 402 | Args:
|
| 403 | class_ns: for variants like value.Str
|
| 404 | """
|
| 405 | self._GenClassBegin(class_name, base_classes, tag_num)
|
| 406 |
|
| 407 | field_names = [f.name for f in fields]
|
| 408 |
|
| 409 | quoted_fields = repr(tuple(field_names))
|
| 410 | self.Emit(' __slots__ = %s' % quoted_fields)
|
| 411 | self.Emit('')
|
| 412 |
|
| 413 | #
|
| 414 | # __init__
|
| 415 | #
|
| 416 |
|
| 417 | args = [f.name for f in fields]
|
| 418 | arg_types = []
|
| 419 | default_vals = []
|
| 420 | for f in fields:
|
| 421 | mypy_type = _MyPyType(f.typ)
|
| 422 | arg_types.append(mypy_type)
|
| 423 |
|
| 424 | d_str = _DefaultValue(f.typ, mypy_type)
|
| 425 | default_vals.append(d_str)
|
| 426 |
|
| 427 | self.Emit(' def __init__(self, %s):' % ', '.join(args))
|
| 428 | self.Emit(' # type: (%s) -> None' % ', '.join(arg_types),
|
| 429 | reflow=False)
|
| 430 |
|
| 431 | if not fields:
|
| 432 | self.Emit(' pass') # for types like NoOp
|
| 433 |
|
| 434 | for f in fields:
|
| 435 | # don't wrap the type comment
|
| 436 | self.Emit(' self.%s = %s' % (f.name, f.name), reflow=False)
|
| 437 |
|
| 438 | self.Emit('')
|
| 439 |
|
| 440 | # CreateNull() - another way of initializing
|
| 441 | if len(fields) and not self.py_init_n:
|
| 442 | self.Emit(' @staticmethod')
|
| 443 | self.Emit(' def CreateNull(alloc_lists=False):')
|
| 444 | self.Emit(' # type: () -> %s%s' % (class_ns, class_name))
|
| 445 | self.Emit(' return %s%s(%s)' %
|
| 446 | (class_ns, class_name, ', '.join(default_vals)),
|
| 447 | reflow=False)
|
| 448 | self.Emit('')
|
| 449 |
|
| 450 | # PrettyTree()
|
| 451 | if self.pretty_print_methods:
|
| 452 | self._EmitPrettyPrintMethods(class_name, class_ns, fields)
|
| 453 |
|
| 454 | def _EmitPrettyBegin(self):
|
| 455 | # type: () -> None
|
| 456 | self.Emit(' def PrettyTree(self, do_abbrev, trav=None):')
|
| 457 | self.Emit(' # type: (bool, Optional[TraversalState]) -> hnode_t')
|
| 458 | self.Emit(' trav = trav or TraversalState()')
|
| 459 | self.Emit(' heap_id = id(self)')
|
| 460 | self.Emit(' if heap_id in trav.seen:')
|
| 461 | # cut off recursion
|
| 462 | self.Emit(' return hnode.AlreadySeen(heap_id)')
|
| 463 | self.Emit(' trav.seen[heap_id] = True')
|
| 464 |
|
| 465 | def _EmitPrettyPrintMethodsForList(self, class_name):
|
| 466 | # type: (str) -> None
|
| 467 | self._EmitPrettyBegin()
|
| 468 | self.Emit(' h = runtime.NewRecord(%r)' % class_name)
|
| 469 | self.Emit(
|
| 470 | ' h.unnamed_fields = [c.PrettyTree(do_abbrev) for c in self]')
|
| 471 | self.Emit(' return h')
|
| 472 | self.Emit('')
|
| 473 |
|
| 474 | def _EmitPrettyPrintMethods(self, class_name, class_ns, fields):
|
| 475 | # type: (str, str, List[ast.Field]) -> None
|
| 476 | if len(fields) == 0:
|
| 477 | # value__Stdin -> value.Stdin (defined at top level)
|
| 478 | pretty_cls_name = class_name.replace('__', '.')
|
| 479 | else:
|
| 480 | # value.Str (defined inside the 'class value') namespace
|
| 481 | pretty_cls_name = '%s%s' % (class_ns, class_name)
|
| 482 |
|
| 483 | # def PrettyTree(...):
|
| 484 |
|
| 485 | self._EmitPrettyBegin()
|
| 486 | self.Emit('')
|
| 487 |
|
| 488 | if class_ns:
|
| 489 | # e.g. _command__Simple
|
| 490 | assert class_ns.endswith('.')
|
| 491 | abbrev_name = '_%s__%s' % (class_ns[:-1], class_name)
|
| 492 | else:
|
| 493 | # e.g. _Token
|
| 494 | abbrev_name = '_%s' % class_name
|
| 495 |
|
| 496 | if abbrev_name in self.abbrev_mod_entries:
|
| 497 | self.Emit(' if do_abbrev:')
|
| 498 | self.Emit(' p = %s(self)' % abbrev_name)
|
| 499 | self.Emit(' if p:')
|
| 500 | self.Emit(' return p')
|
| 501 | self.Emit('')
|
| 502 |
|
| 503 | self.Emit(' out_node = NewRecord(%r)' % pretty_cls_name)
|
| 504 | self.Emit(' L = out_node.fields')
|
| 505 | self.Emit('')
|
| 506 |
|
| 507 | # Use the runtime type to be more like asdl/format.py
|
| 508 | for local_id, field in enumerate(fields):
|
| 509 | #log('%s :: %s', field_name, field_desc)
|
| 510 | self.Indent()
|
| 511 | self._EmitCodeForField(field, local_id)
|
| 512 | self.Dedent()
|
| 513 | self.Emit('')
|
| 514 | self.Emit(' return out_node')
|
| 515 | self.Emit('')
|
| 516 |
|
| 517 | def VisitCompoundSum(self, sum, sum_name, depth):
|
| 518 | # type: (ast.Sum, str, int) -> None
|
| 519 | """Note that the following is_simple:
|
| 520 |
|
| 521 | cflow = Break | Continue
|
| 522 |
|
| 523 | But this is compound:
|
| 524 |
|
| 525 | cflow = Break | Continue | Return(int val)
|
| 526 |
|
| 527 | The generated code changes depending on which one it is.
|
| 528 | """
|
| 529 | #log('%d variants in %s', len(sum.types), sum_name)
|
| 530 |
|
| 531 | # We emit THREE Python types for each meta.CompoundType:
|
| 532 | #
|
| 533 | # 1. enum for tag (cflow_e)
|
| 534 | # 2. base class for inheritance (cflow_t)
|
| 535 | # 3. namespace for classes (cflow) -- TODO: Get rid of this one.
|
| 536 | #
|
| 537 | # Should code use cflow_e.tag or isinstance()?
|
| 538 | # isinstance() is better for MyPy I think. But tag is better for C++.
|
| 539 | # int tag = static_cast<cflow>(node).tag;
|
| 540 |
|
| 541 | int_to_str = {}
|
| 542 |
|
| 543 | # enum for the tag
|
| 544 | self.Emit('class %s_e(object):' % sum_name, depth)
|
| 545 |
|
| 546 | for i, variant in enumerate(sum.types):
|
| 547 | if variant.shared_type:
|
| 548 | tag_num = self._shared_type_tags[variant.shared_type]
|
| 549 | # e.g. DoubleQuoted may have base types expr_t, word_part_t
|
| 550 | base_class = sum_name + '_t'
|
| 551 | bases = self._base_classes[variant.shared_type]
|
| 552 | if base_class in bases:
|
| 553 | raise RuntimeError(
|
| 554 | "Two tags in sum %r refer to product type %r" %
|
| 555 | (sum_name, variant.shared_type))
|
| 556 |
|
| 557 | else:
|
| 558 | bases.append(base_class)
|
| 559 | else:
|
| 560 | tag_num = i + 1
|
| 561 | self.Emit(' %s = %d' % (variant.name, tag_num), depth)
|
| 562 | int_to_str[tag_num] = variant.name
|
| 563 | self.Emit('', depth)
|
| 564 |
|
| 565 | self._EmitDict(sum_name, int_to_str, depth)
|
| 566 |
|
| 567 | sum_name = ast.NameHack(sum_name)
|
| 568 |
|
| 569 | self.Emit('def %s_str(tag, dot=True):' % sum_name, depth)
|
| 570 | self.Emit(' # type: (int, bool) -> str', depth)
|
| 571 | self.Emit(' v = _%s_str[tag]' % sum_name, depth)
|
| 572 | self.Emit(' if dot:', depth)
|
| 573 | self.Emit(' return "%s.%%s" %% v' % sum_name, depth)
|
| 574 | self.Emit(' else:', depth)
|
| 575 | self.Emit(' return v', depth)
|
| 576 | self.Emit('', depth)
|
| 577 |
|
| 578 | # the base class, e.g. 'command_t'
|
| 579 | self.Emit('class %s_t(pybase.CompoundObj):' % sum_name, depth)
|
| 580 | self.Indent()
|
| 581 | depth = self.current_depth
|
| 582 |
|
| 583 | # To imitate C++ API
|
| 584 | self.Emit('def tag(self):')
|
| 585 | self.Emit(' # type: () -> int')
|
| 586 | self.Emit(' return self._type_tag')
|
| 587 |
|
| 588 | self.Dedent()
|
| 589 | depth = self.current_depth
|
| 590 |
|
| 591 | self.Emit('')
|
| 592 |
|
| 593 | # Declare any zero argument singleton classes outside of the main
|
| 594 | # "namespace" class.
|
| 595 | for i, variant in enumerate(sum.types):
|
| 596 | if variant.shared_type:
|
| 597 | continue # Don't generate a class for shared types.
|
| 598 | if len(variant.fields) == 0:
|
| 599 | # We must use the old-style naming here, ie. command__NoOp, in order
|
| 600 | # to support zero field variants as constants.
|
| 601 | class_name = '%s__%s' % (sum_name, variant.name)
|
| 602 | self._GenClass(variant.fields, class_name, (sum_name + '_t', ),
|
| 603 | i + 1)
|
| 604 |
|
| 605 | # Class that's just a NAMESPACE, e.g. for value.Str
|
| 606 | self.Emit('class %s(object):' % sum_name, depth)
|
| 607 |
|
| 608 | self.Indent()
|
| 609 |
|
| 610 | for i, variant in enumerate(sum.types):
|
| 611 | if variant.shared_type:
|
| 612 | continue
|
| 613 |
|
| 614 | if len(variant.fields) == 0:
|
| 615 | self.Emit('%s = %s__%s()' %
|
| 616 | (variant.name, sum_name, variant.name))
|
| 617 | self.Emit('')
|
| 618 | else:
|
| 619 | # Use fully-qualified name, so we can have osh_cmd.Simple and
|
| 620 | # oil_cmd.Simple.
|
| 621 | fq_name = variant.name
|
| 622 | self._GenClass(variant.fields,
|
| 623 | fq_name, (sum_name + '_t', ),
|
| 624 | i + 1,
|
| 625 | class_ns=sum_name + '.')
|
| 626 | self.Emit(' pass', depth) # in case every variant is first class
|
| 627 |
|
| 628 | self.Dedent()
|
| 629 | self.Emit('')
|
| 630 |
|
| 631 | def VisitSubType(self, subtype):
|
| 632 | # type: (ast.SubTypeDecl) -> None
|
| 633 | self._shared_type_tags[subtype.name] = self._product_counter
|
| 634 |
|
| 635 | # Also create these last. They may inherit from sum types that have yet
|
| 636 | # to be defined.
|
| 637 | self._subtypes.append((subtype, self._product_counter))
|
| 638 | self._product_counter += 1
|
| 639 |
|
| 640 | def VisitProduct(self, product, name, depth):
|
| 641 | # type: (ast.Product, str, int) -> None
|
| 642 | self._shared_type_tags[name] = self._product_counter
|
| 643 | # Create a tuple of _GenClass args to create LAST. They may inherit from
|
| 644 | # sum types that have yet to be defined.
|
| 645 | self._products.append((product, name, depth, self._product_counter))
|
| 646 | self._product_counter += 1
|
| 647 |
|
| 648 | def EmitFooter(self):
|
| 649 | # type: () -> None
|
| 650 | # Now generate all the product types we deferred.
|
| 651 | for args in self._products:
|
| 652 | ast_node, name, depth, tag_num = args
|
| 653 | # Figure out base classes AFTERWARD.
|
| 654 | bases = self._base_classes[name]
|
| 655 | if not bases:
|
| 656 | bases = ['pybase.CompoundObj']
|
| 657 | self._GenClass(ast_node.fields, name, bases, tag_num)
|
| 658 |
|
| 659 | for args in self._subtypes:
|
| 660 | subtype, tag_num = args
|
| 661 | # Figure out base classes AFTERWARD.
|
| 662 | bases = self._base_classes[subtype.name]
|
| 663 | if not bases:
|
| 664 | bases = ['pybase.CompoundObj']
|
| 665 |
|
| 666 | bases.append(_MyPyType(subtype.base_class))
|
| 667 |
|
| 668 | if ast.IsList(subtype.base_class):
|
| 669 | self._GenListSubclass(subtype.name, bases, tag_num)
|
| 670 | else:
|
| 671 | self._GenClass([], subtype.name, bases, tag_num)
|