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