| 1 | #!/usr/bin/python
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| 2 | """
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| 3 | meta.py
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| 4 |
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| 5 | Another "thin waist" of the interpreter. It can be happen at compile time!
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| 6 |
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| 7 | We are following the code <-> data pattern, and this is the "data" module.
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| 8 | id_kind and asdl are the "code" modules.
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| 9 |
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| 10 | Usage:
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| 11 | from osh.meta import Id, Kind, ast, ID_SPEC
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| 12 | """
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| 13 |
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| 14 | from asdl import py_meta
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| 15 | from asdl import asdl_ as asdl
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| 16 |
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| 17 | from core import id_kind
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| 18 | from core import util
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| 19 |
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| 20 |
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| 21 | class Id(object):
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| 22 | """Token and op type.
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| 23 |
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| 24 | The evaluator must consider all Ids.
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| 25 |
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| 26 | NOTE: We add a bunch of class attributes that are INSTANCES of this class,
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| 27 | e.g. Id.Lit_Chars.
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| 28 | """
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| 29 | def __init__(self, enum_value):
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| 30 | self.enum_value = enum_value
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| 31 |
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| 32 | def __repr__(self):
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| 33 | return IdName(self)
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| 34 |
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| 35 |
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| 36 | class Kind(object):
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| 37 | """A coarser version of Id, used to make parsing decisions."""
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| 38 |
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| 39 | # TODO: The Kind type should be folded into ASDL. It can't print itself,
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| 40 | # which is inconsistent with Id.
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| 41 | pass
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| 42 |
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| 43 |
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| 44 | class _AsdlModule(object):
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| 45 | """Dummy object to copy attributes onto."""
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| 46 | pass
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| 47 |
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| 48 |
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| 49 | _ID_TO_KIND = {} # int -> Kind
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| 50 |
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| 51 | def LookupKind(id_):
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| 52 | return _ID_TO_KIND[id_.enum_value]
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| 53 |
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| 54 |
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| 55 | _ID_NAMES = {} # int -> string
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| 56 |
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| 57 | def IdName(id_):
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| 58 | return _ID_NAMES[id_.enum_value]
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| 59 |
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| 60 |
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| 61 | # Keep one instance of each Id, to save memory and enable comparison by
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| 62 | # OBJECT IDENTITY.
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| 63 | # Do NOT create any any more instances of them! Always used IdInstance().
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| 64 |
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| 65 | # TODO: Fold Id into ASDL, which will enforce uniqueness?
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| 66 |
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| 67 | _ID_INSTANCES = {} # int -> Id
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| 68 |
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| 69 | def IdInstance(i):
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| 70 | return _ID_INSTANCES[i]
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| 71 |
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| 72 |
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| 73 | #
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| 74 | # Instantiate osh/types.asdl
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| 75 | #
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| 76 |
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| 77 | f = util.GetResourceLoader().open('osh/types.asdl')
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| 78 | _asdl_module, _type_lookup = asdl.LoadSchema(f, {}) # no app_types
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| 79 |
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| 80 | types = _AsdlModule()
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| 81 | if 0:
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| 82 | py_meta.MakeTypes(_asdl_module, types, _type_lookup)
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| 83 | else:
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| 84 | # Exported for the generated code to use
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| 85 | TYPES_TYPE_LOOKUP = _type_lookup
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| 86 |
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| 87 | # Get the types from elsewhere
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| 88 | from _devbuild.gen import types_asdl
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| 89 | py_meta.AssignTypes(types_asdl, types)
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| 90 |
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| 91 | f.close()
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| 92 |
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| 93 |
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| 94 | # Id -> bool_arg_type_e
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| 95 | BOOL_ARG_TYPES = {} # type: dict
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| 96 |
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| 97 | # Used by test_builtin.py
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| 98 | TEST_UNARY_LOOKUP = {}
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| 99 | TEST_BINARY_LOOKUP = {}
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| 100 | TEST_OTHER_LOOKUP = {}
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| 101 |
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| 102 |
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| 103 | #
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| 104 | # Instantiate the spec
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| 105 | #
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| 106 |
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| 107 | ID_SPEC = id_kind.IdSpec(Id, Kind,
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| 108 | _ID_NAMES, _ID_INSTANCES, _ID_TO_KIND,
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| 109 | BOOL_ARG_TYPES)
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| 110 |
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| 111 | id_kind.AddKinds(ID_SPEC)
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| 112 | id_kind.AddBoolKinds(ID_SPEC, Id, types.bool_arg_type_e) # must come second
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| 113 | id_kind.SetupTestBuiltin(Id, Kind, ID_SPEC,
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| 114 | TEST_UNARY_LOOKUP, TEST_BINARY_LOOKUP,
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| 115 | TEST_OTHER_LOOKUP,
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| 116 | types.bool_arg_type_e)
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| 117 |
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| 118 | # Debug
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| 119 | _kind_sizes = ID_SPEC.kind_sizes
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| 120 |
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| 121 |
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| 122 | APP_TYPES = {'id': asdl.UserType(Id)}
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| 123 |
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| 124 | #
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| 125 | # Instantiate osh/osh.asdl
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| 126 | #
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| 127 |
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| 128 | f = util.GetResourceLoader().open('osh/osh.asdl')
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| 129 | _asdl_module, _type_lookup = asdl.LoadSchema(f, APP_TYPES)
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| 130 |
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| 131 | ast = _AsdlModule()
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| 132 | if 0:
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| 133 | py_meta.MakeTypes(_asdl_module, ast, _type_lookup)
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| 134 | else:
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| 135 | # Exported for the generated code to use
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| 136 | OSH_TYPE_LOOKUP = _type_lookup
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| 137 |
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| 138 | # Get the types from elsewhere
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| 139 | from _devbuild.gen import osh_asdl
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| 140 | py_meta.AssignTypes(osh_asdl, ast)
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| 141 |
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| 142 | f.close()
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| 143 |
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| 144 | #
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| 145 | # Instantiate core/runtime.asdl
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| 146 | #
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| 147 |
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| 148 | f = util.GetResourceLoader().open('core/runtime.asdl')
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| 149 | _asdl_module, _type_lookup = asdl.LoadSchema(f, APP_TYPES)
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| 150 |
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| 151 | runtime = _AsdlModule()
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| 152 | if 0:
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| 153 | py_meta.MakeTypes(_asdl_module, runtime, _type_lookup)
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| 154 | else:
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| 155 | # Exported for the generated code to use
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| 156 | RUNTIME_TYPE_LOOKUP = _type_lookup
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| 157 |
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| 158 | # Get the types from elsewhere
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| 159 | from _devbuild.gen import runtime_asdl
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| 160 | py_meta.AssignTypes(runtime_asdl, runtime)
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| 161 |
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| 162 | f.close()
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| 163 |
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| 164 | #
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| 165 | # Redirect Tables associated with IDs
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| 166 | #
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| 167 | # These might be osh specific.
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| 168 | #
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| 169 |
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| 170 | REDIR_DEFAULT_FD = {
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| 171 | # filename
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| 172 | Id.Redir_Less: 0, # cat <input.txt means cat 0<input.txt
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| 173 | Id.Redir_Great: 1,
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| 174 | Id.Redir_DGreat: 1,
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| 175 | Id.Redir_Clobber: 1,
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| 176 | Id.Redir_LessGreat: 1, # TODO: What does echo <>foo do?
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| 177 |
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| 178 | # descriptor
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| 179 | Id.Redir_GreatAnd: 1, # echo >&2 means echo 1>&2
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| 180 | Id.Redir_LessAnd: 0, # echo <&3 means echo 0<&3, I think
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| 181 |
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| 182 | Id.Redir_TLess: 0, # here word
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| 183 |
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| 184 | # here docs included
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| 185 | Id.Redir_DLess: 0,
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| 186 | Id.Redir_DLessDash: 0,
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| 187 | }
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| 188 |
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| 189 | redir_arg_type_e = types.redir_arg_type_e
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| 190 |
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| 191 | REDIR_ARG_TYPES = {
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| 192 | # filename
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| 193 | Id.Redir_Less: redir_arg_type_e.Path,
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| 194 | Id.Redir_Great: redir_arg_type_e.Path,
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| 195 | Id.Redir_DGreat: redir_arg_type_e.Path,
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| 196 | Id.Redir_Clobber: redir_arg_type_e.Path,
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| 197 | Id.Redir_LessGreat: redir_arg_type_e.Path,
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| 198 |
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| 199 | # descriptor
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| 200 | Id.Redir_GreatAnd: redir_arg_type_e.Desc,
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| 201 | Id.Redir_LessAnd: redir_arg_type_e.Desc,
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| 202 |
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| 203 | Id.Redir_TLess: redir_arg_type_e.Here, # here word
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| 204 | # note: here docs aren't included
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| 205 | }
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