1 #!/usr/bin/env python 2 3 """ 4 Result abstractions. 5 6 Copyright (C) 2016, 2017 Paul Boddie <paul@boddie.org.uk> 7 8 This program is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free Software 10 Foundation; either version 3 of the License, or (at your option) any later 11 version. 12 13 This program is distributed in the hope that it will be useful, but WITHOUT 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 15 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 16 details. 17 18 You should have received a copy of the GNU General Public License along with 19 this program. If not, see <http://www.gnu.org/licenses/>. 20 """ 21 22 from referencing import Reference 23 24 # Classes representing inspection and translation observations. 25 26 class Result: 27 28 "An abstract expression result." 29 30 def is_name(self): 31 return False 32 33 def is_global_name(self): 34 return False 35 36 def reference(self): 37 return None 38 39 def references(self): 40 return None 41 42 def access_location(self): 43 return None 44 45 def context_identity(self): 46 return None 47 48 def discards_temporary(self, test=True): 49 return None 50 51 def get_name(self): 52 return None 53 54 def get_origin(self): 55 return None 56 57 def static(self): 58 return None 59 60 def final(self): 61 return None 62 63 def has_kind(self, kinds): 64 return False 65 66 class AccessRef(Result): 67 68 """ 69 A reference to an attribute access that is generally only returned from a 70 processed access for possible initialiser resolution for assignments. 71 """ 72 73 def __init__(self, original_name, attrnames, number): 74 self.original_name = original_name 75 self.attrnames = attrnames 76 self.number = number 77 78 def __repr__(self): 79 return "AccessRef(%r, %r, %r)" % (self.original_name, self.attrnames, self.number) 80 81 class InvocationRef(Result): 82 83 "An invocation of a name reference." 84 85 def __init__(self, name_ref): 86 self.name_ref = name_ref 87 88 def reference(self): 89 origin = self.name_ref.get_origin() 90 if origin: 91 return Reference("<invoke>", origin) 92 else: 93 return Reference("<var>") 94 95 def __repr__(self): 96 return "InvocationRef(%r)" % self.name_ref 97 98 class NameRef(Result): 99 100 "A reference to a name." 101 102 def __init__(self, name, expr=None, is_global=False): 103 self.name = name 104 self.expr = expr 105 self.is_global = is_global 106 107 def is_name(self): 108 return True 109 110 def is_global_name(self): 111 return self.is_global 112 113 def final(self): 114 return None 115 116 def __repr__(self): 117 return "NameRef(%r, %r, %r)" % (self.name, self.expr, self.is_global) 118 119 class LocalNameRef(NameRef): 120 121 "A reference to a local name." 122 123 def __init__(self, name, number): 124 NameRef.__init__(self, name, is_global=False) 125 self.number = number 126 127 def __repr__(self): 128 return "LocalNameRef(%r, %r)" % (self.name, self.number) 129 130 class ResolvedRef: 131 132 "A resolved reference mix-in." 133 134 def __init__(self, ref): 135 self.ref = ref 136 137 def reference(self): 138 return self.ref 139 140 def references(self): 141 return [self.ref] 142 143 def get_name(self): 144 return self.ref and self.ref.get_name() or None 145 146 def get_origin(self): 147 return self.ref and self.ref.get_origin() or None 148 149 def static(self): 150 return self.ref and self.ref.static() or None 151 152 def final(self): 153 return self.ref and self.ref.final() or None 154 155 def has_kind(self, kinds): 156 return self.ref and self.ref.has_kind(kinds) 157 158 def is_constant_alias(self): 159 return self.ref and self.ref.is_constant_alias() 160 161 class ResolvedNameRef(ResolvedRef, NameRef): 162 163 "A resolved name-based reference." 164 165 def __init__(self, name, ref, expr=None, is_global=False): 166 NameRef.__init__(self, name, expr, is_global) 167 ResolvedRef.__init__(self, ref) 168 169 def __repr__(self): 170 return "ResolvedNameRef(%r, %r, %r, %r)" % (self.name, self.ref, self.expr, self.is_global) 171 172 class ConstantValueRef(ResolvedNameRef): 173 174 "A constant reference representing a single literal value." 175 176 def __init__(self, name, ref, value, number=None): 177 ResolvedNameRef.__init__(self, name, ref) 178 self.value = value 179 self.number = number 180 181 def __repr__(self): 182 return "ConstantValueRef(%r, %r, %r, %r)" % (self.name, self.ref, self.value, self.number) 183 184 class InstanceRef(ResolvedRef, Result): 185 186 "An instance reference." 187 188 def reference(self): 189 return self.ref 190 191 def __repr__(self): 192 return "InstanceRef(%r)" % self.ref 193 194 class LiteralSequenceRef(ResolvedNameRef): 195 196 "A reference representing a sequence of values." 197 198 def __init__(self, name, ref, node, items=None): 199 ResolvedNameRef.__init__(self, name, ref) 200 self.node = node 201 self.items = items 202 203 def __repr__(self): 204 return "LiteralSequenceRef(%r, %r, %r, %r)" % (self.name, self.ref, self.node, self.items) 205 206 class VariableRef(Result): 207 208 "A variable reference." 209 210 def __repr__(self): 211 return "VariableRef()" 212 213 # vim: tabstop=4 expandtab shiftwidth=4