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 reference(self): 34 return None 35 36 def references(self): 37 return None 38 39 def get_name(self): 40 return None 41 42 def get_origin(self): 43 return None 44 45 def static(self): 46 return None 47 48 def final(self): 49 return None 50 51 def has_kind(self, kinds): 52 return False 53 54 class AccessRef(Result): 55 56 """ 57 A reference to an attribute access that is generally only returned from a 58 processed access for possible initialiser resolution for assignments. 59 """ 60 61 def __init__(self, original_name, attrnames, number): 62 self.original_name = original_name 63 self.attrnames = attrnames 64 self.number = number 65 66 def __repr__(self): 67 return "AccessRef(%r, %r, %r)" % (self.original_name, self.attrnames, self.number) 68 69 class InvocationRef(Result): 70 71 "An invocation of a name reference." 72 73 def __init__(self, name_ref): 74 self.name_ref = name_ref 75 76 def reference(self): 77 origin = self.name_ref.get_origin() 78 if origin: 79 return Reference("<invoke>", origin) 80 else: 81 return Reference("<var>") 82 83 def __repr__(self): 84 return "InvocationRef(%r)" % self.name_ref 85 86 class NameRef(Result): 87 88 "A reference to a name." 89 90 def __init__(self, name, expr=None): 91 self.name = name 92 self.expr = expr 93 94 def is_name(self): 95 return True 96 97 def final(self): 98 return None 99 100 def __repr__(self): 101 return "NameRef(%r, %r)" % (self.name, self.expr) 102 103 class LocalNameRef(NameRef): 104 105 "A reference to a local name." 106 107 def __init__(self, name, number): 108 NameRef.__init__(self, name) 109 self.number = number 110 111 def __repr__(self): 112 return "LocalNameRef(%r, %r)" % (self.name, self.number) 113 114 class ResolvedRef: 115 116 "A resolved reference mix-in." 117 118 def __init__(self, ref): 119 self.ref = ref 120 121 def reference(self): 122 return self.ref 123 124 def references(self): 125 return [self.ref] 126 127 def get_name(self): 128 return self.ref and self.ref.get_name() or None 129 130 def get_origin(self): 131 return self.ref and self.ref.get_origin() or None 132 133 def static(self): 134 return self.ref and self.ref.static() or None 135 136 def final(self): 137 return self.ref and self.ref.final() or None 138 139 def has_kind(self, kinds): 140 return self.ref and self.ref.has_kind(kinds) 141 142 def is_constant_alias(self): 143 return self.ref and self.ref.is_constant_alias() 144 145 class ResolvedNameRef(ResolvedRef, NameRef): 146 147 "A resolved name-based reference." 148 149 def __init__(self, name, ref, expr=None): 150 NameRef.__init__(self, name, expr) 151 ResolvedRef.__init__(self, ref) 152 153 def __repr__(self): 154 return "ResolvedNameRef(%r, %r, %r)" % (self.name, self.ref, self.expr) 155 156 class ConstantValueRef(ResolvedNameRef): 157 158 "A constant reference representing a single literal value." 159 160 def __init__(self, name, ref, value, number=None): 161 ResolvedNameRef.__init__(self, name, ref) 162 self.value = value 163 self.number = number 164 165 def __repr__(self): 166 return "ConstantValueRef(%r, %r, %r, %r)" % (self.name, self.ref, self.value, self.number) 167 168 class InstanceRef(ResolvedRef, Result): 169 170 "An instance reference." 171 172 def reference(self): 173 return self.ref 174 175 def __repr__(self): 176 return "InstanceRef(%r)" % self.ref 177 178 class LiteralSequenceRef(ResolvedNameRef): 179 180 "A reference representing a sequence of values." 181 182 def __init__(self, name, ref, node, items=None): 183 ResolvedNameRef.__init__(self, name, ref) 184 self.node = node 185 self.items = items 186 187 def __repr__(self): 188 return "LiteralSequenceRef(%r, %r, %r, %r)" % (self.name, self.ref, self.node, self.items) 189 190 class VariableRef(Result): 191 192 "A variable reference." 193 194 def __repr__(self): 195 return "VariableRef()" 196 197 # vim: tabstop=4 expandtab shiftwidth=4