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[CodeComplete] Try to substitute archetypes with actual types in code completion results.

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When completing type members, teach the code completion engine to
transform the archetypes appearing in code completion results to the
actual types. NFC

Swift SVN r31628
This commit is contained in:
Xi Ge
2015-09-02 06:22:20 +00:00
parent e09bed2a9e
commit f75ac75d3b
3 changed files with 73 additions and 4 deletions
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27
lib/Sema/CSGen.cpp
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@@ -2778,3 +2778,30 @@ bool swift::typeCheckUnresolvedExpr(DeclContext &DC,
}
return !PossibleTypes.empty();
}
Type swift::checkMemberType(DeclContext &DC, Type BaseTy,
ArrayRef<Identifier> Names) {
ConstraintSystemOptions Options = ConstraintSystemFlags::AllowFixes;
auto *TypeChecker = static_cast<class TypeChecker*>(DC.getASTContext().
getLazyResolver());
ConstraintSystem CS(*TypeChecker, &DC, Options);
auto Loc = CS.getConstraintLocator(nullptr);
Type Ty = BaseTy;
for (auto Id : Names) {
auto TV = CS.createTypeVariable(CS.getConstraintLocator(nullptr),
TypeVariableOptions::TVO_CanBindToLValue);
CS.addConstraint(Constraint::createDisjunction(CS, {
Constraint::create(CS, ConstraintKind::TypeMember, Ty,
TV, DeclName(Id), Loc),
Constraint::create(CS, ConstraintKind::ValueMember, Ty,
TV, DeclName(Id), Loc)
}, Loc));
Ty = TV;
}
assert(Ty->getKind() == TypeKind::TypeVariable && "Type is not variable");
if (auto OS = CS.solveSingle()) {
return OS.getValue().typeBindings[Ty->getAs<TypeVariableType>()];
}
return Type();
}