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67ca1c9ea1
There's a bit of a reshuffle of the ExplicitCastExpr subclasses: - The existing ConditionalCheckedCastExpr expression node now represents "as?". - A new ForcedCheckedCastExpr node represents "as" when it is a downcast. - CoerceExpr represents "as" when it is a coercion. - A new UnresolvedCheckedCastExpr node describes "as" before it has been type-checked down to ForcedCheckedCastExpr or CoerceExpr. This wasn't a strictly necessary change, but it helps us detangle what's going on. There are a few new diagnostics to help users avoid getting bitten by as/as? mistakes: - Custom errors when a forced downcast (as) is used as the operand of postfix '!' or '?', with Fix-Its to remove the '!' or make the downcast conditional (with as?), respectively. - A warning when a forced downcast is injected into an optional, with a suggestion to use a conditional downcast. - A new error when the postfix '!' is used for a contextual downcast, with a Fix-It to replace it with "as T" with the contextual type T. Lots of test updates, none of which felt like regressions. The new tests are in test/expr/cast/optionals.swift. Addresses <rdar://problem/17000058> Swift SVN r18556
64 lines
1.6 KiB
Swift
64 lines
1.6 KiB
Swift
// RUN: %target-run-simple-swift | FileCheck %s
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import Foundation
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// Add a method to String to make sure a value is really a String and not
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// implicitly converted from an NSString, since method lookup doesn't see through
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// implicit conversions.
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extension String {
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func reallyAString() -> String { return self }
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}
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func printString(x: String) {
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println(x)
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}
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func printDescription(o: AnyObject) {
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println(o.description!.reallyAString())
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}
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class Pootie : NSObject {
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override var description : String {
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return "cole me down on the panny sty"
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}
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func sinePittyOnRunnyKine(x: String) -> String {
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return "\(x). sa-da-tay"
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}
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}
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var a:NSNumber = 2001
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printDescription(a) // CHECK: 2001
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var p = Pootie()
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printDescription(p) // CHECK: cole me down on the panny sty
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var s1:String = "wa-da-ta"
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// We don't say 'var s2:NSString = "..."' in order to keep this test independent of the
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// ABI of NSString.convertFromStringLiteral.
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var s2s:String = "kappa-chow"
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var s2:NSString = s2s
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printDescription(s2) // CHECK: kappa-chow
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printDescription(p.sinePittyOnRunnyKine(s2)) // CHECK: kappa-chow. sa-da-tay
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var s3:String = s2.stringByAppendingPathComponent(s1).reallyAString()
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printDescription(s3) // CHECK: kappa-chow/wa-da-ta
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// Unicode conversion
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var s4 : String = NSString(string: "\uf8ff\ufffd")
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printDescription(s4) // CHECK: <EFBFBD>
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// NSCFConstantString conversion
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var s5 : String = NSRangeException
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printDescription(s5) // CHECK: NSRangeException
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// Check conversions to AnyObject
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var s6: NSString = "foo"
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var ao: AnyObject = s6.copy()
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var s7 = ao as NSString
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var s8 = ao as? String
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// CHECK-NEXT: done
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println("done")
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