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56473c34cd
_preconditionFailure()s. Some of these checks are clearly redundant (for example, the check of array subscript), but since we have no tests for these traps (and reflection is not fast in general), I prefer to keep this transformation as straightforward as possible. Swift SVN r20971
54 lines
2.1 KiB
Swift
54 lines
2.1 KiB
Swift
//===----------------------------------------------------------*- swift -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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%import gyb
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%TMirrorDecl = gyb.parseTemplate("../common/MirrorDecl.gyb")
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%TMirrorConformance = gyb.parseTemplate("../common/MirrorConformance.gyb")
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%TMirrorBoilerplate = gyb.parseTemplate("../common/MirrorBoilerplate.gyb")
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% for Type in [['CollectionOfOne',1,"element",\
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% 'CollectionOfOne(\( reflect(_value.element).summary ))'],\
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% ['EmptyCollection',0,"DONTSHOWME",'EmptyCollection']]:
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% Self = Type[0]
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% Count = Type[1]
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% ElementName = Type[2]
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% SummaryString = Type[3]
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% MirrorDecl = gyb.executeTemplate(TMirrorDecl,\
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% introspecteeType=Self,\
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% genericArgs=['T'],\
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% disposition='Struct')
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% MirrorConformance = gyb.executeTemplate(TMirrorConformance,\
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% introspecteeType=Self,\
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% genericArgs=['T'],\
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% disposition='Struct')
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% MirrorBoilerplate = gyb.executeTemplate(TMirrorBoilerplate,\
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% introspecteeType=Self,\
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% genericArgs=['T'],\
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% disposition='Struct')
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${MirrorDecl} {
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${MirrorBoilerplate}
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var count: Int { return ${Count} }
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subscript(i: Int) -> (String, MirrorType) {
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_precondition(i >= 0 && i < count, "MirrorType access out of bounds")
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return ("${ElementName}", reflect(_value[advance(_value.startIndex, i)]))
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}
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var summary: String { return "${SummaryString}" }
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var quickLookObject: QuickLookObject? { return .None }
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}
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${MirrorConformance}
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