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Change the symbol generation algorithm. Rename the struct.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| public struct ReusabilityHint { | ||
| internal enum Mark: Equatable { | ||
| case node(Any.Type) | ||
| case begin | ||
| case end | ||
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| static func == (lhs: Mark, rhs: Mark) -> Bool { | ||
| switch (lhs, rhs) { | ||
| case let (.node(lhs), .node(rhs)): | ||
| return lhs == rhs | ||
| case (.begin, .begin), (.end, end): | ||
| return true | ||
| default: | ||
| return false | ||
| } | ||
| } | ||
| } | ||
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| internal var marks: [Mark] | ||
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| internal init<R: Renderable>(root: R) { | ||
| marks = [.node(root.componentType), .begin] | ||
| } | ||
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| public mutating func combine<R: Renderable>(_ component: R) { | ||
| marks.append(.node(component.componentType)) | ||
| marks.append(.begin) | ||
| component.makeReusabilityHint(&self) | ||
| marks.append(.end) | ||
| } | ||
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| func generate() -> String { | ||
| // NOTE: It isn't quite important that we generate a very clean symbol. It only needs to be consistently | ||
| // reproduced. | ||
| var symbol = marks.reduce(into: "") { buffer, mark in | ||
| switch mark { | ||
| case let .node(type): | ||
| buffer += fullyQualifiedTypeName(of: type) | ||
| case .begin: | ||
| buffer += "[" | ||
| case .end: | ||
| buffer += "]" | ||
| } | ||
| } | ||
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| // NOTE: Since the root node opens with a `begin` mark, we should balance it with an `end` mark. | ||
| symbol += "]" | ||
| return symbol | ||
| } | ||
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| func isCompatible(with other: ReusabilityHint) -> Bool { | ||
| return marks == other.marks | ||
| } | ||
| } | ||
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| func fullyQualifiedTypeName(of type: Any.Type) -> String { | ||
| /// NOTE: `String.init(reflecting:)` gives the fully qualified type name. | ||
| // Tests would catch unexpeced type name printing behavior due to Swift runtime changes. | ||
| return String(reflecting: type) | ||
| } |
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