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56bf9a3469
AbsolutePosition being a mutable reference type easily leads to bugs where an AbsolutePosition is modified. Making it immutable eliminates this issue. Furthermore, the introduction of SourceLength should allow easier manipulation of AbsolutePositions on the client side. We still cannot make AbsolutePosition a value type since it is used inside AtomicCache, but the immutability gives the same safety.
28 lines
972 B
Swift
28 lines
972 B
Swift
//===--------------- AbsolutePosition.swift - Source Positions ------------===//
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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 - 2017 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 https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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/// An absolute position in a source file as text - the absolute utf8Offset from
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/// the start, line, and column.
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public final class AbsolutePosition {
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public let utf8Offset: Int
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public let line: Int
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public let column: Int
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static let startOfFile = AbsolutePosition(line: 1, column: 1, utf8Offset: 0)
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public init(line: Int, column: Int, utf8Offset: Int) {
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self.line = line
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self.column = column
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self.utf8Offset = utf8Offset
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}
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}
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