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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import SwiftShims
extension StringProtocol {
@inlinable
@_specialize(where Self == String, RHS == String)
@_specialize(where Self == String, RHS == Substring)
@_specialize(where Self == Substring, RHS == String)
@_specialize(where Self == Substring, RHS == Substring)
@_effects(readonly)
public static func == <RHS: StringProtocol>(lhs: Self, rhs: RHS) -> Bool {
return _stringCompare(
lhs._wholeGuts, lhs._offsetRange,
rhs._wholeGuts, rhs._offsetRange,
expecting: .equal)
}
@inlinable @inline(__always) // forward to other operator
@_effects(readonly)
public static func != <RHS: StringProtocol>(lhs: Self, rhs: RHS) -> Bool {
return !(lhs == rhs)
}
@inlinable
@_specialize(where Self == String, RHS == String)
@_specialize(where Self == String, RHS == Substring)
@_specialize(where Self == Substring, RHS == String)
@_specialize(where Self == Substring, RHS == Substring)
@_effects(readonly)
public static func < <RHS: StringProtocol>(lhs: Self, rhs: RHS) -> Bool {
return _stringCompare(
lhs._wholeGuts, lhs._offsetRange,
rhs._wholeGuts, rhs._offsetRange,
expecting: .less)
}
@inlinable @inline(__always) // forward to other operator
@_effects(readonly)
public static func > <RHS: StringProtocol>(lhs: Self, rhs: RHS) -> Bool {
return rhs < lhs
}
@inlinable @inline(__always) // forward to other operator
@_effects(readonly)
public static func <= <RHS: StringProtocol>(lhs: Self, rhs: RHS) -> Bool {
return !(rhs < lhs)
}
@inlinable @inline(__always) // forward to other operator
@_effects(readonly)
public static func >= <RHS: StringProtocol>(lhs: Self, rhs: RHS) -> Bool {
return !(lhs < rhs)
}
}
extension String: Equatable {
@inlinable @inline(__always) // For the bitwise comparison
@_effects(readonly)
@_semantics("string.equals")
public static func == (lhs: String, rhs: String) -> Bool {
return _stringCompare(lhs._guts, rhs._guts, expecting: .equal)
}
}
extension String: Comparable {
@inlinable @inline(__always) // For the bitwise comparison
@_effects(readonly)
public static func < (lhs: String, rhs: String) -> Bool {
return _stringCompare(lhs._guts, rhs._guts, expecting: .less)
}
}
extension Substring: Equatable {}
// TODO: Generalize `~=` over `StringProtocol` (https://github.com/apple/swift/issues/54896)
// Below are concrete overloads to give us most of the benefit without potential
// harm to expression type checking performance.
extension String {
@_alwaysEmitIntoClient
@inline(__always)
@_effects(readonly)
public static func ~= (lhs: String, rhs: Substring) -> Bool {
return lhs == rhs
}
}
extension Substring {
@_alwaysEmitIntoClient
@inline(__always)
@_effects(readonly)
public static func ~= (lhs: Substring, rhs: String) -> Bool {
return lhs == rhs
}
}
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