133 lines
3.4 KiB
Swift
133 lines
3.4 KiB
Swift
//
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// SQLite.swift
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// https://github.com/stephencelis/SQLite.swift
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// Copyright © 2014-2015 Stephen Celis.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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/// - Warning: `Binding` is a protocol that SQLite.swift uses internally to
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/// directly map SQLite types to Swift types.
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///
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/// Do not conform custom types to the Binding protocol. See the `Value`
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/// protocol, instead.
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public protocol Binding {}
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public protocol Number : Binding {}
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public protocol Value : Expressible { // extensions cannot have inheritance clauses
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associatedtype ValueType = Self
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associatedtype Datatype : Binding
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static var declaredDatatype: String { get }
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static func fromDatatypeValue(_ datatypeValue: Datatype) -> ValueType
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var datatypeValue: Datatype { get }
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}
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extension Double : Number, Value {
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public static let declaredDatatype = "REAL"
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public static func fromDatatypeValue(_ datatypeValue: Double) -> Double {
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return datatypeValue
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}
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public var datatypeValue: Double {
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return self
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}
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}
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extension Int64 : Number, Value {
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public static let declaredDatatype = "INTEGER"
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public static func fromDatatypeValue(_ datatypeValue: Int64) -> Int64 {
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return datatypeValue
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}
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public var datatypeValue: Int64 {
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return self
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}
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}
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extension String : Binding, Value {
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public static let declaredDatatype = "TEXT"
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public static func fromDatatypeValue(_ datatypeValue: String) -> String {
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return datatypeValue
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}
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public var datatypeValue: String {
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return self
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}
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}
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extension Blob : Binding, Value {
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public static let declaredDatatype = "BLOB"
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public static func fromDatatypeValue(_ datatypeValue: Blob) -> Blob {
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return datatypeValue
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}
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public var datatypeValue: Blob {
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return self
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}
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}
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// MARK: -
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extension Bool : Binding, Value {
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public static var declaredDatatype = Int64.declaredDatatype
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public static func fromDatatypeValue(_ datatypeValue: Int64) -> Bool {
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return datatypeValue != 0
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}
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public var datatypeValue: Int64 {
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return self ? 1 : 0
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}
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}
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extension Int : Number, Value {
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public static var declaredDatatype = Int64.declaredDatatype
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public static func fromDatatypeValue(_ datatypeValue: Int64) -> Int {
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return Int(datatypeValue)
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}
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public var datatypeValue: Int64 {
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return Int64(self)
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}
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}
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