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| @@ -0,0 +1,106 @@ | ||
| // | ||
| // SQLite.swift | ||
| // https://github.com/stephencelis/SQLite.swift | ||
| // Copyright © 2014-2015 Stephen Celis. | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
| // | ||
|
|
||
| import Foundation | ||
|
|
||
| /// All five date and time functions take a time string as an argument. | ||
| /// The time string is followed by zero or more modifiers. | ||
| /// The strftime() function also takes a format string as its first argument. | ||
| /// | ||
| /// https://www.sqlite.org/lang_datefunc.html | ||
| public class DateFunctions { | ||
| /// The date() function returns the date in this format: YYYY-MM-DD. | ||
| public static func date(_ timestring: String, _ modifiers: String...) -> Expression<Date?> { | ||
| return timefunction("date", timestring: timestring, modifiers: modifiers) | ||
| } | ||
|
|
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| /// The time() function returns the time as HH:MM:SS. | ||
| public static func time(_ timestring: String, _ modifiers: String...) -> Expression<Date?> { | ||
| return timefunction("time", timestring: timestring, modifiers: modifiers) | ||
| } | ||
|
|
||
| /// The datetime() function returns "YYYY-MM-DD HH:MM:SS". | ||
| public static func datetime(_ timestring: String, _ modifiers: String...) -> Expression<Date?> { | ||
| return timefunction("datetime", timestring: timestring, modifiers: modifiers) | ||
| } | ||
|
|
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| /// The julianday() function returns the Julian day - | ||
| /// the number of days since noon in Greenwich on November 24, 4714 B.C. | ||
| public static func julianday(_ timestring: String, _ modifiers: String...) -> Expression<Date?> { | ||
| return timefunction("julianday", timestring: timestring, modifiers: modifiers) | ||
| } | ||
|
|
||
| /// The strftime() routine returns the date formatted according to the format string specified as the first argument. | ||
| public static func strftime(_ format: String, _ timestring: String, _ modifiers: String...) -> Expression<Date?> { | ||
| if !modifiers.isEmpty { | ||
| let templates = [String](repeating: "?", count: modifiers.count).joined(separator: ", ") | ||
| return Expression("strftime(?, ?, \(templates))", [format, timestring] + modifiers) | ||
| } | ||
| return Expression("strftime(?, ?)", [format, timestring]) | ||
| } | ||
|
|
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| private static func timefunction(_ name: String, timestring: String, modifiers: [String]) -> Expression<Date?> { | ||
| if !modifiers.isEmpty { | ||
| let templates = [String](repeating: "?", count: modifiers.count).joined(separator: ", ") | ||
| return Expression("\(name)(?, \(templates))", [timestring] + modifiers) | ||
| } | ||
| return Expression("\(name)(?)", [timestring]) | ||
| } | ||
| } | ||
|
|
||
| extension Date { | ||
| public var date: Expression<Date?> { | ||
| return DateFunctions.date(dateFormatter.string(from: self)) | ||
| } | ||
|
|
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| public var time: Expression<Date?> { | ||
| return DateFunctions.time(dateFormatter.string(from: self)) | ||
| } | ||
|
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| public var datetime: Expression<Date?> { | ||
| return DateFunctions.datetime(dateFormatter.string(from: self)) | ||
| } | ||
|
|
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| public var julianday: Expression<Date?> { | ||
| return DateFunctions.julianday(dateFormatter.string(from: self)) | ||
| } | ||
| } | ||
|
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| extension Expression where UnderlyingType == Date { | ||
| public var date: Expression<Date> { | ||
| return Expression<Date>("date(\(template))", bindings) | ||
| } | ||
|
|
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| public var time: Expression<Date> { | ||
| return Expression<Date>("time(\(template))", bindings) | ||
| } | ||
|
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| public var datetime: Expression<Date> { | ||
| return Expression<Date>("datetime(\(template))", bindings) | ||
| } | ||
|
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| public var julianday: Expression<Date> { | ||
| return Expression<Date>("julianday(\(template))", bindings) | ||
| } | ||
| } |
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