107 lines
3.0 KiB
Swift
107 lines
3.0 KiB
Swift
import Foundation
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extension String {
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var nonEmpty: String? {
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self.isEmpty ? nil : self
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}
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var trimmed: String {
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trimmingCharacters(in: .whitespacesAndNewlines)
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}
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func indented(by indentation: String) -> String {
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components(separatedBy: "\n").joined(separator: "\n" + indentation)
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}
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var withoutEmptyLines: String {
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components(separatedBy: "\n")
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.filter { !$0.trimmed.isEmpty }
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.joined(separator: "\n")
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}
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/**
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Remove the part after the last occurence of the separator (including the separator itself).
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The string is left unchanges, if it does not contain the separator.
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*/
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func dropAfterLast(_ separator: String) -> String {
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guard contains(separator) else {
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return self
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}
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return components(separatedBy: separator).dropLast().joined(separator: separator)
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}
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func dropBeforeFirst(_ separator: String) -> String {
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guard contains(separator) else {
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return self
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}
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return components(separatedBy: separator).dropFirst().joined(separator: separator)
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}
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func lastComponentAfter(_ separator: String) -> String {
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components(separatedBy: separator).last!
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}
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/**
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Insert the new content before the last occurence of the specified separator.
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If the separator does not appear in the string, then the new content is simply appended.
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*/
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func insert(_ content: String, beforeLast separator: String) -> String {
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let parts = components(separatedBy: separator)
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guard parts.count > 1 else {
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return self + content
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}
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return parts.dropLast().joined(separator: separator) + content + separator + parts.last!
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}
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/**
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Remove everything behind the first separator.
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Also removes the separator itself. If the separator is not contained in the string, then the full string is returned.
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*/
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func dropAfterFirst<T>(_ separator: T) -> String where T: StringProtocol {
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components(separatedBy: separator).first!
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}
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func between(_ start: String, and end: String) -> String {
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dropBeforeFirst(start).dropAfterFirst(end)
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}
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}
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extension Substring {
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func dropBeforeFirst(_ separator: String) -> String {
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guard contains(separator) else {
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return String(self)
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}
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return components(separatedBy: separator).dropFirst().joined(separator: separator)
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}
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func between(_ start: String, and end: String) -> String {
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components(separatedBy: start).last!
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.components(separatedBy: end).first!
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}
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func between(first: String, andLast last: String) -> String {
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dropBeforeFirst(first).dropAfterLast(last)
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}
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func last(after: String) -> String {
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components(separatedBy: after).last!
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}
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}
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extension String {
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func createFolderAndWrite(to url: URL) throws {
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try data(using: .utf8)!.createFolderAndWrite(to: url)
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}
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}
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extension String: DefaultValueProvider {
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static var defaultValue: String { "" }
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}
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