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Alexis Bridoux
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Feb 3, 2021
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| // | ||
| // Scout | ||
| // Copyright (c) Alexis Bridoux 2020 | ||
| // MIT license, see LICENSE file for details | ||
|
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| import Foundation | ||
| import BooleanExpressionEvaluation | ||
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| public enum PathsFilter { | ||
| case targetOnly(ValueTarget) | ||
| case key(regex: NSRegularExpression, target: ValueTarget) | ||
| case value(Predicate) | ||
| case keyAndValue(keyRegex: NSRegularExpression, valuePredicate: Predicate) | ||
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| /// Allows group values (array, dictionaries) | ||
| var groupAllowed: Bool { | ||
| switch self { | ||
| case .targetOnly(let target), .key(_, let target): return target.groupAllowed | ||
| case .value, .keyAndValue: return false | ||
| } | ||
| } | ||
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| /// Allow single values (string, bool...) | ||
| var singleAllowed: Bool { | ||
| switch self { | ||
| case .targetOnly(let target), .key(_, let target): return target.singleAllowed | ||
| case .value, .keyAndValue: return true | ||
| } | ||
| } | ||
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| /// Validate a key when the filter has a key regex | ||
| func validate(key: String) -> Bool { | ||
| switch self { | ||
| case .key(let regex, _), .keyAndValue(let regex, _): return regex.validate(key) | ||
| case .value, .targetOnly: return true | ||
| } | ||
| } | ||
|
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| /// Validate an index when the filter is has no key regex | ||
| func validate(index: Int) -> Bool { | ||
| switch self { | ||
| case .key: return false | ||
| case .value, .keyAndValue, .targetOnly: return true | ||
| } | ||
| } | ||
|
|
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| /// Validate a value when the filter has a value predicate | ||
| func validate(value: Any) -> Bool { | ||
| switch self { | ||
| case .value(let predicate), .keyAndValue(_, let predicate): return predicate.evaluate(with: value) | ||
| case .key, .targetOnly: | ||
| return true | ||
| } | ||
| } | ||
| } | ||
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| extension PathsFilter { | ||
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| /// Specifies if group (array, dictionary) values, single (string, bool...) values or both should be targeted | ||
| public enum ValueTarget: String, CaseIterable { | ||
| /// Allows the key with a single or a group value | ||
| case singleAndGroup | ||
| /// Allows the key with a single value | ||
| case group | ||
| /// Allows the key with a group (array, dictionary) value | ||
| case single | ||
|
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| /// Allows group values (array, dictionaries) | ||
| var groupAllowed: Bool { [.singleAndGroup, .group].contains(self) } | ||
|
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| /// Allow single values (string, bool...) | ||
| var singleAllowed: Bool { [.singleAndGroup, .single].contains(self) } | ||
| } | ||
| } | ||
|
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| extension PathsFilter { | ||
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| /// Allow to specify a bollean expression to filter the value | ||
| /// | ||
| /// The value is specified as the variable 'value' in the expression. | ||
| /// - `value > 10` | ||
| /// - `value hasPrefix 'Lou' && value hasSuffix 'lou'` | ||
| /// | ||
| /// - note: Public wrapper around BoleeanExpressionEvaluation.Expression | ||
| public struct Predicate { | ||
| var expression: Expression | ||
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| init(expression: Expression) { | ||
| self.expression = expression | ||
| } | ||
|
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| /// Specify a predicate with a 'value' variable that will be replaced with a concrete value during evaluation | ||
| public init(format: String) throws { | ||
| expression = try Expression(format) | ||
| } | ||
|
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| public func evaluate(with value: Any) -> Bool { | ||
| let result = try? expression.evaluate(with: ["variable": String(describing: value)]) | ||
| return result ?? true //ignore the error of wrong value type | ||
| } | ||
| } | ||
| } | ||
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| extension PathsFilter { | ||
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| /// No filter with target `singleAndGroup` | ||
| public static var noFilter: PathsFilter { .targetOnly(.singleAndGroup) } | ||
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| /// Key filter with `singleAndGroup` target | ||
| public static func key(regex: NSRegularExpression) -> PathsFilter { .key(regex: regex, target: .singleAndGroup) } | ||
| } |
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