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Format.swift
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68 lines (55 loc) · 2.18 KB
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import Foundation
public extension Validation {
/// Validate a string matches a regular expression.
/// - Parameters:
/// - pattern: The regular expression pattern.
/// - options: The regular expression options that are applied to the
/// expression during matching. See NSRegularExpression.Options for possible values.
/// - message: Custom error message.
/// - Returns: A Validation<String> instance.
static func format(
_ pattern: String,
options: NSRegularExpression.Options = [],
message: String? = nil
) -> Validation<String> {
.init { value in
let regex = NSRegularExpression(pattern, options: options)
guard !regex.matches(value) else { return }
throw ValidationError.build(message: message)
}
}
/// Validate an optional string matches a regular expression.
/// - Parameters:
/// - pattern: The regular expression pattern.
/// - options: The regular expression options that are applied to the
/// expression during matching. See NSRegularExpression.Options for possible values.
/// - message: Custom error message.
/// - Returns: A Validation<String> instance.
static func format(
_ pattern: String,
options: NSRegularExpression.Options = [],
message: String? = nil
) -> Validation<Optional<String>> {
.init { value in
guard let value = value else {
throw ValidationError.build(message: message)
}
let regex = NSRegularExpression(pattern, options: options)
guard !regex.matches(value) else { return }
throw ValidationError.build(message: message)
}
}
}
// MARK: Error
extension ValidationError {
private static func format() -> ValidationError {
.init(description: "Is incorrectly formatted")
}
// MARK: Builder
fileprivate static func build(message: String?) -> ValidationError {
guard let message = message else {
return ValidationError.format()
}
return ValidationError(description: message)
}
}