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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2021-2022 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
//
//===----------------------------------------------------------------------===//
@available(SwiftStdlib 5.7, *)
/// A protocol allowing custom types to function as regex components by
/// providing the raw functionality backing `prefixMatch`.
public protocol CustomConsumingRegexComponent: RegexComponent {
/// Process the input string within the specified bounds, beginning at the given index, and return
/// the end position (upper bound) of the match and the produced output.
/// - Parameters:
/// - input: The string in which the match is performed.
/// - index: An index of `input` at which to begin matching.
/// - bounds: The bounds in `input` in which the match is performed.
/// - Returns: The upper bound where the match terminates and a matched instance, or `nil` if
/// there isn't a match.
func consuming(
_ input: String,
startingAt index: String.Index,
in bounds: Range<String.Index>
) throws -> (upperBound: String.Index, output: RegexOutput)?
}
@available(SwiftStdlib 5.7, *)
extension CustomConsumingRegexComponent {
public var regex: Regex<RegexOutput> {
let node: DSLTree.Node = .matcher(RegexOutput.self, { input, index, bounds in
try consuming(input, startingAt: index, in: bounds)
})
return Regex(node: node)
}
}
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