58 lines
2.0 KiB
Swift
58 lines
2.0 KiB
Swift
// Copyright 2020 Carton contributors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import Foundation
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extension StringProtocol {
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/// Return the first match of the `NSRegularExpression` from the string.
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func matches(regex: NSRegularExpression) -> String.SubSequence? {
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let str = String(self)
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guard let range = str.range(of: regex),
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range.upperBound < str.endIndex
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else { return nil }
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return str[range.upperBound..<str.endIndex]
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}
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/// Find the range of the first match of the `NSRegularExpression`.
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func range(of regex: NSRegularExpression) -> Range<String.Index>? {
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let str = String(self)
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let range = NSRange(location: 0, length: utf16.count)
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guard let match = regex.firstMatch(in: str, options: [], range: range),
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let matchRange = Range(match.range, in: str)
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else {
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return nil
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}
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return matchRange
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}
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func range(of regex: NSRegularExpression, named name: String) -> Range<String.Index>? {
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let str = String(self)
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let range = NSRange(location: 0, length: utf16.count)
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guard let matches = regex.matches(in: str, options: [], range: range).first,
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let matchRange = Range(matches.range(withName: name), in: str)
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else {
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return nil
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}
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return matchRange
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}
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func match(of regex: NSRegularExpression, named name: String) -> String.SubSequence? {
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let str = String(self)
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guard let range = str.range(of: regex, named: name),
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range.upperBound < str.endIndex && range.lowerBound >= str.startIndex
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else { return nil }
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return str[range]
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}
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}
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