53 lines
2.0 KiB
Swift
53 lines
2.0 KiB
Swift
//
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// Copyright (c) 2023 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the Software), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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import Foundation
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import Antlr4
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open class DefaultRegexReplaceGenerator: RegexReplaceGenerator {
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public let listener: PCREGeneratorListener
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public init(listener: PCREGeneratorListener = DefaultPCREGeneratorListener()) {
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self.listener = listener
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}
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open func generateReplacement(for regex: String) -> PCREGeneratorItem {
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let inputStream = ANTLRInputStream(regex)
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let lexer = PCRELexer(inputStream)
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let tokens = CommonTokenStream(lexer)
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let walker = ParseTreeWalker()
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let parser = try? PCREParser(tokens)
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guard let parseContext = try? parser?.parse() as? ParseTree else {
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fatalError("Cannot parse input regex")
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}
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listener.reset()
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try? walker.walk(listener, parseContext)
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return listener.toPCREGeneratorItem()
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}
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}
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