mirror of https://github.com/Wilfred/difftastic/
66 lines
2.2 KiB
Swift
66 lines
2.2 KiB
Swift
// The MIT License (MIT)
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//
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// Copyright (c) 2016 Luke Zhao <me@lkzhao.com>
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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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import Foundation
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public protocol HeroStringConvertible {
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static func from(node: ExprNode) -> Self?
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// ^ keyword
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}
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extension String {
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func parse<T: HeroStringConvertible>() -> [T]? {
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// ^ punctuation.delimiter
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// ^ type
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let lexer = Lexer(input: self)
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let parser = Parser(tokens: lexer.tokenize())
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// ^ punctuation.delimiter
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// ^ function.call
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do {
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// ^ keyword
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let nodes = try parser.parse()
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// ^ operator
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var results = [T]()
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// ^ punctuation.bracket
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for node in nodes {
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if let modifier = T.from(node: node) {
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results.append(modifier)
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} else {
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print("\(node.name) doesn't exist in \(T.self)")
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// ^ string
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}
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}
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return results
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} catch let error {
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// ^ keyword
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// ^ keyword
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// ^ variable
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print("failed to parse \"\(self)\", error: \(error)")
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}
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return nil
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}
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func parseOne<T: HeroStringConvertible>() -> T? {
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return parse()?.last
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}
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}
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