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* add CSV.guessedDelimiter(string:) helper * add delimiter-guessing initializer * add CSV.Delimiter enum * use CSV.Delimiter for initializers * re-group initializers * expand README to mention delimiters and talk a bit about the API
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| // | ||
| // CSV+DelimiterGuessing.swift | ||
| // SwiftCSV | ||
| // | ||
| // Created by Christian Tietze on 21.12.21. | ||
| // Copyright © 2021 SwiftCSV. All rights reserved. | ||
| // | ||
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| import Foundation | ||
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| extension CSV { | ||
| public static let recognizedDelimiters: [Delimiter] = [.comma, .tab, .semicolon] | ||
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| /// - Returns: Delimiter between cells based on the first line in the CSV. Falls back to `.comma`. | ||
| public static func guessedDelimiter(string: String) -> Delimiter { | ||
| let recognizedDelimiterCharacters = recognizedDelimiters.map(\.rawValue) | ||
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| // Trim newline and spaces, but keep tabs (as delimiters) | ||
| var trimmedCharacters = CharacterSet.whitespacesAndNewlines | ||
| trimmedCharacters.remove("\t") | ||
| let line = string.trimmingCharacters(in: trimmedCharacters).firstLine | ||
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| var index = line.startIndex | ||
| while index < line.endIndex { | ||
| let character = line[index] | ||
| switch character { | ||
| case "\"": | ||
| // When encountering an open quote, skip to the closing counterpart. | ||
| // If none is found, skip to end of line. | ||
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| // 1) Advance one character to skip the quote | ||
| index = line.index(after: index) | ||
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| // 2) Look for the closing quote and move current position after it | ||
| if index < line.endIndex, | ||
| let closingQuoteInddex = line[index...].firstIndex(of: character) { | ||
| index = line.index(after: closingQuoteInddex) | ||
| } else { | ||
| index = line.endIndex | ||
| } | ||
| case _ where recognizedDelimiterCharacters.contains(character): | ||
| return Delimiter(rawValue: character) | ||
| default: | ||
| index = line.index(after: index) | ||
| } | ||
| } | ||
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| // Fallback value | ||
| return .comma | ||
| } | ||
| } |
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