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37 lines
1.8 KiB
Swift
37 lines
1.8 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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/// Splits `message` on newline characters such that each chunk is at most `maxChunkSize` bytes long.
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///
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/// The intended use case for this is to split compiler arguments and a file's contents into multiple chunks so
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/// that each chunk doesn't exceed the maximum message length of `os_log` and thus won't get truncated.
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///
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/// - Note: This will only split along newline boundary. If a single line is longer than `maxChunkSize`, it won't be
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/// split. This is fine for compiler argument splitting since a single argument is rarely longer than 800 characters.
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package func splitLongMultilineMessage(message: String, maxChunkSize: Int = 800) -> [String] {
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var chunks: [String] = []
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for line in message.split(separator: "\n", omittingEmptySubsequences: false) {
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if let lastChunk = chunks.last, lastChunk.utf8.count + line.utf8.count < maxChunkSize {
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chunks[chunks.count - 1] += "\n" + line
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} else {
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if !chunks.isEmpty {
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// Append an end marker to the last chunk so that os_log doesn't truncate trailing whitespace,
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// which would modify the source contents.
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// Empty newlines are important so the offset of the request is correct.
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chunks[chunks.count - 1] += "\n--- End Chunk"
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}
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chunks.append(String(line))
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}
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}
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return chunks
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}
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