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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
fileprivate let bom: Unicode.Scalar = "\u{feff}"
fileprivate let unknownScalar: Unicode.Scalar = "\u{fffe}"
final class GarbageTextTests: PrettyPrintTestCase {
func testHashBang() {
let input =
"""
#!/usr/bin/swift -foo -bar
print("Hello world!")
"""
let expected =
"""
#!/usr/bin/swift -foo -bar
print(
"Hello world!")
"""
assertPrettyPrintEqual(input: input, expected: expected, linelength: 20)
}
func testBOM() {
let input =
"""
\(bom)print("Hello world!")
"""
let expected =
"""
\(bom)print("Hello world!")
"""
assertPrettyPrintEqual(input: input, expected: expected, linelength: 21)
}
func testBOMPresenceDoesNotPermitLeadingNewlines() {
let input =
"""
\(bom)
print("Hello world!")
"""
let expected =
"""
\(bom)print("Hello world!")
"""
assertPrettyPrintEqual(input: input, expected: expected, linelength: 21)
}
func testUnknownCodePointAsLeadingTrivia() {
let input =
"""
\(unknownScalar)print("Hello world!")
"""
let expected =
"""
\(unknownScalar)print("Hello world!")
"""
assertPrettyPrintEqual(input: input, expected: expected, linelength: 21)
}
func testUnknownCodePointAsTrailingTriviaAreGluedToPreviousToken() {
// Note: The third line here is a bit of a weird case. Despite the operator being separated from
// the left-hand-side by a space, the intervening garbage text appears to put the parser in a
// mode where it treats the operator as a postfix operator, which then causes `secondTerm` to be
// parsed as its own distinct statement and `CodeBlockItem`---hence the lack of indentation.
let input =
"""
x = y\(unknownScalar)+z
x = firstTerm\(unknownScalar)+secondTerm
x = firstTerm \(unknownScalar)+ secondTerm
x = firstTerm\(unknownScalar) + secondTerm
x = firstTerm \(unknownScalar) + secondTerm
x = firstTerm \(unknownScalar) \(unknownScalar) + secondTerm
"""
let expected =
"""
x = y\(unknownScalar) + z
x =
firstTerm\(unknownScalar)
+ secondTerm
x = firstTerm \(unknownScalar)+
secondTerm
x =
firstTerm\(unknownScalar)
+ secondTerm
x =
firstTerm \(unknownScalar)
+ secondTerm
x =
firstTerm \(unknownScalar) \(unknownScalar)
+ secondTerm
"""
assertPrettyPrintEqual(input: input, expected: expected, linelength: 20)
}
func testConflictMarkers() {
let input =
"""
func greet() {
print("Hello")
<<<<<<< hash:filename
print("werld")
=======
print("world")
>>>>>>> hash:filename
print("!!")
}
"""
let expected =
"""
func greet() {
print("Hello")
<<<<<<< hash:filename
print("werld")
=======
print("world")
>>>>>>> hash:filename
print("!!")
}
"""
assertPrettyPrintEqual(input: input, expected: expected, linelength: 80)
}
}
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