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[LiteralPrinter] Use ICU-style escaping for Unicode scalars #725

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Merged
merged 1 commit into from
Feb 29, 2024
Merged

[LiteralPrinter] Use ICU-style escaping for Unicode scalars #725

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12 changes: 11 additions & 1 deletion Sources/_StringProcessing/LiteralPrinter.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -444,7 +444,17 @@ extension String {

extension UnicodeScalar {
var escapedString: String {
"\\u{" + String(value, radix: 16) + "}"
switch self {
case "\n": return #"\n"#
case "\r": return #"\r"#
case "\t": return #"\t"#
default:
let code = String(value, radix: 16, uppercase: true)
let prefix = code.count <= 4
? #"\u"# + String(repeating: "0", count: 4 - code.count)
: #"\U"# + String(repeating: "0", count: 8 - code.count)
return prefix + code
}
}
}

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31 changes: 24 additions & 7 deletions Tests/RegexTests/LiteralPrinterTests.swift
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Expand Up @@ -14,17 +14,35 @@ import XCTest
import _StringProcessing
import RegexBuilder

@available(SwiftStdlib 5.11, *)
fileprivate func _literalTest<T>(
_ regex: Regex<T>,
expected: String?,
file: StaticString = #filePath,
line: UInt = #line
) {
XCTAssertEqual(regex._literalPattern, expected, file: file, line: line)
if let expected {
let remadeRegex = try? Regex(expected)
XCTAssertEqual(expected, remadeRegex?._literalPattern, file: file, line: line)
}
}

@available(SwiftStdlib 5.11, *)
extension RegexTests {
func testPrintableRegex() throws {
let regexString = #"([a-fGH1-9[^\D]]+)?b*cd(e.+)\2\w\S+?"#
let regex = try! Regex(regexString)
let pattern = try XCTUnwrap(regex._literalPattern)
let regex = try Regex(regexString)
// Note: This is true for this particular regex, but not all regexes
XCTAssertEqual(regexString, pattern)
_literalTest(regex, expected: regexString)

let printableRegex = try XCTUnwrap(PrintableRegex(regex))
XCTAssertEqual("\(printableRegex)", pattern)
XCTAssertEqual("\(printableRegex)", regexString)
}

func testUnicodeEscapes() throws {
let regex = #/\r\n\t cafe\u{301} \u{1D11E}/#
_literalTest(regex, expected: #"\r\n\t cafe\u0301 \U0001D11E"#)
}

func testPrintableDSLRegex() throws {
Expand All @@ -39,8 +57,7 @@ extension RegexTests {
}.dotMatchesNewlines()
Optionally("c")
}.ignoresCase()
let pattern = try XCTUnwrap(regex._literalPattern)
XCTAssertEqual("(?i:(?:aaa)+?(?s:(?:bbb)*|d+|e{3,})c?)", pattern)
_literalTest(regex, expected: "(?i:(?:aaa)+?(?s:(?:bbb)*|d+|e{3,})c?)")

let nonPrintableRegex = Regex {
OneOrMore("a")
Expand All @@ -49,7 +66,7 @@ extension RegexTests {
} transform: { Int($0)! }
Optionally("b")
}
XCTAssertNil(nonPrintableRegex._literalPattern)
_literalTest(nonPrintableRegex, expected: nil)
}
}

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