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MatchTests.swift
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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2021-2022 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
//
//===----------------------------------------------------------------------===//
import XCTest
@testable import _RegexParser
@testable @_spi(RegexBenchmark) @_spi(Foundation) import _StringProcessing
import TestSupport
struct MatchError: Error {
var message: String
init(_ message: String) {
self.message = message
}
}
// This just piggy-backs on the existing match testing to validate that
// literal patterns round trip correctly.
@available(SwiftStdlib 6.0, *)
func _roundTripLiteral(
_ regexStr: String,
syntax: SyntaxOptions
) throws -> Regex<AnyRegexOutput>? {
guard let pattern = try Regex(regexStr, syntax: syntax)._literalPattern else {
return nil
}
let remadeRegex = try Regex(pattern)
XCTAssertEqual(pattern, remadeRegex._literalPattern)
return remadeRegex
}
func _firstMatch(
_ regexStr: String,
input: String,
validateOptimizations: Bool,
semanticLevel: RegexSemanticLevel = .graphemeCluster,
syntax: SyntaxOptions = .traditional
) throws -> (String, [String?])? {
var regex = try Regex(regexStr, syntax: syntax).matchingSemantics(semanticLevel)
let result = try regex.firstMatch(in: input)
func validateSubstring(_ substringInput: Substring) throws {
// Sometimes the characters we add to a substring merge with existing
// string members. This messes up cross-validation, so skip the test.
guard input == substringInput else { return }
let substringResult = try regex.firstMatch(in: substringInput)
switch (result, substringResult) {
case (nil, nil):
break
case let (result?, substringResult?):
if substringResult.range.upperBound > substringInput.endIndex {
throw MatchError("Range exceeded substring upper bound for \(input) and \(regexStr)")
}
let stringMatch = input[result.range]
let substringMatch = substringInput[substringResult.range]
if stringMatch != substringMatch {
throw MatchError("""
Pattern: '\(regexStr)'
String match returned: '\(stringMatch)'
Substring match returned: '\(substringMatch)'
""")
}
case (.some(let result), nil):
throw MatchError("""
Pattern: '\(regexStr)'
Input: '\(input)'
Substring '\(substringInput)' ('\(substringInput.base)')
String match returned: '\(input[result.range])'
Substring match returned: nil
""")
case (nil, .some(let substringResult)):
throw MatchError("""
Pattern: '\(regexStr)'
Input: '\(input)'
Substring '\(substringInput)' ('\(substringInput.base)')
String match returned: nil
Substring match returned: '\(substringInput[substringResult.range])'
""")
}
}
if #available(SwiftStdlib 6.0, *) {
let roundTripRegex = try? _roundTripLiteral(regexStr, syntax: syntax)
let roundTripResult = try? roundTripRegex?
.matchingSemantics(semanticLevel)
.firstMatch(in: input)?[0]
.substring
switch (result?[0].substring, roundTripResult) {
case let (match?, rtMatch?):
XCTAssertEqual(match, rtMatch)
case (nil, nil):
break // okay
case let (match?, _):
XCTFail("""
Didn't match in round-tripped version of '\(regexStr)'
For input '\(input)'
Original: '\(regexStr)'
_literalPattern: '\(roundTripRegex?._literalPattern ?? "<no pattern>")'
""")
case let (_, rtMatch?):
XCTFail("""
Incorrectly matched as '\(rtMatch)'
For input '\(input)'
Original: '\(regexStr)'
_literalPattern: '\(roundTripRegex!._literalPattern!)'
""")
}
}
if !input.isEmpty {
try validateSubstring("\(input)\(input.last!)".dropLast())
}
try validateSubstring("\(input)\n".dropLast())
try validateSubstring("A\(input)Z".dropFirst().dropLast())
do {
// Test sub-character slicing
let str = input + "\n"
let prevIndex = str.unicodeScalars.index(str.endIndex, offsetBy: -1)
try validateSubstring(str[..<prevIndex])
}
do {
// Validate that we don't crash when sub-scalar slicing is used
// Actual matching behavior is untested here
let str = "\u{e9}\(input)e\u{e9}"
let upper = str.utf8.index(before: str.endIndex)
_ = try regex.firstMatch(in: str[..<upper])
let lower = str.utf8.index(after: str.startIndex)
_ = try regex.firstMatch(in: str[lower...])
}
if validateOptimizations {
precondition(regex._forceAction(.addOptions(.disableOptimizations)))
let unoptResult = try regex.firstMatch(in: input)
if result != nil && unoptResult == nil {
throw MatchError("match not found for unoptimized \(regexStr) in \(input)")
}
if result == nil && unoptResult != nil {
throw MatchError("match not found in optimized \(regexStr) in \(input)")
}
if let result = result, let unoptResult = unoptResult {
let optMatch = String(input[result.range])
let unoptMatch = String(input[unoptResult.range])
if optMatch != unoptMatch {
throw MatchError("""
Unoptimized regex returned: '\(unoptMatch)'
Optimized regex returned: '\(optMatch)'
""")
}
}
}
guard let result = result else { return nil }
let caps = result.output.slices(from: input)
return (String(input[result.range]), caps.map { $0.map(String.init) })
}
// TODO: multiple-capture variant
// TODO: unify with firstMatch below, etc.
func flatCaptureTest(
_ regex: String,
_ tests: (input: String, expect: [String?]?)...,
syntax: SyntaxOptions = .traditional,
dumpAST: Bool = false,
xfail: Bool = false,
validateOptimizations: Bool = true,
semanticLevel: RegexSemanticLevel = .graphemeCluster,
file: StaticString = #file,
line: UInt = #line
) {
for (test, expect) in tests {
do {
guard var (_, caps) = try? _firstMatch(
regex,
input: test,
validateOptimizations: validateOptimizations,
semanticLevel: semanticLevel,
syntax: syntax
) else {
if expect == nil {
continue
} else {
throw MatchError("Match failed")
}
}
// Peel off the whole match.
caps.removeFirst()
guard let expect = expect else {
throw MatchError("""
Match of \(test) succeeded where failure expected in \(regex)
""")
}
let capStrs = caps.map { $0 == nil ? nil : String($0!) }
guard expect.count == capStrs.count else {
throw MatchError("""
Capture count mismatch:
\(expect)
\(capStrs)
""")
}
guard expect.elementsEqual(capStrs) else {
throw MatchError("""
Capture mismatch:
\(expect)
\(capStrs)
""")
}
} catch {
if !xfail {
XCTFail("\(error)", file: file, line: line)
}
}
}
}
/// Test whether a string matches or not
///
/// TODO: Configuration for whole vs partial string matching...
func matchTest(
_ regex: String,
_ tests: (input: String, expect: Bool)...,
syntax: SyntaxOptions = .traditional,
enableTracing: Bool = false,
dumpAST: Bool = false,
xfail: Bool = false,
validateOptimizations: Bool = true,
semanticLevel: RegexSemanticLevel = .graphemeCluster,
file: StaticString = #file,
line: UInt = #line
) {
for (test, expect) in tests {
firstMatchTest(
regex,
input: test,
match: expect ? test : nil,
syntax: syntax,
enableTracing: enableTracing,
dumpAST: dumpAST,
xfail: xfail,
validateOptimizations: validateOptimizations,
semanticLevel: semanticLevel,
file: file,
line: line)
}
}
// TODO: Adjust below to also check captures
/// Test all matches in a string, using `matches(of:)`.
func allMatchesTest(
_ regex: String,
input: String,
matches: [Substring],
xfail: Bool = false,
semanticLevel: RegexSemanticLevel = .graphemeCluster,
file: StaticString = #filePath,
line: UInt = #line
) {
do {
let regex = try Regex(regex).matchingSemantics(semanticLevel)
let allMatches = input.matches(of: regex).map(\.0)
if xfail {
XCTAssertNotEqual(allMatches, matches, file: file, line: line)
} else {
XCTAssertEqual(allMatches, matches, "Incorrect match", file: file, line: line)
}
} catch {
if !xfail {
XCTFail("\(error)", file: file, line: line)
}
return
}
}
/// Test the first match in a string, via `firstRange(of:)`
func firstMatchTest(
_ regex: String,
input: String,
match: String?,
syntax: SyntaxOptions = .traditional,
enableTracing: Bool = false,
dumpAST: Bool = false,
xfail: Bool = false,
validateOptimizations: Bool = true,
semanticLevel: RegexSemanticLevel = .graphemeCluster,
file: StaticString = #filePath,
line: UInt = #line
) {
do {
let found = try _firstMatch(
regex,
input: input,
validateOptimizations: validateOptimizations,
semanticLevel: semanticLevel,
syntax: syntax)?.0
if xfail {
XCTAssertNotEqual(found, match, file: file, line: line)
} else {
XCTAssertEqual(found, match, "Incorrect match", file: file, line: line)
}
} catch {
if !xfail {
XCTFail("\(error)", file: file, line: line)
}
return
}
}
func firstMatchTests(
_ regex: String,
_ tests: (input: String, match: String?)...,
syntax: SyntaxOptions = .traditional,
enableTracing: Bool = false,
dumpAST: Bool = false,
xfail: Bool = false,
semanticLevel: RegexSemanticLevel = .graphemeCluster,
file: StaticString = #filePath,
line: UInt = #line
) {
for (input, match) in tests {
firstMatchTest(
regex,
input: input,
match: match,
syntax: syntax,
enableTracing: enableTracing,
dumpAST: dumpAST,
xfail: xfail,
semanticLevel: semanticLevel,
file: file,
line: line)
}
}
extension RegexTests {
func testMatch() {
firstMatchTest(
"abc", input: "123abcxyz", match: "abc")
firstMatchTest(
#"abc\+d*"#, input: "123abc+xyz", match: "abc+")
firstMatchTest(
#"abc\+d*"#, input: "123abc+dddxyz", match: "abc+ddd")
firstMatchTest(
"a(b)", input: "123abcxyz", match: "ab")
firstMatchTest(
"(.)*(.*)", input: "123abcxyz", match: "123abcxyz")
firstMatchTest(
#"abc\d"#, input: "xyzabc123", match: "abc1")
// MARK: Allowed combining characters
firstMatchTest("e\u{301}", input: "e\u{301}", match: "e\u{301}")
firstMatchTest("1\u{358}", input: "1\u{358}", match: "1\u{358}")
firstMatchTest(#"\ \#u{361}"#, input: " \u{361}", match: " \u{361}")
// MARK: Alternations
firstMatchTest(
"abc(?:de)+fghi*k|j", input: "123abcdefghijxyz", match: "j")
firstMatchTest(
"abc(?:de)+fghi*k|j", input: "123abcdedefghkxyz", match: "abcdedefghk")
firstMatchTest(
"a(?:b|c)?d", input: "123adxyz", match: "ad")
firstMatchTest(
"a(?:b|c)?d", input: "123abdxyz", match: "abd")
firstMatchTest(
"a(?:b|c)?d", input: "123acdxyz", match: "acd")
firstMatchTest(
"a?b??c+d+?e*f*?", input: "123abcdefxyz", match: "abcde")
firstMatchTest(
"a?b??c+d+?e*f*?", input: "123bcddefxyz", match: "bcd")
firstMatchTest(
"a|b?c", input: "123axyz", match: "a")
firstMatchTest(
"a|b?c", input: "123bcxyz", match: "bc")
firstMatchTest(
"(a|b)c", input: "123abcxyz", match: "bc")
// Alternations with empty branches are permitted.
firstMatchTest("|", input: "ab", match: "")
firstMatchTest("(|)", input: "ab", match: "")
firstMatchTest("a|", input: "ab", match: "a")
firstMatchTest("a|", input: "ba", match: "")
firstMatchTest("|b", input: "ab", match: "")
firstMatchTest("|b", input: "ba", match: "")
firstMatchTest("|b|", input: "ab", match: "")
firstMatchTest("|b|", input: "ba", match: "")
firstMatchTest("a|b|", input: "ab", match: "a")
firstMatchTest("a|b|", input: "ba", match: "b")
firstMatchTest("a|b|", input: "ca", match: "")
firstMatchTest("||c|", input: "ab", match: "")
firstMatchTest("||c|", input: "cb", match: "")
firstMatchTest("|||", input: "ab", match: "")
firstMatchTest("a|||d", input: "bc", match: "")
firstMatchTest("a|||d", input: "abc", match: "a")
firstMatchTest("a|||d", input: "d", match: "")
// MARK: Unicode scalars
firstMatchTest(
#"a\u0065b\u{00000065}c\x65d\U00000065"#,
input: "123aebecedexyz", match: "aebecede")
firstMatchTest(
#"\u{00000000000000000000000000A}"#,
input: "123\nxyz", match: "\n")
firstMatchTest(
#"\x{00000000000000000000000000A}"#,
input: "123\nxyz", match: "\n")
firstMatchTest(
#"\o{000000000000000000000000007}"#,
input: "123\u{7}xyz", match: "\u{7}")
firstMatchTest(#"\o{70}"#, input: "1238xyz", match: "8")
firstMatchTest(#"\0"#, input: "123\0xyz", match: "\0")
firstMatchTest(#"\01"#, input: "123\u{1}xyz", match: "\u{1}")
firstMatchTest(#"\070"#, input: "1238xyz", match: "8")
firstMatchTest(#"\07A"#, input: "123\u{7}Axyz", match: "\u{7}A")
firstMatchTest(#"\08"#, input: "123\08xyz", match: "\08")
firstMatchTest(#"\0707"#, input: "12387\u{1C7}xyz", match: "\u{1C7}")
// code point sequence
firstMatchTest(#"\u{61 62 63}"#, input: "123abcxyz", match: "abc")
firstMatchTest(#"3\u{ 61 62 63 }"#, input: "123abcxyz", match: "3abc")
firstMatchTest(#"\u{61 62}\u{63}"#, input: "123abcxyz", match: "abc")
firstMatchTest(#"\u{61}\u{62 63}"#, input: "123abcxyz", match: "abc")
firstMatchTest(#"9|\u{61 62 63}"#, input: "123abcxyz", match: "abc")
firstMatchTest(#"(?:\u{61 62 63})"#, input: "123abcxyz", match: "abc")
firstMatchTest(#"23\u{61 62 63}xy"#, input: "123abcxyz", match: "23abcxy")
// o + horn + dot_below
firstMatchTest(
#"\u{006f 031b 0323}"#,
input: "\u{006f}\u{031b}\u{0323}",
match: "\u{006f}\u{031b}\u{0323}"
)
// e + combining accents
firstMatchTest(
#"e\u{301 302 303}"#,
input: "e\u{301}\u{302}\u{303}",
match: "e\u{301}\u{302}\u{303}"
)
firstMatchTest(
#"e\u{315 35C 301}"#,
input: "e\u{301}\u{315}\u{35C}",
match: "e\u{301}\u{315}\u{35C}"
)
firstMatchTest(
#"e\u{301}\u{302 303}"#,
input: "e\u{301}\u{302}\u{303}",
match: "e\u{301}\u{302}\u{303}"
)
firstMatchTest(
#"e\u{35C}\u{315 301}"#,
input: "e\u{301}\u{315}\u{35C}",
match: "e\u{301}\u{315}\u{35C}"
)
firstMatchTest(
#"e\u{35C}\u{315 301}"#,
input: "e\u{315}\u{301}\u{35C}",
match: "e\u{315}\u{301}\u{35C}"
)
firstMatchTest(
#"e\u{301}\de\u{302}"#,
input: "e\u{301}0e\u{302}",
match: "e\u{301}0e\u{302}"
)
firstMatchTest(
#"(?x) e \u{35C} \u{315}(?#hello)\u{301}"#,
input: "e\u{301}\u{315}\u{35C}",
match: "e\u{301}\u{315}\u{35C}"
)
firstMatchTest(
#"(?x) e \u{35C} \u{315 301}"#,
input: "e\u{301}\u{315}\u{35C}",
match: "e\u{301}\u{315}\u{35C}"
)
// We don't coalesce across groups.
firstMatchTests(
#"e\u{301}(?:\u{315}\u{35C})?"#,
("e\u{301}", "e\u{301}"),
("e\u{301}\u{315}\u{35C}", nil)
)
// Escape sequences that represent scalar values.
firstMatchTest(#"\a[\b]\e\f\n\r\t"#,
input: "\u{7}\u{8}\u{1B}\u{C}\n\r\t",
match: "\u{7}\u{8}\u{1B}\u{C}\n\r\t")
firstMatchTest(#"[\a][\b][\e][\f][\n][\r][\t]"#,
input: "\u{7}\u{8}\u{1B}\u{C}\n\r\t",
match: "\u{7}\u{8}\u{1B}\u{C}\n\r\t")
// MARK: Quotes
firstMatchTest(
#"a\Q .\Eb"#,
input: "123a .bxyz", match: "a .b")
firstMatchTest(
#"a\Q \Q \\.\Eb"#,
input: #"123a \Q \\.bxyz"#, match: #"a \Q \\.b"#)
firstMatchTest(
#"\d\Q...\E"#,
input: "Countdown: 3... 2... 1...", match: "3...")
// MARK: Comments
firstMatchTest(
#"a(?#comment)b"#, input: "123abcxyz", match: "ab")
firstMatchTest(
#"a(?#. comment)b"#, input: "123abcxyz", match: "ab")
}
func testMatchQuantification() {
// MARK: Quantification
firstMatchTest(
#"a{1,2}"#, input: "123aaaxyz", match: "aa")
firstMatchTest(
#"a{ 1 , 2 }"#, input: "123aaaxyz", match: "aa")
firstMatchTest(
#"a{,2}"#, input: "123aaaxyz", match: "")
firstMatchTest(
#"a{ , 2 }"#, input: "123aaaxyz", match: "")
firstMatchTest(
#"a{,2}x"#, input: "123aaaxyz", match: "aax")
firstMatchTest(
#"a{,2}x"#, input: "123xyz", match: "x")
firstMatchTest(
#"a{2,}"#, input: "123aaaxyz", match: "aaa")
firstMatchTest(
#"a{1}"#, input: "123aaaxyz", match: "a")
firstMatchTest(
#"a{ 1 }"#, input: "123aaaxyz", match: "a")
firstMatchTest(
#"a{1,2}?"#, input: "123aaaxyz", match: "a")
firstMatchTest(
#"a{1,2}?x"#, input: "123aaaxyz", match: "aax")
firstMatchTest(
#"xa{0}y"#, input: "123aaaxyz", match: "xy")
firstMatchTest(
#"xa{0,0}y"#, input: "123aaaxyz", match: "xy")
firstMatchTest(
#"(a|a){2}a"#, input: "123aaaxyz", match: "aaa")
firstMatchTest(
#"(a|a){3}a"#, input: "123aaaxyz", match: nil)
firstMatchTest("a.*", input: "dcba", match: "a")
firstMatchTest("a*", input: "", match: "")
firstMatchTest("a*", input: "a", match: "a")
firstMatchTest("a*", input: "aaa", match: "aaa")
firstMatchTest("a*?", input: "", match: "")
firstMatchTest("a*?", input: "a", match: "")
firstMatchTest("a*?a", input: "aaa", match: "a")
firstMatchTest("xa*?x", input: "_xx__", match: "xx")
firstMatchTest("xa*?x", input: "_xax__", match: "xax")
firstMatchTest("xa*?x", input: "_xaax__", match: "xaax")
firstMatchTest("a+", input: "", match: nil)
firstMatchTest("a+", input: "a", match: "a")
firstMatchTest("a+", input: "aaa", match: "aaa")
firstMatchTest("a+?", input: "", match: nil)
firstMatchTest("a+?", input: "a", match: "a")
firstMatchTest("a+?a", input: "aaa", match: "aa")
firstMatchTest("xa+?x", input: "_xx__", match: nil)
firstMatchTest("xa+?x", input: "_xax__", match: "xax")
firstMatchTest("xa+?x", input: "_xaax__", match: "xaax")
firstMatchTest("a??", input: "", match: "")
firstMatchTest("a??", input: "a", match: "")
firstMatchTest("a??a", input: "aaa", match: "a")
firstMatchTest("xa??x", input: "_xx__", match: "xx")
firstMatchTest("xa??x", input: "_xax__", match: "xax")
firstMatchTest("xa??x", input: "_xaax__", match: nil)
// Possessive .* will consume entire input
firstMatchTests(
".*+x",
("abc", nil), ("abcx", nil), ("", nil))
firstMatchTests(
"a+b",
("abc", "ab"),
("aaabc", "aaab"),
("b", nil))
firstMatchTests(
"a++b",
("abc", "ab"),
("aaabc", "aaab"),
("b", nil))
firstMatchTests(
"a+?b",
("abc", "ab"),
("aaabc", "aaab"), // firstRange will match from front
("b", nil))
firstMatchTests(
"a+a",
("babc", nil),
("baaabc", "aaa"),
("bb", nil))
firstMatchTests(
"a++a",
("babc", nil),
("baaabc", nil),
("bb", nil))
firstMatchTests(
"a+?a",
("babc", nil),
("baaabc", "aa"),
("bb", nil))
firstMatchTests(
"a{2,4}a",
("babc", nil),
("baabc", nil),
("baaabc", "aaa"),
("baaaaabc", "aaaaa"),
("baaaaaaaabc", "aaaaa"),
("bb", nil))
firstMatchTests(
"a{,4}a",
("babc", "a"),
("baabc", "aa"),
("baaabc", "aaa"),
("baaaaabc", "aaaaa"),
("baaaaaaaabc", "aaaaa"),
("bb", nil))
firstMatchTests(
"a{2,}a",
("babc", nil),
("baabc", nil),
("baaabc", "aaa"),
("baaaaabc", "aaaaa"),
("baaaaaaaabc", "aaaaaaaa"),
("bb", nil))
firstMatchTests(
"a{2,4}?a",
("babc", nil),
("baabc", nil),
("baaabc", "aaa"),
("baaaaabc", "aaa"),
("baaaaaaaabc", "aaa"),
("bb", nil))
firstMatchTests(
"a{,4}?a",
("babc", "a"),
("baabc", "a"),
("baaabc", "a"),
("baaaaabc", "a"),
("baaaaaaaabc", "a"),
("bb", nil))
firstMatchTests(
"a{2,}?a",
("babc", nil),
("baabc", nil),
("baaabc", "aaa"),
("baaaaabc", "aaa"),
("baaaaaaaabc", "aaa"),
("bb", nil))
firstMatchTests(
"a{2,4}+a",
("babc", nil),
("baabc", nil),
("baaaaabc", "aaaaa"),
("baaaaaaaabc", "aaaaa"),
("bb", nil))
firstMatchTests(
"a{,4}+a",
("baaaaabc", "aaaaa"),
("baaaaaaaabc", "aaaaa"),
("bb", nil))
firstMatchTests(
"a{2,}+a",
("babc", nil),
("baabc", nil),
("bb", nil))
firstMatchTests(
"a{2,4}+a",
("baaabc", nil))
firstMatchTests(
"a{,4}+a",
("babc", nil),
("baabc", nil),
("baaabc", nil))
firstMatchTests(
"a{2,}+a",
("baaabc", nil),
("baaaaabc", nil),
("baaaaaaaabc", nil))
// XFAIL'd possessive tests
firstMatchTests(
"a?+a",
("a", nil),
xfail: true)
firstMatchTests(
"(a|a)?+a",
("a", nil),
xfail: true)
firstMatchTests(
"(a|a){2,4}+a",
("a", nil),
("aa", nil))
firstMatchTests(
"(a|a){2,4}+a",
("aaa", nil),
("aaaa", nil),
xfail: true)
firstMatchTests(
"(?:a{2,4}?b)+",
("aab", "aab"),
("aabaabaab", "aabaabaab"),
("aaabaaaabaabab", "aaabaaaabaab")
// TODO: Nested reluctant reentrant example, xfailed
)
// Reluctant by default - '*/+/.' and '*?/+?/.?' are swapped
firstMatchTest("(?U)a*", input: "aaa", match: "")
firstMatchTest("(?U)a*a", input: "aaa", match: "a")
firstMatchTest("(?U)a*?", input: "aaa", match: "aaa")
firstMatchTest("(?U)a*?a", input: "aaa", match: "aaa")
firstMatchTest("(?U)a+", input: "aaa", match: "a")
firstMatchTest("(?U)a+?", input: "aaa", match: "aaa")
firstMatchTest("(?U)a?", input: "a", match: "")
firstMatchTest("(?U)a?a", input: "aaa", match: "a")
firstMatchTest("(?U)a??", input: "a", match: "a")
firstMatchTest("(?U)a??a", input: "aaa", match: "aa")
// TODO: After captures, easier to test these
}
func testQuantificationScalarSemantics() {
// TODO: We want more thorough testing here, including "a{n,m}", "a?", etc.
firstMatchTest("a*", input: "aaa\u{301}", match: "aa")
firstMatchTest("a*", input: "aaa\u{301}", match: "aaa", semanticLevel: .unicodeScalar)
firstMatchTest("a+", input: "aaa\u{301}", match: "aa")
firstMatchTest("a+", input: "aaa\u{301}", match: "aaa", semanticLevel: .unicodeScalar)
firstMatchTest("a?", input: "a\u{301}", match: "")
firstMatchTest("a?", input: "a\u{301}", match: "a", semanticLevel: .unicodeScalar)
firstMatchTest("[ab]*", input: "abab\u{301}", match: "aba")
firstMatchTest("[ab]*", input: "abab\u{301}", match: "abab", semanticLevel: .unicodeScalar)
firstMatchTest("[ab]+", input: "abab\u{301}", match: "aba")
firstMatchTest("[ab]+", input: "abab\u{301}", match: "abab", semanticLevel: .unicodeScalar)
firstMatchTest("[ab]?", input: "b\u{301}", match: "")
firstMatchTest("[ab]?", input: "b\u{301}", match: "b", semanticLevel: .unicodeScalar)
firstMatchTest(#"\s*"#, input: " \u{301}", match: " \u{301}")
firstMatchTest(#"\s*"#, input: " \u{301}", match: " ", semanticLevel: .unicodeScalar)
firstMatchTest(#"\s+"#, input: " \u{301}", match: " \u{301}")
firstMatchTest(#"\s+"#, input: " \u{301}", match: " ", semanticLevel: .unicodeScalar)
firstMatchTest(#"\s?"#, input: " \u{301}", match: " \u{301}")
firstMatchTest(#"\s?"#, input: " \u{301}", match: " ", semanticLevel: .unicodeScalar)
firstMatchTest(#".*?a"#, input: "xxa\u{301}xaZ", match: "xxa\u{301}xa")
firstMatchTest(#".*?a"#, input: "xxa\u{301}xaZ", match: "xxa", semanticLevel: .unicodeScalar)
firstMatchTest(#".+?a"#, input: "xxa\u{301}xaZ", match: "xxa\u{301}xa")
firstMatchTest(#".+?a"#, input: "xxa\u{301}xaZ", match: "xxa", semanticLevel: .unicodeScalar)
firstMatchTest(#".?a"#, input: "e\u{301}aZ", match: "e\u{301}a")
firstMatchTest(#".?a"#, input: "e\u{301}aZ", match: "\u{301}a", semanticLevel: .unicodeScalar)
firstMatchTest(#".+\u{301}"#, input: "aa\u{301}Z", match: nil)
firstMatchTest(#".+\u{301}"#, input: "aa\u{301}Z", match: "aa\u{301}", semanticLevel: .unicodeScalar)
firstMatchTest(#".*\u{301}"#, input: "\u{301}Z", match: "\u{301}")
firstMatchTest(#".*\u{301}"#, input: "\u{301}Z", match: "\u{301}", semanticLevel: .unicodeScalar)
firstMatchTest(#".?\u{301}"#, input: "aa\u{302}\u{301}Z", match: nil)
firstMatchTest(#".?\u{301}.?Z"#, input: "aa\u{302}\u{301}Z", match: "\u{302}\u{301}Z", semanticLevel: .unicodeScalar)
firstMatchTest(#".?.?\u{301}.?Z"#, input: "aa\u{302}\u{301}Z", match: "a\u{302}\u{301}Z", semanticLevel: .unicodeScalar)
// TODO: other test cases?
}
func testMatchCharacterClasses() {
// Must have new stdlib for character class ranges and word boundaries.
guard ensureNewStdlib() else { return }
// MARK: Character classes
firstMatchTest(#"abc\d"#, input: "xyzabc123", match: "abc1")
firstMatchTest(
"[-|$^:?+*())(*-+-]", input: "123(abc)xyz", match: "(")
firstMatchTest(
"[-|$^:?+*())(*-+-]", input: "123-abcxyz", match: "-")
firstMatchTest(
"[-|$^:?+*())(*-+-]", input: "123^abcxyz", match: "^")
firstMatchTest(
"[a-b-c]", input: "123abcxyz", match: "a")
firstMatchTest(
"[a-b-c]", input: "123-abcxyz", match: "-")
firstMatchTest("[-a-]", input: "123abcxyz", match: "a")
firstMatchTest("[-a-]", input: "123-abcxyz", match: "-")
firstMatchTest("[a-z]", input: "123abcxyz", match: "a")
firstMatchTest("[a-z]", input: "123ABCxyz", match: "x")
firstMatchTest("[a-z]", input: "123-abcxyz", match: "a")
firstMatchTest("(?x)[ a - z ]+", input: " 123-abcxyz", match: "abcxyz")
// Character class subtraction
firstMatchTest("[a-d--a-c]", input: "123abcdxyz", match: "d")
// Inverted character class
matchTest(#"[^a]"#,
("💿", true),
("a\u{301}", true),
("A", true),
("a", false))
matchTest(#"(?i)[a]"#,
("💿", false),
("a\u{301}", false),
("A", true),
("a", true))
matchTest("[a]",
("a\u{301}", false))
// CR-LF special case: \r\n is a single character with ascii value equal
// to \n, so make sure the ascii bitset optimization handles this correctly
matchTest("[\r\n]",
("\r\n", true),
("\n", false),
("\r", false))
// check that in scalar mode this case is handled correctly
// in scalar semantics the character "\r\n" in the character class is
// interpreted as matching the scalars "\r" or "\n".
// It does not fully match the character "\r\n" because the character class
// in scalar mode will only match one scalar
matchTest(
"^[\r\n]$",
("\r", true),
("\n", true),
("\r\n", false),
semanticLevel: .unicodeScalar)
matchTest("[^\r\n]",
("\r\n", false),
("\n", true),
("\r", true))
matchTest("[\n\r]",
("\n", true),
("\r", true),
("\r\n", false))
let allNewlines = "\u{A}\u{B}\u{C}\u{D}\r\n\u{85}\u{2028}\u{2029}"
let asciiNewlines = "\u{A}\u{B}\u{C}\u{D}\r\n"
for level in [RegexSemanticLevel.graphemeCluster, .unicodeScalar] {
firstMatchTest(
#"\R+"#,
input: "abc\(allNewlines)def", match: allNewlines,
semanticLevel: level
)
firstMatchTest(
#"\v+"#,
input: "abc\(allNewlines)def", match: allNewlines,
semanticLevel: level
)
}
// In scalar mode, \R can match \r\n, \v cannot.
firstMatchTest(
#"\R"#, input: "\r\n", match: "\r\n", semanticLevel: .unicodeScalar)
firstMatchTest(
#"\v"#, input: "\r\n", match: "\r", semanticLevel: .unicodeScalar)
firstMatchTest(
#"\v\v"#, input: "\r\n", match: "\r\n", semanticLevel: .unicodeScalar)
firstMatchTest(
#"[^\v]"#, input: "\r\n", match: nil, semanticLevel: .unicodeScalar)
// ASCII-only spaces.
firstMatchTest(#"(?S)\R+"#, input: allNewlines, match: asciiNewlines)
firstMatchTest(#"(?S)\v+"#, input: allNewlines, match: asciiNewlines)
firstMatchTest(
#"(?S)\R"#, input: "\r\n", match: "\r\n", semanticLevel: .unicodeScalar)
firstMatchTest(
#"(?S)\v"#, input: "\r\n", match: "\r", semanticLevel: .unicodeScalar)
matchTest(
#"[a]\u0301"#,
("a\u{301}", false),
semanticLevel: .graphemeCluster)
matchTest(
#"[a]\u0301"#,
("a\u{301}", true),
semanticLevel: .unicodeScalar)
// Scalar matching in quoted sequences.
firstMatchTests(
"[\\Qe\u{301}\\E]",
("e", nil),
("E", nil),
("\u{301}", nil),
(eDecomposed, eDecomposed),
(eComposed, eComposed),
("E\u{301}", nil),
("\u{C9}", nil)
)
firstMatchTests(
"[\\Qe\u{301}\\E]",
("e", "e"),
("E", nil),
("\u{301}", "\u{301}"),
(eDecomposed, "e"),
(eComposed, nil),
("E\u{301}", "\u{301}"),
("\u{C9}", nil),
semanticLevel: .unicodeScalar
)
firstMatchTests(
"(?i)[\\Qe\u{301}\\E]",
("e", nil),
("E", nil),
("\u{301}", nil),
(eDecomposed, eDecomposed),
(eComposed, eComposed),
("E\u{301}", "E\u{301}"),
("\u{C9}", "\u{C9}")
)
firstMatchTests(
"(?i)[\\Qe\u{301}\\E]",
("e", "e"),
("E", "E"),
("\u{301}", "\u{301}"),
(eDecomposed, "e"),
(eComposed, nil),
("E\u{301}", "E"),
("\u{C9}", nil),
semanticLevel: .unicodeScalar
)
// Scalar coalescing.
firstMatchTests(
#"[e\u{301}]"#,
(eDecomposed, eDecomposed),
(eComposed, eComposed),
("e", nil),
("\u{301}", nil)
)
firstMatchTests(
#"[e\u{301}]"#,
(eDecomposed, "e"),
(eComposed, nil),
("e", "e"),
("\u{301}", "\u{301}"),
semanticLevel: .unicodeScalar
)
firstMatchTests(
#"[[[e\u{301}]]]"#,
(eDecomposed, eDecomposed),
(eComposed, eComposed),
("e", nil),
("\u{301}", nil)
)
firstMatchTests(
#"[[[e\u{301}]]]"#,
(eDecomposed, "e"),
(eComposed, nil),
("e", "e"),
("\u{301}", "\u{301}"),
semanticLevel: .unicodeScalar
)
firstMatchTests(
#"[👨\u{200D}👩\u{200D}👧\u{200D}👦]"#,
("👨", nil),
("👩", nil),
("👧", nil),
("👦", nil),
("\u{200D}", nil),