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c2bc72d9d6
* [stdlib] Fix String.UTF16View index sharing * [stdlib] Fix String.UnicodeScalarView index sharing * [stdlib] Fix String.CharacterView index sharing * [stdlib] Test advancing string indices past their ends * [stdlib] Simplify CharacterView ranged subscript
118 lines
3.4 KiB
Swift
118 lines
3.4 KiB
Swift
// RUN: %target-run-simple-swift
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// REQUIRES: executable_test
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import StdlibUnittest
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var SubstringTests = TestSuite("SubstringTests")
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func checkMatch<S: Collection, T: Collection>(_ x: S, _ y: T, _ i: S.Index)
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where S.Index == T.Index, S.Iterator.Element == T.Iterator.Element,
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S.Iterator.Element: Equatable
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{
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expectEqual(x[i], y[i])
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}
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SubstringTests.test("String") {
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let s = "abcdefg"
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let s1 = s[s.index(s.startIndex, offsetBy: 2) ..<
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s.index(s.startIndex, offsetBy: 4)]
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let s2 = s1[s1.startIndex..<s1.endIndex]
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let s3 = s2[s1.startIndex..<s1.endIndex]
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expectEqual(s1, "cd")
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expectEqual(s2, "cd")
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expectEqual(s3, "cd")
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}
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SubstringTests.test("CharacterView") {
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let s = "abcdefg"
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var t = s.characters.dropFirst(2)
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var u = t.dropFirst(2)
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checkMatch(s.characters, t, t.startIndex)
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checkMatch(s.characters, t, t.index(after: t.startIndex))
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checkMatch(s.characters, t, t.index(before: t.endIndex))
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checkMatch(s.characters, t, u.startIndex)
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checkMatch(t, u, u.startIndex)
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checkMatch(t, u, u.index(after: u.startIndex))
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checkMatch(t, u, u.index(before: u.endIndex))
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expectEqual("", String(t.dropFirst(10)))
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expectEqual("", String(t.dropLast(10)))
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expectEqual("", String(u.dropFirst(10)))
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expectEqual("", String(u.dropLast(10)))
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t.replaceSubrange(t.startIndex...t.startIndex, with: ["C"])
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u.replaceSubrange(u.startIndex...u.startIndex, with: ["E"])
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expectEqual(String(u), "Efg")
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expectEqual(String(t), "Cdefg")
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expectEqual(s, "abcdefg")
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}
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SubstringTests.test("UnicodeScalars") {
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let s = "abcdefg"
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var t = s.unicodeScalars.dropFirst(2)
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var u = t.dropFirst(2)
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checkMatch(s.unicodeScalars, t, t.startIndex)
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checkMatch(s.unicodeScalars, t, t.index(after: t.startIndex))
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checkMatch(s.unicodeScalars, t, t.index(before: t.endIndex))
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checkMatch(s.unicodeScalars, t, u.startIndex)
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checkMatch(t, u, u.startIndex)
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checkMatch(t, u, u.index(after: u.startIndex))
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checkMatch(t, u, u.index(before: u.endIndex))
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expectEqual("", String(t.dropFirst(10)))
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expectEqual("", String(t.dropLast(10)))
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expectEqual("", String(u.dropFirst(10)))
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expectEqual("", String(u.dropLast(10)))
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t.replaceSubrange(t.startIndex...t.startIndex, with: ["C"])
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u.replaceSubrange(u.startIndex...u.startIndex, with: ["E"])
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expectEqual(String(u), "Efg")
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expectEqual(String(t), "Cdefg")
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expectEqual(s, "abcdefg")
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}
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SubstringTests.test("UTF16View") {
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let s = "abcdefg"
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let t = s.utf16.dropFirst(2)
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let u = t.dropFirst(2)
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checkMatch(s.utf16, t, t.startIndex)
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checkMatch(s.utf16, t, t.index(after: t.startIndex))
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checkMatch(s.utf16, t, t.index(before: t.endIndex))
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checkMatch(s.utf16, t, u.startIndex)
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checkMatch(t, u, u.startIndex)
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checkMatch(t, u, u.index(after: u.startIndex))
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checkMatch(t, u, u.index(before: u.endIndex))
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expectEqual("", String(t.dropFirst(10))!)
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expectEqual("", String(t.dropLast(10))!)
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expectEqual("", String(u.dropFirst(10))!)
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expectEqual("", String(u.dropLast(10))!)
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}
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SubstringTests.test("UTF8View") {
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let s = "abcdefg"
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let t = s.utf8.dropFirst(2)
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let u = t.dropFirst(2)
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checkMatch(s.utf8, t, t.startIndex)
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checkMatch(s.utf8, t, t.index(after: t.startIndex))
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checkMatch(s.utf8, t, u.startIndex)
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checkMatch(t, u, u.startIndex)
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checkMatch(t, u, u.index(after: u.startIndex))
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expectEqual("", String(t.dropFirst(10))!)
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expectEqual("", String(t.dropLast(10))!)
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expectEqual("", String(u.dropFirst(10))!)
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expectEqual("", String(u.dropLast(10))!)
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}
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runAllTests()
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