Ilya Gorbunov
270 lines
9.0 KiB
Kotlin
270 lines
9.0 KiB
Kotlin
/*
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* Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
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* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
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*/
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@file:Suppress("NAMED_ARGUMENTS_NOT_ALLOWED") // for common tests
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package test.text
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import kotlin.test.*
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class RegexTest {
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@Test fun properties() {
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val pattern = "\\s+$"
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val regex1 = Regex(pattern, RegexOption.IGNORE_CASE)
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assertEquals(pattern, regex1.pattern)
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assertEquals(setOf(RegexOption.IGNORE_CASE), regex1.options)
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val options2 = setOf(RegexOption.MULTILINE, RegexOption.IGNORE_CASE)
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val regex2 = Regex(pattern, options2)
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assertEquals(options2, regex2.options)
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}
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@Test fun matchResult() {
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val p = "\\d+".toRegex()
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val input = "123 456 789"
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assertFalse(input matches p)
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assertFalse(p matches input)
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assertTrue(p in input)
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val first = p.find(input)
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assertNotNull(first)
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assertEquals("123", first.value)
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val second1 = first.next()!!
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val second2 = first.next()!!
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assertEquals("456", second1.value)
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assertEquals(second1.value, second2.value)
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assertEquals("56", p.find(input, startIndex = 5)?.value)
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val last = second1.next()!!
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assertEquals("789", last.value)
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val noMatch = last.next()
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assertEquals(null, noMatch)
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assertFailsWith<IndexOutOfBoundsException> { p.find(input, -1) }
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assertFailsWith<IndexOutOfBoundsException> { p.find(input, input.length + 1) }
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assertEquals(null, p.find(input, input.length))
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}
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@Test fun matchIgnoreCase() {
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for (input in listOf("ascii", "shrödinger"))
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assertTrue(input.uppercase().matches(input.lowercase().toRegex(RegexOption.IGNORE_CASE)))
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}
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@Test fun matchSequence() {
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val input = "123 456 789"
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val pattern = "\\d+".toRegex()
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val matches = pattern.findAll(input)
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val values = matches.map { it.value }
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val expected = listOf("123", "456", "789")
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assertEquals(expected, values.toList())
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assertEquals(expected, values.toList(), "running match sequence second time")
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assertEquals(expected.drop(1), pattern.findAll(input, startIndex = 3).map { it.value }.toList())
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assertEquals(listOf(0..2, 4..6, 8..10), matches.map { it.range }.toList())
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assertFailsWith<IndexOutOfBoundsException> { pattern.findAll(input, -1) }
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assertFailsWith<IndexOutOfBoundsException> { pattern.findAll(input, input.length + 1) }
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assertEquals(emptyList(), pattern.findAll(input, input.length).toList())
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}
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@Test fun matchAllSequence() {
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val input = "test"
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val pattern = ".*".toRegex()
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val matches = pattern.findAll(input).toList()
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assertEquals(input, matches[0].value)
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assertEquals(input, matches.joinToString("") { it.value })
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assertEquals(2, matches.size)
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assertEquals("", pattern.findAll(input, input.length).single().value)
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assertEquals("", pattern.find(input, input.length)?.value)
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}
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@Test fun matchGroups() {
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val input = "1a 2b 3c"
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val pattern = "(\\d)(\\w)".toRegex()
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val matches = pattern.findAll(input).toList()
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assertTrue(matches.all { it.groups.size == 3 })
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matches[0].let { m ->
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assertEquals("1a", m.groups[0]?.value)
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assertEquals("1", m.groups[1]?.value)
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assertEquals("a", m.groups[2]?.value)
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assertEquals(listOf("1a", "1", "a"), m.groupValues)
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val (g1, g2) = m.destructured
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assertEquals("1", g1)
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assertEquals("a", g2)
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assertEquals(listOf("1", "a"), m.destructured.toList())
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}
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matches[1].let { m ->
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assertEquals("2b", m.groups[0]?.value)
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assertEquals("2", m.groups[1]?.value)
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assertEquals("b", m.groups[2]?.value)
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assertEquals(listOf("2b", "2", "b"), m.groupValues)
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val (g1, g2) = m.destructured
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assertEquals("2", g1)
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assertEquals("b", g2)
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assertEquals(listOf("2", "b"), m.destructured.toList())
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}
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}
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@Test fun matchOptionalGroup() {
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val pattern = "(hi)|(bye)".toRegex(RegexOption.IGNORE_CASE)
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pattern.find("Hi!")!!.let { m ->
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assertEquals(3, m.groups.size)
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assertEquals("Hi", m.groups[1]?.value)
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assertEquals(null, m.groups[2])
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assertEquals(listOf("Hi", "Hi", ""), m.groupValues)
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val (g1, g2) = m.destructured
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assertEquals("Hi", g1)
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assertEquals("", g2)
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assertEquals(listOf("Hi", ""), m.destructured.toList())
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}
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pattern.find("bye...")!!.let { m ->
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assertEquals(3, m.groups.size)
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assertEquals(null, m.groups[1])
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assertEquals("bye", m.groups[2]?.value)
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assertEquals(listOf("bye", "", "bye"), m.groupValues)
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val (g1, g2) = m.destructured
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assertEquals("", g1)
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assertEquals("bye", g2)
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assertEquals(listOf("", "bye"), m.destructured.toList())
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}
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}
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@Test fun matchMultiline() {
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val regex = "^[a-z]*$".toRegex(setOf(RegexOption.IGNORE_CASE, RegexOption.MULTILINE))
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val matchedValues = regex.findAll("test\n\nLine").map { it.value }.toList()
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assertEquals(listOf("test", "", "Line"), matchedValues)
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}
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@Test fun matchEntire() {
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val regex = "(\\d)(\\w)".toRegex()
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assertNull(regex.matchEntire("1a 2b"))
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assertNotNull(regex.matchEntire("3c")) { m ->
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assertEquals("3c", m.value)
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assertEquals(3, m.groups.size)
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assertEquals(listOf("3c", "3", "c"), m.groups.map { it!!.value })
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}
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}
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@Test fun matchEntireLazyQuantor() {
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val regex = "a+b+?".toRegex()
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val input = StringBuilder("aaaabbbb")
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assertEquals("aaaab", regex.find(input)!!.value)
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assertEquals("aaaabbbb", regex.matchEntire(input)!!.value)
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}
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@Test fun matchAt() {
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val regex = Regex("[a-z][1-5]", RegexOption.IGNORE_CASE)
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val input = "...a4...B1"
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val positions = 0..input.length
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val matchIndices = positions.filter { index -> regex.matchesAt(input, index) }
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assertEquals(listOf(3, 8), matchIndices)
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val reversedIndices = positions.reversed().filter { index -> regex.matchesAt(input, index) }.reversed()
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assertEquals(matchIndices, reversedIndices)
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val matches = positions.mapNotNull { index -> regex.matchAt(input, index)?.let { index to it } }
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assertEquals(matchIndices, matches.map { it.first })
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matches.forEach { (index, match) ->
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assertEquals(index..index + 1, match.range)
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assertEquals(input.substring(match.range), match.value)
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}
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for (index in listOf(-1, input.length + 1)) {
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assertFailsWith<IndexOutOfBoundsException> { regex.matchAt(input, index) }
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assertFailsWith<IndexOutOfBoundsException> { regex.matchesAt(input, index) }
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}
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val anchoringRegex = Regex("^[a-z]")
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assertFalse(anchoringRegex.matchesAt(input, 3))
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assertNull(anchoringRegex.matchAt(input, 3))
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val lookbehindRegex = Regex("(?<=[a-z])\\d")
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assertTrue(lookbehindRegex.matchesAt(input, 4))
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assertNotNull(lookbehindRegex.matchAt(input, 4)).let { match ->
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assertEquals("4", match.value)
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}
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}
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@Test fun escapeLiteral() {
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val literal = """[-\/\\^$*+?.()|[\]{}]"""
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assertTrue(Regex.fromLiteral(literal).matches(literal))
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assertTrue(Regex.escape(literal).toRegex().matches(literal))
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}
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@Test fun replace() {
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val input = "123-456"
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val pattern = "(\\d+)".toRegex()
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assertEquals("(123)-(456)", pattern.replace(input, "($1)"))
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assertEquals("$&-$&", pattern.replace(input, Regex.escapeReplacement("$&")))
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assertEquals("X-456", pattern.replaceFirst(input, "X"))
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}
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@Test fun replaceEvaluator() {
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val input = "/12/456/7890/"
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val pattern = "\\d+".toRegex()
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assertEquals("/2/3/4/", pattern.replace(input, { it.value.length.toString() }))
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}
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@Test fun split() {
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val input = """
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some ${"\t"} word
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split
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""".trim()
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assertEquals(listOf("some", "word", "split"), "\\s+".toRegex().split(input))
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assertEquals(listOf("name", "value=5"), "=".toRegex().split("name=value=5", limit = 2))
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}
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@Test fun splitByEmptyMatch() {
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val input = "test"
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val emptyMatch = "".toRegex()
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assertEquals(input.split(""), input.split(emptyMatch))
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assertEquals(input.split("", limit = 3), input.split(emptyMatch, limit = 3))
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assertEquals("".split(""), "".split(emptyMatch))
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val emptyMatchBeforeT = "(?=t)".toRegex()
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assertEquals(listOf("", "tes", "t"), input.split(emptyMatchBeforeT))
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assertEquals(listOf("", "test"), input.split(emptyMatchBeforeT, limit = 2))
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assertEquals(listOf("", "tee"), "tee".split(emptyMatchBeforeT))
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}
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}
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