feat: Word#flatMapParts & Word#partsInNotation

src/main/kotlin/Word.kt

@@ -28,6 +28,17 @@ class Word(val parts: Sequence<String>) {
 	 */
 	fun mapParts(transform: (String) -> String) = Word(parts.map(transform))
 
+	/**
+	 * Creates a new word, with all its parts transformed by the provided [transform] function, which may return more than one new part for
+	 * every existing part.
+	 */
+	fun flatMapParts(transform: (String) -> Sequence<String>) = Word(parts.flatMap(transform))
+
+	/**
+	 * Creates a new words, with all its parts parsed by the provided [notation]. Allows to parse words that use a combination of notations.
+	 */
+	fun partsFromNotation(notation: StringNotation) = Word(parts.flatMap { it.fromNotation(notation).parts })
+
 	/**
 	 * Appends a part to this word.
 	 */
@@ -39,6 +50,10 @@ class Word(val parts: Sequence<String>) {
 	operator fun plus(word: Word) = Word(parts + word.parts)
 
 	override fun toString() = "Word(${parts.joinToString { "\"$it\"" }})"
+
+	override fun equals(other: Any?) = this === other || (other is Word && partsList == other.partsList)
+
+	override fun hashCode() = partsList.hashCode()
 }
 
 /**

src/test/kotlin/WordTest.kt

@@ -3,10 +3,27 @@ package de.joshuagleitze.stringnotation
 import ch.tutteli.atrium.api.fluent.en_GB.asIterable
 import ch.tutteli.atrium.api.fluent.en_GB.containsExactly
 import ch.tutteli.atrium.api.fluent.en_GB.feature
+import ch.tutteli.atrium.api.fluent.en_GB.notToBe
+import ch.tutteli.atrium.api.fluent.en_GB.toBe
 import ch.tutteli.atrium.api.verbs.expect
 import org.junit.jupiter.api.Test
 
 class WordTest {
+	@Test
+	fun `implements #equals`() {
+		val aInstance = Word("a")
+		expect(aInstance).toBe(aInstance)
+		expect(aInstance).toBe(Word("a"))
+		expect(Word("a")).notToBe(Word("A"))
+	}
+
+	@Test
+	fun `implements #hashCode`() {
+		expect(Word("a"))
+			.feature(Word::hashCode)
+			.toBe(Word("a").hashCode())
+	}
+
 	@Test
 	fun `exposes parts as list`() {
 		expect(Word("with", "parts")).feature(Word::partsList).containsExactly("with", "parts")
@@ -24,22 +41,34 @@ class WordTest {
 	@Test
 	fun `allows to add parts`() {
 		expect((Word("with") + "more" + "parts"))
-			.feature(Word::partsList)
-			.containsExactly("with", "more", "parts")
+			.toBe(Word("with", "more", "parts"))
 	}
 
 	@Test
 	fun `allows to add words`() {
 		expect(Word("with") + Word("more", "parts"))
-			.feature(Word::partsList)
-			.containsExactly("with", "more", "parts")
+			.toBe(Word("with", "more", "parts"))
 	}
 
 	@Test
-	fun `allows to transform parts`() {
+	fun `allows to map parts`() {
 		expect(Word("a", "b", "c"))
 			.feature(Word::mapParts, String::toUpperCase)
-			.feature(Word::partsList)
-			.containsExactly("A", "B", "C");
+			.toBe(Word("A", "B", "C"))
+	}
+
+	@Test
+	fun `allows to flatMap parts`() {
+		expect(Word("a", "b"))
+			.feature(Word::flatMapParts) { it -> sequenceOf("${it}1", "${it}2") }
+			.toBe(Word("a1", "a2", "b1", "b2"))
+	}
+
+	@Test
+	fun `allows to parse parts from a notation`() {
+		expect("these are words with UpperCamelCase")
+			.feature(String::fromNotation, NormalWords)
+			.feature(Word::partsFromNotation, UpperCamelCase)
+			.toBe(Word("these", "are", "words", "with", "upper", "camel", "case"))
 	}
 }