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Validation for capitalizeFirstChar #14

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Validation for capitalizeFirstChar #14

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b28eea4
check conditions added to capitalizeFirstChar
pvs1209pvs Jun 19, 2023
034011b
Merge branch 'Carleslc:master' into master
pvs1209pvs Jun 19, 2023
00eaad3
String.capitalizeFirstChar takes in multiple and single spaces and th…
pvs1209pvs Jul 19, 2023
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23 changes: 16 additions & 7 deletions src/main/kotlin/me/carleslc/kotlinextensions/strings/StringsExtensions.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ import com.cesarferreira.pluralize.pluralize
import com.cesarferreira.pluralize.singularize
import com.google.common.base.Strings
import me.carleslc.kotlinextensions.standard.letOrElse
import java.lang.IllegalArgumentException
import java.util.*

inline infix operator fun String.times(n: Int): String = Strings.repeat(this, n)
Expand Down Expand Up @@ -49,16 +50,24 @@ inline fun String.replace(ignoreCase: Boolean = false, vararg vars: Pair<String,
inline fun String.remove(substring: String) = replace(substring, "")

/**
* Capitalizes first character of every word.
* Words are separated by one of more space characters.
* Capitalized the first character of every word where word is delimited by a space character.
*/
inline fun String.capitalizeFirstChar() =
lowercase(Locale.getDefault())
.split(" +".toRegex())
.joinToString(" ", "") { d ->
d.replaceRange(0, 1, d.first().uppercaseChar().toString())
fun String.capitalizeFirstChar(saveSpacing: Boolean = true): String {

if (isEmpty() || isBlank()) throw IllegalArgumentException("Blank or empty String cannot be used.")

val deliminator = if (saveSpacing) " " else " +"

return this
.lowercase(Locale.getDefault())
.split(deliminator.toRegex())
.joinToString(" ") {
if (it.isEmpty()) it
else it.replaceRange(0, 1, it.first().uppercaseChar().toString())
}

}

/**
* Removes non-numerical characters from a string.
*/
Expand Down
33 changes: 22 additions & 11 deletions src/test/kotlin/me/carleslc/kotlinextensions/strings/StringsExtensionsKtTest.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ import org.junit.jupiter.api.Assertions
import org.junit.jupiter.api.BeforeAll
import org.junit.jupiter.api.Test
import strings.*
import java.lang.IllegalArgumentException
import java.util.*

class StringsExtensionsKtTest {
Expand Down Expand Up @@ -189,17 +190,27 @@ class StringsExtensionsKtTest {
@Test
fun capitalizeFirstCharTest() {

val expected = "Petro Canada"

val result1 = "petro canada".capitalizeFirstChar()
val result2 = "PETRO CANADA".capitalizeFirstChar()
val result3 = "PEtRO CAnaDA".capitalizeFirstChar()
val result4 = "pEtRO cAnaDA".capitalizeFirstChar()

Assertions.assertEquals(expected, result1)
Assertions.assertEquals(expected, result2)
Assertions.assertEquals(expected, result3)
Assertions.assertEquals(expected, result4)
val result1 = "aa bb cc dd".capitalizeFirstChar()
val result2 = "aa bb cc dd".capitalizeFirstChar()
val result3 = " aa bb ".capitalizeFirstChar()
val result4 = " aa bb ".capitalizeFirstChar()
val result5 = "aa bb cc dd".capitalizeFirstChar(false)
val result6 = "aa bb cc dd".capitalizeFirstChar(false)
val result7 = " aa bb ".capitalizeFirstChar(false)
val result8 = " aa bb ".capitalizeFirstChar(false)

Assertions.assertEquals("Aa Bb Cc Dd", result1)
Assertions.assertEquals("Aa Bb Cc Dd", result2)
Assertions.assertEquals(" Aa Bb ", result3)
Assertions.assertEquals(" Aa Bb ", result4)
Assertions.assertEquals("Aa Bb Cc Dd", result5)
Assertions.assertEquals("Aa Bb Cc Dd", result6)
Assertions.assertEquals(" Aa Bb ", result7)
Assertions.assertEquals(" Aa Bb ", result8)

Assertions.assertThrows(IllegalArgumentException::class.java) { "".capitalizeFirstChar() }
Assertions.assertThrows(IllegalArgumentException::class.java) { " ".capitalizeFirstChar() }
Assertions.assertThrows(IllegalArgumentException::class.java) { " ".capitalizeFirstChar() }

}

Expand Down