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Replace all function bodies with body expressions in a single run #2395

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Dec 2, 2023
Merged

Replace all function bodies with body expressions in a single run #2395

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10 changes: 6 additions & 4 deletions ...src/main/kotlin/com/pinterest/ktlint/ruleset/standard/rules/FunctionExpressionBodyRule.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -23,7 +23,8 @@ import com.pinterest.ktlint.rule.engine.core.api.editorconfig.INDENT_STYLE_PROPE
import com.pinterest.ktlint.rule.engine.core.api.editorconfig.MAX_LINE_LENGTH_PROPERTY
import com.pinterest.ktlint.rule.engine.core.api.firstChildLeafOrSelf
import com.pinterest.ktlint.rule.engine.core.api.isWhiteSpace
import com.pinterest.ktlint.rule.engine.core.api.leavesIncludingSelf
import com.pinterest.ktlint.rule.engine.core.api.lastChildLeafOrSelf
import com.pinterest.ktlint.rule.engine.core.api.leavesInClosedRange
import com.pinterest.ktlint.rule.engine.core.api.nextSibling
import com.pinterest.ktlint.rule.engine.core.api.prevSibling
import com.pinterest.ktlint.ruleset.standard.StandardRule
Expand Down Expand Up @@ -111,7 +112,7 @@ public class FunctionExpressionBodyRule :
require(block.elementType == BLOCK)
block
.takeIf { it.containingOnly(RETURN) }
?.takeUnless { it.containsMultipleReturns() }
?.takeUnless { it.countReturnKeywords() > 1 }
?.findChildByType(RETURN)
?.findChildByType(RETURN_KEYWORD)
?.nextSibling { !it.isWhiteSpace() }
Expand Down Expand Up @@ -164,8 +165,9 @@ public class FunctionExpressionBodyRule :
.singleOrNull()
?.elementType

private fun ASTNode.containsMultipleReturns() =
firstChildLeafOrSelf().leavesIncludingSelf().count { it.elementType == RETURN_KEYWORD } > 1
private fun ASTNode.countReturnKeywords() =
leavesInClosedRange(this.firstChildLeafOrSelf(), this.lastChildLeafOrSelf())
.count { it.elementType == RETURN_KEYWORD }

private fun ASTNode.createUnitTypeReference() =
PsiFileFactory
Expand Down
24 changes: 24 additions & 0 deletions ...test/kotlin/com/pinterest/ktlint/ruleset/standard/rules/FunctionExpressionBodyRuleTest.kt
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
package com.pinterest.ktlint.ruleset.standard.rules

import com.pinterest.ktlint.test.KtLintAssertThat.Companion.assertThatRule
import com.pinterest.ktlint.test.LintViolation
import org.junit.jupiter.api.Test
import org.junit.jupiter.params.ParameterizedTest
import org.junit.jupiter.params.provider.ValueSource
Expand Down Expand Up @@ -168,4 +169,27 @@ class FunctionExpressionBodyRuleTest {
""".trimIndent()
functionExpressionBodyRule(code).hasNoLintViolations()
}

@Test
fun `Issue 2394 - Given multiple function bodies with a single return statement`() {
val code =
"""
fun foo1(): String {
return "foo1"
}
fun foo2(): String {
return "foo2"
}
""".trimIndent()
val formattedCode =
"""
fun foo1(): String = "foo1"
fun foo2(): String = "foo2"
""".trimIndent()
functionExpressionBodyRule(code)
.hasLintViolations(
LintViolation(1, 20, "Function body should be replaced with body expression"),
LintViolation(4, 20, "Function body should be replaced with body expression"),
).isFormattedAs(formattedCode)
}
}