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Add
function-type-modifier-spacing rule (pinterest#2216)
Closes pinterest#2202 Co-authored-by: paul-dingemans <paul-dingemans@users.noreply.github.com>
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44 changes: 44 additions & 0 deletions
44
...ain/kotlin/com/pinterest/ktlint/ruleset/standard/rules/FunctionTypeModifierSpacingRule.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| package com.pinterest.ktlint.ruleset.standard.rules | ||
|
|
||
| import com.pinterest.ktlint.rule.engine.core.api.ElementType.FUNCTION_TYPE | ||
| import com.pinterest.ktlint.rule.engine.core.api.ElementType.MODIFIER_LIST | ||
| import com.pinterest.ktlint.rule.engine.core.api.ElementType.WHITE_SPACE | ||
| import com.pinterest.ktlint.rule.engine.core.api.Rule | ||
| import com.pinterest.ktlint.rule.engine.core.api.RuleId | ||
| import com.pinterest.ktlint.rule.engine.core.api.nextCodeSibling | ||
| import com.pinterest.ktlint.rule.engine.core.api.prevSibling | ||
| import com.pinterest.ktlint.rule.engine.core.api.upsertWhitespaceBeforeMe | ||
| import com.pinterest.ktlint.ruleset.standard.StandardRule | ||
| import org.jetbrains.kotlin.com.intellij.lang.ASTNode | ||
|
|
||
| /** | ||
| * Lints and formats a single space between the modifier list and the function type | ||
| */ | ||
| public class FunctionTypeModifierSpacingRule : | ||
| StandardRule("function-type-modifier-spacing"), | ||
| Rule.Experimental { | ||
| override fun beforeVisitChildNodes( | ||
| node: ASTNode, | ||
| autoCorrect: Boolean, | ||
| emit: (offset: Int, errorMessage: String, canBeAutoCorrected: Boolean) -> Unit, | ||
| ) { | ||
| node | ||
| .takeIf { it.elementType == MODIFIER_LIST } | ||
| ?.nextCodeSibling() | ||
| ?.takeIf { it.elementType == FUNCTION_TYPE } | ||
| ?.takeUnless { it.isPrecededBySingleSpace() } | ||
| ?.let { functionTypeNode -> | ||
| emit(functionTypeNode.startOffset, "Expected a single space between the modifier list and the function type", true) | ||
| if (autoCorrect) { | ||
| functionTypeNode.upsertWhitespaceBeforeMe(" ") | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private fun ASTNode.isPrecededBySingleSpace(): Boolean = | ||
| prevSibling() | ||
| ?.let { it.elementType == WHITE_SPACE && it.text == " " } | ||
| ?: false | ||
| } | ||
|
|
||
| public val FUNCTION_TYPE_MODIFIER_SPACING_RULE: RuleId = FunctionTypeModifierSpacingRule().ruleId |
135 changes: 135 additions & 0 deletions
135
...kotlin/com/pinterest/ktlint/ruleset/standard/rules/FunctionTypeModifierSpacingRuleTest.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| package com.pinterest.ktlint.ruleset.standard.rules | ||
|
|
||
| import com.pinterest.ktlint.test.KtLintAssertThat.Companion.assertThatRule | ||
| import org.junit.jupiter.api.Nested | ||
| import org.junit.jupiter.api.Test | ||
|
|
||
| class FunctionTypeModifierSpacingRuleTest { | ||
| private val assertThatRule = assertThatRule { FunctionTypeModifierSpacingRule() } | ||
|
|
||
| @Nested | ||
| inner class `Missing space before the function type` { | ||
| @Test | ||
| fun `Given no space between the modifier list and the function property type`() { | ||
| val code = | ||
| """ | ||
| val foo: suspend() -> Unit = {} | ||
| """.trimIndent() | ||
| val formattedCode = | ||
| """ | ||
| val foo: suspend () -> Unit = {} | ||
| """.trimIndent() | ||
| assertThatRule(code) | ||
| .hasLintViolation(1, 17, "Expected a single space between the modifier list and the function type") | ||
| .isFormattedAs(formattedCode) | ||
| } | ||
|
|
||
| @Test | ||
| fun `Given no space between the modifier list and the function parameter type`() { | ||
| val code = | ||
| """ | ||
| suspend fun bar(baz: suspend() -> Unit) = baz() | ||
| """.trimIndent() | ||
| val formattedCode = | ||
| """ | ||
| suspend fun bar(baz: suspend () -> Unit) = baz() | ||
| """.trimIndent() | ||
| assertThatRule(code) | ||
| .hasLintViolation(1, 29, "Expected a single space between the modifier list and the function type") | ||
| .isFormattedAs(formattedCode) | ||
| } | ||
| } | ||
|
|
||
| @Nested | ||
| inner class `Exactly one space before the function type` { | ||
| @Test | ||
| fun `Given a single space between the modifier list and the function property type`() { | ||
| val code = | ||
| """ | ||
| val foo: suspend () -> Unit = {} | ||
| """.trimIndent() | ||
| assertThatRule(code).hasNoLintViolations() | ||
| } | ||
|
|
||
| @Test | ||
| fun `Given a single space between the modifier list and the function parameter type`() { | ||
| val code = | ||
| """ | ||
| suspend fun bar(baz: suspend () -> Unit) = baz() | ||
| """.trimIndent() | ||
| assertThatRule(code).hasNoLintViolations() | ||
| } | ||
| } | ||
|
|
||
| @Nested | ||
| inner class `Too many spaces before the function type` { | ||
| @Test | ||
| fun `Given multiple spaces between the modifier list and the function property type`() { | ||
| val code = | ||
| """ | ||
| val foo: suspend () -> Unit = {} | ||
| """.trimIndent() | ||
| val formattedCode = | ||
| """ | ||
| val foo: suspend () -> Unit = {} | ||
| """.trimIndent() | ||
| assertThatRule(code) | ||
| .hasLintViolation(1, 19, "Expected a single space between the modifier list and the function type") | ||
| .isFormattedAs(formattedCode) | ||
| } | ||
|
|
||
| @Test | ||
| fun `Given multiple spaces between the modifier list and the function parameter type`() { | ||
| val code = | ||
| """ | ||
| suspend fun bar(baz: suspend () -> Unit) = baz() | ||
| """.trimIndent() | ||
| val formattedCode = | ||
| """ | ||
| suspend fun bar(baz: suspend () -> Unit) = baz() | ||
| """.trimIndent() | ||
| assertThatRule(code) | ||
| .hasLintViolation(1, 33, "Expected a single space between the modifier list and the function type") | ||
| .isFormattedAs(formattedCode) | ||
| } | ||
| } | ||
|
|
||
| @Nested | ||
| inner class `Given unexpected newline before the function type` { | ||
| @Test | ||
| fun `Given unexpected newline between the modifier list and the function property type`() { | ||
| val code = | ||
| """ | ||
| val foo: suspend | ||
| () -> Unit = {} | ||
| """.trimIndent() | ||
| val formattedCode = | ||
| """ | ||
| val foo: suspend () -> Unit = {} | ||
| """.trimIndent() | ||
| assertThatRule(code) | ||
| .hasLintViolation(2, 10, "Expected a single space between the modifier list and the function type") | ||
| .isFormattedAs(formattedCode) | ||
| } | ||
|
|
||
| @Test | ||
| fun `Given unexpected newline between the modifier list and the function parameter type`() { | ||
| val code = | ||
| """ | ||
| suspend fun bar( | ||
| baz: suspend | ||
| () -> Unit | ||
| ) = baz() | ||
| """.trimIndent() | ||
| val formattedCode = | ||
| """ | ||
| suspend fun bar( | ||
| baz: suspend () -> Unit | ||
| ) = baz() | ||
| """.trimIndent() | ||
| assertThatRule(code) | ||
| .hasLintViolation(3, 10, "Expected a single space between the modifier list and the function type") | ||
| .isFormattedAs(formattedCode) | ||
| } | ||
| } | ||
| } |