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Ignore modifier of backing property in
android_studio code style (#…
…2552) Extract `backing-property-name` from `property-naming` rule. This allows users to disable this rule, but keep the `property-naming` rule in place. For `android_studio` code style the restrictions regarding the modifier of the correlated property or function is ignored entirely as the Android Kotlin Styleguide does not require it to be public. Closes #2528
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133
.../src/main/kotlin/com/pinterest/ktlint/ruleset/standard/rules/BackingPropertyNamingRule.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| package com.pinterest.ktlint.ruleset.standard.rules | ||
|
|
||
| import com.pinterest.ktlint.rule.engine.core.api.ElementType.FUN | ||
| import com.pinterest.ktlint.rule.engine.core.api.ElementType.IDENTIFIER | ||
| import com.pinterest.ktlint.rule.engine.core.api.ElementType.INTERNAL_KEYWORD | ||
| import com.pinterest.ktlint.rule.engine.core.api.ElementType.PRIVATE_KEYWORD | ||
| import com.pinterest.ktlint.rule.engine.core.api.ElementType.PROPERTY | ||
| import com.pinterest.ktlint.rule.engine.core.api.ElementType.PROTECTED_KEYWORD | ||
| import com.pinterest.ktlint.rule.engine.core.api.ElementType.VALUE_PARAMETER | ||
| import com.pinterest.ktlint.rule.engine.core.api.ElementType.VALUE_PARAMETER_LIST | ||
| import com.pinterest.ktlint.rule.engine.core.api.RuleId | ||
| import com.pinterest.ktlint.rule.engine.core.api.SinceKtlint | ||
| import com.pinterest.ktlint.rule.engine.core.api.SinceKtlint.Status.EXPERIMENTAL | ||
| import com.pinterest.ktlint.rule.engine.core.api.children | ||
| import com.pinterest.ktlint.rule.engine.core.api.editorconfig.CODE_STYLE_PROPERTY | ||
| import com.pinterest.ktlint.rule.engine.core.api.editorconfig.CodeStyleValue.android_studio | ||
| import com.pinterest.ktlint.rule.engine.core.api.editorconfig.EditorConfig | ||
| import com.pinterest.ktlint.rule.engine.core.api.hasModifier | ||
| import com.pinterest.ktlint.ruleset.standard.StandardRule | ||
| import com.pinterest.ktlint.ruleset.standard.rules.internal.regExIgnoringDiacriticsAndStrokesOnLetters | ||
| import org.jetbrains.kotlin.com.intellij.lang.ASTNode | ||
|
|
||
| /** | ||
| * https://kotlinlang.org/docs/coding-conventions.html#property-names | ||
| * https://developer.android.com/kotlin/style-guide#backing_properties | ||
| */ | ||
| @SinceKtlint("1.2.0", EXPERIMENTAL) | ||
| public class BackingPropertyNamingRule : | ||
| StandardRule( | ||
| id = "backing-property-naming", | ||
| usesEditorConfigProperties = setOf(CODE_STYLE_PROPERTY), | ||
| ) { | ||
| private var codeStyle = CODE_STYLE_PROPERTY.defaultValue | ||
|
|
||
| override fun beforeFirstNode(editorConfig: EditorConfig) { | ||
| codeStyle = editorConfig[CODE_STYLE_PROPERTY] | ||
| } | ||
|
|
||
| override fun beforeVisitChildNodes( | ||
| node: ASTNode, | ||
| autoCorrect: Boolean, | ||
| emit: (offset: Int, errorMessage: String, canBeAutoCorrected: Boolean) -> Unit, | ||
| ) { | ||
| node | ||
| .takeIf { node.elementType == PROPERTY } | ||
| ?.let { property -> visitProperty(property, emit) } | ||
| } | ||
|
|
||
| private fun visitProperty( | ||
| property: ASTNode, | ||
| emit: (offset: Int, errorMessage: String, canBeAutoCorrected: Boolean) -> Unit, | ||
| ) { | ||
| property | ||
| .findChildByType(IDENTIFIER) | ||
| ?.takeIf { it.text.startsWith("_") } | ||
| ?.let { identifier -> | ||
| visitBackingProperty(identifier, emit) | ||
| } | ||
| } | ||
|
|
||
| private fun visitBackingProperty( | ||
| identifier: ASTNode, | ||
| emit: (offset: Int, errorMessage: String, canBeAutoCorrected: Boolean) -> Unit, | ||
| ) { | ||
| identifier | ||
| .text | ||
| .takeUnless { it.matches(BACKING_PROPERTY_LOWER_CAMEL_CASE_REGEXP) } | ||
| ?.let { | ||
| emit(identifier.startOffset, "Backing property should start with underscore followed by lower camel case", false) | ||
| } | ||
|
|
||
| if (!identifier.treeParent.hasModifier(PRIVATE_KEYWORD)) { | ||
| emit(identifier.startOffset, "Backing property not allowed when 'private' modifier is missing", false) | ||
| } | ||
|
|
||
| // A backing property can only exist when a correlated public property or function exists | ||
| val correlatedPropertyOrFunction = identifier.findCorrelatedPropertyOrFunction() | ||
| if (correlatedPropertyOrFunction == null) { | ||
| emit(identifier.startOffset, "Backing property is only allowed when a matching property or function exists", false) | ||
| } else { | ||
| if (codeStyle == android_studio || correlatedPropertyOrFunction.isPublic()) { | ||
| return | ||
| } else { | ||
| emit(identifier.startOffset, "Backing property is only allowed when the matching property or function is public", false) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private fun ASTNode.findCorrelatedPropertyOrFunction() = findCorrelatedProperty() ?: findCorrelatedFunction() | ||
|
|
||
| private fun ASTNode.findCorrelatedProperty() = | ||
| treeParent | ||
| ?.treeParent | ||
| ?.children() | ||
| ?.filter { it.elementType == PROPERTY } | ||
| ?.mapNotNull { it.findChildByType(IDENTIFIER) } | ||
| ?.firstOrNull { it.text == text.removePrefix("_") } | ||
| ?.treeParent | ||
|
|
||
| private fun ASTNode.findCorrelatedFunction(): ASTNode? { | ||
| val correlatedFunctionName = "get${capitalizeFirstChar()}" | ||
| return treeParent | ||
| ?.treeParent | ||
| ?.children() | ||
| ?.filter { it.elementType == FUN } | ||
| ?.filter { it.hasNonEmptyParameterList() } | ||
| ?.mapNotNull { it.findChildByType(IDENTIFIER) } | ||
| ?.firstOrNull { it.text == correlatedFunctionName } | ||
| ?.treeParent | ||
| } | ||
|
|
||
| private fun ASTNode.hasNonEmptyParameterList() = | ||
| findChildByType(VALUE_PARAMETER_LIST) | ||
| ?.children() | ||
| ?.none { it.elementType == VALUE_PARAMETER } | ||
| ?: false | ||
|
|
||
| private fun ASTNode.capitalizeFirstChar() = | ||
| text | ||
| .removePrefix("_") | ||
| .replaceFirstChar { it.uppercase() } | ||
|
|
||
| private fun ASTNode.isPublic() = | ||
| !hasModifier(PRIVATE_KEYWORD) && | ||
| !hasModifier(PROTECTED_KEYWORD) && | ||
| !hasModifier(INTERNAL_KEYWORD) | ||
|
|
||
| private companion object { | ||
| val BACKING_PROPERTY_LOWER_CAMEL_CASE_REGEXP = "_[a-z][a-zA-Z0-9]*".regExIgnoringDiacriticsAndStrokesOnLetters() | ||
| } | ||
| } | ||
|
|
||
| public val BACKING_PROPERTY_NAMING_RULE_ID: RuleId = BackingPropertyNamingRule().ruleId |
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