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Implement rule
UnnecessaryPartOfBinaryExpression
(#5203)
* Implement check for unnecessary part of binary expression * Update the default config * Fixed import and code style * Fixed import * Fixed ci issues * Update detekt-rules-performance/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/performance/UnnecessaryPartOfBinaryExpression.kt Co-authored-by: Nicola Corti <corti.nico@gmail.com> * Fixed tests Co-authored-by: v.stelmashchuk <volodymyr.stelmashchuk@pm.bet> Co-authored-by: Nicola Corti <corti.nico@gmail.com>
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92 changes: 92 additions & 0 deletions
92
...kotlin/io/gitlab/arturbosch/detekt/rules/performance/UnnecessaryPartOfBinaryExpression.kt
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package io.gitlab.arturbosch.detekt.rules.performance | ||
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import io.gitlab.arturbosch.detekt.api.CodeSmell | ||
import io.gitlab.arturbosch.detekt.api.Config | ||
import io.gitlab.arturbosch.detekt.api.Debt | ||
import io.gitlab.arturbosch.detekt.api.Entity | ||
import io.gitlab.arturbosch.detekt.api.Issue | ||
import io.gitlab.arturbosch.detekt.api.Rule | ||
import io.gitlab.arturbosch.detekt.api.Severity | ||
import org.jetbrains.kotlin.com.intellij.psi.tree.IElementType | ||
import org.jetbrains.kotlin.lexer.KtTokens | ||
import org.jetbrains.kotlin.psi.KtBinaryExpression | ||
import org.jetbrains.kotlin.psi.KtElement | ||
import org.jetbrains.kotlin.psi.KtExpression | ||
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/** | ||
* Unnecessary binary expression add complexity to the code and accomplish nothing. They should be removed. | ||
* The rule works with all binary expression included if and when condition. The rule also works with all predicates. | ||
* The rule verify binary expression only in case when the expression use only one type of the following | ||
* operators || or &&. | ||
* | ||
* <noncompliant> | ||
* val foo = true | ||
* val bar = true | ||
* | ||
* if (foo || bar || foo) { | ||
* } | ||
* </noncompliant> | ||
* | ||
* <compliant> | ||
* val foo = true | ||
* if (foo) { | ||
* } | ||
* </compliant> | ||
* | ||
*/ | ||
class UnnecessaryPartOfBinaryExpression(config: Config = Config.empty) : Rule(config) { | ||
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override val issue: Issue = Issue( | ||
"UnnecessaryPartOfBinaryExpression", | ||
Severity.Performance, | ||
"Detects duplicate condition into binary expression and recommends to remove unnecessary checks", | ||
Debt.FIVE_MINS | ||
) | ||
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override fun visitBinaryExpression(expression: KtBinaryExpression) { | ||
super.visitBinaryExpression(expression) | ||
if (expression.parent is KtBinaryExpression) { | ||
return | ||
} | ||
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val isOrOr = expression.getAllOperations().all { it != KtTokens.OROR } | ||
val isAndAnd = expression.getAllOperations().all { it != KtTokens.ANDAND } | ||
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if (isOrOr || isAndAnd) { | ||
val allChildren = expression.getAllVariables().map { it.text.replace(Regex("\\s"), "") } | ||
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if (allChildren != allChildren.distinct()) { | ||
report(CodeSmell(issue, Entity.from(expression), issue.description)) | ||
} | ||
} | ||
} | ||
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private fun KtBinaryExpression.getAllVariables(): List<KtElement> { | ||
return buildList { | ||
addAll(this@getAllVariables.left?.getVariable().orEmpty()) | ||
addAll(this@getAllVariables.right?.getVariable().orEmpty()) | ||
} | ||
} | ||
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private fun KtExpression.getVariable(): List<KtElement> { | ||
return if (this is KtBinaryExpression && | ||
(this.operationToken == KtTokens.OROR || this.operationToken == KtTokens.ANDAND) | ||
) { | ||
this.getAllVariables() | ||
} else { | ||
listOf(this) | ||
} | ||
} | ||
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private fun KtBinaryExpression.getAllOperations(): List<IElementType> { | ||
return buildList { | ||
(this@getAllOperations.left as? KtBinaryExpression)?.let { | ||
addAll(it.getAllOperations()) | ||
} | ||
(this@getAllOperations.right as? KtBinaryExpression)?.let { | ||
addAll(it.getAllOperations()) | ||
} | ||
add(this@getAllOperations.operationToken) | ||
} | ||
} | ||
} |
268 changes: 268 additions & 0 deletions
268
...in/io/gitlab/arturbosch/detekt/rules/performance/UnnecessaryPartOfBinaryExpressionSpec.kt
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package io.gitlab.arturbosch.detekt.rules.performance | ||
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import io.gitlab.arturbosch.detekt.test.compileAndLint | ||
import org.assertj.core.api.Assertions.assertThat | ||
import org.junit.jupiter.api.Test | ||
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class UnnecessaryPartOfBinaryExpressionSpec { | ||
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@Test | ||
fun `Verify if condition with several arguments`() { | ||
val code = """ | ||
fun bar() { | ||
val foo = true | ||
val baz = false | ||
if (foo || baz || foo) { | ||
//TODO | ||
} | ||
} | ||
""" | ||
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val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(1) | ||
} | ||
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@Test | ||
fun `No report several arguments with object-foo math operator and bool val`() { | ||
val code = """ | ||
class Bar(val bar: Boolean) | ||
fun bar() { | ||
val foo = true | ||
val baz = 10 | ||
val bar = Bar(true) | ||
if (baz < 10 || foo || bar.bar || baz > 10) { | ||
//TODO | ||
} | ||
} | ||
""" | ||
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val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(0) | ||
} | ||
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@Test | ||
fun `Report several arguments with object-foo math operator and bool val`() { | ||
val code = """ | ||
class Bar(val bar: Boolean) | ||
fun bar() { | ||
val foo = true | ||
val baz = 10 | ||
val bar = Bar(true) | ||
if (baz < 10 || foo || bar.bar || baz > 10 || baz < 10) { | ||
//TODO | ||
} | ||
} | ||
""" | ||
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val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(1) | ||
} | ||
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@Test | ||
fun `Not report error if condition contains different operators`() { | ||
val code = """ | ||
fun bar() { | ||
val foo = true | ||
val baz = false | ||
if (foo || baz && foo) { | ||
//TODO | ||
} | ||
} | ||
""" | ||
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val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(0) | ||
} | ||
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@Test | ||
fun `Not report error if condition contains different operators with other binary expression`() { | ||
val code = """ | ||
fun bar() { | ||
val foo = 5 | ||
val baz = false | ||
if (foo < 5 || baz && foo > 5) { | ||
//TODO | ||
} | ||
} | ||
""" | ||
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val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(0) | ||
} | ||
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@Test | ||
fun `verify foo or foo detected`() { | ||
val code = """ | ||
fun bar() { | ||
val foo = true | ||
if (foo || foo) { | ||
//TODO | ||
} | ||
} | ||
""" | ||
val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(1) | ||
} | ||
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@Test | ||
fun `verify object-foo or object-foo or object-bar detected`() { | ||
val code = """ | ||
class Bar(val bar: Boolean, val baz: Boolean) | ||
fun bar() { | ||
val bar = Bar(true, true) | ||
if (bar.bar || bar.baz || bar.bar) { | ||
//TODO | ||
} | ||
} | ||
""" | ||
val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(1) | ||
} | ||
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@Test | ||
fun `verify object-foo or object-foo detected`() { | ||
val code = """ | ||
class Bar(val bar: Boolean) | ||
fun bar() { | ||
val bar = Bar(true) | ||
if (bar.bar || bar.bar) { | ||
//TODO | ||
} | ||
} | ||
""" | ||
val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(1) | ||
} | ||
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@Test | ||
fun `verify foo more 5 and foo more 5 detected`() { | ||
val code = """ | ||
fun bar() { | ||
val foo = 1 | ||
if (foo > 1 && foo > 1) { | ||
//TODO | ||
} | ||
} | ||
""" | ||
val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(1) | ||
} | ||
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@Test | ||
fun `verify foo more 5 && foo more 5 detected un trim`() { | ||
val code = """ | ||
fun bar() { | ||
val foo = 1 | ||
if (foo> 1 && foo >1) { | ||
//TODO | ||
} | ||
} | ||
""" | ||
val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(1) | ||
} | ||
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@Test | ||
fun `verify object-foo && object-foo detected`() { | ||
val code = """ | ||
class Bar(val bar: Boolean) | ||
fun bar() { | ||
val bar = Bar(true) | ||
if (bar.bar && bar.bar) { | ||
//TODO | ||
} | ||
} | ||
""" | ||
val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(1) | ||
} | ||
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@Test | ||
fun `verify foo does not report`() { | ||
val code = """ | ||
fun bar() { | ||
val foo = true | ||
if (foo) { | ||
//TODO | ||
} | ||
} | ||
""" | ||
val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(0) | ||
} | ||
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@Test | ||
fun `verify more and less if works as expected`() { | ||
val code = """ | ||
fun bar() { | ||
val foo = 0 | ||
val bar = 1 | ||
if (foo > bar || foo > 1) { | ||
//TODO | ||
} | ||
} | ||
""" | ||
val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(0) | ||
} | ||
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@Test | ||
fun `verify into filter function`() { | ||
val code = """ | ||
fun bar() { | ||
val list = listOf<Int>() | ||
list.filter { it > 1 || it > 1 } | ||
} | ||
""" | ||
val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(1) | ||
} | ||
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@Test | ||
fun `verify into when`() { | ||
val code = """ | ||
fun bar() { | ||
val foo = true | ||
when { | ||
foo || foo -> { | ||
} | ||
} | ||
} | ||
""" | ||
val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(1) | ||
} | ||
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@Test | ||
fun `verify two or into when`() { | ||
val code = """ | ||
fun bar() { | ||
val foo = true | ||
val bar = true | ||
when { | ||
foo || bar || foo -> { | ||
} | ||
} | ||
} | ||
""" | ||
val findings = UnnecessaryPartOfBinaryExpression().compileAndLint(code) | ||
assertThat(findings).hasSize(1) | ||
} | ||
} |