com.pinterest.ktlint.ruleset.standard.rules.SpacingAroundDoubleColonRule.kt Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of ktlint-ruleset-standard Show documentation
An anti-bikeshedding Kotlin linter with built-in formatter.
There is a newer version: 1.5.0
Show newest version
package com.pinterest.ktlint.ruleset.standard.rules

import com.pinterest.ktlint.rule.engine.core.api.ElementType.CALLABLE_REFERENCE_EXPRESSION
import com.pinterest.ktlint.rule.engine.core.api.ElementType.CLASS_LITERAL_EXPRESSION
import com.pinterest.ktlint.rule.engine.core.api.ElementType.COLONCOLON
import com.pinterest.ktlint.rule.engine.core.api.RuleId
import com.pinterest.ktlint.rule.engine.core.api.isPartOf
import com.pinterest.ktlint.rule.engine.core.api.nextLeaf
import com.pinterest.ktlint.rule.engine.core.api.prevLeaf
import com.pinterest.ktlint.ruleset.standard.StandardRule
import org.jetbrains.kotlin.com.intellij.lang.ASTNode
import org.jetbrains.kotlin.com.intellij.psi.PsiWhiteSpace
import org.jetbrains.kotlin.com.intellij.psi.impl.source.tree.LeafPsiElement

public class SpacingAroundDoubleColonRule : StandardRule("double-colon-spacing") {
    override fun beforeVisitChildNodes(
        node: ASTNode,
        autoCorrect: Boolean,
        emit: (offset: Int, errorMessage: String, canBeAutoCorrected: Boolean) -> Unit,
    ) {
        if (node.elementType == COLONCOLON) {
            val prevLeaf = node.prevLeaf()
            val nextLeaf = node.nextLeaf()

            var removeSingleWhiteSpace = false
            val spacingBefore =
                when {
                    node.isPartOf(CLASS_LITERAL_EXPRESSION) && prevLeaf is PsiWhiteSpace -> true // Clazz::class
                    node.isPartOf(CALLABLE_REFERENCE_EXPRESSION) && prevLeaf is PsiWhiteSpace -> // String::length, ::isOdd
                        if (node.treePrev == null) { // compose(length, ::isOdd), val predicate = ::isOdd
                            removeSingleWhiteSpace = true
                            !prevLeaf.textContains('\n') && prevLeaf.psi.textLength > 1
                        } else { // String::length, List::isEmpty
                            !prevLeaf.textContains('\n')
                        }
                    else -> false
                }
            val spacingAfter = nextLeaf is PsiWhiteSpace
            when {
                spacingBefore && spacingAfter -> {
                    emit(node.startOffset, "Unexpected spacing around \"${node.text}\"", true)
                    if (autoCorrect) {
                        prevLeaf!!.removeSelf(removeSingleWhiteSpace)
                        nextLeaf!!.treeParent.removeChild(nextLeaf)
                    }
                }
                spacingBefore -> {
                    emit(prevLeaf!!.startOffset, "Unexpected spacing before \"${node.text}\"", true)
                    if (autoCorrect) {
                        prevLeaf.removeSelf(removeSingleWhiteSpace)
                    }
                }
                spacingAfter -> {
                    emit(nextLeaf!!.startOffset, "Unexpected spacing after \"${node.text}\"", true)
                    if (autoCorrect) {
                        nextLeaf.treeParent.removeChild(nextLeaf)
                    }
                }
            }
        }
    }

    private fun ASTNode.removeSelf(removeSingleWhiteSpace: Boolean) {
        if (removeSingleWhiteSpace) {
            (this as LeafPsiElement).rawReplaceWithText(text.substring(0, textLength - 1))
        } else {
            treeParent.removeChild(this)
        }
    }
}

public val SPACING_AROUND_DOUBLE_COLON_RULE_ID: RuleId = SpacingAroundDoubleColonRule().ruleId