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• 0.31.0
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• NoLineBreakAfterElseRule.kt

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com.github.shyiko.ktlint.ruleset.standard.NoLineBreakAfterElseRule.kt Maven / Gradle / Ivy

package com.github.shyiko.ktlint.ruleset.standard

import com.github.shyiko.ktlint.core.Rule
import com.github.shyiko.ktlint.core.ast.ElementType.ELSE_KEYWORD
import com.github.shyiko.ktlint.core.ast.ElementType.IF_KEYWORD
import com.github.shyiko.ktlint.core.ast.ElementType.LBRACE
import com.github.shyiko.ktlint.core.ast.nextLeaf
import com.github.shyiko.ktlint.core.ast.prevLeaf
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

class NoLineBreakAfterElseRule : Rule("no-line-break-after-else") {

    override fun visit(
        node: ASTNode,
        autoCorrect: Boolean,
        emit: (offset: Int, errorMessage: String, canBeAutoCorrected: Boolean) -> Unit
    ) {
        if (node is PsiWhiteSpace &&
            node.textContains('\n')
        ) {
            if (node.prevLeaf()?.elementType == ELSE_KEYWORD &&
                node.nextLeaf()?.elementType.let { it == IF_KEYWORD || it == LBRACE }
            ) {
                emit(node.startOffset + 1, "Unexpected line break after \"else\"", true)
                if (autoCorrect) {
                    (node as LeafPsiElement).rawReplaceWithText(" ")
                }
            }
        }
    }
}