Repository: analysis-dev/diktat (kotlin)

Issue:
Comments should be indented as the code they are commenting
For example,
```kotlin
foo
     // we are calling bar
    .bar
```
is corrected to
```kotlin
foo
// we are calling bar
    .bar
```
in diktat 0.1.5

Pull request description:
### What's done:
  * Fixed bugs

This pull request closes #553

Patch:
diff --git a/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/utils/indentation/Checkers.kt b/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/utils/indentation/Checkers.kt
index 1f4859c707..04edf11d74 100644
--- a/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/utils/indentation/Checkers.kt
+++ b/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/utils/indentation/Checkers.kt
@@ -4,12 +4,14 @@ import com.pinterest.ktlint.core.ast.ElementType.ARROW
 import com.pinterest.ktlint.core.ast.ElementType.AS_KEYWORD
 import com.pinterest.ktlint.core.ast.ElementType.AS_SAFE
 import com.pinterest.ktlint.core.ast.ElementType.BINARY_EXPRESSION
+import com.pinterest.ktlint.core.ast.ElementType.BLOCK_COMMENT
 import com.pinterest.ktlint.core.ast.ElementType.BODY
 import com.pinterest.ktlint.core.ast.ElementType.CALL_EXPRESSION
 import com.pinterest.ktlint.core.ast.ElementType.COLON
 import com.pinterest.ktlint.core.ast.ElementType.DOT
 import com.pinterest.ktlint.core.ast.ElementType.ELSE
 import com.pinterest.ktlint.core.ast.ElementType.ELVIS
+import com.pinterest.ktlint.core.ast.ElementType.EOL_COMMENT
 import com.pinterest.ktlint.core.ast.ElementType.EQ
 import com.pinterest.ktlint.core.ast.ElementType.IS_EXPRESSION
 import com.pinterest.ktlint.core.ast.ElementType.KDOC_END
@@ -174,13 +176,25 @@ internal class DotCallChecker(config: IndentationConfig) : CustomIndentationChec
     private fun ASTNode.isDotBeforeCallOrReference() = elementType.let { it == DOT || it == SAFE_ACCESS } &&
             treeNext.elementType.let { it == CALL_EXPRESSION || it == REFERENCE_EXPRESSION }
 
+    private fun ASTNode.isCommentBeforeDot() : Boolean {
+        if (elementType == EOL_COMMENT || elementType == BLOCK_COMMENT) {
+            var nextNode = treeNext
+            while (nextNode != null && (nextNode.elementType == WHITE_SPACE || nextNode.elementType == EOL_COMMENT)) {
+                nextNode = nextNode.treeNext
+            }
+            return nextNode.isDotBeforeCallOrReference()
+        }
+        return false
+    }
+
+    @Suppress("ComplexMethod")
     override fun checkNode(whiteSpace: PsiWhiteSpace, indentError: IndentationError): CheckResult? {
         whiteSpace.nextSibling.node
                 .takeIf { nextNode ->
                     nextNode.isDotBeforeCallOrReference() ||
                             nextNode.elementType == OPERATION_REFERENCE && nextNode.firstChildNode.elementType.let {
                                 it == ELVIS || it == IS_EXPRESSION || it == AS_KEYWORD || it == AS_SAFE
-                            }
+                            } || nextNode.isCommentBeforeDot()
                 }
                 ?.let {
                     // we need to get indent before the first expression in calls chain


Test patch:
diff --git a/diktat-rules/src/test/resources/test/smoke/src/main/kotlin/Example4Expected.kt b/diktat-rules/src/test/resources/test/smoke/src/main/kotlin/Example4Expected.kt
index cab9a2e5d2..88d0e2e229 100644
--- a/diktat-rules/src/test/resources/test/smoke/src/main/kotlin/Example4Expected.kt
+++ b/diktat-rules/src/test/resources/test/smoke/src/main/kotlin/Example4Expected.kt
@@ -22,5 +22,13 @@ fun `method name incorrect, part 4`() {
                   }
                 """.trimIndent()
     lintMethod(code, LintError(2, 7, ruleId, "${FUNCTION_NAME_INCORRECT_CASE.warnText()} methODTREE", true))
+
+    foo
+            // we are calling bar
+            .bar()
+
+    bar
+            /* This is a block comment */
+            .foo()
 }
 
diff --git a/diktat-rules/src/test/resources/test/smoke/src/main/kotlin/Example4Test.kt b/diktat-rules/src/test/resources/test/smoke/src/main/kotlin/Example4Test.kt
index 4ccb47ed9b..0b4819e80b 100644
--- a/diktat-rules/src/test/resources/test/smoke/src/main/kotlin/Example4Test.kt
+++ b/diktat-rules/src/test/resources/test/smoke/src/main/kotlin/Example4Test.kt
@@ -21,5 +21,13 @@ fun `method name incorrect, part 4`() {
                   }
                 """.trimIndent()
     lintMethod(code, LintError(2, 7, ruleId, "${FUNCTION_NAME_INCORRECT_CASE.warnText()} methODTREE", true))
+
+    foo
+                // we are calling bar
+            .bar()
+
+    bar
+                /* This is a block comment */
+            .foo()
 }