Move the line break character handling to a utility class.

Author: xterao

src/main/kotlin/org/domaframework/doma/intellij/common/util/StringUtil.kt

@@ -16,6 +16,8 @@
 package org.domaframework.doma.intellij.common.util
 
 object StringUtil {
+    const val LINE_SEPARATE: String = "\n"
+
     fun getSqlElClassText(text: String): String =
         text
             .substringAfter("@")

src/main/kotlin/org/domaframework/doma/intellij/document/ForItemElementDocumentationProvider.kt

@@ -18,6 +18,7 @@ package org.domaframework.doma.intellij.document
 import com.intellij.lang.documentation.AbstractDocumentationProvider
 import com.intellij.psi.PsiElement
 import com.intellij.psi.util.PsiTreeUtil
+import org.domaframework.doma.intellij.common.util.StringUtil
 import org.domaframework.doma.intellij.document.generator.DocumentDaoParameterGenerator
 import org.domaframework.doma.intellij.document.generator.DocumentStaticFieldGenerator
 import org.domaframework.doma.intellij.psi.SqlElIdExpr
@@ -62,7 +63,7 @@ class ForItemElementDocumentationProvider : AbstractDocumentationProvider() {
 
         generator.generateDocument()
 
-        return result.joinToString("\n")
+        return result.joinToString(StringUtil.LINE_SEPARATE)
     }
 
     override fun generateHoverDoc(
@@ -77,6 +78,6 @@ class ForItemElementDocumentationProvider : AbstractDocumentationProvider() {
         val result: MutableList<String?> = LinkedList<String?>()
         val typeDocument = generateDoc(element, originalElement)
         result.add(typeDocument)
-        return result.joinToString("\n")
+        return result.joinToString(StringUtil.LINE_SEPARATE)
     }
 }

src/main/kotlin/org/domaframework/doma/intellij/formatter/block/comment/SqlBlockCommentBlock.kt

@@ -17,6 +17,7 @@ package org.domaframework.doma.intellij.formatter.block.comment
 
 import com.intellij.lang.ASTNode
 import com.intellij.psi.util.PsiTreeUtil
+import org.domaframework.doma.intellij.common.util.StringUtil
 import org.domaframework.doma.intellij.formatter.block.SqlBlock
 import org.domaframework.doma.intellij.formatter.util.SqlBlockFormattingContext
 
@@ -27,5 +28,6 @@ open class SqlBlockCommentBlock(
         node,
         context,
     ) {
-    override fun isSaveSpace(lastGroup: SqlBlock?): Boolean = PsiTreeUtil.prevLeaf(node.psi)?.text?.contains("\n") == true
+    override fun isSaveSpace(lastGroup: SqlBlock?): Boolean =
+        PsiTreeUtil.prevLeaf(node.psi)?.text?.contains(StringUtil.LINE_SEPARATE) == true
 }

src/main/kotlin/org/domaframework/doma/intellij/formatter/block/comment/SqlDefaultCommentBlock.kt

@@ -18,6 +18,7 @@ package org.domaframework.doma.intellij.formatter.block.comment
 import com.intellij.lang.ASTNode
 import com.intellij.psi.formatter.common.AbstractBlock
 import com.intellij.psi.util.PsiTreeUtil
+import org.domaframework.doma.intellij.common.util.StringUtil
 import org.domaframework.doma.intellij.formatter.block.SqlBlock
 import org.domaframework.doma.intellij.formatter.util.IndentType
 import org.domaframework.doma.intellij.formatter.util.SqlBlockFormattingContext
@@ -60,5 +61,5 @@ abstract class SqlDefaultCommentBlock(
             }
     }
 
-    override fun isSaveSpace(lastGroup: SqlBlock?) = PsiTreeUtil.prevLeaf(node.psi)?.text?.contains("\n") == true
+    override fun isSaveSpace(lastGroup: SqlBlock?) = PsiTreeUtil.prevLeaf(node.psi)?.text?.contains(StringUtil.LINE_SEPARATE) == true
 }

src/main/kotlin/org/domaframework/doma/intellij/formatter/block/comment/SqlElConditionLoopCommentBlock.kt

@@ -22,6 +22,7 @@ import com.intellij.psi.PsiWhiteSpace
 import com.intellij.psi.formatter.common.AbstractBlock
 import com.intellij.psi.util.PsiTreeUtil
 import com.intellij.psi.util.elementType
+import org.domaframework.doma.intellij.common.util.StringUtil
 import org.domaframework.doma.intellij.common.util.TypeUtil
 import org.domaframework.doma.intellij.extension.expr.isConditionOrLoopDirective
 import org.domaframework.doma.intellij.formatter.block.SqlBlock
@@ -108,7 +109,7 @@ class SqlElConditionLoopCommentBlock(
                 // If the child is a condition loop directive, align its indentation with the parent directive
                 child.indent.indentLen = indent.indentLen.plus(2)
             } else if (child is SqlLineCommentBlock) {
-                if (PsiTreeUtil.prevLeaf(child.node.psi, false)?.text?.contains("\n") == true) {
+                if (PsiTreeUtil.prevLeaf(child.node.psi, false)?.text?.contains(StringUtil.LINE_SEPARATE) == true) {
                     child.indent.indentLen = indent.groupIndentLen
                 } else {
                     child.indent.indentLen = 1

src/main/kotlin/org/domaframework/doma/intellij/formatter/builder/SqlCustomSpacingBuilder.kt

@@ -19,6 +19,7 @@ import com.intellij.formatting.ASTBlock
 import com.intellij.formatting.Block
 import com.intellij.formatting.Spacing
 import com.intellij.psi.tree.IElementType
+import org.domaframework.doma.intellij.common.util.StringUtil
 import org.domaframework.doma.intellij.formatter.block.SqlBlock
 import org.domaframework.doma.intellij.formatter.block.SqlRightPatternBlock
 import org.domaframework.doma.intellij.formatter.block.SqlWhitespaceBlock
@@ -79,8 +80,8 @@ class SqlCustomSpacingBuilder {
             null -> return nonSpacing
             is SqlWhitespaceBlock -> {
                 val indentLen: Int = child2.indent.indentLen
-                val afterNewLine = child1.getNodeText().substringAfterLast("\n", "")
-                if (child1.getNodeText().contains("\n")) {
+                val afterNewLine = child1.getNodeText().substringAfterLast(StringUtil.LINE_SEPARATE, "")
+                if (child1.getNodeText().contains(StringUtil.LINE_SEPARATE)) {
                     val currentIndent = afterNewLine.length
                     val newIndent =
                         if (currentIndent != indentLen) {