fix(devins-lang): remove unused imports and refactor compiler creation logic

The commit removes unused `com.intellij.openapi.editor.Editor` and `com.intellij.psi.PsiFile` imports and refactors the compiler creation logic into a private function `createCompiler` for better code readability and maintainability.

Author: phodal

exts/devins-lang/src/main/kotlin/cc/unitmesh/devti/language/provider/DevInsCustomAgentResponse.kt

@@ -5,11 +5,9 @@ import cc.unitmesh.devti.language.compiler.DevInsCompiler
 import cc.unitmesh.devti.language.psi.DevInFile
 import cc.unitmesh.devti.provider.devins.CustomAgentContext
 import cc.unitmesh.devti.provider.devins.LanguagePromptProcessor
-import com.intellij.openapi.editor.Editor
 import com.intellij.openapi.fileEditor.FileEditorManager
 import com.intellij.openapi.project.Project
 import com.intellij.psi.PsiElement
-import com.intellij.psi.PsiFile
 import com.intellij.psi.PsiWhiteSpace
 import com.intellij.psi.util.PsiUtilBase
 
@@ -18,46 +16,54 @@ class DevInsCustomAgentResponse : LanguagePromptProcessor {
     override val name: String = "DevIn"
 
     override fun execute(project: Project, context: CustomAgentContext): String {
-        val devInFile = DevInFile.fromString(project, context.response)
-        val devInsCompiler = DevInsCompiler(project, devInFile)
+        val devInsCompiler = createCompiler(project, context.response)
 
         val result = devInsCompiler.compile()
         AutoDevNotifications.notify(project, result.output)
         return result.output
     }
 
-    private fun getCurrentPsiFile(project: Project, editor: Editor): PsiFile? {
-        return PsiUtilBase.getPsiFileInEditor(editor, project)
-    }
-
-    private fun getElementAtOffset(psiFile: PsiElement, offset: Int): PsiElement? {
-        // 获取偏移量对应的元素
-        var element = psiFile.findElementAt(offset) ?: return null
+    override fun compile(project: Project, text: String): String {
+        val devInsCompiler = createCompiler(project, text)
 
-        // 如果元素是空白元素，尝试获取其父元素
-        if (element is PsiWhiteSpace) {
-            element = element.getParent()
+        val result = devInsCompiler.compile()
+        return if (result.hasError || result.isLocalCommand) {
+            text
+        } else {
+            result.output
         }
-
-        return element
     }
 
-    override fun compile(project: Project, text: String): String {
+    /**
+     * Creates a new instance of `DevInsCompiler`.
+     *
+     * @param project The current project.
+     * @param text The source code text.
+     * @return A new instance of `DevInsCompiler`.
+     */
+    private fun createCompiler(
+        project: Project,
+        text: String
+    ): DevInsCompiler {
         val devInFile = DevInFile.fromString(project, text)
         val editor = FileEditorManager.getInstance(project).selectedTextEditor
         val element: PsiElement? = editor?.caretModel?.currentCaret?.offset?.let {
-            val psiFile = getCurrentPsiFile(project, editor) ?: return@let null
+            val psiFile = PsiUtilBase.getPsiFileInEditor(editor, project) ?: return@let null
             getElementAtOffset(psiFile, it)
         }
 
         val devInsCompiler = DevInsCompiler(project, devInFile, editor, element)
+        return devInsCompiler
+    }
 
-        val result = devInsCompiler.compile()
-        return if (result.hasError || result.isLocalCommand) {
-            text
-        } else {
-            result.output
+    private fun getElementAtOffset(psiFile: PsiElement, offset: Int): PsiElement? {
+        var element = psiFile.findElementAt(offset) ?: return null
+
+        if (element is PsiWhiteSpace) {
+            element = element.getParent()
         }
+
+        return element
     }
 }