feat(completion): add DevInCompletionContributor and remove deprecate…

…d TypedHandler from plugin.xml #101

The `DevInCompletionContributor` class has been added to provide code completion functionality for the DevIn language. This includes the `VariableProvider` class to suggest variables during code completion. Additionally, the deprecated `TypedHandler` has been commented out and a new `completion.contributor` extension has been added to the plugin descriptor (`cc.unitmesh.language.xml`) to register the new completion contributor.

exts/devin-lang/src/main/kotlin/cc/unitmesh/language/DevInCompletionContributor.kt

@@ -0,0 +1,13 @@
+package cc.unitmesh.language
+
+import cc.unitmesh.language.completion.VariableProvider
+import cc.unitmesh.language.psi.DevInTypes
+import com.intellij.codeInsight.completion.CompletionContributor
+import com.intellij.codeInsight.completion.CompletionType
+import com.intellij.patterns.PlatformPatterns.psiElement
+
+class DevInCompletionContributor : CompletionContributor() {
+    init {
+        extend(CompletionType.BASIC, psiElement(DevInTypes.IDENTIFIER), VariableProvider())
+    }
+}

exts/devin-lang/src/main/kotlin/cc/unitmesh/language/completion/VariableProvider.kt

@@ -0,0 +1,19 @@
+package cc.unitmesh.language.completion
+
+import com.intellij.codeInsight.completion.CompletionParameters
+import com.intellij.codeInsight.completion.CompletionProvider
+import com.intellij.codeInsight.completion.CompletionResultSet
+import com.intellij.util.ProcessingContext
+
+class VariableProvider: CompletionProvider<CompletionParameters>() {
+    override fun addCompletions(
+        parameters: CompletionParameters,
+        context: ProcessingContext,
+        result: CompletionResultSet,
+    ) {
+//        CustomVariable.all.forEach {
+//            result.addElement(it.toLookupElement())
+//        }
+    }
+
+}

exts/devin-lang/src/main/resources/cc.unitmesh.language.xml

@@ -11,6 +11,9 @@
         <lang.ast.factory language="DevIn"
                           implementationClass="cc.unitmesh.language.DevInAstFactory"/>
 
-        <typedHandler implementation="cc.unitmesh.language.DevInTypedHandler"/>
+<!--        <typedHandler implementation="cc.unitmesh.language.DevInTypedHandler"/>-->
+
+        <completion.contributor language="DevIn"
+                                implementationClass="cc.unitmesh.language.DevInCompletionContributor"/>
     </extensions>
 </idea-plugin>