Added simple custom navigation bar.

src/main/java/de/platon42/intellij/plugins/m68k/navigation/M68kStructureAwareNavbar.kt

@@ -0,0 +1,75 @@
+package de.platon42.intellij.plugins.m68k.navigation
+
+import com.intellij.ide.navigationToolbar.AbstractNavBarModelExtension
+import com.intellij.ide.ui.UISettings
+import com.intellij.openapi.actionSystem.CommonDataKeys
+import com.intellij.openapi.actionSystem.DataContext
+import com.intellij.openapi.project.IndexNotReadyException
+import com.intellij.psi.PsiElement
+import com.intellij.psi.util.PsiTreeUtil
+import de.platon42.intellij.plugins.m68k.M68kIcons
+import de.platon42.intellij.plugins.m68k.MC68000Language
+import de.platon42.intellij.plugins.m68k.psi.*
+import de.platon42.intellij.plugins.m68k.psi.utils.M68kPsiWalkUtil.findStatementForElement
+import org.jetbrains.annotations.Nullable
+import javax.swing.Icon
+
+class M68kStructureAwareNavbar : AbstractNavBarModelExtension() {
+
+    override fun getLeafElement(dataContext: DataContext): PsiElement? {
+        if (UISettings.getInstance().showMembersInNavigationBar) {
+            val psiFile = CommonDataKeys.PSI_FILE.getData(dataContext)
+            val editor = CommonDataKeys.EDITOR.getData(dataContext)
+            if (psiFile == null || !psiFile.isValid || editor == null) return null
+            val psiElement = psiFile.findElementAt(editor.caretModel.offset)
+            if (isAcceptableLanguage(psiElement)) {
+                try {
+                    var statement = findStatementForElement(psiElement!!) ?: return null
+                    do {
+                        if (statement.localLabel != null) return statement.localLabel
+                        if (statement.globalLabel != null) return statement.globalLabel
+                        statement = PsiTreeUtil.getPrevSiblingOfType(statement, M68kStatement::class.java) ?: return null
+                    } while (true)
+                } catch (ignored: IndexNotReadyException) {
+                }
+            }
+        }
+        return null
+    }
+
+    private fun isAcceptableLanguage(psiElement: @Nullable PsiElement?) = psiElement?.language == MC68000Language.INSTANCE
+
+    override fun getPresentableText(obj: Any?): String? {
+        return when (obj) {
+            is M68kFile -> obj.name
+            is M68kGlobalLabel -> obj.name
+            is M68kLocalLabel -> obj.name
+            is M68kSymbolDefinition -> obj.name
+            is M68kMacroDefinition -> obj.macroNameDefinition.text
+            else -> null
+        }
+    }
+
+    override fun getParent(psiElement: PsiElement): PsiElement? {
+        if (!isAcceptableLanguage(psiElement)) return null
+        var statement = findStatementForElement(psiElement) ?: return null
+        if (statement.localLabel != null) {
+            do {
+                if (statement.globalLabel != null) return statement.globalLabel
+                statement = PsiTreeUtil.getPrevSiblingOfType(statement, M68kStatement::class.java) ?: return null
+            } while (true)
+        }
+        return psiElement.containingFile
+    }
+
+    override fun getIcon(obj: Any?): Icon? {
+        return when (obj) {
+            is M68kFile -> M68kIcons.FILE
+            is M68kGlobalLabel -> M68kIcons.GLOBAL_LABEL
+            is M68kLocalLabel -> M68kIcons.LOCAL_LABEL
+            is M68kSymbolDefinition -> M68kIcons.SYMBOL_DEF
+            is M68kMacroDefinition -> M68kIcons.MACRO_DEF
+            else -> null
+        }
+    }
+}

src/main/java/de/platon42/intellij/plugins/m68k/psi/utils/M68kPsiWalkUtil.kt

@@ -5,7 +5,9 @@ import com.intellij.psi.PsiElement
 import com.intellij.psi.util.PsiTreeUtil
 import com.intellij.util.SmartList
 import com.intellij.util.containers.addIfNotNull
+import de.platon42.intellij.plugins.m68k.psi.M68kFile
 import de.platon42.intellij.plugins.m68k.psi.M68kMacroDefinition
+import de.platon42.intellij.plugins.m68k.psi.M68kStatement
 
 object M68kPsiWalkUtil {
 
@@ -28,4 +30,12 @@ object M68kPsiWalkUtil {
 
         return comments.reversed()
     }
+
+    fun findStatementForElement(psiElement: PsiElement): M68kStatement? {
+        if (psiElement is M68kStatement) return psiElement
+        if (psiElement.parent is M68kFile) {
+            return PsiTreeUtil.getPrevSiblingOfType(psiElement, M68kStatement::class.java)
+        }
+        return PsiTreeUtil.getParentOfType(psiElement, M68kStatement::class.java);
+    }
 }

src/main/resources/META-INF/plugin.xml

@@ -21,6 +21,7 @@
                                implementationClass="de.platon42.intellij.plugins.m68k.parser.M68kParserDefinition"/>
         <lang.syntaxHighlighterFactory language="MC68000"
                                        implementationClass="de.platon42.intellij.plugins.m68k.syntax.M68kSyntaxHighlighterFactory"/>
+        <navbar implementation="de.platon42.intellij.plugins.m68k.navigation.M68kStructureAwareNavbar"/>
         <highlightVisitor implementation="de.platon42.intellij.plugins.m68k.syntax.M68kRainbowVisitor"/>
         <colorSettingsPage implementation="de.platon42.intellij.plugins.m68k.syntax.M68kColorSettingsPage"/>
         <completion.contributor language="MC68000" implementationClass="de.platon42.intellij.plugins.m68k.asm.M68kMnemonicCompletionContributor"/>