Added M68kIncludeFileProvider, but dunno what it's actually for.

src/main/java/de/platon42/intellij/plugins/m68k/M68kFileElementType.kt

@@ -10,7 +10,7 @@ class M68kFileElementType private constructor() : ILightStubFileElementType<PsiF
         @JvmField
         val INSTANCE = M68kFileElementType()
 
-        const val STUB_VERSION = 5
+        const val STUB_VERSION = 6
         const val STUB_EXTERNAL_ID_PREFIX = "MC68000."
         const val EXTERNAL_ID = STUB_EXTERNAL_ID_PREFIX + "FILE"
     }

src/main/java/de/platon42/intellij/plugins/m68k/lexer/LexerUtil.kt

@@ -72,4 +72,13 @@ object LexerUtil {
         lexer.yybegin(_M68kLexer.MACROLINE)
         return TokenType.WHITE_SPACE
     }
+
+    fun unquoteString(string: String) = string.run {
+        when {
+            startsWith('"') -> removeSurrounding("\"")
+            startsWith('\'') -> removeSurrounding("'")
+            startsWith('<') -> removeSurrounding("<", ">")
+            else -> this
+        }
+    }
 }

src/main/java/de/platon42/intellij/plugins/m68k/m68k.bnf

@@ -173,7 +173,9 @@ AsmOp ::= MNEMONIC OperandSize? {
     methods = [getMnemonic getOpSize]
 }
 
-PreprocessorDirective ::= Label? (DATA_DIRECTIVE | OTHER_DIRECTIVE)
+PreprocessorKeyword ::= (DATA_DIRECTIVE | OTHER_DIRECTIVE)
+
+PreprocessorDirective ::= Label? PreprocessorKeyword
         PreprocessorOperands?
 
 MacroPlainLine ::= MACRO_LINE

src/main/java/de/platon42/intellij/plugins/m68k/psi/M68kLiteralExprMixin.kt

@@ -2,21 +2,13 @@ package de.platon42.intellij.plugins.m68k.psi
 
 import com.intellij.extapi.psi.ASTWrapperPsiElement
 import com.intellij.lang.ASTNode
+import de.platon42.intellij.plugins.m68k.lexer.LexerUtil
 
 abstract class M68kLiteralExprMixin(node: ASTNode) : ASTWrapperPsiElement(node), M68kLiteralExpr {
     override fun getValue(): Any? {
         val childNode = firstChild.node
         when (childNode.elementType) {
-            M68kTypes.STRINGLIT -> {
-                return text.run {
-                    when {
-                        startsWith('"') -> removeSurrounding("\"")
-                        startsWith('\'') -> removeSurrounding("'")
-                        startsWith('<') -> removeSurrounding(">")
-                        else -> this
-                    }
-                }
-            }
+            M68kTypes.STRINGLIT -> LexerUtil.unquoteString(childNode.text)
             M68kTypes.DECIMAL -> {
                 try {
                     return childNode.text.toInt()
@@ -46,6 +38,6 @@ abstract class M68kLiteralExprMixin(node: ASTNode) : ASTWrapperPsiElement(node),
                 }
             }
         }
-        return text
+        return childNode.text
     }
 }

src/main/java/de/platon42/intellij/plugins/m68k/scanner/M68kIncludeFileProvider.kt

@@ -0,0 +1,59 @@
+package de.platon42.intellij.plugins.m68k.scanner
+
+import com.intellij.openapi.fileTypes.FileType
+import com.intellij.openapi.fileTypes.FileTypeRegistry
+import com.intellij.openapi.vfs.VirtualFile
+import com.intellij.psi.impl.include.FileIncludeInfo
+import com.intellij.psi.impl.include.FileIncludeProvider
+import com.intellij.psi.impl.source.tree.LightTreeUtil
+import com.intellij.util.Consumer
+import com.intellij.util.PathUtilRt
+import com.intellij.util.indexing.FileContent
+import com.intellij.util.indexing.PsiDependentFileContent
+import de.platon42.intellij.plugins.m68k.M68kFileType.Companion.INSTANCE
+import de.platon42.intellij.plugins.m68k.lexer.LexerUtil
+import de.platon42.intellij.plugins.m68k.psi.M68kTypes
+
+class M68kIncludeFileProvider : FileIncludeProvider() {
+
+    override fun getId(): String {
+        return "mc68000_include"
+    }
+
+    override fun acceptFile(file: VirtualFile): Boolean {
+        return FileTypeRegistry.getInstance().isFileOfType(file, INSTANCE)
+    }
+
+    override fun registerFileTypesUsedForIndexing(fileTypeSink: Consumer<in FileType?>) {
+        fileTypeSink.consume(INSTANCE)
+    }
+
+    override fun getIncludeInfos(content: FileContent): Array<FileIncludeInfo> {
+        if (content.contentAsText.indexOfAny(listOf("include", "incbin"), ignoreCase = true) < 0) return emptyArray()
+
+        val tree = (content as PsiDependentFileContent).lighterAST
+        val statements = LightTreeUtil.getChildrenOfType(tree, tree.root, M68kTypes.STATEMENT).asSequence()
+            .mapNotNull { LightTreeUtil.firstChildOfType(tree, it, M68kTypes.PREPROCESSOR_DIRECTIVE) }
+            .mapNotNull {
+                val keywordNode = LightTreeUtil.firstChildOfType(tree, it, M68kTypes.PREPROCESSOR_KEYWORD) ?: return@mapNotNull null
+                val keyword = LightTreeUtil.toFilteredString(tree, keywordNode, null)
+                if (keyword.equals("include", true) || keyword.equals("incbin", true)) {
+                    keyword to it
+                } else {
+                    null
+                }
+            }
+            .mapNotNull {
+                val pathNode = LightTreeUtil.firstChildOfType(tree, it.second, M68kTypes.LITERAL_EXPR) ?: return@mapNotNull null
+                val path = LexerUtil.unquoteString(LightTreeUtil.toFilteredString(tree, pathNode, null)).replace("\\", "/")
+                if (it.first.equals("include", true)) {
+                    FileIncludeInfo(path)
+                } else {
+                    FileIncludeInfo(PathUtilRt.getFileName(path), path, 0, true)
+                }
+            }
+            .toList()
+
+        return statements.toTypedArray()
+    }
+}