Implement definition request for BibTeX entries

src/main/kotlin/texlab/TextDocumentServiceImpl.kt

@@ -10,10 +10,7 @@ import texlab.completion.latex.*
 import texlab.completion.latex.data.LatexComponentDatabase
 import texlab.completion.latex.data.LatexComponentDatabaseListener
 import texlab.completion.latex.data.LatexResolver
-import texlab.definition.AggregateDefinitionProvider
-import texlab.definition.DefinitionProvider
-import texlab.definition.DefinitionRequest
-import texlab.definition.LatexLabelDefinitionProvider
+import texlab.definition.*
 import texlab.folding.*
 import texlab.link.AggregateLinkProvider
 import texlab.link.LatexIncludeLinkProvider
@@ -92,7 +89,10 @@ class TextDocumentServiceImpl(private val workspace: Workspace) : TextDocumentSe
 
     private val linkProvider: LinkProvider = AggregateLinkProvider(LatexIncludeLinkProvider)
 
-    private val definitionProvider: DefinitionProvider = AggregateDefinitionProvider(LatexLabelDefinitionProvider)
+    private val definitionProvider: DefinitionProvider =
+            AggregateDefinitionProvider(
+                    LatexLabelDefinitionProvider,
+                    BibtexEntryDefinitionProvider)
 
     override fun didOpen(params: DidOpenTextDocumentParams) {
         params.textDocument.apply {

src/main/kotlin/texlab/definition/BibtexEntryDefinitionProvider.kt

@@ -0,0 +1,30 @@
+package texlab.definition
+
+import org.eclipse.lsp4j.Location
+import texlab.BibtexDocument
+import texlab.LatexDocument
+import texlab.contains
+import texlab.syntax.bibtex.BibtexEntrySyntax
+
+object BibtexEntryDefinitionProvider : DefinitionProvider {
+    override fun find(request: DefinitionRequest): Location? {
+        if (request.document !is LatexDocument) {
+            return null
+        }
+
+        val reference = request.document.tree.citations
+                .firstOrNull { it.name.range.contains(request.position) } ?: return null
+
+        for (document in request.relatedDocuments.filterIsInstance<BibtexDocument>()) {
+            val definition = document.tree.root.children
+                    .filterIsInstance<BibtexEntrySyntax>()
+                    .firstOrNull { it.name?.text == reference.name.text }
+            if (definition?.name != null) {
+                return Location(document.uri.toString(), definition.name.range)
+            }
+
+        }
+
+        return null
+    }
+}

src/main/kotlin/texlab/rename/BibtexEntryRenamer.kt

@@ -40,8 +40,7 @@ object BibtexEntryRenamer : Renamer {
     }
 
     private fun findEntry(document: BibtexDocument, position: Position): Token? {
-        return document.tree.root
-                .descendants()
+        return document.tree.root.children
                 .filterIsInstance<BibtexEntrySyntax>()
                 .firstOrNull { it.name != null && it.name.range.contains(position) }?.name
     }