Scaffold out semantic token support

Author: fwcd

server/src/main/kotlin/org/javacs/kt/KotlinLanguageServer.kt

@@ -14,6 +14,7 @@ import org.javacs.kt.util.TemporaryDirectory
 import org.javacs.kt.util.parseURI
 import org.javacs.kt.progress.Progress
 import org.javacs.kt.progress.LanguageClientProgress
+import org.javacs.kt.semantictokens.semanticTokensLegend
 import java.net.URI
 import java.io.Closeable
 import java.nio.file.Paths
@@ -81,6 +82,7 @@ class KotlinLanguageServer : LanguageServer, LanguageClientAware, Closeable {
         serverCapabilities.documentSymbolProvider = Either.forLeft(true)
         serverCapabilities.workspaceSymbolProvider = Either.forLeft(true)
         serverCapabilities.referencesProvider = Either.forLeft(true)
+        serverCapabilities.semanticTokensProvider = SemanticTokensWithRegistrationOptions(semanticTokensLegend, true)
         serverCapabilities.codeActionProvider = Either.forLeft(true)
         serverCapabilities.documentFormattingProvider = Either.forLeft(true)
         serverCapabilities.documentRangeFormattingProvider = Either.forLeft(true)

server/src/main/kotlin/org/javacs/kt/KotlinTextDocumentService.kt

@@ -223,7 +223,12 @@ class KotlinTextDocumentService(
                 val offset = offset(content, position.position.line, position.position.character)
                 findReferences(file, offset, sp)
             }
-        }
+    }
+
+    override fun semanticTokensFull(params: SemanticTokensParams) = async.compute {
+        // TODO
+        SemanticTokens(listOf())
+    }
 
     override fun resolveCodeLens(unresolved: CodeLens): CompletableFuture<CodeLens> {
         TODO("not implemented")

server/src/main/kotlin/org/javacs/kt/semantictokens/SemanticTokens.kt

@@ -0,0 +1,30 @@
+package org.javacs.kt.semantictokens
+
+import org.eclipse.lsp4j.SemanticTokenTypes
+import org.eclipse.lsp4j.SemanticTokenModifiers
+import org.eclipse.lsp4j.SemanticTokensLegend
+import org.eclipse.lsp4j.Range
+import org.jetbrains.kotlin.psi.KtElement
+
+private enum class SemanticTokenType(val typeName: String) {
+    VARIABLE(SemanticTokenTypes.Variable),
+    PROPERTY(SemanticTokenTypes.Property),
+    ENUM_MEMBER(SemanticTokenTypes.EnumMember)
+}
+
+private enum class SemanticTokenModifier(val modifierName: String) {
+    DECLARATION(SemanticTokenModifiers.Declaration),
+    DEFINITION(SemanticTokenModifiers.Definition)
+}
+
+val semanticTokensLegend = SemanticTokensLegend(
+    SemanticTokenType.values().map { it.typeName },
+    SemanticTokenModifier.values().map { it.modifierName }
+)
+
+private data class SemanticToken(val range: Range, val type: SemanticTokenType, val modifiers: Set<SemanticTokenModifier>)
+
+private fun semanticTokens(element: KtElement): List<Int> {
+    return listOf() // TODO
+}
+