Merge branches 'all-language-features' and 'package-name-completion'

PRs #205 and #207

Author: fwcd

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

@@ -102,7 +102,9 @@ private class CompilationEnvironment(
             // Not to be confused with the CompilerConfiguration in the language server Configuration
             configuration = KotlinCompilerConfiguration().apply {
                 val langFeatures = mutableMapOf<LanguageFeature, LanguageFeature.State>()
-                langFeatures[LanguageFeature.MultiPlatformProjects] = LanguageFeature.State.ENABLED
+                for (langFeature in LanguageFeature.values()) {
+                    langFeatures[langFeature] = LanguageFeature.State.ENABLED
+                }
                 val languageVersionSettings = LanguageVersionSettingsImpl(
                     LanguageVersion.LATEST_STABLE,
                     ApiVersion.createByLanguageVersion(LanguageVersion.LATEST_STABLE),

server/src/main/kotlin/org/javacs/kt/completion/Completions.kt

@@ -141,6 +141,8 @@ private fun completableElement(file: CompiledFile, cursor: Int): KtElement? {
     val el = file.parseAtPoint(cursor - 1) ?: return null
             // import x.y.?
     return el.findParent<KtImportDirective>()
+            // package x.y.?
+            ?: el.findParent<KtPackageDirective>()
             // :?
             ?: el.parent as? KtTypeElement
             // .?
@@ -168,6 +170,18 @@ private fun elementCompletions(file: CompiledFile, cursor: Int, surroundingEleme
             val parentPackage = module.getPackage(FqName.fromSegments(parent.split('.')))
             parentPackage.memberScope.getContributedDescriptors().asSequence()
         }
+        // package x.y.?
+        is KtPackageDirective -> {
+            LOG.info("Completing package '{}'", surroundingElement.text)
+            val module = file.container.get<ModuleDescriptor>()
+            val match = Regex("package ((\\w+\\.)*)[\\w*]*").matchEntire(surroundingElement.text)
+                ?: return doesntLookLikePackage(surroundingElement)
+            val parentDot = if (match.groupValues[1].isNotBlank()) match.groupValues[1] else "."
+            val parent = parentDot.substring(0, parentDot.length - 1)
+            LOG.debug("Looking for members of package '{}'", parent)
+            val parentPackage = module.getPackage(FqName.fromSegments(parent.split('.')))
+            parentPackage.memberScope.getDescriptorsFiltered(DescriptorKindFilter.PACKAGES).asSequence()
+        }
         // :?
         is KtTypeElement -> {
             // : Outer.?
@@ -474,6 +488,12 @@ private fun doesntLookLikeImport(importDirective: KtImportDirective): Sequence<D
     return emptySequence()
 }
 
+private fun doesntLookLikePackage(packageDirective: KtPackageDirective): Sequence<DeclarationDescriptor> {
+    LOG.debug("{} doesn't look like package a.b...", packageDirective.text)
+
+    return emptySequence()
+}
+
 private fun empty(message: String): CompletionList {
     LOG.debug(message)