[clangd] Pull CodeCompletionString handling logic into its own file and add unit test.

Reviewers: sammccall

Subscribers: klimek, mgorny, ilya-biryukov, cfe-commits

Differential Revision: https://reviews.llvm.org/D41450

llvm-svn: 321193

1 files changed, 142 insertions, 0 deletions

diff --git a/clang-tools-extra/unittests/clangd/CodeCompletionStringsTests.cpp b/clang-tools-extra/unittests/clangd/CodeCompletionStringsTests.cpp
new file mode 100644
index 00000000000..9f2ed804d77
--- /dev/null
+++ b/clang-tools-extra/unittests/clangd/CodeCompletionStringsTests.cpp
@@ -0,0 +1,142 @@
+//===-- CodeCompletionStringsTests.cpp --------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CodeCompletionStrings.h"
+#include "clang/Sema/CodeCompleteConsumer.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+namespace clang {
+namespace clangd {
+namespace {
+
+class CompletionStringTest : public ::testing::Test {
+public:
+  CompletionStringTest()
+      : Allocator(std::make_shared<clang::GlobalCodeCompletionAllocator>()),
+        CCTUInfo(Allocator), Builder(*Allocator, CCTUInfo) {}
+
+protected:
+  void labelAndInsertText(const CodeCompletionString &CCS,
+                          bool EnableSnippets = false) {
+    Label.clear();
+    InsertText.clear();
+    getLabelAndInsertText(CCS, &Label, &InsertText, EnableSnippets);
+  }
+
+  std::shared_ptr<clang::GlobalCodeCompletionAllocator> Allocator;
+  CodeCompletionTUInfo CCTUInfo;
+  CodeCompletionBuilder Builder;
+  std::string Label;
+  std::string InsertText;
+};
+
+TEST_F(CompletionStringTest, Detail) {
+  Builder.AddResultTypeChunk("result");
+  Builder.AddResultTypeChunk("redundant result no no");
+  EXPECT_EQ(getDetail(*Builder.TakeString()), "result");
+}
+
+TEST_F(CompletionStringTest, FilterText) {
+  Builder.AddTypedTextChunk("typed");
+  Builder.AddTypedTextChunk("redundant typed no no");
+  auto *S = Builder.TakeString();
+  EXPECT_EQ(getFilterText(*S), "typed");
+}
+
+TEST_F(CompletionStringTest, Documentation) {
+  Builder.addBriefComment("Is this brief?");
+  EXPECT_EQ(getDocumentation(*Builder.TakeString()), "Is this brief?");
+}
+
+TEST_F(CompletionStringTest, DocumentationWithAnnotation) {
+  Builder.addBriefComment("Is this brief?");
+  Builder.AddAnnotation("Ano");
+  EXPECT_EQ(getDocumentation(*Builder.TakeString()),
+            "Annotation: Ano\n\nIs this brief?");
+}
+
+TEST_F(CompletionStringTest, MultipleAnnotations) {
+  Builder.AddAnnotation("Ano1");
+  Builder.AddAnnotation("Ano2");
+  Builder.AddAnnotation("Ano3");
+
+  EXPECT_EQ(getDocumentation(*Builder.TakeString()),
+            "Annotations: Ano1 Ano2 Ano3\n");
+}
+
+TEST_F(CompletionStringTest, SimpleLabelAndInsert) {
+  Builder.AddTypedTextChunk("X");
+  Builder.AddResultTypeChunk("result no no");
+  labelAndInsertText(*Builder.TakeString());
+  EXPECT_EQ(Label, "X");
+  EXPECT_EQ(InsertText, "X");
+}
+
+TEST_F(CompletionStringTest, FunctionPlainText) {
+  Builder.AddResultTypeChunk("result no no");
+  Builder.AddTypedTextChunk("Foo");
+  Builder.AddChunk(CodeCompletionString::CK_LeftParen);
+  Builder.AddPlaceholderChunk("p1");
+  Builder.AddChunk(CodeCompletionString::CK_Comma);
+  Builder.AddPlaceholderChunk("p2");
+  Builder.AddChunk(CodeCompletionString::CK_RightParen);
+  Builder.AddChunk(CodeCompletionString::CK_HorizontalSpace);
+  Builder.AddInformativeChunk("const");
+
+  labelAndInsertText(*Builder.TakeString());
+  EXPECT_EQ(Label, "Foo(p1, p2) const");
+  EXPECT_EQ(InsertText, "Foo");
+}
+
+TEST_F(CompletionStringTest, FunctionSnippet) {
+  Builder.AddResultTypeChunk("result no no");
+  Builder.addBriefComment("Foo's comment");
+  Builder.AddTypedTextChunk("Foo");
+  Builder.AddChunk(CodeCompletionString::CK_LeftParen);
+  Builder.AddPlaceholderChunk("p1");
+  Builder.AddChunk(CodeCompletionString::CK_Comma);
+  Builder.AddPlaceholderChunk("p2");
+  Builder.AddChunk(CodeCompletionString::CK_RightParen);
+
+  auto *CCS = Builder.TakeString();
+  labelAndInsertText(*CCS);
+  EXPECT_EQ(Label, "Foo(p1, p2)");
+  EXPECT_EQ(InsertText, "Foo");
+
+  labelAndInsertText(*CCS, /*EnableSnippets=*/true);
+  EXPECT_EQ(Label, "Foo(p1, p2)");
+  EXPECT_EQ(InsertText, "Foo(${1:p1}, ${2:p2})");
+  EXPECT_EQ(getDocumentation(*CCS), "Foo's comment");
+  EXPECT_EQ(getFilterText(*CCS), "Foo");
+}
+
+TEST_F(CompletionStringTest, EscapeSnippet) {
+  Builder.AddTypedTextChunk("Foo");
+  Builder.AddChunk(CodeCompletionString::CK_LeftParen);
+  Builder.AddPlaceholderChunk("$p}1\\");
+  Builder.AddChunk(CodeCompletionString::CK_RightParen);
+
+  labelAndInsertText(*Builder.TakeString(), /*EnableSnippets=*/true);
+  EXPECT_EQ(Label, "Foo($p}1\\)");
+  EXPECT_EQ(InsertText, "Foo(${1:\\$p\\}1\\\\})");
+}
+
+TEST_F(CompletionStringTest, IgnoreInformativeQualifier) {
+  Builder.AddTypedTextChunk("X");
+  Builder.AddInformativeChunk("info ok");
+  Builder.AddInformativeChunk("info no no::");
+  labelAndInsertText(*Builder.TakeString());
+  EXPECT_EQ(Label, "Xinfo ok");
+  EXPECT_EQ(InsertText, "X");
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang