[LLDB] Added syntax highlighting support

Summary:
This patch adds syntax highlighting support to LLDB. When enabled (and lldb is allowed
to use colors), printed source code is annotated with the ANSI color escape sequences.

So far we have only one highlighter which is based on Clang and is responsible for all
languages that are supported by Clang. It essentially just runs the raw lexer over the input
and then surrounds the specific tokens with the configured escape sequences.

Reviewers: zturner, davide

Reviewed By: davide

Subscribers: labath, teemperor, llvm-commits, mgorny, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D49334

llvm-svn: 338662

3 files changed, 22 insertions, 0 deletions

diff --git a/lldb/source/Plugins/Language/CPlusPlus/CMakeLists.txt b/lldb/source/Plugins/Language/CPlusPlus/CMakeLists.txt
index 180440a244a..e7faee84988 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/CMakeLists.txt
+++ b/lldb/source/Plugins/Language/CPlusPlus/CMakeLists.txt
@@ -24,6 +24,8 @@ add_lldb_library(lldbPluginCPlusPlusLanguage PLUGIN
     lldbSymbol
     lldbTarget
     lldbUtility
+    lldbPluginClangCommon
+
   LINK_COMPONENTS
     Support
 )
diff --git a/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp b/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp
index 2c63e6467d4..9df8853f455 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp
@@ -1002,3 +1002,16 @@ CPlusPlusLanguage::GetHardcodedSynthetics() {
 
   return g_formatters;
 }
+
+bool CPlusPlusLanguage::IsSourceFile(llvm::StringRef file_path) const {
+  const auto suffixes = {".cpp", ".cxx", ".c++", ".cc",  ".c",
+                         ".h",   ".hh",  ".hpp", ".hxx", ".h++"};
+  for (auto suffix : suffixes) {
+    if (file_path.endswith_lower(suffix))
+      return true;
+  }
+
+  // Check if we're in a STL path (where the files usually have no extension
+  // that we could check for.
+  return file_path.contains("/usr/include/c++/");
+}
diff --git a/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h b/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h
index 7380ef32130..505ebb2fa9e 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h
+++ b/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h
@@ -19,6 +19,7 @@
 #include "llvm/ADT/StringRef.h"
 
 // Project includes
+#include "Plugins/Language/ClangCommon/ClangHighlighter.h"
 #include "lldb/Target/Language.h"
 #include "lldb/Utility/ConstString.h"
 #include "lldb/lldb-private.h"
@@ -26,6 +27,8 @@
 namespace lldb_private {
 
 class CPlusPlusLanguage : public Language {
+  ClangHighlighter m_highlighter;
+
 public:
   class MethodName {
   public:
@@ -90,6 +93,10 @@ public:
   HardcodedFormatters::HardcodedSyntheticFinder
   GetHardcodedSynthetics() override;
 
+  bool IsSourceFile(llvm::StringRef file_path) const override;
+
+  const Highlighter *GetHighlighter() const override { return &m_highlighter; }
+
   //------------------------------------------------------------------
   // Static Functions
   //------------------------------------------------------------------