[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

1 files changed, 9 insertions, 0 deletions

diff --git a/lldb/source/Core/Debugger.cpp b/lldb/source/Core/Debugger.cpp
index 972d0bc0a6d..b29f3565e03 100644
--- a/lldb/source/Core/Debugger.cpp
+++ b/lldb/source/Core/Debugger.cpp
@@ -233,6 +233,8 @@ static PropertyDefinition g_properties[] = {
      nullptr,
      "The number of sources lines to display that come before the "
      "current source line when displaying a stopped context."},
+    {"highlight-source", OptionValue::eTypeBoolean, true, true, nullptr,
+     nullptr, "If true, LLDB will highlight the displayed source code."},
     {"stop-show-column", OptionValue::eTypeEnum, false,
      eStopShowColumnAnsiOrCaret, nullptr, s_stop_show_column_values,
      "If true, LLDB will use the column information from the debug info to "
@@ -296,6 +298,7 @@ enum {
   ePropertyStopDisassemblyDisplay,
   ePropertyStopLineCountAfter,
   ePropertyStopLineCountBefore,
+  ePropertyHighlightSource,
   ePropertyStopShowColumn,
   ePropertyStopShowColumnAnsiPrefix,
   ePropertyStopShowColumnAnsiSuffix,
@@ -470,6 +473,12 @@ bool Debugger::SetUseColor(bool b) {
   return ret;
 }
 
+bool Debugger::GetHighlightSource() const {
+  const uint32_t idx = ePropertyHighlightSource;
+  return m_collection_sp->GetPropertyAtIndexAsBoolean(
+      nullptr, idx, g_properties[idx].default_uint_value);
+}
+
 StopShowColumn Debugger::GetStopShowColumn() const {
   const uint32_t idx = ePropertyStopShowColumn;
   return (lldb::StopShowColumn)m_collection_sp->GetPropertyAtIndexAsEnumeration(