[lldb-vscode] support the completion request

Summary:
The DAP has a completion request that has been unimplemented. It allows showing autocompletion tokens inside the Debug Console.
I implemented it in a very simple fashion mimicking what the user would see when autocompleting an expression inside the CLI.
There are two cases: normal variables and commands. The latter occurs when a text is prepepended with ` in the Debug Console.
These two cases work well and have tests.

Reviewers: clayborg, aadsm

Subscribers: lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D69873

1 files changed, 16 insertions, 0 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/vscode.py b/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/vscode.py
index b4e21989463..1110ad36c0f 100644
--- a/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/vscode.py
+++ b/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/vscode.py
@@ -348,6 +348,10 @@ class DebugCommunication(object):
         print('invalid response')
         return None
 
+    def get_completions(self, text):
+        response = self.request_completions(text)
+        return response['body']['targets']
+
     def get_scope_variables(self, scope_name, frameIndex=0, threadId=None):
         stackFrame = self.get_stackFrame(frameIndex=frameIndex,
                                          threadId=threadId)
@@ -715,6 +719,18 @@ class DebugCommunication(object):
         }
         return self.send_recv(command_dict)
 
+    def request_completions(self, text):
+        args_dict = {
+            'text': text,
+            'column': len(text)
+        }
+        command_dict = {
+            'command': 'completions',
+            'type': 'request',
+            'arguments': args_dict
+        }
+        return self.send_recv(command_dict)
+
     def request_stackTrace(self, threadId=None, startFrame=None, levels=None,
                            dump=False):
         if threadId is None: