[lldb-dap] Make connection URLs match lldb (llvm#144770)

Use the same scheme as ConnectionFileDescriptor::Connect and use
"listen" and "accept". Addresses feedback from a Pavel in a different PR
[1].

[1] llvm#143628 (comment)

(cherry picked from commit 4f991cc)

Author: JDevlieghere

lldb/include/lldb/Host/Socket.h

@@ -73,6 +73,11 @@ class Socket : public IOObject {
     ProtocolUnixAbstract
   };
 
+  enum SocketMode {
+    ModeAccept,
+    ModeConnect,
+  };
+
   struct HostAndPort {
     std::string hostname;
     uint16_t port;
@@ -82,6 +87,10 @@ class Socket : public IOObject {
     }
   };
 
+  using ProtocolModePair = std::pair<SocketProtocol, SocketMode>;
+  static std::optional<ProtocolModePair>
+  GetProtocolAndMode(llvm::StringRef scheme);
+
   static const NativeSocket kInvalidSocketValue;
 
   ~Socket() override;

lldb/source/Host/common/Socket.cpp

@@ -295,7 +295,8 @@ Socket::UdpConnect(llvm::StringRef host_and_port,
   return UDPSocket::Connect(host_and_port, child_processes_inherit);
 }
 
-llvm::Expected<Socket::HostAndPort> Socket::DecodeHostAndPort(llvm::StringRef host_and_port) {
+llvm::Expected<Socket::HostAndPort>
+Socket::DecodeHostAndPort(llvm::StringRef host_and_port) {
   static llvm::Regex g_regex("([^:]+|\\[[0-9a-fA-F:]+.*\\]):([0-9]+)");
   HostAndPort ret;
   llvm::SmallVector<llvm::StringRef, 3> matches;
@@ -371,8 +372,8 @@ Status Socket::Write(const void *buf, size_t &num_bytes) {
               ", src = %p, src_len = %" PRIu64 ", flags = 0) => %" PRIi64
               " (error = %s)",
               static_cast<void *>(this), static_cast<uint64_t>(m_socket), buf,
-              static_cast<uint64_t>(src_len),
-              static_cast<int64_t>(bytes_sent), error.AsCString());
+              static_cast<uint64_t>(src_len), static_cast<int64_t>(bytes_sent),
+              error.AsCString());
   }
 
   return error;
@@ -497,3 +498,28 @@ llvm::raw_ostream &lldb_private::operator<<(llvm::raw_ostream &OS,
                                             const Socket::HostAndPort &HP) {
   return OS << '[' << HP.hostname << ']' << ':' << HP.port;
 }
+
+std::optional<Socket::ProtocolModePair>
+Socket::GetProtocolAndMode(llvm::StringRef scheme) {
+  // Keep in sync with ConnectionFileDescriptor::Connect.
+  return llvm::StringSwitch<std::optional<ProtocolModePair>>(scheme)
+      .Case("listen", ProtocolModePair{SocketProtocol::ProtocolTcp,
+                                       SocketMode::ModeAccept})
+      .Cases("accept", "unix-accept",
+             ProtocolModePair{SocketProtocol::ProtocolUnixDomain,
+                              SocketMode::ModeAccept})
+      .Case("unix-abstract-accept",
+            ProtocolModePair{SocketProtocol::ProtocolUnixAbstract,
+                             SocketMode::ModeAccept})
+      .Cases("connect", "tcp-connect",
+             ProtocolModePair{SocketProtocol::ProtocolTcp,
+                              SocketMode::ModeConnect})
+      .Case("udp", ProtocolModePair{SocketProtocol::ProtocolTcp,
+                                    SocketMode::ModeConnect})
+      .Case("unix-connect", ProtocolModePair{SocketProtocol::ProtocolUnixDomain,
+                                             SocketMode::ModeConnect})
+      .Case("unix-abstract-connect",
+            ProtocolModePair{SocketProtocol::ProtocolUnixAbstract,
+                             SocketMode::ModeConnect})
+      .Default(std::nullopt);
+}