1 //===-- CommandAlias.cpp -----------------------------------------*- C++-*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 #include "lldb/Interpreter/CommandAlias.h"
11 #include "llvm/Support/ErrorHandling.h"
13 #include "lldb/Interpreter/CommandInterpreter.h"
14 #include "lldb/Interpreter/CommandObject.h"
15 #include "lldb/Interpreter/CommandReturnObject.h"
16 #include "lldb/Interpreter/Options.h"
17 #include "lldb/Utility/StreamString.h"
20 using namespace lldb_private;
22 static bool ProcessAliasOptionsArgs(lldb::CommandObjectSP &cmd_obj_sp,
23 llvm::StringRef options_args,
24 OptionArgVectorSP &option_arg_vector_sp) {
26 OptionArgVector *option_arg_vector = option_arg_vector_sp.get();
28 if (options_args.size() < 1)
31 Args args(options_args);
32 std::string options_string(options_args);
33 // TODO: Find a way to propagate errors in this CommandReturnObject up the
35 CommandReturnObject result;
36 // Check to see if the command being aliased can take any command options.
37 Options *options = cmd_obj_sp->GetOptions();
39 // See if any options were specified as part of the alias; if so, handle
40 // them appropriately.
41 ExecutionContext exe_ctx =
42 cmd_obj_sp->GetCommandInterpreter().GetExecutionContext();
43 options->NotifyOptionParsingStarting(&exe_ctx);
45 llvm::Expected<Args> args_or =
46 options->ParseAlias(args, option_arg_vector, options_string);
48 result.AppendError(toString(args_or.takeError()));
49 result.AppendError("Unable to create requested alias.\n");
50 result.SetStatus(eReturnStatusFailed);
53 args = std::move(*args_or);
54 options->VerifyPartialOptions(result);
55 if (!result.Succeeded() &&
56 result.GetStatus() != lldb::eReturnStatusStarted) {
57 result.AppendError("Unable to create requested alias.\n");
62 if (!options_string.empty()) {
63 if (cmd_obj_sp->WantsRawCommandString())
64 option_arg_vector->emplace_back("<argument>", -1, options_string);
66 for (auto &entry : args.entries()) {
67 if (!entry.ref.empty())
68 option_arg_vector->emplace_back("<argument>", -1, entry.ref);
76 CommandAlias::CommandAlias(CommandInterpreter &interpreter,
77 lldb::CommandObjectSP cmd_sp,
78 llvm::StringRef options_args, llvm::StringRef name,
79 llvm::StringRef help, llvm::StringRef syntax,
81 : CommandObject(interpreter, name, help, syntax, flags),
82 m_underlying_command_sp(), m_option_string(options_args),
83 m_option_args_sp(new OptionArgVector),
84 m_is_dashdash_alias(eLazyBoolCalculate), m_did_set_help(false),
85 m_did_set_help_long(false) {
86 if (ProcessAliasOptionsArgs(cmd_sp, options_args, m_option_args_sp)) {
87 m_underlying_command_sp = cmd_sp;
89 auto cmd_entry = m_underlying_command_sp->GetArgumentEntryAtIndex(i);
91 m_arguments.push_back(*cmd_entry);
95 StreamString translation_and_help;
96 GetAliasExpansion(sstr);
98 translation_and_help.Printf(
99 "(%s) %s", sstr.GetData(),
100 GetUnderlyingCommand()->GetHelp().str().c_str());
101 SetHelp(translation_and_help.GetString());
106 bool CommandAlias::WantsRawCommandString() {
108 return m_underlying_command_sp->WantsRawCommandString();
112 bool CommandAlias::WantsCompletion() {
114 return m_underlying_command_sp->WantsCompletion();
118 int CommandAlias::HandleCompletion(CompletionRequest &request) {
120 return m_underlying_command_sp->HandleCompletion(request);
124 int CommandAlias::HandleArgumentCompletion(
125 CompletionRequest &request, OptionElementVector &opt_element_vector) {
127 return m_underlying_command_sp->HandleArgumentCompletion(
128 request, opt_element_vector);
132 Options *CommandAlias::GetOptions() {
134 return m_underlying_command_sp->GetOptions();
138 bool CommandAlias::Execute(const char *args_string,
139 CommandReturnObject &result) {
140 llvm_unreachable("CommandAlias::Execute is not to be called");
143 void CommandAlias::GetAliasExpansion(StreamString &help_string) const {
144 llvm::StringRef command_name = m_underlying_command_sp->GetCommandName();
145 help_string.Printf("'%*s", (int)command_name.size(), command_name.data());
147 if (!m_option_args_sp) {
148 help_string.Printf("'");
152 OptionArgVector *options = m_option_args_sp.get();
156 for (const auto &opt_entry : *options) {
157 std::tie(opt, std::ignore, value) = opt_entry;
158 if (opt == "<argument>") {
159 help_string.Printf(" %s", value.c_str());
161 help_string.Printf(" %s", opt.c_str());
162 if ((value != "<no-argument>") && (value != "<need-argument")) {
163 help_string.Printf(" %s", value.c_str());
168 help_string.Printf("'");
171 bool CommandAlias::IsDashDashCommand() {
172 if (m_is_dashdash_alias != eLazyBoolCalculate)
173 return (m_is_dashdash_alias == eLazyBoolYes);
174 m_is_dashdash_alias = eLazyBoolNo;
181 for (const auto &opt_entry : *GetOptionArguments()) {
182 std::tie(opt, std::ignore, value) = opt_entry;
183 if (opt == "<argument>" && !value.empty() &&
184 llvm::StringRef(value).endswith("--")) {
185 m_is_dashdash_alias = eLazyBoolYes;
190 // if this is a nested alias, it may be adding arguments on top of an already
192 if ((m_is_dashdash_alias == eLazyBoolNo) && IsNestedAlias())
193 m_is_dashdash_alias =
194 (GetUnderlyingCommand()->IsDashDashCommand() ? eLazyBoolYes
196 return (m_is_dashdash_alias == eLazyBoolYes);
199 bool CommandAlias::IsNestedAlias() {
200 if (GetUnderlyingCommand())
201 return GetUnderlyingCommand()->IsAlias();
205 std::pair<lldb::CommandObjectSP, OptionArgVectorSP> CommandAlias::Desugar() {
206 auto underlying = GetUnderlyingCommand();
208 return {nullptr, nullptr};
210 if (underlying->IsAlias()) {
211 auto desugared = ((CommandAlias *)underlying.get())->Desugar();
212 auto options = GetOptionArguments();
213 options->insert(options->begin(), desugared.second->begin(),
214 desugared.second->end());
215 return {desugared.first, options};
218 return {underlying, GetOptionArguments()};
221 // allow CommandAlias objects to provide their own help, but fallback to the
222 // info for the underlying command if no customization has been provided
223 void CommandAlias::SetHelp(llvm::StringRef str) {
224 this->CommandObject::SetHelp(str);
225 m_did_set_help = true;
228 void CommandAlias::SetHelpLong(llvm::StringRef str) {
229 this->CommandObject::SetHelpLong(str);
230 m_did_set_help_long = true;
233 llvm::StringRef CommandAlias::GetHelp() {
234 if (!m_cmd_help_short.empty() || m_did_set_help)
235 return m_cmd_help_short;
237 return m_underlying_command_sp->GetHelp();
238 return llvm::StringRef();
241 llvm::StringRef CommandAlias::GetHelpLong() {
242 if (!m_cmd_help_long.empty() || m_did_set_help_long)
243 return m_cmd_help_long;
245 return m_underlying_command_sp->GetHelpLong();
246 return llvm::StringRef();