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 void CommandAlias::HandleCompletion(CompletionRequest &request) {
120 m_underlying_command_sp->HandleCompletion(request);
123 void CommandAlias::HandleArgumentCompletion(
124 CompletionRequest &request, OptionElementVector &opt_element_vector) {
126 m_underlying_command_sp->HandleArgumentCompletion(request,
130 Options *CommandAlias::GetOptions() {
132 return m_underlying_command_sp->GetOptions();
136 bool CommandAlias::Execute(const char *args_string,
137 CommandReturnObject &result) {
138 llvm_unreachable("CommandAlias::Execute is not to be called");
141 void CommandAlias::GetAliasExpansion(StreamString &help_string) const {
142 llvm::StringRef command_name = m_underlying_command_sp->GetCommandName();
143 help_string.Printf("'%*s", (int)command_name.size(), command_name.data());
145 if (!m_option_args_sp) {
146 help_string.Printf("'");
150 OptionArgVector *options = m_option_args_sp.get();
154 for (const auto &opt_entry : *options) {
155 std::tie(opt, std::ignore, value) = opt_entry;
156 if (opt == "<argument>") {
157 help_string.Printf(" %s", value.c_str());
159 help_string.Printf(" %s", opt.c_str());
160 if ((value != "<no-argument>") && (value != "<need-argument")) {
161 help_string.Printf(" %s", value.c_str());
166 help_string.Printf("'");
169 bool CommandAlias::IsDashDashCommand() {
170 if (m_is_dashdash_alias != eLazyBoolCalculate)
171 return (m_is_dashdash_alias == eLazyBoolYes);
172 m_is_dashdash_alias = eLazyBoolNo;
179 for (const auto &opt_entry : *GetOptionArguments()) {
180 std::tie(opt, std::ignore, value) = opt_entry;
181 if (opt == "<argument>" && !value.empty() &&
182 llvm::StringRef(value).endswith("--")) {
183 m_is_dashdash_alias = eLazyBoolYes;
188 // if this is a nested alias, it may be adding arguments on top of an already
190 if ((m_is_dashdash_alias == eLazyBoolNo) && IsNestedAlias())
191 m_is_dashdash_alias =
192 (GetUnderlyingCommand()->IsDashDashCommand() ? eLazyBoolYes
194 return (m_is_dashdash_alias == eLazyBoolYes);
197 bool CommandAlias::IsNestedAlias() {
198 if (GetUnderlyingCommand())
199 return GetUnderlyingCommand()->IsAlias();
203 std::pair<lldb::CommandObjectSP, OptionArgVectorSP> CommandAlias::Desugar() {
204 auto underlying = GetUnderlyingCommand();
206 return {nullptr, nullptr};
208 if (underlying->IsAlias()) {
209 auto desugared = ((CommandAlias *)underlying.get())->Desugar();
210 auto options = GetOptionArguments();
211 options->insert(options->begin(), desugared.second->begin(),
212 desugared.second->end());
213 return {desugared.first, options};
216 return {underlying, GetOptionArguments()};
219 // allow CommandAlias objects to provide their own help, but fallback to the
220 // info for the underlying command if no customization has been provided
221 void CommandAlias::SetHelp(llvm::StringRef str) {
222 this->CommandObject::SetHelp(str);
223 m_did_set_help = true;
226 void CommandAlias::SetHelpLong(llvm::StringRef str) {
227 this->CommandObject::SetHelpLong(str);
228 m_did_set_help_long = true;
231 llvm::StringRef CommandAlias::GetHelp() {
232 if (!m_cmd_help_short.empty() || m_did_set_help)
233 return m_cmd_help_short;
235 return m_underlying_command_sp->GetHelp();
236 return llvm::StringRef();
239 llvm::StringRef CommandAlias::GetHelpLong() {
240 if (!m_cmd_help_long.empty() || m_did_set_help_long)
241 return m_cmd_help_long;
243 return m_underlying_command_sp->GetHelpLong();
244 return llvm::StringRef();