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/*
* SPDX-FileCopyrightText: Copyright (c) 1993-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "getOptions.h"
#include "logger.h"
#include <algorithm>
#include <cassert>
#include <cctype>
#include <cstring>
#include <set>
namespace nvinfer1::utility
{
namespace
{
using namespace std::string_view_literals;
using sample::gLogWarning;
//! Matching for TRTOptions is defined as follows:
//!
//! If A and B both have longName set, A matches B if and only if A.longName ==
//! B.longName and (A.shortName == B.shortName if both have short name set).
//!
//! If A only has shortName set and B only has longName set, then A does not
//! match B. It is assumed that when 2 TRTOptions are compared, one of them is
//! the definition of a TRTOption in the input to getOptions. As such, if the
//! definition only has shortName set, it will never be equal to a TRTOption
//! that does not have shortName set (and same for longName).
//!
//! If A and B both have shortName set but B does not have longName set, A
//! matches B if and only if A.shortName == B.shortName.
//!
//! If A has neither long or short name set, A matches B if and only if B has
//! neither long or short name set.
[[nodiscard]] bool matches(TRTOption const& a, TRTOption const& b)
{
if (!a.longName.empty() && !b.longName.empty())
{
if (a.shortName != '\0' && b.shortName != '\0')
{
return (a.longName == b.longName) && (a.shortName == b.shortName);
}
return a.longName == b.longName;
}
// If only one of them is not set, this will return false anyway.
return a.shortName == b.shortName;
}
//! getTRTOptionIndex returns the index of a TRTOption in a vector of
//! TRTOptions, -1 if not found.
[[nodiscard]] int32_t getTRTOptionIndex(std::vector<TRTOption> const& options, TRTOption const& opt)
{
auto it = std::find_if(
options.begin(), options.end(), [&opt](TRTOption const& option) { return matches(opt, option); });
return it != options.end() ? static_cast<int32_t>(std::distance(options.begin(), it)) : -1;
}
//! validateTRTOption will return a string containing an error message if options
//! contain non-numeric characters, or if there are duplicate option names found.
//! Otherwise, returns the empty string.
[[nodiscard]] std::string validateTRTOption(
std::set<char> const& seenShortNames, std::set<std::string> const& seenLongNames, TRTOption const& opt)
{
if (opt.shortName != '\0')
{
if (!std::isalnum(opt.shortName))
{
return "Short name '" + std::to_string(opt.shortName) + "' is non-alphanumeric";
}
if (seenShortNames.count(opt.shortName) != 0)
{
return "Short name '" + std::to_string(opt.shortName) + "' is a duplicate";
}
}
if (!opt.longName.empty())
{
for (char const& c : opt.longName)
{
if (!std::isalnum(c) && c != '-' && c != '_')
{
return "Long name '" + opt.longName + "' contains characters that are not '-', '_', or alphanumeric";
}
}
if (seenLongNames.count(opt.longName) != 0)
{
return "Long name '" + opt.longName + "' is a duplicate";
}
}
return "";
}
//! validateTRTOptions will return a string containing an error message if any
//! options contain non-numeric characters, or if there are duplicate option
//! names found. Otherwise, returns the empty string.
[[nodiscard]] std::string validateTRTOptions(std::vector<TRTOption> const& options)
{
std::set<char> seenShortNames;
std::set<std::string> seenLongNames;
for (size_t i = 0; i < options.size(); ++i)
{
std::string const errMsg = validateTRTOption(seenShortNames, seenLongNames, options[i]);
if (!errMsg.empty())
{
return "Error '" + errMsg + "' at TRTOption " + std::to_string(i);
}
seenShortNames.insert(options[i].shortName);
seenLongNames.insert(options[i].longName);
}
return "";
}
//! Structure to hold a parsed option and its inline value (if any)
struct ParsedOption
{
TRTOption opt;
std::string inlineValue;
};
//! Parse an option string (starting with '-' or '--') into a TRTOption and optional inline value.
//! \param[in] argStr The option string to parse.
//! \param[out] result The parsed option and inline value.
//! \return error message if parsing fails, empty string otherwise.
[[nodiscard]] std::string parseOptionString(std::string_view const argStr, ParsedOption& result)
{
// C++23: Return a `std::expected<ParsedOption, std::string>` instead.
if (argStr.size() < 2)
{
return "Option string is too short";
}
if (argStr[1] != '-')
{
// Short option: must only have 1 char after the hyphen
if (argStr.size() > 2)
{
return "Short arg contains more than 1 character";
}
result = ParsedOption{TRTOption{argStr[1]}};
return {};
}
else
{
// Long option: extract name and check for --foo=bar syntax
auto longName = argStr.substr(2);
size_t const eqIndex = longName.find('=');
auto inlineValue = eqIndex != std::string_view::npos ? longName.substr(eqIndex + 1) : ""sv;
// Note: If `eqIndex == std::string_view::npos`, then `longName.substr(0, eqIndex)` is the entire string_view.
result = ParsedOption{TRTOption{{}, std::string{longName.substr(0, eqIndex)}}, std::string{inlineValue}};
return {};
}
}
//! Handle an option that requires a value. Returns error message if value cannot be obtained.
//! Updates currentArgIdx if a value is consumed from the next argument.
[[nodiscard]] std::string handleRequiredValue(TRTParsedArgs& parsedArgs, int32_t idx, std::string inlineValue,
std::string_view const argStr, int32_t& currentArgIdx, int32_t argc, char const* const* argv)
{
// If we have an inline value (from --foo=bar), use it
if (!inlineValue.empty())
{
parsedArgs.values[idx].addOccurrence(std::move(inlineValue));
return {};
}
// Otherwise, consume the next argument as the value
if (currentArgIdx + 1 >= argc)
{
return "Last argument requires value, but none given";
}
std::string_view const nextArg(argv[currentArgIdx + 1]);
if (!nextArg.empty() && nextArg[0] == '-')
{
gLogWarning << "Warning: Using '" << nextArg << "' as a value for '" << argStr
<< "', Should this be its own flag?" << std::endl;
}
parsedArgs.values[idx].addOccurrence(std::string{nextArg});
++currentArgIdx; // Next argument consumed
return {};
}
//! parseArgs parses an argument list and returns a TRTParsedArgs with the
//! fields set accordingly. Assumes that options is validated.
//! ErrMsg will be set if:
//! - an argument is null
//! - an argument is empty
//! - an argument does not have option (i.e. "-" and "--")
//! - a short argument has more than 1 character
//! - the last argument in the list requires a value
[[nodiscard]] TRTParsedArgs parseArgs(
int32_t const argc, char const* const* const argv, std::vector<TRTOption> const& options)
{
TRTParsedArgs parsedArgs;
parsedArgs.values.resize(options.size());
for (int32_t i = 1; i < argc; ++i) // index of current command-line argument
{
if (argv[i] == nullptr)
{
return TRTParsedArgs{"Null argument at index " + std::to_string(i)};
}
std::string_view const argStr(argv[i]);
if (argStr.empty())
{
return TRTParsedArgs{"Empty argument at index " + std::to_string(i)};
}
// No starting hyphen means it is a positional argument
if (argStr[0] != '-')
{
parsedArgs.positionalArgs.push_back(std::string{argStr});
continue;
}
if (argStr == "-"sv || argStr == "--"sv)
{
return TRTParsedArgs{"Argument does not specify an option at index " + std::to_string(i)};
}
// Parse the option string
ParsedOption parsed;
if (std::string const parseErr = parseOptionString(argStr, parsed); !parseErr.empty())
{
return TRTParsedArgs{parseErr + " at index " + std::to_string(i)};
}
// Find the option in the registered options list
int32_t const idx = getTRTOptionIndex(options, parsed.opt);
if (idx < 0)
{
continue;
}
// Handle value-required options vs. flag options
if (options[idx].valueRequired)
{
if (std::string valueErr = handleRequiredValue(parsedArgs, idx, parsed.inlineValue, argStr, i, argc, argv);
!valueErr.empty())
{
return TRTParsedArgs{std::move(valueErr)};
}
}
else
{
parsedArgs.values[idx].addOccurrence();
}
}
return parsedArgs;
}
} // namespace
TRTParsedArgs getOptions(int32_t argc, char const* const* argv, std::vector<TRTOption> const& options)
{
if (std::string errMsg = validateTRTOptions(options); !errMsg.empty())
{
return TRTParsedArgs{std::move(errMsg)};
}
return parseArgs(argc, argv, options);
}
} // namespace nvinfer1::utility