C++ path::is_absolute方法代码示例

/// Parses a user-provided test filter.
///
/// \param str The user-provided string representing a filter for tests.  Must
///     be of the form <test_program%gt;[:<test_case%gt;].
///
/// \return The parsed filter.
///
/// \throw std::runtime_error If the provided filter is invalid.
engine::test_filter
engine::test_filter::parse(const std::string& str)
{
    if (str.empty())
        throw std::runtime_error("Test filter cannot be empty");

    const std::string::size_type pos = str.find(':');
    if (pos == 0)
        throw std::runtime_error(F("Program name component in '%s' is empty")
                                 % str);
    if (pos == str.length() - 1)
        throw std::runtime_error(F("Test case component in '%s' is empty")
                                 % str);

    try {
        const fs::path test_program_(str.substr(0, pos));
        if (test_program_.is_absolute())
            throw std::runtime_error(F("Program name '%s' must be relative "
                                       "to the test suite, not absolute") %
                                       test_program_.str());
        if (pos == std::string::npos) {
            LD(F("Parsed user filter '%s': test program '%s', no test case") %
               str % test_program_.str());
            return test_filter(test_program_, "");
        } else {
            const std::string test_case_(str.substr(pos + 1));
            LD(F("Parsed user filter '%s': test program '%s', test case '%s'") %
               str % test_program_.str() % test_case_);
            return test_filter(test_program_, test_case_);
        }
    } catch (const fs::error& e) {
        throw std::runtime_error(F("Invalid path in filter '%s': %s") % str %
                                 e.what());
    }
}

/// Concatenates this path with another path.
///
/// \param rest The path to concatenate to this one.  Cannot be absolute.
///
/// \return A new path containing the concatenation of this path and the other
///     path.
///
/// \throw utils::fs::join_error If the join operation is invalid because the
///     two paths are incompatible.
fs::path
fs::path::operator/(const fs::path& rest) const
{
    if (rest.is_absolute())
        throw fs::join_error(_repr, rest._repr,
                             "Cannot concatenate a path to an absolute path");
    return fs::path(_repr + '/' + rest._repr);
}

 /// Constructor.
 ///
 /// \param interface_name_ Name of the test program interface.
 /// \param binary_ The name of the test program binary relative to root_.
 /// \param root_ The root of the test suite containing the test program.
 /// \param test_suite_name_ The name of the test suite this program
 ///     belongs to.
 /// \param md_ Metadata of the test program.
 impl(const std::string& interface_name_, const fs::path& binary_,
      const fs::path& root_, const std::string& test_suite_name_,
      const metadata& md_) :
     interface_name(interface_name_),
     binary(binary_),
     root(root_),
     test_suite_name(test_suite_name_),
     md(md_)
 {
     PRE_MSG(!binary.is_absolute(),
             F("The program '%s' must be relative to the root of the test "
               "suite '%s'") % binary % root);
 }

/// Returns the test suite name for the current directory.
///
/// \return The identifier of the current test suite.
std::string
layout::test_suite_for_path(const fs::path& path)
{
    std::string test_suite;
    if (path.is_absolute())
        test_suite = path.str();
    else
        test_suite = path.to_absolute().str();
    PRE(!test_suite.empty() && test_suite[0] == '/');

    std::replace(test_suite.begin(), test_suite.end(), '/', '_');
    test_suite.erase(0, 1);

    return test_suite;
}

/// Locates a file in the PATH.
///
/// \param name The file to locate.
///
/// \return The path to the located file or none if it was not found.  The
/// returned path is always absolute.
optional< fs::path >
fs::find_in_path(const char* name)
{
    const optional< std::string > current_path = utils::getenv("PATH");
    if (!current_path || current_path.get().empty())
        return none;

    std::istringstream path_input(current_path.get() + ":");
    std::string path_component;
    while (std::getline(path_input, path_component, ':').good()) {
        const fs::path candidate = path_component.empty() ?
                                   fs::path(name) : (fs::path(path_component) / name);
        if (exists(candidate)) {
            if (candidate.is_absolute())
                return utils::make_optional(candidate);
            else
                return utils::make_optional(candidate.to_absolute());
        }
    }
    return none;
}

    /// Constructor.
    ///
    /// \param interface_name_ Name of the test program interface.
    /// \param binary_ The name of the test program binary relative to root_.
    /// \param root_ The root of the test suite containing the test program.
    /// \param test_suite_name_ The name of the test suite this program
    ///     belongs to.
    /// \param md_ Metadata of the test program.
    /// \param test_cases_ The collection of test cases in the test program.
    impl(const std::string& interface_name_, const fs::path& binary_,
         const fs::path& root_, const std::string& test_suite_name_,
         const model::metadata& md_, const model::test_cases_map& test_cases_) :
        interface_name(interface_name_),
        binary(binary_),
        root(root_),
        test_suite_name(test_suite_name_),
        md(md_),
        test_cases(test_cases_)
    {
        PRE_MSG(!binary.is_absolute(),
                F("The program '%s' must be relative to the root of the test "
                  "suite '%s'") % binary % root);

        for (model::test_cases_map::const_iterator iter = test_cases.begin();
             iter != test_cases.end(); ++iter) {
            PRE_MSG((*iter).first == (*iter).second.name(),
                    F("The test case '%s' has been registered with the "
                      "non-matching name '%s'") %
                    (*iter).first % (*iter).second.name());
        }
    }

/// Gets the absolute path to the test program.
///
/// \return The absolute path to the test program binary.
const fs::path
model::test_program::absolute_path(void) const
{
    const fs::path full_path = _pimpl->root / _pimpl->binary;
    return full_path.is_absolute() ? full_path : full_path.to_absolute();
}