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292 lines
11 KiB
C++
292 lines
11 KiB
C++
// This file's contents is largely lifted from boost::program_options with only minor modification.
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// Its original preamble (without updated dates) from those source files is below:
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// Copyright Vladimir Prus 2002-2004.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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#include "configfileparser.hpp"
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#include <boost/program_options/detail/config_file.hpp>
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#include <boost/program_options/detail/convert.hpp>
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namespace Files
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{
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namespace
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{
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/** Standalone parser for config files in ini-line format.
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The parser is a model of single-pass lvalue iterator, and
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default constructor creates past-the-end-iterator. The typical usage is:
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config_file_iterator i(is, ... set of options ...), e;
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for(; i !=e; ++i) {
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*i;
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}
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Syntax conventions:
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- config file can not contain positional options
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- '#' is comment character: it is ignored together with
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the rest of the line.
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- variable assignments are in the form
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name '=' value.
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spaces around '=' are trimmed.
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- Section names are given in brackets.
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The actual option name is constructed by combining current section
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name and specified option name, with dot between. If section_name
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already contains dot at the end, new dot is not inserted. For example:
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@verbatim
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[gui.accessibility]
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visual_bell=yes
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@endverbatim
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will result in option "gui.accessibility.visual_bell" with value
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"yes" been returned.
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TODO: maybe, we should just accept a pointer to options_description
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class.
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*/
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class common_config_file_iterator : public boost::eof_iterator<common_config_file_iterator, bpo::option>
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{
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public:
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common_config_file_iterator() { found_eof(); }
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common_config_file_iterator(const std::set<std::string>& allowed_options, bool allow_unregistered = false);
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virtual ~common_config_file_iterator() {}
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public: // Method required by eof_iterator
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void get();
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#if BOOST_WORKAROUND(_MSC_VER, <= 1900)
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void decrement() {}
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void advance(difference_type) {}
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#endif
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protected: // Stubs for derived classes
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// Obtains next line from the config file
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// Note: really, this design is a bit ugly
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// The most clean thing would be to pass 'line_iterator' to
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// constructor of this class, but to avoid templating this class
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// we'd need polymorphic iterator, which does not exist yet.
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virtual bool getline(std::string&)
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{
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return false;
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}
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protected:
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/** Adds another allowed option. If the 'name' ends with
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'*', then all options with the same prefix are
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allowed. For example, if 'name' is 'foo*', then 'foo1' and
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'foo_bar' are allowed. */
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void add_option(const char* name);
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// Returns true if 's' is a registered option name.
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bool allowed_option(const std::string& s) const;
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// That's probably too much data for iterator, since
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// it will be copied, but let's not bother for now.
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std::set<std::string> allowed_options;
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// Invariant: no element is prefix of other element.
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std::set<std::string> allowed_prefixes;
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std::string m_prefix;
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bool m_allow_unregistered = false;
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};
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common_config_file_iterator::common_config_file_iterator(
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const std::set<std::string>& allowed_options, bool allow_unregistered)
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: allowed_options(allowed_options)
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, m_allow_unregistered(allow_unregistered)
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{
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for (std::set<std::string>::const_iterator i = allowed_options.begin(); i != allowed_options.end(); ++i)
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{
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add_option(i->c_str());
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}
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}
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void common_config_file_iterator::add_option(const char* name)
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{
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std::string s(name);
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assert(!s.empty());
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if (*s.rbegin() == '*')
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{
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s.resize(s.size() - 1);
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bool bad_prefixes(false);
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// If 's' is a prefix of one of allowed suffix, then
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// lower_bound will return that element.
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// If some element is prefix of 's', then lower_bound will
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// return the next element.
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std::set<std::string>::iterator i = allowed_prefixes.lower_bound(s);
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if (i != allowed_prefixes.end())
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{
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if (i->find(s) == 0)
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bad_prefixes = true;
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}
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if (i != allowed_prefixes.begin())
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{
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--i;
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if (s.find(*i) == 0)
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bad_prefixes = true;
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}
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if (bad_prefixes)
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boost::throw_exception(
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bpo::error("options '" + std::string(name) + "' and '" + *i
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+ "*' will both match the same "
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"arguments from the configuration file"));
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allowed_prefixes.insert(s);
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}
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}
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std::string trim_ws(const std::string& s)
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{
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std::string::size_type n, n2;
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n = s.find_first_not_of(" \t\r\n");
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if (n == std::string::npos)
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return std::string();
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else
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{
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n2 = s.find_last_not_of(" \t\r\n");
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return s.substr(n, n2 - n + 1);
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}
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}
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void common_config_file_iterator::get()
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{
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std::string s;
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std::string::size_type n;
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bool found = false;
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while (this->getline(s))
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{
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// strip '#' comments and whitespace
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if (s.find('#') == s.find_first_not_of(" \t\r\n"))
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continue;
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s = trim_ws(s);
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if (!s.empty())
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{
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// Handle section name
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if (*s.begin() == '[' && *s.rbegin() == ']')
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{
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m_prefix = s.substr(1, s.size() - 2);
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if (*m_prefix.rbegin() != '.')
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m_prefix += '.';
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}
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else if ((n = s.find('=')) != std::string::npos)
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{
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std::string name = m_prefix + trim_ws(s.substr(0, n));
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std::string value = trim_ws(s.substr(n + 1));
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bool registered = allowed_option(name);
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if (!registered && !m_allow_unregistered)
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boost::throw_exception(bpo::unknown_option(name));
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found = true;
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this->value().string_key = name;
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this->value().value.clear();
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this->value().value.push_back(value);
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this->value().unregistered = !registered;
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this->value().original_tokens.clear();
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this->value().original_tokens.push_back(name);
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this->value().original_tokens.push_back(value);
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break;
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}
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else
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{
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boost::throw_exception(
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bpo::invalid_config_file_syntax(s, bpo::invalid_syntax::unrecognized_line));
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}
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}
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}
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if (!found)
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found_eof();
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}
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bool common_config_file_iterator::allowed_option(const std::string& s) const
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{
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std::set<std::string>::const_iterator i = allowed_options.find(s);
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if (i != allowed_options.end())
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return true;
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// If s is "pa" where "p" is allowed prefix then
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// lower_bound should find the element after "p".
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// This depends on 'allowed_prefixes' invariant.
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i = allowed_prefixes.lower_bound(s);
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if (i != allowed_prefixes.begin() && s.find(*--i) == 0)
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return true;
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return false;
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}
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template <class charT>
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class basic_config_file_iterator : public Files::common_config_file_iterator
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{
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public:
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basic_config_file_iterator() { found_eof(); }
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/** Creates a config file parser for the specified stream.
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*/
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basic_config_file_iterator(std::basic_istream<charT>& is, const std::set<std::string>& allowed_options,
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bool allow_unregistered = false);
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private: // base overrides
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bool getline(std::string&);
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private: // internal data
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std::shared_ptr<std::basic_istream<charT>> is;
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};
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template <class charT>
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basic_config_file_iterator<charT>::basic_config_file_iterator(
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std::basic_istream<charT>& is, const std::set<std::string>& allowed_options, bool allow_unregistered)
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: common_config_file_iterator(allowed_options, allow_unregistered)
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{
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this->is.reset(&is, bpo::detail::null_deleter());
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get();
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}
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template <class charT>
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bool basic_config_file_iterator<charT>::getline(std::string& s)
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{
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std::basic_string<charT> in;
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if (std::getline(*is, in))
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{
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s = bpo::to_internal(in);
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return true;
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}
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else
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{
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return false;
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}
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}
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}
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template <class charT>
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bpo::basic_parsed_options<charT> parse_config_file(
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std::basic_istream<charT>& is, const bpo::options_description& desc, bool allow_unregistered)
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{
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std::set<std::string> allowed_options;
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const std::vector<boost::shared_ptr<bpo::option_description>>& options = desc.options();
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for (unsigned i = 0; i < options.size(); ++i)
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{
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const bpo::option_description& d = *options[i];
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if (d.long_name().empty())
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boost::throw_exception(
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bpo::error("abbreviated option names are not permitted in options configuration files"));
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allowed_options.insert(d.long_name());
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}
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// Parser return char strings
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bpo::parsed_options result(&desc);
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copy(basic_config_file_iterator<charT>(is, allowed_options, allow_unregistered),
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basic_config_file_iterator<charT>(), back_inserter(result.options));
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// Convert char strings into desired type.
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return bpo::basic_parsed_options<charT>(result);
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}
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template bpo::basic_parsed_options<char> parse_config_file(
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std::basic_istream<char>& is, const bpo::options_description& desc, bool allow_unregistered);
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}
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