1 // ----------------------------------------------------------------------------
2 // Copyright (C) 2002-2006 Marcin Kalicinski
4 // Distributed under the Boost Software License, Version 1.0.
5 // (See accompanying file LICENSE_1_0.txt or copy at
6 // http://www.boost.org/LICENSE_1_0.txt)
8 // For more information, see www.boost.org
9 // ----------------------------------------------------------------------------
10 #ifndef BOOST_PROPERTY_TREE_DETAIL_INFO_PARSER_WRITE_HPP_INCLUDED
11 #define BOOST_PROPERTY_TREE_DETAIL_INFO_PARSER_WRITE_HPP_INCLUDED
13 #include "boost/property_tree/ptree.hpp"
14 #include "boost/property_tree/detail/info_parser_utils.hpp"
17 namespace boost { namespace property_tree { namespace info_parser
20 void write_info_indent(std::basic_ostream<Ch> &stream,
22 const info_writer_settings<Ch> &settings
25 stream << std::basic_string<Ch>(indent * settings.indent_count, settings.indent_char);
28 // Create necessary escape sequences from illegal characters
30 std::basic_string<Ch> create_escapes(const std::basic_string<Ch> &s)
32 std::basic_string<Ch> result;
33 typename std::basic_string<Ch>::const_iterator b = s.begin();
34 typename std::basic_string<Ch>::const_iterator e = s.end();
37 if (*b == Ch('\0')) result += Ch('\\'), result += Ch('0');
38 else if (*b == Ch('\a')) result += Ch('\\'), result += Ch('a');
39 else if (*b == Ch('\b')) result += Ch('\\'), result += Ch('b');
40 else if (*b == Ch('\f')) result += Ch('\\'), result += Ch('f');
41 else if (*b == Ch('\n')) result += Ch('\\'), result += Ch('n');
42 else if (*b == Ch('\r')) result += Ch('\\'), result += Ch('r');
43 else if (*b == Ch('\v')) result += Ch('\\'), result += Ch('v');
44 else if (*b == Ch('"')) result += Ch('\\'), result += Ch('"');
45 else if (*b == Ch('\\')) result += Ch('\\'), result += Ch('\\');
54 bool is_simple_key(const std::basic_string<Ch> &key)
56 const static std::basic_string<Ch> chars = convert_chtype<Ch, char>(" \t{};\n\"");
57 return !key.empty() && key.find_first_of(chars) == key.npos;
61 bool is_simple_data(const std::basic_string<Ch> &data)
63 const static std::basic_string<Ch> chars = convert_chtype<Ch, char>(" \t{};\n\"");
64 return !data.empty() && data.find_first_of(chars) == data.npos;
68 void write_info_helper(std::basic_ostream<typename Ptree::key_type::value_type> &stream,
71 const info_writer_settings<typename Ptree::key_type::value_type> &settings)
75 typedef typename Ptree::key_type::value_type Ch;
80 if (!pt.data().empty())
82 std::basic_string<Ch> data = create_escapes(pt.template get_value<std::basic_string<Ch> >());
83 if (is_simple_data(data))
84 stream << Ch(' ') << data << Ch('\n');
86 stream << Ch(' ') << Ch('\"') << data << Ch('\"') << Ch('\n');
89 stream << Ch(' ') << Ch('\"') << Ch('\"') << Ch('\n');
101 write_info_indent( stream, indent, settings);
102 stream << Ch('{') << Ch('\n');
106 typename Ptree::const_iterator it = pt.begin();
107 for (; it != pt.end(); ++it)
111 std::basic_string<Ch> key = create_escapes(it->first);
112 write_info_indent( stream, indent+1, settings);
113 if (is_simple_key(key))
116 stream << Ch('\"') << key << Ch('\"');
118 // Output data and children
119 write_info_helper(stream, it->second, indent + 1, settings);
126 write_info_indent( stream, indent, settings);
127 stream << Ch('}') << Ch('\n');
133 // Write ptree to info stream
134 template<class Ptree>
135 void write_info_internal(std::basic_ostream<typename Ptree::key_type::value_type> &stream,
137 const std::string &filename,
138 const info_writer_settings<typename Ptree::key_type::value_type> &settings)
140 write_info_helper(stream, pt, -1, settings);
142 BOOST_PROPERTY_TREE_THROW(info_parser_error("write error", filename, 0));