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+// ----------------------------------------------------------------------------
+// Copyright (C) 2002-2006 Marcin Kalicinski
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// For more information, see www.boost.org
+// ----------------------------------------------------------------------------
+#ifndef BOOST_PROPERTY_TREE_DETAIL_JSON_PARSER_READ_HPP_INCLUDED
+#define BOOST_PROPERTY_TREE_DETAIL_JSON_PARSER_READ_HPP_INCLUDED
+
+//#define BOOST_SPIRIT_DEBUG
+
+#include <boost/property_tree/ptree.hpp>
+#include <boost/property_tree/detail/ptree_utils.hpp>
+#include <boost/property_tree/detail/json_parser_error.hpp>
+#include <boost/spirit/include/classic.hpp>
+#include <boost/limits.hpp>
+#include <string>
+#include <locale>
+#include <istream>
+#include <vector>
+#include <algorithm>
+
+namespace boost { namespace property_tree { namespace json_parser
+{
+
+ ///////////////////////////////////////////////////////////////////////
+ // Json parser context
+
+ template<class Ptree>
+ struct context
+ {
+
+ typedef typename Ptree::key_type::value_type Ch;
+ typedef std::basic_string<Ch> Str;
+ typedef typename std::vector<Ch>::iterator It;
+
+ Str string;
+ Str name;
+ Ptree root;
+ std::vector<Ptree *> stack;
+
+ struct a_object_s
+ {
+ context &c;
+ a_object_s(context &c): c(c) { }
+ void operator()(Ch) const
+ {
+ if (c.stack.empty())
+ c.stack.push_back(&c.root);
+ else
+ {
+ Ptree *parent = c.stack.back();
+ Ptree *child = &parent->push_back(std::make_pair(c.name, Ptree()))->second;
+ c.stack.push_back(child);
+ c.name.clear();
+ }
+ }
+ };
+
+ struct a_object_e
+ {
+ context &c;
+ a_object_e(context &c): c(c) { }
+ void operator()(Ch) const
+ {
+ BOOST_ASSERT(c.stack.size() >= 1);
+ c.stack.pop_back();
+ }
+ };
+
+ struct a_name
+ {
+ context &c;
+ a_name(context &c): c(c) { }
+ void operator()(It, It) const
+ {
+ c.name.swap(c.string);
+ c.string.clear();
+ }
+ };
+
+ struct a_string_val
+ {
+ context &c;
+ a_string_val(context &c): c(c) { }
+ void operator()(It, It) const
+ {
+ BOOST_ASSERT(c.stack.size() >= 1);
+ c.stack.back()->push_back(std::make_pair(c.name, Ptree(c.string)));
+ c.name.clear();
+ c.string.clear();
+ }
+ };
+
+ struct a_literal_val
+ {
+ context &c;
+ a_literal_val(context &c): c(c) { }
+ void operator()(It b, It e) const
+ {
+ BOOST_ASSERT(c.stack.size() >= 1);
+ c.stack.back()->push_back(std::make_pair(c.name,
+ Ptree(Str(b, e))));
+ c.name.clear();
+ c.string.clear();
+ }
+ };
+
+ struct a_char
+ {
+ context &c;
+ a_char(context &c): c(c) { }
+ void operator()(It b, It e) const
+ {
+ c.string += *b;
+ }
+ };
+
+ struct a_escape
+ {
+ context &c;
+ a_escape(context &c): c(c) { }
+ void operator()(Ch ch) const
+ {
+ switch (ch)
+ {
+ case Ch('\"'): c.string += Ch('\"'); break;
+ case Ch('\\'): c.string += Ch('\\'); break;
+ case Ch('/'): c.string += Ch('/'); break;
+ case Ch('b'): c.string += Ch('\b'); break;
+ case Ch('f'): c.string += Ch('\f'); break;
+ case Ch('n'): c.string += Ch('\n'); break;
+ case Ch('r'): c.string += Ch('\r'); break;
+ case Ch('t'): c.string += Ch('\t'); break;
+ default: BOOST_ASSERT(0);
+ }
+ }
+ };
+
+ struct a_unicode
+ {
+ context &c;
+ a_unicode(context &c): c(c) { }
+ void operator()(unsigned long u) const
+ {
+ //u = (std::min)(u, static_cast<unsigned long>((std::numeric_limits<Ch>::max)()));
+ c.string += Ch(u);
+ }
+ };
+
+ };
+
+ ///////////////////////////////////////////////////////////////////////
+ // Json grammar
+
+ template<class Ptree>
+ struct json_grammar :
+ public boost::spirit::classic::grammar<json_grammar<Ptree> >
+ {
+
+ typedef context<Ptree> Context;
+ typedef typename Ptree::key_type::value_type Ch;
+
+ mutable Context c;
+
+ template<class Scanner>
+ struct definition
+ {
+
+ boost::spirit::classic::rule<Scanner>
+ root, object, member, array, item, value, string, number;
+ boost::spirit::classic::rule<
+ typename boost::spirit::classic::lexeme_scanner<Scanner>::type>
+ character, escape;
+
+ definition(const json_grammar &self)
+ {
+
+ using namespace boost::spirit::classic;
+ // There's a boost::assertion too, so another explicit using
+ // here:
+ using boost::spirit::classic::assertion;
+
+ // Assertions
+ assertion<std::string> expect_root("expected object or array");
+ assertion<std::string> expect_eoi("expected end of input");
+ assertion<std::string> expect_objclose("expected ',' or '}'");
+ assertion<std::string> expect_arrclose("expected ',' or ']'");
+ assertion<std::string> expect_name("expected object name");
+ assertion<std::string> expect_colon("expected ':'");
+ assertion<std::string> expect_value("expected value");
+ assertion<std::string> expect_escape("invalid escape sequence");
+
+ // JSON grammar rules
+ root
+ = expect_root(object | array)
+ >> expect_eoi(end_p)
+ ;
+
+ object
+ = ch_p('{')[typename Context::a_object_s(self.c)]
+ >> (ch_p('}')[typename Context::a_object_e(self.c)]
+ | (list_p(member, ch_p(','))
+ >> expect_objclose(ch_p('}')[typename Context::a_object_e(self.c)])
+ )
+ )
+ ;
+
+ member
+ = expect_name(string[typename Context::a_name(self.c)])
+ >> expect_colon(ch_p(':'))
+ >> expect_value(value)
+ ;
+
+ array
+ = ch_p('[')[typename Context::a_object_s(self.c)]
+ >> (ch_p(']')[typename Context::a_object_e(self.c)]
+ | (list_p(item, ch_p(','))
+ >> expect_arrclose(ch_p(']')[typename Context::a_object_e(self.c)])
+ )
+ )
+ ;
+
+ item
+ = expect_value(value)
+ ;
+
+ value
+ = string[typename Context::a_string_val(self.c)]
+ | (number | str_p("true") | "false" | "null")[typename Context::a_literal_val(self.c)]
+ | object
+ | array
+ ;
+
+ number
+ = !ch_p("-") >>
+ (ch_p("0") | (range_p(Ch('1'), Ch('9')) >> *digit_p)) >>
+ !(ch_p(".") >> +digit_p) >>
+ !(chset_p(detail::widen<Ch>("eE").c_str()) >>
+ !chset_p(detail::widen<Ch>("-+").c_str()) >>
+ +digit_p)
+ ;
+
+ string
+ = +(lexeme_d[confix_p('\"', *character, '\"')])
+ ;
+
+ character
+ = (anychar_p - "\\" - "\"")
+ [typename Context::a_char(self.c)]
+ | ch_p("\\") >> expect_escape(escape)
+ ;
+
+ escape
+ = chset_p(detail::widen<Ch>("\"\\/bfnrt").c_str())
+ [typename Context::a_escape(self.c)]
+ | 'u' >> uint_parser<unsigned long, 16, 4, 4>()
+ [typename Context::a_unicode(self.c)]
+ ;
+
+ // Debug
+ BOOST_SPIRIT_DEBUG_RULE(root);
+ BOOST_SPIRIT_DEBUG_RULE(object);
+ BOOST_SPIRIT_DEBUG_RULE(member);
+ BOOST_SPIRIT_DEBUG_RULE(array);
+ BOOST_SPIRIT_DEBUG_RULE(item);
+ BOOST_SPIRIT_DEBUG_RULE(value);
+ BOOST_SPIRIT_DEBUG_RULE(string);
+ BOOST_SPIRIT_DEBUG_RULE(number);
+ BOOST_SPIRIT_DEBUG_RULE(escape);
+ BOOST_SPIRIT_DEBUG_RULE(character);
+
+ }
+
+ const boost::spirit::classic::rule<Scanner> &start() const
+ {
+ return root;
+ }
+
+ };
+
+ };
+
+ template<class It, class Ch>
+ unsigned long count_lines(It begin, It end)
+ {
+ return static_cast<unsigned long>(std::count(begin, end, Ch('\n')) + 1);
+ }
+
+ template<class Ptree>
+ void read_json_internal(std::basic_istream<typename Ptree::key_type::value_type> &stream,
+ Ptree &pt,
+ const std::string &filename)
+ {
+
+ using namespace boost::spirit::classic;
+ typedef typename Ptree::key_type::value_type Ch;
+ typedef typename std::vector<Ch>::iterator It;
+
+ // Load data into vector
+ std::vector<Ch> v(std::istreambuf_iterator<Ch>(stream.rdbuf()),
+ std::istreambuf_iterator<Ch>());
+ if (!stream.good())
+ BOOST_PROPERTY_TREE_THROW(json_parser_error("read error", filename, 0));
+
+ // Prepare grammar
+ json_grammar<Ptree> g;
+
+ // Parse
+ try
+ {
+ parse_info<It> pi = parse(v.begin(), v.end(), g,
+ space_p | comment_p("//") | comment_p("/*", "*/"));
+ if (!pi.hit || !pi.full)
+ BOOST_PROPERTY_TREE_THROW((parser_error<std::string, It>(v.begin(), "syntax error")));
+ }
+ catch (parser_error<std::string, It> &e)
+ {
+ BOOST_PROPERTY_TREE_THROW(json_parser_error(e.descriptor, filename, count_lines<It, Ch>(v.begin(), e.where)));
+ }
+
+ // Swap grammar context root and pt
+ pt.swap(g.c.root);
+
+ }
+
+} } }
+
+#endif
+
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