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