X-Git-Url: https://git.stg.codes/stg.git/blobdiff_plain/8c6fa3fbaccc22127280bf77a48fab5a3ee0716e..46b0747592074017ff0ea4b33d4a7194235886e5:/libs/json/parser.cpp

diff --git a/libs/json/parser.cpp b/libs/json/parser.cpp
new file mode 100644
index 00000000..57115048
--- /dev/null
+++ b/libs/json/parser.cpp
@@ -0,0 +1,123 @@
+/*
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/*
+ *    Author : Maxim Mamontov <faust@stargazer.dp.ua>
+ */
+
+#include "stg/json_parser.h"
+
+#include <yajl/yajl_parse.h>
+
+using STG::JSON::Parser;
+using STG::JSON::NodeParser;
+
+class Parser::Impl
+{
+    public:
+        Impl(NodeParser* topParser);
+        ~Impl()
+        {
+            yajl_free(m_handle);
+        }
+
+        bool append(const char* data, size_t size) { return yajl_parse(m_handle, reinterpret_cast<const unsigned char*>(data), size) == yajl_status_ok; }
+        bool last() { return yajl_complete_parse(m_handle) == yajl_status_ok; }
+
+        static int parseNull(void* ctx)
+        { return runParser(ctx, &NodeParser::parseNull); }
+        static int parseBoolean(void* ctx, int value)
+        { return runParser(ctx, &NodeParser::parseBoolean, value != 0); }
+        static int parseNumber(void* ctx, const char* value, size_t size)
+        { return runParser(ctx, &NodeParser::parseNumber, std::string(value, size)); }
+        static int parseString(void* ctx, const unsigned char* value, size_t size)
+        { return runParser(ctx, &NodeParser::parseString, std::string(reinterpret_cast<const char*>(value), size)); }
+        static int parseStartMap(void* ctx)
+        { return runParser(ctx, &NodeParser::parseStartMap); }
+        static int parseMapKey(void* ctx, const unsigned char* value, size_t size)
+        { return runParser(ctx, &NodeParser::parseMapKey, std::string(reinterpret_cast<const char*>(value), size)); }
+        static int parseEndMap(void* ctx)
+        { return runParser(ctx, &NodeParser::parseEndMap); }
+        static int parseStartArray(void* ctx)
+        { return runParser(ctx, &NodeParser::parseStartArray); }
+        static int parseEndArray(void* ctx)
+        { return runParser(ctx, &NodeParser::parseEndArray); }
+
+    private:
+        yajl_handle m_handle;
+        NodeParser* m_parser;
+
+        static yajl_callbacks callbacks;
+
+        static NodeParser& getParser(void* ctx) { return *static_cast<Impl*>(ctx)->m_parser; }
+        static bool runParser(void* ctx, NodeParser* (NodeParser::*func)())
+        {
+            Impl& p = *static_cast<Impl*>(ctx);
+            NodeParser* next = (p.m_parser->*func)();
+            if (next != NULL)
+                p.m_parser = next;
+            return next != NULL;
+        }
+        template <typename T>
+        static bool runParser(void* ctx, NodeParser* (NodeParser::*func)(const T&), const T& value)
+        {
+            Impl& p = *static_cast<Impl*>(ctx);
+            NodeParser* next = (p.m_parser->*func)(value);
+            if (next != NULL)
+                p.m_parser = next;
+            return next != NULL;
+        }
+};
+
+yajl_callbacks Parser::Impl::callbacks = {
+    Parser::Impl::parseNull,
+    Parser::Impl::parseBoolean,
+    NULL, // parsing of integer is done using parseNumber
+    NULL, // parsing of double is done using parseNumber
+    Parser::Impl::parseNumber,
+    Parser::Impl::parseString,
+    Parser::Impl::parseStartMap,
+    Parser::Impl::parseMapKey,
+    Parser::Impl::parseEndMap,
+    Parser::Impl::parseStartArray,
+    Parser::Impl::parseEndArray
+};
+
+Parser::Impl::Impl(NodeParser* topParser)
+    : m_handle(yajl_alloc(&callbacks, NULL, this)),
+      m_parser(topParser)
+{
+    yajl_config(m_handle, yajl_allow_multiple_values, 1);
+}
+
+Parser::Parser(NodeParser* topParser)
+    : m_impl(new Impl(topParser))
+{
+}
+
+Parser::~Parser()
+{
+}
+
+bool Parser::append(const char* data, size_t size)
+{
+    return m_impl->append(data, size);
+}
+
+bool Parser::last()
+{
+    return m_impl->last();
+}