move JSON rendering code out of container header file. prerequesite to #1261

2014-11-20 15:24:29 +01:00
parent 007eced326
commit 10d7a2396c
9 changed files with 190 additions and 141 deletions
@@ -0,0 +1,182 @@
+/*
+
+Copyright (c) 2013, Project OSRM, Dennis Luxen, others
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+Redistributions of source code must retain the above copyright notice, this list
+of conditions and the following disclaimer.
+Redistributions in binary form must reproduce the above copyright notice, this
+list of conditions and the following disclaimer in the documentation and/or
+other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+*/
+
+// based on
+// https://svn.apache.org/repos/asf/mesos/tags/release-0.9.0-incubating-RC0/src/common/json.hpp
+
+#ifndef JSON_RENDERER_HPP
+#define JSON_RENDERER_HPP
+
+#include "../DataStructures/JSONContainer.h"
+#include "cast.hpp"
+
+namespace JSON {
+
+struct Renderer : mapbox::util::static_visitor<>
+{
+    explicit Renderer(std::ostream &_out) : out(_out) {}
+
+    void operator()(const String &string) const { out << "\"" << string.value << "\""; }
+
+    void operator()(const Number &number) const
+    {
+        out.precision(10);
+        out << number.value;
+    }
+
+    void operator()(const Object &object) const
+    {
+        out << "{";
+        auto iterator = object.values.begin();
+        while (iterator != object.values.end())
+        {
+            out << "\"" << (*iterator).first << "\":";
+            mapbox::util::apply_visitor(Renderer(out), (*iterator).second);
+            if (++iterator != object.values.end())
+            {
+                out << ",";
+            }
+        }
+        out << "}";
+    }
+
+    void operator()(const Array &array) const
+    {
+        out << "[";
+        std::vector<Value>::const_iterator iterator;
+        iterator = array.values.begin();
+        while (iterator != array.values.end())
+        {
+            mapbox::util::apply_visitor(Renderer(out), *iterator);
+            if (++iterator != array.values.end())
+            {
+                out << ",";
+            }
+        }
+        out << "]";
+    }
+
+    void operator()(const True &) const { out << "true"; }
+
+    void operator()(const False &) const { out << "false"; }
+
+    void operator()(const Null &) const { out << "null"; }
+
+  private:
+    std::ostream &out;
+};
+
+struct ArrayRenderer : mapbox::util::static_visitor<>
+{
+    explicit ArrayRenderer(std::vector<char> &_out) : out(_out) {}
+
+    void operator()(const String &string) const
+    {
+        out.push_back('\"');
+        out.insert(out.end(), string.value.begin(), string.value.end());
+        out.push_back('\"');
+    }
+
+    void operator()(const Number &number) const
+    {
+        const std::string number_string = cast::double_fixed_to_string(number.value);
+        out.insert(out.end(), number_string.begin(), number_string.end());
+    }
+
+    void operator()(const Object &object) const
+    {
+        out.push_back('{');
+        auto iterator = object.values.begin();
+        while (iterator != object.values.end())
+        {
+            out.push_back('\"');
+            out.insert(out.end(), (*iterator).first.begin(), (*iterator).first.end());
+            out.push_back('\"');
+            out.push_back(':');
+
+            mapbox::util::apply_visitor(ArrayRenderer(out), (*iterator).second);
+            if (++iterator != object.values.end())
+            {
+                out.push_back(',');
+            }
+        }
+        out.push_back('}');
+    }
+
+    void operator()(const Array &array) const
+    {
+        out.push_back('[');
+        std::vector<Value>::const_iterator iterator;
+        iterator = array.values.begin();
+        while (iterator != array.values.end())
+        {
+            mapbox::util::apply_visitor(ArrayRenderer(out), *iterator);
+            if (++iterator != array.values.end())
+            {
+                out.push_back(',');
+            }
+        }
+        out.push_back(']');
+    }
+
+    void operator()(const True &) const
+    {
+        const std::string temp("true");
+        out.insert(out.end(), temp.begin(), temp.end());
+    }
+
+    void operator()(const False &) const
+    {
+        const std::string temp("false");
+        out.insert(out.end(), temp.begin(), temp.end());
+    }
+
+    void operator()(const Null &) const
+    {
+        const std::string temp("null");
+        out.insert(out.end(), temp.begin(), temp.end());
+    }
+
+  private:
+    std::vector<char> &out;
+};
+
+inline void render(std::ostream &out, const Object &object)
+{
+    Value value = object;
+    mapbox::util::apply_visitor(Renderer(out), value);
+}
+
+inline void render(std::vector<char> &out, const Object &object)
+{
+    Value value = object;
+    mapbox::util::apply_visitor(ArrayRenderer(out), value);
+}
+
+} // namespace JSON
+
+#endif // JSON_RENDERER_HPP