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json spirit

A json library using Boost.Spirit V2 and X3 for the parser.

The primary goal of the json spirit library was to create a conformant json parser that resulted in a json object that could be manipulated much like in javascript or python.

Quick Example

// the json::value is the primary data type
// you can simply assign it values

json::value v = 42;
v = "foo";
v = true;
v = 14.5;

// you can also treat the json::value like an array
v[0] = "foo";
v[1] = true;

// or a json object
v["foo"] = 42;
v["bar"] = false;

// and of course, these can be more complex
json::value z;
z[4] = v;

std::cout << z << "\n";

which would result in:

[null, null, null, null, {"bar":false, "foo":42}]

Building

We have CMake and Boost.Build support.

CMake

For CMake, do this to build the library:

cd json_spirit
mkdir build
cd build
cmake ..
make

You may specify the version of Boost to build against by defining BOOST_ROOT on the CMake command line like this:

cmake -DBOOST_ROOT=/sandbox/boost/trunk ..

To run the unit tests:

make test

Using in another CMakeLists.txt

One way to use the json library in another CMake project is to treat it as an external project.

Here is an example of how to do that:

  # Find json spirit
  ExternalProject_Add(
    dependency.json_spirit
    URL ${CMAKE_CURRENT_SOURCE_DIR}/vendor/json_spirit
    PREFIX ${CMAKE_CURRENT_BINARY_DIR}/json_spirit
    CMAKE_COMMAND ${CMAKE_COMMAND}
    CMAKE_GENERATOR ${CMAKE_GENERATOR}
    CMAKE_ARGS ${BOOST_CMAKE_ARGS} -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}
    BUILD_COMMAND ${CMAKE_COMMAND} --build <BINARY_DIR> --config $<CONFIG> --target json
    INSTALL_COMMAND "")
  
  ExternalProject_Get_Property(dependency.json_spirit SOURCE_DIR BINARY_DIR)
  set(INSTALL_DIR ${BINARY_DIR}/${CMAKE_CFG_INTDIR})
  
  add_library(json_spirit STATIC IMPORTED)
  
  set(libjson_name "${CMAKE_STATIC_LIBRARY_PREFIX}json${CMAKE_STATIC_LIBRARY_SUFFIX}")
  set_property(
    TARGET json_spirit
    PROPERTY IMPORTED_LOCATION ${INSTALL_DIR}/${libjson_name})
  
  set_property(
    TARGET json_spirit
    PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${SOURCE_DIR})
  
  add_dependencies(json_spirit dependency.json_spirit)

and for your specific target you can:

    target_link_libraries(my_target
                          json_spirit
                          .... other libraries ... )

Boost.Build

For Boost.Build, we assume either your user-config.jam file has a line like this:

use-project /boost	:	/sandbox/boost/trunk ;

or you have set the environment variable BOOST_ROOT to the location of the boost version you want to use.

You can build the library via:

cd json_spirit
bjam json

You can build the tests via:

cd json_spirit/libs/json/test
bjam

Bazel Build

For bazel depending on this library using the bazel build system add the following to your WORKSPACE file

load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")

git_repository(
  name = "com_github_cierelabs_json_spirit",
  remote = "https://github.com/cierelabs/json_spirit",
  commit = "371c3b5d283f6272860d4d2eac996591ffad259c"
)

load("@com_github_cierelabs_json_spirit//:json_spirit_deps.bzl", "json_spirit_deps")

json_spirit_deps()

load("@com_github_nelhage_rules_boost//:boost/boost.bzl", "boost_deps")

boost_deps()

The library can now be depended on using the target @com_github_cierelabs_json_spirit:json_spirit e.g.

cc_library(
  name = "some_lib",
  deps = ["@com_github_cierelabs_json_spirit:json_spirit"],
  # ...
)

Documentation

Coming soon. Unit tests located in libs/json/test/*.cpp provide a good starting point for exploration of the functionality.

Licensing

json_spirit is licensed under the Boost Software License. See LICENSE_1_0.txt for details.