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        "author": "Joe Cross",
        "author_email": "joe.mcross@gmail.com",
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            "Intended Audience :: Developers",
            "License :: OSI Approved :: MIT License",
            "Operating System :: OS Independent",
            "Programming Language :: Python",
            "Programming Language :: Python :: 3",
            "Programming Language :: Python :: 3.2",
            "Programming Language :: Python :: 3.3",
            "Programming Language :: Python :: 3.4",
            "Topic :: Software Development :: Libraries",
            "Topic :: Software Development :: Libraries :: Python Modules"
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        "description": ".. image:: https://img.shields.io/travis/numberoverzero/declare/master.svg?style=flat-square\n    :target: https://travis-ci.org/numberoverzero/declare\n.. image:: https://img.shields.io/codecov/c/github/numberoverzero/declare/master.svg?style=flat-square\n    :target: https://codecov.io/gh/numberoverzero/declare/branch/master\n.. image:: https://img.shields.io/pypi/v/declare.svg?style=flat-square\n    :target: https://pypi.python.org/pypi/declare\n.. image:: https://img.shields.io/pypi/status/declare.svg?style=flat-square\n    :target: https://pypi.python.org/pypi/declare\n.. image:: https://img.shields.io/github/issues-raw/numberoverzero/declare.svg?style=flat-square\n    :target: https://github.com/numberoverzero/declare/issues\n.. image:: https://img.shields.io/pypi/l/declare.svg?style=flat-square\n    :target: https://github.com/numberoverzero/declare/blob/master/LICENSE\n\nDeclarative scaffolding for frameworks\n\nInstallation\n============\n\n``pip install declare``\n\nGetting Started\n===============\n\nLet's build a quick model for Minecraft blocks::\n\n    from declare import Model, Field, TypeDefinition\n    import json\n\n    # Wire format is json:\n    # {\n    #   \"type\": int     <- maps to enum\n    #   \"position\": str <- packed x:y:z\n    # }\n\n    class BlockType(TypeDefinition):\n        types = {\n            0: \"Grass\",\n            1: \"Stone\",\n            2: \"Diamond\"\n        }\n        def load(self, value, context):\n            return BlockType.types[value]\n\n        def dump(self, value, context):\n            # TODO: index types by value for O(1) lookup\n            for tid, name in BlockType.types.items():\n                if value == name:\n                    return tid\n\n\n    class Position(TypeDefinition):\n        ''' [x, y, z] <--> \"x:y:z\" '''\n        def load(self, value, context):\n            return [int(v) for v in value.split(':')]\n\n        def dump(self, value, context):\n            return ':'.join(str(v) for v in value)\n\n\n    class Block(Model):\n        type = Field(BlockType)\n        position = Field(Position)\n\n        @classmethod\n        def load(cls, wire):\n            fields = cls.Meta.fields_by_model_name\n            engine = cls.Meta.type_engine\n            wire = json.loads(wire)\n            kwargs = {}\n            for name, field in fields.items():\n                kwargs[name] = engine.load(field.typedef, wire[name], {})\n            return cls(**kwargs)\n\n        @classmethod\n        def dump(cls, obj):\n            fields = cls.Meta.fields_by_model_name\n            engine = cls.Meta.type_engine\n            kwargs = {}\n            for name, field in fields.items():\n                kwargs[name] = engine.dump(\n                    field.typedef, getattr(obj, name), {})\n            return json.dumps(kwargs)\n\n\nLet's set up our request handler to use these blocks::\n\n    from bottle import route, request\n\n    @route('/diamond_check')\n    def func():\n        wire = request.json\n        block = Block.load(wire)\n        if block.type == \"Diamond\":\n            return {\"diamond\": True, \"position\": block.position}\n        return {\"diamond\": False}\n\n\nAlternatively, creating a diamond::\n\n    @route('/make_diamond')\n    def func():\n        wire = request.json\n        position = Position.load(wire)\n        block = Block(type=\"Diamond\", position=position)\n        return Block.dump(block)\n\n\nNested Models\n=============\n\nModels are instances of TypeDefinitions, too.  That means models can be used\nas fields, making recursive load/dump easy::\n\n    class List(TypeDefinition):\n        ''' Adapter for lists of objects '''\n        def load(self, value, context):\n            return [self.typedef.load(v, context) for v in value]\n        def dump(self, value, context):\n            return [self.typedef.dump(v, context) for v in value]\n\n\n    class Region(Model):\n        blocks = Field(List(Block))\n\n        @classmethod\n        def load(cls, wire):\n            fields = cls.Meta.fields_by_model_name\n            engine = cls.Meta.type_engine\n            wire = json.loads(wire)\n            kwargs = {}\n            for name, field in fields.items():\n                kwargs[name] = engine.load(field.typedef, wire[name], {})\n            return cls(**kwargs)\n\n        @classmethod\n        def dump(cls, obj):\n            fields = cls.Meta.fields_by_model_name\n            engine = cls.Meta.type_engine\n            kwargs = {}\n            for name, field in fields.items():\n                kwargs[name] = engine.dump(\n                    field.typedef, getattr(obj, name), {})\n            return json.dumps(kwargs)\n\n\nIn fact, the same load/dump code from ``Block`` is usable here, since we're\njust going to be loading/dumping from json.  When the type engine looks up the\nload/dump functions for the ``List(Block)`` type, it will iteratively load/dump\neach block using the Block.load and Block.dump methods.\n\n\n",
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