15 February 2013

JSEN: JavaScript Expression Notation

That idea I was talking about yesterday? Storing mathematical expressions as JSON? I went ahead and made it as a TypeScript project and released it on GitHub:


JavaScript Expression Notation (JSEN)



Still need to complete the unit test coverage and add a couple more features. I made a change from my original post to the syntax for namespace references. (The reason? I realized I needed to be able to use "*" as a local identifier for multiplication.) They work within Namespace declaration blocks, but I need to make them work at the higher level of Namespaces declaration blocks as well. (Done.) I also want to allow functions to be used as namespaces. (Done.)

This is possible right now:

jsen.decl('my-fake-namespace', {
   'js': 'http://ecma-international.org/ecma-262/5.1',

   'x': 10,
   'y': ['js:Array', 1, 2, 3],
   'z': ['js:[]', 'y', 1]
});

jsen.eval('my-fake-namespace', 'x'); // 10
jsen.eval('my-fake-namespace', 'y'); // [1, 2, 3]
jsen.eval('my-fake-namespace', 'z'); // 2

jsen.expr('my-fake-namespace', 'x'); // 10 // Deprecated
jsen.expr('my-fake-namespace', 'y'); // Deprecated
    // ["http://ecma-international.org/ecma-262/5.1:Array", 1, 2, 3]
jsen.expr('my-fake-namespace', 'z'); // Deprecated
    // ["http://ecma-international.org/ecma-262/5.1:[]", "y", 1]

Eventually something like this will be possible as well:


jsen.namesonnodes.decl();

jsen.decl({
    'char': 'my-character-states-space',
    'non':  'http://namesonnodes.org/ns/math/2013:',
    'unit': 'my-unit-nomenclature-space',

    'http://namesonnodes.org/ns/math/2013':
    {
        'phylogeny': ['non:dag',
            ['non:arc',
                'unit:0',
                'unit:Ornithorhynchus anatinus'
            ],
            ['non:arc',
                'unit:0',
                'unit:1'
            ],
            ['non:arc',
                'unit:1',
                'unit:Canis lupus'
            ],
            ['non:arc',
                'unit:1',
                'unit:Homo sapiens'
            ]
        ]
    },

    'my-character-states-space':
    {
        'extant':    ['non:union',
                         'unit:Homo sapiens',
                         'unit:Canis lupus',
                         'unit:Ornithorhynchus anatinus'
                     ],
        'placentum': ['non:union',
                         'unit:Homo sapiens',
                         'unit:Canis lupus',
                         'unit:1'
                     ]
    },

    'my-phylogenetic-nomenclature-space':
    {
        'Apo-Placentalia': ['non:clade',
                               ['non:synprc',
                                   'char:placentum',
                                   'unit:Homo sapiens'
                               ]
                           ],
        'Mammalia':        ['non:clade',
                               ['non:union',
                                   'unit:Homo sapiens',
                                   'unit:Ornithorhynchus anatinus'
                               ]
                           ],
        'Placentalia':     ['non:crown', 'Apo-Placentalia'],
        'Prototheria':     ['non:clade',
                               ['non:branch',
                                   'unit:Ornithorhynchus anatinus',
                                   'unit:Homo sapiens'
                               ]
                           ],
        'Theriimorpha':    ['non:clade',
                               ['non:branch',
                                   'unit:Homo sapiens',
                                   'unit:Ornithorhynchus anatinus'
                               ]
                           ],
        'pan-Theria':      'Theriimorpha',
        'pan-Monotremata': 'Prototheria'
    },

    'my-unit-nomenclature-space': jsen.namesonnodes.unit
});

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