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        "description": "\nRBNF: Parser Generator for Context Sensitive Grammars\n==========================================================\n\n[![Build Status](https://travis-ci.org/thautwarm/RBNF.svg?branch=master)](https://travis-ci.org/thautwarm/RBNF)\n[![PyPI version](https://img.shields.io/pypi/v/RBNF.svg)](https://pypi.python.org/pypi/rbnf)\n[![MIT License](https://img.shields.io/badge/license-MIT-Green.svg?style=flat)](https://github.com/thautwarm/RBNF/blob/master/LICENSE)\n\nTutorials\n---------------\n\nSee [Jupyter Notebook](https://github.com/thautwarm/RBNF/blob/master/tutorials.ipynb).\n\nPreview\n---------------\n\n- `rbnf.zero`: solution to processing complex texts. Similar to `re`.\n\n    See source file [Poly.rbnf](https://github.com/thautwarm/RBNF/blob/master/tests/poly.rbnf).\n\n    ```python\n    # parse polynomials from text.\n    import rbnf.zero as ze\n    ze_exp = ze.compile(\"import poly.[*]\", use='Poly')\n    print(ze_exp.match(\"2x^2 + 3 + 4 - 7 x^5 + 4 x + 5 x ^2 - x + 7 x ^ 11\").result)\n    ```\n\n    Then we got output `[(0, 7), (1, 3), (2, 7), (5, -7), (11, 7)]`.\n\n- `CLI tool chains`:\n\n     ```shell\n\n     \u03bb rbnf.exe --help\n    Available commands:\n      cc\n          rbnf source code compiler.\n\n      - filename(positional or keyword arg)        : input source file\n      - output(positional or keyword arg) = None   : output file name. default to be ...\n      - name(positional or keyword arg) = 'unname' : name of language\n\n      run\n          You can apply immediate tests on your parser.\n          P.S: use `--opt` option takes longer starting time.\n\n      - filename(positional or keyword arg)    : python file generated by `rbnf` command, or rbnf sour file\n      - opt(positional or keyword arg) = False : optimize switch\n\n\n\n    \u03bb printf \"ignore [space]\\nspace := R'\\s+'\\nterm := R'[^\\s\\(\\)]+'\\nsexpr ::= '(' sexpr* ')' | term\" > lisp.rbnf\n    \u03bb rbnf run lisp\n\n    type `:i` to switch between python mode and parsing mode.\n    The last result of parsing is stored as symbol `res`.\n\n    runbnf> (add 1 (add 2))\n\n    sexpr[\n           Tokenizer(name='auto_const', value='(', lineno=0, colno=0)\n           sexpr[\n                 Tokenizer(name='term', value='add', lineno=0, colno=1)\n           ]\n           sexpr[\n                 Tokenizer(name='term', value='1', lineno=0, colno=5)\n           ]\n           sexpr[\n                  Tokenizer(name='auto_const', value='(', lineno=0, colno=7)\n                  sexpr[\n                        Tokenizer(name='term', value='add', lineno=0, colno=8)\n                  ]\n                  sexpr[\n                        Tokenizer(name='term', value='2', lineno=0, colno=12)\n                  ]\n                  Tokenizer(name='auto_const', value=')', lineno=0, colno=13)\n           ]\n           Tokenizer(name='auto_const', value=')', lineno=0, colno=14)\n    ]\n\n    runbnf> exit\n\n     \u03bb rbnf cc lisp.bnf -output lisp.py\n     ...\n     ```\n\nRelated\n----------------------\n\n- RBNF could help to develop type checker:\n\n   [https://github.com/thautwarm/reFining](https://github.com/thautwarm/reFining])\n\n   ```\n   python cli.py\n\n   reF> let x: 'a = 1 in\n         fn x: 'a -> x ;;\n   =>  (int`2 => int`2)\n   ```\n\n- RBNF could help to develop programming languages:\n\n    [https://github.com/thautwarm/rmalt](https://github.com/thautwarm/rmalt)\n\n    ```\n    python test.py\n\n    malt> let (%+) = (l, r) -> (l + r) % r;;\n    malt> let f = (a, b) -> a  + b;;\n    malt> f 1 2;;\n    =>  3\n    malt> f 1\n          ;;\n    =>  Fn(b)<id=3061211909288>\n    malt> infix %+ 5;;\n    =>  5\n    malt> let (%+) = (l, r) -> (l % r) + r;;\n    malt> 5 %+ 6;;\n    =>  11\n\n    ```\n\n\nEDSL in Python\n---------------------\n\n\n**To be continue**.\n\n\n`RBNF`'s compiler(rbnf -> python or others) relies on bootstrap.\n\nActually, in current version, bootstrap of RBNF is implemented in EDSL.\n\nSee [rbnf bootstrap in Python](https://github.com/thautwarm/RBNF/blob/master/rbnf/bootstrap/rbnf.py).\n\nA snippet could be previewed here.\n\n```python\n\nrbnf = Language(\"RBNF\")\n\n...\n\n@rbnf\nclass Primitive(Parser):\n\n    @classmethod\n    def bnf(cls):\n        # @formatter:off\n        return optimize(\n                 C('(') + Or @ \"or_\" + C(')')\n               | C('[') + Or @ \"optional\" + C(']')\n               | Name @ \"name\"\n               | Str  @ \"str\")\n        # @formatter:on\n\n     @classmethod\n    def rewrite(cls, state: State):\n        get = state.ctx.get\n        or_: Parser = get('or_')\n        optional: Parser = get('optional')\n        ...\n\n...\n\n```\n\n\nOther backend\n----------------\n\nTo be continue.\n\n\n\n\n\n",
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