# scientific-notation: Scientific notation intended for tokenization

This library provides a type used to represent a number in
scientific notation. This is most frequently useful when
tokenizing or parsing a language. Languages like JSON and SQL
support numberic literals written in scientific notation, even
though backends frequently reject numbers outside a given range.
This library provides a compact representation of numbers in
scientific notation. In the common case of the coefficient and
then exponent each being small enough to be represented by a
machine word, this library avoids the need for any indirections
to retrieve the number. Consider some tokenization scheme:
`data Token = ... | Number {--} !Scientific`.
In this case, the unboxed coefficient and exponent are unpacked
into the `Number`

data constructor if they can each be represented
by a machine word.

The internal representation does not normalize numbers. That is,
parsing `300e-2`

resulting in a representation that uses `300`

and
`-2`

rather than `3`

and `0`

.
This work is deferred with the expectation that a number in scientific
notation is consumed either zero or one times. This library is not
optimized for use-cases that consume a `Scientific`

more than once
since normalization is reapplied every time.

The primary library that operates in this same space is `scientific`

.
Compared to `scientific`

, this library distinguishes itself from
`scientific`

in the following ways:

Correctness:

`scientific`

does not correctly handle large exponents. See issue #62.Parsing: The

`scientific-notation`

parser outperforms the`scientific`

parser that ships with`aeson`

by a factor of five on small numbers.

Versions [faq] | 0.1.0.0, 0.1.0.1, 0.1.1.0 |
---|---|

Change log | CHANGELOG.md |

Dependencies | base (>=4.12 && <5), bytesmith (==0.3.*) [details] |

License | BSD-3-Clause |

Copyright | 2019 Andrew Martin |

Author | Andrew Martin |

Maintainer | andrew.thaddeus@gmail.com |

Category | Data |

Home page | https://github.com/andrewthad/scientific-notation |

Bug tracker | https://github.com/andrewthad/scientific-notation/issues |

Uploaded | by andrewthad at Wed Nov 6 21:09:39 UTC 2019 |

Distributions | NixOS:0.1.1.0 |

Downloads | 269 total (73 in the last 30 days) |

Rating | (no votes yet) [estimated by Bayesian average] |

Your Rating | |

Status | Docs available [build log] Last success reported on 2019-11-06 [all 1 reports] |

## Downloads

- scientific-notation-0.1.1.0.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)