package dtoa

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Converts OCaml floats into strings (doubles to ascii, "d to a"), using the efficient Grisu3 algorithm.

Install 

dune-project
 Dependency

github.com Readme Changelog Edit opam file Versions (5)

Authors

  1. M
    Marshall Roch <mroch@fb.com>

Maintainers

  1. M
    Marshall Roch <mroch@fb.com>

Sources

0.3.0.tar.gz
sha256=ddfb10cad93b80e3a4c4a384351974d46c92464246ea27d4b87280760dbe7174
md5=b974e5ef17b357b0e8fe24c1fcc472c5

Description

This is a (partial) port of Google's double-conversion library from C++ to C.

Published: 29 Sep 2017

README

ocaml-dtoa

This library provides a function that converts OCaml floats into strings, using the efficient Grisu3 algorithm.

The Grisu3 algorithm is described in "Printing Floating-Point Numbers Quickly And Accurately with Integers" by Florian Loitsch.

The implementation is adapted from double-conversion.

Current Status

Currently, this library exposes three functions:

  • ecma_string_of_float : float -> string: formats the float according to the ECMAScript specification's implementation of Number.prototype.toString. Notably, the output of this function is valid JSON.
  • shortest_string_of_float : float -> string: formats the float as compactly as possible, for example returning 123e6 instead of 123000000 or 1.23e+08.
  • g_fmt : float -> string: formats the float in the same way as David M. Gay's g_fmt.

The underlying fast_dtoa() function computes the significand and exponent, which are formatted by the above functions in dtoa_stubs.c. It is a port of the double-conversion library from C++ to C.

Many features of double-conversion are still missing. Patches are welcome!

License

ocaml-dtoa is MIT-licensed.

Author

ocaml-dtoa was created by Facebook for the Flow project.

Dependencies (2)

  1. jbuilder >= "1.0+beta7"
  2. ocaml >= "4.01.0"

Dev Dependencies (1)

  1. ounit with-test & >= "2.0.0"

Used by

None

Conflicts

None