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ca_mojo

A simple library written in pure Mojo🔥, the new faster, compiled, and stricter superset of Python, by Modular.

The code is written against the latest nightly build of Mojo. Use modular update nightly/mojo to get the latest version.

Current Mojo version is mojo 2024.5.2605 (9c328b12).

Features include:

fu - float utils

Contains:

  • fn str_to_float(s: String) raises -> Float64:
  • fn format_float(f: Float64, dec_places: Int) -> String:
    • format_float rounds up on half, so format_float(3.14159, 4) becomes 3.1416.

test_float_utils.mojo

Tests for fu.str_to_float and fu.format_float.

su - string utils

Contains:

  • fn endswith(input_string: String, suffix: String, start: Int = 0, owned end: Int = -1) raises -> Bool:
  • fn trim(s: String, leading: String, trailing: String) -> String:
  • fn find(s: String, sub: String) -> Int:
  • fn split(s: String, sep: String) -> List:

test_string_utils.mojo

Only tests for fn split(s: String, sep: String) -> List: at the moment.

Matrix

A struct which represents a simple 2 dimensional matrix capable of storing Float64 numbers.

Contains many functions a lot of which have not even been tested casually, var alone by formal unit tests. Proceed with caution!

test_matrix.mojo

Only tests for initialising from string...

  • var m1 = Matrix("[[1.1, 1.1, 1.1], [2.2, 2.2, 2.2], [3.3, 3.3, 3.3], [4.4, 4.4, 4.4]]") and for adding...
  • var m3 = m1 + m2 and for converting back to string...
  • return m3.string_to(1) == "[[2.2, 2.2, 2.2], [3.3, 3.3, 3.3], [4.4, 4.4, 4.4], [5.5, 5.5, 5.5]]"

TeeTest

A modest test framework. For example...

from teetest import TeeTest
from ca_lib.float_utils import fu

fn test_str_to_float_to_rounded_string() raises -> Tuple[Bool, StringLiteral]:
  alias pi_str = "3.1415926234534563"
  var pi = fu.str_to_float(pi_str)
  var assert1 = fu.format_float(pi, 5) == "3.14159"
  var assert2 = fu.format_float(pi, 6) == "3.141593"
  var assert3 = fu.format_float(pi, 7) == "3.1415926"
  return assert1 and assert2 and assert3,
    __source_location().function_name

fn main():
  TeeTest(
    test_str_to_float_to_rounded_string,
  ).run_tests()

preset_parser

found in ca_mojo/ca_lib/preset_parser/presetparser.mojo

A proof-of-concept for using Mojo for binary file reading.

It parses the initial metadata found in a Bitwig .bwpreset file and displays it to the console.

To save you from too much folder diving, you can run it from the root folder with...

Usage: mojo parser.mojo <path-to-preset-file>

Eg: mojo parser.mojo ./Diffusion.bwpreset or: mojo parser.mojo ./Binaural_Organ_Device.bwpreset

It uses some path related functions in ca_mojo/ca_lib/sysutils.

In the file, parser.mojo, you can set debug = True to get more information about the parsing process.

  var pp = presetparser.PresetParser()
  pp.debug = False
  pp.process_preset(filename)
  print()