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CHANGELOG.md

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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

3.0 - 2024-03-31

Added

In the executable

  • Help command list
  • vars command shows active variables and functions.

In the library

  • Implement the Num trait for all signed integer primitives: i8, i16, i32, i64, i128, isize, and floats: f32 and f64.

Changed

  • Rewrote everything.
  • Lexer and Token architecture. Token now includes data about where it was located in the input, and how many characters it spans, which is useful for errors.
  • Parser and Expr usage. Overall code cleanup for the parser. Now uses a lookahead of 2 to solve ambiguity in parsing. See grammar.
  • ParseError is now descriptive, including the position and length of the problem, and even sometimes providing the offending token.
  • Computer<T> became Interpreter. A lot of changes were made to the interpreter, compared to the old Computer that you should check out when migrating.
  • Some semantic expressions like absolute value |x| and factorial x! are now translated to abs(x) and factorial(x), respectively.
  • The entire system still remains generic over which type of number is used, but I have simplified and extended the trait Num which a type must still implement to be used.
  • Update peekmore dependency 1.0.0 -> 1.3.0.

Removed

  • ans variable.
  • Global eval function and EvalError tagged enum. The "simplistic" interface was really quite complex and made things pretty complicated.

Fixed

  • Some bugs in the grammar that caused seemingly ordinary expressions to produce false results.
  • Determining at runtime whether x(5) is a function x with an argument 5 or a variable x times 5.
  • Functions were accidentally defined as the trait Fn, embarrassingly. I've updated functions, so they are now actually usable.

2.0 - 2019-06-21

Added

  • Real named functions! Functions are no longer tokens, and can now be created in a Computer, similar to variables.
let mut map = HashMap::<String, &'a Fn(f64) -> f64>::new();
map.insert("sqrt".to_owned(), &|n| n.sqrt());
  • RSC is fully generic, now! Types that can support addition, subtraction, and a couple functions necessary in the Num trait can be lexed, parsed, and computed with no changes to the RSC source code.
  • Getting the previous answer with the new ans variable. ans does not exist until you've run a calculation on a Computer already.
  • Factorial: 5! = 120

[1.2.1] - 2017-06-20

Removed

  • Tests from lib.rs removed so it can compile on stable compiler branches.

Versions prior to 1.2.1 had no changelog recordings, unfortunately.