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CHANGELOG.md

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Changelog

All the changes in this project are documented in this file.

The format follows Keep a Changelog.

Unreleased

Changed

  • Replaced default Rust hasher with a 80% faster one

[0.2.3] - 2025-10-25

Changed

  • README.md example code fixed.

[0.2.2] - 2025-09-13

Added

  • Added stack underflow error now is returned when an operator doesn't have enough elements in the stack.
  • Added support for logical operators, comparisons, and bitwise operations.
  • Added true and false keywords.

[0.2.1] - 2025-09-11

Added

  • Added support for the module operator (%)

Changed

  • Exponentiation (^) now uses powi internally in integer cases.
  • Parsing into RPN no longer makes an intermediate step through infix notation, improving parsing performance by 40–75%.

[0.2.0] - 2025-09-08

Added

  • Context::empty() method returning a context with EmptyResolvers
  • ExprCompiler and ExprEvaluator traits for the different Expr<T> types.
  • Ptr struct for handling raw pointers to resolver contents.
  • New Expr variant optimized for locked Contexts
  • New Expr variants optimized for indexed Resolvers

Fixed

  • Parsing of nested functions with multiple arguments.

Changed

  • Expr<T> now directly exposes the specialized eval() and compile() methods.
  • DefaultVarResolver and SmallVarResolver now allow keys other than String.
  • Improved public interfaces of several resolvers.
  • Resolvers can no longer be locked individually, locking is now managed by the owning Context.
  • ExprFn is no longer a type alias, it is now a struct.
  • Evaluating expressions now requires you to provide the stack.

Removed

  • Removed the Evaluator concept and the RpnEvaluator struct.

[0.1.1] - 2025-09-03

Fixed

  • Unary minus (-) operator no longer incorrectly takes precedence over exponentiation (^).

[0.1.0] - 2025-09-02

Added

  • Created RpnEvaluator able to evaluate mathematical expressions.
  • Support for variables and functions.
  • Support for the following operators:
    • Addition (+)
    • Subtraction (-)
    • Multiplication (*)
    • Division (/)
    • Exponentiation (^)
    • Unary minus (-)
  • Created five Resolvers, each one with different pros and cons:
    • DefaultVarResolver
    • IndexedVarResolver
    • SmallVarResolver
    • ConstantResolver
    • EmptyResolver
  • Feature flag bench-internal for running internal benchmarks.