functionx 1.2.0

A powerful equation parser and solver for Dart. Parse expressions, extract variables, evaluate, solve equations, and perform symbolic calculus with a comprehensive physics constants library.

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.

1.2.0 - 2025-12-25

Changed

• BREAKING: Removed all implicit multiplication support. The parser now requires explicit operators (e.g., m*a instead of ma).
• BREAKING: Strict constant lookup. Constants must be referenced by their explicit keys (e.g., SOL, GC, SG) to be automatically prefilled. Ambiguous symbols like c, g, h are now treated strictly as variables.
• Refactored PhysicsConstant to NaturalConstant to better reflect the domain-agnostic nature of the constants.
• Removed "repair phase" and implicit cleaning logic from variable extraction to ensure 100% predictable parsing.

Fixed

• Fixed issue where variable aliases (e.g., g vs SG) caused duplicate rows in the solver UI.
• Fixed getPrefilledValues heuristics to be deterministic and strict.

1.1.0 - 2025-12-25

Added

• Enhanced Greek Letter Support: Improved parsing of LaTeX Greek commands (e.g., \alpha, \Phi_0, \Delta E)
• Automatic Physics Constants: Solver now automatically identifies and substitutes physics constants mentioned by their symbols or keys
• Subscript Support: Improved handling of variable subscripts in both plain text (x_1) and LaTeX (x_{1})

Changed

• Improved numerical solver's accuracy for high-sensitivity physics equations (like Rydberg formula)
• Unified math symbol rendering (π, ∞, etc.) to use standard LaTeX commands consistently
• Refined variable extraction to correctly exclude math and physics constants from "unknowns"

Fixed

• Resolved NaN results in complex arithmetic involving the imaginary unit i
• Improved convergence of Newton's method with expanded search ranges and better starting points

1.0.0 - 2024-12-24

Added

• ExpressionParser - New clean API for parsing expressions and extracting variables
• Evaluator - New class for expression evaluation with variable substitution
• Solver - New equation solver with algebraic and numerical methods
• Cas - Computer Algebra System for differentiation and integration
• ExpressionGrammar - PetitParser grammar for explicit algebraic notation
• Comprehensive documentation and examples

Changed

• BREAKING: Complete API reorganization with cleaner, more intuitive classes
• Moved to explicit operator notation (e.g., 2*x instead of 2x)
• Improved error handling with descriptive error messages

Deprecated

• MathEquationParser - Use ExpressionParser + Evaluator instead
• AlgebraicEquationParser - Use Solver instead
• CasParser - Use Cas instead

Fixed

• Single-letter variables no longer incorrectly match physics constants
• Better handling of mathematical constants (pi, e, infinity)