function_tree 0.9.0

A simple library for parsing strings into callable function-trees.

Change log

0.9.0

• Incorporated Dart 3 features.
• More resilient to repeated negation / confirmation.
• Added a representation method on trees to show structure.
• Added a toString representation of nodes and function trees.
• Cleaned up the code base to be easier to read and to better match the dart.dev recommendations.
• Interpreter shakes out some unnecessary components, such as parentheses surrounding constants, while generating tree.

0.8.13

• Allow unary + or - to directly follow the *, /, ^ or % operators.

0.8.12

• Parse numbers as doubles instead of nums to prevents common use case issues with large integers.

0.8.11

• Oh dear! This time with debug mode off!

0.8.1

• Fixed unary sign bug that treated expressions like -a+b as -(a+b). Wow!

0.8.0-dev.1

• Added null safety!
• String interpolation appears even slower than before, but the generated function trees are still pretty efficient (once generated, within an order of magnitude of native Dart math library functions).

0.7.0

• Added functionality for two-parameter functions, log, nrt and pow in response to a feature request.

0.6.0

• Important bug fix: differences

0.5.0

• Dusted out some cobwebs.
• Renamed FunctionTree MultiVariableFunction and FunctionOfX SingleVariableFunction, which is more expressive.
• Removed zero, derivative and integral estimates, which I feel were tangential.

0.2.6

Fixed ambiguity issue: if the user chooses a variable name in an expression that happens to be a special constant name (such as 'e'), the parser will take occurrences in the expression to mean that the variable.

0.2.5

• Marked as ready for Dart 2.
• dartfmt-ed some of the files.
• Added support for the % operator.
• Added support for floor, ceil and round.
• Added come timing comparisons between evaluating native Dart functions, function tree instances and repeated string parsing in test/.

0.2.0

• Re-wrote the parsing engine: code much cleaner and easier to read.
• Cleared out deprecated dart:math constants.
• Updated code for Dart 2.
• Added support for abs.

0.1.1

• Basic numerical differentiation.
• Basic numerical integration (Simpson).
• Basic zero-finding (Newton).
• Very much proof of concept.

0.1.0

• Initial version, proof of concept.
• Very little checking of input at this stage.