Custom Functions

• Define custom functions and redefine built-in functions when parsing
  an expression. See docs and example.
• Use MathNodeExpression.getPotentialFunctionNames() to detect potentially
  used functions in a string.
• Use period in the middle of custom variable and function names.
• Under-hood, functions now support multiple comma separated arguments, so
  you can supply multiple arguments to your custom function.
• Detect custom functions im math tree using
  MathExpression.getUsedFreeformFunctions().

Breaking changes

• MissingFunctionArgumentListException renamed to
  OutOfRangeFunctionArgumentListException
• MathNodeExpression.fromString() may throw other errors besides
  MathException
• MathNodeExpression.getPotentialVariableNames() is replaced by
  MathNodeExpression.getPotentialDefinable()
• Instead of log[base](arg), you should pass log(base, arg) syntax now
• Period is an allowed character in the middle of a variable name now

Misc.

• UnexpectedClosingBracketException and BracketsNotClosedException can
  now tell where the problem probably happened.
• New MathParseException's InvalidFunctionNameException,
  DuplicateDeclarationException, InvalidFunctionArgumentsDeclaration.

1.3.1

• Variable validation fix

1.3.0

Math Tree

• Important change: MathNode is now a class of MathExpression interface.
  Compared to MathNode, MathExpression may return null in calc() method.
• New: getUsedVariables() method for MathExpression and MathNode.
  This method goes down the math tree to find any uses of MathVariable
  and returns names of all variables.
• New: MathExpression object family - MathComparison:
  • MathComparisonEquation (=)
  • MathComparisonGreater (>)
  • MathComparisonLess (<)

Parsing

• New: MathNodeExpression.fromStringExtended() method allows you to
  interpret equations and comparisons. Compared to fromString,
  it returns MathExpression instead of MathNode, since comparisons
  can't guarantee result.
• New: MathNodeExpression.getPotentialVariableNames() analyzes given
  math expression string for possible use of variables. Refer to
  documentation for rough edges before using it.
• New: MathNodeExpression.builtInVariables gives a list of built-in
  predefined variable names.
• New: MathNodeExpression.isVariableNameValid() lets you check if
  the parser can work with a given name.

Misc.

• Changed input parameters type for CantProcessExpressionException.
• Small documentation fixes.

• Custom variables support.
• MathFunctionXdeprecated.
• MathVariable introduced.
• You need to pass an instance of MathVariableValues instead of a num to the calc() function now
• Fix README
• Moved integrating features to a separate package library math_parser_integrate

• Custom variables support.
• MathFunctionXdeprecated.
• MathVariable introduced.
• You need to pass an instance of MathVariableValues instead of a num to the calc() function now.

• Initial release.