kovtunv/nostringevaluating

Fast low memory consuming mathematical evaluation without endless string parsing! Parses string formula once and uses its object sequence in each evaluation. Moreover, provides user defined functions and variables.

nostringevaluating's Issues

Some hints to improve the quality of the benchmark

Hi,

Many thanks for the lib and the benchmark. mXparser does not fight strictly for the performance - the main focus is the functionality. Anyway it is a great comparison. Before running the benchmark always turn off all the smart rounding settings - especially the canonical option is very heavy.

Please see more here: https://mathparser.org/mxparser-tutorial/smart-rounding-settings/
And here: https://mathparser.org/mxparser-tutorial/efficient-calculations-in-loops/
And here: https://mathparser.org/mxparser-tutorial/expression-pre-compilation/

Best regards :-)

Stack overflow during dispose

Hi again!

I've been using the library for a while now but I've noticed that during shutdown, when disposing my IOC container, the library throws a stack overflow exception.

I implemented the Ninject module pretty much exactly as in the example you provided: https://github.com/Artemis-RGB/Artemis/blob/VisualScripting/src/Artemis.VisualScripting/Ninject/NoStringNinjectModule.cs

I'm not sure what kind of other useful information I can provide you with but hopefully this can be fixed, if you need anything let me know! :)

DateTime Functions

Hi,
Are DateTime Functions working?
DateDif(date1; date2; 'Y')?

If yes, Can give me an example

Null value and other improvements

• null value and variable
• options with behavior if there isn't a variable (throw exception or return null)
• Implement functions IfNull and NullIf
  IfNull(x,3) => Returns 3 if x is Null
  NullIf(x,3) => Returns Null if x == 3
• Boolean type
• Improve unit tests
• Object type
• Evaluator interface with a nullable result
• Change function registration approach
• Evaluator builder with the least memory consumption
• Update readme

How to calculate an expression for each row of a large data table without affecting performance

I want to calculate an expression for each row of a data table and add a new column to the data table based on the result got.

Evaluator.Parse() throws unexpected exceptions

Evaluator.Parse() throws unexpected exceptions on malformed input.

Example 1:

var facade = NoStringEvaluator.CreateFacade();
var evaluator = facade.Evaluator;
evaluator.Calc("0(!(");

System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index')
at System.Collections.Generic.List1.get_Item(Int32 index) at NoStringEvaluating.Functions.Logic.NotAliasFunction.Execute(List1 args, ValueFactory factory)
at NoStringEvaluating.NoStringEvaluator.CalcFunction(FunctionWrapperNode functionWrapper, VariablesSource variables, ValueKeeperContainer valueKeeperContainer)
at NoStringEvaluating.NoStringEvaluator.CalcInternal(List1 nodes, VariablesSource variables, ValueKeeperContainer valueKeeperContainer) at NoStringEvaluating.NoStringEvaluator.OnCalcAggregated(List1 nodes, VariablesSource variables)
at NoStringEvaluating.NoStringEvaluator.Calc(String formula)

Example 2:
evaluator.Calc("(");

System.InvalidOperationException: Stack empty.
at System.Collections.Generic.Stack1.ThrowForEmptyStack() at System.Collections.Generic.Stack1.Pop()
at NoStringEvaluating.NoStringEvaluator.CalcInternal(List1 nodes, VariablesSource variables, ValueKeeperContainer valueKeeperContainer) at NoStringEvaluating.NoStringEvaluator.OnCalcAggregated(List1 nodes, VariablesSource variables)
at NoStringEvaluating.NoStringEvaluator.Calc(String formula)

How to implement String.Format() Functionality

String.Format() manages formatting including the position, alignment, and format type

Use without extra dependencies

Hello,

I'd love to use this library in a dekstop application but I'd really rather stay away from a dependency on Microsoft.Extensions.DependencyInjection and friends.

Is it possible to use this without adding that dependency? I'm using Ninject.

Thanks in advance!