https://github.com/aiekick/ezexpr

Easy to use and flexible math expression parser / evaluator in a one file header only
https://github.com/aiekick/ezexpr

cpp11 custom-functions easy expression-evaluator expression-parser math modern powerfull

Last synced: 3 days ago
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Easy to use and flexible math expression parser / evaluator in a one file header only

• Host: GitHub
• URL: https://github.com/aiekick/ezexpr
• Owner: aiekick
• License: mit
• Created: 2024-08-08T14:55:05.000Z (about 2 months ago)
• Default Branch: master
• Last Pushed: 2024-08-30T00:09:13.000Z (29 days ago)
• Last Synced: 2024-09-24T20:56:12.682Z (3 days ago)
• Topics: cpp11, custom-functions, easy, expression-evaluator, expression-parser, math, modern, powerfull
• Language: C++
• Homepage:
• Size: 1.87 MB
• Stars: 5
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# EzExpr

EzExpr is a easy to use and flexible expression parser / evaluator 

in a one file header only style for cpp11 at least

# Quick Start

```cpp

ez::Expr ev;

auto result0 = ev.parse("x + 2.5 * d").set("x", 0.5).set("d", 1.5).eval().getResult();

auto result1 = ev.set("x", 10.5).eval().getResult();

auto result2 = ev.set("d", 2.5).eval().getResult();

```

```cpp

ez::Expr ev;

ev.addFunction("fma", [](double a, double b, double c) { return a*b+c; }); // ternary function

auto result0 = ev.parse("floor(fma(x,y,k))").set("x", 0.5).set("y", 1.5).set("k", 3.2).eval().getResult();

```

# Features

* Modern use

* One header file only

* Parsing and evaluation on separated calls

* User can easily add their custom Unary/Binary/Ternary Function

* Cpp11 compatible at least

* Can identify and return to user the variables

* Many exceptions are emited for many not conformant issue during parsing and during evaluation

* Use their own String class for faster response

* all numbers and computation are in double precision

# Builtins

```cpp

+ - * / ^ % 

! (factorielle : N!)

```

## Constants

* pi

* e

## Unary function

* abs, floor, ceil, round, fract, sign

* sin, cos, tan

* asin, acos, atan

* sinh, cosh, tanh

* asinh, acosh, atanh

* ln, log, log1p, logb, log2, log10

* exp

* sqrt

## Binary function

* mod, atan2, min, max, step, hypot, smoothabs

## Ternary function

* clamp, mis, smoothstep (glsl functions)

* saturate, lerp (hlsl functions)