expression 1.0.0
Simple expression evaluator
To use this package, run the following command in your project's root directory:
Manual usage
Put the following dependency into your project's dependences section:
Simple expression evaluator
Supports +, -, *, /, (), variables and functions.
import std.stdio;
import std.math;
import expression;
void main() {
import std.stdio;
auto expr = compileExpression("base + delta/(0.5 * begin - end) + sqrt(min(base / 10, delta))");
static assert(is(typeof(expr) == Expression!float));
// set variables and functions as properties
expr.base = 1001.3;
expr.delta = 535.4;
expr.min = (float x, float y) => x < y ? x : y;
// or as indexes
expr["begin"] = 34;
expr["end"] = 12;
expr["sqrt"] = (float x) => sqrt(x);
// evaluate
writeln("result: ", expr()); // 1118.39
// functions with different arities may have the same name.
expr = compileExpression("dist(x, y) + dist(x)");
expr.dist = (float x, float y) => sqrt(x*x + y*y);
expr.dist = (float x) => sqrt((x + 2) * (x + 2) + (x + 9) * (x + 9));
expr.x = 3;
expr.y = 4;
writeln("result: ", expr()); // 18
}
- 1.0.0 released 4 years ago
- japplegame/expression
- MIT
- Copyright © 2020, Jack Applegame
- Authors:
- Dependencies:
- none
- Versions:
-
1.0.2 2021-Oct-21 1.0.1 2020-Oct-31 1.0.0 2020-May-14 ~master 2021-Oct-21 - Download Stats:
-
-
0 downloads today
-
0 downloads this week
-
0 downloads this month
-
107 downloads total
-
- Score:
- 0.8
- Short URL:
- expression.dub.pm