Rabbit

数学公式解析器

一：功能介绍

1.示例：

• 数学公式：f(x)=4^x+5
• 使用：

var domain = new RabbitDomain();
var expression = domain.CompileFromSource("f(x)=4^x+5");
var result = expression.Eval(new RuntimeContext()
{
	["x"] = 2,
});

//result: 21

2.内置数学函数:

• abs
• ceiling
• floor
• exp
• sin
• ....

3.内置逻辑函数

• if

var domain = new RabbitDomain();
var expression = domain.CompileFromSource("f(x)=if(x>0,10/x,0)");
var result = expression.Eval(new RuntimeContext()
{
	["x"] = 2,
});

//result: 5

4.自定义公式调用:

var domain = new RabbitDomain();
domain.CompileFromSource("exp(lv)=lv*10");
var expression = domain.CompileFromSource("maxhp(lv)=exp(lv)+100");
var result = expression.Eval(new RuntimeContext()
{
	["lv"] = 4,
});

//result: 140

5.域隔离:

var domain1 = new RabbitDomain();
domain1.CompileFromSource("vf(x)=x+1");
var expr1 = domain1.CompileFromSource("exp(lv)=vf(lv)*10");

var domain2 = new RabbitDomain();
domain2.CompileFromSource("vf(x)=x+2");
var expr2 = domain2.CompileFromSource("exp(lv)=vf(lv)*10");

var result1 = expr1.Eval(new RuntimeContext()
{
	["lv"] = 4,
});
var result2 = expr2.Eval(new RuntimeContext()
{
	["lv"] = 4,
});

//result1: 50
//result2: 60

6.编译成指定委托:

var formula = "f(days,per)=max(0.1,1.0/(2^floor(days/10)))";
var expression = Rabbit.CompileFromSource(formula);
var factory = expression.Compile<Func<decimal, decimal, decimal>>();
var result = factory(44, 2);

//result: 0.1