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func.go
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51 lines (45 loc) · 1.17 KB
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package gisk
import (
"errors"
"fmt"
"github.com/gogf/gf/v2/util/gconv"
"math/rand"
"sync"
"time"
)
type Func func(parameters ...Value) (Value, error)
var funcMap sync.Map
func RegisterFunc(name string, function Func) {
funcMap.Store(name, function)
}
func getFunc(name string) (Func, bool) {
function, ok := funcMap.Load(name)
if !ok {
return nil, false
}
return function.(Func), true
}
func init() {
//注册随机函数
RegisterFunc("rand", func(parameters ...Value) (Value, error) {
if len(parameters) < 2 {
return Value{}, errors.New("rand function need two parameters")
}
n1 := gconv.Int(parameters[0].Value)
n2 := gconv.Int(parameters[1].Value)
if n1 >= n2 || n1 < 0 {
return Value{}, fmt.Errorf("rand函数参数错误，参数2应该大于参数1[%d,%d]", n1, n2)
}
rng := rand.New(rand.NewSource(time.Now().UnixNano()))
res := rng.Intn(n2-n1+1) + n1
return Value{ValueType: NUMBER, Value: res}, nil
})
//注册求和函数
RegisterFunc("sum", func(parameters ...Value) (Value, error) {
var v float64
for _, parameter := range parameters {
v += gconv.Float64(parameter.Value)
}
return Value{ValueType: NUMBER, Value: v}, nil
})
}