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package stdlib
import (
"math/rand"
"github.com/d5/tengo/objects"
)
var randModule = map[string]objects.Object{
"int": &objects.UserFunction{Name: "int", Value: FuncARI64(rand.Int63)},
"float": &objects.UserFunction{Name: "float", Value: FuncARF(rand.Float64)},
"intn": &objects.UserFunction{Name: "intn", Value: FuncAI64RI64(rand.Int63n)},
"exp_float": &objects.UserFunction{Name: "exp_float", Value: FuncARF(rand.ExpFloat64)},
"norm_float": &objects.UserFunction{Name: "norm_float", Value: FuncARF(rand.NormFloat64)},
"perm": &objects.UserFunction{Name: "perm", Value: FuncAIRIs(rand.Perm)},
"seed": &objects.UserFunction{Name: "seed", Value: FuncAI64R(rand.Seed)},
"read": &objects.UserFunction{
Value: func(args ...objects.Object) (ret objects.Object, err error) {
if len(args) != 1 {
return nil, objects.ErrWrongNumArguments
}
y1, ok := args[0].(*objects.Bytes)
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "first",
Expected: "bytes",
Found: args[0].TypeName(),
}
}
res, err := rand.Read(y1.Value)
if err != nil {
ret = wrapError(err)
return
}
return &objects.Int{Value: int64(res)}, nil
},
},
"rand": &objects.UserFunction{
Value: func(args ...objects.Object) (ret objects.Object, err error) {
if len(args) != 1 {
return nil, objects.ErrWrongNumArguments
}
i1, ok := objects.ToInt64(args[0])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "first",
Expected: "int(compatible)",
Found: args[0].TypeName(),
}
}
src := rand.NewSource(i1)
return randRand(rand.New(src)), nil
},
},
}
func randRand(r *rand.Rand) *objects.ImmutableMap {
return &objects.ImmutableMap{
Value: map[string]objects.Object{
"int": &objects.UserFunction{Name: "int", Value: FuncARI64(r.Int63)},
"float": &objects.UserFunction{Name: "float", Value: FuncARF(r.Float64)},
"intn": &objects.UserFunction{Name: "intn", Value: FuncAI64RI64(r.Int63n)},
"exp_float": &objects.UserFunction{Name: "exp_float", Value: FuncARF(r.ExpFloat64)},
"norm_float": &objects.UserFunction{Name: "norm_float", Value: FuncARF(r.NormFloat64)},
"perm": &objects.UserFunction{Name: "perm", Value: FuncAIRIs(r.Perm)},
"seed": &objects.UserFunction{Name: "seed", Value: FuncAI64R(r.Seed)},
"read": &objects.UserFunction{
Value: func(args ...objects.Object) (ret objects.Object, err error) {
if len(args) != 1 {
return nil, objects.ErrWrongNumArguments
}
y1, ok := args[0].(*objects.Bytes)
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "first",
Expected: "bytes",
Found: args[0].TypeName(),
}
}
res, err := r.Read(y1.Value)
if err != nil {
ret = wrapError(err)
return
}
return &objects.Int{Value: int64(res)}, nil
},
},
},
}
}
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