go-pkg/expr
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builtin-base.go: string() function added

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This commit is contained in:
Celestino Amoroso 2024-06-26 04:27:14 +02:00
parent f1e2163277
commit 522b5983bd
1 changed files with 28 additions and 0 deletions
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28
builtin-base.go
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@ -5,6 +5,7 @@
package expr
import (
"fmt"
"math"
"strconv"
)
@ -120,6 +121,32 @@ func decFunc(ctx ExprContext, name string, args []any) (result any, err error) {
return
}
func stringFunc(ctx ExprContext, name string, args []any) (result any, err error) {
switch v := args[0].(type) {
case int64:
result = strconv.FormatInt(v, 10)
case float64:
result = strconv.FormatFloat(v, 'g', -1, 64)
case bool:
if v {
result = "true"
} else {
result = "false"
}
case string:
result = v
case *FractionType:
result = v.ToString(0)
case Formatter:
result = v.ToString(0)
case fmt.Stringer:
result = v.String()
default:
err = ErrCantConvert(name, v, "string")
}
return
}
func fractFunc(ctx ExprContext, name string, args []any) (result any, err error) {
switch v := args[0].(type) {
case int64:
@ -175,6 +202,7 @@ func ImportBuiltinsFuncs(ctx ExprContext) {
ctx.RegisterFunc("bool", NewGolangFunctor(boolFunc), TypeBoolean, anyParams)
ctx.RegisterFunc("int", NewGolangFunctor(intFunc), TypeInt, anyParams)
ctx.RegisterFunc("dec", NewGolangFunctor(decFunc), TypeFloat, anyParams)
ctx.RegisterFunc("string", NewGolangFunctor(stringFunc), TypeString, anyParams)
ctx.RegisterFunc("fract", NewGolangFunctor(fractFunc), TypeFraction, []ExprFuncParam{
NewFuncParam(ParamValue),
NewFuncParamFlagDef("denominator", PfDefault, 1),