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package gojq_test
import (
"encoding/json"
"fmt"
"log"
"math/big"
"strconv"
"github.com/wader/gojq"
)
func toFloat(x any) (float64, bool) {
switch x := x.(type) {
case int:
return float64(x), true
case float64:
return x, true
case *big.Int:
f, err := strconv.ParseFloat(x.String(), 64)
return f, err == nil
default:
return 0.0, false
}
}
func ExampleWithFunction() {
query, err := gojq.Parse(".[] | f | f(3)")
if err != nil {
log.Fatalln(err)
}
code, err := gojq.Compile(
query,
gojq.WithFunction("f", 0, 1, func(x any, xs []any) any {
if x, ok := toFloat(x); ok {
if len(xs) == 1 {
if y, ok := toFloat(xs[0]); ok {
x *= y
} else {
return fmt.Errorf("f cannot be applied to: %v, %v", x, xs)
}
} else {
x += 2
}
return x
}
return fmt.Errorf("f cannot be applied to: %v, %v", x, xs)
}),
)
if err != nil {
log.Fatalln(err)
}
input := []any{0, 1, 2.5, json.Number("10000000000000000000000000000000000000000")}
iter := code.Run(input)
for {
v, ok := iter.Next()
if !ok {
break
}
if err, ok := v.(error); ok {
log.Fatalln(err)
}
fmt.Printf("%#v\n", v)
}
// Output:
// 6
// 9
// 13.5
// 3e+40
}
|
