File: option_function_test.go

package info (click to toggle)
golang-github-wader-gojq 0.0~git20231105.2b6d9e2-1
  • links: PTS, VCS
  • area: main
  • in suites: sid, trixie
  • size: 960 kB
  • sloc: yacc: 642; makefile: 84
file content (71 lines) | stat: -rw-r--r-- 1,216 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
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
}