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// Package jq facilitates processing of JSON strings using jq expressions.
package jq
import (
"bytes"
"encoding/json"
"fmt"
"io"
"math"
"os"
"strconv"
"github.com/cli/go-gh/v2/pkg/jsonpretty"
"github.com/itchyny/gojq"
)
// Evaluate a jq expression against an input and write it to an output.
// Any top-level scalar values produced by the jq expression are written out
// directly, as raw values and not as JSON scalars, similar to how jq --raw
// works.
func Evaluate(input io.Reader, output io.Writer, expr string) error {
return EvaluateFormatted(input, output, expr, "", false)
}
// Evaluate a jq expression against an input and write it to an output,
// optionally with indentation and colorization. Any top-level scalar values
// produced by the jq expression are written out directly, as raw values and not
// as JSON scalars, similar to how jq --raw works.
func EvaluateFormatted(input io.Reader, output io.Writer, expr string, indent string, colorize bool) error {
query, err := gojq.Parse(expr)
if err != nil {
return err
}
code, err := gojq.Compile(
query,
gojq.WithEnvironLoader(func() []string {
return os.Environ()
}))
if err != nil {
return err
}
jsonData, err := io.ReadAll(input)
if err != nil {
return err
}
var responseData interface{}
err = json.Unmarshal(jsonData, &responseData)
if err != nil {
return err
}
enc := prettyEncoder{
w: output,
indent: indent,
colorize: colorize,
}
iter := code.Run(responseData)
for {
v, ok := iter.Next()
if !ok {
break
}
if err, isErr := v.(error); isErr {
return err
}
if text, e := jsonScalarToString(v); e == nil {
_, err := fmt.Fprintln(output, text)
if err != nil {
return err
}
} else {
if err = enc.Encode(v); err != nil {
return err
}
}
}
return nil
}
func jsonScalarToString(input interface{}) (string, error) {
switch tt := input.(type) {
case string:
return tt, nil
case float64:
if math.Trunc(tt) == tt {
return strconv.FormatFloat(tt, 'f', 0, 64), nil
} else {
return strconv.FormatFloat(tt, 'f', 2, 64), nil
}
case nil:
return "", nil
case bool:
return fmt.Sprintf("%v", tt), nil
default:
return "", fmt.Errorf("cannot convert type to string: %v", tt)
}
}
type prettyEncoder struct {
w io.Writer
indent string
colorize bool
}
func (p prettyEncoder) Encode(v any) error {
var b []byte
var err error
if p.indent == "" {
b, err = json.Marshal(v)
} else {
b, err = json.MarshalIndent(v, "", p.indent)
}
if err != nil {
return err
}
if !p.colorize {
if _, err := p.w.Write(b); err != nil {
return err
}
if _, err := p.w.Write([]byte{'\n'}); err != nil {
return err
}
return nil
}
return jsonpretty.Format(p.w, bytes.NewReader(b), p.indent, true)
}
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