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// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.
package jsonutils
import (
"bytes"
"encoding/json"
"github.com/pkg/errors"
)
type HumanizedJSONError struct {
Err error
Line int
Character int
}
func (e *HumanizedJSONError) Error() string {
return e.Err.Error()
}
// HumanizeJSONError extracts error offsets and annotates the error with useful context
func HumanizeJSONError(err error, data []byte) error {
if syntaxError, ok := err.(*json.SyntaxError); ok {
return NewHumanizedJSONError(syntaxError, data, syntaxError.Offset)
} else if unmarshalError, ok := err.(*json.UnmarshalTypeError); ok {
return NewHumanizedJSONError(unmarshalError, data, unmarshalError.Offset)
} else {
return err
}
}
func NewHumanizedJSONError(err error, data []byte, offset int64) *HumanizedJSONError {
if err == nil {
return nil
}
if offset < 0 || offset > int64(len(data)) {
return &HumanizedJSONError{
Err: errors.Wrapf(err, "invalid offset %d", offset),
}
}
lineSep := []byte{'\n'}
line := bytes.Count(data[:offset], lineSep) + 1
lastLineOffset := bytes.LastIndex(data[:offset], lineSep)
character := int(offset) - (lastLineOffset + 1) + 1
return &HumanizedJSONError{
Line: line,
Character: character,
Err: errors.Wrapf(err, "parsing error at line %d, character %d", line, character),
}
}
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