54 lines
1.6 KiB
Go
54 lines
1.6 KiB
Go
// Copyright 2015 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package common
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"io/ioutil"
|
|
)
|
|
|
|
// LoadJSON reads the given file and unmarshals its content.
|
|
func LoadJSON(file string, val interface{}) error {
|
|
content, err := ioutil.ReadFile(file)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := json.Unmarshal(content, val); err != nil {
|
|
if syntaxerr, ok := err.(*json.SyntaxError); ok {
|
|
line := findLine(content, syntaxerr.Offset)
|
|
return fmt.Errorf("JSON syntax error at %v:%v: %v", file, line, err)
|
|
}
|
|
return fmt.Errorf("JSON unmarshal error in %v: %v", file, err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// findLine returns the line number for the given offset into data.
|
|
func findLine(data []byte, offset int64) (line int) {
|
|
line = 1
|
|
for i, r := range string(data) {
|
|
if int64(i) >= offset {
|
|
return
|
|
}
|
|
if r == '\n' {
|
|
line++
|
|
}
|
|
}
|
|
return
|
|
}
|