1 // Copyright 2015 The go-ethereum Authors
2 // This file is part of the go-ethereum library.
4 // The go-ethereum library is free software: you can redistribute it and/or modify
5 // it under the terms of the GNU Lesser General Public License as published by
6 // the Free Software Foundation, either version 3 of the License, or
7 // (at your option) any later version.
9 // The go-ethereum library is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU Lesser General Public License for more details.
14 // You should have received a copy of the GNU Lesser General Public License
15 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
25 // LoadJSON reads the given file and unmarshals its content.
26 func LoadJSON(file string, val interface{}) error {
27 content, err := ioutil.ReadFile(file)
31 if err := json.Unmarshal(content, val); err != nil {
32 if syntaxerr, ok := err.(*json.SyntaxError); ok {
33 line := findLine(content, syntaxerr.Offset)
34 return fmt.Errorf("JSON syntax error at %v:%v: %v", file, line, err)
36 return fmt.Errorf("JSON unmarshal error in %v: %v", file, err)
41 // findLine returns the line number for the given offset into data.
42 func findLine(data []byte, offset int64) (line int) {
44 for i, r := range string(data) {
45 if int64(i) >= offset {