gitlab.com/aquachain/aquachain@v1.17.16-rc3.0.20221018032414-e3ddf1e1c055/common/test_utils.go (about) 1 // Copyright 2018 The aquachain Authors 2 // This file is part of the aquachain library. 3 // 4 // The aquachain 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. 8 // 9 // The aquachain 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. 13 // 14 // You should have received a copy of the GNU Lesser General Public License 15 // along with the aquachain library. If not, see <http://www.gnu.org/licenses/>. 16 17 package common 18 19 import ( 20 "encoding/json" 21 "fmt" 22 "io/ioutil" 23 ) 24 25 // LoadJSON reads the given file and unmarshals its content. 26 func LoadJSON(file string, val interface{}) error { 27 content, err := ioutil.ReadFile(file) 28 if err != nil { 29 return err 30 } 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) 35 } 36 return fmt.Errorf("JSON unmarshal error in %v: %v", file, err) 37 } 38 return nil 39 } 40 41 // findLine returns the line number for the given offset into data. 42 func findLine(data []byte, offset int64) (line int) { 43 line = 1 44 for i, r := range string(data) { 45 if int64(i) >= offset { 46 return 47 } 48 if r == '\n' { 49 line++ 50 } 51 } 52 return 53 }