github.com/sberex/go-sberex@v1.8.2-0.20181113200658-ed96ac38f7d7/common/test_utils.go (about)

     1  // This file is part of the go-sberex library. The go-sberex library is 
     2  // free software: you can redistribute it and/or modify it under the terms 
     3  // of the GNU Lesser General Public License as published by the Free 
     4  // Software Foundation, either version 3 of the License, or (at your option)
     5  // any later version.
     6  //
     7  // The go-sberex library is distributed in the hope that it will be useful, 
     8  // but WITHOUT ANY WARRANTY; without even the implied warranty of
     9  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser 
    10  // General Public License <http://www.gnu.org/licenses/> for more details.
    11  
    12  package common
    13  
    14  import (
    15  	"encoding/json"
    16  	"fmt"
    17  	"io/ioutil"
    18  )
    19  
    20  // LoadJSON reads the given file and unmarshals its content.
    21  func LoadJSON(file string, val interface{}) error {
    22  	content, err := ioutil.ReadFile(file)
    23  	if err != nil {
    24  		return err
    25  	}
    26  	if err := json.Unmarshal(content, val); err != nil {
    27  		if syntaxerr, ok := err.(*json.SyntaxError); ok {
    28  			line := findLine(content, syntaxerr.Offset)
    29  			return fmt.Errorf("JSON syntax error at %v:%v: %v", file, line, err)
    30  		}
    31  		return fmt.Errorf("JSON unmarshal error in %v: %v", file, err)
    32  	}
    33  	return nil
    34  }
    35  
    36  // findLine returns the line number for the given offset into data.
    37  func findLine(data []byte, offset int64) (line int) {
    38  	line = 1
    39  	for i, r := range string(data) {
    40  		if int64(i) >= offset {
    41  			return
    42  		}
    43  		if r == '\n' {
    44  			line++
    45  		}
    46  	}
    47  	return
    48  }