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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package quick
import (
"bufio"
"bytes"
"fmt"
"io"
"gopkg.in/cheggaaa/pb.v1"
)
const errorFmt = "%5d: %s <<<<"
// FormatJSONSyntaxError generates a pretty printed json syntax error since
// golang doesn't provide an easy way to report the location of the error
func FormatJSONSyntaxError(data io.Reader, offset int64) (highlight string) {
var readLine bytes.Buffer
errLine := 1
var readBytes int64
bio := bufio.NewReader(data)
// termWidth is set to a default one to use when we are
// not able to calculate terminal width via OS syscalls
termWidth := 25
// errorShift is the length of the minimum needed place for
// error msg accessories, like <--, etc.. We calculate it
// dynamically to avoid an eventual bug after modifying errorFmt
errorShift := len(fmt.Sprintf(errorFmt, 1, ""))
if width, err := pb.GetTerminalWidth(); err == nil {
termWidth = width
}
for {
b, err := bio.ReadByte()
if err != nil {
break
}
readBytes++
if readBytes > offset {
break
}
if b == '\n' {
readLine.Reset()
errLine++
continue
} else if b == '\t' {
readLine.WriteByte(' ')
} else if b == '\r' {
break
}
readLine.WriteByte(b)
}
lineLen := readLine.Len()
idx := lineLen - termWidth + errorShift
if idx < 0 || idx > lineLen-1 {
idx = 0
}
return fmt.Sprintf(errorFmt, errLine, readLine.String()[idx:])
}
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