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82 lines
2.1 KiB
Go
82 lines
2.1 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package quick
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"github.com/cheggaaa/pb"
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)
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const errorFmt = "%5d: %s <<<<"
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// FormatJSONSyntaxError generates a pretty printed json syntax error since
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// golang doesn't provide an easy way to report the location of the error
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func FormatJSONSyntaxError(data io.Reader, offset int64) (highlight string) {
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var readLine bytes.Buffer
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var errLine = 1
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var readBytes int64
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bio := bufio.NewReader(data)
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// termWidth is set to a default one to use when we are
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// not able to calculate terminal width via OS syscalls
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termWidth := 25
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// errorShift is the length of the minimum needed place for
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// error msg accessories, like <--, etc.. We calculate it
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// dynamically to avoid an eventual bug after modifying errorFmt
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errorShift := len(fmt.Sprintf(errorFmt, 1, ""))
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if width, err := pb.GetTerminalWidth(); err == nil {
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termWidth = width
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}
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for {
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b, err := bio.ReadByte()
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if err != nil {
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break
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}
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readBytes++
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if readBytes > offset {
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break
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}
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if b == '\n' {
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readLine.Reset()
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errLine++
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continue
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} else if b == '\t' {
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readLine.WriteByte(' ')
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} else if b == '\r' {
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break
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}
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readLine.WriteByte(b)
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}
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lineLen := readLine.Len()
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idx := lineLen - termWidth + errorShift
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if idx < 0 || idx > lineLen-1 {
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idx = 0
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}
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return fmt.Sprintf(errorFmt, errLine, readLine.String()[idx:])
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}
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