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97 lines
2.2 KiB
97 lines
2.2 KiB
9 years ago
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/*
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* Quick - Quick key value store for config files and persistent state files
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*
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* Minio Client (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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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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"encoding/json"
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"errors"
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"fmt"
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"io"
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"github.com/olekukonko/ts"
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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, sErr *json.SyntaxError) error {
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if sErr == nil {
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return nil
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}
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var readLine bytes.Buffer
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bio := bufio.NewReader(data)
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errLine := int64(1)
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readBytes := int64(0)
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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 accessoires, 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 termSize, err := ts.GetSize(); err == nil {
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termWidth = termSize.Col()
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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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if err != io.EOF {
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return err
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}
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break
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}
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readBytes++
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if readBytes > sErr.Offset {
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break
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}
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switch b {
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case '\n':
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readLine.Reset()
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errLine++
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case '\t':
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readLine.WriteByte(' ')
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case '\r':
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break
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default:
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readLine.WriteByte(b)
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}
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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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errorStr := fmt.Sprintf("JSON syntax error at line %d, col %d : %s.\n",
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errLine, readLine.Len(), sErr)
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errorStr += fmt.Sprintf(errorFmt, errLine, readLine.String()[idx:])
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return errors.New(errorStr)
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}
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