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https://github.com/gohugoio/hugo.git
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f669ef6bec
`*json.UnmarshalTypeError` and `*json.SyntaxError` has a byte `Offset`, so use that. This commit also reworks/simplifies the errror line matching logic. This also makes the file reading unbuffered, but that should be fine in this error case. See #5324
145 lines
3.4 KiB
Go
145 lines
3.4 KiB
Go
// Copyright 2018 The Hugo Authors. All rights reserved.
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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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// 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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// limitatio ns under the License.
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package herrors
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import (
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"encoding/json"
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"github.com/pkg/errors"
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)
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var _ causer = (*fileError)(nil)
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// FileError represents an error when handling a file: Parsing a config file,
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// execute a template etc.
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type FileError interface {
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error
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// Offset gets the error location offset in bytes, starting at 0.
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// It will return -1 if not provided.
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Offset() int
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// LineNumber gets the error location, starting at line 1.
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LineNumber() int
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// Column number gets the column location, starting at 1.
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ColumnNumber() int
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// A string identifying the type of file, e.g. JSON, TOML, markdown etc.
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Type() string
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}
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var _ FileError = (*fileError)(nil)
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type fileError struct {
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offset int
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lineNumber int
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columnNumber int
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fileType string
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cause error
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}
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type fileErrorWithLineOffset struct {
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FileError
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offset int
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}
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func (e *fileErrorWithLineOffset) LineNumber() int {
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return e.FileError.LineNumber() + e.offset
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}
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func (e *fileError) LineNumber() int {
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return e.lineNumber
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}
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func (e *fileError) Offset() int {
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return e.offset
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}
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func (e *fileError) ColumnNumber() int {
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return e.columnNumber
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}
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func (e *fileError) Type() string {
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return e.fileType
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}
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func (e *fileError) Error() string {
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if e.cause == nil {
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return ""
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}
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return e.cause.Error()
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}
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func (f *fileError) Cause() error {
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return f.cause
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}
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// NewFileError creates a new FileError.
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func NewFileError(fileType string, offset, lineNumber, columnNumber int, err error) FileError {
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return &fileError{cause: err, fileType: fileType, offset: offset, lineNumber: lineNumber, columnNumber: columnNumber}
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}
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// UnwrapFileError tries to unwrap a FileError from err.
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// It returns nil if this is not possible.
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func UnwrapFileError(err error) FileError {
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for err != nil {
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switch v := err.(type) {
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case FileError:
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return v
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case causer:
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err = v.Cause()
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default:
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return nil
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}
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}
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return nil
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}
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// ToFileErrorWithOffset will return a new FileError with a line number
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// with the given offset from the original.
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func ToFileErrorWithOffset(fe FileError, offset int) FileError {
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return &fileErrorWithLineOffset{FileError: fe, offset: offset}
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}
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// ToFileError will convert the given error to an error supporting
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// the FileError interface.
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func ToFileError(fileType string, err error) FileError {
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for _, handle := range lineNumberExtractors {
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lno, col := handle(err)
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offset, typ := extractOffsetAndType(err)
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if fileType == "" {
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fileType = typ
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}
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if lno > 0 || offset != -1 {
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return NewFileError(fileType, offset, lno, col, err)
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}
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}
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// Fall back to the pointing to line number 1.
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return NewFileError(fileType, -1, 1, 1, err)
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}
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func extractOffsetAndType(e error) (int, string) {
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e = errors.Cause(e)
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switch v := e.(type) {
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case *json.UnmarshalTypeError:
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return int(v.Offset), "json"
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case *json.SyntaxError:
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return int(v.Offset), "json"
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default:
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return -1, ""
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}
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}
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