132 lines
3.3 KiB
Go
132 lines
3.3 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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// limitations 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/gohugoio/hugo/common/text"
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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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text.Positioner
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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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position text.Position
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fileType string
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cause error
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}
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// Position returns the text position of this error.
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func (e fileError) Position() text.Position {
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return e.position
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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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pos := text.Position{Offset: offset, LineNumber: lineNumber, ColumnNumber: columnNumber}
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return &fileError{cause: err, fileType: fileType, position: pos}
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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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pos := fe.Position()
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return ToFileErrorWithLineNumber(fe, pos.LineNumber+offset)
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}
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// ToFileErrorWithOffset will return a new FileError with the given line number.
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func ToFileErrorWithLineNumber(fe FileError, lineNumber int) FileError {
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pos := fe.Position()
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pos.LineNumber = lineNumber
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return &fileError{cause: fe, fileType: fe.Type(), position: pos}
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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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