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// Copyright 2022 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable lfmtaw or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package herrors
import (
"encoding/json"
"fmt"
"io"
"path/filepath"
"github.com/gohugoio/hugo/common/paths"
"github.com/gohugoio/hugo/common/text"
"github.com/pelletier/go-toml/v2"
"github.com/spf13/afero"
"github.com/tdewolff/parse/v2"
"errors"
)
// FileError represents an error when handling a file: Parsing a config file,
// execute a template etc.
type FileError interface {
error
// ErroContext holds some context information about the error.
ErrorContext() *ErrorContext
text.Positioner
// UpdatePosition updates the position of the error.
UpdatePosition(pos text.Position) FileError
// UpdateContent updates the error with a new ErrorContext from the content of the file.
UpdateContent(r io.Reader, linematcher LineMatcherFn) FileError
}
// Unwrapper can unwrap errors created with fmt.Errorf.
type Unwrapper interface {
Unwrap() error
}
var (
_ FileError = (*fileError)(nil)
_ Unwrapper = (*fileError)(nil)
)
func (fe *fileError) UpdatePosition(pos text.Position) FileError {
oldFilename := fe.Position().Filename
if pos.Filename != "" && fe.fileType == "" {
_, fe.fileType = paths.FileAndExtNoDelimiter(filepath.Clean(pos.Filename))
}
if pos.Filename == "" {
pos.Filename = oldFilename
}
fe.position = pos
return fe
}
func (fe *fileError) UpdateContent(r io.Reader, linematcher LineMatcherFn) FileError {
if linematcher == nil {
linematcher = SimpleLineMatcher
}
var (
posle = fe.position
ectx *ErrorContext
)
if posle.LineNumber <= 1 && posle.Offset > 0 {
// Try to locate the line number from the content if offset is set.
ectx = locateError(r, fe, func(m LineMatcher) int {
if posle.Offset >= m.Offset && posle.Offset < m.Offset+len(m.Line) {
lno := posle.LineNumber - m.Position.LineNumber + m.LineNumber
m.Position = text.Position{LineNumber: lno}
return linematcher(m)
}
return -1
})
} else {
ectx = locateError(r, fe, linematcher)
}
if ectx.ChromaLexer == "" {
if fe.fileType != "" {
ectx.ChromaLexer = chromaLexerFromType(fe.fileType)
} else {
ectx.ChromaLexer = chromaLexerFromFilename(fe.Position().Filename)
}
}
fe.errorContext = ectx
if ectx.Position.LineNumber > 0 {
fe.position.LineNumber = ectx.Position.LineNumber
}
if ectx.Position.ColumnNumber > 0 {
fe.position.ColumnNumber = ectx.Position.ColumnNumber
}
return fe
}
type fileError struct {
position text.Position
errorContext *ErrorContext
fileType string
cause error
}
func (e *fileError) ErrorContext() *ErrorContext {
return e.errorContext
}
// Position returns the text position of this error.
func (e fileError) Position() text.Position {
return e.position
}
func (e *fileError) Error() string {
return fmt.Sprintf("%s: %s", e.position, e.cause)
}
func (e *fileError) Unwrap() error {
return e.cause
}
// NewFileError creates a new FileError that wraps err.
// The value for name should identify the file, the best
// being the full filename to the file on disk.
func NewFileError(name string, err error) FileError {
// Filetype is used to determine the Chroma lexer to use.
fileType, pos := extractFileTypePos(err)
pos.Filename = name
if fileType == "" {
_, fileType = paths.FileAndExtNoDelimiter(filepath.Clean(name))
}
return &fileError{cause: err, fileType: fileType, position: pos}
}
// NewFileErrorFromPos will use the filename and line number from pos to create a new FileError, wrapping err.
func NewFileErrorFromPos(pos text.Position, err error) FileError {
// Filetype is used to determine the Chroma lexer to use.
fileType, _ := extractFileTypePos(err)
if fileType == "" {
_, fileType = paths.FileAndExtNoDelimiter(filepath.Clean(pos.Filename))
}
return &fileError{cause: err, fileType: fileType, position: pos}
}
// NewFileErrorFromFile is a convenience method to create a new FileError from a file.
func NewFileErrorFromFile(err error, filename, realFilename string, fs afero.Fs, linematcher LineMatcherFn) FileError {
if err == nil {
panic("err is nil")
}
if linematcher == nil {
linematcher = SimpleLineMatcher
}
f, err2 := fs.Open(filename)
if err2 != nil {
return NewFileError(realFilename, err)
}
defer f.Close()
return NewFileError(realFilename, err).UpdateContent(f, linematcher)
}
// Cause returns the underlying error or itself if it does not implement Unwrap.
func Cause(err error) error {
if u := errors.Unwrap(err); u != nil {
return u
}
return err
}
func extractFileTypePos(err error) (string, text.Position) {
err = Cause(err)
var fileType string
// Default to line 1 col 1 if we don't find any better.
pos := text.Position{
Offset: -1,
LineNumber: 1,
ColumnNumber: 1,
}
// JSON errors.
offset, typ := extractOffsetAndType(err)
if fileType == "" {
fileType = typ
}
if offset >= 0 {
pos.Offset = offset
}
// The error type from the minifier contains line number and column number.
if line, col := exctractLineNumberAndColumnNumber(err); line >= 0 {
pos.LineNumber = line
pos.ColumnNumber = col
return fileType, pos
}
// Look in the error message for the line number.
for _, handle := range lineNumberExtractors {
lno, col := handle(err)
if lno > 0 {
pos.ColumnNumber = col
pos.LineNumber = lno
break
}
}
return
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