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// Copyright 2018 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 law 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 errors contains common Hugo errors and error related utilities.
package herrors
import (
"bufio"
"fmt"
"io"
"strings"
"github.com/gohugoio/hugo/helpers"
"github.com/spf13/afero"
)
var fileErrorFormat = "\"%s:%d:%d\": %s"
// LineMatcher is used to match a line with an error.
type LineMatcher func(le FileError, lineNumber int, line string) bool
// SimpleLineMatcher matches if the current line number matches the line number
// in the error.
var SimpleLineMatcher = func(le FileError, lineNumber int, line string) bool {
return le.LineNumber() == lineNumber
}
// ErrorContext contains contextual information about an error. This will
// typically be the lines surrounding some problem in a file.
type ErrorContext struct {
// The source filename.
Filename string
// If a match will contain the matched line and up to 2 lines before and after.
// Will be empty if no match.
Lines []string
// The position of the error in the Lines above. 0 based.
Pos int
// The linenumber in the source file from where the Lines start. Starting at 1.
LineNumber int
// The column number in the source file. Starting at 1.
ColumnNumber int
// The lexer to use for syntax highlighting.
// https://gohugo.io/content-management/syntax-highlighting/#list-of-chroma-highlighting-languages
ChromaLexer string
}
var _ causer = (*ErrorWithFileContext)(nil)
// ErrorWithFileContext is an error with some additional file context related
// to that error.
type ErrorWithFileContext struct {
cause error
ErrorContext
}
func (e *ErrorWithFileContext) Error() string {
return fmt.Sprintf(fileErrorFormat, e.Filename, e.LineNumber, e.ColumnNumber, e.cause.Error())
}
func (e *ErrorWithFileContext) Cause() error {
return e.cause
}
// WithFileContextForFile will try to add a file context with lines matching the given matcher.
// If no match could be found, the original error is returned with false as the second return value.
func WithFileContextForFile(e error, realFilename, filename string, fs afero.Fs, matcher LineMatcher) (error, bool) {
f, err := fs.Open(filename)
if err != nil {
return e, false
}
defer f.Close()
return WithFileContext(e, realFilename, f, matcher)
}
// WithFileContextForFile will try to add a file context with lines matching the given matcher.
// If no match could be found, the original error is returned with false as the second return value.
func WithFileContext(e error, realFilename string, r io.Reader, matcher LineMatcher) (error, bool) {
if e == nil {
panic("error missing")
}
le := UnwrapFileError(e)
if le == nil {
var ok bool
if le, ok = ToFileError("", e).(FileError); !ok {
return e, false
}
}
errCtx := locateError(r, le, matcher)
errCtx.Filename = realFilename
if errCtx.LineNumber == -1 {
return e, false
}
if le.Type() != "" {
errCtx.ChromaLexer = chromaLexerFromType(le.Type())
} else {
errCtx.ChromaLexer = chromaLexerFromFilename(realFilename)
}
return &ErrorWithFileContext{cause: e, ErrorContext: errCtx}, true
}
// UnwrapErrorWithFileContext tries to unwrap an ErrorWithFileContext from err.
// It returns nil if this is not possible.
func UnwrapErrorWithFileContext(err error) *ErrorWithFileContext {
for err != nil {
switch v := err.(type) {
case *ErrorWithFileContext:
return v
case causer:
err = v.Cause()
default:
return nil
}
}
return nil
}
func chromaLexerFromType(fileType string) string {
switch fileType {
case "html", "htm":
return "go-html-template"
}
return fileType
}
func chromaLexerFromFilename(filename string) string {
if strings.Contains(filename, "layouts") {
return "go-html-template"
}
ext := helpers.ExtNoDelimiter(filename)
return chromaLexerFromType(ext)
}
func locateErrorInString(le FileError, src string, matcher LineMatcher) ErrorContext {
return locateError(strings.NewReader(src), nil, matcher)
}
func locateError(r io.Reader, le FileError, matches LineMatcher) ErrorContext {
var errCtx ErrorContext
s := bufio.NewScanner(r)
errCtx.ColumnNumber = 1
if le != nil {
errCtx.ColumnNumber = le.ColumnNumber()
}
lineNo := 0
var buff [6]string
i := 0
errCtx.Pos = -1
for s.Scan() {
lineNo++
txt := s.Text()
buff[i] = txt
if errCtx.Pos != -1 && i >= 5 {
break
}
if errCtx.Pos == -1 && matches(le, lineNo, txt) {
errCtx.Pos = i
errCtx.LineNumber = lineNo
}
if errCtx.Pos == -1 && i == 2 {
// Shift left
buff[0], buff[1] = buff[i-1], buff[i]
} else {
i++
}
}
// Go's template parser will typically report "unexpected EOF" errors on the
// empty last line that is supressed by the scanner.
// Do an explicit check for that.
if errCtx.Pos == -1 {
lineNo++
if matches(le, lineNo, "") {
buff[i] = ""
errCtx.Pos = i
errCtx.LineNumber = lineNo
i++
}
}
if errCtx.Pos != -1 {
low := errCtx.Pos - 2
if low < 0 {
low = 0
}
high := i
errCtx.Lines = buff[low:high]
} else {
errCtx.Pos = -1
errCtx.LineNumber = -1
}
return errCtx
}
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