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// Package parser parses conf language.
//
// This file is part of conf library.
// Copyright (C) 2026 Alexander NeonXP Kiryukhin <i@neonxp.ru>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package parser
import (
"bytes"
"errors"
"fmt"
"strings"
)
type ErrorLister interface {
Errors() []error
}
func (e errList) Errors() []error {
return e
}
// ParserError is the public interface to errors of type parserError
type ParserError interface {
Error() string
InnerError() error
Pos() (int, int, int)
Expected() []string
}
func (p *parserError) InnerError() error {
return p.Inner
}
func (p *parserError) Pos() (line, col, offset int) {
return p.pos.line, p.pos.col, p.pos.offset
}
func (p *parserError) Expected() []string {
return p.expected
}
func CaretErrors(err error, input string) error {
if el, ok := err.(ErrorLister); ok {
var buffer bytes.Buffer
for _, e := range el.Errors() {
if err := caretError(e, input); err != nil {
buffer.WriteString(err.Error())
}
}
return errors.New(buffer.String())
}
return err
}
func caretError(err error, input string) error {
if parserErr, ok := err.(ParserError); ok {
_, col, off := parserErr.Pos()
line := extractLine(input, off)
if col >= len(line) {
col = len(line) - 1
} else {
if col > 0 {
col--
}
}
if col < 0 {
col = 0
}
pos := col
for _, chr := range line[:col] {
if chr == '\t' {
pos += 7
}
}
return fmt.Errorf("%s\n%s\n%w", line, strings.Repeat(" ", pos)+"^", err)
}
return err
}
func extractLine(input string, initPos int) string {
if initPos < 0 {
initPos = 0
}
if initPos >= len(input) && len(input) > 0 {
initPos = len(input) - 1
}
startPos := initPos
endPos := initPos
for ; startPos > 0; startPos-- {
if input[startPos] == '\n' {
if startPos != initPos {
startPos++
break
}
}
}
for ; endPos < len(input); endPos++ {
if input[endPos] == '\n' {
if endPos == initPos {
endPos++
}
break
}
}
return input[startPos:endPos]
}
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