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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 (
"strconv"
"errors"
"go.neonxp.ru/conf/model"
)
func toAnySlice(v any) []any {
if v == nil {
return nil
}
if v, ok := v.([]any); ok && len(v) == 0 {
return nil
}
return v.([]any)
}
}
Config ← _ directives:( Directive* ) EOF {
if directives == nil {
return model.Group{}, nil
}
groupAny := toAnySlice(directives)
groupSl := make(model.Group, len(groupAny))
for i, e := range groupAny {
groupSl[i] = e.(model.Directive)
}
return groupSl, nil
}
Group ← '{' _ directives:( Directive* ) _ '}' {
if directives == nil {
return model.Group{}, nil
}
groupAny := toAnySlice(directives)
groupSl := make(model.Group, len(groupAny))
for i, e := range groupAny {
groupSl[i] = e.(model.Directive)
}
return groupSl, nil
}
Directive ← name:Ident _ args:Args _ {
rawArgs := args.([]any)
argsSlice := make([]any, 0, len(rawArgs))
if len(rawArgs) > 0 {
for _, s := range rawArgs {
if s == nil {
continue
}
if l, ok := s.([]any); ok {
l = slices.DeleteFunc(l, func(x any) bool { return x == nil })
argsSlice = append(argsSlice, l...)
}
}
}
return model.Directive{Name: name.(model.Ident), RawValues: argsSlice}, nil
}
Args ← Values? (Group / EOS)
Values ← vals:Value* { return toAnySlice(vals), nil }
Value ← val:( Ident / String / Number ) __ { return val, nil }
// {{{ Строки
String ← ( '"' DoubleStringChar* '"' / "'" SingleStringChar "'" / '`' RawStringChar* '`' ) {
return strconv.Unquote(string(c.text))
}
DoubleStringChar ← !( '"' / "\\" / EOL ) SourceChar / "\\" DoubleStringEscape
SingleStringChar ← !( "'" / "\\" / EOL ) SourceChar / "\\" SingleStringEscape
RawStringChar ← !'`' SourceChar
DoubleStringEscape ← '"' / CommonEscapeSequence
SingleStringEscape ← "'" / CommonEscapeSequence
CommonEscapeSequence ← SingleCharEscape / OctalEscape / HexEscape / LongUnicodeEscape / ShortUnicodeEscape
SingleCharEscape ← 'a' / 'b' / 'n' / 'f' / 'r' / 't' / 'v' / '\\'
OctalEscape ← OctalDigit OctalDigit OctalDigit
HexEscape ← 'x' HexDigit HexDigit
LongUnicodeEscape ← 'U' HexDigit HexDigit HexDigit HexDigit HexDigit HexDigit HexDigit HexDigit
ShortUnicodeEscape ← 'u' HexDigit HexDigit HexDigit HexDigit
OctalDigit ← [0-7]
HexDigit ← [0-9a-f]i
SourceChar ← .
// }}}
// {{{ Числа
Number ← '-'? UInteger ('.' DecimalDigit+)? Exponent? {
if i, err := strconv.Atoi(string(c.text)); err == nil {
return i, nil
}
return strconv.ParseFloat(string(c.text), 64)
}
UInteger ← '0' / NonZeroDecimalDigit DecimalDigit*
Exponent ← 'e'i [+-]? DecimalDigit+
DecimalDigit ← [0-9]
NonZeroDecimalDigit ← [1-9]
// }}}
// {{{ Идентификатор
Ident ← (Alpha / AllowedSpec) (Alpha / AllowedSpec / Number)* {
switch string(c.text) {
case "true":
return true, nil
case "false":
return false, nil
default:
return model.Ident(c.text), nil
}
}
Alpha ← [a-zA-Z]
AllowedSpec ← '$' / '@' / '%' / '_' / '-' / '+'
// }}}
// {{{ Оставшиеся спец моменты
Comment ← '#' ( ![\r\n] . )*
__ ← ( Whitespace / EOL / Comment )*
_ ← ( [ \t\r\n] / Comment )*
Whitespace ← [ \t\r]
EOL ← '\n'
EOS ← __ ';' { return nil, nil } / _ Comment? EOL { return nil, nil } / __ EOF { return nil, nil }
EOF ← !.
// }}}
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