feat: add config_parser

pkg/config_parser/config_parser.go

@@ -0,0 +1,34 @@
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) since 2023, mzz2017 (mzz@tuta.io). All rights reserved.
+ */
+
+package config_parser
+
+import (
+	"fmt"
+	"github.com/antlr/antlr4/runtime/Go/antlr/v4"
+	"github.com/v2rayA/dae-config-dist/go/dae_config"
+)
+
+func Parse(in string) (sections []*Section, err error) {
+	errorListener := NewConsoleErrorListener()
+	lexer := dae_config.Newdae_configLexer(antlr.NewInputStream(in))
+	lexer.RemoveErrorListeners()
+	lexer.AddErrorListener(errorListener)
+	input := antlr.NewCommonTokenStream(lexer, 0)
+
+	parser := dae_config.Newdae_configParser(input)
+	parser.RemoveErrorListeners()
+	parser.AddErrorListener(errorListener)
+	parser.BuildParseTrees = true
+	tree := parser.Start()
+
+	walker := NewWalker(parser)
+	antlr.ParseTreeWalkerDefault.Walk(walker, tree)
+	if errorListener.ErrorBuilder.Len() != 0 {
+		return nil, fmt.Errorf("%v", errorListener.ErrorBuilder.String())
+	}
+
+	return walker.Sections, nil
+}