Antlr4.AntlrTool.LoadImportedGrammar C# (CSharp) Method

        public virtual Grammar LoadImportedGrammar(Grammar g, GrammarAST nameNode)
        {
            string name = nameNode.Text;
            Grammar imported;
            if (!importedGrammars.TryGetValue(name, out imported) || imported == null)
            {
                g.tool.Log("grammar", "load " + name + " from " + g.fileName);
                string importedFile = null;
                foreach (string extension in ALL_GRAMMAR_EXTENSIONS)
                {
                    importedFile = GetImportedGrammarFile(g, name + extension);
                    if (importedFile != null)
                    {
                        break;
                    }
                }

                if (importedFile == null)
                {
                    errMgr.GrammarError(ErrorType.CANNOT_FIND_IMPORTED_GRAMMAR, g.fileName, nameNode.Token, name);
                    return null;
                }

                string absolutePath = Path.GetFullPath(importedFile);
                string fileContent = File.ReadAllText(absolutePath, Encoding.GetEncoding(grammarEncoding));
                char[] fileChars = fileContent.ToCharArray();
                ANTLRStringStream @in = new ANTLRStringStream(fileChars, fileChars.Length, importedFile);
                GrammarRootAST root = Parse(g.fileName, @in);
                if (root == null)
                {
                    return null;
                }

                imported = CreateGrammar(root);
                imported.fileName = absolutePath;
                importedGrammars[root.GetGrammarName()] = imported;
            }

            return imported;
        }