ParserInterpreterData.java 文件源码

public static ParserInterpreterData buildFromSnapshot(DocumentSnapshot snapshot) {
    LexerInterpreterData lexerInterpreterData = LexerInterpreterData.buildFromSnapshot(snapshot);
    if (lexerInterpreterData == null) {
        return null;
    }

    List<SyntaxError> syntaxErrors = new ArrayList<>();
    Tool tool = new CustomTool(snapshot);
    tool.errMgr = new CustomErrorManager(tool);
    tool.addListener(new ErrorListener(snapshot, tool, syntaxErrors));
    tool.libDirectory = new File(snapshot.getVersionedDocument().getFileObject().getPath()).getParent();

    ANTLRStringStream stream = new ANTLRStringStream(snapshot.getText());
    stream.name = snapshot.getVersionedDocument().getFileObject().getNameExt();
    GrammarRootAST ast = tool.parse(stream.name, stream);
    Grammar grammar = tool.createGrammar(ast);
    if (grammar instanceof LexerGrammar) {
        return null;
    }

    tool.process(grammar, false);

    ParserInterpreterData data = new ParserInterpreterData();

    // start by filling in the lexer data
    data.lexerInterpreterData = lexerInterpreterData;

    // then fill in the parser data
    data.grammarFileName = grammar.fileName;
    data.serializedAtn = ATNSerializer.getSerializedAsString(grammar.atn, Arrays.asList(grammar.getRuleNames()));
    data.vocabulary = grammar.getVocabulary();
    data.ruleNames = new ArrayList<>(grammar.rules.keySet());

    return data;
}