Python ExprParser._errHandler Beispiele

Beispiel #1

def main():
    input = InputStream(sys.stdin.read())
    lexer = ExprLexer(input)
    tokens = CommonTokenStream(lexer)
    parser = ExprParser(tokens)
    parser._errHandler = BailErrorStrategy()  # 设置错误处理
    tree = parser.expr()  # 取得一棵以 expr 为根的 AST
    print(tree.toStringTree(recog=parser))

Beispiel #2

def main():
    input = InputStream(sys.stdin.read())
    lexer = ExprLexer(input)
    tokens = CommonTokenStream(lexer)
    parser = ExprParser(tokens)
    parser._errHandler = BailErrorStrategy()  # 设置错误处理
    tree = parser.expr()  # 取得一棵以 expr 为根的 AST
    visitor = EvalVisitor()
    print(tree.accept(visitor))