Python symbol.eval_input方法代碼示例

# 需要導入模塊: import symbol [as 別名]
# 或者: from symbol import eval_input [as 別名]
def compile_node(self, node):
        ### emit a line-number node?
        n = node[0]

        if n == symbol.encoding_decl:
            self.encoding = node[2]
            node = node[1]
            n = node[0]

        if n == symbol.single_input:
            return self.single_input(node[1:])
        if n == symbol.file_input:
            return self.file_input(node[1:])
        if n == symbol.eval_input:
            return self.eval_input(node[1:])
        if n == symbol.lambdef:
            return self.lambdef(node[1:])
        if n == symbol.funcdef:
            return self.funcdef(node[1:])
        if n == symbol.classdef:
            return self.classdef(node[1:])

        raise WalkerError, ('unexpected node type', n) 

# 需要導入模塊: import symbol [as 別名]
# 或者: from symbol import eval_input [as 別名]
def eval_input(self, nodelist):
        # from the built-in function input()
        ### is this sufficient?
        return Expression(self.com_node(nodelist[0])) 

# 需要導入模塊: import symbol [as 別名]
# 或者: from symbol import eval_input [as 別名]
def _get_forbidden_symbols():
    """
    Returns a list of symbol codes representing statements that are *not*
    wanted in configuration files.
    """
    try:
        # Python 2.5:
        symlst = [symbol.break_stmt, symbol.classdef, symbol.continue_stmt,
                  symbol.decorator, symbol.decorators, symbol.eval_input,
                  symbol.except_clause, symbol.exec_stmt, symbol.flow_stmt,
                  symbol.for_stmt, symbol.fpdef, symbol.fplist, symbol.funcdef,
                  symbol.global_stmt, symbol.import_as_name, symbol.import_as_names,
                  symbol.import_from, symbol.import_name, symbol.import_stmt,
                  symbol.lambdef, symbol.old_lambdef, symbol.print_stmt,
                  symbol.raise_stmt, symbol.try_stmt, symbol.while_stmt,
                  symbol.with_stmt, symbol.with_var, symbol.yield_stmt,
                  symbol.yield_expr]
        
    except AttributeError:
        # Python 2.4:        
        symlst = [symbol.break_stmt, symbol.classdef, symbol.continue_stmt,
                  symbol.decorator, symbol.decorators, symbol.eval_input,
                  symbol.except_clause, symbol.exec_stmt, symbol.flow_stmt,
                  symbol.for_stmt, symbol.fpdef, symbol.fplist, symbol.funcdef,
                  symbol.global_stmt, symbol.import_as_name, symbol.import_as_names,
                  symbol.import_from, symbol.import_name, symbol.import_stmt,
                  symbol.lambdef, symbol.print_stmt, symbol.raise_stmt,
                  symbol.try_stmt, symbol.while_stmt]
    
    return symlst 

# 需要導入模塊: import symbol [as 別名]
# 或者: from symbol import eval_input [as 別名]
def _parseconf(confstr):
    """
    Parse the configuration *confstr* string and remove anything else
    than the supported constructs, which are:

    Assignments, bool, dict list, string, float, bool, and, or, xor,
    arithmetics, string expressions and if..then..else.

    The *entire* statement containing the unsupported statement is removed
    from the parser; the effect is that the whole expression is ignored
    from the 'root' down.  

    The modified AST object is returned to the Python parser for evaluation. 
    """
    # Initialise the parse tree, convert to list format and get a list of
    # the symbol ID's for the unwanted statements. Might raise SyntaxError.
    
    ast = parser.suite(confstr)
    #ast = parser.expr(confstr)
    stmts = parser.ast2list(ast)
    rmsym = _get_forbidden_symbols()

    result = list()
    
    # copy 256: 'single_input', 257: 'file_input' or 258: 'eval_input'. The
    # parse tree must begin with one of these to compile back to an AST obj.

    result.append(stmts[0])

    # NOTE: This might be improved with reduce(...) builtin!? How can we get
    #       line number for better warnings?

    for i in range(1, len(stmts)):
        # censor the parse tree produced from parsing the configuration.
        if _check_ast(stmts[i], rmsym):
            result.append(stmts[i])
        else:
            pass
        
    return parser.sequence2ast(result)