在 Erlang 中将字符串转换为元组

Question

如何在 Erlang 中将字符串转换为元组？

A = "{"hi","how"}"

我希望它转换成

B = {"hi","how"}.

当我调用函数 list_to_tuple(A) 时，它会给出输出：

{123,60,60,34,106,105,100,34,62,62,44,34,104,105,34,125}

而不是{"hi","how"}。

Answer 1

您应该使用erl_scan 模块对字符串进行标记，并使用erl_parse 将标记转换为erlang 术语。

% Note the '.' at the end of the expression inside string.
% The string has to be a valid expression terminated by a '.'.
1> Str = "{\"x\",\"y\"}.".  
"{\"x\",\"y\"}."
2> {ok, Ts, _} = erl_scan:string(Str).
{ok,[{'{',1},
     {string,1,"x"},
     {',',1},
     {string,1,"y"},
     {'}',1},
     {dot,1}],
    1}
3> {ok, Tup} = erl_parse:parse_term(Ts).
{ok,{"x","y"}}
4> Tup.
{"x","y"}