在Erlang中将字符串转换为元组 [英] Converting string to tuple in Erlang

问题描述

如何在Erlang中将字符串转换为元组？

How to convert string to tuple in Erlang?

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

我希望将其转换为

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

当我调用函数 list_to_tuple（A）时，它会输出：

When I call function list_to_tuple(A) it gives output:

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

，而不是 { hi， how} 。

推荐答案

您应使用 erl_scan 模块对字符串进行标记，然后 erl_parse 进行转换

You should use erl_scan module to tokenize the string and erl_parse to convert the tokens to a erlang term.

% 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"}

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