OpenEuphoria

RE: command_line() - convert a sequence to an atom value?

• Posted by "C. K. Lester" <cklester at yahoo.com> Aug 14, 2001
• 416 views

> it would be a whole lot nicer if there happens to be a way of storing the
> numerical value of the command_line() sequence {51,48} as 30 in my atom.
>
> Any ideas?
>
> Joel Garcia

>From the EUPHORIA Reference Manual:

value
Syntax: include get.e
s = value(st)
Description: Read the string representation of a Euphoria object, and
compute the value of that object. A 2-element sequence, {error_status,
value} is actually returned, where error_status can be one of:
     GET_SUCCESS -- a valid object representation was found
    GET_EOF     -- end of string reached too soon
    GET_FAIL    -- syntax is wrong


Comments: This works the same as get(), but it reads from a string that you
supply, rather than from a file or device.
After reading one valid representation of a Euphoria object, value() will
stop reading and ignore any additional characters in the string. For
example, "36" and "36P" will both give you {GET_SUCCESS, 36}.

Example 1:
 s = value("12345"}
-- s is {GET_SUCCESS, 12345}



Example 2:
 s = value("{0, 1, -99.9}")
-- s is {GET_SUCCESS, {0, 1, -99.9}}



Example 3:
 s = value("+++")
-- s is {GET_FAIL, 0}