Arithmetic evaluation/Ada: Difference between revisions

The implementation provides an advanced error handling and skipping blanks and Ada comments (these are taken from the library).

with Ada.Unchecked_Deallocation;

with Parsers.String_Source; use Parsers.String_Source;

);

end Parsers.Simple;

Here is the implementation of the package.

with Ada.Characters.Handling; use Ada.Characters.Handling;

with Ada.Exceptions; use Ada.Exceptions;

end Parsers.Simple;

The next is a little test. It reads a line from the keyboard and then evaluates it. The program stops when the input is empty:

with Ada.Exceptions; use Ada.Exceptions;

with Ada.Text_IO; use Ada.Text_IO;

end loop;

end Test_Simple_Parser;

Sample exchange. When the expression is evaluated its range in the source string is indicated. Upon errors, the location of is shown as well:

<pre>