1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
/* Copyright (C) 2021 Free Software Foundation, Inc.
Contributed by Oracle.
This file is part of GNU Binutils.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#ifndef _QLPARSER_H
#define _QLPARSER_H
#include <sstream>
#include <istream>
#include <iostream>
#include "Expression.h"
/* This class contains parser inputs (a string, if non-NULL: if NULL, use cin),
and outputs (obtained via operator(), which resets the output
expression). The destructor deletes the returned expression to allow
exception throws on syntax error to clean up properly. */
namespace QL
{
struct Result
{
std::stringstream streamify;
public:
std::istream in;
Expression *out;
Result () : in (std::cin.rdbuf ()), out (NULL) { }
Result (const char *instr) : streamify (std::string (instr)),
in (streamify.rdbuf ()), out (NULL) { }
Expression *operator() ()
{
Expression *o = out;
out = NULL;
return o;
}
~Result ()
{
delete out;
}
};
};
#endif /* _QLPARSER_H */
|
