blob: 8768e14790bc3083db3d3eb2877bc65377cc5546 (
plain) (
blame)
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
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
#include "parser.hpp"
// parser.cpp - build a tree of S-expressions
//
// Copyright © 2014 Ben Longbons <b.r.longbons@gmail.com>
//
// This file is part of The Mana World (Athena server)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <cerrno>
#include "../strings/zstring.hpp"
#include "../strings/xstring.hpp"
#include "../poison.hpp"
namespace tmwa
{
namespace sexpr
{
bool token_is_int(ZString s, int64_t& out, bool& ok)
{
if (!s)
return false;
if (s.startswith('-') || s.xslice_h(1).is_digit10())
{
const char *z = s.c_str();
char *end = nullptr;
errno = 0;
out = strtoll(z, &end, 0);
if (errno)
ok = false;
return !*end;
}
return false;
}
bool parse(Lexer& lex, SExpr& out)
{
out._list.clear();
out._str = RString();
bool rv = true;
out._span.begin = lex.span().begin;
switch (lex.peek())
{
default:
return false;
case TOK_STRING:
out._type = STRING;
out._str = lex.val_string();
break;
case TOK_TOKEN:
out._type = TOKEN;
out._str = lex.val_string();
if (token_is_int(out._str, out._int, rv))
out._type = INT;
break;
case TOK_OPEN:
out._type = LIST;
lex.adv();
while (lex.peek() != TOK_CLOSE)
{
SExpr tmp;
if (!parse(lex, tmp))
return false;
out._list.push_back(std::move(tmp));
}
break;
}
out._span.end = lex.span().end;
lex.adv();
return rv;
}
} // namespace sexpr
} // namespace tmwa
|
