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
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/*
* Copyright (c) 2003-2008, John Wiegley. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of New Artisans LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _PARSEXP_H
#define _PARSEXP_H
#include "valexpr.h"
namespace ledger {
namespace expr {
DECLARE_EXCEPTION(error, parse_error);
class parser_t : public noncopyable
{
#define EXPR_PARSE_NORMAL 0x00
#define EXPR_PARSE_PARTIAL 0x01
#define EXPR_PARSE_RELAXED 0x02
#define EXPR_PARSE_NO_MIGRATE 0x04
#define EXPR_PARSE_NO_REDUCE 0x08
#define EXPR_PARSE_NO_ASSIGN 0x10
#define EXPR_PARSE_NO_DATES 0x20
public:
typedef uint_least8_t flags_t;
private:
struct token_t : public noncopyable
{
enum kind_t {
VALUE, // any kind of literal value
SHORT_ACCOUNT_MASK,
CODE_MASK,
COMMODITY_MASK,
PAYEE_MASK,
NOTE_MASK,
ACCOUNT_MASK,
IDENT, // [A-Za-z_][-A-Za-z0-9_:]*
DOLLAR, // $
AT_SYM, // @
DOT, // .
DOTDOT, // ..
SLASH, // /
LPAREN, // (
RPAREN, // )
LBRACKET, // [
RBRACKET, // ]
EQUAL, // =
NEQUAL, // !=
LESS, // <
LESSEQ, // <=
GREATER, // >
GREATEREQ, // >=
MINUS, // -
PLUS, // +
STAR, // *
KW_DIV,
EXCLAM, // !
KW_AND,
KW_OR,
KW_MOD,
COMMA, // ,
TOK_EOF,
UNKNOWN
} kind;
char symbol[3];
value_t value;
std::size_t length;
explicit token_t() : kind(UNKNOWN), length(0) {
TRACE_CTOR(token_t, "");
}
~token_t() throw() {
TRACE_DTOR(token_t);
}
token_t& operator=(const token_t& other) {
if (&other == this)
return *this;
assert(false);
return *this;
}
void clear() {
kind = UNKNOWN;
length = 0;
value = NULL_VALUE;
symbol[0] = '\0';
symbol[1] = '\0';
symbol[2] = '\0';
}
void parse_ident(std::istream& in);
void next(std::istream& in, flags_t flags);
void rewind(std::istream& in);
void unexpected();
static void unexpected(char c, char wanted = '\0');
};
mutable token_t lookahead;
mutable bool use_lookahead;
token_t& next_token(std::istream& in, flags_t tflags) const
{
if (use_lookahead)
use_lookahead = false;
else
lookahead.next(in, tflags);
return lookahead;
}
void push_token(const token_t& tok) const
{
assert(&tok == &lookahead);
use_lookahead = true;
}
void push_token() const
{
use_lookahead = true;
}
ptr_op_t parse_value_term(std::istream& in, scope_t& scope,
const flags_t flags) const;
ptr_op_t parse_unary_expr(std::istream& in, scope_t& scope,
const flags_t flags) const;
ptr_op_t parse_mul_expr(std::istream& in, scope_t& scope,
const flags_t flags) const;
ptr_op_t parse_add_expr(std::istream& in, scope_t& scope,
const flags_t flags) const;
ptr_op_t parse_logic_expr(std::istream& in, scope_t& scope,
const flags_t flags) const;
ptr_op_t parse_and_expr(std::istream& in, scope_t& scope,
const flags_t flags) const;
ptr_op_t parse_or_expr(std::istream& in, scope_t& scope,
const flags_t flags) const;
ptr_op_t parse_querycolon_expr(std::istream& in, scope_t& scope,
const flags_t flags) const;
ptr_op_t parse_value_expr(std::istream& in, scope_t& scope,
const flags_t flags) const;
value_expr parse_expr(std::istream& in, string& str,
scope_t& scope, const flags_t flags) {
try {
ptr_op_t top_node = parse_value_expr(in, scope, flags);
if (use_lookahead) {
use_lookahead = false;
lookahead.rewind(in);
}
lookahead.clear();
return value_expr(top_node, str);
}
catch (error * err) {
err->context.push_back
(new line_context(str, (long)in.tellg() - 1,
"While parsing value expression:"));
throw err;
}
}
public:
parser_t() : use_lookahead(false) {}
value_expr parse(std::istream& in,
const flags_t flags = EXPR_PARSE_RELAXED)
{
return parse_expr(in, empty_string, *global_scope, flags);
}
value_expr parse(std::istream& in, scope_t& scope,
const flags_t flags = EXPR_PARSE_RELAXED)
{
return parse_expr(in, empty_string, scope, flags);
}
value_expr parse(string& str, const flags_t flags = EXPR_PARSE_RELAXED)
{
std::istringstream stream(str);
return parse_expr(stream, str, *global_scope, flags);
}
value_expr parse(string& str, scope_t& scope,
const flags_t flags = EXPR_PARSE_RELAXED)
{
std::istringstream stream(str);
return parse_expr(stream, str, scope, flags);
}
};
} // namespace expr
} // namespace ledger
#endif // _PARESXP_H
|
