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
236
237
238
239
240
241
|
/* CLI utilities.
Copyright (C) 2011-2018 Free Software Foundation, Inc.
This file is part of GDB.
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 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef CLI_UTILS_H
#define CLI_UTILS_H
/* *PP is a string denoting a number. Get the number. Advance *PP
after the string and any trailing whitespace.
The string can either be a number, or "$" followed by the name of a
convenience variable, or ("$" or "$$") followed by digits.
TRAILER is a character which can be found after the number; most
commonly this is `-'. If you don't want a trailer, use \0. */
extern int get_number_trailer (const char **pp, int trailer);
/* Convenience. Like get_number_trailer, but with no TRAILER. */
extern int get_number (const char **);
/* Like the above, but takes a non-const "char **". */
extern int get_number (char **);
/* Extract from ARGS the arguments [-q] [-t TYPEREGEXP] [--] NAMEREGEXP.
The caller is responsible to initialize *QUIET to false, *REGEXP
and *T_REGEXP to "".
extract_info_print_args can then be called iteratively to search
for valid arguments, as part of a 'main parsing loop' searching for
-q/-t/-- arguments together with other flags and options.
Returns true and updates *ARGS + one of *QUIET, *REGEXP, *T_REGEXP if
it finds a valid argument.
Returns false if no valid argument is found at the beginning of ARGS. */
extern bool extract_info_print_args (const char **args,
bool *quiet,
std::string *regexp,
std::string *t_regexp);
/* Throws an error telling the user that ARGS starts with an option
unrecognized by COMMAND. */
extern void report_unrecognized_option_error (const char *command,
const char *args);
/* Builds the help string for a command documented by PREFIX,
followed by the extract_info_print_args help for ENTITY_KIND. */
const char *info_print_args_help (const char *prefix,
const char *entity_kind);
/* Parse a number or a range.
A number will be of the form handled by get_number.
A range will be of the form <number1> - <number2>, and
will represent all the integers between number1 and number2,
inclusive. */
class number_or_range_parser
{
public:
/* Default construction. Must call init before calling
get_next. */
number_or_range_parser () {}
/* Calls init automatically. */
number_or_range_parser (const char *string);
/* STRING is the string to be parsed. */
void init (const char *string);
/* While processing a range, this fuction is called iteratively; At
each call it will return the next value in the range.
At the beginning of parsing a range, the char pointer
STATE->m_cur_tok will be advanced past <number1> and left
pointing at the '-' token. Subsequent calls will not advance the
pointer until the range is completed. The call that completes
the range will advance the pointer past <number2>. */
int get_number ();
/* Setup internal state such that get_next() returns numbers in the
START_VALUE to END_VALUE range. END_PTR is where the string is
advanced to when get_next() returns END_VALUE. */
void setup_range (int start_value, int end_value,
const char *end_ptr);
/* Returns true if parsing has completed. */
bool finished () const;
/* Return the string being parsed. When parsing has finished, this
points past the last parsed token. */
const char *cur_tok () const
{ return m_cur_tok; }
/* True when parsing a range. */
bool in_range () const
{ return m_in_range; }
/* When parsing a range, the final value in the range. */
int end_value () const
{ return m_end_value; }
/* When parsing a range, skip past the final token in the range. */
void skip_range ()
{
gdb_assert (m_in_range);
m_cur_tok = m_end_ptr;
m_in_range = false;
}
private:
/* No need for these. They are intentionally not defined anywhere. */
number_or_range_parser (const number_or_range_parser &);
number_or_range_parser &operator= (const number_or_range_parser &);
/* The string being parsed. When parsing has finished, this points
past the last parsed token. */
const char *m_cur_tok;
/* Last value returned. */
int m_last_retval;
/* When parsing a range, the final value in the range. */
int m_end_value;
/* When parsing a range, a pointer past the final token in the
range. */
const char *m_end_ptr;
/* True when parsing a range. */
bool m_in_range;
};
/* Accept a number and a string-form list of numbers such as is
accepted by get_number_or_range. Return TRUE if the number is
in the list.
By definition, an empty list includes all numbers. This is to
be interpreted as typing a command such as "delete break" with
no arguments. */
extern int number_is_in_list (const char *list, int number);
/* Reverse S to the last non-whitespace character without skipping past
START. */
extern const char *remove_trailing_whitespace (const char *start,
const char *s);
/* Same, for non-const S. */
static inline char *
remove_trailing_whitespace (const char *start, char *s)
{
return (char *) remove_trailing_whitespace (start, (const char *) s);
}
/* A helper function to extract an argument from *ARG. An argument is
delimited by whitespace. The return value is empty if no argument
was found. */
extern std::string extract_arg (char **arg);
/* A const-correct version of the above. */
extern std::string extract_arg (const char **arg);
/* A helper function that looks for an argument at the start of a
string. The argument must also either be at the end of the string,
or be followed by whitespace. Returns 1 if it finds the argument,
0 otherwise. If the argument is found, it updates *STR. */
extern int check_for_argument (const char **str, const char *arg, int arg_len);
/* Same, for non-const STR. */
static inline int
check_for_argument (char **str, const char *arg, int arg_len)
{
return check_for_argument (const_cast<const char **> (str),
arg, arg_len);
}
/* A helper function that looks for a set of flags at the start of a
string. The possible flags are given as a null terminated string.
A flag in STR must either be at the end of the string,
or be followed by whitespace.
Returns 0 if no valid flag is found at the start of STR.
Otherwise updates *STR, and returns N (which is > 0),
such that FLAGS [N - 1] is the valid found flag. */
extern int parse_flags (const char **str, const char *flags);
/* qcs_flags struct regroups the flags parsed by parse_flags_qcs. */
struct qcs_flags
{
bool quiet = false;
bool cont = false;
bool silent = false;
};
/* A helper function that uses parse_flags to handle the flags qcs :
A flag -q sets FLAGS->QUIET to true.
A flag -c sets FLAGS->CONT to true.
A flag -s sets FLAGS->SILENT to true.
The caller is responsible to initialize *FLAGS to false before the (first)
call to parse_flags_qcs.
parse_flags_qcs can then be called iteratively to search for more
valid flags, as part of a 'main parsing loop' searching for -q/-c/-s
flags together with other flags and options.
Returns true and updates *STR and one of FLAGS->QUIET, FLAGS->CONT,
FLAGS->SILENT if it finds a valid flag.
Returns false if no valid flag is found at the beginning of STR.
Throws an error if a flag is found such that both FLAGS->CONT and
FLAGS->SILENT are true. */
extern bool parse_flags_qcs (const char *which_command, const char **str,
qcs_flags *flags);
#endif /* CLI_UTILS_H */
|
