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e9cafbcc TT |
1 | /* CLI utilities. |
2 | ||
e2882c85 | 3 | Copyright (C) 2011-2018 Free Software Foundation, Inc. |
e9cafbcc TT |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #ifndef CLI_UTILS_H | |
21 | #define CLI_UTILS_H | |
22 | ||
5d5658a1 PA |
23 | /* *PP is a string denoting a number. Get the number. Advance *PP |
24 | after the string and any trailing whitespace. | |
e9cafbcc | 25 | |
5d5658a1 PA |
26 | The string can either be a number, or "$" followed by the name of a |
27 | convenience variable, or ("$" or "$$") followed by digits. | |
28 | ||
29 | TRAILER is a character which can be found after the number; most | |
30 | commonly this is `-'. If you don't want a trailer, use \0. */ | |
31 | ||
32 | extern int get_number_trailer (const char **pp, int trailer); | |
33 | ||
34 | /* Convenience. Like get_number_trailer, but with no TRAILER. */ | |
e9cafbcc | 35 | |
f1735a53 | 36 | extern int get_number (const char **); |
e799154c | 37 | |
f1735a53 | 38 | /* Like the above, but takes a non-const "char **". */ |
e799154c | 39 | |
e9cafbcc TT |
40 | extern int get_number (char **); |
41 | ||
bfd28288 PA |
42 | /* Parse a number or a range. |
43 | A number will be of the form handled by get_number. | |
44 | A range will be of the form <number1> - <number2>, and | |
45 | will represent all the integers between number1 and number2, | |
46 | inclusive. */ | |
197f0a60 | 47 | |
bfd28288 | 48 | class number_or_range_parser |
197f0a60 | 49 | { |
bfd28288 PA |
50 | public: |
51 | /* Default construction. Must call init before calling | |
52 | get_next. */ | |
53 | number_or_range_parser () {} | |
54 | ||
55 | /* Calls init automatically. */ | |
56 | number_or_range_parser (const char *string); | |
57 | ||
58 | /* STRING is the string to be parsed. */ | |
59 | void init (const char *string); | |
60 | ||
61 | /* While processing a range, this fuction is called iteratively; At | |
62 | each call it will return the next value in the range. | |
63 | ||
64 | At the beginning of parsing a range, the char pointer | |
65 | STATE->m_cur_tok will be advanced past <number1> and left | |
66 | pointing at the '-' token. Subsequent calls will not advance the | |
67 | pointer until the range is completed. The call that completes | |
68 | the range will advance the pointer past <number2>. */ | |
69 | int get_number (); | |
70 | ||
71 | /* Setup internal state such that get_next() returns numbers in the | |
72 | START_VALUE to END_VALUE range. END_PTR is where the string is | |
73 | advanced to when get_next() returns END_VALUE. */ | |
74 | void setup_range (int start_value, int end_value, | |
75 | const char *end_ptr); | |
76 | ||
77 | /* Returns true if parsing has completed. */ | |
529c08b2 | 78 | bool finished () const; |
bfd28288 PA |
79 | |
80 | /* Return the string being parsed. When parsing has finished, this | |
81 | points past the last parsed token. */ | |
82 | const char *cur_tok () const | |
83 | { return m_cur_tok; } | |
84 | ||
85 | /* True when parsing a range. */ | |
86 | bool in_range () const | |
87 | { return m_in_range; } | |
88 | ||
89 | /* When parsing a range, the final value in the range. */ | |
90 | int end_value () const | |
91 | { return m_end_value; } | |
92 | ||
93 | /* When parsing a range, skip past the final token in the range. */ | |
94 | void skip_range () | |
95 | { | |
96 | gdb_assert (m_in_range); | |
97 | m_cur_tok = m_end_ptr; | |
529c08b2 | 98 | m_in_range = false; |
bfd28288 PA |
99 | } |
100 | ||
101 | private: | |
102 | /* No need for these. They are intentionally not defined anywhere. */ | |
103 | number_or_range_parser (const number_or_range_parser &); | |
104 | number_or_range_parser &operator= (const number_or_range_parser &); | |
105 | ||
197f0a60 TT |
106 | /* The string being parsed. When parsing has finished, this points |
107 | past the last parsed token. */ | |
bfd28288 | 108 | const char *m_cur_tok; |
197f0a60 TT |
109 | |
110 | /* Last value returned. */ | |
bfd28288 | 111 | int m_last_retval; |
197f0a60 TT |
112 | |
113 | /* When parsing a range, the final value in the range. */ | |
bfd28288 | 114 | int m_end_value; |
197f0a60 TT |
115 | |
116 | /* When parsing a range, a pointer past the final token in the | |
117 | range. */ | |
bfd28288 | 118 | const char *m_end_ptr; |
197f0a60 | 119 | |
bfd28288 PA |
120 | /* True when parsing a range. */ |
121 | bool m_in_range; | |
197f0a60 TT |
122 | }; |
123 | ||
aea5b279 MS |
124 | /* Accept a number and a string-form list of numbers such as is |
125 | accepted by get_number_or_range. Return TRUE if the number is | |
126 | in the list. | |
127 | ||
128 | By definition, an empty list includes all numbers. This is to | |
129 | be interpreted as typing a command such as "delete break" with | |
130 | no arguments. */ | |
131 | ||
e799154c | 132 | extern int number_is_in_list (const char *list, int number); |
aea5b279 | 133 | |
c00f8484 KS |
134 | /* Reverse S to the last non-whitespace character without skipping past |
135 | START. */ | |
136 | ||
63160a43 PA |
137 | extern const char *remove_trailing_whitespace (const char *start, |
138 | const char *s); | |
139 | ||
140 | /* Same, for non-const S. */ | |
141 | ||
142 | static inline char * | |
143 | remove_trailing_whitespace (const char *start, char *s) | |
144 | { | |
145 | return (char *) remove_trailing_whitespace (start, (const char *) s); | |
146 | } | |
55aa24fb SDJ |
147 | |
148 | /* A helper function to extract an argument from *ARG. An argument is | |
cb791d59 TT |
149 | delimited by whitespace. The return value is empty if no argument |
150 | was found. */ | |
55aa24fb | 151 | |
cb791d59 | 152 | extern std::string extract_arg (char **arg); |
55aa24fb | 153 | |
cb791d59 | 154 | /* A const-correct version of the above. */ |
b5be8ce0 | 155 | |
cb791d59 | 156 | extern std::string extract_arg (const char **arg); |
b5be8ce0 | 157 | |
e6f0bce7 HZ |
158 | /* A helper function that looks for an argument at the start of a |
159 | string. The argument must also either be at the end of the string, | |
160 | or be followed by whitespace. Returns 1 if it finds the argument, | |
161 | 0 otherwise. If the argument is found, it updates *STR. */ | |
63160a43 PA |
162 | extern int check_for_argument (const char **str, const char *arg, int arg_len); |
163 | ||
164 | /* Same, for non-const STR. */ | |
165 | ||
166 | static inline int | |
167 | check_for_argument (char **str, const char *arg, int arg_len) | |
168 | { | |
169 | return check_for_argument (const_cast<const char **> (str), | |
170 | arg, arg_len); | |
171 | } | |
e6f0bce7 | 172 | |
529c08b2 PW |
173 | /* A helper function that looks for a set of flags at the start of a |
174 | string. The possible flags are given as a null terminated string. | |
175 | A flag in STR must either be at the end of the string, | |
176 | or be followed by whitespace. | |
177 | Returns 0 if no valid flag is found at the start of STR. | |
178 | Otherwise updates *STR, and returns N (which is > 0), | |
179 | such that FLAGS [N - 1] is the valid found flag. */ | |
180 | extern int parse_flags (const char **str, const char *flags); | |
181 | ||
182 | /* qcs_flags struct regroups the flags parsed by parse_flags_qcs. */ | |
183 | ||
184 | struct qcs_flags | |
185 | { | |
186 | bool quiet = false; | |
187 | bool cont = false; | |
188 | bool silent = false; | |
189 | }; | |
190 | ||
191 | /* A helper function that uses parse_flags to handle the flags qcs : | |
192 | A flag -q sets FLAGS->QUIET to true. | |
193 | A flag -c sets FLAGS->CONT to true. | |
194 | A flag -s sets FLAGS->SILENT to true. | |
195 | ||
196 | The caller is responsible to initialize *FLAGS to false before the (first) | |
197 | call to parse_flags_qcs. | |
198 | parse_flags_qcs can then be called iteratively to search for more | |
199 | valid flags, as part of a 'main parsing loop' searching for -q/-c/-s | |
200 | flags together with other flags and options. | |
201 | ||
202 | Returns true and updates *STR and one of FLAGS->QUIET, FLAGS->CONT, | |
203 | FLAGS->SILENT if it finds a valid flag. | |
204 | Returns false if no valid flag is found at the beginning of STR. | |
205 | ||
206 | Throws an error if a flag is found such that both FLAGS->CONT and | |
207 | FLAGS->SILENT are true. */ | |
208 | ||
209 | extern bool parse_flags_qcs (const char *which_command, const char **str, | |
210 | qcs_flags *flags); | |
e9cafbcc | 211 | #endif /* CLI_UTILS_H */ |