aboutsummaryrefslogtreecommitdiffstats
path: root/src/vlib/lex.h
blob: 4ae58f468c125bb7ca12e302f32d84a6daac09f6 (plain)
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
/*
 * Copyright (c) 2015 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef included_vlib_lex_h
#define included_vlib_lex_h

#include <vppinfra/hash.h>
#include <vppinfra/bitmap.h>
#include <vppinfra/error.h>
#include <vppinfra/pool.h>

#define foreach_vlib_lex_global_token           \
  _ (invalid)                                   \
  _ (eof)                                       \
  _ (word)                                      \
  _ (number)                                    \
  _ (lt)                                        \
  _ (gt)                                        \
  _ (dot)                                       \
  _ (slash)                                     \
  _ (qmark)                                     \
  _ (equals)                                    \
  _ (plus)                                      \
  _ (minus)                                     \
  _ (star)                                      \
  _ (lpar)                                      \
  _ (rpar)

typedef enum
{
#define _(f) VLIB_LEX_##f,
  foreach_vlib_lex_global_token
#undef _
} vlib_lex_global_token_t;

typedef enum
{
  VLIB_LEX_IGNORE,
  VLIB_LEX_ADD_TO_TOKEN,
  VLIB_LEX_RETURN,
  VLIB_LEX_RETURN_AND_RESCAN,
  VLIB_LEX_KEYWORD_CHECK,
  VLIB_LEX_START_NUMBER,
  VLIB_LEX_ADD_TO_NUMBER,
} vlib_lex_action_t;

typedef struct
{
  u16 action;
  u16 next_table_index;
  u16 token;
} vlib_lex_table_entry_t;

typedef struct
{
  char *name;
  vlib_lex_table_entry_t entries[128];
} vlib_lex_table_t;

typedef struct
{
  u32 token;

  union
  {
    uword as_uword;
    void *as_pointer;
    char *as_string;
  } value;
} vlib_lex_token_t;

typedef struct
{
  vlib_lex_table_t *lex_tables;
  uword *lex_tables_by_name;

  /* Vector of token strings. */
  char **lex_token_names;

  /* Hash mapping c string name to token index. */
  uword *lex_tokens_by_name;

  /* Hash mapping c string keyword name to token index. */
  uword *lex_keywords;

  vlib_lex_token_t *pushback_vector;

  i32 pushback_sp;

  u32 current_table_index;

  uword current_token_value;

  uword current_number_base;

  /* Input string we are lex-ing. */
  u8 *input_vector;

  /* Current index into input vector. */
  u32 current_index;

  /* Re-used vector for forming token strings and hashing them. */
  u8 *token_buffer;
} vlib_lex_main_t;

vlib_lex_main_t vlib_lex_main;

always_inline void
vlib_lex_cleanup_token (vlib_lex_token_t * t)
{
  if (t->token == VLIB_LEX_word)
    {
      u8 *tv = t->value.as_pointer;
      vec_free (tv);
    }
}

u16 vlib_lex_add_table (char *name);
void vlib_lex_get_token (vlib_lex_main_t * lm, vlib_lex_token_t * result);
u16 vlib_lex_add_token (vlib_lex_main_t * lm, char *token_name);
void vlib_lex_set_action_range (u32 table_index, u8 lo, u8 hi, u16 action,
				u16 token, u32 next_table_index);
void vlib_lex_reset (vlib_lex_main_t * lm, u8 * input_vector);
format_function_t format_vlib_lex_token;

#endif /* included_vlib_lex_h */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */