aboutsummaryrefslogtreecommitdiff
path: root/src/tree_sitter/parser.h
blob: 799f599bd4e292e95565f90733c59fa422899eae (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
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
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
#ifndef TREE_SITTER_PARSER_H_
#define TREE_SITTER_PARSER_H_

#ifdef __cplusplus
extern "C" {
#endif

#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>

#define ts_builtin_sym_error ((TSSymbol)-1)
#define ts_builtin_sym_end 0
#define TREE_SITTER_SERIALIZATION_BUFFER_SIZE 1024

#ifndef TREE_SITTER_API_H_
typedef uint16_t TSStateId;
typedef uint16_t TSSymbol;
typedef uint16_t TSFieldId;
typedef struct TSLanguage TSLanguage;
#endif

typedef struct {
  TSFieldId field_id;
  uint8_t child_index;
  bool inherited;
} TSFieldMapEntry;

typedef struct {
  uint16_t index;
  uint16_t length;
} TSFieldMapSlice;

typedef struct {
  bool visible;
  bool named;
  bool supertype;
} TSSymbolMetadata;

typedef struct TSLexer TSLexer;

struct TSLexer {
  int32_t lookahead;
  TSSymbol result_symbol;
  void (*advance)(TSLexer *, bool);
  void (*mark_end)(TSLexer *);
  uint32_t (*get_column)(TSLexer *);
  bool (*is_at_included_range_start)(const TSLexer *);
  bool (*eof)(const TSLexer *);
  void (*log)(const TSLexer *, const char *, ...);
};

typedef enum {
  TSParseActionTypeShift,
  TSParseActionTypeReduce,
  TSParseActionTypeAccept,
  TSParseActionTypeRecover,
} TSParseActionType;

typedef union {
  struct {
    uint8_t type;
    TSStateId state;
    bool extra;
    bool repetition;
  } shift;
  struct {
    uint8_t type;
    uint8_t child_count;
    TSSymbol symbol;
    int16_t dynamic_precedence;
    uint16_t production_id;
  } reduce;
  uint8_t type;
} TSParseAction;

typedef struct {
  uint16_t lex_state;
  uint16_t external_lex_state;
} TSLexMode;

typedef union {
  TSParseAction action;
  struct {
    uint8_t count;
    bool reusable;
  } entry;
} TSParseActionEntry;

typedef struct {
  int32_t start;
  int32_t end;
} TSCharacterRange;

struct TSLanguage {
  uint32_t version;
  uint32_t symbol_count;
  uint32_t alias_count;
  uint32_t token_count;
  uint32_t external_token_count;
  uint32_t state_count;
  uint32_t large_state_count;
  uint32_t production_id_count;
  uint32_t field_count;
  uint16_t max_alias_sequence_length;
  const uint16_t *parse_table;
  const uint16_t *small_parse_table;
  const uint32_t *small_parse_table_map;
  const TSParseActionEntry *parse_actions;
  const char * const *symbol_names;
  const char * const *field_names;
  const TSFieldMapSlice *field_map_slices;
  const TSFieldMapEntry *field_map_entries;
  const TSSymbolMetadata *symbol_metadata;
  const TSSymbol *public_symbol_map;
  const uint16_t *alias_map;
  const TSSymbol *alias_sequences;
  const TSLexMode *lex_modes;
  bool (*lex_fn)(TSLexer *, TSStateId);
  bool (*keyword_lex_fn)(TSLexer *, TSStateId);
  TSSymbol keyword_capture_token;
  struct {
    const bool *states;
    const TSSymbol *symbol_map;
    void *(*create)(void);
    void (*destroy)(void *);
    bool (*scan)(void *, TSLexer *, const bool *symbol_whitelist);
    unsigned (*serialize)(void *, char *);
    void (*deserialize)(void *, const char *, unsigned);
  } external_scanner;
  const TSStateId *primary_state_ids;
};

static inline bool set_contains(TSCharacterRange *ranges, uint32_t len, int32_t lookahead) {
  uint32_t index = 0;
  uint32_t size = len - index;
  while (size > 1) {
    uint32_t half_size = size / 2;
    uint32_t mid_index = index + half_size;
    TSCharacterRange *range = &ranges[mid_index];
    if (lookahead >= range->start && lookahead <= range->end) {
      return true;
    } else if (lookahead > range->end) {
      index = mid_index;
    }
    size -= half_size;
  }
  TSCharacterRange *range = &ranges[index];
  return (lookahead >= range->start && lookahead <= range->end);
}

/*
 *  Lexer Macros
 */

#ifdef _MSC_VER
#define UNUSED __pragma(warning(suppress : 4101))
#else
#define UNUSED __attribute__((unused))
#endif

#define START_LEXER()           \
  bool result = false;          \
  bool skip = false;            \
  UNUSED                        \
  bool eof = false;             \
  int32_t lookahead;            \
  goto start;                   \
  next_state:                   \
  lexer->advance(lexer, skip);  \
  start:                        \
  skip = false;                 \
  lookahead = lexer->lookahead;

#define ADVANCE(state_value) \
  {                          \
    state = state_value;     \
    goto next_state;         \
  }

#define ADVANCE_MAP(...)                                              \
  {                                                                   \
    static const uint16_t map[] = { __VA_ARGS__ };                    \
    for (uint32_t i = 0; i < sizeof(map) / sizeof(map[0]); i += 2) {  \
      if (map[i] == lookahead) {                                      \
        state = map[i + 1];                                           \
        goto next_state;                                              \
      }                                                               \
    }                                                                 \
  }

#define SKIP(state_value) \
  {                       \
    skip = true;          \
    state = state_value;  \
    goto next_state;      \
  }

#define ACCEPT_TOKEN(symbol_value)     \
  result = true;                       \
  lexer->result_symbol = symbol_value; \
  lexer->mark_end(lexer);

#define END_STATE() return result;

/*
 *  Parse Table Macros
 */

#define SMALL_STATE(id) ((id) - LARGE_STATE_COUNT)

#define STATE(id) id

#define ACTIONS(id) id

#define SHIFT(state_value)            \
  {{                                  \
    .shift = {                        \
      .type = TSParseActionTypeShift, \
      .state = (state_value)          \
    }                                 \
  }}

#define SHIFT_REPEAT(state_value)     \
  {{                                  \
    .shift = {                        \
      .type = TSParseActionTypeShift, \
      .state = (state_value),         \
      .repetition = true              \
    }                                 \
  }}

#define SHIFT_EXTRA()                 \
  {{                                  \
    .shift = {                        \
      .type = TSParseActionTypeShift, \
      .extra = true                   \
    }                                 \
  }}

#define REDUCE(symbol_name, children, precedence, prod_id) \
  {{                                                       \
    .reduce = {                                            \
      .type = TSParseActionTypeReduce,                     \
      .symbol = symbol_name,                               \
      .child_count = children,                             \
      .dynamic_precedence = precedence,                    \
      .production_id = prod_id                             \
    },                                                     \
  }}

#define RECOVER()                    \
  {{                                 \
    .type = TSParseActionTypeRecover \
  }}

#define ACCEPT_INPUT()              \
  {{                                \
    .type = TSParseActionTypeAccept \
  }}

#ifdef __cplusplus
}
#endif

#endif  // TREE_SITTER_PARSER_H_