1 /*
2 * SysDB - src/include/parser/ast.h
3 * Copyright (C) 2013-2015 Sebastian 'tokkee' Harl <sh@tokkee.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
17 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
28 /*
29 * The SysDB query language AST describes the parse-tree of an SysQL query.
30 */
32 #ifndef SDB_PARSER_AST_H
33 #define SDB_PARSER_AST_H 1
35 #include "core/data.h"
36 #include "core/time.h"
37 #include "core/object.h"
39 #include <assert.h>
41 #ifdef __cplusplus
42 extern "C" {
43 #endif
45 /*
46 * sdb_ast_node_type_t describes the type of an AST node.
47 */
48 typedef enum {
49 /* command nodes */
50 SDB_AST_TYPE_FETCH = 1,
51 SDB_AST_TYPE_LIST = 2,
52 SDB_AST_TYPE_LOOKUP = 3,
53 SDB_AST_TYPE_STORE = 4,
54 SDB_AST_TYPE_TIMESERIES = 5,
56 /* generic expressions */
57 SDB_AST_TYPE_OPERATOR = 100,
58 SDB_AST_TYPE_ITERATOR = 101,
60 /* values */
61 SDB_AST_TYPE_CONST = 200,
62 SDB_AST_TYPE_VALUE = 201,
64 SDB_AST_TYPE_TYPED = 210,
65 } sdb_ast_node_type_t;
67 /*
68 * sdb_ast_operator_t describes the type of an operator.
69 */
70 typedef enum {
71 /* logical and comparison operators */
72 #define SDB_AST_IS_LOGICAL(n) \
73 ((((n)->type == SDB_AST_TYPE_OPERATOR) \
74 && ((SDB_AST_AND <= SDB_AST_OP(n)->kind) \
75 && (SDB_AST_OP(n)->kind <= SDB_AST_IN))) \
76 || (((n)->type == SDB_AST_TYPE_ITERATOR) \
77 && ((SDB_AST_ALL <= SDB_AST_ITER(n)->kind) \
78 && (SDB_AST_ITER(n)->kind <= SDB_AST_ANY))))
79 SDB_AST_AND = 1000,
80 SDB_AST_OR = 1001,
81 SDB_AST_NOT = 1002,
83 SDB_AST_LT = 1010,
84 SDB_AST_LE = 1011,
85 SDB_AST_EQ = 1012,
86 SDB_AST_NE = 1013,
87 SDB_AST_GE = 1014,
88 SDB_AST_GT = 1015,
89 SDB_AST_REGEX = 1016,
90 SDB_AST_NREGEX = 1017,
91 SDB_AST_ISNULL = 1018,
92 SDB_AST_IN = 1019,
94 /* arithmetic expressions */
95 #define SDB_AST_IS_ARITHMETIC(n) \
96 (((n)->type == SDB_AST_TYPE_CONST) \
97 || ((n)->type == SDB_AST_TYPE_VALUE) \
98 || ((n)->type == SDB_AST_TYPE_TYPED) \
99 || (((n)->type == SDB_AST_TYPE_OPERATOR) \
100 && ((SDB_AST_ADD <= SDB_AST_OP(n)->kind) \
101 && (SDB_AST_OP(n)->kind <= SDB_AST_CONCAT))))
102 SDB_AST_ADD = 2000,
103 SDB_AST_SUB = 2001,
104 SDB_AST_MUL = 2002,
105 SDB_AST_DIV = 2003,
106 SDB_AST_MOD = 2004,
107 SDB_AST_CONCAT = 2005,
109 /* iterators */
110 #define SDB_AST_IS_ITERATOR(n) \
111 (((n)->type == SDB_AST_TYPE_ITERATOR) \
112 && ((SDB_AST_ALL <= SDB_AST_ITER(n)->kind) \
113 && (SDB_AST_ITER(n)->kind <= SDB_AST_ANY)))
114 SDB_AST_ALL = 3000,
115 SDB_AST_ANY = 3001,
116 } sdb_ast_operator_t;
118 #define SDB_AST_OP_TO_STRING(op) \
119 (((op) == SDB_AST_AND) ? "AND" \
120 : ((op) == SDB_AST_OR) ? "OR" \
121 : ((op) == SDB_AST_NOT) ? "NOT" \
122 : ((op) == SDB_AST_LT) ? "LT" \
123 : ((op) == SDB_AST_LE) ? "LE" \
124 : ((op) == SDB_AST_EQ) ? "EQ" \
125 : ((op) == SDB_AST_NE) ? "NE" \
126 : ((op) == SDB_AST_GE) ? "GE" \
127 : ((op) == SDB_AST_GT) ? "GT" \
128 : ((op) == SDB_AST_REGEX) ? "REGEX" \
129 : ((op) == SDB_AST_NREGEX) ? "NREGEX" \
130 : ((op) == SDB_AST_ISNULL) ? "ISNULL" \
131 : ((op) == SDB_AST_IN) ? "IN" \
132 : ((op) == SDB_AST_ADD) ? "ADD" \
133 : ((op) == SDB_AST_SUB) ? "SUB" \
134 : ((op) == SDB_AST_MUL) ? "MUL" \
135 : ((op) == SDB_AST_DIV) ? "DIV" \
136 : ((op) == SDB_AST_MOD) ? "MOD" \
137 : ((op) == SDB_AST_CONCAT) ? "CONCAT" \
138 : ((op) == SDB_AST_ALL) ? "ALL" \
139 : ((op) == SDB_AST_ANY) ? "ANY" \
140 : "UNKNOWN")
142 #define SDB_AST_TYPE_TO_STRING(n) \
143 (((n)->type == SDB_AST_TYPE_FETCH) ? "FETCH" \
144 : ((n)->type == SDB_AST_TYPE_LIST) ? "LIST" \
145 : ((n)->type == SDB_AST_TYPE_LOOKUP) ? "LOOKUP" \
146 : ((n)->type == SDB_AST_TYPE_STORE) ? "STORE" \
147 : ((n)->type == SDB_AST_TYPE_TIMESERIES) ? "TIMESERIES" \
148 : ((n)->type == SDB_AST_TYPE_OPERATOR) \
149 ? SDB_AST_OP_TO_STRING(SDB_AST_OP(n)->kind) \
150 : ((n)->type == SDB_AST_TYPE_ITERATOR) ? "ITERATOR" \
151 : ((n)->type == SDB_AST_TYPE_CONST) ? "CONSTANT" \
152 : ((n)->type == SDB_AST_TYPE_VALUE) ? "VALUE" \
153 : ((n)->type == SDB_AST_TYPE_TYPED) ? "TYPED VALUE" \
154 : "UNKNOWN")
156 /*
157 * sdb_ast_node_t is the interface for AST nodes. The first field of any
158 * actual implementation of the interface is of type sdb_ast_node_t to
159 * fascilitate casting between the interface and implementation types.
160 *
161 * It inherits from sdb_object_t and instances may safely be cast to a generic
162 * object as well.
163 */
164 typedef struct {
165 sdb_object_t super;
167 /* type describes the type of the actual node */
168 int type;
169 } sdb_ast_node_t;
170 #define SDB_AST_NODE(obj) ((sdb_ast_node_t *)(obj))
172 /*
173 * sdb_ast_op_t represents a simple operation.
174 */
175 typedef struct {
176 sdb_ast_node_t super;
177 int kind;
178 /* left operand is NULL for unary expressions */
179 sdb_ast_node_t *left;
180 sdb_ast_node_t *right;
181 } sdb_ast_op_t;
182 #define SDB_AST_OP(obj) ((sdb_ast_op_t *)(obj))
183 #define SDB_AST_OP_INIT \
184 { { SDB_OBJECT_INIT, SDB_AST_TYPE_OPERATOR }, -1, NULL, NULL }
186 /*
187 * sdb_ast_iter_t represents an iterator.
188 */
189 typedef struct {
190 sdb_ast_node_t super;
191 int kind;
192 sdb_ast_node_t *iter;
193 /* exactly one operand of the expression has to be unset and will be
194 * filled in by the iterator value */
195 sdb_ast_node_t *expr;
196 } sdb_ast_iter_t;
197 #define SDB_AST_ITER(obj) ((sdb_ast_iter_t *)(obj))
198 #define SDB_AST_ITER_INIT \
199 { { SDB_OBJECT_INIT, SDB_AST_TYPE_ITERATOR }, -1, NULL, NULL }
201 /*
202 * sdb_ast_typed_t represents a typed value.
203 */
204 typedef struct {
205 sdb_ast_node_t super;
206 int type;
207 sdb_ast_node_t *expr;
208 } sdb_ast_typed_t;
209 #define SDB_AST_TYPED(obj) ((sdb_ast_typed_t *)(obj))
210 #define SDB_AST_TYPED_INIT \
211 { { SDB_OBJECT_INIT, SDB_AST_TYPE_TYPED }, -1, NULL }
213 /*
214 * sdb_ast_const_t represents a constant value.
215 */
216 typedef struct {
217 sdb_ast_node_t super;
218 sdb_data_t value;
219 } sdb_ast_const_t;
220 #define SDB_AST_CONST(obj) ((sdb_ast_const_t *)(obj))
221 #define SDB_AST_CONST_INIT \
222 { { SDB_OBJECT_INIT, SDB_AST_TYPE_CONST }, SDB_DATA_INIT }
224 /*
225 * sdb_ast_value_t represents an object-specific value: sibling nodes,
226 * attributes, or field values.
227 */
228 typedef struct {
229 sdb_ast_node_t super;
230 int type; /* attribute or field */
231 char *name; /* object name; optional */
232 } sdb_ast_value_t;
233 #define SDB_AST_VALUE(obj) ((sdb_ast_value_t *)(obj))
234 #define SDB_AST_VALUE_INIT \
235 { { SDB_OBJECT_INIT, SDB_AST_TYPE_VALUE }, -1, NULL }
237 /*
238 * sdb_ast_fetch_t represents a FETCH command.
239 */
240 typedef struct {
241 sdb_ast_node_t super;
242 int obj_type;
243 char *hostname; /* optional */
244 char *name;
245 sdb_ast_node_t *filter; /* optional */
246 } sdb_ast_fetch_t;
247 #define SDB_AST_FETCH(obj) ((sdb_ast_fetch_t *)(obj))
248 #define SDB_AST_FETCH_INIT \
249 { { SDB_OBJECT_INIT, SDB_AST_TYPE_FETCH }, -1, NULL, NULL, NULL }
251 /*
252 * sdb_ast_list_t represents a LIST command.
253 */
254 typedef struct {
255 sdb_ast_node_t super;
256 int obj_type;
257 sdb_ast_node_t *filter; /* optional */
258 } sdb_ast_list_t;
259 #define SDB_AST_LIST(obj) ((sdb_ast_list_t *)(obj))
260 #define SDB_AST_LIST_INIT \
261 { { SDB_OBJECT_INIT, SDB_AST_TYPE_LIST }, -1, NULL }
263 /*
264 * sdb_ast_lookup_t represents a LOOKUP command.
265 */
266 typedef struct {
267 sdb_ast_node_t super;
268 int obj_type;
269 sdb_ast_node_t *matcher; /* optional */
270 sdb_ast_node_t *filter; /* optional */
271 } sdb_ast_lookup_t;
272 #define SDB_AST_LOOKUP(obj) ((sdb_ast_lookup_t *)(obj))
273 #define SDB_AST_LOOKUP_INIT \
274 { { SDB_OBJECT_INIT, SDB_AST_TYPE_LOOKUP }, -1, NULL, NULL }
276 /*
277 * sdb_ast_store_t represents a STORE command.
278 */
279 typedef struct {
280 sdb_ast_node_t super;
281 int obj_type;
282 char *hostname; /* optional */
283 int parent_type; /* optional */
284 char *parent; /* optional */
285 char *name;
286 sdb_time_t last_update;
288 /* metric specific */
289 char *store_type;
290 char *store_id;
292 /* attribute specific */
293 sdb_data_t value;
294 } sdb_ast_store_t;
295 #define SDB_AST_STORE(obj) ((sdb_ast_store_t *)(obj))
296 #define SDB_AST_STORE_INIT \
297 { { SDB_OBJECT_INIT, SDB_AST_TYPE_STORE }, \
298 -1, NULL, -1, NULL, NULL, 0, NULL, NULL, SDB_DATA_INIT }
300 /*
301 * sdb_ast_timeseries_t represents a TIMESERIES command.
302 */
303 typedef struct {
304 sdb_ast_node_t super;
305 char *hostname;
306 char *metric;
307 sdb_time_t start;
308 sdb_time_t end;
309 } sdb_ast_timeseries_t;
310 #define SDB_AST_TIMESERIES(obj) ((sdb_ast_timeseries_t *)(obj))
311 #define SDB_AST_TIMESERIES_INIT \
312 { { SDB_OBJECT_INIT, SDB_AST_TYPE_TIMESERIES }, NULL, NULL, 0, 0 }
314 /*
315 * AST constructors:
316 * Newly created nodes take ownership of any dynamically allocated objects
317 * (node objects, dynamically allocated constant values, strings). The memory
318 * will be freed when destroying the node using sdb_object_deref.
319 *
320 * The constructors do not verify any arguments. The analyzer has to be used
321 * for that purpose.
322 */
324 /*
325 * sdb_ast_op_create:
326 * Creates an AST node representing a simple (ary or unary) operation. The
327 * newly created node takes ownership of the left and right nodes.
328 */
329 sdb_ast_node_t *
330 sdb_ast_op_create(int kind, sdb_ast_node_t *left, sdb_ast_node_t *right);
332 /*
333 * sdb_ast_iter_create:
334 * Creates an AST node representing an iterator. The newly created node takes
335 * ownership of the iter and expr nodes.
336 */
337 sdb_ast_node_t *
338 sdb_ast_iter_create(int kind, sdb_ast_node_t *iter, sdb_ast_node_t *expr);
340 /*
341 * sdb_ast_typed_create:
342 * Creates an AST node representing a typed expression. Thew newly created
343 * node takes ownership of the expr node.
344 */
345 sdb_ast_node_t *
346 sdb_ast_typed_create(int type, sdb_ast_node_t *expr);
348 /*
349 * sdb_ast_const_create:
350 * Creates an AST node representing a constant value. The newly created node
351 * takes ownership of the value object.
352 */
353 sdb_ast_node_t *
354 sdb_ast_const_create(sdb_data_t value);
356 /*
357 * sdb_ast_value_create:
358 * Creates an AST node representing an object-specific value (sibling nodes,
359 * attributes, or field values). The newly created node takes ownership of the
360 * string value.
361 */
362 sdb_ast_node_t *
363 sdb_ast_value_create(int type, char *name);
365 /*
366 * sdb_ast_fetch_create:
367 * Creates an AST node representing a FETCH command. The newly created node
368 * takes ownership of the strings and the filter node.
369 */
370 sdb_ast_node_t *
371 sdb_ast_fetch_create(int obj_type, char *hostname, char *name,
372 sdb_ast_node_t *filter);
374 /*
375 * sdb_ast_list_create:
376 * Creates an AST node representing a LIST command. The newly created node
377 * takes ownership of the filter node.
378 */
379 sdb_ast_node_t *
380 sdb_ast_list_create(int obj_type, sdb_ast_node_t *filter);
382 /*
383 * sdb_ast_lookup_create:
384 * Creates an AST node representing a LOOKUP command. The newly created node
385 * takes ownership of the matcher and filter nodes.
386 */
387 sdb_ast_node_t *
388 sdb_ast_lookup_create(int obj_type, sdb_ast_node_t *matcher,
389 sdb_ast_node_t *filter);
391 /*
392 * sdb_ast_store_create:
393 * Creates an AST node representing a STORE command. Thew newly created node
394 * takes ownership of all strings and the value object.
395 */
396 sdb_ast_node_t *
397 sdb_ast_store_create(int obj_type, char *hostname,
398 int parent_type, char *parent, char *name, sdb_time_t last_update,
399 char *store_type, char *store_id, sdb_data_t value);
401 /*
402 * sdb_ast_timeseries_create:
403 * Creates an AST node representing a TIMESERIES command. The newly created
404 * node takes ownership of the strings.
405 */
406 sdb_ast_node_t *
407 sdb_ast_timeseries_create(char *hostname, char *metric,
408 sdb_time_t start, sdb_time_t end);
410 #ifdef __cplusplus
411 } /* extern "C" */
412 #endif
414 #endif /* ! SDB_PARSER_AST_H */
416 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */