4f09c3730be73cb4e01a4af554f147fd31eaf9e3
1 /*
2 * SysDB - src/frontend/scanner.l
3 * Copyright (C) 2013 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 %{
30 #if HAVE_CONFIG_H
31 # include "config.h"
32 #endif /* HAVE_CONFIG_H */
34 #include "core/data.h"
35 #include "frontend/connection.h"
36 #include "frontend/parser.h"
37 #include "frontend/grammar.h"
38 #include "utils/error.h"
40 #include <assert.h>
41 #include <errno.h>
43 #include <string.h>
44 #include <stdlib.h>
46 #include <time.h>
48 #define YY_EXTRA_TYPE sdb_fe_yyextra_t *
50 static struct {
51 const char *name;
52 int id;
53 } reserved_words[] = {
54 { "AND", AND },
55 { "ANY", ANY },
56 { "END", END },
57 { "FETCH", FETCH },
58 { "FILTER", FILTER },
59 { "IN", IN },
60 { "IS", IS },
61 { "LIST", LIST },
62 { "LOOKUP", LOOKUP },
63 { "MATCHING", MATCHING },
64 { "NOT", NOT },
65 { "NULL", NULL_T },
66 { "OR", OR },
67 { "START", START },
68 { "TIMESERIES", TIMESERIES },
69 };
71 void
72 sdb_fe_yyerror(YYLTYPE *lval, sdb_fe_yyscan_t scanner, const char *msg);
74 %}
76 %option never-interactive
77 %option reentrant
78 %option bison-bridge
79 %option bison-locations
80 %option 8bit
81 %option yylineno
82 %option nodefault
83 %option noinput
84 %option nounput
85 %option noyywrap
86 %option verbose
87 %option warn
88 %option prefix="sdb_fe_yy" outfile="lex.yy.c"
90 %x CSC
92 whitespace ([ \t\n\r\f]+)
93 simple_comment ("--"[^\n\r]*)
95 /*
96 * C style comments
97 */
98 csc_start \/\*
99 csc_inside ([^*/]+|[^*]\/|\*[^/])
100 csc_end \*\/
102 /*
103 * Strings and identifiers.
104 */
105 identifier ([A-Za-z_][A-Za-z_0-9$]*)
106 /* TODO: fully support SQL strings */
107 string ('([^']|'')*')
109 /*
110 * Numeric constants.
111 */
112 dec ([\+\-]?[0-9]+)
113 exp ([\+\-]?[0-9]+[Ee]\+?[0-9]+)
114 integer ({dec}|{exp})
115 float1 ([\+\-]?[0-9]+\.[0-9]*([Ee][\+\-]?[0-9]+)?)
116 float2 ([\+\-]?[0-9]*\.[0-9]+([Ee][\+\-]?[0-9]+)?)
117 float3 ([\+\-]?[0-9]+[Ee]\-[0-9]+)
118 float4 ([\+\-]?[Ii][Nn][Ff]([Ii][Nn][Ii][Tt][Yy])?)
119 float5 ([Nn][Aa][Nn])
120 float ({float1}|{float2}|{float3}|{float4}|{float5})
122 /*
123 * Time constants.
124 */
125 date ([0-9]{4}-[0-9]{2}-[0-9]{2})
126 time ([0-9]{1,2}:[0-9]{1,2}(:[0-9]{1,2}(\.[0-9]{1,9})?)?)
128 %%
130 {whitespace} |
131 {simple_comment} { /* ignore */ }
133 {csc_start} { BEGIN(CSC); }
134 <CSC>{csc_inside} { /* ignore */ }
135 <CSC>{csc_end} { BEGIN(INITIAL); }
136 <CSC><<EOF>> {
137 sdb_fe_yyerror(yylloc, yyscanner, "unterminated C-style comment");
138 return SCANNER_ERROR;
139 }
141 {identifier} {
142 size_t i;
143 for (i = 0; i < SDB_STATIC_ARRAY_LEN(reserved_words); ++i)
144 if (! strcasecmp(reserved_words[i].name, yytext))
145 return reserved_words[i].id;
147 yylval->str = strdup(yytext);
148 return IDENTIFIER;
149 }
150 {string} {
151 char *quot;
152 size_t len;
154 /* remove the leading and trailing quote */
155 yytext[yyleng - 1] = '\0';
156 yylval->str = strdup(yytext + 1);
158 quot = yylval->str;
159 len = yyleng - 2;
160 while ((quot = strstr(quot, "''")) != NULL) {
161 memmove(quot, quot + 1, len - (quot - yylval->str) - 1);
162 yylval->str[len - 1] = '\0';
163 --len;
164 ++quot;
165 }
166 return STRING;
167 }
168 {integer} {
169 yylval->data.data.integer = (int64_t)strtoll(yytext, NULL, 10);
170 yylval->data.type = SDB_TYPE_INTEGER;
171 return INTEGER;
172 }
173 {float} {
174 yylval->data.data.decimal = strtod(yytext, NULL);
175 yylval->data.type = SDB_TYPE_DECIMAL;
176 return FLOAT;
177 }
179 {date} {
180 struct tm tm;
181 memset(&tm, 0, sizeof(tm));
182 if (! strptime(yytext, "%Y-%m-%d", &tm)) {
183 char errmsg[1024];
184 snprintf(errmsg, sizeof(errmsg),
185 "Failed to parse '%s' as date", yytext);
186 sdb_fe_yyerror(yylloc, yyscanner, errmsg);
187 return SCANNER_ERROR;
188 }
189 yylval->datetime = SECS_TO_SDB_TIME(mktime(&tm));
190 return DATE;
191 }
192 {time} {
193 struct tm tm;
194 char time[9], ns[10];
195 char *tmp;
197 memset(&tm, 0, sizeof(tm));
198 memset(time, '\0', sizeof(time));
199 memset(ns, '0', sizeof(ns));
200 ns[sizeof(ns) - 1] = '\0';
202 tmp = strchr(yytext, '.');
203 if (tmp) {
204 size_t i;
205 *tmp = '\0';
206 ++tmp;
207 strncpy(ns, tmp, sizeof(ns));
208 for (i = strlen(ns); i < 9; ++i)
209 ns[i] = '0';
210 }
211 strncpy(time, yytext, sizeof(time));
212 if (tmp) {
213 /* reset for better error messages */
214 --tmp;
215 *tmp = '.';
216 }
218 tmp = strchr(time, ':');
219 assert(tmp);
220 tmp = strchr(tmp + 1, ':');
221 if (! tmp)
222 strncat(time, ":00", sizeof(time));
224 if (! strptime(time, "%H:%M:%S", &tm)) {
225 char errmsg[1024];
226 snprintf(errmsg, sizeof(errmsg),
227 "Failed to parse '%s' as time", yytext);
228 sdb_fe_yyerror(yylloc, yyscanner, errmsg);
229 return SCANNER_ERROR;
230 }
232 yylval->datetime = SECS_TO_SDB_TIME(mktime(&tm));
233 yylval->datetime += (sdb_time_t)strtoll(ns, NULL, 10);
234 return TIME;
235 }
237 = { return CMP_EQUAL; }
238 != { return CMP_NEQUAL; }
239 =~ { return CMP_REGEX; }
240 !~ { return CMP_NREGEX; }
241 \< { return CMP_LT; }
242 \<= { return CMP_LE; }
243 \>= { return CMP_GE; }
244 \> { return CMP_GT; }
245 \|\| { return CONCAT; }
247 . { /* XXX: */ return yytext[0]; }
249 %%
251 sdb_fe_yyscan_t
252 sdb_fe_scanner_init(const char *str, int len, sdb_fe_yyextra_t *yyext)
253 {
254 yyscan_t scanner;
256 if (! str)
257 return NULL;
259 if (sdb_fe_yylex_init(&scanner)) {
260 char errbuf[1024];
261 sdb_log(SDB_LOG_ERR, "frontend: yylex_init failed: %s",
262 sdb_strerror(errno, errbuf, sizeof(errbuf)));
263 return NULL;
264 }
266 sdb_fe_yyset_extra(yyext, scanner);
268 if (len < 0)
269 len = strlen(str);
271 /* the newly allocated buffer state (YY_BUFFER_STATE) is stored inside the
272 * scanner and, thus, will be freed by yylex_destroy */
273 sdb_fe_yy_scan_bytes(str, len, scanner);
274 return scanner;
275 } /* sdb_fe_scanner_init */
277 void
278 sdb_fe_scanner_destroy(sdb_fe_yyscan_t scanner)
279 {
280 sdb_fe_yylex_destroy(scanner);
281 } /* sdb_fe_scanner_destroy */
283 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */