src/parser/scanner.l

   1 /*
   2  * SysDB - src/parser/scanner.l
   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  */
  27
  28 %{
  29
  30 #if HAVE_CONFIG_H
  31 #       include "config.h"
  32 #endif /* HAVE_CONFIG_H */
  33
  34 #include "core/data.h"
  35
  36 #include "parser/parser.h"
  37 #include "parser/grammar.h"
  38
  39 #include "utils/error.h"
  40
  41 #include <assert.h>
  42 #include <errno.h>
  43
  44 #include <string.h>
  45 #include <stdlib.h>
  46
  47 #include <time.h>
  48
  49 #define YY_EXTRA_TYPE sdb_parser_yyextra_t *
  50
  51 static struct {
  52         const char *name;
  53         int id;
  54 } reserved_words[] = {
  55         { "ALL",         ALL },
  56         { "AND",         AND },
  57         { "ANY",         ANY },
  58         { "END",         END },
  59         { "FETCH",       FETCH },
  60         { "FILTER",      FILTER },
  61         { "IN",          IN },
  62         { "IS",          IS },
  63         { "LAST",        LAST },
  64         { "LIST",        LIST },
  65         { "LOOKUP",      LOOKUP },
  66         { "MATCHING",    MATCHING },
  67         { "NOT",         NOT },
  68         { "NULL",        NULL_T },
  69         { "OR",          OR },
  70         { "START",       START },
  71         { "STORE",       STORE },
  72         { "TIMESERIES",  TIMESERIES },
  73         { "UPDATE",      UPDATE },
  74
  75         /* object types */
  76         { "host",        HOST_T },
  77         { "hosts",       HOSTS_T },
  78         { "service",     SERVICE_T },
  79         { "services",    SERVICES_T },
  80         { "metric",      METRIC_T },
  81         { "metrics",     METRICS_T },
  82         { "attribute",   ATTRIBUTE_T },
  83         { "attributes",  ATTRIBUTES_T },
  84         /* queryable fields */
  85         { "name",        NAME_T },
  86         { "last_update", LAST_UPDATE_T },
  87         { "age",         AGE_T },
  88         { "interval",    INTERVAL_T },
  89         { "backend",     BACKEND_T },
  90         { "value",       VALUE_T },
  91 };
  92
  93 void
  94 sdb_parser_yyerror(YYLTYPE *lval, sdb_parser_yyscan_t scanner, const char *msg);
  95
  96 %}
  97
  98 %option never-interactive
  99 %option reentrant
 100 %option bison-bridge
 101 %option bison-locations
 102 %option 8bit
 103 %option yylineno
 104 %option nodefault
 105 %option noinput
 106 %option nounput
 107 %option noyywrap
 108 %option verbose
 109 %option warn
 110 %option prefix="sdb_parser_yy" outfile="lex.yy.c"
 111
 112 %x CSC
 113
 114 whitespace              ([ \t\n\r\f]+)
 115 simple_comment  ("--"[^\n\r]*)
 116
 117 /*
 118  * C style comments
 119  */
 120 csc_start       \/\*
 121 csc_inside      ([^*/]+|[^*]\/|\*[^/])
 122 csc_end         \*\/
 123
 124 /*
 125  * Strings and identifiers.
 126  */
 127 identifier      ([A-Za-z_][A-Za-z_0-9$]*)
 128 /* TODO: fully support SQL strings */
 129 string          ('([^']|'')*')
 130
 131 /*
 132  * Numeric constants.
 133  */
 134 dec                     ([\+\-]?[0-9]+)
 135 exp                     ([\+\-]?[0-9]+[Ee]\+?[0-9]+)
 136 integer         ({dec}|{exp})
 137 float1          ([\+\-]?[0-9]+\.[0-9]*([Ee][\+\-]?[0-9]+)?)
 138 float2          ([\+\-]?[0-9]*\.[0-9]+([Ee][\+\-]?[0-9]+)?)
 139 float3          ([\+\-]?[0-9]+[Ee]\-[0-9]+)
 140 float4          ([\+\-]?[Ii][Nn][Ff]([Ii][Nn][Ii][Tt][Yy])?)
 141 float5          ([Nn][Aa][Nn])
 142 float           ({float1}|{float2}|{float3}|{float4}|{float5})
 143
 144 /*
 145  * Time constants.
 146  */
 147 date            ([0-9]{4}-[0-9]{2}-[0-9]{2})
 148 time            ([0-9]{1,2}:[0-9]{1,2}(:[0-9]{1,2}(\.[0-9]{1,9})?)?)
 149
 150 %%
 151
 152 {whitespace} |
 153 {simple_comment}        { /* ignore */ }
 154
 155 {csc_start}                     { BEGIN(CSC); }
 156 <CSC>{csc_inside}       { /* ignore */ }
 157 <CSC>{csc_end}          { BEGIN(INITIAL); }
 158 <CSC><<EOF>> {
 159                 sdb_parser_yyerror(yylloc, yyscanner, "unterminated C-style comment");
 160                 return SCANNER_ERROR;
 161         }
 162
 163 {identifier} {
 164                 size_t i;
 165                 for (i = 0; i < SDB_STATIC_ARRAY_LEN(reserved_words); ++i)
 166                         if (! strcasecmp(reserved_words[i].name, yytext))
 167                                 return reserved_words[i].id;
 168
 169                 yylval->str = strdup(yytext);
 170                 return IDENTIFIER;
 171         }
 172 {string} {
 173                 char *quot;
 174                 size_t len;
 175
 176                 /* remove the leading and trailing quote */
 177                 yytext[yyleng - 1] = '\0';
 178                 yylval->str = strdup(yytext + 1);
 179
 180                 quot = yylval->str;
 181                 len = yyleng - 2;
 182                 while ((quot = strstr(quot, "''")) != NULL) {
 183                         memmove(quot, quot + 1, len - (quot - yylval->str) - 1);
 184                         yylval->str[len - 1] = '\0';
 185                         --len;
 186                         ++quot;
 187                 }
 188                 return STRING;
 189         }
 190 {integer} {
 191                 yylval->data.data.integer = (int64_t)strtoll(yytext, NULL, 10);
 192                 yylval->data.type = SDB_TYPE_INTEGER;
 193                 return INTEGER;
 194         }
 195 {float} {
 196                 yylval->data.data.decimal = strtod(yytext, NULL);
 197                 yylval->data.type = SDB_TYPE_DECIMAL;
 198                 return FLOAT;
 199         }
 200
 201 {date} {
 202                 struct tm tm;
 203                 memset(&tm, 0, sizeof(tm));
 204                 if (! strptime(yytext, "%Y-%m-%d", &tm)) {
 205                         char errmsg[1024];
 206                         snprintf(errmsg, sizeof(errmsg),
 207                                 "Failed to parse '%s' as date", yytext);
 208                         sdb_parser_yyerror(yylloc, yyscanner, errmsg);
 209                         return SCANNER_ERROR;
 210                 }
 211                 yylval->datetime = SECS_TO_SDB_TIME(mktime(&tm));
 212                 return DATE;
 213         }
 214 {time} {
 215                 struct tm tm;
 216                 char time[9], ns[10];
 217                 char *tmp;
 218                 int t;
 219
 220                 memset(&tm, 0, sizeof(tm));
 221                 memset(time, '\0', sizeof(time));
 222                 memset(ns, '0', sizeof(ns));
 223                 ns[sizeof(ns) - 1] = '\0';
 224
 225                 tmp = strchr(yytext, '.');
 226                 if (tmp) {
 227                         size_t i;
 228                         *tmp = '\0';
 229                         ++tmp;
 230                         strncpy(ns, tmp, sizeof(ns));
 231                         for (i = strlen(ns); i < 9; ++i)
 232                                 ns[i] = '0';
 233                 }
 234                 strncpy(time, yytext, sizeof(time));
 235                 if (tmp) {
 236                         /* reset for better error messages */
 237                         --tmp;
 238                         *tmp = '.';
 239                 }
 240
 241                 tmp = strchr(time, ':');
 242                 assert(tmp);
 243                 tmp = strchr(tmp + 1, ':');
 244                 if (! tmp)
 245                         strncat(time, ":00", sizeof(time) - strlen(time) - 1);
 246
 247                 if (! strptime(time, "%H:%M:%S", &tm)) {
 248                         char errmsg[1024];
 249                         snprintf(errmsg, sizeof(errmsg),
 250                                 "Failed to parse '%s' as time", yytext);
 251                         sdb_parser_yyerror(yylloc, yyscanner, errmsg);
 252                         return SCANNER_ERROR;
 253                 }
 254
 255                 t = tm.tm_sec + 60 * tm.tm_min + 3600 * tm.tm_hour;
 256                 yylval->datetime = SECS_TO_SDB_TIME(t);
 257                 yylval->datetime += (sdb_time_t)strtoll(ns, NULL, 10);
 258                 return TIME;
 259         }
 260
 261 =       { return CMP_EQUAL; }
 262 !=      { return CMP_NEQUAL; }
 263 =~      { return CMP_REGEX; }
 264 !~      { return CMP_NREGEX; }
 265 \<      { return CMP_LT; }
 266 \<=     { return CMP_LE; }
 267 \>=     { return CMP_GE; }
 268 \>      { return CMP_GT; }
 269 \|\|    { return CONCAT; }
 270
 271 .       { /* XXX: */ return yytext[0]; }
 272
 273 %%
 274
 275 sdb_parser_yyscan_t
 276 sdb_parser_scanner_init(const char *str, int len, sdb_parser_yyextra_t *yyext)
 277 {
 278         yyscan_t scanner;
 279
 280         if (! str)
 281                 return NULL;
 282
 283         if (sdb_parser_yylex_init(&scanner)) {
 284                 char errbuf[1024];
 285                 sdb_strbuf_sprintf(yyext->errbuf, "yylex_init_failed: %s",
 286                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 287                 return NULL;
 288         }
 289
 290         sdb_parser_yyset_extra(yyext, scanner);
 291
 292         if (len < 0)
 293                 len = strlen(str);
 294
 295         /* the newly allocated buffer state (YY_BUFFER_STATE) is stored inside the
 296          * scanner and, thus, will be freed by yylex_destroy */
 297         sdb_parser_yy_scan_bytes(str, len, scanner);
 298         return scanner;
 299 } /* sdb_parser_scanner_init */
 300
 301 void
 302 sdb_parser_scanner_destroy(sdb_parser_yyscan_t scanner)
 303 {
 304         sdb_parser_yylex_destroy(scanner);
 305 } /* sdb_parser_scanner_destroy */
 306
 307 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 308