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         { "FALSE",       FALSE },
  60         { "FETCH",       FETCH },
  61         { "FILTER",      FILTER },
  62         { "IN",          IN },
  63         { "IS",          IS },
  64         { "LAST",        LAST },
  65         { "LIST",        LIST },
  66         { "LOOKUP",      LOOKUP },
  67         { "MATCHING",    MATCHING },
  68         { "NOT",         NOT },
  69         { "NULL",        NULL_T },
  70         { "OR",          OR },
  71         { "START",       START },
  72         { "STORE",       STORE },
  73         { "TIMESERIES",  TIMESERIES },
  74         { "TRUE",        TRUE },
  75         { "UPDATE",      UPDATE },
  76
  77         /* object types */
  78         { "host",        HOST_T },
  79         { "hosts",       HOSTS_T },
  80         { "service",     SERVICE_T },
  81         { "services",    SERVICES_T },
  82         { "metric",      METRIC_T },
  83         { "metrics",     METRICS_T },
  84         { "attribute",   ATTRIBUTE_T },
  85         { "attributes",  ATTRIBUTES_T },
  86         /* queryable fields */
  87         { "name",        NAME_T },
  88         { "last_update", LAST_UPDATE_T },
  89         { "age",         AGE_T },
  90         { "interval",    INTERVAL_T },
  91         { "backend",     BACKEND_T },
  92         { "value",       VALUE_T },
  93 };
  94
  95 void
  96 sdb_parser_yyerror(YYLTYPE *lval, sdb_parser_yyscan_t scanner, const char *msg);
  97
  98 %}
  99
 100 %option never-interactive
 101 %option reentrant
 102 %option bison-bridge
 103 %option bison-locations
 104 %option 8bit
 105 %option yylineno
 106 %option nodefault
 107 %option noinput
 108 %option nounput
 109 %option noyywrap
 110 %option warn
 111 %option prefix="sdb_parser_yy" outfile="lex.yy.c"
 112
 113 %x CSC
 114
 115 whitespace              ([ \t\n\r\f]+)
 116 simple_comment  ("--"[^\n\r]*)
 117
 118 /*
 119  * C style comments
 120  */
 121 csc_start       \/\*
 122 csc_inside      ([^*/]+|[^*]\/|\*[^/])
 123 csc_end         \*\/
 124
 125 /*
 126  * Strings and identifiers.
 127  */
 128 identifier      ([A-Za-z_][A-Za-z_0-9$]*)
 129 /* TODO: fully support SQL strings */
 130 string          ('([^']|'')*')
 131
 132 /*
 133  * Numeric constants.
 134  */
 135 dec                     ([\+\-]?[0-9]+)
 136 exp                     ([\+\-]?[0-9]+[Ee]\+?[0-9]+)
 137 integer         ({dec}|{exp})
 138 float1          ([\+\-]?[0-9]+\.[0-9]*([Ee][\+\-]?[0-9]+)?)
 139 float2          ([\+\-]?[0-9]*\.[0-9]+([Ee][\+\-]?[0-9]+)?)
 140 float3          ([\+\-]?[0-9]+[Ee]\-[0-9]+)
 141 float4          ([\+\-]?[Ii][Nn][Ff]([Ii][Nn][Ii][Tt][Yy])?)
 142 float5          ([Nn][Aa][Nn])
 143 float           ({float1}|{float2}|{float3}|{float4}|{float5})
 144
 145 /*
 146  * Time constants.
 147  */
 148 date            ([0-9]{4}-[0-9]{2}-[0-9]{2})
 149 time            ([0-9]{1,2}:[0-9]{1,2}(:[0-9]{1,2}(\.[0-9]{1,9})?)?)
 150
 151 %%
 152
 153 {whitespace} |
 154 {simple_comment}        { /* ignore */ }
 155
 156 {csc_start}                     { BEGIN(CSC); }
 157 <CSC>{csc_inside}       { /* ignore */ }
 158 <CSC>{csc_end}          { BEGIN(INITIAL); }
 159 <CSC><<EOF>> {
 160                 sdb_parser_yyerror(yylloc, yyscanner, "unterminated C-style comment");
 161                 return SCANNER_ERROR;
 162         }
 163
 164 {identifier} {
 165                 size_t i;
 166                 for (i = 0; i < SDB_STATIC_ARRAY_LEN(reserved_words); ++i)
 167                         if (! strcasecmp(reserved_words[i].name, yytext))
 168                                 return reserved_words[i].id;
 169
 170                 yylval->str = strdup(yytext);
 171                 return IDENTIFIER;
 172         }
 173 {string} {
 174                 char *quot;
 175                 size_t len;
 176
 177                 /* remove the leading and trailing quote */
 178                 yytext[yyleng - 1] = '\0';
 179                 yylval->str = strdup(yytext + 1);
 180
 181                 quot = yylval->str;
 182                 len = yyleng - 2;
 183                 while ((quot = strstr(quot, "''")) != NULL) {
 184                         memmove(quot, quot + 1, len - (quot - yylval->str) - 1);
 185                         yylval->str[len - 1] = '\0';
 186                         --len;
 187                         ++quot;
 188                 }
 189                 return STRING;
 190         }
 191 {integer} {
 192                 yylval->data.data.integer = (int64_t)strtoll(yytext, NULL, 10);
 193                 yylval->data.type = SDB_TYPE_INTEGER;
 194                 return INTEGER;
 195         }
 196 {float} {
 197                 yylval->data.data.decimal = strtod(yytext, NULL);
 198                 yylval->data.type = SDB_TYPE_DECIMAL;
 199                 return FLOAT;
 200         }
 201
 202 {date} {
 203                 struct tm tm;
 204                 memset(&tm, 0, sizeof(tm));
 205                 if (! strptime(yytext, "%Y-%m-%d", &tm)) {
 206                         char errmsg[1024];
 207                         snprintf(errmsg, sizeof(errmsg),
 208                                 "Failed to parse '%s' as date", yytext);
 209                         sdb_parser_yyerror(yylloc, yyscanner, errmsg);
 210                         return SCANNER_ERROR;
 211                 }
 212                 yylval->datetime = SECS_TO_SDB_TIME(mktime(&tm));
 213                 return DATE;
 214         }
 215 {time} {
 216                 struct tm tm;
 217                 char time[9], ns[10];
 218                 char *tmp;
 219                 int t;
 220
 221                 memset(&tm, 0, sizeof(tm));
 222                 memset(time, '\0', sizeof(time));
 223                 memset(ns, '0', sizeof(ns));
 224                 ns[sizeof(ns) - 1] = '\0';
 225
 226                 tmp = strchr(yytext, '.');
 227                 if (tmp) {
 228                         size_t i;
 229                         *tmp = '\0';
 230                         ++tmp;
 231                         strncpy(ns, tmp, sizeof(ns));
 232                         for (i = strlen(ns); i < 9; ++i)
 233                                 ns[i] = '0';
 234                 }
 235                 strncpy(time, yytext, sizeof(time));
 236                 if (tmp) {
 237                         /* reset for better error messages */
 238                         --tmp;
 239                         *tmp = '.';
 240                 }
 241
 242                 tmp = strchr(time, ':');
 243                 assert(tmp);
 244                 tmp = strchr(tmp + 1, ':');
 245                 if (! tmp)
 246                         strncat(time, ":00", sizeof(time) - strlen(time) - 1);
 247
 248                 if (! strptime(time, "%H:%M:%S", &tm)) {
 249                         char errmsg[1024];
 250                         snprintf(errmsg, sizeof(errmsg),
 251                                 "Failed to parse '%s' as time", yytext);
 252                         sdb_parser_yyerror(yylloc, yyscanner, errmsg);
 253                         return SCANNER_ERROR;
 254                 }
 255
 256                 t = tm.tm_sec + 60 * tm.tm_min + 3600 * tm.tm_hour;
 257                 yylval->datetime = SECS_TO_SDB_TIME(t);
 258                 yylval->datetime += (sdb_time_t)strtoll(ns, NULL, 10);
 259                 return TIME;
 260         }
 261
 262 =       { return CMP_EQUAL; }
 263 !=      { return CMP_NEQUAL; }
 264 =~      { return CMP_REGEX; }
 265 !~      { return CMP_NREGEX; }
 266 \<      { return CMP_LT; }
 267 \<=     { return CMP_LE; }
 268 \>=     { return CMP_GE; }
 269 \>      { return CMP_GT; }
 270 \|\|    { return CONCAT; }
 271
 272 .       { /* XXX: */ return yytext[0]; }
 273
 274 %%
 275
 276 sdb_parser_yyscan_t
 277 sdb_parser_scanner_init(const char *str, int len, sdb_parser_yyextra_t *yyext)
 278 {
 279         yyscan_t scanner;
 280
 281         if (! str)
 282                 return NULL;
 283
 284         if (sdb_parser_yylex_init(&scanner)) {
 285                 char errbuf[1024];
 286                 sdb_strbuf_sprintf(yyext->errbuf, "yylex_init_failed: %s",
 287                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 288                 return NULL;
 289         }
 290
 291         sdb_parser_yyset_extra(yyext, scanner);
 292
 293         if (len < 0)
 294                 len = strlen(str);
 295
 296         /* the newly allocated buffer state (YY_BUFFER_STATE) is stored inside the
 297          * scanner and, thus, will be freed by yylex_destroy */
 298         sdb_parser_yy_scan_bytes(str, len, scanner);
 299         return scanner;
 300 } /* sdb_parser_scanner_init */
 301
 302 void
 303 sdb_parser_scanner_destroy(sdb_parser_yyscan_t scanner)
 304 {
 305         sdb_parser_yylex_destroy(scanner);
 306 } /* sdb_parser_scanner_destroy */
 307
 308 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 309