src/frontend/scanner.l

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