forked from sysdb/sysdb
/
scanner.l
301 lines (258 loc) · 7.18 KB
/
scanner.l
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/*
* SysDB - src/frontend/scanner.l
* Copyright (C) 2013 Sebastian 'tokkee' Harl <sh@tokkee.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
%{
#if HAVE_CONFIG_H
# include "config.h"
#endif /* HAVE_CONFIG_H */
#include "core/data.h"
#include "frontend/connection.h"
#include "frontend/parser.h"
#include "frontend/grammar.h"
#include "utils/error.h"
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#define YY_EXTRA_TYPE sdb_fe_yyextra_t *
static struct {
const char *name;
int id;
} reserved_words[] = {
{ "ALL", ALL },
{ "AND", AND },
{ "ANY", ANY },
{ "END", END },
{ "FETCH", FETCH },
{ "FILTER", FILTER },
{ "IN", IN },
{ "IS", IS },
{ "LIST", LIST },
{ "LOOKUP", LOOKUP },
{ "MATCHING", MATCHING },
{ "NOT", NOT },
{ "NULL", NULL_T },
{ "OR", OR },
{ "START", START },
{ "TIMESERIES", TIMESERIES },
/* object types */
{ "host", HOST_T },
{ "hosts", HOSTS_T },
{ "service", SERVICE_T },
{ "services", SERVICES_T },
{ "metric", METRIC_T },
{ "metrics", METRICS_T },
{ "attribute", ATTRIBUTE_T },
{ "attributes", ATTRIBUTES_T },
/* queryable fields */
{ "name", NAME_T },
{ "last_update", LAST_UPDATE_T },
{ "age", AGE_T },
{ "interval", INTERVAL_T },
{ "backend", BACKEND_T },
};
void
sdb_fe_yyerror(YYLTYPE *lval, sdb_fe_yyscan_t scanner, const char *msg);
%}
%option never-interactive
%option reentrant
%option bison-bridge
%option bison-locations
%option 8bit
%option yylineno
%option nodefault
%option noinput
%option nounput
%option noyywrap
%option verbose
%option warn
%option prefix="sdb_fe_yy" outfile="lex.yy.c"
%x CSC
whitespace ([ \t\n\r\f]+)
simple_comment ("--"[^\n\r]*)
/*
* C style comments
*/
csc_start \/\*
csc_inside ([^*/]+|[^*]\/|\*[^/])
csc_end \*\/
/*
* Strings and identifiers.
*/
identifier ([A-Za-z_][A-Za-z_0-9$]*)
/* TODO: fully support SQL strings */
string ('([^']|'')*')
/*
* Numeric constants.
*/
dec ([\+\-]?[0-9]+)
exp ([\+\-]?[0-9]+[Ee]\+?[0-9]+)
integer ({dec}|{exp})
float1 ([\+\-]?[0-9]+\.[0-9]*([Ee][\+\-]?[0-9]+)?)
float2 ([\+\-]?[0-9]*\.[0-9]+([Ee][\+\-]?[0-9]+)?)
float3 ([\+\-]?[0-9]+[Ee]\-[0-9]+)
float4 ([\+\-]?[Ii][Nn][Ff]([Ii][Nn][Ii][Tt][Yy])?)
float5 ([Nn][Aa][Nn])
float ({float1}|{float2}|{float3}|{float4}|{float5})
/*
* Time constants.
*/
date ([0-9]{4}-[0-9]{2}-[0-9]{2})
time ([0-9]{1,2}:[0-9]{1,2}(:[0-9]{1,2}(\.[0-9]{1,9})?)?)
%%
{whitespace} |
{simple_comment} { /* ignore */ }
{csc_start} { BEGIN(CSC); }
<CSC>{csc_inside} { /* ignore */ }
<CSC>{csc_end} { BEGIN(INITIAL); }
<CSC><<EOF>> {
sdb_fe_yyerror(yylloc, yyscanner, "unterminated C-style comment");
return SCANNER_ERROR;
}
{identifier} {
size_t i;
for (i = 0; i < SDB_STATIC_ARRAY_LEN(reserved_words); ++i)
if (! strcasecmp(reserved_words[i].name, yytext))
return reserved_words[i].id;
yylval->str = strdup(yytext);
return IDENTIFIER;
}
{string} {
char *quot;
size_t len;
/* remove the leading and trailing quote */
yytext[yyleng - 1] = '\0';
yylval->str = strdup(yytext + 1);
quot = yylval->str;
len = yyleng - 2;
while ((quot = strstr(quot, "''")) != NULL) {
memmove(quot, quot + 1, len - (quot - yylval->str) - 1);
yylval->str[len - 1] = '\0';
--len;
++quot;
}
return STRING;
}
{integer} {
yylval->data.data.integer = (int64_t)strtoll(yytext, NULL, 10);
yylval->data.type = SDB_TYPE_INTEGER;
return INTEGER;
}
{float} {
yylval->data.data.decimal = strtod(yytext, NULL);
yylval->data.type = SDB_TYPE_DECIMAL;
return FLOAT;
}
{date} {
struct tm tm;
memset(&tm, 0, sizeof(tm));
if (! strptime(yytext, "%Y-%m-%d", &tm)) {
char errmsg[1024];
snprintf(errmsg, sizeof(errmsg),
"Failed to parse '%s' as date", yytext);
sdb_fe_yyerror(yylloc, yyscanner, errmsg);
return SCANNER_ERROR;
}
yylval->datetime = SECS_TO_SDB_TIME(mktime(&tm));
return DATE;
}
{time} {
struct tm tm;
char time[9], ns[10];
char *tmp;
memset(&tm, 0, sizeof(tm));
memset(time, '\0', sizeof(time));
memset(ns, '0', sizeof(ns));
ns[sizeof(ns) - 1] = '\0';
tmp = strchr(yytext, '.');
if (tmp) {
size_t i;
*tmp = '\0';
++tmp;
strncpy(ns, tmp, sizeof(ns));
for (i = strlen(ns); i < 9; ++i)
ns[i] = '0';
}
strncpy(time, yytext, sizeof(time));
if (tmp) {
/* reset for better error messages */
--tmp;
*tmp = '.';
}
tmp = strchr(time, ':');
assert(tmp);
tmp = strchr(tmp + 1, ':');
if (! tmp)
strncat(time, ":00", sizeof(time));
if (! strptime(time, "%H:%M:%S", &tm)) {
char errmsg[1024];
snprintf(errmsg, sizeof(errmsg),
"Failed to parse '%s' as time", yytext);
sdb_fe_yyerror(yylloc, yyscanner, errmsg);
return SCANNER_ERROR;
}
yylval->datetime = SECS_TO_SDB_TIME(mktime(&tm));
yylval->datetime += (sdb_time_t)strtoll(ns, NULL, 10);
return TIME;
}
= { return CMP_EQUAL; }
!= { return CMP_NEQUAL; }
=~ { return CMP_REGEX; }
!~ { return CMP_NREGEX; }
\< { return CMP_LT; }
\<= { return CMP_LE; }
\>= { return CMP_GE; }
\> { return CMP_GT; }
\|\| { return CONCAT; }
. { /* XXX: */ return yytext[0]; }
%%
sdb_fe_yyscan_t
sdb_fe_scanner_init(const char *str, int len, sdb_fe_yyextra_t *yyext)
{
yyscan_t scanner;
if (! str)
return NULL;
if (sdb_fe_yylex_init(&scanner)) {
char errbuf[1024];
sdb_log(SDB_LOG_ERR, "frontend: yylex_init failed: %s",
sdb_strerror(errno, errbuf, sizeof(errbuf)));
return NULL;
}
sdb_fe_yyset_extra(yyext, scanner);
if (len < 0)
len = strlen(str);
/* the newly allocated buffer state (YY_BUFFER_STATE) is stored inside the
* scanner and, thus, will be freed by yylex_destroy */
sdb_fe_yy_scan_bytes(str, len, scanner);
return scanner;
} /* sdb_fe_scanner_init */
void
sdb_fe_scanner_destroy(sdb_fe_yyscan_t scanner)
{
sdb_fe_yylex_destroy(scanner);
} /* sdb_fe_scanner_destroy */
/* vim: set tw=78 sw=4 ts=4 noexpandtab : */