prometheus/rules/lexer.l
2013-04-15 11:56:23 +02:00

66 lines
2.5 KiB
Plaintext

/* Copyright 2013 Prometheus Team
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http: *www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License. */
%{
package rules
import (
"github.com/prometheus/prometheus/model"
"strconv"
"strings"
)
%}
D [0-9]
L [a-zA-Z_:]
U [smhdwy]
%x S_COMMENTS
%%
. { yypos++; REJECT }
\n { yyline++; yypos = 1; REJECT }
"/*" { BEGIN(S_COMMENTS) }
<S_COMMENTS>"*/" { BEGIN(0) }
<S_COMMENTS>. { /* ignore chars within multi-line comments */ }
\/\/[^\r\n]*\n { /* gobble up one-line comments */ }
permanent { return PERMANENT }
BY|by { return GROUP_OP }
AVG|SUM|MAX|MIN { yylval.str = yytext; return AGGR_OP }
avg|sum|max|min { yylval.str = strings.ToUpper(yytext); return AGGR_OP }
\<|>|AND|OR { yylval.str = yytext; return CMP_OP }
==|!=|>=|<= { yylval.str = yytext; return CMP_OP }
[+\-] { yylval.str = yytext; return ADDITIVE_OP }
[*/%] { yylval.str = yytext; return MULT_OP }
{D}+{U} { yylval.str = yytext; return DURATION }
{L}({L}|{D})* { yylval.str = yytext; return IDENTIFIER }
\-?{D}+(\.{D}*)? { num, err := strconv.ParseFloat(yytext, 32);
if (err != nil && err.(*strconv.NumError).Err == strconv.ErrSyntax) {
panic("Invalid float")
}
yylval.num = model.SampleValue(num)
return NUMBER }
\"(\\.|[^\\"])*\" { yylval.str = yytext[1:len(yytext) - 1]; return STRING }
\'(\\.|[^\\'])*\' { yylval.str = yytext[1:len(yytext) - 1]; return STRING }
[{}\[\]()=,] { return int(yytext[0]) }
. { /* don't print any remaining chars (whitespace) */ }
\n { /* don't print any remaining chars (whitespace) */ }
%%