prometheus/rules/lexer.l

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%{
package rules
import (
"github.com/matttproud/prometheus/model"
"strconv"
)
%}
D [0-9]
L [a-zA-Z_:]
%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 { return GROUP_OP }
AVG|SUM|MAX|MIN { yylval.str = 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 }
{L}({L}|{D})+ { yylval.str = yytext; return IDENTIFIER }
\-?{D}+(\.{D}*)? { num, err := strconv.ParseFloat(yytext, 32);
if (err != nil) { rulesError("Invalid float %v", yytext) }
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) */ }
%%