mirror of
https://github.com/prometheus/prometheus.git
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182de6b99f
Unary expressions cause parsing errors if they are done in the lexer by tokenizing them into the number. This fix moves unary expressions to the parser.
282 lines
10 KiB
Plaintext
282 lines
10 KiB
Plaintext
// Copyright 2013 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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%{
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package rules
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import (
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clientmodel "github.com/prometheus/client_golang/model"
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"github.com/prometheus/prometheus/rules/ast"
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"github.com/prometheus/prometheus/storage/metric"
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)
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%}
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%union {
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num clientmodel.SampleValue
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str string
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ruleNode ast.Node
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ruleNodeSlice []ast.Node
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boolean bool
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labelNameSlice clientmodel.LabelNames
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labelSet clientmodel.LabelSet
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labelMatcher *metric.LabelMatcher
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labelMatchers metric.LabelMatchers
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vectorMatching *vectorMatching
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}
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/* We simulate multiple start symbols for closely-related grammars via dummy tokens. See
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http://www.gnu.org/software/bison/manual/html_node/Multiple-start_002dsymbols.html
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Reason: we want to be able to parse lists of named rules as well as single expressions.
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*/
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%token START_RULES START_EXPRESSION
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%token <str> IDENTIFIER STRING DURATION METRICNAME
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%token <num> NUMBER
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%token PERMANENT GROUP_OP KEEPING_EXTRA OFFSET MATCH_OP
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%token <str> AGGR_OP CMP_OP ADDITIVE_OP MULT_OP MATCH_MOD
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%token ALERT IF FOR WITH SUMMARY DESCRIPTION
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%type <ruleNodeSlice> func_arg_list
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%type <labelNameSlice> label_list grouping_opts
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%type <labelSet> label_assign label_assign_list rule_labels
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%type <labelMatcher> label_match
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%type <labelMatchers> label_match_list label_matches
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%type <vectorMatching> vector_matching
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%type <ruleNode> rule_expr func_arg
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%type <boolean> qualifier extra_labels_opts
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%type <str> for_duration metric_name label_match_type offset_opts
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%right '='
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%left CMP_OP
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%left ADDITIVE_OP
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%left MULT_OP
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%start start
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%%
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start : START_RULES rules_stat_list
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| START_EXPRESSION saved_rule_expr
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;
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rules_stat_list : /* empty */
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| rules_stat_list rules_stat
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;
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saved_rule_expr : rule_expr
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{ yylex.(*RulesLexer).parsedExpr = $1 }
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;
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rules_stat : qualifier metric_name rule_labels '=' rule_expr
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{
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rule, err := CreateRecordingRule($2, $3, $5, $1)
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if err != nil { yylex.Error(err.Error()); return 1 }
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yylex.(*RulesLexer).parsedRules = append(yylex.(*RulesLexer).parsedRules, rule)
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}
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| ALERT IDENTIFIER IF rule_expr for_duration WITH rule_labels SUMMARY STRING DESCRIPTION STRING
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{
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rule, err := CreateAlertingRule($2, $4, $5, $7, $9, $11)
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if err != nil { yylex.Error(err.Error()); return 1 }
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yylex.(*RulesLexer).parsedRules = append(yylex.(*RulesLexer).parsedRules, rule)
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}
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;
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for_duration : /* empty */
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{ $$ = "0s" }
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| FOR DURATION
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{ $$ = $2 }
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;
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qualifier : /* empty */
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{ $$ = false }
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| PERMANENT
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{ $$ = true }
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;
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metric_name : METRICNAME
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{ $$ = $1 }
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| IDENTIFIER
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{ $$ = $1 }
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;
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rule_labels : /* empty */
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{ $$ = clientmodel.LabelSet{} }
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| '{' label_assign_list '}'
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{ $$ = $2 }
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| '{' '}'
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{ $$ = clientmodel.LabelSet{} }
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label_assign_list : label_assign
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{ $$ = $1 }
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| label_assign_list ',' label_assign
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{ for k, v := range $3 { $$[k] = v } }
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;
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label_assign : IDENTIFIER '=' STRING
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{ $$ = clientmodel.LabelSet{ clientmodel.LabelName($1): clientmodel.LabelValue($3) } }
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;
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label_matches : /* empty */
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{ $$ = metric.LabelMatchers{} }
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| '{' '}'
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{ $$ = metric.LabelMatchers{} }
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| '{' label_match_list '}'
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{ $$ = $2 }
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;
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label_match_list : label_match
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{ $$ = metric.LabelMatchers{$1} }
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| label_match_list ',' label_match
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{ $$ = append($$, $3) }
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;
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label_match : IDENTIFIER label_match_type STRING
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{
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var err error
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$$, err = newLabelMatcher($2, clientmodel.LabelName($1), clientmodel.LabelValue($3))
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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;
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label_match_type : '='
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{ $$ = "=" }
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| CMP_OP
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{ $$ = $1 }
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;
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offset_opts : /* empty */
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{ $$ = "0s" }
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| OFFSET DURATION
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{ $$ = $2 }
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;
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rule_expr : '(' rule_expr ')'
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{ $$ = $2 }
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| '{' label_match_list '}' offset_opts
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{
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var err error
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$$, err = NewVectorSelector($2, $4)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| metric_name label_matches offset_opts
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{
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var err error
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m, err := metric.NewLabelMatcher(metric.Equal, clientmodel.MetricNameLabel, clientmodel.LabelValue($1))
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if err != nil { yylex.Error(err.Error()); return 1 }
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$2 = append($2, m)
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$$, err = NewVectorSelector($2, $3)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| IDENTIFIER '(' func_arg_list ')'
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{
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var err error
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$$, err = NewFunctionCall($1, $3)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| IDENTIFIER '(' ')'
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{
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var err error
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$$, err = NewFunctionCall($1, []ast.Node{})
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| rule_expr '[' DURATION ']' offset_opts
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{
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var err error
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$$, err = NewMatrixSelector($1, $3, $5)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| AGGR_OP '(' rule_expr ')' grouping_opts extra_labels_opts
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{
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var err error
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$$, err = NewVectorAggregation($1, $3, $5, $6)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| AGGR_OP grouping_opts extra_labels_opts '(' rule_expr ')'
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{
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var err error
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$$, err = NewVectorAggregation($1, $5, $2, $3)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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/* Yacc can only attach associativity to terminals, so we
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* have to list all operators here. */
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| rule_expr ADDITIVE_OP vector_matching rule_expr
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{
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var err error
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$$, err = NewArithExpr($2, $1, $4, $3)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| rule_expr MULT_OP vector_matching rule_expr
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{
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var err error
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$$, err = NewArithExpr($2, $1, $4, $3)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| rule_expr CMP_OP vector_matching rule_expr
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{
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var err error
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$$, err = NewArithExpr($2, $1, $4, $3)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| NUMBER
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{ $$ = NewScalarLiteral($1, "+")}
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| ADDITIVE_OP NUMBER
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{ $$ = NewScalarLiteral($2, $1)}
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;
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extra_labels_opts : /* empty */
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{ $$ = false }
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| KEEPING_EXTRA
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{ $$ = true }
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;
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vector_matching : /* empty */
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{ $$ = nil }
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| MATCH_OP '(' label_list ')'
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{
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var err error
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$$, err = newVectorMatching("", $3, nil)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| MATCH_OP '(' label_list ')' MATCH_MOD '(' label_list ')'
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{
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var err error
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$$, err = newVectorMatching($5, $3, $7)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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;
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grouping_opts :
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{ $$ = clientmodel.LabelNames{} }
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| GROUP_OP '(' label_list ')'
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{ $$ = $3 }
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;
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label_list : IDENTIFIER
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{ $$ = clientmodel.LabelNames{clientmodel.LabelName($1)} }
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| label_list ',' IDENTIFIER
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{ $$ = append($$, clientmodel.LabelName($3)) }
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;
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func_arg_list : func_arg
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{ $$ = []ast.Node{$1} }
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| func_arg_list ',' func_arg
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{ $$ = append($$, $3) }
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;
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func_arg : rule_expr
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{ $$ = $1 }
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| STRING
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{ $$ = ast.NewStringLiteral($1) }
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;
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%%
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