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710 lines
24 KiB
710 lines
24 KiB
// Copyright 2019 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 parser |
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import ( |
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"math" |
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"sort" |
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"strconv" |
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"time" |
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|
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"github.com/prometheus/prometheus/pkg/labels" |
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"github.com/prometheus/prometheus/pkg/value" |
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) |
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%} |
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%union { |
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node Node |
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item Item |
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matchers []*labels.Matcher |
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matcher *labels.Matcher |
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label labels.Label |
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labels labels.Labels |
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strings []string |
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series []SequenceValue |
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uint uint64 |
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float float64 |
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duration time.Duration |
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} |
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%token <item> |
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EQL |
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BLANK |
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COLON |
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COMMA |
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COMMENT |
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DURATION |
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EOF |
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ERROR |
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IDENTIFIER |
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LEFT_BRACE |
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LEFT_BRACKET |
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LEFT_PAREN |
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METRIC_IDENTIFIER |
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NUMBER |
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RIGHT_BRACE |
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RIGHT_BRACKET |
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RIGHT_PAREN |
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SEMICOLON |
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SPACE |
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STRING |
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TIMES |
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// Operators. |
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%token operatorsStart |
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%token <item> |
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ADD |
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DIV |
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EQLC |
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EQL_REGEX |
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GTE |
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GTR |
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LAND |
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LOR |
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LSS |
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LTE |
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LUNLESS |
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MOD |
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MUL |
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NEQ |
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NEQ_REGEX |
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POW |
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SUB |
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%token operatorsEnd |
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// Aggregators. |
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%token aggregatorsStart |
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%token <item> |
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AVG |
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BOTTOMK |
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COUNT |
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COUNT_VALUES |
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GROUP |
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MAX |
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MIN |
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QUANTILE |
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STDDEV |
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STDVAR |
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SUM |
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TOPK |
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%token aggregatorsEnd |
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// Keywords. |
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%token keywordsStart |
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%token <item> |
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BOOL |
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BY |
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GROUP_LEFT |
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GROUP_RIGHT |
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IGNORING |
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OFFSET |
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ON |
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WITHOUT |
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%token keywordsEnd |
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// Start symbols for the generated parser. |
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%token startSymbolsStart |
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%token |
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START_METRIC |
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START_SERIES_DESCRIPTION |
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START_EXPRESSION |
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START_METRIC_SELECTOR |
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%token startSymbolsEnd |
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// Type definitions for grammar rules. |
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%type <matchers> label_match_list |
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%type <matcher> label_matcher |
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%type <item> aggregate_op grouping_label match_op maybe_label metric_identifier unary_op |
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%type <labels> label_set label_set_list metric |
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%type <label> label_set_item |
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%type <strings> grouping_label_list grouping_labels maybe_grouping_labels |
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%type <series> series_item series_values |
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%type <uint> uint |
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%type <float> number series_value signed_number |
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%type <node> aggregate_expr aggregate_modifier bin_modifier binary_expr bool_modifier expr function_call function_call_args function_call_body group_modifiers label_matchers matrix_selector number_literal offset_expr on_or_ignoring paren_expr string_literal subquery_expr unary_expr vector_selector |
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%type <duration> duration maybe_duration |
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%start start |
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// Operators are listed with increasing precedence. |
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%left LOR |
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%left LAND LUNLESS |
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%left EQLC GTE GTR LSS LTE NEQ |
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%left ADD SUB |
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%left MUL DIV MOD |
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%right POW |
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// Offset modifiers do not have associativity. |
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%nonassoc OFFSET |
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// This ensures that it is always attempted to parse range or subquery selectors when a left |
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// bracket is encountered. |
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%right LEFT_BRACKET |
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%% |
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start : |
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START_METRIC metric |
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{ yylex.(*parser).generatedParserResult = $2 } |
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| START_SERIES_DESCRIPTION series_description |
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| START_EXPRESSION /* empty */ EOF |
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{ yylex.(*parser).addParseErrf(PositionRange{}, "no expression found in input")} |
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| START_EXPRESSION expr |
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{ yylex.(*parser).generatedParserResult = $2 } |
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| START_METRIC_SELECTOR vector_selector |
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{ yylex.(*parser).generatedParserResult = $2 } |
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| start EOF |
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| error /* If none of the more detailed error messages are triggered, we fall back to this. */ |
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{ yylex.(*parser).unexpected("","") } |
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; |
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expr : |
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aggregate_expr |
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| binary_expr |
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| function_call |
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| matrix_selector |
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| number_literal |
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| offset_expr |
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| paren_expr |
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| string_literal |
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| subquery_expr |
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| unary_expr |
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| vector_selector |
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; |
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/* |
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* Aggregations. |
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*/ |
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aggregate_expr : aggregate_op aggregate_modifier function_call_body |
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{ $$ = yylex.(*parser).newAggregateExpr($1, $2, $3) } |
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| aggregate_op function_call_body aggregate_modifier |
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{ $$ = yylex.(*parser).newAggregateExpr($1, $3, $2) } |
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| aggregate_op function_call_body |
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{ $$ = yylex.(*parser).newAggregateExpr($1, &AggregateExpr{}, $2) } |
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| aggregate_op error |
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{ |
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yylex.(*parser).unexpected("aggregation",""); |
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$$ = yylex.(*parser).newAggregateExpr($1, &AggregateExpr{}, Expressions{}) |
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} |
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; |
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aggregate_modifier: |
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BY grouping_labels |
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{ |
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$$ = &AggregateExpr{ |
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Grouping: $2, |
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} |
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} |
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| WITHOUT grouping_labels |
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{ |
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$$ = &AggregateExpr{ |
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Grouping: $2, |
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Without: true, |
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} |
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} |
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; |
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/* |
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* Binary expressions. |
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*/ |
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// Operator precedence only works if each of those is listed separately. |
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binary_expr : expr ADD bin_modifier expr { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) } |
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| expr DIV bin_modifier expr { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) } |
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| expr EQLC bin_modifier expr { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) } |
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| expr GTE bin_modifier expr { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) } |
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| expr GTR bin_modifier expr { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) } |
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| expr LAND bin_modifier expr { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) } |
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| expr LOR bin_modifier expr { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) } |
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| expr LSS bin_modifier expr { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) } |
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| expr LTE bin_modifier expr { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) } |
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| expr LUNLESS bin_modifier expr { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) } |
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| expr MOD bin_modifier expr { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) } |
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| expr MUL bin_modifier expr { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) } |
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| expr NEQ bin_modifier expr { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) } |
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| expr POW bin_modifier expr { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) } |
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| expr SUB bin_modifier expr { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) } |
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; |
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// Using left recursion for the modifier rules, helps to keep the parser stack small and |
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// reduces allocations |
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bin_modifier : group_modifiers; |
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bool_modifier : /* empty */ |
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{ $$ = &BinaryExpr{ |
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VectorMatching: &VectorMatching{Card: CardOneToOne}, |
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} |
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} |
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| BOOL |
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{ $$ = &BinaryExpr{ |
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VectorMatching: &VectorMatching{Card: CardOneToOne}, |
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ReturnBool: true, |
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} |
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} |
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; |
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on_or_ignoring : bool_modifier IGNORING grouping_labels |
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{ |
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$$ = $1 |
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$$.(*BinaryExpr).VectorMatching.MatchingLabels = $3 |
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} |
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| bool_modifier ON grouping_labels |
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{ |
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$$ = $1 |
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$$.(*BinaryExpr).VectorMatching.MatchingLabels = $3 |
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$$.(*BinaryExpr).VectorMatching.On = true |
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} |
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; |
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group_modifiers: bool_modifier /* empty */ |
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| on_or_ignoring /* empty */ |
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| on_or_ignoring GROUP_LEFT maybe_grouping_labels |
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{ |
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$$ = $1 |
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$$.(*BinaryExpr).VectorMatching.Card = CardManyToOne |
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$$.(*BinaryExpr).VectorMatching.Include = $3 |
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} |
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| on_or_ignoring GROUP_RIGHT maybe_grouping_labels |
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{ |
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$$ = $1 |
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$$.(*BinaryExpr).VectorMatching.Card = CardOneToMany |
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$$.(*BinaryExpr).VectorMatching.Include = $3 |
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} |
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; |
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grouping_labels : LEFT_PAREN grouping_label_list RIGHT_PAREN |
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{ $$ = $2 } |
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| LEFT_PAREN grouping_label_list COMMA RIGHT_PAREN |
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{ $$ = $2 } |
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| LEFT_PAREN RIGHT_PAREN |
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{ $$ = []string{} } |
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| error |
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{ yylex.(*parser).unexpected("grouping opts", "\"(\""); $$ = nil } |
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; |
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grouping_label_list: |
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grouping_label_list COMMA grouping_label |
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{ $$ = append($1, $3.Val) } |
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| grouping_label |
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{ $$ = []string{$1.Val} } |
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| grouping_label_list error |
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{ yylex.(*parser).unexpected("grouping opts", "\",\" or \")\""); $$ = $1 } |
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; |
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grouping_label : maybe_label |
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{ |
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if !isLabel($1.Val) { |
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yylex.(*parser).unexpected("grouping opts", "label") |
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} |
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$$ = $1 |
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} |
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| error |
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{ yylex.(*parser).unexpected("grouping opts", "label"); $$ = Item{} } |
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; |
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/* |
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* Function calls. |
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*/ |
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function_call : IDENTIFIER function_call_body |
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{ |
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fn, exist := getFunction($1.Val) |
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if !exist{ |
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yylex.(*parser).addParseErrf($1.PositionRange(),"unknown function with name %q", $1.Val) |
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} |
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$$ = &Call{ |
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Func: fn, |
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Args: $2.(Expressions), |
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PosRange: PositionRange{ |
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Start: $1.Pos, |
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End: yylex.(*parser).lastClosing, |
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}, |
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} |
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} |
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; |
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function_call_body: LEFT_PAREN function_call_args RIGHT_PAREN |
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{ $$ = $2 } |
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| LEFT_PAREN RIGHT_PAREN |
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{$$ = Expressions{}} |
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; |
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function_call_args: function_call_args COMMA expr |
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{ $$ = append($1.(Expressions), $3.(Expr)) } |
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| expr |
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{ $$ = Expressions{$1.(Expr)} } |
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| function_call_args COMMA |
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{ |
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yylex.(*parser).addParseErrf($2.PositionRange(), "trailing commas not allowed in function call args") |
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$$ = $1 |
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} |
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; |
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/* |
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* Expressions inside parentheses. |
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*/ |
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paren_expr : LEFT_PAREN expr RIGHT_PAREN |
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{ $$ = &ParenExpr{Expr: $2.(Expr), PosRange: mergeRanges(&$1, &$3)} } |
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; |
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/* |
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* Offset modifiers. |
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*/ |
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offset_expr: expr OFFSET duration |
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{ |
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yylex.(*parser).addOffset($1, $3) |
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$$ = $1 |
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} |
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| expr OFFSET error |
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{ yylex.(*parser).unexpected("offset", "duration"); $$ = $1 } |
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; |
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/* |
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* Subquery and range selectors. |
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*/ |
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matrix_selector : expr LEFT_BRACKET duration RIGHT_BRACKET |
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{ |
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var errMsg string |
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vs, ok := $1.(*VectorSelector) |
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if !ok{ |
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errMsg = "ranges only allowed for vector selectors" |
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} else if vs.Offset != 0{ |
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errMsg = "no offset modifiers allowed before range" |
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} |
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if errMsg != ""{ |
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errRange := mergeRanges(&$2, &$4) |
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yylex.(*parser).addParseErrf(errRange, errMsg) |
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} |
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$$ = &MatrixSelector{ |
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VectorSelector: $1.(Expr), |
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Range: $3, |
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EndPos: yylex.(*parser).lastClosing, |
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} |
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} |
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; |
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subquery_expr : expr LEFT_BRACKET duration COLON maybe_duration RIGHT_BRACKET |
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{ |
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$$ = &SubqueryExpr{ |
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Expr: $1.(Expr), |
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Range: $3, |
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Step: $5, |
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EndPos: $6.Pos + 1, |
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} |
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} |
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| expr LEFT_BRACKET duration COLON duration error |
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{ yylex.(*parser).unexpected("subquery selector", "\"]\""); $$ = $1 } |
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| expr LEFT_BRACKET duration COLON error |
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{ yylex.(*parser).unexpected("subquery selector", "duration or \"]\""); $$ = $1 } |
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| expr LEFT_BRACKET duration error |
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{ yylex.(*parser).unexpected("subquery or range", "\":\" or \"]\""); $$ = $1 } |
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| expr LEFT_BRACKET error |
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{ yylex.(*parser).unexpected("subquery selector", "duration"); $$ = $1 } |
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; |
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/* |
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* Unary expressions. |
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*/ |
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unary_expr : |
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/* gives the rule the same precedence as MUL. This aligns with mathematical conventions */ |
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unary_op expr %prec MUL |
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{ |
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if nl, ok := $2.(*NumberLiteral); ok { |
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if $1.Typ == SUB { |
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nl.Val *= -1 |
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} |
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nl.PosRange.Start = $1.Pos |
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$$ = nl |
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} else { |
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$$ = &UnaryExpr{Op: $1.Typ, Expr: $2.(Expr), StartPos: $1.Pos} |
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} |
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} |
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; |
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/* |
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* Vector selectors. |
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*/ |
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vector_selector: metric_identifier label_matchers |
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{ |
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vs := $2.(*VectorSelector) |
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vs.PosRange = mergeRanges(&$1, vs) |
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vs.Name = $1.Val |
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yylex.(*parser).assembleVectorSelector(vs) |
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$$ = vs |
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} |
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| metric_identifier |
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{ |
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vs := &VectorSelector{ |
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Name: $1.Val, |
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LabelMatchers: []*labels.Matcher{}, |
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PosRange: $1.PositionRange(), |
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} |
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yylex.(*parser).assembleVectorSelector(vs) |
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$$ = vs |
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} |
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| label_matchers |
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{ |
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vs := $1.(*VectorSelector) |
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yylex.(*parser).assembleVectorSelector(vs) |
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$$ = vs |
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} |
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; |
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label_matchers : LEFT_BRACE label_match_list RIGHT_BRACE |
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{ |
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$$ = &VectorSelector{ |
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LabelMatchers: $2, |
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PosRange: mergeRanges(&$1, &$3), |
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} |
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} |
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| LEFT_BRACE label_match_list COMMA RIGHT_BRACE |
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{ |
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$$ = &VectorSelector{ |
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LabelMatchers: $2, |
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PosRange: mergeRanges(&$1, &$4), |
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} |
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} |
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| LEFT_BRACE RIGHT_BRACE |
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{ |
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$$ = &VectorSelector{ |
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LabelMatchers: []*labels.Matcher{}, |
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PosRange: mergeRanges(&$1, &$2), |
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} |
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} |
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; |
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label_match_list: label_match_list COMMA label_matcher |
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{ |
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if $1 != nil{ |
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$$ = append($1, $3) |
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} else { |
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$$ = $1 |
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} |
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} |
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| label_matcher |
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{ $$ = []*labels.Matcher{$1}} |
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| label_match_list error |
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{ yylex.(*parser).unexpected("label matching", "\",\" or \"}\""); $$ = $1 } |
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; |
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label_matcher : IDENTIFIER match_op STRING |
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{ $$ = yylex.(*parser).newLabelMatcher($1, $2, $3); } |
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| IDENTIFIER match_op error |
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{ yylex.(*parser).unexpected("label matching", "string"); $$ = nil} |
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| IDENTIFIER error |
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{ yylex.(*parser).unexpected("label matching", "label matching operator"); $$ = nil } |
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| error |
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{ yylex.(*parser).unexpected("label matching", "identifier or \"}\""); $$ = nil} |
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; |
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/* |
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* Metric descriptions. |
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*/ |
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metric : metric_identifier label_set |
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{ $$ = append($2, labels.Label{Name: labels.MetricName, Value: $1.Val}); sort.Sort($$) } |
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| label_set |
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{$$ = $1} |
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; |
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metric_identifier: AVG | BOTTOMK | BY | COUNT | COUNT_VALUES | GROUP | IDENTIFIER | LAND | LOR | LUNLESS | MAX | METRIC_IDENTIFIER | MIN | OFFSET | QUANTILE | STDDEV | STDVAR | SUM | TOPK | WITHOUT; |
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label_set : LEFT_BRACE label_set_list RIGHT_BRACE |
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{ $$ = labels.New($2...) } |
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| LEFT_BRACE label_set_list COMMA RIGHT_BRACE |
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{ $$ = labels.New($2...) } |
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| LEFT_BRACE RIGHT_BRACE |
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{ $$ = labels.New() } |
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| /* empty */ |
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{ $$ = labels.New() } |
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; |
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label_set_list : label_set_list COMMA label_set_item |
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{ $$ = append($1, $3) } |
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| label_set_item |
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{ $$ = []labels.Label{$1} } |
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| label_set_list error |
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{ yylex.(*parser).unexpected("label set", "\",\" or \"}\"", ); $$ = $1 } |
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; |
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label_set_item : IDENTIFIER EQL STRING |
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{ $$ = labels.Label{Name: $1.Val, Value: yylex.(*parser).unquoteString($3.Val) } } |
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| IDENTIFIER EQL error |
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{ yylex.(*parser).unexpected("label set", "string"); $$ = labels.Label{}} |
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| IDENTIFIER error |
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{ yylex.(*parser).unexpected("label set", "\"=\""); $$ = labels.Label{}} |
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| error |
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{ yylex.(*parser).unexpected("label set", "identifier or \"}\""); $$ = labels.Label{} } |
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; |
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|
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/* |
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* Series descriptions (only used by unit tests). |
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*/ |
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series_description: metric series_values |
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{ |
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yylex.(*parser).generatedParserResult = &seriesDescription{ |
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labels: $1, |
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values: $2, |
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} |
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} |
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; |
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series_values : /*empty*/ |
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{ $$ = []SequenceValue{} } |
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| series_values SPACE series_item |
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{ $$ = append($1, $3...) } |
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| series_values SPACE |
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{ $$ = $1 } |
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| error |
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{ yylex.(*parser).unexpected("series values", ""); $$ = nil } |
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; |
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series_item : BLANK |
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{ $$ = []SequenceValue{{Omitted: true}}} |
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| BLANK TIMES uint |
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{ |
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$$ = []SequenceValue{} |
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for i:=uint64(0); i < $3; i++{ |
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$$ = append($$, SequenceValue{Omitted: true}) |
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} |
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} |
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| series_value |
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{ $$ = []SequenceValue{{Value: $1}}} |
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| series_value TIMES uint |
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{ |
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$$ = []SequenceValue{} |
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for i:=uint64(0); i <= $3; i++{ |
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$$ = append($$, SequenceValue{Value: $1}) |
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} |
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} |
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| series_value signed_number TIMES uint |
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{ |
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$$ = []SequenceValue{} |
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for i:=uint64(0); i <= $4; i++{ |
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$$ = append($$, SequenceValue{Value: $1}) |
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$1 += $2 |
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} |
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} |
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; |
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series_value : IDENTIFIER |
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{ |
|
if $1.Val != "stale" { |
|
yylex.(*parser).unexpected("series values", "number or \"stale\"") |
|
} |
|
$$ = math.Float64frombits(value.StaleNaN) |
|
} |
|
| number |
|
| signed_number |
|
; |
|
|
|
|
|
|
|
|
|
/* |
|
* Keyword lists. |
|
*/ |
|
|
|
aggregate_op : AVG | BOTTOMK | COUNT | COUNT_VALUES | GROUP | MAX | MIN | QUANTILE | STDDEV | STDVAR | SUM | TOPK ; |
|
|
|
// inside of grouping options label names can be recognized as keywords by the lexer. This is a list of keywords that could also be a label name. |
|
maybe_label : AVG | BOOL | BOTTOMK | BY | COUNT | COUNT_VALUES | GROUP | GROUP_LEFT | GROUP_RIGHT | IDENTIFIER | IGNORING | LAND | LOR | LUNLESS | MAX | METRIC_IDENTIFIER | MIN | OFFSET | ON | QUANTILE | STDDEV | STDVAR | SUM | TOPK; |
|
|
|
unary_op : ADD | SUB; |
|
|
|
match_op : EQL | NEQ | EQL_REGEX | NEQ_REGEX ; |
|
|
|
/* |
|
* Literals. |
|
*/ |
|
|
|
number_literal : NUMBER |
|
{ |
|
$$ = &NumberLiteral{ |
|
Val: yylex.(*parser).number($1.Val), |
|
PosRange: $1.PositionRange(), |
|
} |
|
} |
|
; |
|
|
|
number : NUMBER { $$ = yylex.(*parser).number($1.Val) } ; |
|
|
|
signed_number : ADD number { $$ = $2 } |
|
| SUB number { $$ = -$2 } |
|
; |
|
|
|
uint : NUMBER |
|
{ |
|
var err error |
|
$$, err = strconv.ParseUint($1.Val, 10, 64) |
|
if err != nil { |
|
yylex.(*parser).addParseErrf($1.PositionRange(), "invalid repetition in series values: %s", err) |
|
} |
|
} |
|
; |
|
|
|
duration : DURATION |
|
{ |
|
var err error |
|
$$, err = parseDuration($1.Val) |
|
if err != nil { |
|
yylex.(*parser).addParseErr($1.PositionRange(), err) |
|
} |
|
} |
|
; |
|
|
|
|
|
string_literal : STRING |
|
{ |
|
$$ = &StringLiteral{ |
|
Val: yylex.(*parser).unquoteString($1.Val), |
|
PosRange: $1.PositionRange(), |
|
} |
|
} |
|
; |
|
|
|
/* |
|
* Wrappers for optional arguments. |
|
*/ |
|
|
|
maybe_duration : /* empty */ |
|
{$$ = 0} |
|
| duration |
|
; |
|
|
|
maybe_grouping_labels: /* empty */ { $$ = nil } |
|
| grouping_labels |
|
; |
|
|
|
%%
|
|
|