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750 lines
25 KiB
750 lines
25 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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"github.com/prometheus/prometheus/model/labels"
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"github.com/prometheus/prometheus/model/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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AT
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ATAN2
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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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// Preprocessors.
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%token preprocessorStart
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%token <item>
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START
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END
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%token preprocessorEnd
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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 at_modifier_preprocessors
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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 signed_or_unsigned_number
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%type <node> step_invariant_expr 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 ATAN2
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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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| step_invariant_expr
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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 { $$ = yylex.(*parser).newBinaryExpression($1, $2, $3, $4) }
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| expr ATAN2 bin_modifier expr { $$ = 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 SUB duration
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{
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yylex.(*parser).addOffset($1, -$4)
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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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* @ modifiers.
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*/
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step_invariant_expr: expr AT signed_or_unsigned_number
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{
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yylex.(*parser).setTimestamp($1, $3)
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$$ = $1
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}
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| expr AT at_modifier_preprocessors LEFT_PAREN RIGHT_PAREN
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{
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yylex.(*parser).setAtModifierPreprocessor($1, $3)
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$$ = $1
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}
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| expr AT error
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{ yylex.(*parser).unexpected("@", "timestamp"); $$ = $1 }
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;
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at_modifier_preprocessors: START | END;
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/*
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* Subquery and range selectors.
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*/
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matrix_selector : expr LEFT_BRACKET duration RIGHT_BRACKET
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{
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var errMsg string
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vs, ok := $1.(*VectorSelector)
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if !ok{
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errMsg = "ranges only allowed for vector selectors"
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} else if vs.OriginalOffset != 0{
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errMsg = "no offset modifiers allowed before range"
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} else if vs.Timestamp != nil {
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errMsg = "no @ modifiers allowed before range"
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}
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if errMsg != ""{
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errRange := mergeRanges(&$2, &$4)
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yylex.(*parser).addParseErrf(errRange, errMsg)
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}
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$$ = &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 \"}\""); $$ = $1 }
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;
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label_matcher : IDENTIFIER match_op STRING
|
|
{ $$ = yylex.(*parser).newLabelMatcher($1, $2, $3); }
|
|
| IDENTIFIER match_op error
|
|
{ yylex.(*parser).unexpected("label matching", "string"); $$ = nil}
|
|
| IDENTIFIER error
|
|
{ yylex.(*parser).unexpected("label matching", "label matching operator"); $$ = nil }
|
|
| error
|
|
{ yylex.(*parser).unexpected("label matching", "identifier or \"}\""); $$ = nil}
|
|
;
|
|
|
|
/*
|
|
* Metric descriptions.
|
|
*/
|
|
|
|
metric : metric_identifier label_set
|
|
{ $$ = append($2, labels.Label{Name: labels.MetricName, Value: $1.Val}); sort.Sort($$) }
|
|
| label_set
|
|
{$$ = $1}
|
|
;
|
|
|
|
|
|
metric_identifier: AVG | BOTTOMK | BY | COUNT | COUNT_VALUES | GROUP | IDENTIFIER | LAND | LOR | LUNLESS | MAX | METRIC_IDENTIFIER | MIN | OFFSET | QUANTILE | STDDEV | STDVAR | SUM | TOPK | WITHOUT | START | END;
|
|
|
|
label_set : LEFT_BRACE label_set_list RIGHT_BRACE
|
|
{ $$ = labels.New($2...) }
|
|
| LEFT_BRACE label_set_list COMMA RIGHT_BRACE
|
|
{ $$ = labels.New($2...) }
|
|
| LEFT_BRACE RIGHT_BRACE
|
|
{ $$ = labels.New() }
|
|
| /* empty */
|
|
{ $$ = labels.New() }
|
|
;
|
|
|
|
label_set_list : label_set_list COMMA label_set_item
|
|
{ $$ = append($1, $3) }
|
|
| label_set_item
|
|
{ $$ = []labels.Label{$1} }
|
|
| label_set_list error
|
|
{ yylex.(*parser).unexpected("label set", "\",\" or \"}\"", ); $$ = $1 }
|
|
|
|
;
|
|
|
|
label_set_item : IDENTIFIER EQL STRING
|
|
{ $$ = labels.Label{Name: $1.Val, Value: yylex.(*parser).unquoteString($3.Val) } }
|
|
| IDENTIFIER EQL error
|
|
{ yylex.(*parser).unexpected("label set", "string"); $$ = labels.Label{}}
|
|
| IDENTIFIER error
|
|
{ yylex.(*parser).unexpected("label set", "\"=\""); $$ = labels.Label{}}
|
|
| error
|
|
{ yylex.(*parser).unexpected("label set", "identifier or \"}\""); $$ = labels.Label{} }
|
|
;
|
|
|
|
/*
|
|
* Series descriptions (only used by unit tests).
|
|
*/
|
|
|
|
series_description: metric series_values
|
|
{
|
|
yylex.(*parser).generatedParserResult = &seriesDescription{
|
|
labels: $1,
|
|
values: $2,
|
|
}
|
|
}
|
|
;
|
|
|
|
series_values : /*empty*/
|
|
{ $$ = []SequenceValue{} }
|
|
| series_values SPACE series_item
|
|
{ $$ = append($1, $3...) }
|
|
| series_values SPACE
|
|
{ $$ = $1 }
|
|
| error
|
|
{ yylex.(*parser).unexpected("series values", ""); $$ = nil }
|
|
;
|
|
|
|
series_item : BLANK
|
|
{ $$ = []SequenceValue{{Omitted: true}}}
|
|
| BLANK TIMES uint
|
|
{
|
|
$$ = []SequenceValue{}
|
|
for i:=uint64(0); i < $3; i++{
|
|
$$ = append($$, SequenceValue{Omitted: true})
|
|
}
|
|
}
|
|
| series_value
|
|
{ $$ = []SequenceValue{{Value: $1}}}
|
|
| series_value TIMES uint
|
|
{
|
|
$$ = []SequenceValue{}
|
|
for i:=uint64(0); i <= $3; i++{
|
|
$$ = append($$, SequenceValue{Value: $1})
|
|
}
|
|
}
|
|
| series_value signed_number TIMES uint
|
|
{
|
|
$$ = []SequenceValue{}
|
|
for i:=uint64(0); i <= $4; i++{
|
|
$$ = append($$, SequenceValue{Value: $1})
|
|
$1 += $2
|
|
}
|
|
}
|
|
;
|
|
|
|
series_value : IDENTIFIER
|
|
{
|
|
if $1.Val != "stale" {
|
|
yylex.(*parser).unexpected("series values", "number or \"stale\"")
|
|
}
|
|
$$ = math.Float64frombits(value.StaleNaN)
|
|
}
|
|
| number
|
|
| signed_number
|
|
;
|
|
|
|
|
|
|
|
|
|
/*
|
|
* Keyword lists.
|
|
*/
|
|
|
|
aggregate_op : AVG | BOTTOMK | COUNT | COUNT_VALUES | GROUP | MAX | MIN | QUANTILE | STDDEV | STDVAR | SUM | TOPK ;
|
|
|
|
// inside of grouping options label names can be recognized as keywords by the lexer. This is a list of keywords that could also be a label name.
|
|
maybe_label : AVG | BOOL | BOTTOMK | BY | COUNT | COUNT_VALUES | GROUP | GROUP_LEFT | GROUP_RIGHT | IDENTIFIER | IGNORING | LAND | LOR | LUNLESS | MAX | METRIC_IDENTIFIER | MIN | OFFSET | ON | QUANTILE | STDDEV | STDVAR | SUM | TOPK | START | END | ATAN2;
|
|
|
|
unary_op : ADD | SUB;
|
|
|
|
match_op : EQL | NEQ | EQL_REGEX | NEQ_REGEX ;
|
|
|
|
/*
|
|
* Literals.
|
|
*/
|
|
|
|
number_literal : NUMBER
|
|
{
|
|
$$ = &NumberLiteral{
|
|
Val: yylex.(*parser).number($1.Val),
|
|
PosRange: $1.PositionRange(),
|
|
}
|
|
}
|
|
;
|
|
|
|
number : NUMBER { $$ = yylex.(*parser).number($1.Val) } ;
|
|
|
|
signed_number : ADD number { $$ = $2 }
|
|
| SUB number { $$ = -$2 }
|
|
;
|
|
|
|
signed_or_unsigned_number: number | signed_number ;
|
|
|
|
uint : NUMBER
|
|
{
|
|
var err error
|
|
$$, 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
|
|
;
|
|
|
|
%%
|