mirror of
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bbd92b85da
For yacc generated parsers there is the convention to capitalize the names of item types provided by the lexer, which makes it easy to distinct lexer tokens (capitalized) from nonterminal symbols (not capitalized) in language grammars. This convention is also followed by the (non generated) go compiler (see https://golang.org/pkg/go/token/#Token). Part of the parser rewrite described in #6256. Signed-off-by: Tobias Guggenmos <tguggenm@redhat.com>
726 lines
16 KiB
Go
726 lines
16 KiB
Go
// Copyright 2015 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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package promql
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import (
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"testing"
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"github.com/prometheus/prometheus/util/testutil"
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)
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type testCase struct {
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input string
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expected []item
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fail bool
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seriesDesc bool // Whether to lex a series description.
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}
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var tests = []struct {
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name string
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tests []testCase
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}{
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{
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name: "common",
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tests: []testCase{
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{
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input: ",",
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expected: []item{{COMMA, 0, ","}},
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}, {
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input: "()",
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expected: []item{{LEFT_PAREN, 0, `(`}, {RIGHT_PAREN, 1, `)`}},
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}, {
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input: "{}",
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expected: []item{{LEFT_BRACE, 0, `{`}, {RIGHT_BRACE, 1, `}`}},
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}, {
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input: "[5m]",
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expected: []item{
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{LEFT_BRACKET, 0, `[`},
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{DURATION, 1, `5m`},
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{RIGHT_BRACKET, 3, `]`},
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},
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}, {
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input: "[ 5m]",
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expected: []item{
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{LEFT_BRACKET, 0, `[`},
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{DURATION, 2, `5m`},
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{RIGHT_BRACKET, 4, `]`},
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},
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}, {
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input: "[ 5m]",
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expected: []item{
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{LEFT_BRACKET, 0, `[`},
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{DURATION, 3, `5m`},
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{RIGHT_BRACKET, 5, `]`},
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},
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}, {
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input: "[ 5m ]",
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expected: []item{
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{LEFT_BRACKET, 0, `[`},
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{DURATION, 3, `5m`},
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{RIGHT_BRACKET, 6, `]`},
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},
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}, {
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input: "\r\n\r",
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expected: []item{},
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},
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},
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},
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{
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name: "numbers",
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tests: []testCase{
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{
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input: "1",
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expected: []item{{NUMBER, 0, "1"}},
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}, {
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input: "4.23",
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expected: []item{{NUMBER, 0, "4.23"}},
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}, {
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input: ".3",
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expected: []item{{NUMBER, 0, ".3"}},
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}, {
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input: "5.",
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expected: []item{{NUMBER, 0, "5."}},
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}, {
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input: "NaN",
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expected: []item{{NUMBER, 0, "NaN"}},
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}, {
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input: "nAN",
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expected: []item{{NUMBER, 0, "nAN"}},
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}, {
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input: "NaN 123",
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expected: []item{{NUMBER, 0, "NaN"}, {NUMBER, 4, "123"}},
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}, {
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input: "NaN123",
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expected: []item{{IDENTIFIER, 0, "NaN123"}},
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}, {
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input: "iNf",
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expected: []item{{NUMBER, 0, "iNf"}},
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}, {
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input: "Inf",
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expected: []item{{NUMBER, 0, "Inf"}},
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}, {
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input: "+Inf",
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expected: []item{{ADD, 0, "+"}, {NUMBER, 1, "Inf"}},
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}, {
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input: "+Inf 123",
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expected: []item{{ADD, 0, "+"}, {NUMBER, 1, "Inf"}, {NUMBER, 5, "123"}},
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}, {
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input: "-Inf",
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expected: []item{{SUB, 0, "-"}, {NUMBER, 1, "Inf"}},
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}, {
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input: "Infoo",
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expected: []item{{IDENTIFIER, 0, "Infoo"}},
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}, {
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input: "-Infoo",
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expected: []item{{SUB, 0, "-"}, {IDENTIFIER, 1, "Infoo"}},
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}, {
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input: "-Inf 123",
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expected: []item{{SUB, 0, "-"}, {NUMBER, 1, "Inf"}, {NUMBER, 5, "123"}},
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}, {
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input: "0x123",
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expected: []item{{NUMBER, 0, "0x123"}},
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},
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},
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},
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{
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name: "strings",
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tests: []testCase{
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{
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input: "\"test\\tsequence\"",
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expected: []item{{STRING, 0, `"test\tsequence"`}},
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},
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{
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input: "\"test\\\\.expression\"",
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expected: []item{{STRING, 0, `"test\\.expression"`}},
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},
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{
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input: "\"test\\.expression\"",
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expected: []item{
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{ERROR, 0, "unknown escape sequence U+002E '.'"},
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{STRING, 0, `"test\.expression"`},
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},
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},
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{
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input: "`test\\.expression`",
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expected: []item{{STRING, 0, "`test\\.expression`"}},
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},
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{
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// See https://github.com/prometheus/prometheus/issues/939.
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input: ".٩",
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fail: true,
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},
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},
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},
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{
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name: "durations",
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tests: []testCase{
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{
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input: "5s",
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expected: []item{{DURATION, 0, "5s"}},
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}, {
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input: "123m",
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expected: []item{{DURATION, 0, "123m"}},
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}, {
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input: "1h",
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expected: []item{{DURATION, 0, "1h"}},
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}, {
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input: "3w",
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expected: []item{{DURATION, 0, "3w"}},
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}, {
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input: "1y",
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expected: []item{{DURATION, 0, "1y"}},
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},
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},
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},
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{
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name: "identifiers",
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tests: []testCase{
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{
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input: "abc",
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expected: []item{{IDENTIFIER, 0, "abc"}},
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}, {
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input: "a:bc",
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expected: []item{{METRIC_IDENTIFIER, 0, "a:bc"}},
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}, {
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input: "abc d",
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expected: []item{{IDENTIFIER, 0, "abc"}, {IDENTIFIER, 4, "d"}},
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}, {
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input: ":bc",
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expected: []item{{METRIC_IDENTIFIER, 0, ":bc"}},
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}, {
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input: "0a:bc",
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fail: true,
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},
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},
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},
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{
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name: "comments",
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tests: []testCase{
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{
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input: "# some comment",
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expected: []item{{COMMENT, 0, "# some comment"}},
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}, {
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input: "5 # 1+1\n5",
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expected: []item{
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{NUMBER, 0, "5"},
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{COMMENT, 2, "# 1+1"},
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{NUMBER, 8, "5"},
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},
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},
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},
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},
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{
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name: "operators",
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tests: []testCase{
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{
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input: `=`,
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expected: []item{{ASSIGN, 0, `=`}},
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}, {
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// Inside braces equality is a single '=' character.
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input: `{=}`,
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expected: []item{{LEFT_BRACE, 0, `{`}, {EQL, 1, `=`}, {RIGHT_BRACE, 2, `}`}},
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}, {
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input: `==`,
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expected: []item{{EQL, 0, `==`}},
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}, {
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input: `!=`,
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expected: []item{{NEQ, 0, `!=`}},
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}, {
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input: `<`,
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expected: []item{{LSS, 0, `<`}},
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}, {
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input: `>`,
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expected: []item{{GTR, 0, `>`}},
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}, {
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input: `>=`,
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expected: []item{{GTE, 0, `>=`}},
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}, {
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input: `<=`,
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expected: []item{{LTE, 0, `<=`}},
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}, {
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input: `+`,
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expected: []item{{ADD, 0, `+`}},
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}, {
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input: `-`,
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expected: []item{{SUB, 0, `-`}},
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}, {
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input: `*`,
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expected: []item{{MUL, 0, `*`}},
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}, {
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input: `/`,
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expected: []item{{DIV, 0, `/`}},
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}, {
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input: `^`,
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expected: []item{{POW, 0, `^`}},
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}, {
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input: `%`,
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expected: []item{{MOD, 0, `%`}},
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}, {
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input: `AND`,
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expected: []item{{LAND, 0, `AND`}},
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}, {
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input: `or`,
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expected: []item{{LOR, 0, `or`}},
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}, {
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input: `unless`,
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expected: []item{{LUNLESS, 0, `unless`}},
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},
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},
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},
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{
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name: "aggregators",
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tests: []testCase{
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{
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input: `sum`,
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expected: []item{{SUM, 0, `sum`}},
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}, {
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input: `AVG`,
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expected: []item{{AVG, 0, `AVG`}},
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}, {
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input: `MAX`,
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expected: []item{{MAX, 0, `MAX`}},
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}, {
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input: `min`,
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expected: []item{{MIN, 0, `min`}},
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}, {
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input: `count`,
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expected: []item{{COUNT, 0, `count`}},
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}, {
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input: `stdvar`,
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expected: []item{{STDVAR, 0, `stdvar`}},
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}, {
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input: `stddev`,
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expected: []item{{STDDEV, 0, `stddev`}},
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},
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},
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},
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{
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name: "keywords",
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tests: []testCase{
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{
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input: "offset",
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expected: []item{{OFFSET, 0, "offset"}},
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}, {
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input: "by",
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expected: []item{{BY, 0, "by"}},
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}, {
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input: "without",
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expected: []item{{WITHOUT, 0, "without"}},
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}, {
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input: "on",
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expected: []item{{ON, 0, "on"}},
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}, {
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input: "ignoring",
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expected: []item{{IGNORING, 0, "ignoring"}},
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}, {
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input: "group_left",
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expected: []item{{GROUP_LEFT, 0, "group_left"}},
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}, {
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input: "group_right",
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expected: []item{{GROUP_RIGHT, 0, "group_right"}},
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}, {
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input: "bool",
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expected: []item{{BOOL, 0, "bool"}},
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},
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},
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},
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{
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name: "selectors",
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tests: []testCase{
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{
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input: `台北`,
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fail: true,
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}, {
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input: `{台北='a'}`,
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fail: true,
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}, {
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input: `{0a='a'}`,
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fail: true,
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}, {
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input: `{foo='bar'}`,
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expected: []item{
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{LEFT_BRACE, 0, `{`},
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{IDENTIFIER, 1, `foo`},
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{EQL, 4, `=`},
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{STRING, 5, `'bar'`},
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{RIGHT_BRACE, 10, `}`},
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},
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}, {
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input: `{foo="bar"}`,
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expected: []item{
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{LEFT_BRACE, 0, `{`},
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{IDENTIFIER, 1, `foo`},
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{EQL, 4, `=`},
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{STRING, 5, `"bar"`},
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{RIGHT_BRACE, 10, `}`},
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},
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}, {
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input: `{foo="bar\"bar"}`,
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expected: []item{
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{LEFT_BRACE, 0, `{`},
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{IDENTIFIER, 1, `foo`},
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{EQL, 4, `=`},
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{STRING, 5, `"bar\"bar"`},
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{RIGHT_BRACE, 15, `}`},
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},
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}, {
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input: `{NaN != "bar" }`,
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expected: []item{
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{LEFT_BRACE, 0, `{`},
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{IDENTIFIER, 1, `NaN`},
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{NEQ, 5, `!=`},
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{STRING, 8, `"bar"`},
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{RIGHT_BRACE, 14, `}`},
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},
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}, {
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input: `{alert=~"bar" }`,
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expected: []item{
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{LEFT_BRACE, 0, `{`},
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{IDENTIFIER, 1, `alert`},
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{EQL_REGEX, 6, `=~`},
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{STRING, 8, `"bar"`},
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{RIGHT_BRACE, 14, `}`},
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},
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}, {
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input: `{on!~"bar"}`,
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expected: []item{
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{LEFT_BRACE, 0, `{`},
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{IDENTIFIER, 1, `on`},
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{NEQ_REGEX, 3, `!~`},
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{STRING, 5, `"bar"`},
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{RIGHT_BRACE, 10, `}`},
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},
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}, {
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input: `{alert!#"bar"}`, fail: true,
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}, {
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input: `{foo:a="bar"}`, fail: true,
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},
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},
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},
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{
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name: "common errors",
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tests: []testCase{
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{
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input: `=~`, fail: true,
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}, {
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input: `!~`, fail: true,
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}, {
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input: `!(`, fail: true,
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}, {
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input: "1a", fail: true,
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},
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},
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},
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{
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name: "mismatched parentheses",
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tests: []testCase{
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{
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input: `(`, fail: true,
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}, {
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input: `())`, fail: true,
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}, {
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input: `(()`, fail: true,
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}, {
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input: `{`, fail: true,
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}, {
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input: `}`, fail: true,
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}, {
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input: "{{", fail: true,
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}, {
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input: "{{}}", fail: true,
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}, {
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input: `[`, fail: true,
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}, {
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input: `[[`, fail: true,
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}, {
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input: `[]]`, fail: true,
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}, {
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input: `[[]]`, fail: true,
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}, {
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input: `]`, fail: true,
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},
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},
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},
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{
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name: "encoding issues",
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tests: []testCase{
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{
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input: "\"\xff\"", fail: true,
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},
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{
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input: "`\xff`", fail: true,
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},
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},
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},
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{
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name: "series descriptions",
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tests: []testCase{
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{
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input: `{} _ 1 x .3`,
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expected: []item{
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{LEFT_BRACE, 0, `{`},
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{RIGHT_BRACE, 1, `}`},
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{SPACE, 2, ` `},
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{BLANK, 3, `_`},
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{SPACE, 4, ` `},
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{NUMBER, 5, `1`},
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{SPACE, 6, ` `},
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{TIMES, 7, `x`},
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{SPACE, 8, ` `},
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{NUMBER, 9, `.3`},
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},
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seriesDesc: true,
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},
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{
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input: `metric +Inf Inf NaN`,
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expected: []item{
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{IDENTIFIER, 0, `metric`},
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{SPACE, 6, ` `},
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{ADD, 7, `+`},
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{NUMBER, 8, `Inf`},
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{SPACE, 11, ` `},
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{NUMBER, 12, `Inf`},
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{SPACE, 15, ` `},
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{NUMBER, 16, `NaN`},
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},
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seriesDesc: true,
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},
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{
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input: `metric 1+1x4`,
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expected: []item{
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{IDENTIFIER, 0, `metric`},
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{SPACE, 6, ` `},
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{NUMBER, 7, `1`},
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{ADD, 8, `+`},
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{NUMBER, 9, `1`},
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{TIMES, 10, `x`},
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{NUMBER, 11, `4`},
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},
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seriesDesc: true,
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},
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},
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},
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{
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name: "subqueries",
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tests: []testCase{
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{
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input: `test_name{on!~"bar"}[4m:4s]`,
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expected: []item{
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{IDENTIFIER, 0, `test_name`},
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{LEFT_BRACE, 9, `{`},
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{IDENTIFIER, 10, `on`},
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{NEQ_REGEX, 12, `!~`},
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{STRING, 14, `"bar"`},
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{RIGHT_BRACE, 19, `}`},
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{LEFT_BRACKET, 20, `[`},
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{DURATION, 21, `4m`},
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{COLON, 23, `:`},
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{DURATION, 24, `4s`},
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{RIGHT_BRACKET, 26, `]`},
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},
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},
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{
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input: `test:name{on!~"bar"}[4m:4s]`,
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expected: []item{
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{METRIC_IDENTIFIER, 0, `test:name`},
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{LEFT_BRACE, 9, `{`},
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{IDENTIFIER, 10, `on`},
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{NEQ_REGEX, 12, `!~`},
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{STRING, 14, `"bar"`},
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{RIGHT_BRACE, 19, `}`},
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{LEFT_BRACKET, 20, `[`},
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{DURATION, 21, `4m`},
|
|
{COLON, 23, `:`},
|
|
{DURATION, 24, `4s`},
|
|
{RIGHT_BRACKET, 26, `]`},
|
|
},
|
|
}, {
|
|
input: `test:name{on!~"b:ar"}[4m:4s]`,
|
|
expected: []item{
|
|
{METRIC_IDENTIFIER, 0, `test:name`},
|
|
{LEFT_BRACE, 9, `{`},
|
|
{IDENTIFIER, 10, `on`},
|
|
{NEQ_REGEX, 12, `!~`},
|
|
{STRING, 14, `"b:ar"`},
|
|
{RIGHT_BRACE, 20, `}`},
|
|
{LEFT_BRACKET, 21, `[`},
|
|
{DURATION, 22, `4m`},
|
|
{COLON, 24, `:`},
|
|
{DURATION, 25, `4s`},
|
|
{RIGHT_BRACKET, 27, `]`},
|
|
},
|
|
}, {
|
|
input: `test:name{on!~"b:ar"}[4m:]`,
|
|
expected: []item{
|
|
{METRIC_IDENTIFIER, 0, `test:name`},
|
|
{LEFT_BRACE, 9, `{`},
|
|
{IDENTIFIER, 10, `on`},
|
|
{NEQ_REGEX, 12, `!~`},
|
|
{STRING, 14, `"b:ar"`},
|
|
{RIGHT_BRACE, 20, `}`},
|
|
{LEFT_BRACKET, 21, `[`},
|
|
{DURATION, 22, `4m`},
|
|
{COLON, 24, `:`},
|
|
{RIGHT_BRACKET, 25, `]`},
|
|
},
|
|
}, { // Nested Subquery.
|
|
input: `min_over_time(rate(foo{bar="baz"}[2s])[5m:])[4m:3s]`,
|
|
expected: []item{
|
|
|
|
{IDENTIFIER, 0, `min_over_time`},
|
|
{LEFT_PAREN, 13, `(`},
|
|
{IDENTIFIER, 14, `rate`},
|
|
{LEFT_PAREN, 18, `(`},
|
|
{IDENTIFIER, 19, `foo`},
|
|
{LEFT_BRACE, 22, `{`},
|
|
{IDENTIFIER, 23, `bar`},
|
|
{EQL, 26, `=`},
|
|
{STRING, 27, `"baz"`},
|
|
{RIGHT_BRACE, 32, `}`},
|
|
{LEFT_BRACKET, 33, `[`},
|
|
{DURATION, 34, `2s`},
|
|
{RIGHT_BRACKET, 36, `]`},
|
|
{RIGHT_PAREN, 37, `)`},
|
|
{LEFT_BRACKET, 38, `[`},
|
|
{DURATION, 39, `5m`},
|
|
{COLON, 41, `:`},
|
|
{RIGHT_BRACKET, 42, `]`},
|
|
{RIGHT_PAREN, 43, `)`},
|
|
{LEFT_BRACKET, 44, `[`},
|
|
{DURATION, 45, `4m`},
|
|
{COLON, 47, `:`},
|
|
{DURATION, 48, `3s`},
|
|
{RIGHT_BRACKET, 50, `]`},
|
|
},
|
|
},
|
|
// Subquery with offset.
|
|
{
|
|
input: `test:name{on!~"b:ar"}[4m:4s] offset 10m`,
|
|
expected: []item{
|
|
{METRIC_IDENTIFIER, 0, `test:name`},
|
|
{LEFT_BRACE, 9, `{`},
|
|
{IDENTIFIER, 10, `on`},
|
|
{NEQ_REGEX, 12, `!~`},
|
|
{STRING, 14, `"b:ar"`},
|
|
{RIGHT_BRACE, 20, `}`},
|
|
{LEFT_BRACKET, 21, `[`},
|
|
{DURATION, 22, `4m`},
|
|
{COLON, 24, `:`},
|
|
{DURATION, 25, `4s`},
|
|
{RIGHT_BRACKET, 27, `]`},
|
|
{OFFSET, 29, "offset"},
|
|
{DURATION, 36, "10m"},
|
|
},
|
|
}, {
|
|
input: `min_over_time(rate(foo{bar="baz"}[2s])[5m:] offset 6m)[4m:3s]`,
|
|
expected: []item{
|
|
|
|
{IDENTIFIER, 0, `min_over_time`},
|
|
{LEFT_PAREN, 13, `(`},
|
|
{IDENTIFIER, 14, `rate`},
|
|
{LEFT_PAREN, 18, `(`},
|
|
{IDENTIFIER, 19, `foo`},
|
|
{LEFT_BRACE, 22, `{`},
|
|
{IDENTIFIER, 23, `bar`},
|
|
{EQL, 26, `=`},
|
|
{STRING, 27, `"baz"`},
|
|
{RIGHT_BRACE, 32, `}`},
|
|
{LEFT_BRACKET, 33, `[`},
|
|
{DURATION, 34, `2s`},
|
|
{RIGHT_BRACKET, 36, `]`},
|
|
{RIGHT_PAREN, 37, `)`},
|
|
{LEFT_BRACKET, 38, `[`},
|
|
{DURATION, 39, `5m`},
|
|
{COLON, 41, `:`},
|
|
{RIGHT_BRACKET, 42, `]`},
|
|
{OFFSET, 44, `offset`},
|
|
{DURATION, 51, `6m`},
|
|
{RIGHT_PAREN, 53, `)`},
|
|
{LEFT_BRACKET, 54, `[`},
|
|
{DURATION, 55, `4m`},
|
|
{COLON, 57, `:`},
|
|
{DURATION, 58, `3s`},
|
|
{RIGHT_BRACKET, 60, `]`},
|
|
},
|
|
},
|
|
{
|
|
input: `test:name[ 5m]`,
|
|
expected: []item{
|
|
{METRIC_IDENTIFIER, 0, `test:name`},
|
|
{LEFT_BRACKET, 9, `[`},
|
|
{DURATION, 11, `5m`},
|
|
{RIGHT_BRACKET, 13, `]`},
|
|
},
|
|
},
|
|
{
|
|
input: `test:name{o:n!~"bar"}[4m:4s]`,
|
|
fail: true,
|
|
},
|
|
{
|
|
input: `test:name{on!~"bar"}[4m:4s:4h]`,
|
|
fail: true,
|
|
},
|
|
{
|
|
input: `test:name{on!~"bar"}[4m:4s:]`,
|
|
fail: true,
|
|
},
|
|
{
|
|
input: `test:name{on!~"bar"}[4m::]`,
|
|
fail: true,
|
|
},
|
|
{
|
|
input: `test:name{on!~"bar"}[:4s]`,
|
|
fail: true,
|
|
},
|
|
},
|
|
},
|
|
}
|
|
|
|
// TestLexer tests basic functionality of the lexer. More elaborate tests are implemented
|
|
// for the parser to avoid duplicated effort.
|
|
func TestLexer(t *testing.T) {
|
|
for _, typ := range tests {
|
|
t.Run(typ.name, func(t *testing.T) {
|
|
for i, test := range typ.tests {
|
|
l := &lexer{
|
|
input: test.input,
|
|
seriesDesc: test.seriesDesc,
|
|
}
|
|
l.run()
|
|
|
|
out := l.items
|
|
|
|
lastItem := out[len(out)-1]
|
|
if test.fail {
|
|
if lastItem.typ != ERROR {
|
|
t.Logf("%d: input %q", i, test.input)
|
|
t.Fatalf("expected lexing error but did not fail")
|
|
}
|
|
continue
|
|
}
|
|
if lastItem.typ == ERROR {
|
|
t.Logf("%d: input %q", i, test.input)
|
|
t.Fatalf("unexpected lexing error at position %d: %s", lastItem.pos, lastItem)
|
|
}
|
|
|
|
eofItem := item{EOF, Pos(len(test.input)), ""}
|
|
testutil.Equals(t, lastItem, eofItem, "%d: input %q", i, test.input)
|
|
|
|
out = out[:len(out)-1]
|
|
testutil.Equals(t, out, test.expected, "%d: input %q", i, test.input)
|
|
}
|
|
})
|
|
}
|
|
}
|