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489 lines
11 KiB
489 lines
11 KiB
// 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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"fmt"
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"reflect"
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"testing"
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)
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var tests = []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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// Test common stuff.
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{
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input: ",",
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expected: []item{{itemComma, 0, ","}},
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}, {
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input: "()",
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expected: []item{{itemLeftParen, 0, `(`}, {itemRightParen, 1, `)`}},
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}, {
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input: "{}",
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expected: []item{{itemLeftBrace, 0, `{`}, {itemRightBrace, 1, `}`}},
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}, {
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input: "[5m]",
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expected: []item{
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{itemLeftBracket, 0, `[`},
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{itemDuration, 1, `5m`},
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{itemRightBracket, 3, `]`},
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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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// Test numbers.
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{
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input: "1",
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expected: []item{{itemNumber, 0, "1"}},
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}, {
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input: "4.23",
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expected: []item{{itemNumber, 0, "4.23"}},
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}, {
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input: ".3",
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expected: []item{{itemNumber, 0, ".3"}},
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}, {
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input: "5.",
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expected: []item{{itemNumber, 0, "5."}},
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}, {
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input: "NaN",
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expected: []item{{itemNumber, 0, "NaN"}},
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}, {
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input: "nAN",
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expected: []item{{itemNumber, 0, "nAN"}},
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}, {
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input: "NaN 123",
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expected: []item{{itemNumber, 0, "NaN"}, {itemNumber, 4, "123"}},
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}, {
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input: "NaN123",
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expected: []item{{itemIdentifier, 0, "NaN123"}},
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}, {
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input: "iNf",
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expected: []item{{itemNumber, 0, "iNf"}},
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}, {
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input: "Inf",
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expected: []item{{itemNumber, 0, "Inf"}},
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}, {
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input: "+Inf",
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expected: []item{{itemADD, 0, "+"}, {itemNumber, 1, "Inf"}},
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}, {
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input: "+Inf 123",
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expected: []item{{itemADD, 0, "+"}, {itemNumber, 1, "Inf"}, {itemNumber, 5, "123"}},
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}, {
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input: "-Inf",
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expected: []item{{itemSUB, 0, "-"}, {itemNumber, 1, "Inf"}},
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}, {
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input: "Infoo",
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expected: []item{{itemIdentifier, 0, "Infoo"}},
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}, {
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input: "-Infoo",
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expected: []item{{itemSUB, 0, "-"}, {itemIdentifier, 1, "Infoo"}},
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}, {
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input: "-Inf 123",
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expected: []item{{itemSUB, 0, "-"}, {itemNumber, 1, "Inf"}, {itemNumber, 5, "123"}},
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}, {
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input: "0x123",
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expected: []item{{itemNumber, 0, "0x123"}},
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},
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// Test strings.
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{
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input: "\"test\\tsequence\"",
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expected: []item{{itemString, 0, `"test\tsequence"`}},
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},
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{
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input: "\"test\\\\.expression\"",
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expected: []item{{itemString, 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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{itemError, 0, "unknown escape sequence U+002E '.'"},
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{itemString, 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{{itemString, 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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// Test duration.
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{
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input: "5s",
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expected: []item{{itemDuration, 0, "5s"}},
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}, {
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input: "123m",
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expected: []item{{itemDuration, 0, "123m"}},
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}, {
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input: "1h",
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expected: []item{{itemDuration, 0, "1h"}},
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}, {
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input: "3w",
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expected: []item{{itemDuration, 0, "3w"}},
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}, {
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input: "1y",
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expected: []item{{itemDuration, 0, "1y"}},
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},
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// Test identifiers.
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{
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input: "abc",
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expected: []item{{itemIdentifier, 0, "abc"}},
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}, {
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input: "a:bc",
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expected: []item{{itemMetricIdentifier, 0, "a:bc"}},
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}, {
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input: "abc d",
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expected: []item{{itemIdentifier, 0, "abc"}, {itemIdentifier, 4, "d"}},
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}, {
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input: ":bc",
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expected: []item{{itemMetricIdentifier, 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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// Test comments.
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{
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input: "# some comment",
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expected: []item{{itemComment, 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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{itemNumber, 0, "5"},
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{itemComment, 2, "# 1+1"},
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{itemNumber, 8, "5"},
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},
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},
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// Test operators.
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{
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input: `=`,
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expected: []item{{itemAssign, 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{{itemLeftBrace, 0, `{`}, {itemEQL, 1, `=`}, {itemRightBrace, 2, `}`}},
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}, {
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input: `==`,
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expected: []item{{itemEQL, 0, `==`}},
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}, {
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input: `!=`,
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expected: []item{{itemNEQ, 0, `!=`}},
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}, {
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input: `<`,
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expected: []item{{itemLSS, 0, `<`}},
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}, {
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input: `>`,
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expected: []item{{itemGTR, 0, `>`}},
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}, {
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input: `>=`,
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expected: []item{{itemGTE, 0, `>=`}},
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}, {
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input: `<=`,
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expected: []item{{itemLTE, 0, `<=`}},
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}, {
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input: `+`,
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expected: []item{{itemADD, 0, `+`}},
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}, {
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input: `-`,
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expected: []item{{itemSUB, 0, `-`}},
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}, {
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input: `*`,
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expected: []item{{itemMUL, 0, `*`}},
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}, {
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input: `/`,
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expected: []item{{itemDIV, 0, `/`}},
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}, {
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input: `^`,
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expected: []item{{itemPOW, 0, `^`}},
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}, {
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input: `%`,
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expected: []item{{itemMOD, 0, `%`}},
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}, {
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input: `AND`,
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expected: []item{{itemLAND, 0, `AND`}},
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}, {
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input: `or`,
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expected: []item{{itemLOR, 0, `or`}},
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}, {
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input: `unless`,
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expected: []item{{itemLUnless, 0, `unless`}},
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},
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// Test aggregators.
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{
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input: `sum`,
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expected: []item{{itemSum, 0, `sum`}},
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}, {
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input: `AVG`,
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expected: []item{{itemAvg, 0, `AVG`}},
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}, {
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input: `MAX`,
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expected: []item{{itemMax, 0, `MAX`}},
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}, {
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input: `min`,
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expected: []item{{itemMin, 0, `min`}},
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}, {
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input: `count`,
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expected: []item{{itemCount, 0, `count`}},
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}, {
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input: `stdvar`,
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expected: []item{{itemStdvar, 0, `stdvar`}},
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}, {
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input: `stddev`,
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expected: []item{{itemStddev, 0, `stddev`}},
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},
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// Test keywords.
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{
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input: "alert",
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expected: []item{{itemAlert, 0, "alert"}},
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}, {
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input: "if",
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expected: []item{{itemIf, 0, "if"}},
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}, {
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input: "for",
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expected: []item{{itemFor, 0, "for"}},
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}, {
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input: "labels",
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expected: []item{{itemLabels, 0, "labels"}},
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}, {
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input: "annotations",
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expected: []item{{itemAnnotations, 0, "annotations"}},
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}, {
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input: "offset",
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expected: []item{{itemOffset, 0, "offset"}},
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}, {
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input: "by",
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expected: []item{{itemBy, 0, "by"}},
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}, {
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input: "without",
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expected: []item{{itemWithout, 0, "without"}},
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}, {
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input: "on",
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expected: []item{{itemOn, 0, "on"}},
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}, {
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input: "ignoring",
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expected: []item{{itemIgnoring, 0, "ignoring"}},
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}, {
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input: "group_left",
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expected: []item{{itemGroupLeft, 0, "group_left"}},
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}, {
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input: "group_right",
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expected: []item{{itemGroupRight, 0, "group_right"}},
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}, {
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input: "bool",
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expected: []item{{itemBool, 0, "bool"}},
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},
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// Test Selector.
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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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{itemLeftBrace, 0, `{`},
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{itemIdentifier, 1, `foo`},
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{itemEQL, 4, `=`},
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{itemString, 5, `'bar'`},
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{itemRightBrace, 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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{itemLeftBrace, 0, `{`},
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{itemIdentifier, 1, `foo`},
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{itemEQL, 4, `=`},
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{itemString, 5, `"bar"`},
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{itemRightBrace, 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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{itemLeftBrace, 0, `{`},
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{itemIdentifier, 1, `foo`},
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{itemEQL, 4, `=`},
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{itemString, 5, `"bar\"bar"`},
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{itemRightBrace, 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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{itemLeftBrace, 0, `{`},
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{itemIdentifier, 1, `NaN`},
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{itemNEQ, 5, `!=`},
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{itemString, 8, `"bar"`},
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{itemRightBrace, 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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{itemLeftBrace, 0, `{`},
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{itemIdentifier, 1, `alert`},
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{itemEQLRegex, 6, `=~`},
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{itemString, 8, `"bar"`},
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{itemRightBrace, 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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{itemLeftBrace, 0, `{`},
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{itemIdentifier, 1, `on`},
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{itemNEQRegex, 3, `!~`},
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{itemString, 5, `"bar"`},
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{itemRightBrace, 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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// Test common errors.
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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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// Test mismatched parens.
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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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// Test encoding issues.
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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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// Test series description.
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{
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input: `{} _ 1 x .3`,
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expected: []item{
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{itemLeftBrace, 0, `{`},
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{itemRightBrace, 1, `}`},
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{itemBlank, 3, `_`},
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{itemNumber, 5, `1`},
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{itemTimes, 7, `x`},
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{itemNumber, 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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{itemIdentifier, 0, `metric`},
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{itemADD, 7, `+`},
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{itemNumber, 8, `Inf`},
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{itemNumber, 12, `Inf`},
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{itemNumber, 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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{itemIdentifier, 0, `metric`},
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{itemNumber, 7, `1`},
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{itemADD, 8, `+`},
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{itemNumber, 9, `1`},
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{itemTimes, 10, `x`},
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{itemNumber, 11, `4`},
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},
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seriesDesc: true,
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},
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}
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// TestLexer tests basic functionality of the lexer. More elaborate tests are implemented
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// for the parser to avoid duplicated effort.
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func TestLexer(t *testing.T) {
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for i, test := range tests {
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l := &lexer{
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input: test.input,
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items: make(chan item),
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seriesDesc: test.seriesDesc,
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}
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go l.run()
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out := []item{}
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for it := range l.items {
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out = append(out, it)
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}
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lastItem := out[len(out)-1]
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if test.fail {
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if lastItem.typ != itemError {
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t.Logf("%d: input %q", i, test.input)
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t.Fatalf("expected lexing error but did not fail")
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}
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continue
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}
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if lastItem.typ == itemError {
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t.Logf("%d: input %q", i, test.input)
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t.Fatalf("unexpected lexing error at position %d: %s", lastItem.pos, lastItem)
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}
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if !reflect.DeepEqual(lastItem, item{itemEOF, Pos(len(test.input)), ""}) {
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t.Logf("%d: input %q", i, test.input)
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t.Fatalf("lexing error: expected output to end with EOF item.\ngot:\n%s", expectedList(out))
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}
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out = out[:len(out)-1]
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if !reflect.DeepEqual(out, test.expected) {
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t.Logf("%d: input %q", i, test.input)
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t.Fatalf("lexing mismatch:\nexpected:\n%s\ngot:\n%s", expectedList(test.expected), expectedList(out))
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}
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}
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}
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func expectedList(exp []item) string {
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s := ""
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for _, it := range exp {
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s += fmt.Sprintf("\t%#v\n", it)
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}
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return s
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}
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