prometheus/promql/lex_test.go

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// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package promql
import (
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"fmt"
"reflect"
"testing"
)
var tests = []struct {
input string
expected []item
fail bool
seriesDesc bool // Whether to lex a series description.
}{
// Test common stuff.
{
input: ",",
expected: []item{{itemComma, 0, ","}},
}, {
input: "()",
expected: []item{{itemLeftParen, 0, `(`}, {itemRightParen, 1, `)`}},
}, {
input: "{}",
expected: []item{{itemLeftBrace, 0, `{`}, {itemRightBrace, 1, `}`}},
}, {
input: "[5m]",
expected: []item{
{itemLeftBracket, 0, `[`},
{itemDuration, 1, `5m`},
{itemRightBracket, 3, `]`},
},
}, {
input: "\r\n\r",
expected: []item{},
},
// Test numbers.
{
input: "1",
expected: []item{{itemNumber, 0, "1"}},
}, {
input: "4.23",
expected: []item{{itemNumber, 0, "4.23"}},
}, {
input: ".3",
expected: []item{{itemNumber, 0, ".3"}},
}, {
input: "5.",
expected: []item{{itemNumber, 0, "5."}},
}, {
input: "NaN",
expected: []item{{itemNumber, 0, "NaN"}},
}, {
input: "nAN",
expected: []item{{itemNumber, 0, "nAN"}},
}, {
input: "NaN 123",
expected: []item{{itemNumber, 0, "NaN"}, {itemNumber, 4, "123"}},
}, {
input: "NaN123",
expected: []item{{itemIdentifier, 0, "NaN123"}},
}, {
input: "iNf",
expected: []item{{itemNumber, 0, "iNf"}},
}, {
input: "Inf",
expected: []item{{itemNumber, 0, "Inf"}},
}, {
input: "+Inf",
expected: []item{{itemADD, 0, "+"}, {itemNumber, 1, "Inf"}},
}, {
input: "+Inf 123",
expected: []item{{itemADD, 0, "+"}, {itemNumber, 1, "Inf"}, {itemNumber, 5, "123"}},
}, {
input: "-Inf",
expected: []item{{itemSUB, 0, "-"}, {itemNumber, 1, "Inf"}},
}, {
input: "Infoo",
expected: []item{{itemIdentifier, 0, "Infoo"}},
}, {
input: "-Infoo",
expected: []item{{itemSUB, 0, "-"}, {itemIdentifier, 1, "Infoo"}},
}, {
input: "-Inf 123",
expected: []item{{itemSUB, 0, "-"}, {itemNumber, 1, "Inf"}, {itemNumber, 5, "123"}},
}, {
input: "0x123",
expected: []item{{itemNumber, 0, "0x123"}},
},
// Test strings.
{
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input: "\"test\\tsequence\"",
expected: []item{{itemString, 0, `"test\tsequence"`}},
},
{
input: "\"test\\\\.expression\"",
expected: []item{{itemString, 0, `"test\\.expression"`}},
},
{
input: "\"test\\.expression\"",
expected: []item{
{itemError, 0, "unknown escape sequence U+002E '.'"},
{itemString, 0, `"test\.expression"`},
},
},
{
input: "`test\\.expression`",
expected: []item{{itemString, 0, "`test\\.expression`"}},
},
{
// See https://github.com/prometheus/prometheus/issues/939.
input: ".٩",
fail: true,
},
// Test duration.
{
input: "5s",
expected: []item{{itemDuration, 0, "5s"}},
}, {
input: "123m",
expected: []item{{itemDuration, 0, "123m"}},
}, {
input: "1h",
expected: []item{{itemDuration, 0, "1h"}},
}, {
input: "3w",
expected: []item{{itemDuration, 0, "3w"}},
}, {
input: "1y",
expected: []item{{itemDuration, 0, "1y"}},
},
// Test identifiers.
{
input: "abc",
expected: []item{{itemIdentifier, 0, "abc"}},
}, {
input: "a:bc",
expected: []item{{itemMetricIdentifier, 0, "a:bc"}},
}, {
input: "abc d",
expected: []item{{itemIdentifier, 0, "abc"}, {itemIdentifier, 4, "d"}},
}, {
input: ":bc",
expected: []item{{itemMetricIdentifier, 0, ":bc"}},
}, {
input: "0a:bc",
fail: true,
},
// Test comments.
{
input: "# some comment",
expected: []item{{itemComment, 0, "# some comment"}},
}, {
input: "5 # 1+1\n5",
expected: []item{
{itemNumber, 0, "5"},
{itemComment, 2, "# 1+1"},
{itemNumber, 8, "5"},
},
},
// Test operators.
{
input: `=`,
expected: []item{{itemAssign, 0, `=`}},
}, {
// Inside braces equality is a single '=' character.
input: `{=}`,
expected: []item{{itemLeftBrace, 0, `{`}, {itemEQL, 1, `=`}, {itemRightBrace, 2, `}`}},
}, {
input: `==`,
expected: []item{{itemEQL, 0, `==`}},
}, {
input: `!=`,
expected: []item{{itemNEQ, 0, `!=`}},
}, {
input: `<`,
expected: []item{{itemLSS, 0, `<`}},
}, {
input: `>`,
expected: []item{{itemGTR, 0, `>`}},
}, {
input: `>=`,
expected: []item{{itemGTE, 0, `>=`}},
}, {
input: `<=`,
expected: []item{{itemLTE, 0, `<=`}},
}, {
input: `+`,
expected: []item{{itemADD, 0, `+`}},
}, {
input: `-`,
expected: []item{{itemSUB, 0, `-`}},
}, {
input: `*`,
expected: []item{{itemMUL, 0, `*`}},
}, {
input: `/`,
expected: []item{{itemDIV, 0, `/`}},
}, {
input: `%`,
expected: []item{{itemMOD, 0, `%`}},
}, {
input: `AND`,
expected: []item{{itemLAND, 0, `AND`}},
}, {
input: `or`,
expected: []item{{itemLOR, 0, `or`}},
}, {
input: `unless`,
expected: []item{{itemLUnless, 0, `unless`}},
},
// Test aggregators.
{
input: `sum`,
expected: []item{{itemSum, 0, `sum`}},
}, {
input: `AVG`,
expected: []item{{itemAvg, 0, `AVG`}},
}, {
input: `MAX`,
expected: []item{{itemMax, 0, `MAX`}},
}, {
input: `min`,
expected: []item{{itemMin, 0, `min`}},
}, {
input: `count`,
expected: []item{{itemCount, 0, `count`}},
}, {
input: `stdvar`,
expected: []item{{itemStdvar, 0, `stdvar`}},
}, {
input: `stddev`,
expected: []item{{itemStddev, 0, `stddev`}},
},
// Test keywords.
{
input: "alert",
expected: []item{{itemAlert, 0, "alert"}},
}, {
input: "keep_common",
expected: []item{{itemKeepCommon, 0, "keep_common"}},
}, {
input: "if",
expected: []item{{itemIf, 0, "if"}},
}, {
input: "for",
expected: []item{{itemFor, 0, "for"}},
}, {
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input: "labels",
expected: []item{{itemLabels, 0, "labels"}},
}, {
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input: "annotations",
expected: []item{{itemAnnotations, 0, "annotations"}},
}, {
input: "offset",
expected: []item{{itemOffset, 0, "offset"}},
}, {
input: "by",
expected: []item{{itemBy, 0, "by"}},
}, {
input: "without",
expected: []item{{itemWithout, 0, "without"}},
}, {
input: "on",
expected: []item{{itemOn, 0, "on"}},
}, {
input: "ignoring",
expected: []item{{itemIgnoring, 0, "ignoring"}},
}, {
input: "group_left",
expected: []item{{itemGroupLeft, 0, "group_left"}},
}, {
input: "group_right",
expected: []item{{itemGroupRight, 0, "group_right"}},
}, {
input: "bool",
expected: []item{{itemBool, 0, "bool"}},
},
// Test Selector.
{
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input: `台北`,
fail: true,
}, {
input: `{台北='a'}`,
fail: true,
}, {
input: `{0a='a'}`,
fail: true,
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}, {
input: `{foo='bar'}`,
expected: []item{
{itemLeftBrace, 0, `{`},
{itemIdentifier, 1, `foo`},
{itemEQL, 4, `=`},
{itemString, 5, `'bar'`},
{itemRightBrace, 10, `}`},
},
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}, {
input: `{foo="bar"}`,
expected: []item{
{itemLeftBrace, 0, `{`},
{itemIdentifier, 1, `foo`},
{itemEQL, 4, `=`},
{itemString, 5, `"bar"`},
{itemRightBrace, 10, `}`},
},
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}, {
input: `{foo="bar\"bar"}`,
expected: []item{
{itemLeftBrace, 0, `{`},
{itemIdentifier, 1, `foo`},
{itemEQL, 4, `=`},
{itemString, 5, `"bar\"bar"`},
{itemRightBrace, 15, `}`},
},
}, {
input: `{NaN != "bar" }`,
expected: []item{
{itemLeftBrace, 0, `{`},
{itemIdentifier, 1, `NaN`},
{itemNEQ, 5, `!=`},
{itemString, 8, `"bar"`},
{itemRightBrace, 14, `}`},
},
}, {
input: `{alert=~"bar" }`,
expected: []item{
{itemLeftBrace, 0, `{`},
{itemIdentifier, 1, `alert`},
{itemEQLRegex, 6, `=~`},
{itemString, 8, `"bar"`},
{itemRightBrace, 14, `}`},
},
}, {
input: `{on!~"bar"}`,
expected: []item{
{itemLeftBrace, 0, `{`},
{itemIdentifier, 1, `on`},
{itemNEQRegex, 3, `!~`},
{itemString, 5, `"bar"`},
{itemRightBrace, 10, `}`},
},
}, {
input: `{alert!#"bar"}`, fail: true,
}, {
input: `{foo:a="bar"}`, fail: true,
},
// Test common errors.
{
input: `=~`, fail: true,
}, {
input: `!~`, fail: true,
}, {
input: `!(`, fail: true,
}, {
input: "1a", fail: true,
},
// Test mismatched parens.
{
input: `(`, fail: true,
}, {
input: `())`, fail: true,
}, {
input: `(()`, fail: true,
}, {
input: `{`, fail: true,
}, {
input: `}`, fail: true,
}, {
input: "{{", fail: true,
}, {
input: "{{}}", fail: true,
}, {
input: `[`, fail: true,
}, {
input: `[[`, fail: true,
}, {
input: `[]]`, fail: true,
}, {
input: `[[]]`, fail: true,
}, {
input: `]`, fail: true,
},
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// Test series description.
{
input: `{} _ 1 x .3`,
expected: []item{
{itemLeftBrace, 0, `{`},
{itemRightBrace, 1, `}`},
{itemBlank, 3, `_`},
{itemNumber, 5, `1`},
{itemTimes, 7, `x`},
{itemNumber, 9, `.3`},
},
seriesDesc: true,
},
{
input: `metric +Inf Inf NaN`,
expected: []item{
{itemIdentifier, 0, `metric`},
{itemADD, 7, `+`},
{itemNumber, 8, `Inf`},
{itemNumber, 12, `Inf`},
{itemNumber, 16, `NaN`},
},
seriesDesc: true,
},
{
input: `metric 1+1x4`,
expected: []item{
{itemIdentifier, 0, `metric`},
{itemNumber, 7, `1`},
{itemADD, 8, `+`},
{itemNumber, 9, `1`},
{itemTimes, 10, `x`},
{itemNumber, 11, `4`},
},
seriesDesc: 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 i, test := range tests {
l := lex(test.input)
l.seriesDesc = test.seriesDesc
out := []item{}
for it := range l.items {
out = append(out, it)
}
lastItem := out[len(out)-1]
if test.fail {
if lastItem.typ != itemError {
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t.Logf("%d: input %q", i, test.input)
t.Fatalf("expected lexing error but did not fail")
}
continue
}
if lastItem.typ == itemError {
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t.Logf("%d: input %q", i, test.input)
t.Fatalf("unexpected lexing error at position %d: %s", lastItem.pos, lastItem)
}
if !reflect.DeepEqual(lastItem, item{itemEOF, Pos(len(test.input)), ""}) {
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t.Logf("%d: input %q", i, test.input)
t.Fatalf("lexing error: expected output to end with EOF item.\ngot:\n%s", expectedList(out))
}
out = out[:len(out)-1]
if !reflect.DeepEqual(out, test.expected) {
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t.Logf("%d: input %q", i, test.input)
t.Fatalf("lexing mismatch:\nexpected:\n%s\ngot:\n%s", expectedList(test.expected), expectedList(out))
}
}
}
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func expectedList(exp []item) string {
s := ""
for _, it := range exp {
s += fmt.Sprintf("\t%#v\n", it)
}
return s
}