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90 lines
3.3 KiB
90 lines
3.3 KiB
// Copyright 2020 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 labels |
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import ( |
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"regexp/syntax" |
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"testing" |
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"github.com/prometheus/prometheus/util/testutil" |
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) |
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func TestNewFastRegexMatcher(t *testing.T) { |
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cases := []struct { |
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regex string |
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value string |
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expected bool |
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}{ |
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{regex: "(foo|bar)", value: "foo", expected: true}, |
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{regex: "(foo|bar)", value: "foo bar", expected: false}, |
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{regex: "(foo|bar)", value: "bar", expected: true}, |
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{regex: "foo.*", value: "foo bar", expected: true}, |
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{regex: "foo.*", value: "bar foo", expected: false}, |
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{regex: ".*foo", value: "foo bar", expected: false}, |
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{regex: ".*foo", value: "bar foo", expected: true}, |
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{regex: ".*foo", value: "foo", expected: true}, |
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{regex: "^.*foo$", value: "foo", expected: true}, |
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{regex: "^.+foo$", value: "foo", expected: false}, |
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{regex: "^.+foo$", value: "bfoo", expected: true}, |
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{regex: ".*", value: "\n", expected: false}, |
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{regex: ".*", value: "\nfoo", expected: false}, |
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{regex: ".*foo", value: "\nfoo", expected: false}, |
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{regex: "foo.*", value: "foo\n", expected: false}, |
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{regex: "foo\n.*", value: "foo\n", expected: true}, |
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{regex: ".*foo.*", value: "foo", expected: true}, |
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{regex: ".*foo.*", value: "foo bar", expected: true}, |
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{regex: ".*foo.*", value: "hello foo world", expected: true}, |
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{regex: ".*foo.*", value: "hello foo\n world", expected: false}, |
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{regex: ".*foo\n.*", value: "hello foo\n world", expected: true}, |
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{regex: ".*", value: "foo", expected: true}, |
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{regex: "", value: "foo", expected: false}, |
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{regex: "", value: "", expected: true}, |
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} |
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for _, c := range cases { |
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m, err := NewFastRegexMatcher(c.regex) |
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testutil.Ok(t, err) |
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testutil.Equals(t, c.expected, m.MatchString(c.value)) |
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} |
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} |
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func TestOptimizeConcatRegex(t *testing.T) { |
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cases := []struct { |
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regex string |
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prefix string |
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suffix string |
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contains string |
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}{ |
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{regex: "foo(hello|bar)", prefix: "foo", suffix: "", contains: ""}, |
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{regex: "foo(hello|bar)world", prefix: "foo", suffix: "world", contains: ""}, |
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{regex: "foo.*", prefix: "foo", suffix: "", contains: ""}, |
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{regex: "foo.*hello.*bar", prefix: "foo", suffix: "bar", contains: "hello"}, |
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{regex: ".*foo", prefix: "", suffix: "foo", contains: ""}, |
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{regex: "^.*foo$", prefix: "", suffix: "foo", contains: ""}, |
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{regex: ".*foo.*", prefix: "", suffix: "", contains: "foo"}, |
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{regex: ".*foo.*bar.*", prefix: "", suffix: "", contains: "foo"}, |
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{regex: ".*(foo|bar).*", prefix: "", suffix: "", contains: ""}, |
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{regex: ".*[abc].*", prefix: "", suffix: "", contains: ""}, |
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} |
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for _, c := range cases { |
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parsed, err := syntax.Parse(c.regex, syntax.Perl) |
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testutil.Ok(t, err) |
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prefix, suffix, contains := optimizeConcatRegex(parsed) |
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testutil.Equals(t, c.prefix, prefix) |
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testutil.Equals(t, c.suffix, suffix) |
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testutil.Equals(t, c.contains, contains) |
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} |
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}
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