ad2642a8aa
* Implementation for calculating language statistics Impement saving code language statistics to database Implement rendering langauge stats Add primary laguage to show in repository list Implement repository stats indexer queue Add indexer test Refactor to use queue module * Do not timeout for queues
3.1 KiB
3.1 KiB
substring 
Simple and composable alternative to regexp package for fast substring searches.
Installation
The recommended way to install substring
go get -t gopkg.in/toqueteos/substring.v1
The -t flag is for fetching gocheck, required for tests and benchmarks.
Examples
A basic example with two matchers:
package main
import (
"fmt"
"regexp"
"gopkg.in/toqueteos/substring.v1"
)
func main() {
m1 := substring.After("assets/", substring.Or(
substring.Has("jquery"),
substring.Has("angular"),
substring.Suffixes(".js", ".css", ".html"),
))
fmt.Println(m1.Match("assets/angular/foo/bar")) //Prints: true
fmt.Println(m1.Match("assets/js/file.js")) //Prints: true
fmt.Println(m1.Match("assets/style/bar.css")) //Prints: true
fmt.Println(m1.Match("assets/foo/bar.html")) //Prints: false
fmt.Println(m1.Match("assets/js/qux.json")) //Prints: false
fmt.Println(m1.Match("core/file.html")) //Prints: false
fmt.Println(m1.Match("foobar/that.jsx")) //Prints: false
m2 := substring.After("vendor/", substring.Suffixes(".css", ".js", ".less"))
fmt.Println(m2.Match("foo/vendor/bar/qux.css")) //Prints: true
fmt.Println(m2.Match("foo/var/qux.less")) //Prints: false
re := regexp.MustCompile(`vendor\/.*\.(css|js|less)$`)
fmt.Println(re.MatchString("foo/vendor/bar/qux.css")) //Prints: true
fmt.Println(re.MatchString("foo/var/qux.less")) //Prints: false
}
How fast?
It may vary depending on your use case but 1~2 orders of magnitude faster than regexp is pretty common.
Test it out for yourself by running go test -check.b!
$ go test -check.b
PASS: lib_test.go:18: LibSuite.BenchmarkExample1 10000000 221 ns/op
PASS: lib_test.go:23: LibSuite.BenchmarkExample2 10000000 229 ns/op
PASS: lib_test.go:28: LibSuite.BenchmarkExample3 10000000 216 ns/op
PASS: lib_test.go:33: LibSuite.BenchmarkExample4 10000000 208 ns/op
PASS: lib_test.go:38: LibSuite.BenchmarkExample5 20000000 82.1 ns/op
PASS: lib_test.go:48: LibSuite.BenchmarkExampleRe1 500000 4136 ns/op
PASS: lib_test.go:53: LibSuite.BenchmarkExampleRe2 500000 5222 ns/op
PASS: lib_test.go:58: LibSuite.BenchmarkExampleRe3 500000 5116 ns/op
PASS: lib_test.go:63: LibSuite.BenchmarkExampleRe4 500000 4020 ns/op
PASS: lib_test.go:68: LibSuite.BenchmarkExampleRe5 10000000 226 ns/op
OK: 10 passed
PASS
ok gopkg.in/toqueteos/substring.v1 23.471s
License
MIT, see LICENSE