86 lines
2.9 KiB
Markdown
86 lines
2.9 KiB
Markdown
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fasttemplate
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============
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Simple and fast template engine for Go.
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Fasttemplate performs only a single task - it substitutes template placeholders
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with user-defined values. At high speed :)
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Take a look at [quicktemplate](https://github.com/valyala/quicktemplate) if you need fast yet powerful html template engine.
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*Please note that fasttemplate doesn't do any escaping on template values
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unlike [html/template](http://golang.org/pkg/html/template/) do. So values
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must be properly escaped before passing them to fasttemplate.*
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Fasttemplate is faster than [text/template](http://golang.org/pkg/text/template/),
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[strings.Replace](http://golang.org/pkg/strings/#Replace),
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[strings.Replacer](http://golang.org/pkg/strings/#Replacer)
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and [fmt.Fprintf](https://golang.org/pkg/fmt/#Fprintf) on placeholders' substitution.
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Below are benchmark results comparing fasttemplate performance to text/template,
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strings.Replace, strings.Replacer and fmt.Fprintf:
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```
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$ go test -bench=. -benchmem
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PASS
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BenchmarkFmtFprintf-4 2000000 790 ns/op 0 B/op 0 allocs/op
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BenchmarkStringsReplace-4 500000 3474 ns/op 2112 B/op 14 allocs/op
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BenchmarkStringsReplacer-4 500000 2657 ns/op 2256 B/op 23 allocs/op
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BenchmarkTextTemplate-4 500000 3333 ns/op 336 B/op 19 allocs/op
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BenchmarkFastTemplateExecuteFunc-4 5000000 349 ns/op 0 B/op 0 allocs/op
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BenchmarkFastTemplateExecute-4 3000000 383 ns/op 0 B/op 0 allocs/op
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BenchmarkFastTemplateExecuteFuncString-4 3000000 549 ns/op 144 B/op 1 allocs/op
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BenchmarkFastTemplateExecuteString-4 3000000 572 ns/op 144 B/op 1 allocs/op
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BenchmarkFastTemplateExecuteTagFunc-4 2000000 743 ns/op 144 B/op 3 allocs/op
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```
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Docs
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====
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See http://godoc.org/github.com/valyala/fasttemplate .
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Usage
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=====
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```go
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template := "http://{{host}}/?q={{query}}&foo={{bar}}{{bar}}"
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t := fasttemplate.New(template, "{{", "}}")
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s := t.ExecuteString(map[string]interface{}{
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"host": "google.com",
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"query": url.QueryEscape("hello=world"),
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"bar": "foobar",
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})
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fmt.Printf("%s", s)
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// Output:
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// http://google.com/?q=hello%3Dworld&foo=foobarfoobar
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```
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Advanced usage
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==============
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```go
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template := "Hello, [user]! You won [prize]!!! [foobar]"
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t, err := fasttemplate.NewTemplate(template, "[", "]")
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if err != nil {
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log.Fatalf("unexpected error when parsing template: %s", err)
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}
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s := t.ExecuteFuncString(func(w io.Writer, tag string) (int, error) {
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switch tag {
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case "user":
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return w.Write([]byte("John"))
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case "prize":
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return w.Write([]byte("$100500"))
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default:
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return w.Write([]byte(fmt.Sprintf("[unknown tag %q]", tag)))
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}
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})
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fmt.Printf("%s", s)
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// Output:
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// Hello, John! You won $100500!!! [unknown tag "foobar"]
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```
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