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650 lines
21 KiB
Markdown
650 lines
21 KiB
Markdown
[](https://travis-ci.org/valyala/quicktemplate)
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[](http://godoc.org/github.com/valyala/quicktemplate)
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[](https://goreportcard.com/report/github.com/valyala/quicktemplate)
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# quicktemplate
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A fast, powerful, yet easy to use template engine for Go.
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Inspired by the [Mako templates](http://www.makotemplates.org/) philosophy.
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# Features
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* [Extremely fast](#performance-comparison-with-htmltemplate).
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Templates are converted into Go code and then compiled.
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* Quicktemplate syntax is very close to Go - there is no need to learn
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yet another template language before starting to use quicktemplate.
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* Almost all bugs are caught during template compilation, so production
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suffers less from template-related bugs.
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* Easy to use. See [quickstart](#quick-start) and [examples](https://github.com/valyala/quicktemplate/tree/master/examples)
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for details.
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* Powerful. Arbitrary Go code may be embedded into and mixed with templates.
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Be careful with this power - do not query the database and/or external resources from
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templates unless you miss the PHP way in Go :) This power is mostly for
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arbitrary data transformations.
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* Easy to use template inheritance powered by [Go interfaces](https://golang.org/doc/effective_go.html#interfaces).
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See [this example](https://github.com/valyala/quicktemplate/tree/master/examples/basicserver) for details.
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* Templates are compiled into a single binary, so there is no need to copy
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template files to the server.
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# Drawbacks
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* Templates cannot be updated on the fly on the server, since they
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are compiled into a single binary.
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Take a look at [fasttemplate](https://github.com/valyala/fasttemplate)
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if you need a fast template engine for simple dynamically updated templates.
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[There are ways](https://www.reddit.com/r/golang/comments/f290ja/hot_reloading_with_quicktemplates_sqlc_and/) to dynamically update the templates during development.
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# Performance comparison with html/template
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Quicktemplate is more than 20x faster than [html/template](https://golang.org/pkg/html/template/).
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The following simple template is used in the benchmark:
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* [html/template version](https://github.com/valyala/quicktemplate/blob/master/testdata/templates/bench.tpl)
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* [quicktemplate version](https://github.com/valyala/quicktemplate/blob/master/testdata/templates/bench.qtpl)
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Benchmark results:
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```
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$ go test -bench='Benchmark(Quick|HTML)Template' -benchmem github.com/valyala/quicktemplate/tests
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BenchmarkQuickTemplate1-4 10000000 120 ns/op 0 B/op 0 allocs/op
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BenchmarkQuickTemplate10-4 3000000 441 ns/op 0 B/op 0 allocs/op
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BenchmarkQuickTemplate100-4 300000 3945 ns/op 0 B/op 0 allocs/op
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BenchmarkHTMLTemplate1-4 500000 2501 ns/op 752 B/op 23 allocs/op
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BenchmarkHTMLTemplate10-4 100000 12442 ns/op 3521 B/op 117 allocs/op
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BenchmarkHTMLTemplate100-4 10000 123392 ns/op 34498 B/op 1152 allocs/op
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```
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[goTemplateBenchmark](https://github.com/SlinSo/goTemplateBenchmark) compares QuickTemplate with numerous Go templating packages. QuickTemplate performs favorably.
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# Security
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* All template placeholders are HTML-escaped by default.
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* Template placeholders for JSON strings prevent from `</script>`-based
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XSS attacks:
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```qtpl
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{% func FailedXSS() %}
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<script>
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var s = {%q= "</script><script>alert('you pwned!')" %};
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</script>
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{% endfunc %}
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```
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# Examples
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See [examples](https://github.com/valyala/quicktemplate/tree/master/examples).
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# Quick start
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First of all, install the `quicktemplate` package
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and [quicktemplate compiler](https://github.com/valyala/quicktemplate/tree/master/qtc) (`qtc`):
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```
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go get -u github.com/valyala/quicktemplate
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go get -u github.com/valyala/quicktemplate/qtc
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```
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If you using `go generate`, you just need put following into your `main.go`
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Important: please specify your own folder (-dir) to generate template file
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```
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//go:generate go get -u github.com/valyala/quicktemplate/qtc
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//go:generate qtc -dir=app/views
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```
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Let's start with a minimal template example:
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```qtpl
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All text outside function templates is treated as comments,
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i.e. it is just ignored by quicktemplate compiler (`qtc`). It is for humans.
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Hello is a simple template function.
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{% func Hello(name string) %}
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Hello, {%s name %}!
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{% endfunc %}
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```
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Save this file into a `templates` folder under the name `hello.qtpl`
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and run `qtc` inside this folder.
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If everything went OK, `hello.qtpl.go` file should appear in the `templates` folder.
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This file contains Go code for `hello.qtpl`. Let's use it!
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Create a file main.go outside `templates` folder and put the following
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code there:
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```go
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package main
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import (
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"fmt"
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"./templates"
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)
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func main() {
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fmt.Printf("%s\n", templates.Hello("Foo"))
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fmt.Printf("%s\n", templates.Hello("Bar"))
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}
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```
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Then issue `go run`. If everything went OK, you'll see something like this:
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```
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Hello, Foo!
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Hello, Bar!
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```
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Let's create more a complex template which calls other template functions,
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contains loops, conditions, breaks, continues and returns.
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Put the following template into `templates/greetings.qtpl`:
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```qtpl
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Greetings greets up to 42 names.
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It also greets John differently comparing to others.
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{% func Greetings(names []string) %}
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{% if len(names) == 0 %}
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Nobody to greet :(
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{% return %}
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{% endif %}
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{% for i, name := range names %}
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{% if i == 42 %}
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I'm tired to greet so many people...
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{% break %}
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{% elseif name == "John" %}
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{%= sayHi("Mr. " + name) %}
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{% continue %}
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{% else %}
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{%= Hello(name) %}
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{% endif %}
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{% endfor %}
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{% endfunc %}
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sayHi is unexported, since it starts with lowercase letter.
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{% func sayHi(name string) %}
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Hi, {%s name %}
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{% endfunc %}
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Note that every template file may contain an arbitrary number
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of template functions. For instance, this file contains Greetings and sayHi
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functions.
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```
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Run `qtc` inside `templates` folder. Now the folder should contain
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two files with Go code: `hello.qtpl.go` and `greetings.qtpl.go`. These files
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form a single `templates` Go package. Template functions and other template
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stuff is shared between template files located in the same folder.
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So `Hello` template function may be used inside `greetings.qtpl` while
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it is defined in `hello.qtpl`.
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Moreover, the folder may contain ordinary Go files, so its contents may
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be used inside templates and vice versa.
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The package name inside template files may be overriden
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with `{% package packageName %}`.
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Now put the following code into `main.go`:
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```go
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package main
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import (
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"bytes"
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"fmt"
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"./templates"
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)
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func main() {
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names := []string{"Kate", "Go", "John", "Brad"}
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// qtc creates Write* function for each template function.
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// Such functions accept io.Writer as first parameter:
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var buf bytes.Buffer
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templates.WriteGreetings(&buf, names)
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fmt.Printf("buf=\n%s", buf.Bytes())
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}
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```
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Careful readers may notice different output tags were used in these
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templates: `{%s name %}` and `{%= Hello(name) %}`. What's the difference?
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The `{%s x %}` is used for printing HTML-safe strings, while `{%= F() %}`
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is used for embedding template function calls. Quicktemplate supports also
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other output tags:
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* `{%d int %}` and `{%dl int64 %}` for integers.
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* `{%f float %}` for float64.
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Floating point precision may be set via `{%f.precision float %}`.
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For example, `{%f.2 1.2345 %}` outputs `1.23`.
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* `{%z bytes %}` for byte slices.
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* `{%q str %}` and `{%qz bytes %}` for JSON-compatible quoted strings.
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* `{%j str %}` and `{%jz bytes %}` for embedding str into a JSON string. Unlike `{%q str %}`,
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it doesn't quote the string.
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* `{%u str %}` and `{%uz bytes %}` for [URL encoding](https://en.wikipedia.org/wiki/Percent-encoding)
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the given str.
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* `{%v anything %}` is equivalent to `%v` in [printf-like functions](https://golang.org/pkg/fmt/).
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All the output tags except `{%= F() %}` produce HTML-safe output, i.e. they
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escape `<` to `<`, `>` to `>`, etc. If you don't want HTML-safe output,
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then just put `=` after the tag. For example: `{%s= "<h1>This h1 won't be escaped</h1>" %}`.
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As you may notice `{%= F() %}` and `{%s= F() %}` produce the same output for `{% func F() %}`.
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But the first one is optimized for speed - it avoids memory allocations and copies.
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It is therefore recommended to stick to it when embedding template function calls.
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Additionally, the following extensions are supported for `{%= F() %}`:
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* `{%=h F() %}` produces html-escaped output.
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* `{%=u F() %}` produces [URL-encoded](https://en.wikipedia.org/wiki/Percent-encoding) output.
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* `{%=q F() %}` produces quoted json string.
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* `{%=j F() %}` produces json string without quotes.
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* `{%=uh F() %}` produces html-safe URL-encoded output.
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* `{%=qh F() %}` produces html-safe quoted json string.
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* `{%=jh F() %}` produces html-safe json string without quotes.
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All output tags except `{%= F() %}` family may contain arbitrary valid
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Go expressions instead of just an identifier. For example:
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```qtpl
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Import fmt for fmt.Sprintf()
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{% import "fmt" %}
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FmtFunc uses fmt.Sprintf() inside output tag
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{% func FmtFunc(s string) %}
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{%s fmt.Sprintf("FmtFunc accepted %q string", s) %}
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{% endfunc %}
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```
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There are other useful tags supported by quicktemplate:
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* `{% comment %}`
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```qtpl
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{% comment %}
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This is a comment. It won't trap into the output.
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It may contain {% arbitrary tags %}. They are just ignored.
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{% endcomment %}
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```
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* `{% plain %}`
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```qtpl
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{% plain %}
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Tags will {% trap into %} the output {% unmodified %}.
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Plain block may contain invalid and {% incomplete tags.
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{% endplain %}
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```
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* `{% collapsespace %}`
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```qtpl
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{% collapsespace %}
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<div>
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<div>space between lines</div>
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and {%s "tags" %}
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<div>is collapsed into a single space
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unless{% newline %}or{% space %}is used</div>
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</div>
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{% endcollapsespace %}
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```
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Is converted into:
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```
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<div> <div>space between lines</div> and tags <div>is collapsed into a single space unless
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or is used</div> </div>
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```
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* `{% stripspace %}`
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```qtpl
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{% stripspace %}
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<div>
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<div>space between lines</div>
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and {%s " tags" %}
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<div>is removed unless{% newline %}or{% space %}is used</div>
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</div>
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{% endstripspace %}
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```
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Is converted into:
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```
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<div><div>space between lines</div>and tags<div>is removed unless
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or is used</div></div>
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```
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* It is possible removing whitespace before and after the tag by adding `-` after `{%` or prepending `%}` with `-`. For example:
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```qtpl
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var sum int
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{%- for i := 1; i <= 3; i++ -%}
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sum += {%d i %}
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{%- endfor -%}
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return sum
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```
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Is converted into:
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```
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var sum int
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sum += 1
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sum += 2
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sum += 3
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return sum
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```
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* `{% switch %}`, `{% case %}` and `{% default %}`:
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```qtpl
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1 + 1 =
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{% switch 1+1 %}
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{% case 2 %}
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2?
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{% case 42 %}
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42!
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{% default %}
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I don't know :(
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{% endswitch %}
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```
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* `{% code %}`:
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```qtpl
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{% code
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// arbitrary Go code may be embedded here!
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type FooArg struct {
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Name string
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Age int
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}
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%}
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```
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* `{% package %}`:
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```qtpl
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Override default package name with the custom name
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{% package customPackageName %}
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```
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* `{% import %}`:
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```qtpl
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Import external packages.
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{% import "foo/bar" %}
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{% import (
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"foo"
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bar "baz/baa"
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) %}
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```
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* `{% cat "/path/to/file" %}`:
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```qtpl
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Cat emits the given file contents as a plaintext:
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{% func passwords() %}
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/etc/passwd contents:
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{% cat "/etc/passwd" %}
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{% endfunc %}
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```
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* `{% interface %}`:
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```qtpl
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Interfaces allow powerful templates' inheritance
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{%
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interface Page {
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Title()
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Body(s string, n int)
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Footer()
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}
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%}
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PrintPage prints Page
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{% func PrintPage(p Page) %}
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<html>
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<head><title>{%= p.Title() %}</title></head>
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<body>
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<div>{%= p.Body("foo", 42) %}</div>
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<div>{%= p.Footer() %}</div>
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</body>
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</html>
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{% endfunc %}
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Base page implementation
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{% code
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type BasePage struct {
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TitleStr string
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FooterStr string
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}
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%}
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{% func (bp *BasePage) Title() %}{%s bp.TitleStr %}{% endfunc %}
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{% func (bp *BasePage) Body(s string, n int) %}
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<b>s={%q s %}, n={%d n %}</b>
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{% endfunc %}
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{% func (bp *BasePage) Footer() %}{%s bp.FooterStr %}{% endfunc %}
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Main page implementation
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{% code
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type MainPage struct {
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// inherit from BasePage
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BasePage
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// real body for main page
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BodyStr string
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}
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%}
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Override only Body
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Title and Footer are used from BasePage.
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{% func (mp *MainPage) Body(s string, n int) %}
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<div>
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main body: {%s mp.BodyStr %}
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</div>
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<div>
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base body: {%= mp.BasePage.Body(s, n) %}
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</div>
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{% endfunc %}
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```
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See [basicserver example](https://github.com/valyala/quicktemplate/tree/master/examples/basicserver)
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for more details.
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# Performance optimization tips
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* Prefer calling `WriteFoo` instead of `Foo` when generating template output
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for `{% func Foo() %}`. This avoids unnesessary memory allocation and a copy
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for a `string` returned from `Foo()`.
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* Prefer `{%= Foo() %}` instead of `{%s= Foo() %}` when embedding
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a function template `{% func Foo() %}`. Though both approaches generate
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identical output, the first approach is optimized for speed.
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* Prefer using existing output tags instead of passing `fmt.Sprintf`
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to `{%s %}`. For instance, use `{%d num %}` instead
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of `{%s fmt.Sprintf("%d", num) %}`, because the first approach is optimized
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for speed.
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* Prefer using specific output tags instead of generic output tag
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`{%v %}`. For example, use `{%s str %}` instead of `{%v str %}`, since
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specific output tags are optimized for speed.
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* Prefer creating custom function templates instead of composing complex
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strings by hands before passing them to `{%s %}`.
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For instance, the first approach is slower than the second one:
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```qtpl
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{% func Foo(n int) %}
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{% code
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// construct complex string
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complexStr := ""
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for i := 0; i < n; i++ {
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complexStr += fmt.Sprintf("num %d,", i)
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}
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%}
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complex string = {%s= complexStr %}
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{% endfunc %}
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```
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```qtpl
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{% func Foo(n int) %}
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complex string = {%= complexStr(n) %}
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{% endfunc %}
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// Wrap complexStr func into stripspace for stripping unnesessary space
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// between tags and lines.
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{% stripspace %}
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{% func complexStr(n int) %}
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{% for i := 0; i < n; i++ %}
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num{% space %}{%d i %}{% newline %}
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{% endfor %}
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{% endfunc %}
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{% endstripspace %}
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```
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* Make sure that the `io.Writer` passed to `Write*` functions
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is [buffered](https://golang.org/pkg/bufio/#Writer).
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This will minimize the number of `write`
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[syscalls](https://en.wikipedia.org/wiki/System_call),
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which may be quite expensive.
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Note: There is no need to wrap [fasthttp.RequestCtx](https://godoc.org/github.com/valyala/fasthttp#RequestCtx)
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into [bufio.Writer](https://golang.org/pkg/bufio/#Writer), since it is already buffered.
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* [Profile](http://blog.golang.org/profiling-go-programs) your programs
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for memory allocations and fix the most demanding functions based on
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the output of `go tool pprof --alloc_objects`.
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# Use cases
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While the main quicktemplate purpose is generating HTML, it may be used
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for generating other data too. For example, JSON and XML marshalling may
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be easily implemented with quicktemplate:
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```qtpl
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{% code
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type MarshalRow struct {
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Msg string
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N int
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}
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type MarshalData struct {
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Foo int
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Bar string
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Rows []MarshalRow
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}
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%}
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// JSON marshaling
|
|
{% stripspace %}
|
|
{% func (d *MarshalData) JSON() %}
|
|
{
|
|
"Foo": {%d d.Foo %},
|
|
"Bar": {%q= d.Bar %},
|
|
"Rows":[
|
|
{% for i, r := range d.Rows %}
|
|
{
|
|
"Msg": {%q= r.Msg %},
|
|
"N": {%d r.N %}
|
|
}
|
|
{% if i + 1 < len(d.Rows) %},{% endif %}
|
|
{% endfor %}
|
|
]
|
|
}
|
|
{% endfunc %}
|
|
{% endstripspace %}
|
|
|
|
// XML marshalling
|
|
{% stripspace %}
|
|
{% func (d *MarshalData) XML() %}
|
|
<MarshalData>
|
|
<Foo>{%d d.Foo %}</Foo>
|
|
<Bar>{%s d.Bar %}</Bar>
|
|
<Rows>
|
|
{% for _, r := range d.Rows %}
|
|
<Row>
|
|
<Msg>{%s r.Msg %}</Msg>
|
|
<N>{%d r.N %}</N>
|
|
</Row>
|
|
{% endfor %}
|
|
</Rows>
|
|
</MarshalData>
|
|
{% endfunc %}
|
|
{% endstripspace %}
|
|
```
|
|
|
|
Usually, marshalling built with quicktemplate works faster than the marshalling
|
|
implemented via standard [encoding/json](https://golang.org/pkg/encoding/json/)
|
|
and [encoding/xml](https://golang.org/pkg/encoding/xml/).
|
|
See the corresponding benchmark results:
|
|
|
|
```
|
|
go test -bench=Marshal -benchmem github.com/valyala/quicktemplate/tests
|
|
BenchmarkMarshalJSONStd1-4 3000000 480 ns/op 8 B/op 1 allocs/op
|
|
BenchmarkMarshalJSONStd10-4 1000000 1842 ns/op 8 B/op 1 allocs/op
|
|
BenchmarkMarshalJSONStd100-4 100000 15820 ns/op 8 B/op 1 allocs/op
|
|
BenchmarkMarshalJSONStd1000-4 10000 159327 ns/op 59 B/op 1 allocs/op
|
|
BenchmarkMarshalJSONQuickTemplate1-4 10000000 162 ns/op 0 B/op 0 allocs/op
|
|
BenchmarkMarshalJSONQuickTemplate10-4 2000000 748 ns/op 0 B/op 0 allocs/op
|
|
BenchmarkMarshalJSONQuickTemplate100-4 200000 6572 ns/op 0 B/op 0 allocs/op
|
|
BenchmarkMarshalJSONQuickTemplate1000-4 20000 66784 ns/op 29 B/op 0 allocs/op
|
|
BenchmarkMarshalXMLStd1-4 1000000 1652 ns/op 2 B/op 2 allocs/op
|
|
BenchmarkMarshalXMLStd10-4 200000 7533 ns/op 11 B/op 11 allocs/op
|
|
BenchmarkMarshalXMLStd100-4 20000 65763 ns/op 195 B/op 101 allocs/op
|
|
BenchmarkMarshalXMLStd1000-4 2000 663373 ns/op 3522 B/op 1002 allocs/op
|
|
BenchmarkMarshalXMLQuickTemplate1-4 10000000 145 ns/op 0 B/op 0 allocs/op
|
|
BenchmarkMarshalXMLQuickTemplate10-4 3000000 597 ns/op 0 B/op 0 allocs/op
|
|
BenchmarkMarshalXMLQuickTemplate100-4 300000 5833 ns/op 0 B/op 0 allocs/op
|
|
BenchmarkMarshalXMLQuickTemplate1000-4 30000 53000 ns/op 32 B/op 0 allocs/op
|
|
```
|
|
|
|
# FAQ
|
|
|
|
* *Why is the quicktemplate syntax incompatible with [html/template](https://golang.org/pkg/html/template/)?*
|
|
|
|
Because `html/template` syntax isn't expressive enough for `quicktemplate`.
|
|
|
|
* *What's the difference between quicktemplate and [ego](https://github.com/benbjohnson/ego)?*
|
|
|
|
`Ego` is similar to `quicktemplate` in the sense it converts templates into Go code.
|
|
But it misses the following stuff, which makes `quicktemplate` so powerful
|
|
and easy to use:
|
|
|
|
* Defining multiple function templates in a single template file.
|
|
* Embedding function templates inside other function templates.
|
|
* Template interfaces, inheritance and overriding.
|
|
See [this example](https://github.com/valyala/quicktemplate/tree/master/examples/basicserver)
|
|
for details.
|
|
* Top-level comments outside function templates.
|
|
* Template packages.
|
|
* Combining arbitrary Go files with template files in template packages.
|
|
* Performance optimizations.
|
|
|
|
* *What's the difference between quicktemplate and [gorazor](https://github.com/sipin/gorazor)?*
|
|
|
|
`Gorazor` is similar to `quicktemplate` in the sense it converts templates into Go code.
|
|
But it misses the following useful features:
|
|
|
|
* Clear syntax instead of hard-to-understand magic stuff related
|
|
to template arguments, template inheritance and embedding function
|
|
templates into other templates.
|
|
|
|
* *Is there a syntax highlighting for qtpl files?*
|
|
|
|
Yes - see [this issue](https://github.com/valyala/quicktemplate/issues/19) for details.
|
|
If you are using JetBrains products (syntax highlighting and autocomplete):
|
|
* cd [JetBrains settings directory](https://intellij-support.jetbrains.com/hc/en-us/articles/206544519-Directories-used-by-the-IDE-to-store-settings-caches-plugins-and-logs)
|
|
* mkdir -p filetypes && cd filetypes
|
|
* curl https://raw.githubusercontent.com/valyala/quicktemplate/master/QuickTemplate.xml >> QuickTemplate.xml
|
|
* Restart your IDE
|
|
|
|
* *I didn't find an answer for my question here.*
|
|
|
|
Try exploring [these questions](https://github.com/valyala/quicktemplate/issues?q=label%3Aquestion).
|