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https://github.com/sipin/gorazor
Razor view engine for go
https://github.com/sipin/gorazor
fast go template-engine
Last synced: about 2 months ago
JSON representation
Razor view engine for go
- Host: GitHub
- URL: https://github.com/sipin/gorazor
- Owner: sipin
- License: other
- Created: 2014-05-01T05:30:31.000Z (over 10 years ago)
- Default Branch: main
- Last Pushed: 2024-07-22T14:36:14.000Z (5 months ago)
- Last Synced: 2024-10-25T05:24:54.128Z (about 2 months ago)
- Topics: fast, go, template-engine
- Language: Go
- Homepage:
- Size: 507 KB
- Stars: 859
- Watchers: 57
- Forks: 91
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# gorazor
[](https://travis-ci.org/sipin/gorazor)
[](https://goreportcard.com/report/github.com/sipin/gorazor)
[](https://996.icu)
[](https://github.com/996icu/996.ICU/blob/master/LICENSE)
`gorazor` is the Go port of the razor view engine originated from [asp.net in 2011](http://weblogs.asp.net/scottgu/archive/2010/07/02/introducing-razor.aspx). In summary, `gorazor` is:
* Extremely Fast. Templates are converted into Go code and then compiled with optimizations.
* Concise syntax, no delimiter like ``, `<%`, or `{{`.
* Original [Razor Syntax](http://www.asp.net/web-pages/tutorials/basics/2-introduction-to-asp-net-web-programming-using-the-razor-syntax) & [quick reference](http://haacked.com/archive/2011/01/06/razor-syntax-quick-reference.aspx/) for asp.net.
* Able to mix go code in view template
* Insert code block to import & call arbitrary go modules & functions
* Flow controls are just Go, no need to learn another mini-language
* Code generation approach
* No reflection overhead
* Go compiler validation for free
* Strong type view model
* Embedding templates support
* Layout/Section support
# Extremely Fast
`gorazor` is about **20X** times faster than [html/template](https://golang.org/pkg/html/template/) when using standard `strings.Builder` for template writing.
When using `quicktemplate`'s `ByteBuffer` and `unsafeStrToBytes` method to for template writing, `gorazor`'s performance is comparable to [quicktemplate](https://github.com/valyala/quicktemplate), if not faster.
Benchmark results:
```bash
$ go test -bench='Benchmark(Razor|RazorQuick|Quick|HTML)Template' -benchmem github.com/valyala/quicktemplate/tests github.com/sipin/gorazor/tests
goos: windows
goarch: amd64
pkg: github.com/valyala/quicktemplate/tests
BenchmarkQuickTemplate1-8 50000000 35.6 ns/op 0 B/op 0 allocs/op
BenchmarkQuickTemplate10-8 10000000 152 ns/op 0 B/op 0 allocs/op
BenchmarkQuickTemplate100-8 1000000 1460 ns/op 0 B/op 0 allocs/op
BenchmarkHTMLTemplate1-8 2000000 712 ns/op 608 B/op 21 allocs/op
BenchmarkHTMLTemplate10-8 500000 3586 ns/op 2834 B/op 111 allocs/op
BenchmarkHTMLTemplate100-8 50000 35180 ns/op 28055 B/op 1146 allocs/op
PASS
ok github.com/valyala/quicktemplate/tests 11.360s
goos: windows
goarch: amd64
pkg: github.com/sipin/gorazor/tests
BenchmarkRazorTemplate1-8 30000000 49.8 ns/op 224 B/op 3 allocs/op
BenchmarkRazorTemplate10-8 10000000 122 ns/op 480 B/op 4 allocs/op
BenchmarkRazorTemplate100-8 2000000 931 ns/op 4064 B/op 7 allocs/op
BenchmarkRazorQuickTemplate1-8 100000000 19.9 ns/op 0 B/op 0 allocs/op
BenchmarkRazorQuickTemplate10-8 20000000 82.5 ns/op 0 B/op 0 allocs/op
BenchmarkRazorQuickTemplate100-8 2000000 767 ns/op 0 B/op 0 allocs/op
BenchmarkRazorQuickTemplateOriginal1-8 100000000 17.4 ns/op 0 B/op 0 allocs/op
BenchmarkRazorQuickTemplateOriginal10-8 20000000 68.8 ns/op 0 B/op 0 allocs/op
BenchmarkRazorQuickTemplateOriginal100-8 2000000 656 ns/op 0 B/op 0 allocs/op
PASS
ok github.com/sipin/gorazor/tests 19.921s
```
* `BenchmarkRazorQuickTemplate`'s manually modified ensure **exact output** as quicktemplate for comparism.
* `BenchmarkRazorQuickTemplateOriginal` are `gorazor`'s default code-gen, which produce less white-space, thus faster.
# Usage
`gorazor` supports `go 1.10` and above, for go version **below 1.10**, you may use [gorazor classic version](https://github.com/sipin/gorazor/releases/tag/v1.0).
`go 1.12` are recommended for better **compiler optimization**.
## Install
```sh
go get github.com/sipin/gorazor
```
## Usage
* Process folder: `gorazor template_folder output_folder`
* Process file: `gorazor template_file output_file`
## Examples
[Examples] gives examples using layout / helper etc.
When using layout, you may need to set `-prefix` parameter, like:
```bash
git clone https://github.com/sipin/gorazor/
cd gorazor
go build
# -prefix parameter here tells gorazor the current folder is the base path for github.com/sipin/gorazor
# So that, when importing "github.com/sipin/gorazor/examples/tpl/layout" in example/tpl/home.gohtml
# gorazor will know how to find the layout/helper files
./gorazor -prefix github.com/sipin/gorazor ./examples/tpl ./examples/tpl
go run example/main.go
```
# Syntax
## Variable
* `@variable` to insert **string** variable into html template
* variable could be wrapped by arbitrary go functions
* variable inserted will be automatically [escaped](http://golang.org/pkg/html/template/#HTMLEscapeString)
```html
Hello @user.Name
```
```html
Hello @strings.ToUpper(req.CurrentUser.Name)
```
Use `raw` to skip escaping:
```html
@raw(user.Name)
```
Only use `raw` when you are 100% sure what you are doing, please always be aware of [XSS attack](http://en.wikipedia.org/wiki/Cross-site_scripting).
## Flow Control
```php
@if .... {
....
}
@if .... {
....
} else {
....
}
@for .... {
}
@{
switch .... {
case ....:
...
case 2:
...
default:
...
}
}
```
Please use [example](https://github.com/sipin/gorazor/blob/master/examples/tpl/home.gohtml) for reference.
## Code block
Arbitrary go code could be used in templates, like creating a new variable.
```html
@{
username := u.Name
if u.Email != "" {
username += "(" + u.Email + ")"
}
}
Hello @username
```
It's recommended to keep clean separation of code & view. **Please consider** move logic into your code before creating a code block in a template.
## Declaration
The **first code block** in template is strictly for declaration:
* imports
* model type
* layout
like:
```go
@{
import (
"kp/models" //import `"kp/models"` package
"tpl/layout" //import tpl/layout namespace
)
layout := layout.Base //Use layout package's **Base func** for layout
var user *models.User //1st template param
var blog *models.Blog //2nd template param
}
...
```
**first code block** must be at the beginning of the template, i.e. before any html.
Any other codes inside the first code block will **be ignored**.
import must be wrapped in `()`, `import "package_name"` is not yet supported.
The variables declared in **first code block** will be the models of the template, i.e. the parameters of generated function.
If your template doesn't need any model input, then just leave it blank.
## Helper / Include other template
As `gorazor` compiles templates to go function, embedding another template is just calling the generated function, like any other go function.
However, if the templates are designed to be embedded, they must be under `helper` namespace, i.e. put them in `helper` sub-folder.
So, using a helper template is similar to:
```html
@if msg != "" {
@helper.ShowMsg(msg)
}
```
`gorazor` won't HTML escape the output of `helper.XXX`.
Please use [example](https://github.com/sipin/gorazor/blob/master/examples/tpl/home.gohtml) for reference.
## Layout & Section
The syntax for declaring layout is a bit tricky, in the example mentioned above:
```go
@{
import (
"tpl/layout"
)
layout := layout.Base //Use layout package's **base func** for layout
}
```
`"tpl/layout"` **is** the layout package namespace, and the `layout` variable refers to `"layout.Base"` func, which should be generated by `tpl/layout/base.gohtml`.
> Must use `layout` as the variable name
### Package / Variable convention
* The namespace/folder name for layout templates **must be** `layout`
* `gorazor` relies on this to determine if a template is for layout
* The template `variable name` also **must be** `layout`
A layout file `tpl/layout/base.gohtml` may look like:
```html
@{
var body string
var sidebar string
var footer string
var title string
var css string
var js string
}
@title
@body
@js
```
It's just a usual `gorazor` template, but:
* First param must be `var body string` (As it's always required, maybe we could remove it in future?)
* All params **must be** string, each param is considered as a **section**, the variable name is the **section name**.
* Under `layout` package, i.e. within "layout" folder.
* Optionally, use `isLayout := true` to declare a template as layout
A template using such layout `tpl/index.gohtml` may look like:
```html
@{
import (
"tpl/layout"
)
layout := layout.Base
}
@section footer {
Copyright 2014
}
Welcome to homepage
```
It's also possible to use import alias:
```html
@{
import (
share "tpl/layout"
)
layout := share.Base
}
```
With the page, the page content will be treated as the `body` section in the layout.
The other section content need to be wrapped with
```
@section SectionName {
....
}
```
The template doesn't need to specify all sections defined in the layout. If a section is not specified, it will be considered as `""`.
Thus, it's possible for the layout to define default section content in such manner:
```html
@{
var body string
var sidebar string
}
@body
@if sidebar == "" {
} else {
}
```
* A layout should be able to use another layout, it's just function call.
# Conventions
* Template **folder name** will be used as **package name** in generated code
* Template file name must has the extension name `.gohtml`
* Template strip of `.gohtml` extension name will be used as the **function name** in generated code, with **first letter Capitalized**.
* So that the function will be accessible to other modules. (I hate GO about this.)
* Helper templates **must** has the package name **helper**, i.e. in `helper` folder.
* Layout templates **must** has the package name **layout**, i.e. in `layout` folder.
# Example
Here is a simple example of [gorazor templates](https://github.com/sipin/gorazor/tree/master/examples/tpl) and the corresponding [generated codes](https://github.com/sipin/gorazor/tree/master/examples/gen).
# FAQ
## IDE / Editor support?
### Sublime Text 2/3
* **Syntax highlight** Search & install `gorazor` via Package Control.
* **Context aware auto-completion**, you may need to [manually modify](https://github.com/sipin/GoSublime/commit/fd0b979e7cc1d8f2438bb314399c2456d16f3ffb) GoSublime package, basically replace `gscomplete.py` in with [this](https://raw.githubusercontent.com/sipin/GoSublime/gorazor/gscomplete.py) and `gslint.py` with [this](https://raw.githubusercontent.com/sipin/GoSublime/gorazor/gslint.py)
### Emacs
[web-mode](http://web-mode.org/) supports Razor template engine, so add this into your Emacs config file:
```lisp
(require 'web-mode)
(add-hook 'web-mode-hook 'my-web-mode-hook)
(add-to-list 'auto-mode-alist '("\\.html?\\'" . web-mode))
(add-to-list 'auto-mode-alist '("\\.gohtml\\'" . web-mode))
(add-to-list 'auto-mode-alist '("\\.js\\'" . web-mode))
(setq web-mode-engines-alist '(("razor" . "\\.gohtml\\'")))
```
# Credits
The very [first version](https://github.com/sipin/gorazor/releases/tag/vash) of `gorazor` is a hack of razor's port in javascript: [vash](https://github.com/kirbysayshi/vash), thus requires node's to run.
`gorazor` has been though several rounds of refactoring, and it has completely rewritten in pure Go. Nonetheless, THANK YOU [@kirbysayshi](https://github.com/kirbysayshi) for Vash! Without Vash, `gorazor` may never start.
# LICENSE
[LICENSE](LICENSE)? Well, [WTFPL](http://www.wtfpl.net/about/) and [996.icu](LICENSE).
# Todo
[Todo](https://github.com/sipin/gorazor/blob/master/todo.md)