105 lines
3.1 KiB
Markdown
105 lines
3.1 KiB
Markdown
Rendering
|
|
==========
|
|
**_From version 1.2_**
|
|
|
|
To render an AST generated by Peast you need to create an instance of the **Renderer** class and associate a **Formatter** to it:
|
|
```php
|
|
$source = "var a;";
|
|
//Generate the AST
|
|
$ast = Peast\Peast::latest($source, $options)->parse();
|
|
//Create the renderer
|
|
$renderer = new Peast\Renderer;
|
|
//Associate the formatter
|
|
$renderer->setFormatter(new Peast\Formatter\PrettyPrint);
|
|
//Render the AST
|
|
echo $renderer->render($ast); //"var a;"
|
|
```
|
|
|
|
Formatters
|
|
-------------
|
|
A Formatter specifies how the Renderer must format the nodes to produce the output.
|
|
Peast implements 3 formatters: **PrettyPrint**, **Compact** and **Expanded**.
|
|
|
|
For example using this source code:
|
|
```js
|
|
if (fn(param)) alert("Ok");
|
|
else alert("Fail");
|
|
```
|
|
|
|
##### PrettyPrint
|
|
Produces a well formatted version of the code.
|
|
```js
|
|
if (fn(param)) {
|
|
alert("Ok");
|
|
} else {
|
|
alert("Fail");
|
|
}
|
|
```
|
|
|
|
##### Compact
|
|
Produces a compact version of the code by removing whitespaces and optional brackets.
|
|
```js
|
|
if (fn(param))alert("Ok");else alert("Fail");
|
|
```
|
|
|
|
##### Expanded
|
|
An expanded version of PrettyPrint.
|
|
```js
|
|
if ( fn( param ) )
|
|
{
|
|
alert( "Ok" );
|
|
} else
|
|
{
|
|
alert( "Fail" );
|
|
}
|
|
```
|
|
|
|
Custom Formatter
|
|
-------------
|
|
Peast allows you to create your own formatter.
|
|
You can do it by creating a class that extends `Peast\Formatter\Base` class and overwriting its protected properties:
|
|
|
|
```php
|
|
class MyFormatter extends Peast\Formatter\Base {
|
|
//Use Windows style line endings
|
|
protected $newLine = "\r\n";
|
|
}
|
|
$renderer = new Peast\Renderer;
|
|
$renderer->setFormatter(new MyFormatter);
|
|
echo $renderer->render($ast);
|
|
```
|
|
|
|
Available properties are:
|
|
* `$newLine`: line separator string (default: `"\n"`)
|
|
* `$indentation`: indentation string (default: `"\t"`)
|
|
* `$newLineBeforeCurlyBracket`: if true, open curly brackets of code blocks will be put on a new line (default: `false`)
|
|
* `$alwaysWrapBlocks`: if true, curly brackets around code blocks will always be inserted, also when they are optional (default: `true`)
|
|
* `$spacesAroundOperators`: if true, a space will be inserted before and after operators (default: `true`)
|
|
* `$spacesInsideRoundBrackets`: if true, content inside round brackets will be surrounded by spaces (default: `false`)
|
|
|
|
Shortcut method
|
|
-------------
|
|
Every syntax node has its own `render` method that you can use as a shortcut.
|
|
For example:
|
|
|
|
```php
|
|
$ast = Peast\Peast::latest($source, $options)->parse();
|
|
$ast->render(new Peast\Formatter\PrettyPrint);
|
|
//Equivalent to
|
|
$ast = Peast\Peast::latest($source, $options)->parse();
|
|
$renderer = new Peast\Renderer;
|
|
$renderer->setFormatter(new Peast\Formatter\PrettyPrint);
|
|
$renderer->render($ast);
|
|
```
|
|
|
|
Comments rendering
|
|
-------------
|
|
**_From version 1.14_**
|
|
Comments can be rendered by passing `true` to the formatter constructor:
|
|
```php
|
|
$ast = Peast\Peast::latest($source, array("comments" => true))->parse();
|
|
$ast->render(new Peast\Formatter\PrettyPrint(true));
|
|
```
|
|
Note that comments can be rendered only when parser is enabled to collect them, to do this you must set the `comments` option to `true`.
|
|
Also note that only PrettyPrint and Expanded formatters allow comments rendering, while Compact does not allow it by default.
|