那般一段内容替换来澳门金冠开户

以前大家兑现了最简便易行的echo命令的沙盘替换,便是将{{ $name }}这样一段内容替换到<?php echo $name ?>

当今大家的话下任何的吩咐,先来回看下此前的概念

  • 出口变量值

{{ }} 表明式的再次回到值将被电动传送给 PHPhtmlentities
函数实行管理,以堤防 XSS 攻击。

Hello, {{ $name }}!
  • 出口未转义的变量值

    Hello, {!! $name !!}!

  • If 表达式

通过 @if@elseif@else@endif 指令能够创制 if 表达式。

@if (count($records) === 1)
    I have one record!
@elseif (count($records) > 1)
    I have multiple records!
@else
    I don't have any records!
@endif
  • 循环

    @for ($i = 0; $i < 10; $i++)

    The current value is {{ $i }}
    

    @endfor

    @foreach ($users as $user)

    <p>This is user {{ $user->id }}</p>
    

    @endforeach

    @while (true)

    <p>I'm looping forever.</p>
    

    @endwhile

  • 引进别的视图

    @include(‘view.name’, [‘some’ => ‘data’])

要协作这么些概念,大家要写出相应的正则表明式,关于@始发的命令直接拿了laravel中的使用。

大家先在src下创建view文件夹,再创建Compiler类文件。

咱俩将compiler的艺术氛围二种,一种是@开头的通令(Statements),一种是出口(Echos)。那二种的正则是不一样的。

率先定义变量compliers,定义如下:

protected $compilers = [
    'Statements',
    'Echos',
];

然后按着见原本Controllerrender艺术的剧情迁移到Complier类中,按那三种依次相称,代码如下:

public function compile($path = null)
{
    $fileContent = file_get_contents($path);
    $result = '';
    foreach (token_get_all($fileContent) as $token) {
        if (is_array($token)) {
            list($id, $content) = $token;
            if ($id == T_INLINE_HTML) {
                foreach ($this->compilers as $type) {
                    $content = $this->{"compile{$type}"}($content);
                }
            }
            $result .= $content;
        } else {
            $result .= $token;
        }
    }
    $generatedFile = '../runtime/cache/' . md5($path);
    file_put_contents($generatedFile, $result);
    require_once $generatedFile;
}

protected function compileStatements($content)
{
    return $content;
}

protected function compileEchos($content)
{
    return preg_replace('/{{(.*)}}/', '<?php echo $1 ?>', $content);
}

其中的Statements统统未有管理,Echos则依然跟以前同样。

先来调度下Echos中的管理,增添变量记录{{ }}{!! !!}的名称

protected $echoCompilers = [
    'RawEchos',
    'EscapedEchos'
];

管理的时候能够增加一下存在的推断,暗许值是null,内容能够调动如下:

protected function compileEchos($content)
{
    foreach ($this->echoCompilers as $type) {
        $content = $this->{"compile{$type}"}($content);
    }
    return $content;
}

protected function compileEscapedEchos($content)
{
    return preg_replace('/{{(.*)}}/', '<?php echo htmlentities(isset($1) ? $1 : null) ?>', $content);
}

protected function compileRawEchos($content)
{
    return preg_replace('/{!!(.*)!!}/', '<?php echo isset($1) ? $1 : null ?>', $content);
}

EscapedEchosRawEchos的区分在于,第叁个会做html转义。

小编们再来看Statements一声令下的管理,其原理也一律,相称到相应的通令,如ifforeach,调用相应的主意做替换。

代码如下:

protected function compileStatements($content)
{
    return preg_replace_callback(
            '/\B@(@?\w+(?:::\w+)?)([ \t]*)(\( ( (?>[^()]+) | (?3) )* \))?/x', function ($match) {
            return $this->compileStatement($match);
        }, $content
    );
}

protected function compileStatement($match)
{
    if (strpos($match[1], '@') !== false) {
        $match[0] = isset($match[3]) ? $match[1].$match[3] : $match[1];
    } elseif (method_exists($this, $method = 'compile'.ucfirst($match[1]))) {
        $match[0] = $this->$method(isset($match[3]) ? $match[3] : null);
    }

    return isset($match[3]) ? $match[0] : $match[0].$match[2];
}

protected function compileIf($expression)
{
    return "<?php if{$expression}: ?>";
}

protected function compileElseif($expression)
{
    return "<?php elseif{$expression}: ?>";
}

protected function compileElse($expression)
{
    return "<?php else{$expression}: ?>";
}

protected function compileEndif($expression)
{
    return '<?php endif; ?>';
}

protected function compileFor($expression)
{
    return "<?php for{$expression}: ?>";
}

protected function compileEndfor($expression)
{
    return '<?php endfor; ?>';
}

protected function compileForeach($expression)
{
    return "<?php foreach{$expression}: ?>";
}

protected function compileEndforeach($expression)
{
    return '<?php endforeach; ?>';
}

protected function compileWhile($expression)
{
    return "<?php while{$expression}: ?>";
}

protected function compileEndwhile($expression)
{
    return '<?php endwhile; ?>';
}

protected function compileContinue($expression)
{
    return '<?php continue; ?>';
}

protected function compileBreak($expression)
{
    return '<?php break; ?>';
}

其中的include落到实处相比费劲,就一直不做,留给我们想想啦。

然后,大家再思量一下,不只怕每一遍都去操作文件再一次生成,作者应该要看清文件退换,若是没退换一向动用缓存就足以了。

调动代码如下:

public function isExpired($path)
{
    $compiled = $this->getCompiledPath($path);
    if (!file_exists($compiled)) {
        return true;
    }

    return filemtime($path) >= filemtime($compiled);
}

protected function getCompiledPath($path)
{
    return '../runtime/cache/' . md5($path);
}

public function compile($file = null, $params = [])
{
    $path = '../views/' . $file . '.sf';
    extract($params);
    if (!$this->isExpired($path)) {
        $compiled = $this->getCompiledPath($path);
        require_once $compiled;
        return;
    }
    $fileContent = file_get_contents($path);
    $result = '';
    foreach (token_get_all($fileContent) as $token) {
        if (is_array($token)) {
            list($id, $content) = $token;
            if ($id == T_INLINE_HTML) {
                foreach ($this->compilers as $type) {
                    $content = $this->{"compile{$type}"}($content);
                }
            }
            $result .= $content;
        } else {
            $result .= $token;
        }
    }
    $compiled = $this->getCompiledPath($path);
    file_put_contents($compiled, $result);
    require_once $compiled;
}

这些种类的博客到这里就一时半刻告一段落了~

品类内容和博客内容也都会放到Github上,迎接我们提建议。

code:https://github.com/CraryPrimitiveMan/simple-framework/tree/1.2

blog
project:https://github.com/CraryPrimitiveMan/create-your-own-php-framework

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