搜索并替换PHP中给定模式内的字符串

如何解决搜索并替换PHP中给定模式内的字符串

我正在尝试从给定的字符串模式生成html，类似于插件。 有三种模式，一个 no arg，一个单 arg和一个 multi arg字符串模式。我无法更改此模式，因为它来自CMS。

{pluginName} or {pluginName=3} or {pluginName id=3|view=simple|arg999=asv}

一个例子：

<p>Hi this is a html page</p> 
<p>The following line should generate html</p>
{pluginName=3}
<p>The following line also should generate html</p>
{pluginName id=3|view=simple|arg999=asv}

我的目标是用某些东西替换那些“标签”（对于每个问题来说，处理这个问题并不重要）。但是我希望能够将给出的args传递给应该处理该逻辑的类/函数。

这是我的第一次尝试，不使用正则表达式，因为我不知道如何使用正则表达式（主要是因为它们速度较慢）。

<?php
function processPlugins($text,$pos = 0,$start = '{',$end = '}') {
    $plugins = array('plugin1','plugin2');
    while(($pos = strpos($text,$start,$pos)) !== false) {
        $startPos = $pos;
        $pos += strlen($start);
        foreach($plugins as $plugin) {
            if(substr($text,$pos,strlen($plugin)) === $plugin
               && ($endPos = strpos($text,$end,$pos + strlen($plugin))) !== false) {
                $char = substr($text,$pos + strlen($plugin),1); // 1 is strlen of (= or ' ')
                $pos += strlen($plugin) + 1; // 1 is strlen of (= or ' ')
                $argString = substr($text,$endPos - $pos);
                if($char === ' ') { //Multi arg
                    $params = explode('|',trim($argString));
                    $paramDict = array();
                    foreach ($params as $param) {
                        list($k,$v) = array_pad(explode('=',$param),2,null);
                        $paramDict[$k] = $v;
                    }
                    //$output = $plugin->processDictionary($paramDict);
                    var_dump($paramDict);
                } elseif ($char === '=') { //One arg
                    //$output = $plugin->processArg($argString); 
                    echo $argString . "\n";
                } elseif ($char === $end) { //No arg
                    //$output = $plugin->processNoArg();
                    echo $plugin. "\n";
                }
                $pos = $endPos + strlen($end);
                break;
            }
        }
    }
}

processPlugins('{plugin1}');
processPlugins('{plugin2=3}');
processPlugins('{plugin2 arg1=b|arg2=d}');

以前的代码可在PHP沙箱中使用。

该代码似乎可以正常工作（暂时），但是似乎很粗略。您会以不同的方式处理这个问题吗？我可以以某种方式重构此代码吗？

解决方法

如果您选择使用基于正则表达式的字符串操作功能，为什么不使用const isReq = (string) => { const matched = string.match(/^<(.+)>$/); return matched ? matched[1] : false; }; if (command.args) { var everythingAccountedFor = false; const options = command.args.split(' | '); for (const option of options) { const [definer,...values] = option.split(' '); if (definer !== args[0]) continue; if ( values.some((word,index) => isReq(word) && args[index + 1] !== isReq(word)) ) break; everythingAccountedFor = true; break; } if (!everythingAccountedFor) return message.channel.send( `You're message did not provide a required argument.\nHere is the command structure: \`${command.args}\`` ); } 将输入分解为有效部分呢？

这是另一种实现方式：

explode

当然，回声线可能会被丢弃。将它们放置到位后，我们得到以下输出：

function processPlugins($text,$pos = 0,$start = '{',$end = '}') {
  
  $t = substr($text,$pos);
  if($pos > 0) {
    echo "$pos chracters removed from the begining: $t" . PHP_EOL;
  } else {
    echo "Starting with '$t'" . PHP_EOL;
  }
  
  $parts = explode($start,$t);
  $t = $parts[1];
  
  $parts = explode($end,$t);
  $t = $parts[0];

  echo "The part between curly braces: '$t'" . PHP_EOL;
  
  $t = str_replace(['plugin1','plugin2'],'',$t);
  
  echo "After plugin name has been removed: '$t'" . PHP_EOL;
  
  $n = strlen($t);  
  if(!$n) {
    echo "Processing complete: " . trim($parts[0]) . PHP_EOL . PHP_EOL;
    return;
  }
  
  $params = explode('|',$t);
  echo 'Key-Values: ' . json_encode($params) . PHP_EOL;
  
  
  $kv = [];
  foreach($params as $p) {
    list($k,$v) = explode('=',trim($p));
    echo "    Item: '$p',Key: '$k',Value: '$v'" . PHP_EOL;
    
    if($k === '') {
      echo "Processing complete: $v" . PHP_EOL . PHP_EOL;
      return;
    }
    
    $kv[$k] = $v;
    
  }
  
  echo "Processing complete: " . json_encode($kv) . PHP_EOL . PHP_EOL;  
  
}

echo '<pre>';
processPlugins('{plugin1}');
processPlugins('{plugin2=3}');
processPlugins('{plugin2 arg1=b|arg2=d}');

,

此版本适用于具有多个插件令牌的输入。

function processPlugins($text,$end = '}') {
  $processed = [];
  $t = substr($text,$pos);
  $parts = explode($start,$t);
  array_shift($parts);
  foreach($parts as $part) {
    $pparts = explode($end,$part);
    $t = trim($pparts[0]);
    $t = str_replace(['plugin1',$t);
    $n = strlen($t);
    if(!$n) {
      $processed[] = trim($pparts[0]);
      continue;
    }
    $params = explode('|',$t);
    $kv = [];
    foreach($params as $p) {
      list($k,trim($p));
      if(trim($k) === '') {
        $processed[] = trim($v);
        continue 2;
      }
      $kv[trim($k)] = trim($v);
    }
    $processed[] = $kv;  
  }
  return $processed;
}

function test($case) {
  $p = processPlugins($case);
  echo "$case => " . json_encode($p) . PHP_EOL;
}

$cases = [
  '{plugin1}','{plugin2=3}','{plugin2 arg1=b|arg2=d}','text here {plugin1} and more{plugin2=55}here {plugin2 arg1=b|arg2=d} till the end'
];
foreach($cases as $case) {
  test($case);
}

输出：

{plugin1} => ["plugin1"]
{plugin2=3} => ["3"]
{plugin2 arg1=b|arg2=d} => [{"arg1":"b","arg2":"d"}]
text here {plugin1} and more{plugin2=55}here {plugin2 arg1=b|arg2=d} till the end => ["plugin1","55",{"arg1":"b","arg2":"d"}]