將java函數轉換爲PHP的破折號編碼

Question

我想將java函數轉換爲等效的PHP函數。

的Java：

/** 
* Dash Encoding: 
* 
* Zeta-Jones <=> Zeta--Jones 
* Blade - The Last Installment <=> Blade---The-Last-Installment 
* Wrongo -Weird => Wrongo---Weird (decodes to => Wrongo - Weird) 
* Wrongo- Weird => Wrongo---Weird (decodes to => Wrongo - Weird) 
*/ 
private static Pattern dashes = Pattern.compile("--+"); // "--" => "-" 
private static Pattern blanks = Pattern.compile("\\s\\s+"); // " " => " " 

private static Pattern hyphen = Pattern.compile("(?<=[^-\\s])-(?=[^-\\s])"); // like "Zeta-Jones" 
private static Pattern dash = Pattern.compile("[\\s]-[\\s]|-[\\s]|[\\s]-"); // like "Blade - The Last Installment" 
private static Pattern blank = Pattern.compile("\\s+"); 


public static String dashEncode(String s) { 
if (s == null) return s; 
s = blank.matcher(
    hyphen.matcher(
     dash.matcher(
      dashes.matcher(
       blanks.matcher(s.trim()).replaceAll(" ") // compress embedded whitespace " " => " " 
      ).replaceAll("-") // trim and compress multiple dashes "---" => "-" 
     ).replaceAll("---") // replace dash with surrounding white space => "---" 
    ).replaceAll("--") // replace single "-" => "--" 
    ).replaceAll("-"); // replace blanks with "-" 
return s; 
} 

到目前爲止，我有：

PHP

function dashEncode($str) { 
    // replace blanks with "-" 
    $str = str_replace(' ', '-', $str); 

    // replace single "-" => "--" 
    $str = str_replace('-', '--', $str); 

    return $str; 
} 

任何幫助表示讚賞。由於

Answer 1

我不知道Java的非常好，但Pattern.matcher()是Java功能使用replaceAll()總是，這可以寫成PHP preg_replace()。基本就是這樣。

當您複製正則表達式模式時，請添加分隔符，因爲preg_replace需要這些分隔符。旁邊的表達式看起來是兼容的。

/** 
* Dash Encoding: 
* 
* Zeta-Jones <=> Zeta--Jones 
* Blade - The Last Installment <=> Blade---The-Last-Installment 
* Wrongo -Weird => Wrongo---Weird (decodes to => Wrongo - Weird) 
* Wrongo- Weird => Wrongo---Weird (decodes to => Wrongo - Weird) 
*/ 
function dashEncode($s) { 
    static $pattern = array(
     'dashes' => "--+",  // "--" => "-" 
     'blanks' => "\\s\\s+", // " " => " " 

     'hyphen' => "(?<=[^-\\s])-(?=[^-\\s])", // like "Zeta-Jones" 
     'dash' => "[\\s]-[\\s]|-[\\s]|[\\s]-", // like "Blade - The Last Installment" 
     'blank' => "\\s+" 
    ); 

    $matcher = function($name, $s, $with) use ($pattern) { 
     isset($pattern[$name]) || die("pattern '$name' undefined."); 
     return preg_replace("~{$pattern[$name]}~", $with, $s); 
    }; 

    $s = 
    $matcher('blank', 
     $matcher('hyphen', 
      $matcher('dash', 
       $matcher('dashes', 
        $matcher('blanks', trim($s), " ") // compress embedded whitespace " " => " " 
       , "-") // trim and compress multiple dashes "---" => "-" 
      , "---") // replace dash with surrounding white space => "---" 
     , "--") // replace single "-" => "--" 
    , "-"); // replace blanks with "-"$matcher('blanks', trim($s), " "); // compress embedded whitespace " " => " " 
    return $s; 
}