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【代碼分享】我未完成的Node節點類 |
 一派掌门 二十级 |
【Node.php】
<?php
class Node implements ArrayAccess {
protected $attributes = array();
protected $children = array(); // Accessed by $this[number]
protected $nodeName = 'div';
protected static function attributeNameWarning() {
triger_error('The name of the attribute cannot be an empty string.', E_USER_WARNING);
}
protected static function nodeNameWarning() {
triger_error('The name of the node cannot be an empty string.', E_USER_WARNING);
}
/*static public function render($string) {
}*/
function __construct($nodeName = 'div') {
$this->setNodeName($nodeName);
}
/* ------ Functions for ArrayAccess ------ */
public function offsetExists($offset) {
if (is_numeric($offset)) {
return isset($this->children[$offset]);
} else {
return $this->hasAttribute($offset);
}
}
public function offsetGet($offset) {
if (is_numeric($offset)) {
return $this->children[$offset];
} else {
return $this->getAttribute($offset);
}
}
public function offsetSet($offset, $value) {
if (is_numeric($offset)) {
$this->children[$offset] = $value;
} else {
return $this->setAttribute($offset, $value);
}
}
public function offsetUnset($offset) {
if (is_numeric($offset)) {
unset($this->children[$offset]);
} else {
$this->removeAttribute($offset);
}
}
/* ------ END OF Functions for ArrayAccess ------ */
public function getAttribute($name) {
$name = trim($name);
if (isset($this->attributes[$name])) {
return $this->attributes[$name];
} else {
return '';
}
}
public function getLength() {
return count($this->children);
}
public function getNodeName() {
return $this->nodeName;
}
public function hasAttribute($name) {
if (empty($name)) {
self::attributeNameWarning();
return;
}
return isset($this->attributes[$name]);
}
public function removeAttribute($name) {
if (empty($name)) {
self::attributeNameWarning();
return;
}
unset($this->attributes[$name]);
}
public function render($indentation = NULL, $noEndingSlash = false) {
$str = $beginning = '';
if (!is_null($indentation) && $indentation > 0) {
$beginning = str_repeat(' ', $indentation);
$str .= $beginning;
}
$str .= '<' . $this->nodeName;
foreach ($this->attributes as $name => $value) {
$str .= " $name";
if (!is_null($value)) {
$str .= "=\"$value\"";
}
}
$len = $this->getLength();
if ($len > 0) {
$str .= '>';
if ($len == 1 && is_string($this->children[0])) {
$str .= $this->children[0];
} else {
$str .= "\n";
foreach ($this->children as $child) {
if ($child instanceof Node) {
if (is_null($indentation)) {
$newIndentation = null;
} else {
$newIndentation = $indentation + 1;
}
$child = $child->render($newIndentation, $noEndingSlash);
} else {
$child = " {$beginning}{$child}\n";
}
$str .= $child;
}
$str .= $beginning;
}
$str .= '</' . $this->nodeName . '>';
} else {
if ($noEndingSlash) {
$str .= '>';
} else {
$str .= ' />';
}
}
$str .= "\n";
return $str;
}
public function setAttribute($name, $value = NULL) {
if (empty($name)) {
self::attributeNameWarning();
return;
}
$this->attributes[$name] = $value;
}
public function setNodeName($newNodeName) {
if (empty($newNodeName)) {
self::nodeNameWarning();
return;
}
$this->nodeName = trim($newNodeName);
}
}
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一派掌门 二十级 |
【HTMLNode.php】
<?php
class HTMLNode extends Node {
public function getID() {
return $this['id'];
}
public function removeID() {
$this->removeAttribute('id');
}
public function render($indentation = 0, $noEndingSlash = true) {
return parent::render($indentation, $noEndingSlash);
}
public function setID($newID) {
if (is_null($newID)) {
$this->removeID();
} else {
$this['id'] = $newID;
}
}
}
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一派掌门 二十级 |
【test.php】
<?php
require_once('classes/Node.php');
require_once('classes/HTMLNode.php');
?>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
</head>
<body>
<?php
$form = new HTMLNode('form');
$form[0] = 'Here is some text.';
$form->setID('Col');
$form['action'] = 'a.php';
$form[1] = new HTMLNode('h4');
$form[1][0] = 'I\'m too sad!';
$form[2] = new HTMLNode('p');
$form[2][0] = 'Are you really ';
$form[2][1] = new HTMLNode('span');
$form[2][1][0] = 'sad';
$form[2][1]['style'] = 'color:#FF0000;font-weight:bold';
$form[2][2] = '?';
echo $form->render();
?>
</body>
</html>
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一派掌门 二十级 |
輸出： <!doctype html> <html> <head> <meta charset="utf-8"> <title>Untitled Document</title> </head> <body> <form id="Col" action="a.php"> Here is some text. <h4>I'm too sad!</h4> <p> Are you really <span style="color:#FF0000;font-weight:bold">sad</span> ? </p> </form> </body> </html> |
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一派掌门 二十级 |
【代碼解釋】
$form = new HTMLNode('form'); // 創建一個form節點
$form[0] = 'Here is some text.'; // form節點的的第0個子節點為文本節點，內容為Here is some text.
$form->setID('Col'); // 設置form節點的id
$form['action'] = 'a.php'; // 設置form節點的action屬性
$form[1] = new HTMLNode('h4'); // form節點的的第1個子節點為一個h4節點
$form[1][0] = 'I\'m too sad!'; // 設置這個h4節點的內容（也就是創建一個文本節點）
$form[2] = new HTMLNode('p');
$form[2][0] = 'Are you really ';
$form[2][1] = new HTMLNode('span');
$form[2][1][0] = 'sad';
$form[2][1]['style'] = 'color:#FF0000;font-weight:bold';
$form[2][2] = '?';
echo $form->render(); // 輸出form節點的全部內容，并進行自動縮進
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一派掌门 二十级 |
本代碼最重要的函數就是Node類的render方法。
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一派掌门 二十级 |
echo $form[2][1]->render();
對這個span標籤單獨進行render:
<span style="color:#FF0000;font-weight:bold">sad</span>
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一派掌门 二十级 |
$span = $form[2][1]; $span[1] = new HTMLNode('a'); $a = $span[1]; $a[0] = '打開鏈接'; $a['target'] = '_blank'; $a['href'] = ' https://zh.arslanbar.net/post.php?t=23306'; $a['style'] = 'color:#00FF00'; $a->setID('hahaha'); echo $span->render(); 上面的代碼把那個span標籤拿出來修改，加了一個a標籤，然後再單獨輸出這個span標籤。 輸出內容： <span style="color:#FF0000;font-weight:bold"> sad <a target="_blank" href=" https://zh.arslanbar.net/post.php?t=23306" style="color:#00FF00" id="hahaha">打開鏈接</a> </span> |
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一派掌门 二十级 |
回復：8樓 值得注意的是，由於$span是從$form中提取出來的，所以修改了$span也就修改了$form[2][1]，因此執行echo $form->render();后輸出的內容已經發生變化： <form id="Col" action="a.php"> Here is some text. <h4>I'm too sad!</h4> <p> Are you really <span style="color:#FF0000;font-weight:bold"> sad <a target="_blank" href=" https://zh.arslanbar.net/post.php?t=23306" style="color:#00FF00" id="hahaha">打開鏈接</a> </span> ? </p> </form> |
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