PHP Command-Line PHP
Program: DOM Explorer
The dom-explorer.php program provides a shell-like prompt to let you explore an HTML document interactively. It reads an HTML document from a provided URL, parses it into a DOMDocument, and then gives you a prompt at which you can enter commands to see the node structure and contents of the documents.
Additionally, dom-explorer.php uses the Readline word-completion features to more easily enter node locations. Enter a few characters and hit Tab to see a list of nodes that match the characters you’ve typed:
% php dom-explorer.php http://www.php.net
/html > ls
head body
/html > ls head
title style[1] comment()[1] style[2] comment()[2] meta link[1] link[2] link[3] ↵
script[1] link[4] script[2]
/html > cat head/title
PHP: Hypertext Preprocessor
/html > cd body
/html/body > ls
text()[1] div[1] text()[2] div[2] text()[3] div[3] text()[4] div[4] text()[5] ↵
div[5] text()[6] div[6] text()[7] script comment()
/html/body > cd div[2]
/html/body/div[2] > ls
a text()[1] div text()[2]
/html/body/div[2] > cat a
/html/body/div[2] > cat div
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/html/body/div[2] > exit
Example dom-explorer.php
/* Need to specify a URL on the commandline */
isset($argv[1]) or die("No URL specified");
/* Load the HTML and start the command loop */
$explorer = new DomExplorer($argv[1]);
$explorer->loop();
class DomExplorer {
public function __construct($url) {
$html = file_get_contents($url);
if (false === $html) {
throw new Exception("Can't retrieve $url");
}
/* Turn the HTML into valid XHTML */
$clean = tidy_repair_string($html, array('output-xhtml' => true));
/* Load it into a DOMDocument, hiding any libxml
* warnings */
$this->doc = new DOMDocument();
libxml_use_internal_errors(true);
if (false === $this->doc->loadHtml($clean)) {
throw new Exception("Can't parse {$url} as HTML");
}
libxml_use_internal_errors(false);
$this->currentNode = $this->doc->documentElement;
$this->x = new DOMXPath($this->doc);
}
public function loop() {
/* The "completion" function will provide tab-completion at the prompt */
readline_completion_function(array($this, 'completion'));
while (true) {
/* Use the current node as part of the prompt */
$line = readline($this->currentNode->getNodePath() . ' > ');
readline_add_history($line);
/* The first word typed in is the command, the rest are arguments */
$parts = explode(' ', $line);
$cmd = array_shift($parts);
/* Each command is a method, so call it if it exists */
$cmd_function_name = "cmd_$cmd";
if (is_callable(array($this, $cmd_function_name))) {
try {
$this->$cmd_function_name($parts);
} catch (Exception $e) {
print $e->getMessage() . "\n";
}
}
else {
print "Unknown Command: $line\n";
}
}
}
/**
* Command: exit the program
*/
protected function cmd_exit($args) {
exit();
}
/**
* Command: list all nodes under the current node or
* a specified node
*/
protected function cmd_ls($args) {
if (isset($args[0]) && strlen($args[0])) {
$node = $this->resolvePath($args[0]);
}
else {
$node = $this->currentNode;
}
print implode(' ' , $this->getChildNodePaths($node)) . "\n";
}
/**
* Command: change to a new current node
*/
protected function cmd_cd($args) {
/* If an argument is provided, use it */
if (isset($args[0]) && strlen($args[0])) {
$this->currentNode = $this->resolvePath($args[0]);
}
/* Otherwise go back to the "root" */
else {
$this->currentNode = $this->doc->documentElement;
}
}
/**
* Command: print the text content of a node
*/
protected function cmd_cat($args) {
if (isset($args[0]) && strlen($args[0])) {
$node = $this->resolvePath($args[0]);
print $node->textContent . "\n";
}
else {
throw new Exception("cat requires an argument");
}
}
/**
* Get all the paths of the nodes under the provided
* node, trimming off the path of the current node from
* the paths of the child nodes
*/
protected function getChildNodePaths($node) {
$children = array();
$curdir = $node->getNodePath();
foreach ($node->childNodes as $node) {
$path = $node->getNodePath();
$sub = substr($path, strlen($curdir) + 1);
$children[] = $sub;
}
return $children;
}
/**
* When tab is pressed, return an array of child
* node paths as possible completion targets
*/
protected function completion($str, $index) {
return $this->getChildNodePaths($this->currentNode);
}
/**
* Resolve an xpath expression relative to the current
* node, and make sure it only matches 1 target node
*/
protected function resolvePath($arg) {
$matches = $this->x->query($arg, $this->currentNode);
if ($matches === false) {
throw new Exception("Bad expresion: $arg");
}
if ($matches->length == 0) {
throw new Exception("No match for $arg");
}
if ($matches->length > 1) {
throw new Exception("{$matches->length} matches for arg");
}
return $matches->item(0);
}
}
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