Home > php教程 > php手册 > Html Parser Class

Html Parser Class

WBOY
Release: 2016-06-21 09:05:40
Original
908 people have browsed it

This is a HTML parser class, used to parse HTML and XML. One of the unique features of this class is that it supports the innerHTML property.

php

/**
 * HTML/XML Parser Class
 *
 * This is a helper class that is used to parse HTML and XML. A unique feature of this parsing class 
 * is the fact that it includes support for innerHTML (which isn't easy to do).
 *
 * @author Dennis Pallett
 * @copyright Dennis Pallett 2006
 * @package HTML_Parser
 * @version 1.0
 */

// Helper Class
// To parse HTML/XML
Class HTML_Parser 
{
    
// Private properties
    
var $_parser
;
    var 
$_tags 
= array();
    var 
$_html
;
    var 
$output 
= array();
    var 
$strXmlData
;
    var 
$_level 0
;
    var 
$_outline
;
    var 
$_tagcount 
= array();
    var 
$xml_error false
;
    var 
$xml_error_code
;
    var 
$xml_error_string
;
    var 
$xml_error_line_number
;

    function 
get_html 
() {
        return 
$this->_html
;
    }

    function 
parse($strInputXML
) {
        
$this->output 
= array();

        
// Translate entities
        
$strInputXML $this->translate_entities($strInputXML
);

        
$this->_parser xml_parser_create 
();
        
xml_parser_set_option($this->_parserXML_OPTION_CASE_FOLDINGtrue
);
        
xml_set_object($this->_parser,$this
);
        
xml_set_element_handler($this->_parser"tagOpen""tagClosed"
);
          
        
xml_set_character_data_handler($this->_parser"tagData"
);
      
        
$this->strXmlData xml_parse($this->_parser,$strInputXML 
);

        if (!
$this->strXmlData
) {
            
$this->xml_error true
;
            
$this->xml_error_code xml_get_error_code($this->_parser
);
            
$this->xml_error_string xml_error_string(xml_get_error_code($this->_parser
));
            
$this->xml_error_line_number =  xml_get_current_line_number($this->_parser
);
            return 
false
;
        }

        return 
$this->output
;
    }


    function 
tagOpen($parser$name$attr
) {
        
// Increase level
        
$this->_level
++;

        
// Create tag:
        
$newtag $this->create_tag($name$attr
);

        
// Build tag
        
$tag = array("name"=>$name,"attr"=>$attr"level"=>$this->_level
);

        
// Add tag
        
array_push ($this->output$tag
);

        
// Add tag to this level
        
$this->_tags[$this->_level] = $tag
;

        
// Add to HTML
        
$this->_html .= $newtag
;

        
// Add to outline
        
$this->_outline .= $this->_level $newtag
;
    }

    function 
create_tag ($name$attr
) {
        
// Create tag:
        # Begin with name
        
$tag 'strtolower($name) . ' ';

        
# Create attribute list
        
foreach ($attr as $key=>$val
) {
            
$tag .= strtolower($key) . '="' htmlentities($val) . '" '
;
        }

        
# Finish tag
        
$tag trim($tag
);
        
        switch(
strtolower($name
)) {
            case 
'br'
:
            case 
'input'
:
                
$tag .= ' /'
;
            break;
        }

        
$tag .= '>'
;

        return 
$tag
;
    }

    function 
tagData($parser$tagData
) {
        if(
trim($tagData
)) {
            if(isset(
$this->output[count($this->output)-1]['tagData'
])) {
                
$this->output[count($this->output)-1]['tagData'] .= $tagData
;
            } else {
                
$this->output[count($this->output)-1]['tagData'] = $tagData
;
            }
        }

        
$this->_html .= htmlentities($tagData
);
        
$this->_outline .= htmlentities($tagData
);
    }
  
    function 
tagClosed($parser$name
) {
        
// Add to HTML and outline
        
switch (strtolower($name
)) {
            case 
'br'
:
            case 
'input'
:
                break;
            default:
            
$this->_outline .= $this->_level '' strtolower($name) . '>'
;
            
$this->_html .= '' strtolower($name) . '>'
;
        }

        
// Get tag that belongs to this end
        
$tag $this->_tags[$this->_level
];
        
$tag $this->create_tag($tag['name'], $tag['attr'
]);

        
// Try to get innerHTML
        
$regex '%' preg_quote($this->_level $tag'%') . '(.*?)' preg_quote($this->_level '' strtolower($name) . '>''%') . '%is'
;
        
preg_match ($regex$this->_outline$matches
);

        
// Get innerHTML
        
if (isset($matches['1'
])) {
            
$innerhtml $matches['1'
];
        }
        
        
// Remove level identifiers
        
$this->_outline str_replace($this->_level $tag$tag$this->_outline
);
        
$this->_outline str_replace($this->_level '' strtolower($name) . '>''' strtolower($name) . '>'$this->_outline
);

        
// Add innerHTML
        
if (isset($innerhtml
)) {
            
$this->output[count($this->output)-1]['innerhtml'] = $innerhtml
;
        }

        
// Fix tree
        
$this->output[count($this->output)-2]['children'][] = $this->output[count($this->output)-1
];
        
array_pop($this->output
);

        
// Decrease level
        
$this->_level
--;
    }

    function 
translate_entities($xmlSource$reverse =FALSE
) {
        static 
$literal2NumericEntity
;
        
        if (empty(
$literal2NumericEntity
)) {
            
$transTbl get_html_translation_table(HTML_ENTITIES
);

            foreach (
$transTbl as $char => $entity
) {
                if (
strpos('&"'$char) !== FALSE
) continue;
                    
$literal2NumericEntity[$entity] = ''.ord($char).';'
;
                }
            }

            if (
$reverse
) {
                return 
strtr($xmlSourcearray_flip($literal2NumericEntity
));
            } else {
                return 
strtr($xmlSource$literal2NumericEntity
);
            }
      }
}

// To be used like this
$parser = new HTML_Parser
;
$output $parser->parse($html
);

print_r ($output
);

?>



Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Recommendations
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template