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| <?php
/* */
/* Titre : Tronquer une chaîne de caractères HTML */
/* */
/* Auteur : forty */
/* Date édition : 21 Mai 2008 */
/* */
/*
* Script base sur le parser html disponible ici :
http://php-html.sourceforge.net/
*/
define ("NODE_TYPE_START",0);
define ("NODE_TYPE_ELEMENT",1);
define ("NODE_TYPE_ENDELEMENT",2);
define ("NODE_TYPE_TEXT",3);
define ("NODE_TYPE_COMMENT",4);
define ("NODE_TYPE_DONE",5);
define ("NODE_TYPE_ELEMENT_END",6);
/**
* Class HtmlParser.
* To use, create an instance of the class passing
* HTML text. Then invoke parse() until it's false.
* When parse() returns true, $iNodeType, $iNodeName
* $iNodeValue and $iNodeAttributes are updated.
*
* To create an HtmlParser instance you may also
* use convenience functions HtmlParser_ForFile
* and HtmlParser_ForURL.
*/
class HtmlParser {
/**
* Field iNodeType.
* May be one of the NODE_TYPE_* constants above.
*/
var $iNodeType;
/**
* Field iNodeName.
* For elements, it's the name of the element.
*/
var $iNodeName = "";
/**
* Field iNodeValue.
* For text nodes, it's the text.
*/
var $iNodeValue = "";
/**
* Field iNodeAttributes.
* A string-indexed array containing attribute values
* of the current node. Indexes are always lowercase.
*/
var $iNodeAttributes;
/**
* Field iNodeStart.
* The position of the first char.
*/
var $iNodeStart;
/**
* Field iNodeEnd.
* The position of the last char.
*/
var $iNodeEnd;
// The following fields should be
// considered private:
var $iHtmlText;
var $iHtmlTextLength;
var $iHtmlTextIndex = 0;
var $iHtmlCurrentChar;
var $BOE_ARRAY;
var $B_ARRAY;
var $BOS_ARRAY;
var $no_comment = false;
//Liste des balises autofermantes
var $BalisesSimples = array('hr', 'br', 'input', 'meta', 'link', 'img',
'area', 'param');
/**
* Constructor.
* Constructs an HtmlParser instance with
* the HTML text given.
*/
function HtmlParser ($aHtmlText) {
$this->iHtmlText = $aHtmlText;
$this->iHtmlTextLength = strlen($aHtmlText);
$this->iNodeAttributes = array();
$this->setTextIndex (0);
$this->BOE_ARRAY = array (" ", "\t", "\r", "\n", "=" );
$this->B_ARRAY = array (" ", "\t", "\r", "\n" );
$this->BOS_ARRAY = array (" ", "\t", "\r", "\n", "/" );
}
/**
* Method parse.
* Parses the next node. Returns false only if
* the end of the HTML text has been reached.
* Updates values of iNode* fields.
*/
function parse() {
$this->iNodeStart = $this->iHtmlTextIndex;
$text = $this->skipToElement();
if ($text != "") {
$this->iNodeType = NODE_TYPE_TEXT;
$this->iNodeName = "Text";
$this->iNodeValue = $text;
$this->iNodeEnd = $this->iHtmlTextIndex;
return true;
}
return $this->readTag();
}
function clearAttributes() {
$this->iNodeAttributes = array();
}
function readTag() {
if ($this->iCurrentChar != "<") {
$this->iNodeType = NODE_TYPE_DONE;
return false;
}
$this->clearAttributes();
$this->skipMaxInTag ("<", 1);
if ($this->iCurrentChar == '/') {
$this->moveNext();
$name = $this->skipToBlanksInTag();
if (strtolower($name) == 'script') {
$this->no_comment = false;
}
$this->iNodeType = NODE_TYPE_ENDELEMENT;
$this->iNodeName = $name;
$this->iNodeValue = "";
$this->skipEndOfTag();
$this->iNodeEnd = $this->iHtmlTextIndex;
return true;
}
$name = $this->skipToBlanksOrSlashInTag();
if (!$this->isValidTagIdentifier ($name)) {
$comment = false;
if ((strpos($name, "!--") === 0) && (!$this->no_comment)) {
$ppos = strpos($name, "--", 3);
if (strpos($name, "--", 3) === (strlen($name) - 2)) {
$this->iNodeType = NODE_TYPE_COMMENT;
$this->iNodeName = "Comment";
$this->iNodeValue = "<" . $name . ">";
$comment = true;
} else {
$rest = $this->skipToStringInTag ("-->");
if ($rest != "") {
$this->iNodeType = NODE_TYPE_COMMENT;
$this->iNodeName = "Comment";
$this->iNodeValue = "<" . $name . $rest;
$comment = true;
// Already skipped end of tag
$this->iNodeEnd = $this->iHtmlTextIndex;
return true;
}
}
}
if (!$comment) {
$this->iNodeType = NODE_TYPE_TEXT;
$this->iNodeName = "Text";
$this->iNodeValue = "<" . $name;
$this->iNodeEnd = $this->iHtmlTextIndex;
return true;
}
} else {
if (strtolower($name) == 'script') {
$this->no_comment = true;
}
$this->iNodeType = NODE_TYPE_ELEMENT;
$this->iNodeValue = "";
$this->iNodeName = $name;
while ($this->skipBlanksInTag()) {
$attrName = $this->skipToBlanksOrEqualsInTag();
if ($attrName != "" && $attrName != "/") {
$this->skipBlanksInTag();
if ($this->iCurrentChar == "=") {
$this->skipEqualsInTag();
$this->skipBlanksInTag();
$value = $this->readValueInTag();
$this->iNodeAttributes[strtolower($attrName)] = $value;
} else {
$this->iNodeAttributes[strtolower($attrName)] = "";
$this->setTextIndex ($this->iHtmlTextIndex - 1);
}
}
}
}
if (($this->iHtmlText{$this->iHtmlTextIndex - 1} == '/') || (in_array(
$this->iNodeName, $this->BalisesSimples))) {
$this->iNodeType = NODE_TYPE_ELEMENT_END;
}
$this->skipEndOfTag();
$this->iNodeEnd = $this->iHtmlTextIndex;
return true;
}
function isValidTagIdentifier ($name) {
return ereg ("^[A-Za-z0-9_\\-]+$", $name);
}
function skipBlanksInTag() {
return "" != ($this->skipInTag ($this->B_ARRAY));
}
function skipToBlanksOrEqualsInTag() {
return $this->skipToInTag ($this->BOE_ARRAY);
}
function skipToBlanksInTag() {
return $this->skipToInTag ($this->B_ARRAY);
}
function skipToBlanksOrSlashInTag() {
return $this->skipToInTag ($this->BOS_ARRAY);
}
function skipEqualsInTag() {
return $this->skipMaxInTag ("=", 1);
}
function readValueInTag() {
$ch = $this->iCurrentChar;
$value = "";
if ($ch == "\"") {
$this->skipMaxInTag ("\"", 1);
$value = $this->skipToInTag ("\"");
$this->skipMaxInTag ("\"", 1);
} elseif ($ch == "'") {
$this->skipMaxInTag ("'", 1);
$value = $this->skipToInTag ("'");
$this->skipMaxInTag ("'", 1);
} else {
$value = $this->skipToBlanksInTag();
}
return $value;
}
function setTextIndex ($index) {
$this->iHtmlTextIndex = $index;
if ($index >= $this->iHtmlTextLength) {
$this->iCurrentChar = -1;
} else {
$this->iCurrentChar = $this->iHtmlText{$index};
}
}
function moveNext() {
if ($this->iHtmlTextIndex < $this->iHtmlTextLength) {
$this->setTextIndex ($this->iHtmlTextIndex + 1);
return true;
} else {
return false;
}
}
function skipEndOfTag() {
while (($ch = $this->iCurrentChar) !== -1) {
if ($ch == ">") {
$this->moveNext();
return;
}
$this->moveNext();
}
}
function skipInTag ($chars) {
$sb = "";
while (($ch = $this->iCurrentChar) !== -1) {
if ($ch == ">") {
return $sb;
} else {
$match = false;
for ($idx = 0; $idx < count($chars); $idx++) {
if ($ch == $chars[$idx]) {
$match = true;
break;
}
}
if (!$match) {
return $sb;
}
$sb .= $ch;
$this->moveNext();
}
}
return $sb;
}
function skipMaxInTag ($chars, $maxChars) {
$sb = "";
$count = 0;
while (($ch = $this->iCurrentChar) !== -1 && $count++ < $maxChars) {
if ($ch == ">") {
return $sb;
} else {
$match = false;
for ($idx = 0; $idx < count($chars); $idx++) {
if ($ch == $chars[$idx]) {
$match = true;
break;
}
}
if (!$match) {
return $sb;
}
$sb .= $ch;
$this->moveNext();
}
}
return $sb;
}
function skipToInTag ($chars) {
$sb = "";
while (($ch = $this->iCurrentChar) !== -1) {
$match = $ch == ">";
if (!$match) {
for ($idx = 0; $idx < count($chars); $idx++) {
if ($ch == $chars[$idx]) {
$match = true;
break;
}
}
}
if ($match) {
return $sb;
}
$sb .= $ch;
$this->moveNext();
}
return $sb;
}
function skipToElement() {
$sb = "";
while (($ch = $this->iCurrentChar) !== -1) {
if ($ch == "<") {
return $sb;
}
$sb .= $ch;
$this->moveNext();
}
return $sb;
}
/**
* Returns text between current position and $needle,
* inclusive, or "" if not found. The current index is moved to a point
* after the location of $needle, or not moved at all
* if nothing is found.
*/
function skipToStringInTag ($needle) {
$pos = strpos ($this->iHtmlText, $needle, $this->iHtmlTextIndex);
if ($pos === false) {
return "";
}
$top = $pos + strlen($needle);
$retvalue = substr ($this->iHtmlText, $this->iHtmlTextIndex, $top -
$this->iHtmlTextIndex);
$this->setTextIndex ($top);
return $retvalue;
}
}
function HtmlParser_ForFile ($fileName) {
return HtmlParser_ForURL($fileName);
}
function HtmlParser_ForURL ($url) {
$fp = fopen ($url, "r");
$content = "";
while (true) {
$data = fread ($fp, 8192);
if (strlen($data) == 0) {
break;
}
$content .= $data;
}
fclose ($fp);
return new HtmlParser ($content);
}
function TronqueHtml($chaine, $max, $separateur = ' ', $suffix = ' ...') {
if (strlen(strip_tags($chaine)) > $max) {
$tabElements = array();
$cur_len = 0;
$parser = new HtmlParser($chaine);
while ($parser->parse()) {
if ($parser->iNodeType == NODE_TYPE_ELEMENT) {
array_push($tabElements, $parser->iNodeName);
} elseif ($parser->iNodeType == NODE_TYPE_ENDELEMENT) {
while (array_pop($tabElements) != $parser->iNodeName) {
if (count($tabElements) < 1) {
echo 'Erreur : pas de balise ouvrante pour ' . $parser->
iNodeName;
}
}
} elseif ($parser->iNodeType == NODE_TYPE_TEXT) {
$cur_max = $cur_len + $parser->iNodeEnd - $parser->iNodeStart;
if ($cur_max == $max) {
$resultat = substr($chaine, 0, $parser->iNodeEnd) . $suffix;
while (($balise = array_pop($tabElements)) !== null) {
$resultat .= '</' . $balise . '>';
}
return $resultat;
} elseif ($cur_max > $max) {
if (($pos = strrpos(substr($parser->iNodeValue, 0, ($max -
$cur_len + strlen( $separateur ))), $separateur)) !== false) {
$resultat = substr($chaine, 0, $parser->iNodeStart +
$pos) . $suffix;
while (($balise = array_pop($tabElements)) !== null) {
$resultat .= '</' . $balise . '>';
}
return $resultat;
} else {
$resultat = substr($chaine, 0, $parser->iNodeEnd) .
$suffix;
while (($balise = array_pop($tabElements)) !== null) {
$resultat .= '</' . $balise . '>';
}
return $resultat;
}
} else {
$cur_len += $parser->iNodeEnd - $parser->iNodeStart;
}
}
}
}
return $chaine;
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Test tronque html</title>
</head>
<body>
<?php
$chaine = '<h2>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. </h2>
<p>
<span class="Style1">Praesent tortor purus, <strong>commodo</strong> quis,' .
' interdum et, tincidunt ut, lacus.
Etiam condimentum volutpat dolor. Proin faucibus libero eu lectus.<br />
<em>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. <strong>Nam' .
' aliquam tellus eget ligula</strong>. Phasellus pretium neque ut felis.' .
' Quisque lacinia congue ante. Lorem ipsum dolor sit amet, consectetuer' .
' adipiscing elit. Quisque at metus quis tortor auctor faucibus.</em></span><b' .
'r />
Curabitur quis lectus. Integer felis est, congue id, luctus quis, congue' .
' volutpat, lacus. Curabitur malesuada felis semper nisl. Aenean laoreet. Nunc' .
' vitae nisi. <br />
</p>';
echo "Tronqué à 280 caractères (hors balises) :<br>\n";
echo TronqueHtml($chaine, 280, ' ', ' ...');
echo "\n<hr>\n";
echo $chaine;
?>
</body>
</html> |
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