Функции парсинга веб страниц.

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Может у кого то есть рецепт для проверки урла на запрет в robots.txt ?
 
часа 4 читал доку 5 часов писал...
но теперь и парсер и граббер и 20к страниц + графика у мя в кармане.
Все очень доступно написано. Хватило 30 минут на юзанье примеров. Всем рекомендую.
Единственный вопрос, который возник: как из распарсенного куска
Код:
$text=$html->find('div[class="wrap"] b')->innertext
из $txt вырезать например <div="comments"> тескт </div>, чтобы он удалился из переменно $text
 
Код:
<?php
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);
class HtmlParser {
    var $iNodeType;
    var $iNodeName = "";
    var $iNodeValue = "";
    var $iNodeAttributes;
    var $iHtmlText;
    var $iHtmlTextLength;
    var $iHtmlTextIndex = 0;
    var $iHtmlCurrentChar;
    var $BOE_ARRAY;
    var $B_ARRAY;
    var $BOS_ARRAY;
    function HtmlParser ($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", "/" );
    }
    function parse() {
        $text = $this->skipToElement();
        if ($text != "") {
            $this->iNodeType = NODE_TYPE_TEXT;
            $this->iNodeName = "Text";
            $this->iNodeValue = $text;
            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();
            $this->iNodeType = NODE_TYPE_ENDELEMENT;
            $this->iNodeName = $name;
            $this->iNodeValue = "";
            $this->skipEndOfTag();
            return true;
        }
        $name = $this->skipToBlanksOrSlashInTag();
        if (!$this->isValidTagIdentifier ($name)) {
                $comment = false;
                if (strpos($name, "!--") === 0) {
                    $ppos = strpos($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;
                            $comment = true;
                            // Already skipped end of tag
                            return true;
                        }
                    }
                }
                if (!$comment) {
                    $this->iNodeType = NODE_TYPE_TEXT;
                    $this->iNodeName = "Text";
                    $this->iNodeValue = "<" . $name;
                    return true;
                }
        }
        else {
                $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)] = "";
                        }
                    }
                }
        }
        $this->skipEndOfTag();
        return true;
    }
    function isValidTagIdentifier ($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 ("\"");
            $this->skipMaxInTag ("\"", 1);
        }
        else if ($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);
}
php?>
оин из лучших вариантов. Разбирать можно по всякому, вот пример:
$parser= new HtmlParser ($html_code);
while ($parser->parse()) {
print_r($parser);
print $parser->iNodeName);
print $parser->iNodeAttributes["name"]);
print $parser->iNodeAttributes["type"]);
print $parser->iNodeAttributes["value"]);
}

ничего парсер ещё бы доделать интерфейс и сделать.. сделать описание каждой функции было бы шикарно.. И прямь на продажу...
 
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