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parser
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@voitto
voitto committed Aug 17, 2010
1 parent de7af3d commit b0c6d25
Showing 1 changed file with 348 additions and 0 deletions.
348 changes: 348 additions & 0 deletions db/library/parser.php
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@@ -0,0 +1,348 @@
<?php

define('STATE_STOP', 0);
define('STATE_START', 1);

define('STATE_TAG', 2);
define('STATE_OPENING_TAG', 3);
define('STATE_CLOSING_TAG', 4);
define('STATE_TAG_CLEANUP', 5);

define('STATE_ATTRIBUTE', 6);

define('STATE_PI', 7);
define('STATE_JASP', 8);
define('STATE_ESCAPE', 9);

class StartingState {
function parse(&$context) {
$data = $context->scanUntilString('<');
if ($data != '') {
$context->handler_object_data->{$context->handler_method_data}($this, $data);
}
$context->IgnoreCharacter();
return STATE_TAG;
}
}

class TagState {
function parse(&$context) {
switch($context->ScanCharacter()) {
case '/':
return STATE_CLOSING_TAG;
break;
case '?':
return STATE_PI;
break;
case '%':
return STATE_JASP;
break;
case '!':
return STATE_ESCAPE;
break;
default:
$context->unscanCharacter();
return STATE_OPENING_TAG;
}
}
}

class ClosingTagState {
function parse(&$context) {
$tag = $context->scanUntilString('>');
if ($tag != '') {
$context->handler_object_element->{$context->handler_method_closing}($this, $tag);
}
return STATE_TAG_CLEANUP;
}
}

class OpeningTagState {

var $attributes = array();

function attributeHandler($attributename, $attributevalue) {
$this->attributes[$attributename] = $attributevalue;
}

function parse(&$context) {
$tag = $context->scanUntilCharacters("/> \n\r\t");
if ($tag != '') {
$this->attributes = array();
$context->_parse(STATE_ATTRIBUTE);
$context->handler_object_element->{$context->handler_method_opening}($this, $tag, $this->attributes);
}
return STATE_TAG_CLEANUP;
}
}

class TagCleanupState {
function parse(&$context) {
$char = $context->scanCharacter();
if ($char == '/') {
$char = $context->scanCharacter();
if ($char != '>') {
$context->unscanCharacter();
}
}
return STATE_START;
}
}

class AttributeStartState {

var $attribute_handler;

function parse(&$context) {
$context->ignoreWhitespace();
$attributename = $context->scanUntilCharacters("=/> \n\r\t");
if ($attributename == '') {
return STATE_STOP;
} else {
$attributevalue = NULL;
$context->ignoreWhitespace();
$char = $context->scanCharacter();
if ($char == '=') {
$context->ignoreWhitespace();
$char = $context->ScanCharacter();
if ($char == '"') {
$attributevalue= $context->scanUntilString('"');
$context->IgnoreCharacter();
} else if ($char == "'") {
$attributevalue = $context->scanUntilString("'");
$context->IgnoreCharacter();
} else {
$context->unscanCharacter();
$attributevalue = $context->scanUntilCharacters("/> \n\r\t");
}
}
$this->attribute_handler->attributeHandler($attributename, $attributevalue);
return STATE_ATTRIBUTE;
}
}
}

class JaspState {
function parse(&$context) {
$text = $context->scanUntilString('%>');
if ($text != '') {
$context->handler_object_element->{$context->handler_method_jasp}($this, $text);
}
$context->IgnoreCharacter();
$context->IgnoreCharacter();
return STATE_START;
}
}

class PiState {
function parse(&$context) {
$target = $context->scanUntilCharacters(" \n\r\t");
$context->IgnoreCharacter();
$data = $context->scanUntilString('?>');
if ($data != '') {
$context->handler_object_element->{$context->handler_method_pi}($this, $target, $data);
}
$context->IgnoreCharacter();
$context->IgnoreCharacter();
return STATE_START;
}
}

class EscapeState {
function parse(&$context) {
$char = $context->ScanCharacter();
if ($char == '-') {
$char = $context->ScanCharacter();
if ($char == '-') {
$text = $context->scanUntilString('-->');
$context->IgnoreCharacter();
$context->IgnoreCharacter();
} else {
$context->unscanCharacter();
$text = $context->scanUntilString('>');
}
} else {
$text = $context->scanUntilString('>');
}
$context->IgnoreCharacter();
if ($text != '') {
$context->handler_object_element->{$context->handler_method_escape}($this, $text);
}
return STATE_START;
}
}

class StateParser {
var $rawtext;
var $position;
var $length;

var $State = array();

function unscanCharacter() {
$this->position -= 1; // $this->position--; is broken?
}

function ignoreCharacter() {
$this->position += 1;
}

function scanCharacter() {
if ($this->position < $this->length) {
return $this->rawtext{$this->position++};
}
}

function scanUntilCharacters($string) {
$startpos = $this->position;
while ($this->position < $this->length && strpos($string, $this->rawtext{$this->position}) === FALSE) {
$this->position++;
}
return substr($this->rawtext, $startpos, $this->position - $startpos);
}

function scanUntilString($str) {
$start = $this->position;
$this->position = strpos($this->rawtext, $str, $start);
if ($this->position === FALSE) {
$this->position = $this->length;
}
return substr($this->rawtext, $start, $this->position - $start);
}

function ignoreWhitespace() {
while ($this->position < $this->length &&
strpos(" \n\r\t", $this->rawtext{$this->position}) !== FALSE) {
$this->position++;
}
}

function parse($test) {
$this->rawtext = $test;
$this->length = strlen($test);
$this->position = 0;
$this->_parse();
}

function _parse($state = STATE_START) {
do {
$state = $this->State[$state]->parse($this);
} while ($state != STATE_STOP && $this->position < $this->length);
}

}

class TrimDecorator {
var $original_obj;
var $original_method;

function TrimDecorator(&$original_obj, $original_method) {
$this->original_obj =& $original_obj;
$this->original_method = $original_method;
}

function TrimData(&$parser, $data) {
$data = trim($data);
if ($data != '') {
$this->original_obj->{$this->original_method}($this, $data);
}
}
}

class NullHandler {
function DoNothing($text) {
}
}

class HtmlParser extends StateParser {
var $handler_object_element;
var $handler_method_closing;
var $handler_method_opening;

var $handler_object_data;
var $handler_method_data;

var $handler_object_pi;
var $handler_method_pi;

var $handler_object_jasp;
var $handler_method_jasp;

var $handler_object_escape;
var $handler_method_escape;

var $handler_default;

var $parser_options;

function HtmlParser() {
$nullhandler =& new NullHandler();
$this->set_element_handler($nullhandler, 'DoNothing', 'DoNothing');
$this->set_data_handler($nullhandler, 'DoNothing');
$this->set_pi_handler($nullhandler, 'DoNothing');
$this->set_jasp_handler($nullhandler, 'DoNothing');
$this->set_escape_handler($nullhandler, 'DoNothing');

$this->State[STATE_START] =& new StartingState();

$this->State[STATE_CLOSING_TAG] =& new ClosingTagState();
$this->State[STATE_TAG] =& new TagState();
$this->State[STATE_OPENING_TAG] =& new OpeningTagState();
$this->State[STATE_TAG_CLEANUP] =& new TagCleanupState();

$this->State[STATE_ATTRIBUTE] =& new AttributeStartState();
$this->State[STATE_ATTRIBUTE]->attribute_handler =& $this->State[STATE_OPENING_TAG];

$this->State[STATE_PI] =& new PiState();
$this->State[STATE_JASP] =& new JaspState();
$this->State[STATE_ESCAPE] =& new EscapeState();

$this->parser_options['trimDataNodes'] = FALSE;
}

function set_object(&$object) {
$this->handler_default =& $object;
}

function set_option($name, $value) {
$this->parser_options[$name] = $value;
}

function set_data_handler($data_method) {
$this->handler_object_data =& $this->handler_default;
$this->handler_method_data = $data_method;
}

function set_element_handler($opening_method, $closing_method) {
$this->handler_object_element =& $this->handler_default;
$this->handler_method_opening = $opening_method;
$this->handler_method_closing = $closing_method;
}

function set_pi_handler($pi_method) {
$this->handler_object_pi =& $this->handler_default;
$this->handler_method_pi = $pi_method;
}

function set_escape_handler($escape_method) {
$this->handler_object_escape =& $this->handler_default;
$this->handler_method_escape = $escape_method;
}

function set_jasp_handler ($jasp_method) {
$this->handler_object_jasp =& $this->handler_default;
$this->handler_method_jasp = $jasp_method;
}

function parse($data) {
if ($this->parser_options['trimDataNodes']) {
$decorator =& new TrimDecorator($this->handler_object_data, $this->handler_method_data);
$this->handler_object_data =& $decorator;
$this->handler_method_data = 'TrimData';
}
parent::parse($data);
}

}


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