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Refactor lexer instantiation logic with exceptions and forced line tracking.

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Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
This commit is contained in:
Edward Z. Yang
2008-09-05 14:04:23 -04:00
parent 92df9e5b28
commit ed7983b559
4 changed files with 79 additions and 34 deletions
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87
library/HTMLPurifier/Lexer.php
View File

@ -42,6 +42,12 @@
class HTMLPurifier_Lexer
{
/**
* Whether or not this lexer implements line-number/column-number tracking.
* If it does, set to true.
*/
public $tracksLineNumbers = false;
// -- STATIC ----------------------------------------------------------
/**
@ -70,46 +76,59 @@ class HTMLPurifier_Lexer
$lexer = $config->get('Core', 'LexerImpl');
}
$needs_tracking =
$config->get('Core', 'MaintainLineNumbers') ||
$config->get('Core', 'CollectErrors');
$inst = null;
if (is_object($lexer)) {
return $lexer;
$inst = $lexer;
} else {
if (is_null($lexer)) { do {
// auto-detection algorithm
if ($needs_tracking) {
$lexer = 'DirectLex';
break;
}
if (class_exists('DOMDocument') && method_exists('DOMDocument', 'loadHTML')) {
// check for DOM support, because, surprisingly enough,
// it's *not* part of the core!
$lexer = 'DOMLex';
} else {
$lexer = 'DirectLex';
}
} while(0); } // do..while so we can break
// instantiate recognized string names
switch ($lexer) {
case 'DOMLex':
$inst = new HTMLPurifier_Lexer_DOMLex();
break;
case 'DirectLex':
$inst = new HTMLPurifier_Lexer_DirectLex();
break;
case 'PH5P':
$inst = new HTMLPurifier_Lexer_PH5P();
break;
default:
throw new HTMLPurifier_Exception("Cannot instantiate unrecognized Lexer type " . htmlspecialchars($lexer));
}
}
if (is_null($lexer)) { do {
// auto-detection algorithm
// once PHP DOM implements native line numbers, or we
// hack out something using XSLT, remove this stipulation
$line_numbers = $config->get('Core', 'MaintainLineNumbers');
if (
$line_numbers === true ||
($line_numbers === null && $config->get('Core', 'CollectErrors'))
) {
$lexer = 'DirectLex';
break;
}
if (class_exists('DOMDocument') && method_exists('DOMDocument', 'loadHTML')) {
// check for DOM support, because, surprisingly enough,
// it's *not* part of the core!
$lexer = 'DOMLex';
} else {
$lexer = 'DirectLex';
}
} while(0); } // do..while so we can break
if (!$inst) throw new HTMLPurifier_Exception('No lexer was instantiated');
// instantiate recognized string names
switch ($lexer) {
case 'DOMLex':
return new HTMLPurifier_Lexer_DOMLex();
case 'DirectLex':
return new HTMLPurifier_Lexer_DirectLex();
case 'PH5P':
return new HTMLPurifier_Lexer_PH5P();
default:
trigger_error("Cannot instantiate unrecognized Lexer type " . htmlspecialchars($lexer), E_USER_ERROR);
// once PHP DOM implements native line numbers, or we
// hack out something using XSLT, remove this stipulation
if ($needs_tracking && !$inst->tracksLineNumbers) {
throw new HTMLPurifier_Exception('Cannot use lexer that does not support line numbers with Core.MaintainLineNumbers or Core.CollectErrors (use DirectLex instead)');
}
return $inst;
}
// -- CONVENIENCE MEMBERS ---------------------------------------------

2
library/HTMLPurifier/Lexer/DirectLex.php
View File

@ -13,6 +13,8 @@
class HTMLPurifier_Lexer_DirectLex extends HTMLPurifier_Lexer
{
public $tracksLineNumbers = true;
/**
* Whitespace characters for str(c)spn.
*/