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<?php
/**
* PHP_ParserGenerator, a php 5 parser generator.
*
* This is a direct port of the Lemon parser generator, found at
* {@link http://www.hwaci.com/sw/lemon/}
*
* PHP version 5
*
* LICENSE:
*
* Copyright (c) 2006, Gregory Beaver <cellog@php.net>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the distribution.
* * Neither the name of the PHP_ParserGenerator nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @category php
* @package PHP_ParserGenerator
* @author Gregory Beaver <cellog@php.net>
* @copyright 2006 Gregory Beaver
* @license http://www.opensource.org/licenses/bsd-license.php New BSD License
* @version CVS: $Id: Action.php,v 1.2 2007/03/04 17:52:05 cellog Exp $
* @since File available since Release 0.1.0
*/
/**
* Every shift or reduce operation is stored as one of the following objects.
*
* @package PHP_ParserGenerator
* @author Gregory Beaver <cellog@php.net>
* @copyright 2006 Gregory Beaver
* @license http://www.opensource.org/licenses/bsd-license.php New BSD License
* @version 0.1.5
* @since Class available since Release 0.1.0
*/
class PHP_ParserGenerator_Action
{
const SHIFT = 1,
ACCEPT = 2,
REDUCE = 3,
ERROR = 4,
/**
* Was a reduce, but part of a conflict
*/
CONFLICT = 5,
/**
* Was a shift. Precedence resolved conflict
*/
SH_RESOLVED = 6,
/**
* Was a reduce. Precedence resolved conflict
*/
RD_RESOLVED = 7,
/**
* Deleted by compression
* @see PHP_ParserGenerator::CompressTables()
*/
NOT_USED = 8;
/**
* The look-ahead symbol that triggers this action
* @var PHP_ParserGenerator_Symbol
*/
public $sp; /* The look-ahead symbol */
/**
* This defines the kind of action, and must be one
* of the class constants.
*
* - {@link PHP_ParserGenerator_Action::SHIFT}
* - {@link PHP_ParserGenerator_Action::ACCEPT}
* - {@link PHP_ParserGenerator_Action::REDUCE}
* - {@link PHP_ParserGenerator_Action::ERROR}
* - {@link PHP_ParserGenerator_Action::CONFLICT}
* - {@link PHP_ParserGenerator_Action::SH_RESOLVED}
* - {@link PHP_ParserGenerator_Action:: RD_RESOLVED}
* - {@link PHP_ParserGenerator_Action::NOT_USED}
*/
public $type;
/**
* The new state, if this is a shift,
* the parser rule index, if this is a reduce.
*
* @var PHP_ParserGenerator_State|PHP_ParserGenerator_Rule
*/
public $x;
/**
* The next action for this state.
* @var PHP_ParserGenerator_Action
*/
public $next;
/**
* Compare two actions
*
* This is used by {@link Action_sort()} to compare actions
*/
public static function actioncmp(PHP_ParserGenerator_Action $ap1,
PHP_ParserGenerator_Action $ap2)
{
$rc = $ap1->sp->index - $ap2->sp->index;
if ($rc === 0) {
$rc = $ap1->type - $ap2->type;
}
if ($rc === 0) {
if ($ap1->type == self::SHIFT) {
if ($ap1->x->statenum != $ap2->x->statenum) {
throw new Exception('Shift conflict: ' . $ap1->sp->name .
' shifts both to state ' . $ap1->x->statenum . ' (rule ' .
$ap1->x->cfp->rp->lhs->name . ' on line ' .
$ap1->x->cfp->rp->ruleline . ') and to state ' .
$ap2->x->statenum . ' (rule ' .
$ap2->x->cfp->rp->lhs->name . ' on line ' .
$ap2->x->cfp->rp->ruleline . ')');
}
}
if ($ap1->type != self::REDUCE &&
$ap1->type != self::RD_RESOLVED &&
$ap1->type != self::CONFLICT) {
throw new Exception('action has not been processed: ' .
$ap1->sp->name . ' on line ' . $ap1->x->cfp->rp->ruleline .
', rule ' . $ap1->x->cfp->rp->lhs->name);
}
if ($ap2->type != self::REDUCE &&
$ap2->type != self::RD_RESOLVED &&
$ap2->type != self::CONFLICT) {
throw new Exception('action has not been processed: ' .
$ap2->sp->name . ' on line ' . $ap2->x->cfp->rp->ruleline .
', rule ' . $ap2->x->cfp->rp->lhs->name);
}
$rc = $ap1->x->index - $ap2->x->index;
}
return $rc;
}
public function display($processed = false)
{
$map = array(
self::ACCEPT => 'ACCEPT',
self::CONFLICT => 'CONFLICT',
self::REDUCE => 'REDUCE',
self::SHIFT => 'SHIFT'
);
$sep = isset($_SERVER['_']) ? "\n" : "<br>";
echo $map[$this->type] . ' for ' . $this->sp->name;
if ($this->type == self::REDUCE) {
echo ' - rule ' . $this->x->lhs->name . $sep;
} elseif ($this->type == self::SHIFT) {
echo ' - state ' . $this->x->statenum . ', basis ' . $this->x->cfp->rp->lhs->name . $sep;
} else {
echo $sep;
}
}
/**
* create linked list of PHP_ParserGenerator_Actions
*
* @param PHP_ParserGenerator_Action|null
* @param int one of the class constants from PHP_ParserGenerator_Action
* @param PHP_ParserGenerator_Symbol
* @param PHP_ParserGenerator_State|PHP_ParserGenerator_Rule
*/
public static function Action_add(&$app, $type, PHP_ParserGenerator_Symbol $sp, $arg)
{
$new = new PHP_ParserGenerator_Action;
$new->next = $app;
$app = $new;
$new->type = $type;
$new->sp = $sp;
$new->x = $arg;
echo ' Adding ';
$new->display();
}
/**
* Sort parser actions
* @see PHP_ParserGenerator_Data::FindActions()
*/
public static function Action_sort(PHP_ParserGenerator_Action $ap)
{
$ap = PHP_ParserGenerator::msort($ap, 'next', array('PHP_ParserGenerator_Action', 'actioncmp'));
return $ap;
}
/**
* Print an action to the given file descriptor. Return FALSE if
* nothing was actually printed.
* @see PHP_ParserGenerator_Data::ReportOutput()
*/
public function PrintAction($fp, $indent)
{
if (!$fp) {
$fp = STDOUT;
}
$result = 1;
switch ($this->type) {
case self::SHIFT:
fprintf($fp, "%${indent}s shift %d", $this->sp->name, $this->x->statenum);
break;
case self::REDUCE:
fprintf($fp, "%${indent}s reduce %d", $this->sp->name, $this->x->index);
break;
case self::ACCEPT:
fprintf($fp, "%${indent}s accept", $this->sp->name);
break;
case self::ERROR:
fprintf($fp, "%${indent}s error", $this->sp->name);
break;
case self::CONFLICT:
fprintf($fp, "%${indent}s reduce %-3d ** Parsing conflict **", $this->sp->name, $this->x->index);
break;
case self::SH_RESOLVED:
case self::RD_RESOLVED:
case self::NOT_USED:
$result = 0;
break;
}
return $result;
}
}
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