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CssToXPath.php
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<?php
/**
* Hoa
*
*
* @license
*
* New BSD License
*
* Copyright © 2007-2017, Hoa community. 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 Hoa 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 HOLDERS AND 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.
*/
namespace Hoa\Xml;
use Hoa\Compiler;
/**
* Class \Hoa\Xml\CssToXPath.
*
* Compiler CSS3 to XPath2.0.
*
* @copyright Copyright © 2007-2017 Hoa community
* @license New BSD License
*/
class CssToXPath extends Compiler\Ll1
{
/**
* XPath root.
*
* @var string
*/
protected $_root = null;
/**
* XPath current path part.
*
* @var string
*/
protected $_current = null;
/**
* Set a default namespace prefix.
*
* @var string
*/
protected $_prefix = null;
/**
* Set up the compiler.
*
*/
public function __construct()
{
// http://w3.org/TR/css3-selectors/#w3cselgrammar
parent::__construct(
// Skip.
[
'#\/\*[^*]*\*+([^/*][^*]*\*+)*\/' // /* … */
],
// Tokens.
[
// 1. Selectors group.
[
'#,\s*' // ,
],
// 2. Selector.
[
'#\s*\+\s*', // +
'#\s*\>\s*', // >
'#\s*~\s*', // ~
'#\s* \s*' // s
],
// 3. Simple selector sequence.
[
'#(\*|\w+)\|', // tu (type selector or universal)
'#\w+', // w
'|', // |
'#\*' // *
],
// 4. Hacpn.
[
'[', // [
']', // ]
'#(\*|\w+)\|(?!=)', // tu (type selector or universal)
'#[\w\-]+\(((\+|\-|\d+\w+|\d+|\'\w+\'|\w+)\s*)+\)', // f
'#[\w\-]+', // w
'#\^=', // ^
'#\$=', // $
'#~=', // ~
'#\*=', // *
'#\|=', // |=
'=', // =
'#\|', // |
'#(\'|").*?(?<!\\\)\2', // 's
'##\w+', // # (hash)
'#\.\w+', // . (class)
':' // :
]
],
// States.
[
// 1. Selectors group.
[
__, // error
'GO' // start
],
// 2. Selector.
[
__, // error
'GO' // start
],
// 3. Simple selector sequence.
[
__, // error
'GO', // start
'TU', // start type selector or universal
'OK' // terminal
],
// 4. Hacpn.
[
__, // error
'GO', // start
'OB', // open bracket: [
'NS', // namespace prefix
'ID', // identifier
'OP', // operator
'VA', // value
'PC', // pseudo-class (:)
'PE', // pseudo-element (::)
'OK' // terminal
]
],
// Terminal.
[
// 1. Selectors group.
['GO'],
// 2. Selector.
['GO'],
// 3. Simple selector sequence.
['GO', 'OK'],
// 4. Hacpn.
['GO', 'OK']
],
// Transitions.
[
// 1. Selectors group.
[
/* ,
/* __ */ [ __ ],
/* GO */ ['GO']
],
// 2. Selector.
[
/* + > ~ s
/* __ */ [ __, __, __, __ ],
/* GO */ ['GO', 'GO', 'GO', 'GO']
],
// 3. Simple selector sequence.
[
/* tu w | *
/* __ */ [ __, __, __, __ ],
/* GO */ ['TU', 'OK', 'TU', 'OK'],
/* TU */ [ __, 'OK', __, 'OK'],
/* OK */ [ __, __, __, __ ]
],
// 4. Hacpn.
[
/* [ ] tu f w ^ $ ~ * |= = | 's # . :
/* __ */ [ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __ ],
/* GO */ ['OB', __, __, __, __, __, __, __, __, __, __, __, __, 'OK', 'OK', 'PC'],
/* OB */ [ __, __, 'NS', __, 'ID', __, __, __, __, __, __, 'NS', __, __, __, __ ],
/* NS */ [ __, __, __, __, 'ID', __, __, __, __, __, __, __, __, __, __, __ ],
/* ID */ [ __, 'OK', __, __, __, 'OP', 'OP', 'OP', 'OP', 'OP', 'OP', __, __, __, __, __ ],
/* OP */ [ __, __, __, __, 'VA', __, __, __, __, __, __, __, 'VA', __, __, __ ],
/* VA */ [ __, 'OK', __, __, __, __, __, __, __, __, __, __, __, __, __, __ ],
/* PC */ [ __, __, __, 'OK', 'OK', __, __, __, __, __, __, __, __, __, __, 'PE'],
/* PE */ [ __, __, __, 'OK', 'OK', __, __, __, __, __, __, __, __, __, __, __ ],
/* OK */ [ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __ ]
]
],
// Actions.
[
// 1. Selectors group.
[
/* ,
/* __ */ [ 0 ],
/* GO */ ['2,,']
],
// 2. Selector.
[
/* + > ~ s
/* __ */ [ 0, 0, 0, 0 ],
/* GO */ ['3,+', '3,>', '3,~', '3, ']
],
// 3. Simple selector sequence.
[
/* tu w | *
/* __ */ [ 0, 0, 0, 0 ],
/* GO */ [ '4,-1', '4,-1', '4,-1', '4,-1'],
/* TU */ [ 0, -1, 0, -1 ],
/* OK */ [ 0, 4, 0, 4 ]
],
// 4. Hacpn.
[
/* [ ] tu f w ^ $ ~ * |= = | 's # . :
/* __ */ [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
/* GO */ [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, '#', '.', 0],
/* OB */ [0, 0, -3, 0, -3, 0, 0, 0, 0, 0, 0, -3, 0, 0, 0, 0],
/* NS */ [0, 0, 0, 0, -3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
/* ID */ [0, ']', 0, 0, 0, '^', '$', '~=', '*', '|', '=', 0, 0, 0, 0, 0],
/* OP */ [0, 0, 0, 0, 'v', 0, 0, 0, 0, 0, 0, 0, 'v', 0, 0, 0],
/* VA */ [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
/* PC */ [0, 0, 0, ':f', ':', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
/* PE */ [0, 0, 0, '::f', '::', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
/* OK */ [0, 4, 0, 4, 4, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4, 0]
]
]
);
}
/**
* Flush xpath current part.
*
* @param string $element Element.
* @param array $selector Selectors collection.
* @param string $pseudo Pseudo-classes and pseudo-elements.
* @return string
*/
protected function flush($element, $selector, $pseudo)
{
$out = $element;
if (!empty($selector)) {
$out .= '[(' . implode(') and (', $selector) . ')]';
}
$out .= $pseudo;
return $out;
}
/**
* Consume actions.
* Please, see the actions table definition to learn more.
*
* @param int $action Action.
* @return void
*/
protected function consume($action)
{
static $__element = '*';
static $_element = '*';
static $element = '*';
static $selector = [];
static $pseudo = null;
static $attribute = null;
static $operator = null;
if (isset($this->buffers[0])) {
if (false !== strpos($this->buffers[0], '|')) {
$__element
= $_element
= $element
= str_replace('|', ':', $this->buffers[0]);
} else {
$__element = $this->buffers[0];
if (null !== $p = $this->getDefaultNamespacePrefix()) {
$_element = $element = $p . ':' . $__element;
} else {
$_element = $element = $__element;
}
}
unset($this->buffers[0]);
}
switch ($action) {
case '__init':
$_element = '*';
$element = '*';
$selector = [];
$pseudo = null;
$attribute = null;
$operator = null;
break;
case '__flush':
$this->_current .= $this->flush($element, $selector, $pseudo);
$element = null;
$selector = [];
$pseudo = null;
break;
case '+':
$this->consume('__flush');
$this->_current .= '/following-sibling::*[1]/self::';
break;
case '>':
$this->consume('__flush');
$this->_current .= '/';
break;
case '~':
$this->consume('__flush');
$this->_current .= '/following-sibling::';
break;
case ' ':
$this->consume('__flush');
$this->_current .= '//';
break;
case '#':
$w = substr($this->buffers[-1], 1);
$selector[] = '@id = "' . $w . '"';
break;
case '.':
$w = substr($this->buffers[-1], 1);
$selector[] =
'contains(concat(' .
'" ", ' .
'normalize-space(@class), ' .
'" "' .
'), " ' . $w . ' ")';
break;
case '=':
case '^':
case '$':
case '~=':
case '*':
case '|':
$attribute = str_replace('|', ':', $this->buffers[1]);
unset($this->buffers[1]);
$operator = $action[0];
break;
case 'v':
$w =
'"' === $this->buffers[-1][0]
? str_replace('\"', '"', substr($this->buffers[-1], 1, -1))
: str_replace('\\\'', '\'', substr($this->buffers[-1], 1, -1));
switch ($operator) {
case '=':
$selector[] = '@' . $attribute . ' = "' . $w . '"';
break;
case '^':
$selector[] = 'starts-with(@' . $attribute . ', "' . $w . '")';
break;
case '$':
$length = strlen($w) - 1;
$selector[] =
'substring(@' . $attribute .
', string-length(@' . $attribute . ') - ' .
$length . ') = "' . $w . '"';
break;
case '~':
$selector[] =
'contains(concat(" ", normalize-space(@' .
$attribute . '), " "), " ' . $w . ' ")';
break;
case '*':
$selector[] = 'contains(@' . $attribute . ', "' . $w . '")';
break;
case '|':
$selector[] =
'@' . $attribute . ' = "' . $w . '" or ' .
'starts-with(@' . $attribute . ', "' . $w .
'-")';
break;
}
$attribute = null;
$operator = null;
break;
case ']':
$w = str_replace('|', ':', $this->buffers[1]);
unset($this->buffers[1]);
$selector[] = '@' . $w;
break;
case ':':
$pc = $this->buffers[-1];
switch ($pc) {
case 'root':
$this->_root = 'self::';
break;
case 'first-child':
if ('*' != $_element) {
$element = '*';
$selector[] = 'name() = "' . $__element . '"';
}
$selector[] = 'position() = 1';
break;
case 'last-child':
if ('*' != $_element) {
$element = '*';
$selector[] = 'name() = "' . $__element . '"';
}
$selector[] = 'position() = last()';
break;
case 'first-of-type':
if ('*' == $_element) {
throw new Compiler\Exception(
'Cannot have a :first-of-type without element.',
0
);
}
$selector[] = 'position() = 1';
break;
case 'last-of-type':
if ('*' == $_element) {
throw new Compiler\Exception(
'Cannot have a :last-of-type without element.',
1
);
}
$selector[] = 'position() = last()';
break;
case 'only-child':
if ('*' != $_element) {
$element = '*';
$selector[] = 'name() = "' . $_element . '"';
}
$selector[] = 'last() = 1';
break;
case 'only-of-type':
if ('*' == $_element) {
throw new Compiler\Exception(
'Cannot have a :only-of-type without element.',
2
);
}
$selector[] = 'last() = 1';
break;
case 'empty':
$selector[] = 'not(*)';
$selector[] = 'not(normalize-space())';
break;
default:
$selector[] = $this->callPseudoClass($element, $pc);
}
break;
case '::':
$pe = $this->buffers[-1];
$selector[] = $this->callPseudoElement($element, $pe);
break;
case ':f':
$first = strpos($this->buffers[-1], '(');
$pcf = substr($this->buffers[-1], 0, $first);
$args = substr($this->buffers[-1], $first + 1, -1);
switch ($pcf) {
case 'nth-child':
case 'nth-of-type':
preg_match(
'#^(?:([+|-])?\s*(\d+)?\s*(n))?\s*([+|-]?\s*\d+)?$#',
$args,
$matches
);
$group =
!empty($matches[3])
? '' !== $matches[2]
? @$matches[1] . str_replace(' ', '', $matches[2])
: @$matches[1] . '1'
: '0';
$offset =
isset($matches[4]) && null !== $matches[4]
? str_replace(' ', '', $matches[4])
: '0';
if (0 <= (int) $offset) {
$offset = '+' . trim($offset, '+');
}
$tesffo =
'+' == $offset[0]
? '- ' . substr($offset, 1)
: '+ ' . substr($offset, 1);
if ('nth-child' == $pcf && '*' != $_element) {
$element = '*';
$selector[] = 'name() = "' . $_element . '"';
} elseif ('nth-of-type' == $pcf && '*' == $_element) {
throw new Compiler\Exception(
'Cannot have a :nth-of-type without element.',
3
);
}
if (0 != (int) $group) {
if ('1' != $group) {
$selector[] = 'position() ' . $tesffo . ') mod ' .
$group . ' = 0';
}
$selector[] = 'position() >= ' . (int) $offset;
} else {
$selector[] = 'position() = ' . (int) $offset;
}
break;
case 'nth-last-child':
case 'nth-last-of-type':
preg_match(
'#^(?:([+|-])?\s*(\d+)?\s*(n))?\s*([+|-]?\s*\d+)?$#',
$args,
$matches
);
$group =
!empty($matches[3])
? '' !== $matches[2]
? @$matches[1] . str_replace(' ', '', $matches[2])
: @$matches[1] . '1'
: '0';
$offset =
isset($matches[4]) && null !== $matches[4]
? str_replace(' ', '', $matches[4])
: '0';
if (0 <= (int) $group) {
$group = '+' . trim($group, '+');
}
if (0 <= (int) $offset) {
$offset = '+' . trim($offset, '+');
}
$puorg =
'+' == $group[0]
? '-' . substr($group, 1)
: '+' . substr($group, 1);
$tesffo =
'+' == $offset[0]
? '- ' . substr($offset, 1)
: '+ ' . substr($offset, 1);
if ('nth-last-child' === $pcf && '*' !== $_element) {
$element = '*';
$selector[] = 'name() = "' . $_element . '"';
} elseif ('nth-last-of-type' === $pcf && '*' === $_element) {
throw new Compiler\Exception(
'Cannot have a :nth-last-of-type without element.',
4
);
}
if (0 !== (int) $group) {
if ('1' !== $group) {
$selector[] =
'position() ' . $offset . ') mod ' .
$puorg . ' = 0';
}
$selector[] = 'position() <= (last() - ' . (int) $offset . ')';
} else {
$selector[] = 'position() = (last() - ' . (int) $offset . ')';
}
break;
default:
$selector[] = $this->callPseudoClassFunction($element, $pcf);
}
break;
case '::f':
$pef = $this->buffers[-1];
$this->_current .= $this->callPseudoElementFunction($element, $pef);
break;
}
}
/**
* Compute source code before compiling it.
*
* @param string &$in Source code.
* @return void
*/
protected function pre(&$in)
{
$this->_root = 'descendant-or-self::';
$this->_current = null;
$this->consume('__init');
return;
}
/**
* Verify compiler state when ending the source code.
*
* @return bool
*/
protected function end()
{
$this->consume('__flush');
$this->_current = $this->_root . $this->_current;
return true;
}
/**
* Get the result of the compiling.
*
* @return string
*/
public function getResult()
{
return $this->getXPath();
}
/**
* Get result.
*
* @return string
*/
public function getXPath()
{
return $this->_current;
}
/**
* Call this method when a pseudo-class is unknown.
*
* @param string $element Element.
* @param string $pseudoClass Pseudo-class.
* @return string
*/
protected function callPseudoClass($element, $pseudoClass)
{
throw new Compiler\Exception(
'The pseudo-class %s on the element %s is unknown.',
5,
[$pseudoClass, $element]
);
}
/**
* Call this method when a pseudo-element is unknown.
*
* @param string $element Element.
* @param string $pseudoElement Pseudo-element.
* @return string
*/
protected function callPseudoElement($element, $pseudoElement)
{
throw new Compiler\Exception(
'The pseudo-element %s on the element %s is unknown.',
6,
[$pseudoElement, $element]
);
}
/**
* Call this method when a pseudo-class function is unknown.
*
* @param string $element Element.
* @param string $function Pseudo-class function.
* @return string
*/
protected function callPseudoClassFunction($element, $function)
{
throw new Compiler\Exception(
'The pseudo-class function %s on the element %s is unknown.',
7,
[$function, $element]
);
}
/**
* Call this method when a pseudo-element funcion is unknown.
*
* @param string $element Element.
* @param string $function Pseudo-element function.
* @return string
*/
protected function callPseudoElementFunction($element, $function)
{
throw new Compiler\Exception(
'The pseudo-element function %s on the element %s is unknown.',
8,
[$function, $element]
);
}
/**
* Set the default namespace prefix (e.g. __current_ns).
*
* @param string $prefix Default prefix.
* @return string
*/
public function setDefaultNamespacePrefix($prefix)
{
$old = $this->_prefix;
$this->_prefix = $prefix;
return $old;
}
/**
* Get the default namespace prefix.
*
* @return string
*/
public function getDefaultNamespacePrefix()
{
return $this->_prefix;
}
}