mirror of
https://github.com/vichan-devel/vichan.git
synced 2024-12-11 15:26:08 +01:00
383 lines
14 KiB
PHP
383 lines
14 KiB
PHP
|
<?php
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This file is part of Twig.
|
||
|
|
*
|
||
|
|
* (c) 2009 Fabien Potencier
|
||
|
|
* (c) 2009 Armin Ronacher
|
||
|
|
*
|
||
|
|
* For the full copyright and license information, please view the LICENSE
|
||
|
|
* file that was distributed with this source code.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Parses expressions.
|
||
|
|
*
|
||
|
|
* This parser implements a "Precedence climbing" algorithm.
|
||
|
|
*
|
||
|
|
* @see http://www.engr.mun.ca/~theo/Misc/exp_parsing.htm
|
||
|
|
* @see http://en.wikipedia.org/wiki/Operator-precedence_parser
|
||
|
|
*
|
||
|
|
* @package twig
|
||
|
|
* @author Fabien Potencier <fabien@symfony.com>
|
||
|
|
*/
|
||
|
|
class Twig_ExpressionParser
|
||
|
|
{
|
||
|
|
const OPERATOR_LEFT = 1;
|
||
|
|
const OPERATOR_RIGHT = 2;
|
||
|
|
|
||
|
|
protected $parser;
|
||
|
|
protected $unaryOperators;
|
||
|
|
protected $binaryOperators;
|
||
|
|
|
||
|
|
public function __construct(Twig_Parser $parser, array $unaryOperators, array $binaryOperators)
|
||
|
|
{
|
||
|
|
$this->parser = $parser;
|
||
|
|
$this->unaryOperators = $unaryOperators;
|
||
|
|
$this->binaryOperators = $binaryOperators;
|
||
|
|
}
|
||
|
|
|
||
|
|
public function parseExpression($precedence = 0)
|
||
|
|
{
|
||
|
|
$expr = $this->getPrimary();
|
||
|
|
$token = $this->parser->getCurrentToken();
|
||
|
|
while ($this->isBinary($token) && $this->binaryOperators[$token->getValue()]['precedence'] >= $precedence) {
|
||
|
|
$op = $this->binaryOperators[$token->getValue()];
|
||
|
|
$this->parser->getStream()->next();
|
||
|
|
|
||
|
|
if (isset($op['callable'])) {
|
||
|
|
$expr = call_user_func($op['callable'], $this->parser, $expr);
|
||
|
|
} else {
|
||
|
|
$expr1 = $this->parseExpression(self::OPERATOR_LEFT === $op['associativity'] ? $op['precedence'] + 1 : $op['precedence']);
|
||
|
|
$class = $op['class'];
|
||
|
|
$expr = new $class($expr, $expr1, $token->getLine());
|
||
|
|
}
|
||
|
|
|
||
|
|
$token = $this->parser->getCurrentToken();
|
||
|
|
}
|
||
|
|
|
||
|
|
if (0 === $precedence) {
|
||
|
|
return $this->parseConditionalExpression($expr);
|
||
|
|
}
|
||
|
|
|
||
|
|
return $expr;
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function getPrimary()
|
||
|
|
{
|
||
|
|
$token = $this->parser->getCurrentToken();
|
||
|
|
|
||
|
|
if ($this->isUnary($token)) {
|
||
|
|
$operator = $this->unaryOperators[$token->getValue()];
|
||
|
|
$this->parser->getStream()->next();
|
||
|
|
$expr = $this->parseExpression($operator['precedence']);
|
||
|
|
$class = $operator['class'];
|
||
|
|
|
||
|
|
return $this->parsePostfixExpression(new $class($expr, $token->getLine()));
|
||
|
|
} elseif ($token->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
|
||
|
|
$this->parser->getStream()->next();
|
||
|
|
$expr = $this->parseExpression();
|
||
|
|
$this->parser->getStream()->expect(Twig_Token::PUNCTUATION_TYPE, ')', 'An opened parenthesis is not properly closed');
|
||
|
|
|
||
|
|
return $this->parsePostfixExpression($expr);
|
||
|
|
}
|
||
|
|
|
||
|
|
return $this->parsePrimaryExpression();
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function parseConditionalExpression($expr)
|
||
|
|
{
|
||
|
|
while ($this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '?')) {
|
||
|
|
$this->parser->getStream()->next();
|
||
|
|
$expr2 = $this->parseExpression();
|
||
|
|
$this->parser->getStream()->expect(Twig_Token::PUNCTUATION_TYPE, ':', 'The ternary operator must have a default value');
|
||
|
|
$expr3 = $this->parseExpression();
|
||
|
|
|
||
|
|
$expr = new Twig_Node_Expression_Conditional($expr, $expr2, $expr3, $this->parser->getCurrentToken()->getLine());
|
||
|
|
}
|
||
|
|
|
||
|
|
return $expr;
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function isUnary(Twig_Token $token)
|
||
|
|
{
|
||
|
|
return $token->test(Twig_Token::OPERATOR_TYPE) && isset($this->unaryOperators[$token->getValue()]);
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function isBinary(Twig_Token $token)
|
||
|
|
{
|
||
|
|
return $token->test(Twig_Token::OPERATOR_TYPE) && isset($this->binaryOperators[$token->getValue()]);
|
||
|
|
}
|
||
|
|
|
||
|
|
public function parsePrimaryExpression()
|
||
|
|
{
|
||
|
|
$token = $this->parser->getCurrentToken();
|
||
|
|
switch ($token->getType()) {
|
||
|
|
case Twig_Token::NAME_TYPE:
|
||
|
|
$this->parser->getStream()->next();
|
||
|
|
switch ($token->getValue()) {
|
||
|
|
case 'true':
|
||
|
|
case 'TRUE':
|
||
|
|
$node = new Twig_Node_Expression_Constant(true, $token->getLine());
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 'false':
|
||
|
|
case 'FALSE':
|
||
|
|
$node = new Twig_Node_Expression_Constant(false, $token->getLine());
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 'none':
|
||
|
|
case 'NONE':
|
||
|
|
case 'null':
|
||
|
|
case 'NULL':
|
||
|
|
$node = new Twig_Node_Expression_Constant(null, $token->getLine());
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
if ('(' === $this->parser->getCurrentToken()->getValue()) {
|
||
|
|
$node = $this->getFunctionNode($token->getValue(), $token->getLine());
|
||
|
|
} else {
|
||
|
|
$node = new Twig_Node_Expression_Name($token->getValue(), $token->getLine());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case Twig_Token::NUMBER_TYPE:
|
||
|
|
case Twig_Token::STRING_TYPE:
|
||
|
|
$this->parser->getStream()->next();
|
||
|
|
$node = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
if ($token->test(Twig_Token::PUNCTUATION_TYPE, '[')) {
|
||
|
|
$node = $this->parseArrayExpression();
|
||
|
|
} elseif ($token->test(Twig_Token::PUNCTUATION_TYPE, '{')) {
|
||
|
|
$node = $this->parseHashExpression();
|
||
|
|
} else {
|
||
|
|
throw new Twig_Error_Syntax(sprintf('Unexpected token "%s" of value "%s"', Twig_Token::typeToEnglish($token->getType(), $token->getLine()), $token->getValue()), $token->getLine());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return $this->parsePostfixExpression($node);
|
||
|
|
}
|
||
|
|
|
||
|
|
public function parseArrayExpression()
|
||
|
|
{
|
||
|
|
$stream = $this->parser->getStream();
|
||
|
|
$stream->expect(Twig_Token::PUNCTUATION_TYPE, '[', 'An array element was expected');
|
||
|
|
$elements = array();
|
||
|
|
while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, ']')) {
|
||
|
|
if (!empty($elements)) {
|
||
|
|
$stream->expect(Twig_Token::PUNCTUATION_TYPE, ',', 'An array element must be followed by a comma');
|
||
|
|
|
||
|
|
// trailing ,?
|
||
|
|
if ($stream->test(Twig_Token::PUNCTUATION_TYPE, ']')) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
$elements[] = $this->parseExpression();
|
||
|
|
}
|
||
|
|
$stream->expect(Twig_Token::PUNCTUATION_TYPE, ']', 'An opened array is not properly closed');
|
||
|
|
|
||
|
|
return new Twig_Node_Expression_Array($elements, $stream->getCurrent()->getLine());
|
||
|
|
}
|
||
|
|
|
||
|
|
public function parseHashExpression()
|
||
|
|
{
|
||
|
|
$stream = $this->parser->getStream();
|
||
|
|
$stream->expect(Twig_Token::PUNCTUATION_TYPE, '{', 'A hash element was expected');
|
||
|
|
$elements = array();
|
||
|
|
while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, '}')) {
|
||
|
|
if (!empty($elements)) {
|
||
|
|
$stream->expect(Twig_Token::PUNCTUATION_TYPE, ',', 'A hash value must be followed by a comma');
|
||
|
|
|
||
|
|
// trailing ,?
|
||
|
|
if ($stream->test(Twig_Token::PUNCTUATION_TYPE, '}')) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!$stream->test(Twig_Token::STRING_TYPE) && !$stream->test(Twig_Token::NUMBER_TYPE)) {
|
||
|
|
$current = $stream->getCurrent();
|
||
|
|
throw new Twig_Error_Syntax(sprintf('A hash key must be a quoted string or a number (unexpected token "%s" of value "%s"', Twig_Token::typeToEnglish($current->getType(), $current->getLine()), $current->getValue()), $current->getLine());
|
||
|
|
}
|
||
|
|
|
||
|
|
$key = $stream->next()->getValue();
|
||
|
|
$stream->expect(Twig_Token::PUNCTUATION_TYPE, ':', 'A hash key must be followed by a colon (:)');
|
||
|
|
$elements[$key] = $this->parseExpression();
|
||
|
|
}
|
||
|
|
$stream->expect(Twig_Token::PUNCTUATION_TYPE, '}', 'An opened hash is not properly closed');
|
||
|
|
|
||
|
|
return new Twig_Node_Expression_Array($elements, $stream->getCurrent()->getLine());
|
||
|
|
}
|
||
|
|
|
||
|
|
public function parsePostfixExpression($node)
|
||
|
|
{
|
||
|
|
while (true) {
|
||
|
|
$token = $this->parser->getCurrentToken();
|
||
|
|
if ($token->getType() == Twig_Token::PUNCTUATION_TYPE) {
|
||
|
|
if ('.' == $token->getValue() || '[' == $token->getValue()) {
|
||
|
|
$node = $this->parseSubscriptExpression($node);
|
||
|
|
} elseif ('|' == $token->getValue()) {
|
||
|
|
$node = $this->parseFilterExpression($node);
|
||
|
|
} else {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return $node;
|
||
|
|
}
|
||
|
|
|
||
|
|
public function getFunctionNode($name, $line)
|
||
|
|
{
|
||
|
|
$args = $this->parseArguments();
|
||
|
|
switch ($name) {
|
||
|
|
case 'parent':
|
||
|
|
if (!count($this->parser->getBlockStack())) {
|
||
|
|
throw new Twig_Error_Syntax('Calling "parent" outside a block is forbidden', $line);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!$this->parser->getParent()) {
|
||
|
|
throw new Twig_Error_Syntax('Calling "parent" on a template that does not extend another one is forbidden', $line);
|
||
|
|
}
|
||
|
|
|
||
|
|
return new Twig_Node_Expression_Parent($this->parser->peekBlockStack(), $line);
|
||
|
|
case 'block':
|
||
|
|
return new Twig_Node_Expression_BlockReference($args->getNode(0), false, $line);
|
||
|
|
case 'attribute':
|
||
|
|
if (count($args) < 2) {
|
||
|
|
throw new Twig_Error_Syntax('The "attribute" function takes at least two arguments (the variable and the attribute)', $line);
|
||
|
|
}
|
||
|
|
|
||
|
|
return new Twig_Node_Expression_GetAttr($args->getNode(0), $args->getNode(1), count($args) > 2 ? $args->getNode(2) : new Twig_Node_Expression_Array(array(), $line), Twig_TemplateInterface::ANY_CALL, $line);
|
||
|
|
default:
|
||
|
|
if (null !== $alias = $this->parser->getImportedFunction($name)) {
|
||
|
|
return new Twig_Node_Expression_GetAttr($alias['node'], new Twig_Node_Expression_Constant($alias['name'], $line), $args, Twig_TemplateInterface::METHOD_CALL, $line);
|
||
|
|
}
|
||
|
|
|
||
|
|
return new Twig_Node_Expression_Function($name, $args, $line);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public function parseSubscriptExpression($node)
|
||
|
|
{
|
||
|
|
$token = $this->parser->getStream()->next();
|
||
|
|
$lineno = $token->getLine();
|
||
|
|
$arguments = new Twig_Node();
|
||
|
|
$type = Twig_TemplateInterface::ANY_CALL;
|
||
|
|
if ($token->getValue() == '.') {
|
||
|
|
$token = $this->parser->getStream()->next();
|
||
|
|
if (
|
||
|
|
$token->getType() == Twig_Token::NAME_TYPE
|
||
|
|
||
|
||
|
|
$token->getType() == Twig_Token::NUMBER_TYPE
|
||
|
|
||
|
||
|
|
($token->getType() == Twig_Token::OPERATOR_TYPE && preg_match(Twig_Lexer::REGEX_NAME, $token->getValue()))
|
||
|
|
) {
|
||
|
|
$arg = new Twig_Node_Expression_Constant($token->getValue(), $lineno);
|
||
|
|
|
||
|
|
if ($this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
|
||
|
|
$type = Twig_TemplateInterface::METHOD_CALL;
|
||
|
|
$arguments = $this->parseArguments();
|
||
|
|
} else {
|
||
|
|
$arguments = new Twig_Node();
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
throw new Twig_Error_Syntax('Expected name or number', $lineno);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
$type = Twig_TemplateInterface::ARRAY_CALL;
|
||
|
|
|
||
|
|
$arg = $this->parseExpression();
|
||
|
|
$this->parser->getStream()->expect(Twig_Token::PUNCTUATION_TYPE, ']');
|
||
|
|
}
|
||
|
|
|
||
|
|
return new Twig_Node_Expression_GetAttr($node, $arg, $arguments, $type, $lineno);
|
||
|
|
}
|
||
|
|
|
||
|
|
public function parseFilterExpression($node)
|
||
|
|
{
|
||
|
|
$this->parser->getStream()->next();
|
||
|
|
|
||
|
|
return $this->parseFilterExpressionRaw($node);
|
||
|
|
}
|
||
|
|
|
||
|
|
public function parseFilterExpressionRaw($node, $tag = null)
|
||
|
|
{
|
||
|
|
while (true) {
|
||
|
|
$token = $this->parser->getStream()->expect(Twig_Token::NAME_TYPE);
|
||
|
|
|
||
|
|
$name = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
|
||
|
|
if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
|
||
|
|
$arguments = new Twig_Node();
|
||
|
|
} else {
|
||
|
|
$arguments = $this->parseArguments();
|
||
|
|
}
|
||
|
|
|
||
|
|
$node = new Twig_Node_Expression_Filter($node, $name, $arguments, $token->getLine(), $tag);
|
||
|
|
|
||
|
|
if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '|')) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
$this->parser->getStream()->next();
|
||
|
|
}
|
||
|
|
|
||
|
|
return $node;
|
||
|
|
}
|
||
|
|
|
||
|
|
public function parseArguments()
|
||
|
|
{
|
||
|
|
$args = array();
|
||
|
|
$stream = $this->parser->getStream();
|
||
|
|
|
||
|
|
$stream->expect(Twig_Token::PUNCTUATION_TYPE, '(', 'A list of arguments must be opened by a parenthesis');
|
||
|
|
while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, ')')) {
|
||
|
|
if (!empty($args)) {
|
||
|
|
$stream->expect(Twig_Token::PUNCTUATION_TYPE, ',', 'Arguments must be separated by a comma');
|
||
|
|
}
|
||
|
|
$args[] = $this->parseExpression();
|
||
|
|
}
|
||
|
|
$stream->expect(Twig_Token::PUNCTUATION_TYPE, ')', 'A list of arguments must be closed by a parenthesis');
|
||
|
|
|
||
|
|
return new Twig_Node($args);
|
||
|
|
}
|
||
|
|
|
||
|
|
public function parseAssignmentExpression()
|
||
|
|
{
|
||
|
|
$targets = array();
|
||
|
|
while (true) {
|
||
|
|
$token = $this->parser->getStream()->expect(Twig_Token::NAME_TYPE, null, 'Only variables can be assigned to');
|
||
|
|
if (in_array($token->getValue(), array('true', 'false', 'none'))) {
|
||
|
|
throw new Twig_Error_Syntax(sprintf('You cannot assign a value to "%s"', $token->getValue()), $token->getLine());
|
||
|
|
}
|
||
|
|
$targets[] = new Twig_Node_Expression_AssignName($token->getValue(), $token->getLine());
|
||
|
|
|
||
|
|
if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, ',')) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
$this->parser->getStream()->next();
|
||
|
|
}
|
||
|
|
|
||
|
|
return new Twig_Node($targets);
|
||
|
|
}
|
||
|
|
|
||
|
|
public function parseMultitargetExpression()
|
||
|
|
{
|
||
|
|
$targets = array();
|
||
|
|
while (true) {
|
||
|
|
$targets[] = $this->parseExpression();
|
||
|
|
if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, ',')) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
$this->parser->getStream()->next();
|
||
|
|
}
|
||
|
|
|
||
|
|
return new Twig_Node($targets);
|
||
|
|
}
|
||
|
|
}
|