340 lines
14 KiB
PHP
340 lines
14 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Routing;
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/**
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* RouteCompiler compiles Route instances to CompiledRoute instances.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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* @author Tobias Schultze <http://tobion.de>
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*/
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class RouteCompiler implements RouteCompilerInterface
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{
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/**
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* This string defines the characters that are automatically considered separators in front of
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* optional placeholders (with default and no static text following). Such a single separator
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* can be left out together with the optional placeholder from matching and generating URLs.
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*/
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public const SEPARATORS = '/,;.:-_~+*=@|';
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/**
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* The maximum supported length of a PCRE subpattern name
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* http://pcre.org/current/doc/html/pcre2pattern.html#SEC16.
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*
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* @internal
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*/
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public const VARIABLE_MAXIMUM_LENGTH = 32;
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/**
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* @throws \InvalidArgumentException if a path variable is named _fragment
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* @throws \LogicException if a variable is referenced more than once
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* @throws \DomainException if a variable name starts with a digit or if it is too long to be successfully used as
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* a PCRE subpattern
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*/
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public static function compile(Route $route): CompiledRoute
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{
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$hostVariables = [];
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$variables = [];
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$hostRegex = null;
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$hostTokens = [];
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if ('' !== $host = $route->getHost()) {
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$result = self::compilePattern($route, $host, true);
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$hostVariables = $result['variables'];
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$variables = $hostVariables;
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$hostTokens = $result['tokens'];
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$hostRegex = $result['regex'];
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}
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$locale = $route->getDefault('_locale');
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if (null !== $locale && null !== $route->getDefault('_canonical_route') && preg_quote($locale) === $route->getRequirement('_locale')) {
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$requirements = $route->getRequirements();
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unset($requirements['_locale']);
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$route->setRequirements($requirements);
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$route->setPath(str_replace('{_locale}', $locale, $route->getPath()));
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}
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$path = $route->getPath();
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$result = self::compilePattern($route, $path, false);
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$staticPrefix = $result['staticPrefix'];
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$pathVariables = $result['variables'];
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foreach ($pathVariables as $pathParam) {
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if ('_fragment' === $pathParam) {
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throw new \InvalidArgumentException(sprintf('Route pattern "%s" cannot contain "_fragment" as a path parameter.', $route->getPath()));
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}
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}
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$variables = array_merge($variables, $pathVariables);
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$tokens = $result['tokens'];
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$regex = $result['regex'];
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return new CompiledRoute(
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$staticPrefix,
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$regex,
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$tokens,
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$pathVariables,
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$hostRegex,
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$hostTokens,
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$hostVariables,
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array_unique($variables)
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);
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}
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private static function compilePattern(Route $route, string $pattern, bool $isHost): array
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{
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$tokens = [];
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$variables = [];
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$matches = [];
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$pos = 0;
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$defaultSeparator = $isHost ? '.' : '/';
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$useUtf8 = preg_match('//u', $pattern);
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$needsUtf8 = $route->getOption('utf8');
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if (!$needsUtf8 && $useUtf8 && preg_match('/[\x80-\xFF]/', $pattern)) {
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throw new \LogicException(sprintf('Cannot use UTF-8 route patterns without setting the "utf8" option for route "%s".', $route->getPath()));
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}
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if (!$useUtf8 && $needsUtf8) {
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throw new \LogicException(sprintf('Cannot mix UTF-8 requirements with non-UTF-8 pattern "%s".', $pattern));
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}
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// Match all variables enclosed in "{}" and iterate over them. But we only want to match the innermost variable
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// in case of nested "{}", e.g. {foo{bar}}. This in ensured because \w does not match "{" or "}" itself.
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preg_match_all('#\{(!)?([\w\x80-\xFF]+)\}#', $pattern, $matches, \PREG_OFFSET_CAPTURE | \PREG_SET_ORDER);
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foreach ($matches as $match) {
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$important = $match[1][1] >= 0;
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$varName = $match[2][0];
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// get all static text preceding the current variable
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$precedingText = substr($pattern, $pos, $match[0][1] - $pos);
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$pos = $match[0][1] + \strlen($match[0][0]);
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if (!\strlen($precedingText)) {
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$precedingChar = '';
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} elseif ($useUtf8) {
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preg_match('/.$/u', $precedingText, $precedingChar);
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$precedingChar = $precedingChar[0];
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} else {
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$precedingChar = substr($precedingText, -1);
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}
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$isSeparator = '' !== $precedingChar && str_contains(static::SEPARATORS, $precedingChar);
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// A PCRE subpattern name must start with a non-digit. Also a PHP variable cannot start with a digit so the
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// variable would not be usable as a Controller action argument.
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if (preg_match('/^\d/', $varName)) {
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throw new \DomainException(sprintf('Variable name "%s" cannot start with a digit in route pattern "%s". Please use a different name.', $varName, $pattern));
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}
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if (\in_array($varName, $variables)) {
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throw new \LogicException(sprintf('Route pattern "%s" cannot reference variable name "%s" more than once.', $pattern, $varName));
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}
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if (\strlen($varName) > self::VARIABLE_MAXIMUM_LENGTH) {
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throw new \DomainException(sprintf('Variable name "%s" cannot be longer than %d characters in route pattern "%s". Please use a shorter name.', $varName, self::VARIABLE_MAXIMUM_LENGTH, $pattern));
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}
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if ($isSeparator && $precedingText !== $precedingChar) {
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$tokens[] = ['text', substr($precedingText, 0, -\strlen($precedingChar))];
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} elseif (!$isSeparator && '' !== $precedingText) {
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$tokens[] = ['text', $precedingText];
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}
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$regexp = $route->getRequirement($varName);
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if (null === $regexp) {
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$followingPattern = (string) substr($pattern, $pos);
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// Find the next static character after the variable that functions as a separator. By default, this separator and '/'
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// are disallowed for the variable. This default requirement makes sure that optional variables can be matched at all
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// and that the generating-matching-combination of URLs unambiguous, i.e. the params used for generating the URL are
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// the same that will be matched. Example: new Route('/{page}.{_format}', ['_format' => 'html'])
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// If {page} would also match the separating dot, {_format} would never match as {page} will eagerly consume everything.
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// Also even if {_format} was not optional the requirement prevents that {page} matches something that was originally
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// part of {_format} when generating the URL, e.g. _format = 'mobile.html'.
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$nextSeparator = self::findNextSeparator($followingPattern, $useUtf8);
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$regexp = sprintf(
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'[^%s%s]+',
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preg_quote($defaultSeparator),
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$defaultSeparator !== $nextSeparator && '' !== $nextSeparator ? preg_quote($nextSeparator) : ''
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);
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if (('' !== $nextSeparator && !preg_match('#^\{[\w\x80-\xFF]+\}#', $followingPattern)) || '' === $followingPattern) {
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// When we have a separator, which is disallowed for the variable, we can optimize the regex with a possessive
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// quantifier. This prevents useless backtracking of PCRE and improves performance by 20% for matching those patterns.
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// Given the above example, there is no point in backtracking into {page} (that forbids the dot) when a dot must follow
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// after it. This optimization cannot be applied when the next char is no real separator or when the next variable is
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// directly adjacent, e.g. '/{x}{y}'.
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$regexp .= '+';
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}
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} else {
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if (!preg_match('//u', $regexp)) {
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$useUtf8 = false;
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} elseif (!$needsUtf8 && preg_match('/[\x80-\xFF]|(?<!\\\\)\\\\(?:\\\\\\\\)*+(?-i:X|[pP][\{CLMNPSZ]|x\{[A-Fa-f0-9]{3})/', $regexp)) {
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throw new \LogicException(sprintf('Cannot use UTF-8 route requirements without setting the "utf8" option for variable "%s" in pattern "%s".', $varName, $pattern));
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}
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if (!$useUtf8 && $needsUtf8) {
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throw new \LogicException(sprintf('Cannot mix UTF-8 requirement with non-UTF-8 charset for variable "%s" in pattern "%s".', $varName, $pattern));
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}
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$regexp = self::transformCapturingGroupsToNonCapturings($regexp);
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}
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if ($important) {
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$token = ['variable', $isSeparator ? $precedingChar : '', $regexp, $varName, false, true];
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} else {
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$token = ['variable', $isSeparator ? $precedingChar : '', $regexp, $varName];
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}
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$tokens[] = $token;
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$variables[] = $varName;
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}
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if ($pos < \strlen($pattern)) {
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$tokens[] = ['text', substr($pattern, $pos)];
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}
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// find the first optional token
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$firstOptional = \PHP_INT_MAX;
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if (!$isHost) {
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for ($i = \count($tokens) - 1; $i >= 0; --$i) {
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$token = $tokens[$i];
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// variable is optional when it is not important and has a default value
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if ('variable' === $token[0] && !($token[5] ?? false) && $route->hasDefault($token[3])) {
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$firstOptional = $i;
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} else {
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break;
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}
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}
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}
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// compute the matching regexp
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$regexp = '';
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for ($i = 0, $nbToken = \count($tokens); $i < $nbToken; ++$i) {
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$regexp .= self::computeRegexp($tokens, $i, $firstOptional);
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}
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$regexp = '{^'.$regexp.'$}sD'.($isHost ? 'i' : '');
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// enable Utf8 matching if really required
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if ($needsUtf8) {
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$regexp .= 'u';
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for ($i = 0, $nbToken = \count($tokens); $i < $nbToken; ++$i) {
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if ('variable' === $tokens[$i][0]) {
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$tokens[$i][4] = true;
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}
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}
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}
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return [
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'staticPrefix' => self::determineStaticPrefix($route, $tokens),
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'regex' => $regexp,
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'tokens' => array_reverse($tokens),
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'variables' => $variables,
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];
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}
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/**
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* Determines the longest static prefix possible for a route.
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*/
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private static function determineStaticPrefix(Route $route, array $tokens): string
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{
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if ('text' !== $tokens[0][0]) {
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return ($route->hasDefault($tokens[0][3]) || '/' === $tokens[0][1]) ? '' : $tokens[0][1];
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}
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$prefix = $tokens[0][1];
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if (isset($tokens[1][1]) && '/' !== $tokens[1][1] && false === $route->hasDefault($tokens[1][3])) {
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$prefix .= $tokens[1][1];
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}
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return $prefix;
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}
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/**
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* Returns the next static character in the Route pattern that will serve as a separator (or the empty string when none available).
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*/
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private static function findNextSeparator(string $pattern, bool $useUtf8): string
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{
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if ('' == $pattern) {
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// return empty string if pattern is empty or false (false which can be returned by substr)
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return '';
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}
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// first remove all placeholders from the pattern so we can find the next real static character
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if ('' === $pattern = preg_replace('#\{[\w\x80-\xFF]+\}#', '', $pattern)) {
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return '';
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}
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if ($useUtf8) {
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preg_match('/^./u', $pattern, $pattern);
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}
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return str_contains(static::SEPARATORS, $pattern[0]) ? $pattern[0] : '';
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}
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/**
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* Computes the regexp used to match a specific token. It can be static text or a subpattern.
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*
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* @param array $tokens The route tokens
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* @param int $index The index of the current token
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* @param int $firstOptional The index of the first optional token
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*/
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private static function computeRegexp(array $tokens, int $index, int $firstOptional): string
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{
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$token = $tokens[$index];
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if ('text' === $token[0]) {
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// Text tokens
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return preg_quote($token[1]);
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} else {
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// Variable tokens
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if (0 === $index && 0 === $firstOptional) {
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// When the only token is an optional variable token, the separator is required
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return sprintf('%s(?P<%s>%s)?', preg_quote($token[1]), $token[3], $token[2]);
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} else {
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$regexp = sprintf('%s(?P<%s>%s)', preg_quote($token[1]), $token[3], $token[2]);
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if ($index >= $firstOptional) {
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// Enclose each optional token in a subpattern to make it optional.
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// "?:" means it is non-capturing, i.e. the portion of the subject string that
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// matched the optional subpattern is not passed back.
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$regexp = "(?:$regexp";
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$nbTokens = \count($tokens);
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if ($nbTokens - 1 == $index) {
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// Close the optional subpatterns
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$regexp .= str_repeat(')?', $nbTokens - $firstOptional - (0 === $firstOptional ? 1 : 0));
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}
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}
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return $regexp;
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}
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}
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}
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private static function transformCapturingGroupsToNonCapturings(string $regexp): string
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{
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for ($i = 0; $i < \strlen($regexp); ++$i) {
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if ('\\' === $regexp[$i]) {
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++$i;
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continue;
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}
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if ('(' !== $regexp[$i] || !isset($regexp[$i + 2])) {
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continue;
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}
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if ('*' === $regexp[++$i] || '?' === $regexp[$i]) {
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++$i;
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continue;
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}
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$regexp = substr_replace($regexp, '?:', $i, 0);
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++$i;
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}
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return $regexp;
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}
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}
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