Current Path : C:/xampp/htdocs/moodle/lib/mustache/src/Mustache/ |
Current File : C:/xampp/htdocs/moodle/lib/mustache/src/Mustache/Parser.php |
<?php /* * This file is part of Mustache.php. * * (c) 2010-2017 Justin Hileman * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ /** * Mustache Parser class. * * This class is responsible for turning a set of Mustache tokens into a parse tree. */ class Mustache_Parser { private $lineNum; private $lineTokens; private $pragmas; private $defaultPragmas = array(); private $pragmaFilters; private $pragmaBlocks; /** * Process an array of Mustache tokens and convert them into a parse tree. * * @param array $tokens Set of Mustache tokens * * @return array Mustache token parse tree */ public function parse(array $tokens = array()) { $this->lineNum = -1; $this->lineTokens = 0; $this->pragmas = $this->defaultPragmas; $this->pragmaFilters = isset($this->pragmas[Mustache_Engine::PRAGMA_FILTERS]); $this->pragmaBlocks = isset($this->pragmas[Mustache_Engine::PRAGMA_BLOCKS]); return $this->buildTree($tokens); } /** * Enable pragmas across all templates, regardless of the presence of pragma * tags in the individual templates. * * @internal Users should set global pragmas in Mustache_Engine, not here :) * * @param string[] $pragmas */ public function setPragmas(array $pragmas) { $this->pragmas = array(); foreach ($pragmas as $pragma) { $this->enablePragma($pragma); } $this->defaultPragmas = $this->pragmas; } /** * Helper method for recursively building a parse tree. * * @throws Mustache_Exception_SyntaxException when nesting errors or mismatched section tags are encountered * * @param array &$tokens Set of Mustache tokens * @param array $parent Parent token (default: null) * * @return array Mustache Token parse tree */ private function buildTree(array &$tokens, array $parent = null) { $nodes = array(); while (!empty($tokens)) { $token = array_shift($tokens); if ($token[Mustache_Tokenizer::LINE] === $this->lineNum) { $this->lineTokens++; } else { $this->lineNum = $token[Mustache_Tokenizer::LINE]; $this->lineTokens = 0; } if ($this->pragmaFilters && isset($token[Mustache_Tokenizer::NAME])) { list($name, $filters) = $this->getNameAndFilters($token[Mustache_Tokenizer::NAME]); if (!empty($filters)) { $token[Mustache_Tokenizer::NAME] = $name; $token[Mustache_Tokenizer::FILTERS] = $filters; } } switch ($token[Mustache_Tokenizer::TYPE]) { case Mustache_Tokenizer::T_DELIM_CHANGE: $this->checkIfTokenIsAllowedInParent($parent, $token); $this->clearStandaloneLines($nodes, $tokens); break; case Mustache_Tokenizer::T_SECTION: case Mustache_Tokenizer::T_INVERTED: $this->checkIfTokenIsAllowedInParent($parent, $token); $this->clearStandaloneLines($nodes, $tokens); $nodes[] = $this->buildTree($tokens, $token); break; case Mustache_Tokenizer::T_END_SECTION: if (!isset($parent)) { $msg = sprintf( 'Unexpected closing tag: /%s on line %d', $token[Mustache_Tokenizer::NAME], $token[Mustache_Tokenizer::LINE] ); throw new Mustache_Exception_SyntaxException($msg, $token); } if ($token[Mustache_Tokenizer::NAME] !== $parent[Mustache_Tokenizer::NAME]) { $msg = sprintf( 'Nesting error: %s (on line %d) vs. %s (on line %d)', $parent[Mustache_Tokenizer::NAME], $parent[Mustache_Tokenizer::LINE], $token[Mustache_Tokenizer::NAME], $token[Mustache_Tokenizer::LINE] ); throw new Mustache_Exception_SyntaxException($msg, $token); } $this->clearStandaloneLines($nodes, $tokens); $parent[Mustache_Tokenizer::END] = $token[Mustache_Tokenizer::INDEX]; $parent[Mustache_Tokenizer::NODES] = $nodes; return $parent; case Mustache_Tokenizer::T_PARTIAL: $this->checkIfTokenIsAllowedInParent($parent, $token); //store the whitespace prefix for laters! if ($indent = $this->clearStandaloneLines($nodes, $tokens)) { $token[Mustache_Tokenizer::INDENT] = $indent[Mustache_Tokenizer::VALUE]; } $nodes[] = $token; break; case Mustache_Tokenizer::T_PARENT: $this->checkIfTokenIsAllowedInParent($parent, $token); $nodes[] = $this->buildTree($tokens, $token); break; case Mustache_Tokenizer::T_BLOCK_VAR: if ($this->pragmaBlocks) { // BLOCKS pragma is enabled, let's do this! if (isset($parent) && $parent[Mustache_Tokenizer::TYPE] === Mustache_Tokenizer::T_PARENT) { $token[Mustache_Tokenizer::TYPE] = Mustache_Tokenizer::T_BLOCK_ARG; } $this->clearStandaloneLines($nodes, $tokens); $nodes[] = $this->buildTree($tokens, $token); } else { // pretend this was just a normal "escaped" token... $token[Mustache_Tokenizer::TYPE] = Mustache_Tokenizer::T_ESCAPED; // TODO: figure out how to figure out if there was a space after this dollar: $token[Mustache_Tokenizer::NAME] = '$' . $token[Mustache_Tokenizer::NAME]; $nodes[] = $token; } break; case Mustache_Tokenizer::T_PRAGMA: $this->enablePragma($token[Mustache_Tokenizer::NAME]); // no break case Mustache_Tokenizer::T_COMMENT: $this->clearStandaloneLines($nodes, $tokens); $nodes[] = $token; break; default: $nodes[] = $token; break; } } if (isset($parent)) { $msg = sprintf( 'Missing closing tag: %s opened on line %d', $parent[Mustache_Tokenizer::NAME], $parent[Mustache_Tokenizer::LINE] ); throw new Mustache_Exception_SyntaxException($msg, $parent); } return $nodes; } /** * Clear standalone line tokens. * * Returns a whitespace token for indenting partials, if applicable. * * @param array $nodes Parsed nodes * @param array $tokens Tokens to be parsed * * @return array|null Resulting indent token, if any */ private function clearStandaloneLines(array &$nodes, array &$tokens) { if ($this->lineTokens > 1) { // this is the third or later node on this line, so it can't be standalone return; } $prev = null; if ($this->lineTokens === 1) { // this is the second node on this line, so it can't be standalone // unless the previous node is whitespace. if ($prev = end($nodes)) { if (!$this->tokenIsWhitespace($prev)) { return; } } } if ($next = reset($tokens)) { // If we're on a new line, bail. if ($next[Mustache_Tokenizer::LINE] !== $this->lineNum) { return; } // If the next token isn't whitespace, bail. if (!$this->tokenIsWhitespace($next)) { return; } if (count($tokens) !== 1) { // Unless it's the last token in the template, the next token // must end in newline for this to be standalone. if (substr($next[Mustache_Tokenizer::VALUE], -1) !== "\n") { return; } } // Discard the whitespace suffix array_shift($tokens); } if ($prev) { // Return the whitespace prefix, if any return array_pop($nodes); } } /** * Check whether token is a whitespace token. * * True if token type is T_TEXT and value is all whitespace characters. * * @param array $token * * @return bool True if token is a whitespace token */ private function tokenIsWhitespace(array $token) { if ($token[Mustache_Tokenizer::TYPE] === Mustache_Tokenizer::T_TEXT) { return preg_match('/^\s*$/', $token[Mustache_Tokenizer::VALUE]); } return false; } /** * Check whether a token is allowed inside a parent tag. * * @throws Mustache_Exception_SyntaxException if an invalid token is found inside a parent tag * * @param array|null $parent * @param array $token */ private function checkIfTokenIsAllowedInParent($parent, array $token) { if (isset($parent) && $parent[Mustache_Tokenizer::TYPE] === Mustache_Tokenizer::T_PARENT) { throw new Mustache_Exception_SyntaxException('Illegal content in < parent tag', $token); } } /** * Split a tag name into name and filters. * * @param string $name * * @return array [Tag name, Array of filters] */ private function getNameAndFilters($name) { $filters = array_map('trim', explode('|', $name)); $name = array_shift($filters); return array($name, $filters); } /** * Enable a pragma. * * @param string $name */ private function enablePragma($name) { $this->pragmas[$name] = true; switch ($name) { case Mustache_Engine::PRAGMA_BLOCKS: $this->pragmaBlocks = true; break; case Mustache_Engine::PRAGMA_FILTERS: $this->pragmaFilters = true; break; } } }