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