profile-builder / assets / lib / Mustache / Parser.php

Parser.php in User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor 2.7.1, at assets/lib/Mustache/Parser.php

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1	<?php
2
3	/*
4	* This file is part of Mustache.php.
5	*
6	* (c) 2012 Justin Hileman
7	*
8	* For the full copyright and license information, please view the LICENSE
9	* file that was distributed with this source code.
10	*/
11
12	/**
13	* Mustache Parser class.
14	*
15	* This class is responsible for turning a set of Mustache tokens into a parse tree.
16	*/
17	class Mustache_Parser
18	{
19	private $lineNum;
20	private $lineTokens;
21
22	/**
23	* Process an array of Mustache tokens and convert them into a parse tree.
24	*
25	* @param array $tokens Set of Mustache tokens
26	*
27	* @return array Mustache token parse tree
28	*/
29	public function parse(array $tokens = array())
30	{
31	$this->lineNum = -1;
32	$this->lineTokens = 0;
33
34	return $this->buildTree($tokens);
35	}
36
37	/**
38	* Helper method for recursively building a parse tree.
39	*
40	* @throws Mustache_Exception_SyntaxException when nesting errors or mismatched section tags are encountered.
41	*
42	* @param array &$tokens Set of Mustache tokens
43	* @param array $parent Parent token (default: null)
44	*
45	* @return array Mustache Token parse tree
46	*/
47	private function buildTree(array &$tokens, array $parent = null)
48	{
49	$nodes = array();
50
51	while (!empty($tokens)) {
52	$token = array_shift($tokens);
53
54	if ($token[Mustache_Tokenizer::LINE] === $this->lineNum) {
55	$this->lineTokens++;
56	} else {
57	$this->lineNum = $token[Mustache_Tokenizer::LINE];
58	$this->lineTokens = 0;
59	}
60
61	switch ($token[Mustache_Tokenizer::TYPE]) {
62	case Mustache_Tokenizer::T_DELIM_CHANGE:
63	$this->clearStandaloneLines($nodes, $tokens);
64	break;
65
66	case Mustache_Tokenizer::T_SECTION:
67	case Mustache_Tokenizer::T_INVERTED:
68	$this->clearStandaloneLines($nodes, $tokens);
69	$nodes[] = $this->buildTree($tokens, $token);
70	break;
71
72	case Mustache_Tokenizer::T_END_SECTION:
73	if (!isset($parent)) {
74	$msg = sprintf('Unexpected closing tag: /%s', $token[Mustache_Tokenizer::NAME]);
75	throw new Mustache_Exception_SyntaxException($msg, $token);
76	}
77
78	if ($token[Mustache_Tokenizer::NAME] !== $parent[Mustache_Tokenizer::NAME]) {
79	$msg = sprintf('Nesting error: %s vs. %s', $parent[Mustache_Tokenizer::NAME], $token[Mustache_Tokenizer::NAME]);
80	throw new Mustache_Exception_SyntaxException($msg, $token);
81	}
82
83	$this->clearStandaloneLines($nodes, $tokens);
84	$parent[Mustache_Tokenizer::END] = $token[Mustache_Tokenizer::INDEX];
85	$parent[Mustache_Tokenizer::NODES] = $nodes;
86
87	return $parent;
88	break;
89
90	case Mustache_Tokenizer::T_PARTIAL:
91	case Mustache_Tokenizer::T_PARTIAL_2:
92	// store the whitespace prefix for laters!
93	if ($indent = $this->clearStandaloneLines($nodes, $tokens)) {
94	$token[Mustache_Tokenizer::INDENT] = $indent[Mustache_Tokenizer::VALUE];
95	}
96	$nodes[] = $token;
97	break;
98
99	case Mustache_Tokenizer::T_PRAGMA:
100	case Mustache_Tokenizer::T_COMMENT:
101	$this->clearStandaloneLines($nodes, $tokens);
102	$nodes[] = $token;
103	break;
104
105	default:
106	$nodes[] = $token;
107	break;
108	}
109	}
110
111	if (isset($parent)) {
112	$msg = sprintf('Missing closing tag: %s', $parent[Mustache_Tokenizer::NAME]);
113	throw new Mustache_Exception_SyntaxException($msg, $parent);
114	}
115
116	return $nodes;
117	}
118
119	/**
120	* Clear standalone line tokens.
121	*
122	* Returns a whitespace token for indenting partials, if applicable.
123	*
124	* @param array $nodes Parsed nodes.
125	* @param array $tokens Tokens to be parsed.
126	*
127	* @return array Resulting indent token, if any.
128	*/
129	private function clearStandaloneLines(array &$nodes, array &$tokens)
130	{
131	if ($this->lineTokens > 1) {
132	// this is the third or later node on this line, so it can't be standalone
133	return;
134	}
135
136	$prev = null;
137	if ($this->lineTokens === 1) {
138	// this is the second node on this line, so it can't be standalone
139	// unless the previous node is whitespace.
140	if ($prev = end($nodes)) {
141	if (!$this->tokenIsWhitespace($prev)) {
142	return;
143	}
144	}
145	}
146
147	$next = null;
148	if ($next = reset($tokens)) {
149	// If we're on a new line, bail.
150	if ($next[Mustache_Tokenizer::LINE] !== $this->lineNum) {
151	return;
152	}
153
154	// If the next token isn't whitespace, bail.
155	if (!$this->tokenIsWhitespace($next)) {
156	return;
157	}
158
159	if (count($tokens) !== 1) {
160	// Unless it's the last token in the template, the next token
161	// must end in newline for this to be standalone.
162	if (substr($next[Mustache_Tokenizer::VALUE], -1) !== "\n") {
163	return;
164	}
165	}
166
167	// Discard the whitespace suffix
168	array_shift($tokens);
169	}
170
171	if ($prev) {
172	// Return the whitespace prefix, if any
173	return array_pop($nodes);
174	}
175	}
176
177	/**
178	* Check whether token is a whitespace token.
179	*
180	* True if token type is T_TEXT and value is all whitespace characters.
181	*
182	* @param array $token
183	*
184	* @return boolean True if token is a whitespace token
185	*/
186	private function tokenIsWhitespace(array $token)
187	{
188	if ($token[Mustache_Tokenizer::TYPE] == Mustache_Tokenizer::T_TEXT) {
189	return preg_match('/^\s*$/', $token[Mustache_Tokenizer::VALUE]);
190	}
191
192	return false;
193	}
194	}
195