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  1: <?php
  2: 
  3: /**
  4:  * This file is part of the Nette Framework (http://nette.org)
  5:  *
  6:  * Copyright (c) 2004 David Grudl (http://davidgrudl.com)
  7:  *
  8:  * For the full copyright and license information, please view
  9:  * the file license.txt that was distributed with this source code.
 10:  */
 11: 
 12: namespace Nette\Latte;
 13: 
 14: use Nette,
 15:     Nette\Utils\Strings;
 16: 
 17: 
 18: 
 19: /**
 20:  * Latte parser.
 21:  *
 22:  * @author     David Grudl
 23:  */
 24: class Parser extends Nette\Object
 25: {
 26:     /** @internal regular expression for single & double quoted PHP string */
 27:     const RE_STRING = '\'(?:\\\\.|[^\'\\\\])*\'|"(?:\\\\.|[^"\\\\])*"';
 28: 
 29:     /** @internal special HTML attribute prefix */
 30:     const N_PREFIX = 'n:';
 31: 
 32:     /** @var string default macro syntax */
 33:     public $defaultSyntax = 'latte';
 34: 
 35:     /** @var array */
 36:     public $syntaxes = array(
 37:         'latte' => array('\\{(?![\\s\'"{}])', '\\}'), // {...}
 38:         'double' => array('\\{\\{(?![\\s\'"{}])', '\\}\\}'), // {{...}}
 39:         'asp' => array('<%\s*', '\s*%>'), /* <%...%> */
 40:         'python' => array('\\{[{%]\s*', '\s*[%}]\\}'), // {% ... %} | {{ ... }}
 41:         'off' => array('[^\x00-\xFF]', ''),
 42:     );
 43: 
 44:     /** @var string */
 45:     private $macroRe;
 46: 
 47:     /** @var string source template */
 48:     private $input;
 49: 
 50:     /** @var array of Token */
 51:     private $output;
 52: 
 53:     /** @var int  position on source template */
 54:     private $offset;
 55: 
 56:     /** @var array */
 57:     private $context;
 58: 
 59:     /** @var string */
 60:     private $lastTag;
 61: 
 62:     /** @var string used by filter() */
 63:     private $endTag;
 64: 
 65:     /** @var bool */
 66:     private $xmlMode;
 67: 
 68:     /** @internal states */
 69:     const CONTEXT_TEXT = 'text',
 70:         CONTEXT_CDATA = 'cdata',
 71:         CONTEXT_TAG = 'tag',
 72:         CONTEXT_ATTRIBUTE = 'attribute',
 73:         CONTEXT_NONE = 'none',
 74:         CONTEXT_COMMENT = 'comment';
 75: 
 76: 
 77: 
 78:     /**
 79:      * Process all {macros} and <tags/>.
 80:      * @param  string
 81:      * @return array
 82:      */
 83:     public function parse($input)
 84:     {
 85:         if (substr($input, 0, 3) === "\xEF\xBB\xBF") { // BOM
 86:             $input = substr($input, 3);
 87:         }
 88:         if (!Strings::checkEncoding($input)) {
 89:             throw new Nette\InvalidArgumentException('Template is not valid UTF-8 stream.');
 90:         }
 91:         $input = str_replace("\r\n", "\n", $input);
 92:         $this->input = $input;
 93:         $this->output = array();
 94:         $this->offset = 0;
 95: 
 96:         $this->setSyntax($this->defaultSyntax);
 97:         $this->setContext(self::CONTEXT_TEXT);
 98:         $this->lastTag = $this->endTag = NULL;
 99:         $this->xmlMode = (bool) preg_match('#^<\?xml\s#m', $input);
100: 
101:         while ($this->offset < strlen($input)) {
102:             $matches = $this->{"context".$this->context[0]}();
103: 
104:             if (!$matches) { // EOF
105:                 break;
106: 
107:             } elseif (!empty($matches['comment'])) { // {* *}
108:                 $this->addToken(Token::COMMENT, $matches[0]);
109: 
110:             } elseif (!empty($matches['macro'])) { // {macro}
111:                 $token = $this->addToken(Token::MACRO, $matches[0]);
112:                 list($token->name, $token->value, $token->modifiers) = $this->parseMacro($matches['macro']);
113:             }
114: 
115:             $this->filter();
116:         }
117: 
118:         if ($this->offset < strlen($input)) {
119:             $this->addToken(Token::TEXT, substr($this->input, $this->offset));
120:         }
121:         return $this->output;
122:     }
123: 
124: 
125: 
126:     /**
127:      * Handles CONTEXT_TEXT.
128:      */
129:     private function contextText()
130:     {
131:         $matches = $this->match('~
132:             (?:(?<=\n|^)[ \t]*)?<(?P<closing>/?)(?P<tag>[a-z0-9:]+)|  ##  begin of HTML tag <tag </tag - ignores <!DOCTYPE
133:             <(?P<htmlcomment>!--)|     ##  begin of HTML comment <!--
134:             '.$this->macroRe.'         ##  macro
135:         ~xsi');
136: 
137:         if (!empty($matches['htmlcomment'])) { // <!--
138:             $this->addToken(Token::TAG_BEGIN, $matches[0]);
139:             $this->setContext(self::CONTEXT_COMMENT);
140: 
141:         } elseif (!empty($matches['tag'])) { // <tag or </tag
142:             $token = $this->addToken(Token::TAG_BEGIN, $matches[0]);
143:             $token->name = $matches['tag'];
144:             $token->closing = (bool) $matches['closing'];
145:             $this->lastTag = $matches['closing'] . strtolower($matches['tag']);
146:             $this->setContext(self::CONTEXT_TAG);
147:         }
148:         return $matches;
149:     }
150: 
151: 
152: 
153:     /**
154:      * Handles CONTEXT_CDATA.
155:      */
156:     private function contextCData()
157:     {
158:         $matches = $this->match('~
159:             </(?P<tag>'.$this->lastTag.')(?![a-z0-9:])| ##  end HTML tag </tag
160:             '.$this->macroRe.'              ##  macro
161:         ~xsi');
162: 
163:         if (!empty($matches['tag'])) { // </tag
164:             $token = $this->addToken(Token::TAG_BEGIN, $matches[0]);
165:             $token->name = $this->lastTag;
166:             $token->closing = TRUE;
167:             $this->lastTag = '/' . $this->lastTag;
168:             $this->setContext(self::CONTEXT_TAG);
169:         }
170:         return $matches;
171:     }
172: 
173: 
174: 
175:     /**
176:      * Handles CONTEXT_TAG.
177:      */
178:     private function contextTag()
179:     {
180:         $matches = $this->match('~
181:             (?P<end>\ ?/?>)([ \t]*\n)?|  ##  end of HTML tag
182:             '.$this->macroRe.'|          ##  macro
183:             \s*(?P<attr>[^\s/>={]+)(?:\s*=\s*(?P<value>["\']|[^\s/>{]+))? ## begin of HTML attribute
184:         ~xsi');
185: 
186:         if (!empty($matches['end'])) { // end of HTML tag />
187:             $this->addToken(Token::TAG_END, $matches[0]);
188:             $this->setContext(!$this->xmlMode && in_array($this->lastTag, array('script', 'style')) ? self::CONTEXT_CDATA : self::CONTEXT_TEXT);
189: 
190:         } elseif (!empty($matches['attr'])) { // HTML attribute
191:             $token = $this->addToken(Token::ATTRIBUTE, $matches[0]);
192:             $token->name = $matches['attr'];
193:             $token->value = isset($matches['value']) ? $matches['value'] : '';
194: 
195:             if ($token->value === '"' || $token->value === "'") { // attribute = "'
196:                 if (Strings::startsWith($token->name, self::N_PREFIX)) {
197:                     $token->value = '';
198:                     if ($m = $this->match('~(.*?)' . $matches['value'] . '~xsi')) {
199:                         $token->value = $m[1];
200:                         $token->text .= $m[0];
201:                     }
202:                 } else {
203:                     $this->setContext(self::CONTEXT_ATTRIBUTE, $matches['value']);
204:                 }
205:             }
206:         }
207:         return $matches;
208:     }
209: 
210: 
211: 
212:     /**
213:      * Handles CONTEXT_ATTRIBUTE.
214:      */
215:     private function contextAttribute()
216:     {
217:         $matches = $this->match('~
218:             (?P<quote>'.$this->context[1].')|  ##  end of HTML attribute
219:             '.$this->macroRe.'                 ##  macro
220:         ~xsi');
221: 
222:         if (!empty($matches['quote'])) { // (attribute end) '"
223:             $this->addToken(Token::TEXT, $matches[0]);
224:             $this->setContext(self::CONTEXT_TAG);
225:         }
226:         return $matches;
227:     }
228: 
229: 
230: 
231:     /**
232:      * Handles CONTEXT_COMMENT.
233:      */
234:     private function contextComment()
235:     {
236:         $matches = $this->match('~
237:             (?P<htmlcomment>--\s*>)|   ##  end of HTML comment
238:             '.$this->macroRe.'         ##  macro
239:         ~xsi');
240: 
241:         if (!empty($matches['htmlcomment'])) { // --\s*>
242:             $this->addToken(Token::TAG_END, $matches[0]);
243:             $this->setContext(self::CONTEXT_TEXT);
244:         }
245:         return $matches;
246:     }
247: 
248: 
249: 
250:     /**
251:      * Handles CONTEXT_NONE.
252:      */
253:     private function contextNone()
254:     {
255:         $matches = $this->match('~
256:             '.$this->macroRe.'     ##  macro
257:         ~xsi');
258:         return $matches;
259:     }
260: 
261: 
262: 
263:     /**
264:      * Matches next token.
265:      * @param  string
266:      * @return array
267:      */
268:     private function match($re)
269:     {
270:         if ($matches = Strings::match($this->input, $re, PREG_OFFSET_CAPTURE, $this->offset)) {
271:             $value = substr($this->input, $this->offset, $matches[0][1] - $this->offset);
272:             if ($value !== '') {
273:                 $this->addToken(Token::TEXT, $value);
274:             }
275:             $this->offset = $matches[0][1] + strlen($matches[0][0]);
276:             foreach ($matches as $k => $v) $matches[$k] = $v[0];
277:         }
278:         return $matches;
279:     }
280: 
281: 
282: 
283:     /**
284:      * @return Parser  provides a fluent interface
285:      */
286:     public function setContext($context, $quote = NULL)
287:     {
288:         $this->context = array($context, $quote);
289:         return $this;
290:     }
291: 
292: 
293: 
294:     /**
295:      * Changes macro delimiters.
296:      * @param  string
297:      * @return Parser  provides a fluent interface
298:      */
299:     public function setSyntax($type)
300:     {
301:         $type = $type ?: $this->defaultSyntax;
302:         if (isset($this->syntaxes[$type])) {
303:             $this->setDelimiters($this->syntaxes[$type][0], $this->syntaxes[$type][1]);
304:         } else {
305:             throw new Nette\InvalidArgumentException("Unknown syntax '$type'");
306:         }
307:         return $this;
308:     }
309: 
310: 
311: 
312:     /**
313:      * Changes macro delimiters.
314:      * @param  string  left regular expression
315:      * @param  string  right regular expression
316:      * @return Parser  provides a fluent interface
317:      */
318:     public function setDelimiters($left, $right)
319:     {
320:         $this->macroRe = '
321:             (?P<comment>' . $left . '\\*.*?\\*' . $right . '\n{0,2})|
322:             ' . $left . '
323:                 (?P<macro>(?:' . self::RE_STRING . '|\{
324:                         (?P<inner>' . self::RE_STRING . '|\{(?P>inner)\}|[^\'"{}])*+
325:                 \}|[^\'"{}])+?)
326:             ' . $right . '
327:             (?P<rmargin>[ \t]*(?=\n))?
328:         ';
329:         return $this;
330:     }
331: 
332: 
333: 
334:     /**
335:      * Parses macro to name, arguments a modifiers parts.
336:      * @param  string {name arguments | modifiers}
337:      * @return array
338:      */
339:     public function parseMacro($macro)
340:     {
341:         $match = Strings::match($macro, '~^
342:             (
343:                 (?P<name>\?|/?[a-z]\w*+(?:[.:]\w+)*+(?!::|\())|   ## ?, name, /name, but not function( or class::
344:                 (?P<noescape>!?)(?P<shortname>/?[=\~#%^&_]?)      ## [!] [=] expression to print
345:             )(?P<args>.*?)
346:             (?P<modifiers>\|[a-z](?:'.Parser::RE_STRING.'|[^\'"]+)*)?
347:         ()$~isx');
348: 
349:         if (!$match) {
350:             return FALSE;
351:         }
352:         if ($match['name'] === '') {
353:             $match['name'] = $match['shortname'] ?: '=';
354:             if (!$match['noescape'] && substr($match['shortname'], 0, 1) !== '/') {
355:                 $match['modifiers'] .= '|escape';
356:             }
357:         }
358:         return array($match['name'], trim($match['args']), $match['modifiers']);
359:     }
360: 
361: 
362: 
363:     private function addToken($type, $text)
364:     {
365:         $this->output[] = $token = new Token;
366:         $token->type = $type;
367:         $token->text = $text;
368:         $token->line = substr_count($this->input, "\n", 0, max(1, $this->offset - 1)) + 1;
369:         return $token;
370:     }
371: 
372: 
373: 
374:     /**
375:      * Process low-level macros.
376:      */
377:     protected function filter()
378:     {
379:         $token = end($this->output);
380:         if ($token->type === Token::MACRO && $token->name === '/syntax') {
381:             $this->setSyntax($this->defaultSyntax);
382:             $token->type = Token::COMMENT;
383: 
384:         } elseif ($token->type === Token::MACRO && $token->name === 'syntax') {
385:             $this->setSyntax($token->value);
386:             $token->type = Token::COMMENT;
387: 
388:         } elseif ($token->type === Token::ATTRIBUTE && $token->name === 'n:syntax') {
389:             $this->setSyntax($token->value);
390:             $this->endTag = '/' . $this->lastTag;
391:             $token->type = Token::COMMENT;
392: 
393:         } elseif ($token->type === Token::TAG_END && $this->lastTag === $this->endTag) {
394:             $this->setSyntax($this->defaultSyntax);
395: 
396:         } elseif ($token->type === Token::MACRO && $token->name === 'contentType') {
397:             if (preg_match('#html|xml#', $token->value, $m)) {
398:                 $this->xmlMode = $m[0] === 'xml';
399:                 $this->setContext(self::CONTEXT_TEXT);
400:             } else {
401:                 $this->setContext(self::CONTEXT_NONE);
402:             }
403:         }
404:     }
405: 
406: }
407: 
Nette Framework 2.0.0 API API documentation generated by ApiGen 2.7.0