Armin Ronacher | 07bc684 | 2008-03-31 14:18:49 +0200 | [diff] [blame] | 1 | # -*- coding: utf-8 -*- |
| 2 | """ |
| 3 | jinja2.parser |
| 4 | ~~~~~~~~~~~~~ |
| 5 | |
| 6 | Implements the template parser. |
| 7 | |
| 8 | :copyright: 2008 by Armin Ronacher. |
| 9 | :license: BSD, see LICENSE for more details. |
| 10 | """ |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 11 | from jinja2 import nodes |
| 12 | from jinja2.exceptions import TemplateSyntaxError |
Armin Ronacher | 07bc684 | 2008-03-31 14:18:49 +0200 | [diff] [blame] | 13 | |
| 14 | |
| 15 | __all__ = ['Parser'] |
| 16 | |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 17 | _statement_keywords = frozenset(['for', 'if', 'block', 'extends', 'print', |
| 18 | 'macro', 'include']) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 19 | _compare_operators = frozenset(['eq', 'ne', 'lt', 'lteq', 'gt', 'gteq', 'in']) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 20 | _statement_end_tokens = set(['elif', 'else', 'endblock', 'endfilter', |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 21 | 'endfor', 'endif', 'endmacro', 'variable_end', |
| 22 | 'in', 'recursive', 'endcall', 'block_end']) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 23 | |
Armin Ronacher | 07bc684 | 2008-03-31 14:18:49 +0200 | [diff] [blame] | 24 | |
| 25 | class Parser(object): |
Armin Ronacher | d55ab53 | 2008-04-09 16:13:39 +0200 | [diff] [blame] | 26 | """The template parser class. |
Armin Ronacher | 07bc684 | 2008-03-31 14:18:49 +0200 | [diff] [blame] | 27 | |
| 28 | Transforms sourcecode into an abstract syntax tree. |
| 29 | """ |
| 30 | |
| 31 | def __init__(self, environment, source, filename=None): |
| 32 | self.environment = environment |
| 33 | if isinstance(source, str): |
| 34 | source = source.decode(environment.template_charset, 'ignore') |
| 35 | if isinstance(filename, unicode): |
| 36 | filename = filename.encode('utf-8') |
| 37 | self.source = source |
| 38 | self.filename = filename |
| 39 | self.closed = False |
Armin Ronacher | 07bc684 | 2008-03-31 14:18:49 +0200 | [diff] [blame] | 40 | self.no_variable_block = self.environment.lexer.no_variable_block |
| 41 | self.stream = environment.lexer.tokenize(source, filename) |
| 42 | |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 43 | def end_statement(self): |
| 44 | """Make sure that the statement ends properly.""" |
| 45 | if self.stream.current.type is 'semicolon': |
| 46 | self.stream.next() |
| 47 | elif self.stream.current.type not in _statement_end_tokens: |
| 48 | raise TemplateSyntaxError('ambigous end of statement', |
| 49 | self.stream.current.lineno, |
| 50 | self.filename) |
| 51 | |
| 52 | def parse_statement(self): |
| 53 | """Parse a single statement.""" |
| 54 | token_type = self.stream.current.type |
| 55 | if token_type in _statement_keywords: |
| 56 | return getattr(self, 'parse_' + token_type)() |
| 57 | elif token_type is 'call': |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 58 | return self.parse_call_block() |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 59 | lineno = self.stream.current |
Armin Ronacher | 8efc522 | 2008-04-08 14:47:40 +0200 | [diff] [blame] | 60 | expr = self.parse_tuple() |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 61 | if self.stream.current.type == 'assign': |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 62 | result = self.parse_assign(expr) |
| 63 | else: |
| 64 | result = nodes.ExprStmt(expr, lineno=lineno) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 65 | self.end_statement() |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 66 | return result |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 67 | |
| 68 | def parse_assign(self, target): |
| 69 | """Parse an assign statement.""" |
| 70 | lineno = self.stream.expect('assign').lineno |
| 71 | if not target.can_assign(): |
| 72 | raise TemplateSyntaxError("can't assign to '%s'" % |
| 73 | target, target.lineno, |
| 74 | self.filename) |
| 75 | expr = self.parse_tuple() |
| 76 | self.end_statement() |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 77 | target.set_ctx('store') |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 78 | return nodes.Assign(target, expr, lineno=lineno) |
| 79 | |
| 80 | def parse_statements(self, end_tokens, drop_needle=False): |
| 81 | """ |
| 82 | Parse multiple statements into a list until one of the end tokens |
| 83 | is reached. This is used to parse the body of statements as it |
| 84 | also parses template data if appropriate. |
| 85 | """ |
| 86 | # the first token may be a colon for python compatibility |
| 87 | if self.stream.current.type is 'colon': |
| 88 | self.stream.next() |
| 89 | |
| 90 | if self.stream.current.type is 'block_end': |
| 91 | self.stream.next() |
| 92 | result = self.subparse(end_tokens) |
| 93 | else: |
| 94 | result = [] |
| 95 | while self.stream.current.type not in end_tokens: |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 96 | if self.stream.current.type is 'block_end': |
| 97 | self.stream.next() |
| 98 | result.extend(self.subparse(end_tokens)) |
| 99 | break |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 100 | result.append(self.parse_statement()) |
| 101 | if drop_needle: |
| 102 | self.stream.next() |
| 103 | return result |
| 104 | |
| 105 | def parse_for(self): |
| 106 | """Parse a for loop.""" |
| 107 | lineno = self.stream.expect('for').lineno |
| 108 | target = self.parse_tuple(simplified=True) |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 109 | if not target.can_assign(): |
| 110 | raise TemplateSyntaxError("can't assign to '%s'" % |
| 111 | target, target.lineno, |
| 112 | self.filename) |
| 113 | target.set_ctx('store') |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 114 | self.stream.expect('in') |
| 115 | iter = self.parse_tuple() |
| 116 | if self.stream.current.type is 'recursive': |
| 117 | self.stream.next() |
| 118 | recursive = True |
| 119 | else: |
| 120 | recursive = False |
| 121 | body = self.parse_statements(('endfor', 'else')) |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 122 | if self.stream.next().type is 'endfor': |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 123 | else_ = [] |
| 124 | else: |
| 125 | else_ = self.parse_statements(('endfor',), drop_needle=True) |
| 126 | return nodes.For(target, iter, body, else_, False, lineno=lineno) |
| 127 | |
| 128 | def parse_if(self): |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 129 | """Parse an if construct.""" |
| 130 | node = result = nodes.If(lineno=self.stream.expect('if').lineno) |
| 131 | while 1: |
| 132 | # TODO: exclude conditional expressions here |
| 133 | node.test = self.parse_tuple() |
| 134 | node.body = self.parse_statements(('elif', 'else', 'endif')) |
| 135 | token_type = self.stream.next().type |
| 136 | if token_type is 'elif': |
| 137 | new_node = nodes.If(lineno=self.stream.current.lineno) |
| 138 | node.else_ = [new_node] |
| 139 | node = new_node |
| 140 | continue |
| 141 | elif token_type is 'else': |
| 142 | node.else_ = self.parse_statements(('endif',), |
| 143 | drop_needle=True) |
| 144 | else: |
| 145 | node.else_ = [] |
| 146 | break |
| 147 | return result |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 148 | |
| 149 | def parse_block(self): |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 150 | node = nodes.Block(lineno=self.stream.expect('block').lineno) |
| 151 | node.name = self.stream.expect('name').value |
| 152 | node.body = self.parse_statements(('endblock',), drop_needle=True) |
| 153 | return node |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 154 | |
| 155 | def parse_extends(self): |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 156 | node = nodes.Extends(lineno=self.stream.expect('extends').lineno) |
| 157 | node.template = self.parse_expression() |
| 158 | self.end_statement() |
| 159 | return node |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 160 | |
| 161 | def parse_include(self): |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 162 | node = nodes.Include(lineno=self.stream.expect('include').lineno) |
| 163 | expr = self.parse_expression() |
| 164 | if self.stream.current.type is 'assign': |
| 165 | self.stream.next() |
| 166 | if not expr.can_assign(): |
| 167 | raise TemplateSyntaxError('can\'t assign imported template ' |
| 168 | 'to this expression.', expr.lineno, |
| 169 | self.filename) |
| 170 | expr.set_ctx('store') |
| 171 | node.target = expr |
| 172 | node.template = self.parse_expression() |
| 173 | else: |
| 174 | node.target = None |
| 175 | node.template = expr |
| 176 | self.end_statement() |
| 177 | return node |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 178 | |
| 179 | def parse_call_block(self): |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 180 | node = nodes.CallBlock(lineno=self.stream.expect('call').lineno) |
Armin Ronacher | 8edbe49 | 2008-04-10 20:43:43 +0200 | [diff] [blame^] | 181 | node.call = self.parse_expression() |
| 182 | if not isinstance(node.call, nodes.Call): |
| 183 | raise TemplateSyntaxError('expected call', node.lineno, |
| 184 | self.filename) |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 185 | node.body = self.parse_statements(('endcall',), drop_needle=True) |
| 186 | return node |
| 187 | |
| 188 | def parse_macro(self): |
| 189 | node = nodes.Macro(lineno=self.stream.expect('macro').lineno) |
| 190 | node.name = self.stream.expect('name').value |
| 191 | self.stream.expect('lparen') |
| 192 | node.args = args = [] |
| 193 | node.defaults = defaults = [] |
| 194 | while self.stream.current.type is not 'rparen': |
| 195 | if args: |
| 196 | self.stream.expect('comma') |
| 197 | token = self.stream.expect('name') |
| 198 | arg = nodes.Name(token.value, 'param', lineno=token.lineno) |
| 199 | if not arg.can_assign(): |
| 200 | raise TemplateSyntaxError("can't assign to '%s'" % |
| 201 | arg.name, arg.lineno, |
| 202 | self.filename) |
| 203 | if self.stream.current.type is 'assign': |
| 204 | self.stream.next() |
| 205 | defaults.append(self.parse_expression()) |
Armin Ronacher | 8efc522 | 2008-04-08 14:47:40 +0200 | [diff] [blame] | 206 | args.append(arg) |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 207 | self.stream.expect('rparen') |
| 208 | node.body = self.parse_statements(('endmacro',), drop_needle=True) |
| 209 | return node |
| 210 | |
| 211 | def parse_print(self): |
| 212 | node = nodes.Output(lineno=self.stream.expect('print').lineno) |
| 213 | node.nodes = [] |
| 214 | while self.stream.current.type not in _statement_end_tokens: |
| 215 | if node.nodes: |
| 216 | self.stream.expect('comma') |
| 217 | node.nodes.append(self.parse_expression()) |
| 218 | self.end_statement() |
| 219 | return node |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 220 | |
| 221 | def parse_expression(self): |
| 222 | """Parse an expression.""" |
| 223 | return self.parse_condexpr() |
| 224 | |
| 225 | def parse_condexpr(self): |
| 226 | lineno = self.stream.current.lineno |
| 227 | expr1 = self.parse_or() |
| 228 | while self.stream.current.type is 'if': |
| 229 | self.stream.next() |
| 230 | expr2 = self.parse_or() |
| 231 | self.stream.expect('else') |
| 232 | expr3 = self.parse_condexpr() |
| 233 | expr1 = nodes.CondExpr(expr2, expr1, expr3, lineno=lineno) |
| 234 | lineno = self.stream.current.lineno |
| 235 | return expr1 |
| 236 | |
| 237 | def parse_or(self): |
| 238 | lineno = self.stream.current.lineno |
| 239 | left = self.parse_and() |
| 240 | while self.stream.current.type is 'or': |
| 241 | self.stream.next() |
| 242 | right = self.parse_and() |
| 243 | left = nodes.Or(left, right, lineno=lineno) |
| 244 | lineno = self.stream.current.lineno |
| 245 | return left |
| 246 | |
| 247 | def parse_and(self): |
| 248 | lineno = self.stream.current.lineno |
| 249 | left = self.parse_compare() |
| 250 | while self.stream.current.type is 'and': |
| 251 | self.stream.next() |
| 252 | right = self.parse_compare() |
| 253 | left = nodes.And(left, right, lineno=lineno) |
| 254 | lineno = self.stream.current.lineno |
| 255 | return left |
| 256 | |
| 257 | def parse_compare(self): |
| 258 | lineno = self.stream.current.lineno |
| 259 | expr = self.parse_add() |
| 260 | ops = [] |
| 261 | while 1: |
| 262 | token_type = self.stream.current.type |
| 263 | if token_type in _compare_operators: |
| 264 | self.stream.next() |
| 265 | ops.append(nodes.Operand(token_type, self.parse_add())) |
| 266 | elif token_type is 'not' and self.stream.look().type is 'in': |
| 267 | self.stream.skip(2) |
| 268 | ops.append(nodes.Operand('notin', self.parse_add())) |
| 269 | else: |
| 270 | break |
| 271 | lineno = self.stream.current.lineno |
| 272 | if not ops: |
| 273 | return expr |
| 274 | return nodes.Compare(expr, ops, lineno=lineno) |
| 275 | |
| 276 | def parse_add(self): |
| 277 | lineno = self.stream.current.lineno |
| 278 | left = self.parse_sub() |
| 279 | while self.stream.current.type is 'add': |
| 280 | self.stream.next() |
| 281 | right = self.parse_sub() |
| 282 | left = nodes.Add(left, right, lineno=lineno) |
| 283 | lineno = self.stream.current.lineno |
| 284 | return left |
| 285 | |
| 286 | def parse_sub(self): |
| 287 | lineno = self.stream.current.lineno |
| 288 | left = self.parse_concat() |
| 289 | while self.stream.current.type is 'sub': |
| 290 | self.stream.next() |
| 291 | right = self.parse_concat() |
| 292 | left = nodes.Sub(left, right, lineno=lineno) |
| 293 | lineno = self.stream.current.lineno |
| 294 | return left |
| 295 | |
| 296 | def parse_concat(self): |
| 297 | lineno = self.stream.current.lineno |
| 298 | args = [self.parse_mul()] |
| 299 | while self.stream.current.type is 'tilde': |
| 300 | self.stream.next() |
| 301 | args.append(self.parse_mul()) |
| 302 | if len(args) == 1: |
| 303 | return args[0] |
| 304 | return nodes.Concat(args, lineno=lineno) |
| 305 | |
| 306 | def parse_mul(self): |
| 307 | lineno = self.stream.current.lineno |
| 308 | left = self.parse_div() |
| 309 | while self.stream.current.type is 'mul': |
| 310 | self.stream.next() |
| 311 | right = self.parse_div() |
| 312 | left = nodes.Mul(left, right, lineno=lineno) |
| 313 | lineno = self.stream.current.lineno |
| 314 | return left |
| 315 | |
| 316 | def parse_div(self): |
| 317 | lineno = self.stream.current.lineno |
| 318 | left = self.parse_floordiv() |
| 319 | while self.stream.current.type is 'div': |
| 320 | self.stream.next() |
| 321 | right = self.parse_floordiv() |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 322 | left = nodes.Div(left, right, lineno=lineno) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 323 | lineno = self.stream.current.lineno |
| 324 | return left |
| 325 | |
| 326 | def parse_floordiv(self): |
| 327 | lineno = self.stream.current.lineno |
| 328 | left = self.parse_mod() |
| 329 | while self.stream.current.type is 'floordiv': |
| 330 | self.stream.next() |
| 331 | right = self.parse_mod() |
| 332 | left = nodes.FloorDiv(left, right, lineno=lineno) |
| 333 | lineno = self.stream.current.lineno |
| 334 | return left |
| 335 | |
| 336 | def parse_mod(self): |
| 337 | lineno = self.stream.current.lineno |
| 338 | left = self.parse_pow() |
| 339 | while self.stream.current.type is 'mod': |
| 340 | self.stream.next() |
| 341 | right = self.parse_pow() |
| 342 | left = nodes.Mod(left, right, lineno=lineno) |
| 343 | lineno = self.stream.current.lineno |
| 344 | return left |
| 345 | |
| 346 | def parse_pow(self): |
| 347 | lineno = self.stream.current.lineno |
| 348 | left = self.parse_unary() |
| 349 | while self.stream.current.type is 'pow': |
| 350 | self.stream.next() |
| 351 | right = self.parse_unary() |
| 352 | left = nodes.Pow(left, right, lineno=lineno) |
| 353 | lineno = self.stream.current.lineno |
| 354 | return left |
| 355 | |
| 356 | def parse_unary(self): |
| 357 | token_type = self.stream.current.type |
| 358 | lineno = self.stream.current.lineno |
| 359 | if token_type is 'not': |
| 360 | self.stream.next() |
| 361 | node = self.parse_unary() |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 362 | return nodes.Not(node, lineno=lineno) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 363 | if token_type is 'sub': |
| 364 | self.stream.next() |
| 365 | node = self.parse_unary() |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 366 | return nodes.Neg(node, lineno=lineno) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 367 | if token_type is 'add': |
| 368 | self.stream.next() |
| 369 | node = self.parse_unary() |
| 370 | return nodes.Pos(node, lineno=lineno) |
| 371 | return self.parse_primary() |
| 372 | |
| 373 | def parse_primary(self, parse_postfix=True): |
| 374 | token = self.stream.current |
| 375 | if token.type is 'name': |
| 376 | if token.value in ('true', 'false'): |
| 377 | node = nodes.Const(token.value == 'true', lineno=token.lineno) |
| 378 | elif token.value == 'none': |
| 379 | node = nodes.Const(None, lineno=token.lineno) |
| 380 | else: |
| 381 | node = nodes.Name(token.value, 'load', lineno=token.lineno) |
| 382 | self.stream.next() |
| 383 | elif token.type in ('integer', 'float', 'string'): |
| 384 | self.stream.next() |
| 385 | node = nodes.Const(token.value, lineno=token.lineno) |
| 386 | elif token.type is 'lparen': |
| 387 | self.stream.next() |
| 388 | node = self.parse_tuple() |
| 389 | self.stream.expect('rparen') |
| 390 | elif token.type is 'lbracket': |
| 391 | node = self.parse_list() |
| 392 | elif token.type is 'lbrace': |
| 393 | node = self.parse_dict() |
| 394 | else: |
| 395 | raise TemplateSyntaxError("unexpected token '%s'" % |
| 396 | (token,), token.lineno, |
| 397 | self.filename) |
| 398 | if parse_postfix: |
| 399 | node = self.parse_postfix(node) |
| 400 | return node |
| 401 | |
| 402 | def parse_tuple(self, enforce=False, simplified=False): |
| 403 | """ |
| 404 | Parse multiple expressions into a tuple. This can also return |
| 405 | just one expression which is not a tuple. If you want to enforce |
| 406 | a tuple, pass it enforce=True (currently unused). |
| 407 | """ |
| 408 | lineno = self.stream.current.lineno |
| 409 | parse = simplified and self.parse_primary or self.parse_expression |
| 410 | args = [] |
| 411 | is_tuple = False |
| 412 | while 1: |
| 413 | if args: |
| 414 | self.stream.expect('comma') |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 415 | if self.stream.current.type in _statement_end_tokens: |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 416 | break |
| 417 | args.append(parse()) |
| 418 | if self.stream.current.type is not 'comma': |
| 419 | break |
| 420 | is_tuple = True |
| 421 | lineno = self.stream.current.lineno |
| 422 | if not is_tuple and args: |
| 423 | if enforce: |
| 424 | raise TemplateSyntaxError('tuple expected', lineno, |
| 425 | self.filename) |
| 426 | return args[0] |
| 427 | return nodes.Tuple(args, 'load', lineno=lineno) |
| 428 | |
| 429 | def parse_list(self): |
| 430 | token = self.stream.expect('lbracket') |
| 431 | items = [] |
| 432 | while self.stream.current.type is not 'rbracket': |
| 433 | if items: |
| 434 | self.stream.expect('comma') |
| 435 | if self.stream.current.type == 'rbracket': |
| 436 | break |
| 437 | items.append(self.parse_expression()) |
| 438 | self.stream.expect('rbracket') |
| 439 | return nodes.List(items, lineno=token.lineno) |
| 440 | |
| 441 | def parse_dict(self): |
| 442 | token = self.stream.expect('lbrace') |
| 443 | items = [] |
| 444 | while self.stream.current.type is not 'rbrace': |
| 445 | if items: |
| 446 | self.stream.expect('comma') |
| 447 | if self.stream.current.type == 'rbrace': |
| 448 | break |
| 449 | key = self.parse_expression() |
| 450 | self.stream.expect('colon') |
| 451 | value = self.parse_expression() |
| 452 | items.append(nodes.Pair(key, value, lineno=key.lineno)) |
| 453 | self.stream.expect('rbrace') |
| 454 | return nodes.Dict(items, token.lineno, self.filename) |
| 455 | |
| 456 | def parse_postfix(self, node): |
| 457 | while 1: |
| 458 | token_type = self.stream.current.type |
| 459 | if token_type is 'dot' or token_type is 'lbracket': |
| 460 | node = self.parse_subscript(node) |
| 461 | elif token_type is 'lparen': |
| 462 | node = self.parse_call(node) |
| 463 | elif token_type is 'pipe': |
| 464 | node = self.parse_filter(node) |
| 465 | elif token_type is 'is': |
| 466 | node = self.parse_test(node) |
| 467 | else: |
| 468 | break |
| 469 | return node |
| 470 | |
| 471 | def parse_subscript(self, node): |
| 472 | token = self.stream.next() |
| 473 | if token.type is 'dot': |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 474 | attr_token = self.stream.current |
| 475 | if attr_token.type not in ('name', 'integer'): |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 476 | raise TemplateSyntaxError('expected name or number', |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 477 | attr_token.lineno, self.filename) |
| 478 | arg = nodes.Const(attr_token.value, lineno=attr_token.lineno) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 479 | self.stream.next() |
| 480 | elif token.type is 'lbracket': |
| 481 | args = [] |
| 482 | while self.stream.current.type is not 'rbracket': |
| 483 | if args: |
| 484 | self.stream.expect('comma') |
| 485 | args.append(self.parse_subscribed()) |
| 486 | self.stream.expect('rbracket') |
| 487 | if len(args) == 1: |
| 488 | arg = args[0] |
| 489 | else: |
| 490 | arg = nodes.Tuple(args, lineno, self.filename) |
| 491 | else: |
| 492 | raise TemplateSyntaxError('expected subscript expression', |
| 493 | self.lineno, self.filename) |
| 494 | return nodes.Subscript(node, arg, 'load', lineno=token.lineno) |
| 495 | |
| 496 | def parse_subscribed(self): |
| 497 | lineno = self.stream.current.lineno |
| 498 | |
| 499 | if self.stream.current.type is 'colon': |
| 500 | self.stream.next() |
| 501 | args = [None] |
| 502 | else: |
| 503 | node = self.parse_expression() |
| 504 | if self.stream.current.type is not 'colon': |
| 505 | return node |
| 506 | self.stream.next() |
| 507 | args = [node] |
| 508 | |
| 509 | if self.stream.current.type is 'colon': |
| 510 | args.append(None) |
| 511 | elif self.stream.current.type not in ('rbracket', 'comma'): |
| 512 | args.append(self.parse_expression()) |
| 513 | else: |
| 514 | args.append(None) |
| 515 | |
| 516 | if self.stream.current.type is 'colon': |
| 517 | self.stream.next() |
| 518 | if self.stream.current.type not in ('rbracket', 'comma'): |
| 519 | args.append(self.parse_expression()) |
| 520 | else: |
| 521 | args.append(None) |
| 522 | else: |
| 523 | args.append(None) |
| 524 | |
| 525 | return nodes.Slice(lineno=lineno, *args) |
| 526 | |
| 527 | def parse_call(self, node): |
| 528 | token = self.stream.expect('lparen') |
| 529 | args = [] |
| 530 | kwargs = [] |
| 531 | dyn_args = dyn_kwargs = None |
| 532 | require_comma = False |
| 533 | |
| 534 | def ensure(expr): |
| 535 | if not expr: |
| 536 | raise TemplateSyntaxError('invalid syntax for function ' |
| 537 | 'call expression', token.lineno, |
| 538 | self.filename) |
| 539 | |
| 540 | while self.stream.current.type is not 'rparen': |
| 541 | if require_comma: |
| 542 | self.stream.expect('comma') |
| 543 | # support for trailing comma |
| 544 | if self.stream.current.type is 'rparen': |
| 545 | break |
| 546 | if self.stream.current.type is 'mul': |
| 547 | ensure(dyn_args is None and dyn_kwargs is None) |
| 548 | self.stream.next() |
| 549 | dyn_args = self.parse_expression() |
| 550 | elif self.stream.current.type is 'pow': |
| 551 | ensure(dyn_kwargs is None) |
| 552 | self.stream.next() |
| 553 | dyn_kwargs = self.parse_expression() |
| 554 | else: |
| 555 | ensure(dyn_args is None and dyn_kwargs is None) |
| 556 | if self.stream.current.type is 'name' and \ |
| 557 | self.stream.look().type is 'assign': |
| 558 | key = self.stream.current.value |
| 559 | self.stream.skip(2) |
Armin Ronacher | 8efc522 | 2008-04-08 14:47:40 +0200 | [diff] [blame] | 560 | kwargs.append(nodes.Keyword(key, self.parse_expression(), |
| 561 | lineno=key.lineno)) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 562 | else: |
| 563 | ensure(not kwargs) |
| 564 | args.append(self.parse_expression()) |
| 565 | |
| 566 | require_comma = True |
| 567 | self.stream.expect('rparen') |
| 568 | |
| 569 | if node is None: |
| 570 | return args, kwargs, dyn_args, dyn_kwargs |
| 571 | return nodes.Call(node, args, kwargs, dyn_args, dyn_kwargs, |
| 572 | lineno=token.lineno) |
| 573 | |
| 574 | def parse_filter(self, node): |
| 575 | lineno = self.stream.current.type |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 576 | while self.stream.current.type == 'pipe': |
| 577 | self.stream.next() |
| 578 | token = self.stream.expect('name') |
| 579 | if self.stream.current.type is 'lparen': |
| 580 | args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None) |
| 581 | else: |
| 582 | args = [] |
| 583 | kwargs = [] |
| 584 | dyn_args = dyn_kwargs = None |
Armin Ronacher | d55ab53 | 2008-04-09 16:13:39 +0200 | [diff] [blame] | 585 | node = nodes.Filter(node, token.value, args, kwargs, dyn_args, |
| 586 | dyn_kwargs, lineno=token.lineno) |
| 587 | return node |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 588 | |
| 589 | def parse_test(self, node): |
| 590 | token = self.stream.expect('is') |
| 591 | if self.stream.current.type is 'not': |
| 592 | self.stream.next() |
| 593 | negated = True |
| 594 | else: |
| 595 | negated = False |
| 596 | name = self.stream.expect('name').value |
| 597 | if self.stream.current.type is 'lparen': |
| 598 | args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None) |
| 599 | elif self.stream.current.type in ('name', 'string', 'integer', |
| 600 | 'float', 'lparen', 'lbracket', |
| 601 | 'lbrace', 'regex'): |
| 602 | args = [self.parse_expression()] |
| 603 | else: |
| 604 | args = [] |
| 605 | kwargs = [] |
| 606 | dyn_args = dyn_kwargs = None |
| 607 | node = nodes.Test(node, name, args, kwargs, dyn_args, |
| 608 | dyn_kwargs, lineno=token.lineno) |
| 609 | if negated: |
| 610 | node = nodes.NotExpression(node, lineno=token.lineno) |
| 611 | return node |
| 612 | |
| 613 | def subparse(self, end_tokens=None): |
| 614 | body = [] |
| 615 | data_buffer = [] |
| 616 | add_data = data_buffer.append |
| 617 | |
| 618 | def flush_data(): |
| 619 | if data_buffer: |
| 620 | lineno = data_buffer[0].lineno |
| 621 | body.append(nodes.Output(data_buffer[:], lineno=lineno)) |
| 622 | del data_buffer[:] |
| 623 | |
| 624 | while self.stream: |
| 625 | token = self.stream.current |
| 626 | if token.type is 'data': |
| 627 | add_data(nodes.Const(token.value, lineno=token.lineno)) |
| 628 | self.stream.next() |
| 629 | elif token.type is 'variable_begin': |
| 630 | self.stream.next() |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 631 | want_comma = False |
| 632 | while not self.stream.current.type in _statement_end_tokens: |
| 633 | if want_comma: |
| 634 | self.stream.expect('comma') |
| 635 | add_data(self.parse_expression()) |
| 636 | want_comma = True |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 637 | self.stream.expect('variable_end') |
| 638 | elif token.type is 'block_begin': |
| 639 | flush_data() |
| 640 | self.stream.next() |
| 641 | if end_tokens is not None and \ |
| 642 | self.stream.current.type in end_tokens: |
| 643 | return body |
| 644 | while self.stream.current.type is not 'block_end': |
| 645 | body.append(self.parse_statement()) |
| 646 | self.stream.expect('block_end') |
| 647 | else: |
| 648 | raise AssertionError('internal parsing error') |
| 649 | |
| 650 | flush_data() |
| 651 | return body |
| 652 | |
| 653 | def parse(self): |
| 654 | """Parse the whole template into a `Template` node.""" |
Armin Ronacher | d55ab53 | 2008-04-09 16:13:39 +0200 | [diff] [blame] | 655 | result = nodes.Template(self.subparse(), lineno=1) |
| 656 | result.set_environment(self.environment) |
| 657 | return result |