Skip to content
This repository
Fetching contributors…

Cannot retrieve contributors at this time

file 784 lines (712 sloc) 30.676 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784
# -*- coding: utf-8 -*-
"""
jinja2.parser
~~~~~~~~~~~~~

Implements the template parser.

:copyright: (c) 2009 by the Jinja Team.
:license: BSD, see LICENSE for more details.
"""
from jinja2 import nodes
from jinja2.exceptions import TemplateSyntaxError, TemplateAssertionError
from jinja2.utils import next


_statement_keywords = frozenset(['for', 'if', 'block', 'extends', 'print',
                                 'macro', 'include', 'from', 'import',
                                 'set'])
_compare_operators = frozenset(['eq', 'ne', 'lt', 'lteq', 'gt', 'gteq'])


class Parser(object):
    """This is the central parsing class Jinja2 uses. It's passed to
extensions and can be used to parse expressions or statements.
"""

    def __init__(self, environment, source, name=None, filename=None,
                 state=None):
        self.environment = environment
        self.stream = environment._tokenize(source, name, filename, state)
        self.name = name
        self.filename = filename
        self.closed = False
        self.extensions = {}
        for extension in environment.extensions.itervalues():
            for tag in extension.tags:
                self.extensions[tag] = extension.parse
        self._last_identifier = 0

    def fail(self, msg, lineno=None, exc=TemplateSyntaxError):
        """Convenience method that raises `exc` with the message, passed
line number or last line number as well as the current name and
filename.
"""
        if lineno is None:
            lineno = self.stream.current.lineno
        raise exc(msg, lineno, self.name, self.filename)

    def is_tuple_end(self, extra_end_rules=None):
        """Are we at the end of a tuple?"""
        if self.stream.current.type in ('variable_end', 'block_end', 'rparen'):
            return True
        elif extra_end_rules is not None:
            return self.stream.current.test_any(extra_end_rules)
        return False

    def free_identifier(self, lineno=None):
        """Return a new free identifier as :class:`~jinja2.nodes.InternalName`."""
        self._last_identifier += 1
        rv = object.__new__(nodes.InternalName)
        nodes.Node.__init__(rv, 'fi%d' % self._last_identifier, lineno=lineno)
        return rv

    def parse_statement(self):
        """Parse a single statement."""
        token = self.stream.current
        if token.type != 'name':
            self.fail('tag name expected', token.lineno)
        if token.value in _statement_keywords:
            return getattr(self, 'parse_' + self.stream.current.value)()
        if token.value == 'call':
            return self.parse_call_block()
        if token.value == 'filter':
            return self.parse_filter_block()
        ext = self.extensions.get(token.value)
        if ext is not None:
            return ext(self)
        self.fail('unknown tag %r' % token.value, token.lineno)

    def parse_statements(self, end_tokens, drop_needle=False):
        """Parse multiple statements into a list until one of the end tokens
is reached. This is used to parse the body of statements as it also
parses template data if appropriate. The parser checks first if the
current token is a colon and skips it if there is one. Then it checks
for the block end and parses until if one of the `end_tokens` is
reached. Per default the active token in the stream at the end of
the call is the matched end token. If this is not wanted `drop_needle`
can be set to `True` and the end token is removed.
"""
        # the first token may be a colon for python compatibility
        self.stream.skip_if('colon')

        # in the future it would be possible to add whole code sections
        # by adding some sort of end of statement token and parsing those here.
        self.stream.expect('block_end')
        result = self.subparse(end_tokens)

        if drop_needle:
            next(self.stream)
        return result

    def parse_set(self):
        """Parse an assign statement."""
        lineno = next(self.stream).lineno
        target = self.parse_assign_target()
        self.stream.expect('assign')
        expr = self.parse_tuple()
        return nodes.Assign(target, expr, lineno=lineno)

    def parse_for(self):
        """Parse a for loop."""
        lineno = self.stream.expect('name:for').lineno
        target = self.parse_assign_target(extra_end_rules=('name:in',))
        self.stream.expect('name:in')
        iter = self.parse_tuple(with_condexpr=False,
                                extra_end_rules=('name:recursive',))
        test = None
        if self.stream.skip_if('name:if'):
            test = self.parse_expression()
        recursive = self.stream.skip_if('name:recursive')
        body = self.parse_statements(('name:endfor', 'name:else'))
        if next(self.stream).value == 'endfor':
            else_ = []
        else:
            else_ = self.parse_statements(('name:endfor',), drop_needle=True)
        return nodes.For(target, iter, body, else_, test,
                         recursive, lineno=lineno)

    def parse_if(self):
        """Parse an if construct."""
        node = result = nodes.If(lineno=self.stream.expect('name:if').lineno)
        while 1:
            node.test = self.parse_tuple(with_condexpr=False)
            node.body = self.parse_statements(('name:elif', 'name:else',
                                               'name:endif'))
            token = next(self.stream)
            if token.test('name:elif'):
                new_node = nodes.If(lineno=self.stream.current.lineno)
                node.else_ = [new_node]
                node = new_node
                continue
            elif token.test('name:else'):
                node.else_ = self.parse_statements(('name:endif',),
                                                   drop_needle=True)
            else:
                node.else_ = []
            break
        return result

    def parse_block(self):
        node = nodes.Block(lineno=next(self.stream).lineno)
        node.name = self.stream.expect('name').value
        node.scoped = self.stream.skip_if('name:scoped')
        node.body = self.parse_statements(('name:endblock',), drop_needle=True)
        self.stream.skip_if('name:' + node.name)
        return node

    def parse_extends(self):
        node = nodes.Extends(lineno=next(self.stream).lineno)
        node.template = self.parse_expression()
        return node

    def parse_import_context(self, node, default):
        if self.stream.current.test_any('name:with', 'name:without') and \
           self.stream.look().test('name:context'):
            node.with_context = next(self.stream).value == 'with'
            self.stream.skip()
        else:
            node.with_context = default
        return node

    def parse_include(self):
        node = nodes.Include(lineno=next(self.stream).lineno)
        node.template = self.parse_expression()
        if self.stream.current.test('name:ignore') and \
           self.stream.look().test('name:missing'):
            node.ignore_missing = True
            self.stream.skip(2)
        else:
            node.ignore_missing = False
        return self.parse_import_context(node, True)

    def parse_import(self):
        node = nodes.Import(lineno=next(self.stream).lineno)
        node.template = self.parse_expression()
        self.stream.expect('name:as')
        node.target = self.parse_assign_target(name_only=True).name
        return self.parse_import_context(node, False)

    def parse_from(self):
        node = nodes.FromImport(lineno=next(self.stream).lineno)
        node.template = self.parse_expression()
        self.stream.expect('name:import')
        node.names = []

        def parse_context():
            if self.stream.current.value in ('with', 'without') and \
               self.stream.look().test('name:context'):
                node.with_context = next(self.stream).value == 'with'
                self.stream.skip()
                return True
            return False

        while 1:
            if node.names:
                self.stream.expect('comma')
            if self.stream.current.type == 'name':
                if parse_context():
                    break
                target = self.parse_assign_target(name_only=True)
                if target.name.startswith('_'):
                    self.fail('names starting with an underline can not '
                              'be imported', target.lineno,
                              exc=TemplateAssertionError)
                if self.stream.skip_if('name:as'):
                    alias = self.parse_assign_target(name_only=True)
                    node.names.append((target.name, alias.name))
                else:
                    node.names.append(target.name)
                if parse_context() or self.stream.current.type != 'comma':
                    break
            else:
                break
        if not hasattr(node, 'with_context'):
            node.with_context = False
            self.stream.skip_if('comma')
        return node

    def parse_signature(self, node):
        node.args = args = []
        node.defaults = defaults = []
        self.stream.expect('lparen')
        while self.stream.current.type != 'rparen':
            if args:
                self.stream.expect('comma')
            arg = self.parse_assign_target(name_only=True)
            arg.set_ctx('param')
            if self.stream.skip_if('assign'):
                defaults.append(self.parse_expression())
            args.append(arg)
        self.stream.expect('rparen')

    def parse_call_block(self):
        node = nodes.CallBlock(lineno=next(self.stream).lineno)
        if self.stream.current.type == 'lparen':
            self.parse_signature(node)
        else:
            node.args = []
            node.defaults = []

        node.call = self.parse_expression()
        if not isinstance(node.call, nodes.Call):
            self.fail('expected call', node.lineno)
        node.body = self.parse_statements(('name:endcall',), drop_needle=True)
        return node

    def parse_filter_block(self):
        node = nodes.FilterBlock(lineno=next(self.stream).lineno)
        node.filter = self.parse_filter(None, start_inline=True)
        node.body = self.parse_statements(('name:endfilter',),
                                          drop_needle=True)
        return node

    def parse_macro(self):
        node = nodes.Macro(lineno=next(self.stream).lineno)
        node.name = self.parse_assign_target(name_only=True).name
        self.parse_signature(node)
        node.body = self.parse_statements(('name:endmacro',),
                                          drop_needle=True)
        return node

    def parse_print(self):
        node = nodes.Output(lineno=next(self.stream).lineno)
        node.nodes = []
        while self.stream.current.type != 'block_end':
            if node.nodes:
                self.stream.expect('comma')
            node.nodes.append(self.parse_expression())
        return node

    def parse_assign_target(self, with_tuple=True, name_only=False,
                            extra_end_rules=None):
        """Parse an assignment target. As Jinja2 allows assignments to
tuples, this function can parse all allowed assignment targets. Per
default assignments to tuples are parsed, that can be disable however
by setting `with_tuple` to `False`. If only assignments to names are
wanted `name_only` can be set to `True`. The `extra_end_rules`
parameter is forwarded to the tuple parsing function.
"""
        if name_only:
            token = self.stream.expect('name')
            target = nodes.Name(token.value, 'store', lineno=token.lineno)
        else:
            if with_tuple:
                target = self.parse_tuple(simplified=True,
                                          extra_end_rules=extra_end_rules)
            else:
                target = self.parse_primary(with_postfix=False)
            target.set_ctx('store')
        if not target.can_assign():
            self.fail('can\'t assign to %r' % target.__class__.
                      __name__.lower(), target.lineno)
        return target

    def parse_expression(self, with_condexpr=True):
        """Parse an expression. Per default all expressions are parsed, if
the optional `with_condexpr` parameter is set to `False` conditional
expressions are not parsed.
"""
        if with_condexpr:
            return self.parse_condexpr()
        return self.parse_or()

    def parse_condexpr(self):
        lineno = self.stream.current.lineno
        expr1 = self.parse_or()
        while self.stream.skip_if('name:if'):
            expr2 = self.parse_or()
            if self.stream.skip_if('name:else'):
                expr3 = self.parse_condexpr()
            else:
                expr3 = None
            expr1 = nodes.CondExpr(expr2, expr1, expr3, lineno=lineno)
            lineno = self.stream.current.lineno
        return expr1

    def parse_or(self):
        lineno = self.stream.current.lineno
        left = self.parse_and()
        while self.stream.skip_if('name:or'):
            right = self.parse_and()
            left = nodes.Or(left, right, lineno=lineno)
            lineno = self.stream.current.lineno
        return left

    def parse_and(self):
        lineno = self.stream.current.lineno
        left = self.parse_not()
        while self.stream.skip_if('name:and'):
            right = self.parse_not()
            left = nodes.And(left, right, lineno=lineno)
            lineno = self.stream.current.lineno
        return left

    def parse_not(self):
        if self.stream.current.test('name:not'):
            lineno = next(self.stream).lineno
            return nodes.Not(self.parse_not(), lineno=lineno)
        return self.parse_compare()

    def parse_compare(self):
        lineno = self.stream.current.lineno
        expr = self.parse_add()
        ops = []
        while 1:
            token_type = self.stream.current.type
            if token_type in _compare_operators:
                next(self.stream)
                ops.append(nodes.Operand(token_type, self.parse_add()))
            elif self.stream.skip_if('name:in'):
                ops.append(nodes.Operand('in', self.parse_add()))
            elif self.stream.current.test('name:not') and \
                 self.stream.look().test('name:in'):
                self.stream.skip(2)
                ops.append(nodes.Operand('notin', self.parse_add()))
            else:
                break
            lineno = self.stream.current.lineno
        if not ops:
            return expr
        return nodes.Compare(expr, ops, lineno=lineno)

    def parse_add(self):
        lineno = self.stream.current.lineno
        left = self.parse_sub()
        while self.stream.current.type == 'add':
            next(self.stream)
            right = self.parse_sub()
            left = nodes.Add(left, right, lineno=lineno)
            lineno = self.stream.current.lineno
        return left

    def parse_sub(self):
        lineno = self.stream.current.lineno
        left = self.parse_concat()
        while self.stream.current.type == 'sub':
            next(self.stream)
            right = self.parse_concat()
            left = nodes.Sub(left, right, lineno=lineno)
            lineno = self.stream.current.lineno
        return left

    def parse_concat(self):
        lineno = self.stream.current.lineno
        args = [self.parse_mul()]
        while self.stream.current.type == 'tilde':
            next(self.stream)
            args.append(self.parse_mul())
        if len(args) == 1:
            return args[0]
        return nodes.Concat(args, lineno=lineno)

    def parse_mul(self):
        lineno = self.stream.current.lineno
        left = self.parse_div()
        while self.stream.current.type == 'mul':
            next(self.stream)
            right = self.parse_div()
            left = nodes.Mul(left, right, lineno=lineno)
            lineno = self.stream.current.lineno
        return left

    def parse_div(self):
        lineno = self.stream.current.lineno
        left = self.parse_floordiv()
        while self.stream.current.type == 'div':
            next(self.stream)
            right = self.parse_floordiv()
            left = nodes.Div(left, right, lineno=lineno)
            lineno = self.stream.current.lineno
        return left

    def parse_floordiv(self):
        lineno = self.stream.current.lineno
        left = self.parse_mod()
        while self.stream.current.type == 'floordiv':
            next(self.stream)
            right = self.parse_mod()
            left = nodes.FloorDiv(left, right, lineno=lineno)
            lineno = self.stream.current.lineno
        return left

    def parse_mod(self):
        lineno = self.stream.current.lineno
        left = self.parse_pow()
        while self.stream.current.type == 'mod':
            next(self.stream)
            right = self.parse_pow()
            left = nodes.Mod(left, right, lineno=lineno)
            lineno = self.stream.current.lineno
        return left

    def parse_pow(self):
        lineno = self.stream.current.lineno
        left = self.parse_unary()
        while self.stream.current.type == 'pow':
            next(self.stream)
            right = self.parse_unary()
            left = nodes.Pow(left, right, lineno=lineno)
            lineno = self.stream.current.lineno
        return left

    def parse_unary(self):
        token_type = self.stream.current.type
        lineno = self.stream.current.lineno
        if token_type == 'sub':
            next(self.stream)
            node = self.parse_unary()
            return nodes.Neg(node, lineno=lineno)
        if token_type == 'add':
            next(self.stream)
            node = self.parse_unary()
            return nodes.Pos(node, lineno=lineno)
        return self.parse_primary()

    def parse_primary(self, with_postfix=True):
        token = self.stream.current
        if token.type == 'name':
            if token.value in ('true', 'false', 'True', 'False'):
                node = nodes.Const(token.value in ('true', 'True'),
                                   lineno=token.lineno)
            elif token.value in ('none', 'None'):
                node = nodes.Const(None, lineno=token.lineno)
            else:
                node = nodes.Name(token.value, 'load', lineno=token.lineno)
            next(self.stream)
        elif token.type == 'string':
            next(self.stream)
            buf = [token.value]
            lineno = token.lineno
            while self.stream.current.type == 'string':
                buf.append(self.stream.current.value)
                next(self.stream)
            node = nodes.Const(''.join(buf), lineno=lineno)
        elif token.type in ('integer', 'float'):
            next(self.stream)
            node = nodes.Const(token.value, lineno=token.lineno)
        elif token.type == 'lparen':
            next(self.stream)
            node = self.parse_tuple()
            self.stream.expect('rparen')
        elif token.type == 'lbracket':
            node = self.parse_list()
        elif token.type == 'lbrace':
            node = self.parse_dict()
        else:
            self.fail("unexpected token '%s'" % (token,), token.lineno)
        if with_postfix:
            node = self.parse_postfix(node)
        return node

    def parse_tuple(self, simplified=False, with_condexpr=True,
                    extra_end_rules=None):
        """Works like `parse_expression` but if multiple expressions are
delimited by a comma a :class:`~jinja2.nodes.Tuple` node is created.
This method could also return a regular expression instead of a tuple
if no commas where found.

The default parsing mode is a full tuple. If `simplified` is `True`
only names and literals are parsed. The `no_condexpr` parameter is
forwarded to :meth:`parse_expression`.

Because tuples do not require delimiters and may end in a bogus comma
an extra hint is needed that marks the end of a tuple. For example
for loops support tuples between `for` and `in`. In that case the
`extra_end_rules` is set to ``['name:in']``.
"""
        lineno = self.stream.current.lineno
        if simplified:
            parse = lambda: self.parse_primary(with_postfix=False)
        elif with_condexpr:
            parse = self.parse_expression
        else:
            parse = lambda: self.parse_expression(with_condexpr=False)
        args = []
        is_tuple = False
        while 1:
            if args:
                self.stream.expect('comma')
            if self.is_tuple_end(extra_end_rules):
                break
            args.append(parse())
            if self.stream.current.type == 'comma':
                is_tuple = True
            else:
                break
            lineno = self.stream.current.lineno
        if not is_tuple and args:
            return args[0]
        return nodes.Tuple(args, 'load', lineno=lineno)

    def parse_list(self):
        token = self.stream.expect('lbracket')
        items = []
        while self.stream.current.type != 'rbracket':
            if items:
                self.stream.expect('comma')
            if self.stream.current.type == 'rbracket':
                break
            items.append(self.parse_expression())
        self.stream.expect('rbracket')
        return nodes.List(items, lineno=token.lineno)

    def parse_dict(self):
        token = self.stream.expect('lbrace')
        items = []
        while self.stream.current.type != 'rbrace':
            if items:
                self.stream.expect('comma')
            if self.stream.current.type == 'rbrace':
                break
            key = self.parse_expression()
            self.stream.expect('colon')
            value = self.parse_expression()
            items.append(nodes.Pair(key, value, lineno=key.lineno))
        self.stream.expect('rbrace')
        return nodes.Dict(items, lineno=token.lineno)

    def parse_postfix(self, node):
        while 1:
            token_type = self.stream.current.type
            if token_type == 'dot' or token_type == 'lbracket':
                node = self.parse_subscript(node)
            elif token_type == 'lparen':
                node = self.parse_call(node)
            elif token_type == 'pipe':
                node = self.parse_filter(node)
            elif token_type == 'name' and self.stream.current.value == 'is':
                node = self.parse_test(node)
            else:
                break
        return node

    def parse_subscript(self, node):
        token = next(self.stream)
        if token.type == 'dot':
            attr_token = self.stream.current
            next(self.stream)
            if attr_token.type == 'name':
                return nodes.Getattr(node, attr_token.value, 'load',
                                     lineno=token.lineno)
            elif attr_token.type != 'integer':
                self.fail('expected name or number', attr_token.lineno)
            arg = nodes.Const(attr_token.value, lineno=attr_token.lineno)
            return nodes.Getitem(node, arg, 'load', lineno=token.lineno)
        if token.type == 'lbracket':
            priority_on_attribute = False
            args = []
            while self.stream.current.type != 'rbracket':
                if args:
                    self.stream.expect('comma')
                args.append(self.parse_subscribed())
            self.stream.expect('rbracket')
            if len(args) == 1:
                arg = args[0]
            else:
                arg = nodes.Tuple(args, 'load', lineno=token.lineno)
            return nodes.Getitem(node, arg, 'load', lineno=token.lineno)
        self.fail('expected subscript expression', self.lineno)

    def parse_subscribed(self):
        lineno = self.stream.current.lineno

        if self.stream.current.type == 'colon':
            next(self.stream)
            args = [None]
        else:
            node = self.parse_expression()
            if self.stream.current.type != 'colon':
                return node
            next(self.stream)
            args = [node]

        if self.stream.current.type == 'colon':
            args.append(None)
        elif self.stream.current.type not in ('rbracket', 'comma'):
            args.append(self.parse_expression())
        else:
            args.append(None)

        if self.stream.current.type == 'colon':
            next(self.stream)
            if self.stream.current.type not in ('rbracket', 'comma'):
                args.append(self.parse_expression())
            else:
                args.append(None)
        else:
            args.append(None)

        return nodes.Slice(lineno=lineno, *args)

    def parse_call(self, node):
        token = self.stream.expect('lparen')
        args = []
        kwargs = []
        dyn_args = dyn_kwargs = None
        require_comma = False

        def ensure(expr):
            if not expr:
                self.fail('invalid syntax for function call expression',
                          token.lineno)

        while self.stream.current.type != 'rparen':
            if require_comma:
                self.stream.expect('comma')
                # support for trailing comma
                if self.stream.current.type == 'rparen':
                    break
            if self.stream.current.type == 'mul':
                ensure(dyn_args is None and dyn_kwargs is None)
                next(self.stream)
                dyn_args = self.parse_expression()
            elif self.stream.current.type == 'pow':
                ensure(dyn_kwargs is None)
                next(self.stream)
                dyn_kwargs = self.parse_expression()
            else:
                ensure(dyn_args is None and dyn_kwargs is None)
                if self.stream.current.type == 'name' and \
                    self.stream.look().type == 'assign':
                    key = self.stream.current.value
                    self.stream.skip(2)
                    value = self.parse_expression()
                    kwargs.append(nodes.Keyword(key, value,
                                                lineno=value.lineno))
                else:
                    ensure(not kwargs)
                    args.append(self.parse_expression())

            require_comma = True
        self.stream.expect('rparen')

        if node is None:
            return args, kwargs, dyn_args, dyn_kwargs
        return nodes.Call(node, args, kwargs, dyn_args, dyn_kwargs,
                          lineno=token.lineno)

    def parse_filter(self, node, start_inline=False):
        while self.stream.current.type == 'pipe' or start_inline:
            if not start_inline:
                next(self.stream)
            token = self.stream.expect('name')
            name = token.value
            while self.stream.current.type == 'dot':
                next(self.stream)
                name += '.' + self.stream.expect('name').value
            if self.stream.current.type == 'lparen':
                args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None)
            else:
                args = []
                kwargs = []
                dyn_args = dyn_kwargs = None
            node = nodes.Filter(node, name, args, kwargs, dyn_args,
                                dyn_kwargs, lineno=token.lineno)
            start_inline = False
        return node

    def parse_test(self, node):
        token = next(self.stream)
        if self.stream.current.test('name:not'):
            next(self.stream)
            negated = True
        else:
            negated = False
        name = self.stream.expect('name').value
        while self.stream.current.type == 'dot':
            next(self.stream)
            name += '.' + self.stream.expect('name').value
        dyn_args = dyn_kwargs = None
        kwargs = []
        if self.stream.current.type == 'lparen':
            args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None)
        elif self.stream.current.type in ('name', 'string', 'integer',
                                          'float', 'lparen', 'lbracket',
                                          'lbrace') and not \
             self.stream.current.test_any('name:else', 'name:or',
                                          'name:and'):
            if self.stream.current.test('name:is'):
                self.fail('You cannot chain multiple tests with is')
            args = [self.parse_expression()]
        else:
            args = []
        node = nodes.Test(node, name, args, kwargs, dyn_args,
                          dyn_kwargs, lineno=token.lineno)
        if negated:
            node = nodes.Not(node, lineno=token.lineno)
        return node

    def subparse(self, end_tokens=None):
        body = []
        data_buffer = []
        add_data = data_buffer.append

        def flush_data():
            if data_buffer:
                lineno = data_buffer[0].lineno
                body.append(nodes.Output(data_buffer[:], lineno=lineno))
                del data_buffer[:]

        while self.stream:
            token = self.stream.current
            if token.type == 'data':
                if token.value:
                    add_data(nodes.TemplateData(token.value,
                                                lineno=token.lineno))
                next(self.stream)
            elif token.type == 'variable_begin':
                next(self.stream)
                add_data(self.parse_tuple(with_condexpr=True))
                self.stream.expect('variable_end')
            elif token.type == 'block_begin':
                flush_data()
                next(self.stream)
                if end_tokens is not None and \
                   self.stream.current.test_any(*end_tokens):
                    return body
                rv = self.parse_statement()
                if isinstance(rv, list):
                    body.extend(rv)
                else:
                    body.append(rv)
                self.stream.expect('block_end')
            else:
                raise AssertionError('internal parsing error')

        flush_data()
        return body

    def parse(self):
        """Parse the whole template into a `Template` node."""
        result = nodes.Template(self.subparse(), lineno=1)
        result.set_environment(self.environment)
        return result
Something went wrong with that request. Please try again.