| # -*- coding: utf-8 -*- |
| """ |
| jinja2.parser |
| ~~~~~~~~~~~~~ |
| |
| Implements the template parser. |
| |
| :copyright: (c) 2010 by the Jinja Team. |
| :license: BSD, see LICENSE for more details. |
| """ |
| from jinja2 import nodes |
| from jinja2.exceptions import TemplateSyntaxError, TemplateAssertionError |
| from jinja2.lexer import describe_token, describe_token_expr |
| from jinja2._compat import next, imap |
| |
| |
| #: statements that callinto |
| _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.iter_extensions(): |
| for tag in extension.tags: |
| self.extensions[tag] = extension.parse |
| self._last_identifier = 0 |
| self._tag_stack = [] |
| self._end_token_stack = [] |
| |
| 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 _fail_ut_eof(self, name, end_token_stack, lineno): |
| expected = [] |
| for exprs in end_token_stack: |
| expected.extend(imap(describe_token_expr, exprs)) |
| if end_token_stack: |
| currently_looking = ' or '.join( |
| "'%s'" % describe_token_expr(expr) |
| for expr in end_token_stack[-1]) |
| else: |
| currently_looking = None |
| |
| if name is None: |
| message = ['Unexpected end of template.'] |
| else: |
| message = ['Encountered unknown tag \'%s\'.' % name] |
| |
| if currently_looking: |
| if name is not None and name in expected: |
| message.append('You probably made a nesting mistake. Jinja ' |
| 'is expecting this tag, but currently looking ' |
| 'for %s.' % currently_looking) |
| else: |
| message.append('Jinja was looking for the following tags: ' |
| '%s.' % currently_looking) |
| |
| if self._tag_stack: |
| message.append('The innermost block that needs to be ' |
| 'closed is \'%s\'.' % self._tag_stack[-1]) |
| |
| self.fail(' '.join(message), lineno) |
| |
| def fail_unknown_tag(self, name, lineno=None): |
| """Called if the parser encounters an unknown tag. Tries to fail |
| with a human readable error message that could help to identify |
| the problem. |
| """ |
| return self._fail_ut_eof(name, self._end_token_stack, lineno) |
| |
| def fail_eof(self, end_tokens=None, lineno=None): |
| """Like fail_unknown_tag but for end of template situations.""" |
| stack = list(self._end_token_stack) |
| if end_tokens is not None: |
| stack.append(end_tokens) |
| return self._fail_ut_eof(None, stack, lineno) |
| |
| 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) |
| self._tag_stack.append(token.value) |
| pop_tag = True |
| try: |
| 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) |
| |
| # did not work out, remove the token we pushed by accident |
| # from the stack so that the unknown tag fail function can |
| # produce a proper error message. |
| self._tag_stack.pop() |
| pop_tag = False |
| self.fail_unknown_tag(token.value, token.lineno) |
| finally: |
| if pop_tag: |
| self._tag_stack.pop() |
| |
| 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) |
| |
| # we reached the end of the template too early, the subparser |
| # does not check for this, so we do that now |
| if self.stream.current.type == 'eof': |
| self.fail_eof(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') |
| |
| # common problem people encounter when switching from django |
| # to jinja. we do not support hyphens in block names, so let's |
| # raise a nicer error message in that case. |
| if self.stream.current.type == 'sub': |
| self.fail('Block names in Jinja have to be valid Python ' |
| 'identifiers and may not contain hyphens, use an ' |
| 'underscore instead.') |
| |
| 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() |
| 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, with_filter=True): |
| token_type = self.stream.current.type |
| lineno = self.stream.current.lineno |
| if token_type == 'sub': |
| next(self.stream) |
| node = nodes.Neg(self.parse_unary(False), lineno=lineno) |
| elif token_type == 'add': |
| next(self.stream) |
| node = nodes.Pos(self.parse_unary(False), lineno=lineno) |
| else: |
| node = self.parse_primary() |
| node = self.parse_postfix(node) |
| if with_filter: |
| node = self.parse_filter_expr(node) |
| return node |
| |
| def parse_primary(self): |
| 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(explicit_parentheses=True) |
| self.stream.expect('rparen') |
| elif token.type == 'lbracket': |
| node = self.parse_list() |
| elif token.type == 'lbrace': |
| node = self.parse_dict() |
| else: |
| self.fail("unexpected '%s'" % describe_token(token), token.lineno) |
| return node |
| |
| def parse_tuple(self, simplified=False, with_condexpr=True, |
| extra_end_rules=None, explicit_parentheses=False): |
| """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']``. |
| |
| `explicit_parentheses` is true if the parsing was triggered by an |
| expression in parentheses. This is used to figure out if an empty |
| tuple is a valid expression or not. |
| """ |
| lineno = self.stream.current.lineno |
| if simplified: |
| parse = self.parse_primary |
| 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: |
| if args: |
| return args[0] |
| |
| # if we don't have explicit parentheses, an empty tuple is |
| # not a valid expression. This would mean nothing (literally |
| # nothing) in the spot of an expression would be an empty |
| # tuple. |
| if not explicit_parentheses: |
| self.fail('Expected an expression, got \'%s\'' % |
| describe_token(self.stream.current)) |
| |
| 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) |
| # calls are valid both after postfix expressions (getattr |
| # and getitem) as well as filters and tests |
| elif token_type == 'lparen': |
| node = self.parse_call(node) |
| else: |
| break |
| return node |
| |
| def parse_filter_expr(self, node): |
| while 1: |
| token_type = self.stream.current.type |
| if token_type == 'pipe': |
| node = self.parse_filter(node) |
| elif token_type == 'name' and self.stream.current.value == 'is': |
| node = self.parse_test(node) |
| # calls are valid both after postfix expressions (getattr |
| # and getitem) as well as filters and tests |
| elif token_type == 'lparen': |
| node = self.parse_call(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': |
| 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 |
| |
| if end_tokens is not None: |
| self._end_token_stack.append(end_tokens) |
| |
| def flush_data(): |
| if data_buffer: |
| lineno = data_buffer[0].lineno |
| body.append(nodes.Output(data_buffer[:], lineno=lineno)) |
| del data_buffer[:] |
| |
| try: |
| 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() |
| finally: |
| if end_tokens is not None: |
| self._end_token_stack.pop() |
| |
| 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 |
