Python nodes.If方法代码示例

# 需要导入模块: from jinja2 import nodes [as 别名]
# 或者: from jinja2.nodes import If [as 别名]
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'))
            node.elif_ = []
            node.else_ = []
            token = next(self.stream)
            if token.test('name:elif'):
                node = nodes.If(lineno=self.stream.current.lineno)
                result.elif_.append(node)
                continue
            elif token.test('name:else'):
                result.else_ = self.parse_statements(('name:endif',),
                                                     drop_needle=True)
            break
        return result 

# 需要导入模块: from jinja2 import nodes [as 别名]
# 或者: from jinja2.nodes import If [as 别名]
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 

# 需要导入模块: from jinja2 import nodes [as 别名]
# 或者: from jinja2.nodes import If [as 别名]
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 

# 需要导入模块: from jinja2 import nodes [as 别名]
# 或者: from jinja2.nodes import If [as 别名]
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 

# 需要导入模块: from jinja2 import nodes [as 别名]
# 或者: from jinja2.nodes import If [as 别名]
def parse_assign_target(self, with_tuple=True, name_only=False,
                            extra_end_rules=None, with_namespace=False):
        """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
        `with_namespace` is enabled, a namespace assignment may be parsed.
        """
        if with_namespace and self.stream.look().type == 'dot':
            token = self.stream.expect('name')
            next(self.stream)  # dot
            attr = self.stream.expect('name')
            target = nodes.NSRef(token.value, attr.value, lineno=token.lineno)
        elif 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