'NoneType' has no attribute start when calling {% url %} on #[a(href)]-style tags

[gwennlbh]

• pypugjs version:5.8.1
• Django version:2.2.1
• Python version:3.6.8
• Operating System:Linux Pop!_OS 18.10

Description

I was trying to incorporate a url block in a embedded anchor tag's href:

p Test and #[a.thing(href="{% url 'stuff' %}") lorem ipsum]

What I Did

Traceback:

Internal Server Error: /news/subscribe
Traceback (most recent call last):
  File "/home/ewen/.local/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/home/ewen/.local/lib/python3.6/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/ewen/.local/lib/python3.6/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/ewen/Coding/projects/mx3creations/newsletter/views.py", line 27, in subscribe
    return render(request, 'subscribe.pug', locals())
  File "/home/ewen/.local/lib/python3.6/site-packages/django/shortcuts.py", line 36, in render
    content = loader.render_to_string(template_name, context, request, using=using)
  File "/home/ewen/.local/lib/python3.6/site-packages/django/template/loader.py", line 61, in render_to_string
    template = get_template(template_name, using=using)
  File "/home/ewen/.local/lib/python3.6/site-packages/django/template/loader.py", line 15, in get_template
    return engine.get_template(template_name)
  File "/home/ewen/.local/lib/python3.6/site-packages/django/template/backends/django.py", line 34, in get_template
    return Template(self.engine.get_template(template_name), self)
  File "/home/ewen/.local/lib/python3.6/site-packages/django/template/engine.py", line 143, in get_template
    template, origin = self.find_template(template_name)
  File "/home/ewen/.local/lib/python3.6/site-packages/django/template/engine.py", line 125, in find_template
    template = loader.get_template(name, skip=skip)
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/ext/django/loader.py", line 43, in get_template
    return super(cached.Loader, self).get_template(template_name, **kwargs)
  File "/home/ewen/.local/lib/python3.6/site-packages/django/template/loaders/base.py", line 24, in get_template
    contents = self.get_contents(origin)
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/ext/django/loader.py", line 33, in get_contents
    contents, filename=origin.template_name, compiler=Compiler
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/utils.py", line 232, in process
    block = _parser.parse()
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/parser.py", line 52, in parse
    block.append(self.parseExpr())
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/parser.py", line 91, in parseExpr
    return self.parseExpr()
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/parser.py", line 95, in parseExpr
    return getattr(self, funcName)()
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/parser.py", line 363, in parseTag
    block = self.block()
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/parser.py", line 273, in block
    block.append(self.parseExpr())
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/parser.py", line 95, in parseExpr
    return getattr(self, funcName)()
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/parser.py", line 188, in parseConditional
    node.block = self.block()
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/parser.py", line 273, in block
    block.append(self.parseExpr())
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/parser.py", line 95, in parseExpr
    return getattr(self, funcName)()
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/parser.py", line 363, in parseTag
    block = self.block()
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/parser.py", line 273, in block
    block.append(self.parseExpr())
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/parser.py", line 95, in parseExpr
    return getattr(self, funcName)()
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/parser.py", line 354, in parseTag
    while 'newline' == self.peek().type:
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/parser.py", line 35, in peek
    p = self.lookahead(1)
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/parser.py", line 42, in lookahead
    return self.lexer.lookahead(n)
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/lexer.py", line 139, in lookahead
    self.stash.append(self.next())
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/lexer.py", line 715, in next
    or self.string()
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/lexer.py", line 367, in string
    return self.scanInlineProcess(self.RE_STRING, 'string')
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/lexer.py", line 357, in scanInlineProcess
    toks = self.scanInline(regexp, type_)
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/lexer.py", line 348, in scanInline
    ret = self.processInline(ret.val)
  File "/home/ewen/.local/lib/python3.6/site-packages/pypugjs/lexer.py", line 308, in processInline
    start_inline = self.RE_INLINE.search(sval_replaced).start()
AttributeError: 'NoneType' object has no attribute 'start'

[kakulukia]

Maybe thats not even supported by the current lexer .. tho totally valid i bet its not expecting that :(