Error replicating example from the docs

[Jordi Altayó]

I am trying to run the example from the docs https://pyvhdlparser.readthedocs.io/en/latest/BlockStream/Usage.html
And I get an NoneType is not iterable error.

here is my code

from pyVHDLParser.Token.Parser      import Tokenizer
from pyVHDLParser.Blocks            import TokenToBlockParser
from pyVHDLParser.Base              import ParserException


# Open a source file
with open('strobe_analyzer.vhd', 'r') as fileHandle:
  content = fileHandle.read()


# get a token generator
tokenStream = Tokenizer.GetVHDLTokenizer(content)
# get a block generator
blockStream = TokenToBlockParser.Transform(tokenStream)

try:
  for block in blockStream:
    print("{block!s}".format(block=block))
    for token in block:
      print("  {token!s}".format(token=token))
except ParserException as ex:
  print("ERROR: {0!s}".format(ex))
except NotImplementedError as ex:
  print("NotImplementedError: {0!s}".format(ex))

and you can see the vhdl file I am using to test this attetched (just change the extension to vhd, stupid github issue woudltn let me upload .vhd files.....)
strobe_analyzer.txt

[Patrick Lehmann]

Can you please attache the error message and stacktrace? This would help a lot.

What Python version are you using?

[Jordi Altayó]

error trace

C:\Users\Jordi\AppData\Local\Programs\Python\Python38\python.exe C:/Users/Jordi/PycharmProjects/untitled1/parser_test.py
Traceback (most recent call last):
  File "C:/Users/Jordi/PycharmProjects/untitled1/parser_test.py", line 18, in <module>
    for block in blockStream:
  <StartOfDocumentToken>
  File "C:\Users\Jordi\AppData\Local\Programs\Python\Python38\lib\site-packages\pyVHDLParser\Blocks\__init__.py", line 193, in GetGenerator
    self.NextState(self)
  File "C:\Users\Jordi\AppData\Local\Programs\Python\Python38\lib\site-packages\pyVHDLParser\Blocks\__init__.py", line 426, in stateDocument
    for keyword in cls.KEYWORDS:
TypeError: 'NoneType' object is not iterable            

the python version is 3.8.1

I have also checked if it works with the code you have in the documentatino and it produces the same error

[Jordi Altayó]

I have tried in a linux machine and the result is the same, just FYI

[Simon Buhrow]

I´ve got the same error.

When inserting the following code block to the code of https://pyvhdlparser.readthedocs.io/en/latest/BlockStream/Usage.html (before the try-block) it runs.

from pyVHDLParser.Blocks            import MetaBlock
for block in MetaBlock.BLOCKS:
        try:
            block.__cls_init__()
        except AttributeError:
            pass

It is copied from unit/__init__.py where the comment says:

XXX: move to pyVHDLParser.Blocks; call it from frontend

So I think this has to be done to run the code without the above mentioned code block, i.e. to solve this issue in a clean way.

By the way. It runs but throws an other error after some blocks:

ERROR: Expected ';', ':=' or whitespace after subtype indication.

Which belongs to #9 .

[Jordi Altayó]

I think that the syntax error is because you are not using python 3.8 version

[Simon Buhrow]

I don´t think so as I´m using python 3.8.2 version.

[Brandon-Valley]

I had the same issue, just for anyone else, this is what worked for me:

vhdl_file_path = "RELATIVE_PATH_TO_YOUR_VHDL_FILE"

# Open a source file
with open(vhdl_file_path, 'r') as fileHandle:
    content = fileHandle.read()


from pyVHDLParser.Token.Parser      import Tokenizer
from pyVHDLParser.Blocks            import TokenToBlockParser
from pyVHDLParser.Base              import ParserException

# get a token generator
tokenStream = Tokenizer.GetVHDLTokenizer(content)
# get a block generator
blockStream = TokenToBlockParser.Transform(tokenStream)

from pyVHDLParser.Blocks            import MetaBlock
for block in MetaBlock.BLOCKS:
        try:
            block.__cls_init__()
        except AttributeError:
            pass
try:
    for block in blockStream:
        print("{block!s}".format(block=block))
    for token in block:
        print("  {token!s}".format(token=token))
except ParserException as ex:
    print("ERROR: {0!s}".format(ex))
except NotImplementedError as ex:
    print("NotImplementedError: {0!s}".format(ex))    

[Patrick Lehmann]

This tool is still in alpha state. I want to implement the 2 missing main features in my Christmas holidays.

[Brandon-Valley]

@Paebbels Thank you very much for your support!

[Patrick Lehmann]

The project contains now >250 test cases and reaches circa 48% branch coverage. More tests are coming ...
Besides simple tests (individual syntax tests), more complicated real world tests will be added soon.

When this works, I can add issue testcases, this means an minimal failing example can added to the test suite for regression testing.