Ошибка gnuradio: найден символ "%", который не может запустить токен - PullRequest
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Ошибка gnuradio: найден символ "%", который не может запустить токен

1 голос
/ 09 апреля 2020

Я получаю эту ошибку при запуске GNU Radio Companion. Конечно, блок multi_rtl_source.block.yml не работает и не отображается в меню: 

    ERROR:gnuradio.grc.core.platform:Error while loading /usr/local/share/gnuradio/grc/blocks/multi_rtl_source.block.yml
Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/gnuradio/grc/core/platform.py", line 169, in build_library
    data = cache.get_or_load(file_path)
  File "/usr/lib/python3.8/site-packages/gnuradio/grc/core/cache.py", line 66, in get_or_load
    data = yaml.safe_load(fp)
  File "/usr/lib/python3.8/site-packages/yaml/__init__.py", line 162, in safe_load
    return load(stream, SafeLoader)
  File "/usr/lib/python3.8/site-packages/yaml/__init__.py", line 114, in load
    return loader.get_single_data()
  File "/usr/lib/python3.8/site-packages/yaml/constructor.py", line 49, in get_single_data
    node = self.get_single_node()
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 36, in get_single_node
    document = self.compose_document()
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 55, in compose_document
    node = self.compose_node(None, None)
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 133, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 82, in compose_node
    node = self.compose_sequence_node(anchor)
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 111, in compose_sequence_node
    node.value.append(self.compose_node(node, index))
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 127, in compose_mapping_node
    while not self.check_event(MappingEndEvent):
  File "/usr/lib/python3.8/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
  File "/usr/lib/python3.8/site-packages/yaml/parser.py", line 428, in parse_block_mapping_key
    if self.check_token(KeyToken):
  File "/usr/lib/python3.8/site-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/usr/lib/python3.8/site-packages/yaml/scanner.py", line 258, in fetch_more_tokens
    raise ScannerError("while scanning for the next token", None,
yaml.scanner.ScannerError: while scanning for the next token
found character '%' that cannot start any token
  in "/usr/local/share/gnuradio/grc/blocks/multi_rtl_source.block.yml", line 33, column 5
ERROR:gnuradio.grc.core.platform:while scanning for the next token
found character '%' that cannot start any token
  in "/usr/local/share/gnuradio/grc/blocks/multi_rtl_source.block.yml", line 33, column 5
Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/gnuradio/grc/core/platform.py", line 169, in build_library
    data = cache.get_or_load(file_path)
  File "/usr/lib/python3.8/site-packages/gnuradio/grc/core/cache.py", line 66, in get_or_load
    data = yaml.safe_load(fp)
  File "/usr/lib/python3.8/site-packages/yaml/__init__.py", line 162, in safe_load
    return load(stream, SafeLoader)
  File "/usr/lib/python3.8/site-packages/yaml/__init__.py", line 114, in load
    return loader.get_single_data()
  File "/usr/lib/python3.8/site-packages/yaml/constructor.py", line 49, in get_single_data
    node = self.get_single_node()
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 36, in get_single_node
    document = self.compose_document()
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 55, in compose_document
    node = self.compose_node(None, None)
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 133, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 82, in compose_node
    node = self.compose_sequence_node(anchor)
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 111, in compose_sequence_node
    node.value.append(self.compose_node(node, index))
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
  File "/usr/lib/python3.8/site-packages/yaml/composer.py", line 127, in compose_mapping_node
    while not self.check_event(MappingEndEvent):
  File "/usr/lib/python3.8/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
  File "/usr/lib/python3.8/site-packages/yaml/parser.py", line 428, in parse_block_mapping_key
    if self.check_token(KeyToken):
  File "/usr/lib/python3.8/site-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/usr/lib/python3.8/site-packages/yaml/scanner.py", line 258, in fetch_more_tokens
    raise ScannerError("while scanning for the next token", None,
yaml.scanner.ScannerError: while scanning for the next token
found character '%' that cannot start any token
  in "/usr/local/share/gnuradio/grc/blocks/multi_rtl_source.block.yml", line 33, column 5

Я также получаю это: 

>>> Check: /usr/local/share/gnuradio/grc/blocks/multi_rtl_source.block.yml
>>> FlowGraph Error: while scanning for the next token
found character '%' that cannot start any token
  in "/usr/local/share/gnuradio/grc/blocks/multi_rtl_source.block.yml", line 33, column 5

Есть Директива YAML в строке 33, столбец 5: 

-   id: sync_gain0
    label: Ch0: Sync RF Gain (dB)
    category: Synchronization
    dtype: real
    default: 10
    hide: \\
    %if nchan() > n: <== line 33
part
    %else:
all
   %endif

полный код multi_rtl_source.block.yml можно найти здесь

Статья в вики-сайте GNU Radio, в котором написано, что вы можете размещать YIX-матрицы в блоках GR C. Так откуда эта ошибка и как ее исправить?

1 Ответ

1 голос
/ 10 апреля 2020 
    hide: \\

В YAML правильный способ иметь многострочную строку - использовать спецификаторы > или | (см. https://yaml-multiline.info/), а не \\ Например, 

    hide: |

В качестве альтернативы вы можете написать условие скрытия в одну строку, например, 

    hide: ${'part' if nchan > 0 else 'all'}

А вот как это исправить в gen_multi_rtl_block.py

@@ -104,57 +100,32 @@ template_p = """\
     category: Synchronization
     dtype: real
     default: 10
-    hide: &
-    ${"%"} if nchan() > n:
-part
-    ${"%"} else:
-all
-    ${"%"} endif
+    hide: ${'$'}{'part' if nchan > ${n} else 'all'}
...