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Support for String Type in `.sym` Files

See original GitHub issue

When parsing the following .sym file:

FormatVersion=6.0 // Do not edit this line!


Sig=Signed_Int_Char char
Sig=Enum_Signal Enum1 8


Var=Variable2 string 0,64 /d:rDefaultS

where the PDM_HeartBeat symbol has a 64 bit “string” variable with default value “DefaultS”, the following error is produced:

  File "C:\Users\Gareth\.virtualenvs\Consolidated-Firmware-74Z7PhuA\lib\site-packages\", line 839, in parse
    return Grammar(self.grammar()).parse(tokens, token_tree)
  File "C:\Users\Gareth\.virtualenvs\Consolidated-Firmware-74Z7PhuA\lib\site-packages\", line 640, in parse
    raise GrammarError(tokens.peek_max().offset)
textparser.GrammarError: Invalid syntax at offset 218.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "src\shared\CanMsgs\", line 77, in <module>
  File "src\shared\CanMsgs\", line 47, in generate_code_from_sym_file
    dbase = load_file(database_name + ".sym", database_format="sym")
  File "C:\Users\Gareth\.virtualenvs\Consolidated-Firmware-74Z7PhuA\lib\site-packages\cantools\database\", line 170, in load_file
  File "C:\Users\Gareth\.virtualenvs\Consolidated-Firmware-74Z7PhuA\lib\site-packages\cantools\database\", line 238, in load
  File "C:\Users\Gareth\.virtualenvs\Consolidated-Firmware-74Z7PhuA\lib\site-packages\cantools\database\", line 305, in load_string
    return load_can_database('sym')
  File "C:\Users\Gareth\.virtualenvs\Consolidated-Firmware-74Z7PhuA\lib\site-packages\cantools\database\", line 287, in load_can_database
  File "C:\Users\Gareth\.virtualenvs\Consolidated-Firmware-74Z7PhuA\lib\site-packages\cantools\database\can\", line 198, in add_sym_string
    database = sym.load_string(string, self._strict)
  File "C:\Users\Gareth\.virtualenvs\Consolidated-Firmware-74Z7PhuA\lib\site-packages\cantools\database\can\formats\", line 578, in load_string
    tokens = Parser60().parse(string)
  File "C:\Users\Gareth\.virtualenvs\Consolidated-Firmware-74Z7PhuA\lib\site-packages\", line 841, in parse
    raise ParseError(text, e.offset)
textparser.ParseError: Invalid syntax at line 16, column 30: "Var=Variable2 string 0,64 /d:>>!<<rDefaultS"

Please let me know if you need anything else! Thanks!

Issue Analytics

  • State:closed
  • Created 5 years ago
  • Comments:6 (2 by maintainers)

github_iconTop GitHub Comments

eerimoqcommented, Jan 12, 2019

Today the type system in cantools only handles signed, unsinged and float. The type system should probably be improved, say with a type-attribute in the signal class, but as a first step I suggest representing a string with an unsigned value of a multiple of 8 bits and char as an unsigned value of length 8.

garethellis0commented, Jan 16, 2019

Confirmed that 32.6.1 produces the following:

struct CanMsgs_pdm_heart_beat_t {
     * Range: -
     * Scale: 1
     * Offset: 0
    uint64_t variable2;


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