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Grammar Logging Callback Function

Reference Number: AA-01048 Views: 1780 0 Rating/ Voters

The callback function is called by the LVGrammar interface when an error or warning is generated during the processing of a grammar.

  • typedef void (*GrammarLogCB)(const char* message, int error_level, void* user_data)

Parameters

error_level

The types of errors which can be passed through the callback via the error_level parameter are:

  • LV_GRAMMAR_LOADING_ERROR -- the grammar could not be loaded from the location provided.
  • LV_GRAMMAR_SYNTAX_ERROR -- one or more rules or statements in the grammar was badly formed.
  • LV_GRAMMAR_SYNTAX_WARNING -- one or more statements in the grammar were either missing, or not strictly conforming to specifications, but the grammar handler was able to recover.

message

Provides more detailed information concerning error_level.

user_data

A pointer to a user-defined class or function which can customize behaviour when the LVGrammar interface sends logging messages through the callback.

See Also