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Tasks related to input processing

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Accessing the Current Token

This module provides a function GetCurrTok that can be used to access the string of the current token read from input. The function is used for example to access the name of a file to be included if the switching computation is issued by the parser as specified in the concrete grammar.

This module is instantiated without generic parameters by


The signature of the function is

char *GetCurrTok (void)
It accesses the string of the current token, stores it in memory, and yields a pointer to the stored string as result.

In our running example we could achieve the same effect of file inclusion as described in (see Insert a File into the Input Stream), by specifying a computation in the concrete grammar rather than in a .lido specification:

   Declaration: 'include' 
                &'ChkFileOpnd(NewInput(GetCurrTok()), GetCurrTok());' 
                FileName ';'.
The token of FileName that immediatly follows the computation is accessed. The call of ChkFileOpnd is assumed to check for success of the NewInput call.

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