[antlr-interest] C codegen change request: Expose TokenNames array

[Brent Yates]

Jim,

I would like to request a minor addition to the C codegen string template.
I would like the generated parser code to expose the TokenNames array.
Currently this array can only be accessed from actions in the rule code.  I
would like to be able to get to it via a straight C function call external
to a parser instance.  The reason I need this is for diagnostic display.  In
addition to retrieving a pointer to the array, I need to know the size of
the array.

Currently I modify the C.stg file and add the following lines:

This block is placed just after the context structure generation in the
header section (around line 692).

<if(PARSER)>
// Returns a pointer to the TokenNames array
ANTLR3_API pANTLR3_UINT8* <name>TokenNamesArray();
// Returns the number of elements in the TokenNames array
ANTLR3_API ANTLR3_UINT32 <name>TokenNamesArraySize();
<endif>

This block is placed just after the getTokenNames function code (around line
1395).

<if(PARSER)>
// Returns a pointer to the TokenNames array
pANTLR3_UINT8* <name>TokenNamesArray()
    {
    return(<grammar.composite.rootGrammar.recognizerName>TokenNames);
    }
// Returns the number of elements in the TokenNames array
ANTLR3_UINT32 <name>TokenNamesArraySize()
    {
    return(<length(tokenNames)>+4);
    }
<endif>

Thanks!

Brent Yates
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