Reusing ANTLR3 lexer and parser

Question

I create an input stream from a string with

pANTLR3_UINT8 input_string = (pANTLR3_UINT8) "test"; pANTLR3_INPUT_STREAM stream = antlr3StringStreamNew(input_string, ANTLR3_ENC_8BIT, sizeof(input_string), (pANTLR3_UINT8)"testname");

and then use my lexer and parser to process the string. When I'm done with this string I want to process a new one, but re-creating the lexer and parser objects seems inefficient.

I've found the reset method of the lexer and parser classes and the reuse method of the stream, but how do I use those to parse a new string?

sarnold · Accepted Answer · 2011-12-06 09:23:23Z

1

I believe what you're looking for is the setCharStream() function.

answered Dec 6, 2011 at 9:23

sarnold

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2 Comments

rickythefox Over a year ago

Do I also need to call reset on the lexer/parser/stream? Would you mind providing a short example?

sarnold Over a year ago

You shouldn't need to call reset() manually; the C version resets most of the internal variables (and comments near calls to setCharStream() mention resetting the state). (The Java version calls reset() explicitly, too.) You should just be able to create a new pANTLR3_INPUT_STREAM for your new stream and reset with setCharStream(lexer, new_stream), constructing the stream as you've already done.

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