amber@dartvax.UUCP (11/07/83)
I realize that trying to get YACC to handle errors gracefully is difficult, but that sort of thing makes the world go around. So.... Is there any way to get at the token that YACC dies on, resulting in the error recovery? The 'error' operator in YACC will scan off tokens until it recovers and I'd like to get at the first token it scanned off to see why it died. Any suggestions would be appreciated. -David Kovar ...decvax!dartvax!amber
jay@rochester.UUCP (Jay Weber) (11/08/83)
When an error is detected, the yacc variable "yychar" will be set
to the lookahead token number. For character tokens like ';', the
token number will be the integer value corresponding to it, but
if it is a declared token then you will have to come up with a
cross-reference table if you want what the token is in english.
Jay Weber
{..!seismo!rochester!jay, jay@rochester.arpa}davidk@dartvax.UUCP (David C. Kovar) (04/27/84)
Is there any way in YACC to push a token back onto the input
stream? Here's my problem:
In Dartmouth Basic, arrays and function calls look
alike. They are all <identifier> ( <expression ).
I'd like to scan of the identifier, look it up in the symbol
table and then decide what action to take. If I am looking
for an array identifier and I find a function identifier
I want to push it back and let it get caught later. For
various reasons I can't determine which it is in the lexical
scanner and then return the appropriate token there. Any
suggestions at all would be appreciated.
--
David C. Kovar
USNET: {linus|decvax|cornell}!dartvax!davidk
ARPA: davidk%dartmouth@csnet-relay
CSNET: davidk@dartmouth
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