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Updated "onerror" docs to current situation

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ceriel 1987-04-14 16:02:37 +00:00
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doc/LLgen/LLgen.n
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@ -653,13 +653,17 @@ token.
The user may also supply his own error recovery routines, or handle The user may also supply his own error recovery routines, or handle
errors differently. For this purpose, the name of a routine to be called errors differently. For this purpose, the name of a routine to be called
when an error occurs may be declared using the keyword \fB%onerror\fR. when an error occurs may be declared using the keyword \fB%onerror\fR.
This routine takes one parameter, which is either the token number of the This routine takes two parameters.
The first one is either the token number of the
token expected, or 0. In the last case, the error occurred at a choice. token expected, or 0. In the last case, the error occurred at a choice.
In both cases, the routine must ensure that the next call to the lexical In both cases, the routine must ensure that the next call to the lexical
analyser returns the token that replaces the current one. Of course, analyser returns the token that replaces the current one. Of course,
that could well be the current one, in which case that could well be the current one, in which case
.I LLparse .I LLparse
recovers from the error. recovers from the error.
The second parameter contains a list of tokens that are not skipped at the
error point. The list is in the form of a null-terminated array of integers,
whose address is passed.
.PP .PP
The user must supply a lexical analyzer to read the input stream and The user must supply a lexical analyzer to read the input stream and
break it up into tokens, which are passed to break it up into tokens, which are passed to