Before this commit, generated parsers considered the following character
sequences as newlines:
Sequence Description
------------------------------
"\n" Unix
"\r" Old Mac
"\r\n" Windows
"\u2028" line separator
"\u2029" paragraph separator
This commit limits the sequences only to "\n" and "\r\n". The reason is
that nobody uses Unicode newlines or "\r" in practice.
A positive side effect of the change is that newline-handling code
became simpler (and likely faster).
The expectation deduplication algorithm called |Array.prototype.splice|
to eliminate each individual duplication, which was slow. This caused
problems with grammar/input combinations that generated a lot of
expecations (see #377 for an example).
This commit replaces the algorithm with much faster one, eliminating the
problem.
The |found| property wasn't very useful as it mostly contained just one
character or |null| (the exception being syntax errors triggered by
|error| or |expected|). Similarly, the "but XXX found" part of the error
message (based on the |found| property) wasn't much useful and was
redundant in presence of location info.
For these reasons, this commit removes the |found| property and
corresponding part of the error message from syntax errors. It also
modifies error location info slightly to cover a range of 0 characters,
not 1 character (except when the error is triggered by |error| or
|expected|). This corresponds more precisely to the actual situation.
Fixes#372.
David Majda