Add missing |named| case to the visitor in lib/compiler/asts.js, which
makes the infinite loop and left recursion detectors work correctly with
named rules.
The missing case caused |make parser| to fail with:
140:34: Infinite loop detected.
make: *** [parser] Error 1
Beside the recursion detector, the visitor will also be used by infinite
loop detector.
Note the newly created |asts.matchesEmpty| function re-creates the
visitor each time it is called, which makes it slower than necessary.
This could have been worked around in various ways but I chose to defer
that optimization because real-world performance impact is small.
Split lib/utils.js into multiple files. Some of the functions were
generic, these were moved into files in lib/utils. Other funtions were
specific for the compiler, these were moved to files in lib/compiler.
This commit only moves functions around -- there is no renaming and
cleanup performed. Both will come later.
