David Majda 86769a6c5c Error handling: Make |?| return |null| on unsuccessful match ... Before this commit, the |?| operator returned an empty string upon unsuccessful match. This commit changes the returned value to |null|. It also updates the PEG.js grammar and the example grammars, which used the value returned by |?| quite often. Returning |null| is possible because it no longer indicates a match failure. I expect that this change will simplify many real-world grammars, as an empty string is almost never desirable as a return value (except some lexer-level rules) and it is often translated into |null| or some other value in action code. Implements part of #198.		2013-12-01 16:12:35 +01:00
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passes	Error handling: Make |?| return |null| on unsuccessful match	2013-12-01 16:12:35 +01:00
opcodes.js	Code generator rewrite	2013-01-01 16:38:09 +01:00