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by Zababa
1760 days ago
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That's not true. You can have a LL or LR grammar, and use a hand-written parser to get better speed, better error reporting, any number of reasons really. Java is LL(1), but javac seem to use a hand-written recursive descent parser. Now that I think about it, Java being omitted is weird. |
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Java hasn't ever been able to be parsed with one token look ahead, the earlier versions had a section on how to modify the grammar to be LALR(1)[0] but it was dropped in later versions of the specification -- probably due to added features which made it unfeasible like generic classes.
It's actually quite a good resource since they explain the reasons why the parser needs to have more than one token to figure out what's going on.
[0] http://titanium.cs.berkeley.edu/doc/java-langspec-1.0/19.doc...