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| From | anton@mips.complang.tuwien.ac.at (Anton Ertl) |
| Newsgroups | comp.compilers |
| Subject | Re: precedences vs. hierarchy |
| Date | Wed, 08 Jun 2016 09:48:49 GMT |
| Organization | Institut fuer Computersprachen, Technische Universitaet Wien |
| Lines | 21 |
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| Message-ID | <16-06-010@comp.compilers> (permalink) |
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| Keywords | parse |
| Posted-Date | 10 Jun 2016 22:23:21 EDT |
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Kaz Kylheku <545-066-4921@kylheku.com> writes: >You need the concept of associativity to tell whether >A + B + C is (A + B) + C or A + (B + C). But if + is really associative (e.g., not FP addition), these two are equivalent. >In table shift-reduce parsers (Yacc, and such), associativity rules >resolve conflicts. Of course, you can also write the grammar in an unambiguous way, then you don't need associativity rules to resolve the ambiguity; a disadvantage of precedence and associativity declarations is that they can hide more ambiguities than you intended. - anton -- M. Anton Ertl anton@mips.complang.tuwien.ac.at http://www.complang.tuwien.ac.at/anton/
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precedences vs. hierarchy Andreas Schramm <bassobajo@gmail.com> - 2016-06-06 09:08 +0200
Re: precedences vs. hierarchy "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> - 2016-06-06 17:08 +0200
Re: precedences vs. hierarchy Kaz Kylheku <545-066-4921@kylheku.com> - 2016-06-07 15:35 +0000
Re: precedences vs. hierarchy "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> - 2016-06-07 22:53 +0200
Re: precedences vs. hierarchy anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-06-08 09:48 +0000
Re: precedences vs. hierarchy George Neuner <gneuner2@comcast.net> - 2016-06-06 12:35 -0400
Re: precedences vs. hierarchy federation2005@netzero.com - 2016-06-06 14:01 -0700
Example: The Full Syntax Of Prolog (Re: precedences vs. hierarchy) rockbrentwood@gmail.com - 2016-08-24 15:45 -0700
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