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| ID | Category | Severity | Type | Date Submitted | Last Update | |||||||
| 0000517 | [1003.1(2008)/Issue 7] Shell and Utilities | Objection | Enhancement Request | 2011-11-25 17:08 | 2012-08-29 16:27 | |||||||
| Reporter | Love4Boobies | View Status | public | |||||||||
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| Priority | normal | Resolution | Open | |||||||||
| Status | New | |||||||||||
| Name | Bogdan Barbu | |||||||||||
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| Section | (section number or name, can be interface name) | |||||||||||
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| Interp Status | --- | |||||||||||
| Final Accepted Text | ||||||||||||
| Summary | 0000517: EBNF support | |||||||||||
| Description |
It would be nice if yacc supported EBNF rather than BNF, as 1. It makes it much easier to express certain things. 2. EBNF is backwards compatible with BNF. |
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| Desired Action | EBNF has been standardized as ISO/IEC 14977:1999(E). POSIX could merely link to that document. | |||||||||||
| Tags | No tags attached. | |||||||||||
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Notes |
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(0001059) joerg (reporter) 2011-11-28 15:26 |
Could you please list the new features you have in mind? The current UNIX yacc implementation can be found e.g. at: http://hg.berlios.de/repos/schillix-on/file/8989017b87c0/usr/src/cmd/sgs/yacc [^] and it seems to make sense to understand how much code needs to be changed. |
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(0001062) Love4Boobies (reporter) 2011-11-28 16:52 |
The official standard documents both the differences between BNF and EBNF and has a list of advantages that EBNF brings. I forgot to mention this, but it can be downloaded for free from ISO's website: http://standards.iso.org/ittf/PubliclyAvailableStandards/s026153_ISO_IEC_14977_1996(E).zip [^] Note that since EBNF cannot express anything that BNF can't, the code that generates the parser shouldn't really require any changes (mine didn't). |
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Issue History |
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| Date Modified | Username | Field | Change |
| 2011-11-25 17:08 | Love4Boobies | New Issue | |
| 2011-11-25 17:08 | Love4Boobies | Name | => Bogdan Barbu |
| 2011-11-25 17:08 | Love4Boobies | URL | => http://pubs.opengroup.org/onlinepubs/9699919799/utilities/yacc.html [^] |
| 2011-11-25 17:08 | Love4Boobies | Section | => (section number or name, can be interface name) |
| 2011-11-28 15:26 | joerg | Note Added: 0001059 | |
| 2011-11-28 16:52 | Love4Boobies | Note Added: 0001062 | |
| 2012-08-29 16:27 | msbrown | Project | Online Pubs => 1003.1(2008)/Issue 7 |
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