| Article 7405 of comp.graphics: | |
| Path: | icdoc!zmact61 |
| >From: | zmact61@doc.ic.ac.uk (D Spinellis) |
| Newsgroups: | comp.graphics |
| Subject: | Re: YACC grammar for HPGL wanted (please) |
| Summary: | Yacc is an overkill |
| Keywords: | YACC, HPGL, grammar |
| Message-ID: | <1630@gould.doc.ic.ac.uk> |
| Date: | 26 Feb 90 14:37:17 GMT |
| References: | <1239@acadch.UUCP> |
| Sender: | news@doc.ic.ac.uk |
| Reply-To: | dds@cc.ic.ac.uk (Diomidis Spinellis) |
| Organization: | Imperial College Department of Computing |
| Lines: | 36 |
| Content-Length: | 1250 |
In article <1239@acadch.UUCP> jeremy@acadch.UUCP (Jeremy Tammik) writes: >could somebody please send me a Yacc grammar for the HPGL >plotter language? Thank you! /* Commands needing 0, 1, 2 and 4 arguments */ %token tCOM0 tCOM1 tCOM2 tCOM4 %token tTERMINATOR tARG %start command_file %% command_file : /* Empty */ | command_file command ; command : tCOM0 tTERMINATOR | tCOM1 tARG tTERMINATOR | tCOM2 tARG tARG tTERMINATOR | tCOM4 tARG tARG tARG tARG tTERMINATOR ; %% >Hints on using it efficiently >to parse & convert & understand HPGL would also be appreciated. DON'T USE IT. HPGL can be parsed very easily by a finite state machine. Using yacc to parse it is an overkill. All commands are two characters long and are terminated by a special character. You can determine the number of arguments a command uses by counting argument separators until you encounter the command terminator. Diomidis -- Diomidis Spinellis Internet: dds@cc.ic.ac.uk Department of Computing UUCP: ...!ukc!iccc!dds Imperial College JANET: dds@uk.ac.ic.cc London SW7 2BZ #include "/dev/tty"
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