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+--------+-------------------------+-------------------------+--------+--------+
|00000000| 6f 63 63 61 6d 2f 00 00 | 00 00 00 00 00 00 00 00 |occam/..|........|
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|00000400| 3d 3d 3d 20 6f 63 63 61 | 6d 2e 73 68 61 72 20 3d |=== occa|m.shar =|
|00000410| 3d 3d 3d 3d 3d 3d 3d 3d | 3d 3d 3d 3d 3d 3d 3d 3d |========|========|
|00000420| 3d 3d 3d 3d 3d 3d 3d 3d | 0a 46 72 6f 6d 20 72 69 |========|.From ri|
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|00000440| 2d 77 69 6e 6b 65 6e 21 | 75 75 6e 65 74 21 61 6c |-winken!|uunet!al|
|00000450| 6c 62 65 72 79 20 4d 6f | 6e 20 41 75 67 20 31 34 |lbery Mo|n Aug 14|
|00000460| 20 30 39 3a 35 31 3a 35 | 34 20 50 44 54 20 31 39 | 09:51:5|4 PDT 19|
|00000470| 38 39 0a 0a 50 6f 73 74 | 69 6e 67 2d 6e 75 6d 62 |89..Post|ing-numb|
|00000480| 65 72 3a 20 56 6f 6c 75 | 6d 65 20 37 2c 20 49 73 |er: Volu|me 7, Is|
|00000490| 73 75 65 20 31 32 35 0a | 53 75 62 6d 69 74 74 65 |sue 125.|Submitte|
|000004a0| 64 2d 62 79 3a 20 70 6a | 6d 70 40 68 72 63 36 33 |d-by: pj|mp@hrc63|
|000004b0| 2e 75 75 63 70 20 28 50 | 65 74 65 72 20 50 6f 6c |.uucp (P|eter Pol|
|000004c0| 6b 69 6e 67 68 6f 72 6e | 65 29 0a 41 72 63 68 69 |kinghorn|e).Archi|
|000004d0| 76 65 2d 6e 61 6d 65 3a | 20 6f 63 63 61 6d 2e 79 |ve-name:| occam.y|
|000004e0| 61 63 63 0a 0a 5b 57 68 | 69 63 68 20 6c 65 61 76 |acc..[Wh|ich leav|
|000004f0| 65 73 20 6d 65 20 6f 6e | 6c 79 20 6f 6e 65 20 71 |es me on|ly one q|
|00000500| 75 65 73 74 69 6f 6e 3a | 20 20 77 68 61 74 20 69 |uestion:|  what i|
|00000510| 73 20 4f 43 43 41 4d 3f | 20 20 49 74 20 6c 6f 6f |s OCCAM?|  It loo|
|00000520| 6b 73 20 6c 69 6b 65 20 | 73 6f 6d 65 20 6b 69 6e |ks like |some kin|
|00000530| 64 20 6f 66 0a 72 65 61 | 6c 74 69 6d 65 20 63 6f |d of.rea|ltime co|
|00000540| 6e 74 72 6f 6c 20 6c 61 | 6e 67 75 61 67 65 20 28 |ntrol la|nguage (|
|00000550| 66 6f 72 20 4d 49 44 49 | 3f 29 2e 20 20 2b 2b 62 |for MIDI|?).  ++b|
|00000560| 73 61 5d 0a 0a 48 65 72 | 65 20 69 73 20 61 20 73 |sa]..Her|e is a s|
|00000570| 69 6d 70 6c 65 20 4f 43 | 43 41 4d 20 79 61 63 63 |imple OC|CAM yacc|
|00000580| 20 73 70 65 63 69 66 69 | 63 61 74 69 6f 6e 20 77 | specifi|cation w|
|00000590| 69 74 68 20 6c 65 78 65 | 72 2e 20 4f 43 43 41 4d |ith lexe|r. OCCAM|
|000005a0| 20 26 20 4f 43 43 41 4d | 32 20 61 72 65 0a 68 61 | & OCCAM|2 are.ha|
|000005b0| 6e 64 6c 65 64 2e 20 48 | 6f 70 65 20 74 68 69 73 |ndled. H|ope this|
|000005c0| 20 69 73 20 74 68 65 20 | 72 69 67 68 74 20 6e 65 | is the |right ne|
|000005d0| 77 73 67 72 6f 75 70 2e | 20 5b 49 74 20 69 73 2e |wsgroup.| [It is.|
|000005e0| 20 20 2b 2b 62 73 61 5d | 20 20 49 74 20 69 73 20 |  ++bsa]|  It is |
|000005f0| 6e 6f 74 20 70 65 72 66 | 65 63 74 21 0a 0a 2d 2d |not perf|ect!..--|
|00000600| 2d 2d 20 43 75 74 20 48 | 65 72 65 20 61 6e 64 20 |-- Cut H|ere and |
|00000610| 75 6e 70 61 63 6b 20 2d | 2d 2d 2d 0a 00 00 00 00 |unpack -|---.....|
|00000620| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000630| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000640| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
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|000007f0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000800| 6f 63 63 61 6d 2f 52 45 | 41 44 4d 45 00 00 00 00 |occam/RE|ADME....|
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|000009b0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
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|000009f0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000a00| 0a 54 68 65 73 65 20 61 | 72 65 20 74 77 6f 20 4f |.These a|re two O|
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|00000a60| 61 73 20 64 65 76 65 6c | 6f 70 65 64 20 61 73 20 |as devel|oped as |
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|00000a80| 72 6e 69 6e 67 20 65 78 | 65 72 63 69 73 65 2e 0a |rning ex|ercise..|
|00000a90| 54 68 65 20 6f 6e 65 20 | 66 6f 72 20 4f 63 63 61 |The one |for Occa|
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|00000ab0| 2e 20 54 68 65 20 6f 6e | 65 20 66 6f 72 20 4f 63 |. The on|e for Oc|
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|00000b10| 65 20 74 68 65 20 4f 63 | 63 61 6d 32 20 64 65 66 |e the Oc|cam2 def|
|00000b20| 69 6e 69 74 69 6f 6e 20 | 69 73 20 61 0a 72 61 74 |inition |is a.rat|
|00000b30| 68 65 72 20 75 6e 73 75 | 69 74 65 64 20 66 6f 72 |her unsu|ited for|
|00000b40| 20 79 61 63 63 2c 20 61 | 73 20 64 65 66 69 6e 65 | yacc, a|s define|
|00000b50| 64 20 62 79 20 74 68 65 | 20 4f 63 63 61 6d 32 20 |d by the| Occam2 |
|00000b60| 4c 61 6e 67 75 61 67 65 | 20 64 65 66 69 6e 69 74 |Language| definit|
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|00000b80| 2e 0a 0a 54 68 65 20 6d | 6f 73 74 20 6f 72 69 67 |...The m|ost orig|
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|00000ba0| 73 20 69 73 20 74 68 65 | 20 6c 65 78 20 72 6f 75 |s is the| lex rou|
|00000bb0| 74 69 6e 65 73 20 77 68 | 69 63 68 20 64 65 61 6c |tines wh|ich deal|
|00000bc0| 20 77 69 74 68 20 4f 63 | 63 61 6d 27 73 0a 69 6e | with Oc|cam's.in|
|00000bd0| 64 65 6e 74 61 74 69 6f | 6e 20 66 65 61 74 75 72 |dentatio|n featur|
|00000be0| 65 73 2e 20 54 68 65 73 | 65 20 72 65 63 6f 67 6e |es. Thes|e recogn|
|00000bf0| 69 73 65 72 73 20 61 72 | 65 20 6f 66 66 65 72 65 |isers ar|e offere|
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|00000c40| 61 6d 20 6c 65 78 20 26 | 20 79 61 63 63 20 64 65 |am lex &| yacc de|
|00000c50| 66 69 6e 69 74 69 6f 6e | 2e 0a 0a 54 6f 20 62 75 |finition|...To bu|
|00000c60| 69 6c 64 20 61 20 63 6f | 6d 70 69 6c 65 72 20 66 |ild a co|mpiler f|
|00000c70| 72 6f 6d 20 74 68 69 73 | 20 72 65 71 75 69 72 65 |rom this| require|
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|00000ca0| 65 0a 66 69 6e 64 73 20 | 74 68 69 73 20 75 73 65 |e.finds |this use|
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|00000ce0| 63 65 20 49 20 61 6d 0a | 70 6c 61 63 69 6e 67 20 |ce I am.|placing |
|00000cf0| 74 68 69 73 20 69 6e 20 | 74 68 65 20 70 75 62 6c |this in |the publ|
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|00000d20| 44 4d 45 09 09 2d 20 74 | 68 69 73 20 66 69 6c 65 |DME..- t|his file|
|00000d30| 21 0a 4d 61 6b 65 66 69 | 6c 65 09 2d 20 73 69 6d |!.Makefi|le.- sim|
|00000d40| 70 6c 65 20 55 4e 49 58 | 20 6d 61 6b 65 66 69 6c |ple UNIX| makefil|
|00000d50| 65 0a 0a 6f 63 63 61 6d | 2e 79 09 09 2d 20 4f 63 |e..occam|.y..- Oc|
|00000d60| 63 61 6d 20 79 61 63 63 | 20 73 70 65 63 69 66 69 |cam yacc| specifi|
|00000d70| 63 61 74 69 6f 6e 0a 6f | 63 63 61 6d 6c 65 78 2e |cation.o|ccamlex.|
|00000d80| 63 09 2d 20 4f 63 63 61 | 6d 20 6c 65 78 65 72 0a |c.- Occa|m lexer.|
|00000d90| 0a 6f 63 63 61 6d 32 2e | 79 09 2d 20 4f 63 63 61 |.occam2.|y.- Occa|
|00000da0| 6d 32 20 79 61 63 63 20 | 73 70 65 63 69 66 69 63 |m2 yacc |specific|
|00000db0| 61 74 69 6f 6e 0a 6f 63 | 63 61 6d 32 6c 65 78 2e |ation.oc|cam2lex.|
|00000dc0| 63 09 2d 20 4f 63 63 61 | 6d 32 20 6c 65 78 65 72 |c.- Occa|m2 lexer|
|00000dd0| 0a 0a 74 65 73 74 31 09 | 09 29 0a 74 65 73 74 32 |..test1.|.).test2|
|00000de0| 09 09 29 2d 20 73 65 74 | 20 6f 66 20 4f 63 63 61 |..)- set| of Occa|
|00000df0| 6d 20 74 65 73 74 20 66 | 69 6c 65 73 20 66 6f 72 |m test f|iles for|
|00000e00| 20 6f 63 63 61 6d 2e 0a | 74 65 73 74 33 09 09 29 | occam..|test3..)|
|00000e10| 0a 74 65 73 74 34 09 09 | 29 0a 0a 48 61 76 65 20 |.test4..|)..Have |
|00000e20| 66 75 6e 21 0a 0a 50 65 | 74 65 72 20 50 6f 6c 6b |fun!..Pe|ter Polk|
|00000e30| 69 6e 67 68 6f 72 6e 65 | 20 28 20 70 6a 6d 70 40 |inghorne| ( pjmp@|
|00000e40| 75 6b 2e 63 6f 2e 67 65 | 63 2d 72 6c 2d 68 72 63 |uk.co.ge|c-rl-hrc|
|00000e50| 20 6f 72 20 2e 2e 2e 21 | 6d 63 76 61 78 21 75 6b | or ...!|mcvax!uk|
|00000e60| 63 21 68 72 63 36 33 21 | 70 6a 6d 70 20 29 0a 47 |c!hrc63!|pjmp ).G|
|00000e70| 45 43 20 48 69 72 73 74 | 20 52 65 73 65 61 72 63 |EC Hirst| Researc|
|00000e80| 68 20 43 65 6e 74 72 65 | 2c 20 45 61 73 74 20 4c |h Centre|, East L|
|00000e90| 61 6e 65 2c 20 57 65 6d | 62 6c 65 79 2c 20 4d 69 |ane, Wem|bley, Mi|
|00000ea0| 64 64 6c 65 73 65 78 2c | 20 55 4b 0a 0a 00 00 00 |ddlesex,| UK.....|
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|00001d00| 20 42 45 47 20 67 75 61 | 72 64 70 6c 69 73 74 20 | BEG gua|rdplist |
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|00003920| 3d 20 45 4f 4c 3b 0a 0a | 09 09 09 09 09 7d 20 65 |= EOL;..|.....} e|
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|00003960| 09 09 09 62 72 65 61 6b | 3b 7d 0a 0a 09 09 09 09 |...break|;}......|
|00003970| 63 61 73 65 20 27 3c 27 | 3a 20 7b 0a 09 09 09 09 |case '<'|: {.....|
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|00003990| 2b 31 5d 20 3d 3d 20 27 | 3c 27 20 29 20 7b 0a 09 |+1] == '|<' ) {..|
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|000039c0| 4f 50 3b 0a 0a 09 09 09 | 09 09 7d 20 65 6c 73 65 |OP;.....|..} else|
|000039d0| 20 7b 0a 09 09 09 09 09 | 09 69 66 20 28 20 6c 69 | {......|.if ( li|
|000039e0| 6e 65 5b 69 6e 64 65 78 | 2b 31 5d 20 3d 3d 20 27 |ne[index|+1] == '|
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|00003aa0| 29 20 7b 0a 09 09 09 09 | 09 09 69 6e 64 65 78 2b |) {.....|..index+|
|00003ab0| 3d 32 3b 0a 09 09 09 09 | 09 09 74 6f 6b 20 3d 20 |=2;.....|..tok = |
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|00003af0| 29 20 7b 0a 09 09 09 09 | 09 09 69 6e 64 65 78 2b |) {.....|..index+|
|00003b00| 3d 32 3b 0a 09 09 09 09 | 09 09 74 6f 6b 20 3d 20 |=2;.....|..tok = |
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|00003b80| 20 3d 20 43 4f 4d 50 4f | 50 3b 0a 09 09 09 09 09 | = COMPO|P;......|
|00003b90| 7d 2f 2a 69 66 2a 2f 0a | 0a 09 09 09 09 62 72 65 |}/*if*/.|.....bre|
|00003ba0| 61 6b 3b 7d 0a 0a 09 09 | 09 09 63 61 73 65 20 27 |ak;}....|..case '|
|00003bb0| 2f 27 3a 20 7b 0a 09 09 | 09 09 09 69 66 20 28 20 |/': {...|...if ( |
|00003bc0| 6c 69 6e 65 5b 69 6e 64 | 65 78 2b 31 5d 20 3d 3d |line[ind|ex+1] ==|
|00003bd0| 20 27 5c 5c 27 20 29 20 | 7b 0a 09 09 09 09 09 09 | '\\' ) |{.......|
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|00003bf0| 74 6f 6b 20 3d 20 4c 4f | 47 4f 50 3b 0a 0a 09 09 |tok = LO|GOP;....|
|00003c00| 09 09 09 7d 20 65 6c 73 | 65 20 7b 0a 09 09 09 09 |...} els|e {.....|
|00003c10| 09 09 74 6f 6b 20 3d 20 | 6c 69 6e 65 5b 69 6e 64 |..tok = |line[ind|
|00003c20| 65 78 2b 2b 5d 3b 0a 0a | 09 09 09 09 09 7d 2f 2a |ex++];..|.....}/*|
|00003c30| 69 66 2a 2f 0a 09 09 09 | 09 62 72 65 61 6b 3b 7d |if*/....|.break;}|
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|00003c50| 20 7b 0a 09 09 09 09 09 | 69 66 20 28 20 6c 69 6e | {......|if ( lin|
|00003c60| 65 5b 69 6e 64 65 78 2b | 31 5d 20 3d 3d 20 27 2f |e[index+|1] == '/|
|00003c70| 27 20 29 20 7b 0a 09 09 | 09 09 09 09 69 6e 64 65 |' ) {...|....inde|
|00003c80| 78 2b 3d 32 3b 0a 09 09 | 09 09 09 09 74 6f 6b 20 |x+=2;...|....tok |
|00003c90| 3d 20 4c 4f 47 4f 50 3b | 0a 0a 09 09 09 09 09 7d |= LOGOP;|.......}|
|00003ca0| 20 65 6c 73 65 20 7b 0a | 09 09 09 09 09 09 74 6f | else {.|......to|
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|00003d00| 28 20 6c 69 6e 65 5b 69 | 6e 64 65 78 2b 31 5d 20 |( line[i|ndex+1] |
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|00003d30| 0a 09 09 09 09 09 09 69 | 6e 64 65 78 2b 2b 3b 0a |.......i|ndex++;.|
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|00003d60| 78 5d 29 20 29 7b 0a 09 | 09 09 09 09 09 09 69 6e |x]) ){..|......in|
|00003d70| 64 65 78 2b 2b 3b 0a 09 | 09 09 09 09 09 7d 2f 2a |dex++;..|.....}/*|
|00003d80| 77 68 69 6c 65 2a 2f 0a | 0a 09 09 09 09 09 09 74 |while*/.|.......t|
|00003d90| 6f 6b 20 3d 20 4e 55 4d | 42 45 52 3b 0a 0a 09 09 |ok = NUM|BER;....|
|00003da0| 09 09 09 7d 20 65 6c 73 | 65 20 7b 0a 09 09 09 09 |...} els|e {.....|
|00003db0| 09 09 74 6f 6b 20 3d 20 | 6c 69 6e 65 5b 69 6e 64 |..tok = |line[ind|
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|00003e00| 6e 65 5b 69 6e 64 65 78 | 2b 31 5d 20 21 3d 20 27 |ne[index|+1] != '|
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|00003e30| 20 27 5c 27 27 20 29 20 | 7b 0a 0a 09 09 09 09 09 | '\'' ) |{.......|
|00003e40| 09 69 6e 64 65 78 2b 3d | 33 3b 0a 09 09 09 09 09 |.index+=|3;......|
|00003e50| 09 74 6f 6b 20 3d 20 43 | 48 43 4f 4e 3b 0a 0a 09 |.tok = C|HCON;...|
|00003e60| 09 09 09 09 7d 20 65 6c | 73 65 20 69 66 20 28 20 |....} el|se if ( |
|00003e70| 6c 69 6e 65 5b 69 6e 64 | 65 78 2b 31 5d 20 3d 3d |line[ind|ex+1] ==|
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|00003e90| 26 20 6c 69 6e 65 5b 69 | 6e 64 65 78 2b 32 5d 20 |& line[i|ndex+2] |
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|00003f30| 78 2b 32 5d 20 3d 3d 20 | 27 23 27 20 0a 09 09 09 |x+2] == |'#' ....|
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|00003fb0| 7b 0a 0a 09 09 09 09 09 | 09 69 6e 64 65 78 2b 3d |{.......|.index+=|
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|00004000| 0a 09 09 09 09 09 7d 2f | 2a 69 66 2a 2f 0a 0a 09 |......}/|*if*/...|
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|00004100| 20 7b 0a 09 09 09 09 09 | 09 74 6f 6b 20 3d 20 6c | {......|.tok = l|
|00004110| 69 6e 65 5b 69 6e 64 65 | 78 2b 2b 5d 3b 0a 0a 09 |ine[inde|x++];...|
|00004120| 09 09 09 09 7d 2f 2a 69 | 66 2a 2f 0a 0a 09 09 09 |....}/*i|f*/.....|
|00004130| 09 62 72 65 61 6b 3b 7d | 0a 0a 2f 2a 20 64 6f 20 |.break;}|../* do |
|00004140| 65 78 74 72 61 20 6c 6f | 6f 6b 20 61 68 65 61 64 |extra lo|ok ahead|
|00004150| 20 74 68 61 74 20 79 61 | 63 63 20 63 61 6e 20 6e | that ya|cc can n|
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|000041d0| 09 09 09 09 09 6c 69 6e | 64 65 78 2b 2b 3b 0a 09 |.....lin|dex++;..|
|000041e0| 09 09 09 09 7d 2f 2a 77 | 68 69 6c 65 2a 2f 0a 0a |....}/*w|hile*/..|
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|000044d0| 7c 20 6c 69 6e 65 5b 69 | 6e 64 65 78 5d 20 3d 3d || line[i|ndex] ==|
|000044e0| 20 27 2e 27 20 29 7b 0a | 09 09 09 09 09 09 09 77 | '.' ){.|.......w|
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