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-3QBSTFS͸͍͍ͧ 4VOEBZ .BZ  ,FSOFM7.୳ݕୂ!ؔ੢ճ໨ !ZEBI :VEBJ5BLBEB

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XIPBNJ ߴా༤େ:VEBJ5BLBEB (JU)VCZEBI 5XJUUFSZEBI@ 4PGUXBSFFOHJOFFS $3VCZDPNNJUUFS NBJOMZEFWFMPQQBSTFSSFMBUFEGFBUVSFT "DPNNJUUFSPGSVCZMSBNB-"-3QBSTFSHFOFSBUPS $IJFGPSHBOJ[FSPG,BOTBJ3VCZ,BJHJ !ઌేொՎ෣࿅৔

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3VCZ,BJHJQIPUP IUUQTYDPN-JUUMF@3VCZJTUTUBUVT .F

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3VCZͰ͸ࠓ1BSTFS͕೤͍ 3VCZ,BJHJͰ͸͜͜೥ؒͰηογϣϯ ࠓ೥΋ηογϣϯ 3VCZʹ͸ࠓೋͭͷ1BSTFS͕ଘࡏ͍ͯ͠Δ ϑϧεΫϥονͰ࣮૷͢Δखॻ͖1BSTFS ύʔαʔδΣωϨʔλʹΑͬͯੜ੒͞ΕΔ1BSTFS ࠓ೔͸ͬͪ͜ͷ࿩

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1BSTFSͱ͸ จ๏نଇʹैͬͯهड़͞ΕͨςΩετΛղੳ͠ɺϓϩάϥϜͰѻ͑ΔΑ͏ ͳσʔλߏ଄ʹม׵͢ΔϓϩάϥϜ΍ɺͦͷॲཧΛࢦ͢ 1BSTFSͷ͓࢓ࣄ ೖྗ͞ΕͨςΩετ΍σʔλͷಡऔʢࣈ۟ղੳʣ จ๏نଇʹैͬͯղੳ ߏ଄Խ͞Εͨσʔλʢଟ͘ͷ৔߹ɺߏจ໦΍τʔΫϯྻʣʹม׵

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1BSTFSͱ-FYFS ࣈ ۟ ղ ੳ ث ߏ จ ղ ੳ ث จࣈྻ όΠτྻ τʔΫϯྻ ந৅ߏจ໦ "45

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1BSTFSͱ-FYFS ࣈ ۟ ղ ੳ ث ߏ จ ղ ੳ ث จࣈྻ όΠτྻ τʔΫϯྻ ந৅ߏจ໦ "45

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-FYFS def method_name(param) puts param end ೖྗ͸ίʔυͷจࣈྻ

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-FYFS ॲཧܥ͔ΒݟΔͱόΠτྻ จࣈͷฒͼΛղੳ͠ɺҙຯͷ͋Δ࠷খͷ୯ҐʢτʔΫϯʣʹ෼ղ͢Δ 64 65 66 20 6d 65 74 68 6f 64 5f 6e 61 6d 65 28 70 61 72 61 6d 29 0a 20 20 70 75 74 73 20 70 61 72 61 6d 0a 65 6e 64 def method_name param

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1BSTFSͱ-FYFS ࣈ ۟ ղ ੳ ث ߏ จ ղ ੳ ث จࣈྻ όΠτྻ τʔΫϯྻ ந৅ߏจ໦ "45

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1BSTFS τʔΫϯྻ͕จ๏తʹਖ਼͍͔͠Λݕࠪͯ͠ந৅ߏจ໦ "45 Λ࡞੒͢Δ def method_name(param) puts param end defn ar g s body fcall puts ar g s '(' keyword_def tIDENTIFIER tIDENTIFIER ')' ...

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1BSTFSHFOFSBUPS 構 文 解 析 器 生 成 器 จ๏ϑΝΠϧ 1BSTFS

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1BSTFSHFOFSBUPS 構 文 解 析 器 生 成 器 จ๏ϑΝΠϧ 1BSTFS

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จ๏ϑΝΠϧ #/' #BDLVTr/BVS'PSN Ͱจ๏Λهड़͢Δ #/'ͱ͸จ๏نଇΛఆٛ͢ΔͨΊͷه๏Ͱɺਓؒʹͱͬͯ௚ײతͰཧղ͠΍͍͢ expr : NUMBER { $$ = $1; } | expr '+' expr { $$ = $1 + $3; } ;

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1BSTFSHFOFSBUPS 構 文 解 析 器 生 成 器 จ๏ϑΝΠϧ 1BSTFS

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1BSTFSHFOFSBUPS ͦͷ໊ͷ௨Γ1BSTFSΛੜ੒͢ΔͨΊͷπʔϧ ղੳ͍ͨ͠ݴޠͷจ๏ఆٛΛೖྗͱͯ͠ड͚औͬͯɺͦͷจ๏ʹैͬͯߏ จղੳΛߦ͏ͨΊͷ1BSTFSͷίʔυΛॻ͖ग़͢ 3VCZͰ͸௕Β͘(/6#JTPOΛ࢖͖͍ͬͯͯͨ 3VCZ ೥݄ ͔Β͸-SBNBͱ͍͏3VCZ੡ͷ1BSTFS HFOFSBUPSʹஔ͖׵Θͬͨ

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ͳͥ#JTPOΛஔ͖׵͑ͨʁ

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#JTPOΛஔ͖׵͑ͨཧ༝ #JTPOͷWFSTJPO͸؀ڥʹΑͬͯҟͳΔͷͰෳ਺WFSTJPOͷαϙʔτ͕ඞཁ ιʔείʔυ͔ΒϏϧυ͢Δ৔߹͸ɺͦͷ؀ڥͰΠϯετʔϧ͞Ε͍ͯΔ #JTPO͕࢖ΘΕΔ #JTPOʹ௥Ճ͞Εͨ৽͍͠ػೳ΋͙͢ʹ࢖͏͜ͱ͕Ͱ͖ͳ͍ɹ #JTPOʹػೳΛ௥Ճͨ͠ΓػೳΛ֦ு͢Δͷ͸೉͍͠ #JTPOͷϢʔβʔ͸໪࿦3VCZ͚ͩͰ͸ͳ͍ʢͦΕ͸ͦ͏ʣ มߋ͢Δʹ͸ଟ͘ͷௐ੔΍ٞ࿦͕ඞཁ

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SVCZMSBNB1VSF3VCZ-"-3QBSTFSHFOFSBUPS 3VCZ੡ͷ-"-3  ύʔαδΣωϨʔλ 3VCZίϛολͷ:VJDIJSP,BOFLP !ZVJLOL ͞Μ͕࡞ऀ #JTPOܗࣜͷจ๏ϑΝΠϧΛೖྗͱͯ͠$Ͱॻ͔Εͨ1BSTFSΛग़ྗ͢Δ 3VCZ͕࢖༻͍ͯ͠Δจ๏ʹݶͬͯ͸#JTPOͱޓ׵ੑ͕͋Δ :BDDɺ#JTPOͱ͍͏ϞϑϞϑͷ࢛଍าߦͷಈ෺ͷܥේͰͷ໋໊ -MBNBͩͱ--ύʔαʔʹݟ͑ΔͷͰ-3BNBͱ͍͏௲Γʹ

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1BSTFS(FOFSBUPS ΞʔΩςΫνϟ $PNNBOE -JOF *OUFSGBDF จ๏ϑΝΠϧ 1BSTFS (SBNNBS 4ZTUFN 4UBUF .BOBHFS $PEF (FOFSBUPS

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1BSTFS(FOFSBUPS ΞʔΩςΫνϟ $PNNBOE -JOF *OUFSGBDF จ๏ϑΝΠϧ 1BSTFS (SBNNBS 4ZTUFN 4UBUF .BOBHFS $PEF (FOFSBUPS

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$PNNBOE-JOF*OUFSGBDF -SBNBͷίϚϯυ࣮ߦΛ࢘Δத৺తͳΫϥε ೖྗͱͳΔจ๏ϑΝΠϧ΍֤छΦϓγϣϯΛड͚औͬͯɺ1BSTFSੜ੒ϓϩ ηεશମͷΦʔέετϨʔγϣϯΛߦ͏ % lrama - h Lrama is LALR (1) parser generator written by Ruby. Usage: lrama [options] FILE STDIN mode: lrama [options] - FILE read grammar from STDIN Tuning the Parser: -S, - - skeleton=FILE specify the skeleton to use - t, - - debug display debugging outputs of internal parser same as '-Dparse.trace' - - locations enable location support -D, - - def i ne=NAME[=VALUE] similar to '%def i ne NAME VALUE'

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1BSTFS(FOFSBUPS ΞʔΩςΫνϟ $PNNBOE -JOF *OUFSGBDF จ๏ϑΝΠϧ 1BSTFS (SBNNBS 4ZTUFN 4UBUF .BOBHFS $PEF (FOFSBUPS

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(SBNNBS4ZTUFN ೖྗ͞Εͨจ๏ϑΝΠϧΛղੳ͢Δ੹೚Λ࣋ͭ ҎԼΛऔΓࠐΈɺίʔυੜ੒ʹར༻Մೳͳ಺෦తͳจ๏දݱΛߏங จ๏نଇɺऴ୺ه߸ɾඇऴ୺ه߸ͱ͍ͬͨγϯϘϧ ԋࢉࢠͷ༏ઌॱҐએݴ ϢʔβʔఆٛͷΞΫγϣϯίʔυ

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(SBNNBS4ZTUFN -FYFSͱ1BSTFSΛ͍࣋ͬͯΔ -FYFSਖ਼نදݱͰτʔΫϯΛ੾Γग़͍ͯ͠Δ 1BSTFSSVCZSBDDͱ͍͏1BSTFS(FOFSBUPSΛ࢖ͬͯੜ੒͍ͯ͠Δ SBDD ੨໦ๆ࿠͞Μ͕࡞ऀͷ-"-3  1BSTFS(FOFSBUPS 3VCZͰॻ͔Εͨ1BSTFSΛग़ྗ͢Δ

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SBDDͰ#JTPOΛஔ͖׵͑Ε͹͍͍ͷͰ͸ ੜ੒ΞϧΰϦζϜ͸ಉ͡Ͱ-"-3   ೖྗͷจ๏ϑΝΠϧͦͷ΋ͷͷจ๏ϑΝΠϧ͕ҟͳΔ #JTPO͸:BDD#JTPOܗࣜɺSBDD͸ಠࣗͷه๏ ग़ྗ͢Δ1BSTFSͷݴޠ͕ҟͳΔ #JTJPO͸$ݴޠɺSBDD͸3VCZ parser_option: "%expect" INTEGER { @grammar.expect = val[1] } | "%def i ne" variable value { @grammar.def i ne[val[1].s_value] = val[2]&.s_value }

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(SBNNBS4ZTUFN "DUJPOTͷ෦෼ͷղੳ΍ࢀরղܾ΋ඞཁ "DUJPO͸จ๏نଇʹҰகͯؐ͠ݩ͢Δॠؒʹ࣮ߦ͞ΕΔ ΍ɺOɺ!Oͱ͍͏ಛघͳม਺Λ࢖༻͢Δ͜ͱͰऴ୺ɾඇऴ୺ه߸ͷ஋ ΍Ґஔ৘ใʹΞΫηεՄೳͳͷͰɺͦΕΒΛஔ͖׵͑Δ if_tail: opt_else | k_elsif expr_value then compstmt(stmts) if_tail { $$ = new_if(p, $2, $4, $5, &@$, &@1, &@3, &NULL_LOC); f i xpos($$, $2); / * % ripper: elsif!($ : 2, $ : 4, $ : 5) % * / } ;

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1BSTFS(FOFSBUPS ΞʔΩςΫνϟ $PNNBOE -JOF *OUFSGBDF จ๏ϑΝΠϧ 1BSTFS (SBNNBS 4ZTUFN 4UBUF .BOBHFS $PEF (FOFSBUPS

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4UBUF.BOBHFS (SBNNBS4ZTUFN͔Βड͚औͬͨ಺෦จ๏දݱΛ༻͍ͯɺεςʔτϚγ ϯΛܭࢉ͓Αͼ؅ཧ͠·͢ ·ͨɺߏจղੳදΛੜ੒͢Δ໾ׂ΋୲͍ͬͯΔ

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1BSTFS(FOFSBUPS ΞʔΩςΫνϟ $PNNBOE -JOF *OUFSGBDF จ๏ϑΝΠϧ 1BSTFS (SBNNBS 4ZTUFN 4UBUF .BOBHFS $PEF (FOFSBUPS

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$PEF(FOFSBUPS εςʔτϚγϯͱߏจղੳදΛݩʹ࣮ߦՄೳͳ1BSTFSͷίʔυΛੜ੒͢Δ 5FNQMBUFʹ஋ΛຒΊࠐΜͰ͍͘ SVCZFSCͱ͍͏ςϯϓϨʔτγεςϜΛ࢖ͬͯຒΊࠐΉ / * - - - - - - - - - - . | yyparse. | ` - - - - - - - - - - * / int yyparse (<%= output.parse_param %>) { <%# b4_declare_scanner_communication_variables -%> / * Lookahead token kind. * / int yychar; / * The semantic value of the lookahead symbol. * / / * Default value used for initialization, for pacifying older GCCs or non-GCC compilers. * / #ifdef _ _ cplusplus static const YYSTYPE yyval_default = {}; (void) yyval_default; #else YY_INITIAL_VALUE (static const YYSTYPE yyval_default;)

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ػೳͷ֦ு

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ͱ͸͍͑1BSTFSHFOFSBUPSͷྺ࢙͸ݹ͍ ೥ʹ5POZ#SPPLFSͱ%FSSJDL.PSSJTʹΑͬͯઃܭ͕։࢝͞Εͨ#SPPLFS .PSSJT$PNQJMFS$PNQJMFS͕࠷ݹʢͳ͸ͣʣ ೥୅ॳ಄ʹ͸4UFQIFO$+PIOTPO͕:BDDΛ։ൃ ೥ʹ3PCFSU$PSCFUUʹΑͬͯ(/6#JTPO͕ॻ͔Εͨ ೥୅Ҏ߱͸ԼՐʹ ($$͸౰ॳ#JTPOΛ࢖͍͕ͬͯͨखॻ͖ͷ࠶ؼԼ߱1BSTFSʹ (P΋ಉ༷ʹ೥ʹखॻ͖ͷεΩϟφͱ1BSTFSʹ

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ػೳΛ֦ுͷ༨஍ͬͯ͋Δͷʁ ͦ΋ͦ΋#JTPOͬͯ೥͔Β։ൃ͕ଓ͍͍ͯΔΜͰ͠ΐʁͦΜͳ֦ு͢ Δ༨஍͸͋Δͷʁ ൺֱతɺ#JTPO͕αϙʔτ͍ͯ͠Δจ๏͸ϓϦϛςΟϒ ྫ͑͹ɺଞͷ1BSTFSHFOFSBUPSͷػೳ΍αϙʔτ͍ͯ͠Δศརͳจ๏ Λ࣮૷͢Ε͹#FUUFS#JTPO͕Ͱ͖Δ͔΋͠Εͳ͍

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จ๏ͷ֦ு

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΋ͬͱ͍͍ײ͡ͷจ๏͕΄͍͠ #JTPO͕ఏڙ͍ͯ͠Δจ๏͸ϓϦϛςΟϒʢ࠶ܝʣ ৑௕Ͱந৅Խͷ༨஍͕͋ΔίʔυΛΈͨΒؔ਺ʹ੾Γग़͍ͨ͠ ͕͔ͩ͠͠ɺͦΜͳจ๏͸ͳ͍

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1BSBNFUFSJ[JOH3VMFT 0$BNM޲͚ͷ-3  QBSTFSHFOFSBUPSͰ͋Δ.FOIJSͷศརػೳ ੜ੒نଇͷඇऴ୺ه߸ͷఆٛʹ͓͚Δڞ௨తͳύλʔϯΛந৅Խ͢ΔͨΊ ͷจ๏Λఏڙ͢Δ Πϝʔδͱͯ͠͸ϝιουͱͯ͠நग़Ͱ͖ΔΑ͏ʹ͢ΔͨΊͷػೳ .FOIJS3FGFSFODF.BOVBM WFSTJPO  IUUQTHBMMJVNJOSJBGSdGQPUUJFSNFOIJSNBOVBMIUNMTFD

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ࣅͨΑ͏ͳߏ଄͸Α͋͘Δ stmt : keyword_alias f i tem . . . | lhs '=' lex_ctxt mrhs { $$ = node_assign(p, $1, $4, $3, &@$); / * % ripper: assign!($ : 1, $ : 4) % * / } command_asgn : lhs '=' lex_ctxt command_rhs { $$ = node_assign(p, $1, $4, $3, &@$); / * % ripper: assign!($ : 1, $ : 4) % * / } arg : lhs '=' lex_ctxt arg_rhs { $$ = node_assign(p, $1, $4, $3, &@$); / * % ripper: assign!($ : 1, $ : 4) % * / }

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ࣅͨΑ͏ͳߏ଄͸Α͋͘Δ stmt : keyword_alias f i tem . . . | lhs '=' lex_ctxt mrhs { $$ = node_assign(p, $1, $4, $3, &@$); / * % ripper: assign!($ : 1, $ : 4) % * / } command_asgn : lhs '=' lex_ctxt command_rhs { $$ = node_assign(p, $1, $4, $3, &@$); / * % ripper: assign!($ : 1, $ : 4) % * / } arg : lhs '=' lex_ctxt arg_rhs { $$ = node_assign(p, $1, $4, $3, &@$); / * % ripper: assign!($ : 1, $ : 4) % * / }

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ߏ଄Λநग़͢Δ͜ͱ͕Ͱ͖Δ %rule asgn(rhs) : lhs '=' lex_ctxt rhs { $$ = node_assign(p, $1, $4, $3, &@$); / * % ripper: assign!($ : 1, $ : 4) % * / } ; stmt : keyword_alias f i tem . . . | asgn(rhs) ; arg : asgn(arg_rhs) ; command_asgn : asgn(command_rhs) ;

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ύϥϝʔλͱͯ͠5PLFOΛ౉͢͜ͱ͕Ͱ͖Δ %rule asgn(rhs) : lhs '=' lex_ctxt rhs { $$ = node_assign(p, $1, $4, $3, &@$); / * % ripper: assign!($ : 1, $ : 4) % * / } ; stmt : keyword_alias f i tem . . . | asgn(rhs) ; arg : asgn(arg_rhs) ; command_asgn : asgn(command_rhs) ;

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౉͞Εͨ5PLFOΛӈลʹల։͢Δ %rule asgn(rhs) : lhs '=' lex_ctxt rhs { $$ = node_assign(p, $1, $4, $3, &@$); / * % ripper: assign!($ : 1, $ : 4) % * / } ; stmt : keyword_alias f i tem . . . | asgn(rhs) ; arg : asgn(arg_rhs) ; command_asgn : asgn(command_rhs) ;

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౉͞Εͨ5PLFOΛӈลʹల։͢Δ %rule asgn(rhs) : lhs '=' lex_ctxt rhsarg_rhs { $$ = node_assign(p, $1, $4, $3, &@$); / * % ripper: assign!($ : 1, $ : 4) % * / } ; stmt : keyword_alias f i tem . . . | asgn(rhs) ; arg : asgn(arg_rhs) ; command_asgn : asgn(command_rhs) ;

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౉͞Εͨ5PLFOΛӈลʹల։͢Δ %rule asgn(rhs) : lhs '=' lex_ctxt rhscommand_rhs { $$ = node_assign(p, $1, $4, $3, &@$); / * % ripper: assign!($ : 1, $ : 4) % * / } ; stmt : keyword_alias f i tem . . . | asgn(rhs) ; arg : asgn(arg_rhs) ; command_asgn : asgn(command_rhs) ;

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ػೳͷ֦ு

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จ๏ͷߏ଄Λ͍͍ײ͡ʹݟ͍ͨ brace_block : '{' brace_body '}' { $$ = $2; set_embraced_location($$, &@1, &@3); / * % ripper: $ : 2 % * / } | k_do do_body k_end { $$ = $2; set_embraced_location($$, &@1, &@3); / * % ripper: $ : 2 % * / } ;

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จ๏ͷߏ଄ͱ"DUJPO͕ࠞࡏ brace_block : '{' brace_body '}' { $$ = $2; set_embraced_location($$, &@1, &@3); / * % ripper: $ : 2 % * / } | k_do do_body k_end { $$ = $2; set_embraced_location($$, &@1, &@3); / * % ripper: $ : 2 % * / } ;

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จ๏ͷߏ଄ͱ"DUJPO͕ࠞࡏ brace_block : '{' brace_body '}' { $$ = $2; set_embraced_location($$, &@1, &@3); / * % ripper: $ : 2 % * / } | k_do do_body k_end { $$ = $2; set_embraced_location($$, &@1, &@3); / * % ripper: $ : 2 % * / } ;

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3BJMSPBE%JBHSBN +BWB4DSJQU޲͚ͷ1BSTFS#VJMEJOHπʔϧΩοτ$IFWSPUBJOͷػೳ IUUQTHJUIVCDPN$IFWSPUBJODIFWSPUBJO จ຺ࣗ༝จ๏Λߏจਤͱͯ͠දݱ͢ΔͨΊͷػೳͰ#/'Λࢹ֮ԽͰ͖Δ

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ZEBISBJMSPBE@EJBHSBNT $IFWSPUBJO͕ґଘ͍ͯ͠ΔUBCBULJOTSBJMSPBEEJBHSBNT͕αϙʔτ͠ ͍ͯΔͷ͸+BWB4DSJQUͱ1ZUIPO͚ͩͩͬͨͷͰ3VCZ޲͚ʹ࣮૷ͨ͠ IUUQTHJUIVCDPNZEBISBJMSPBE@EJBHSBNT ଍Γ͍ͯͳ͍ػೳ΍ϥΠϒϥϦ͕͋Ε͹3VCZͰ࡞Δ ྗ͸ύϫʔ  #JTPOͩͱ͜͏͍͏ྗٕͰ৽ػೳΛ૊ΈࠐΉͷ͸೉͍͠ -SBNBͳΒࣗ෼ͨͪͷ1BSTFS(FOFSBUPSͳͷͰ΍Γ΍͍͢

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ࢥΘ͵෭࢈෺ -SBNB͸#JTPOͱޓ׵͕͋Δ #JTPOͰੜ੒͍ͯ͠Δύʔαʔ͸͢΂ͯ7JTVBMJ[FͰ͖Δ 1)1 ;FOE1BSTFS ɺ1FSMɺ.Z42-౳

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͔͜͜Βࢼͤ·͢ ZEBIHJUIVCJPSBJMSPBEEJBHSBNDPMMFDUJPO

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݁࿦ 3VCZͰ͸ʮେ1BSTFS࣌୅ʯ͕౸དྷதʢ΋͏೥໨ʂʣ ௕͘࢖ΘΕ͍ͯΔٕज़͕ͩվળͷ༨஍͸·ͩ͋Δ ࠓ೔͸৮Ε͍ͯͳ͍͕ੜ੒ΞϧΰϦζϜ΋͍͔ͭ͘ͷ࿦จ͕͋Δ $4ΛਓੜͰֶΜͰ͜ͳ͔ͬͨࢲ͕ͷΊΓࠐΉ͘Βָ͍͍͠ʢͭ·Γͱͯ΋ָ͠ ͍ʣ -31BSTFS͸͍͍ͧ -31BSTFS͸͍͍ͧ

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