1. ã¯ããã«
è¿å¹Žãããã°ã©ãã³ã°ã®äžçã§ã¯ãå€ãã®èšèªãéçºããããã®èšèªããããã«åããã䟿å©ãªããŒã«ãçšæãããŠããŸããä»åã¯ããã®äžã§ãåºã掻çšãããŠããSchemeãšããèšèªããããŠãã®ãã¬ãŒã ã¯ãŒã¯ã«ã€ããŠæ·±ãæãäžããŠãããããšæããŸãã
1.1 Schemeãšã¯
Schemeã¯ãLISPãšããèšèªã®äžã€ã§ãéåžžã«ãã¯ãã«ã§è¡šçŸåã®é«ãèšèªã§ããSchemeã¯ããã®ã·ã³ãã«ããšåŒ·åãªè¡šçŸåãããã¢ã«ãŽãªãºã ãããŒã¿æ§é ãåŠã¶ããã®éå ·ãšããŠåºãå©çšãããŠããŸãã
1.2 Schemeãã¬ãŒã ã¯ãŒã¯ãšã¯
èšèªãå·¥å ·ã§ãããªãã°ããã¬ãŒã ã¯ãŒã¯ã¯ããããå¹çããæ±ãããã®èšèšå°ã«èŠç«ãŠãããšãã§ããŸããSchemeãã¬ãŒã ã¯ãŒã¯ãšã¯ããã¯ãã«ãªèšèªã§ããSchemeãããã«å¹ççã«äœ¿ãããã®ããŒã«çŸ€ã®ããšãæããŸããéçºè ã¯ãSchemeãã¬ãŒã ã¯ãŒã¯ãéããŠå¹ççã«ã³ãŒãã£ã³ã°ããããé«æ©èœãªã¢ããªã±ãŒã·ã§ã³ãçŽ æ©ãéçºããããšãã§ããŸãã
1.3 ãã¬ãŒã ã¯ãŒã¯ãšã©ã€ãã©ãªã®éã
ããã°ã©ãã³ã°ã«ãããŠããã¬ãŒã ã¯ãŒã¯ãšã©ã€ãã©ãªã¯ãã䌌ããããªååšã«æããããããããŸããããããããã®éããç解ããããšã¯ãããé©åãªéžæãããéã«éèŠã§ãã
ã©ã€ãã©ãªã¯ãããŸã§ããŒã«ã®éãŸãã§ãããããã©ã®ããã«é£æºãããã©ã®ããã«äœ¿çšãããã¯éçºè 次第ã§ããäžæ¹ããã¬ãŒã ã¯ãŒã¯ã¯ã¢ããªã±ãŒã·ã§ã³å šäœã®èšèšã«åœ±é¿ãäžãããã®åäœãèŠå®ããã«ãŒã«ãèŠçŽãæäŸããŸãã
èšãæããã°ãã©ã€ãã©ãªã䜿çšããå Žåãããªããã³ãŒãã®ç¡é§ãçãããã®åœ¹ç«ã€ããŒã«ãéžæããããã䜿çšããããšãã§ããŸãã察ããŠãã¬ãŒã ã¯ãŒã¯ã®å Žåã¯ãããªãããã®äžã§åäœããã³ãŒããäœæãããã¬ãŒã ã¯ãŒã¯èªäœãã³ãŒãã®å¶åŸ¡ãšå®è¡ãæ åœããŸãã
2. Schemeãã¬ãŒã ã¯ãŒã¯ã®åºæ¬
ããã°ã©ãã³ã°èšèªã«ã¯ãã£ãããšåŠã¶ããšã§åŸãããç¥èãèŠç¹ããããŸããããã®äžã€ã«ããã¬ãŒã ã¯ãŒã¯ããæããããŸããç¹ã«ãSchemeãã¬ãŒã ã¯ãŒã¯ã¯ãã®åºæ¬ããæŽãããšã§å€å€§ãªå©ç¹ãæäŸããŸãã
2.1 Schemeãã¬ãŒã ã¯ãŒã¯ã®å©ç¹
Schemeãã¬ãŒã ã¯ãŒã¯ã¯ããã®ç¹æ§ãšããŠé«åºŠãªæœè±¡åãèšè¿°åãæ¡åŒµæ§ããããŸãããããã¯ãéçºè ãã³ãŒããããç°¡æœã«æžãåãé«ããè€éãªæ©èœãã¢ããªã±ãŒã·ã§ã³ãããç°¡åã«å®è£ ããæ段ãæäŸããŸãããŸããSchemeãã¬ãŒã ã¯ãŒã¯ã«ã¯åŒ·åãªã¡ã¿ããã°ã©ãã³ã°æ©èœãå«ãŸããŠãããããªãèªèº«ãã³ãŒããæžãæ¹æ³ã«æè»æ§ãšè¡šåãäžããŸãã
2.2 Schemeãã¬ãŒã ã¯ãŒã¯ã䜿çšããã¡ãªãã
Schemeãã¬ãŒã ã¯ãŒã¯ã䜿çšãããšãããªãã®ã³ãŒãã«çŽ æ©ãç¹°ãè¿ãå¯èœãªæ§é ãå°å ¥ã§ãããããå¹çæ§ãšçç£æ§ãåäžãããŸãããŸããåå©çšå¯èœãªã³ãŒãã®äœæã«å¯ŸããSchemeã®ã¢ãããŒãã¯ããããžã§ã¯ãéã§ã®ã³ãŒãã®å ±æã容æã«ããéçºè ãæ°ãããããžã§ã¯ããè¿ éã«ç«ã¡äžããããšãå¯èœã«ããŸããããã«ããã¬ãŒã ã¯ãŒã¯ãæäŸãã匷åãªæœè±¡åæ©æ§ã«ãããè€éãªåé¡ããã管çå¯èœãªå°ããªéšåã«åå²ããããšã容æã«ãªããŸãã
2.3 Schemeãã¬ãŒã ã¯ãŒã¯ã®ä»£è¡šçãªæ©èœ
Schemeãã¬ãŒã ã¯ãŒã¯ã«ã¯ãããã€ãã®éèŠãªäž»èŠæ©èœããããŸãããããã¯ãæç¶ãã®æœè±¡åãšããŒã¿ã®æœè±¡åãããã«å ããŠã¡ã¿ããã°ã©ãã³ã°ã§ãããããã®æ©èœã¯ããã¬ãŒã ã¯ãŒã¯ãéçºè ã«æäŸããäž»ãªããŒã«ã§ããããããããéçºããã»ã¹ãããŸããŸãªæ¹æ³ã§é«åºŠã«ãµããŒãããŸãã
3. Schemeãã¬ãŒã ã¯ãŒã¯ã®ã€ã³ã¹ããŒã«ãšã»ããã¢ãã
Schemeãã¬ãŒã ã¯ãŒã¯ãå§ããåã«ã¯ãç¹å®ã®ããŒã«ãšç°å¢ãå¿ èŠãšãªããŸããæ£ç¢ºãªã€ã³ã¹ããŒã«æ¹æ³ãç解ããã»ããã¢ããæé ãææ¡ããããšã§ãã¹ã ãŒãºã«åŠç¿ãç¶ããããšãå¯èœãšãªããŸãã
3.1 å¿ èŠãªããŒã«ãšç°å¢
ãŸãåãã«ãSchemeãã¬ãŒã ã¯ãŒã¯ãåããããã«ã¯ãSchemeç°å¢ãPCã«ã€ã³ã¹ããŒã«ããå¿ èŠããããŸãããŸããããã¹ããšãã£ã¿ïŒäŸãã°Visual Studio CodeãSublime TextçïŒãã€ã³ã¹ããŒã«ããŠãã³ãŒãã®äœæãç·šéãè¡ããŸãã
Schemeãã¬ãŒã ã¯ãŒã¯ã®åäœã«å¿ èŠãªå ·äœçãªPCã®ã¹ããã¯ãOSã®ããŒãžã§ã³ã¯å ¬åŒããã¥ã¡ã³ããŒã·ã§ã³ãã€ã³ã¹ããŒã«ã¬ã€ããåç §ããŠãã ããã倧ãŸãã«ã¯ãçŸä»£ã®å€ãã®PCãªãã°åäœã«åé¡ã¯ãããŸããã
3.2 ã€ã³ã¹ããŒã«æ¹æ³
Schemeç°å¢ã¯ãå ¬åŒãŠã§ããµã€ãããããŠã³ããŒãããããšãã§ããŸããããŠã³ããŒããããã¡ã€ã«ãéããæ瀺ã«åŸã£ãŠã€ã³ã¹ããŒã«ãé²ããŠãããŸãã
詳现ãªæé ã¯OSã«ããè¥å¹²ç°ãªãã®ã§ãOSã«åãããæé ãå ¬åŒãµã€ãã®ããã¥ã¡ã³ããŒã·ã§ã³ããã¥ãŒããªã¢ã«ããæ¢ãããšãããããããŸãã
3.3 ã»ããã¢ããæé
ã€ã³ã¹ããŒã«ãå®äºãããã次ã«Schemeãã¬ãŒã ã¯ãŒã¯ã®ã»ããã¢ãããè¡ããŸããSchemeãã¬ãŒã ã¯ãŒã¯ã®ã»ããã¢ããã¯ãå¿ èŠãªã©ã€ãã©ãªãã€ã³ã¹ããŒã«ããããåæèšå®ãè¡ãäºãå«ãŸããŸãã
å ·äœçãªã»ããã¢ããæé ãå ¬åŒã®ããã¥ã¡ã³ããŒã·ã§ã³ãåç §ããããšããå§ãããŸããæ£ããæé ã«åŸã£ãŠèšå®ãè¡ããŸããããããããããšã§ãSchemeãã¬ãŒã ã¯ãŒã¯ã®äœ¿ãæ¹ãåŠãã§ããäžã§ã®éå£ãåãé€ãããšãã§ããŸãã
4. å®éã«Schemeãã¬ãŒã ã¯ãŒã¯ã䜿ã£ãŠã¿ã
ãããŸã§ã®ç¥èãåºã«ãããããSchemeãã¬ãŒã ã¯ãŒã¯ã掻çšãããããžã§ã¯ããäœæããŠãããŸãããã
4.1 æåã®ãããžã§ã¯ãã®äœæ
å§ããåã«ãSchemeãã¬ãŒã ã¯ãŒã¯ãæ£ããã€ã³ã¹ããŒã«ãããŠããã確èªããŸããversionã³ãã³ãã䜿ã£ãŠããŒãžã§ã³æ å ±ã衚瀺ãããã€ã³ã¹ããŒã«ãæåããŠããããšã確èªããŸãã
$ scheme --version
次ã«ãæ°ãããããžã§ã¯ãã®äœæã«ç§»ããŸããããã§ã¯initã³ãã³ããå©çšããŸãã以äžã¯ã”myproject”ãšããååã®æ°èŠãããžã§ã¯ããäœæããäŸã§ãã
$ scheme init myproject
ãã®ã³ãã³ããå®è¡ãããšã”myproject”ãšãããã£ã¬ã¯ããªãäœæãããæ°èŠãããžã§ã¯ãã®é圢ãçæãããŸãã
4.2 åºæ¬çãªæ©èœã®äœ¿ãæ¹
Schemeãã¬ãŒã ã¯ãŒã¯ã®åºæ¬çãªæ©èœã«ã€ããŠèŠãŠããããšã«ããŸããããæåã«ãããŒã¿ã®æäœã§ããSchemeãã¬ãŒã ã¯ãŒã¯ã§ã¯defineã䜿çšããŠå€æ°å®çŸ©ãè¡ããŸãã次ã«ç€ºãäŸã§ã¯ã”message”ãšããååã®å€æ°ãå®çŸ©ãã”Hello, World!”ãšããæååãå²ãåœãŠãŠããŸãã
(define message "Hello, World!")
ãããŠãdisplayé¢æ°ã䜿çšããŠå€æ°ã®å€ã衚瀺ããããšãã§ããŸãã
(display message)
4.3 ãµã³ãã«ã³ãŒããšãã®è§£èª¬
æåŸã«ãSchemeãã¬ãŒã ã¯ãŒã¯ã§ã®ããã°ã©ã ãæžãéã®äžäŸãèŠãŠã¿ãŸãããã
(define message "Hello, World!") (define (print-message) (display message) ) (print-message)
ãã®ã³ãŒãã¯åçŽãªãã®ã§ãããSchemeãã¬ãŒã ã¯ãŒã¯ã®ç¹åŸŽãæããŠããŸãã”message”ãšããå€æ°ãå®çŸ©ãããã®åŸã«”print-message”ãšããé¢æ°ãå®çŸ©ããŠããŸãããã®é¢æ°å éšã§ãdisplayé¢æ°ã䜿çšã㊔message”å€æ°ã®å€ã衚瀺ããŠããŸããæåŸã®è¡ã§”print-message”é¢æ°ãåŒã³åºãããšã§ãç»é¢ã«”Hello, World!”ãšè¡šç€ºããããšããæµãã§ãã
ããããã®ç« ã§ã¯ãæŽã«è€éãªæ©èœã®äœ¿ãæ¹ãããããžã§ã¯ãã®æ§ææ¹æ³ã«ã€ããŠåŠãã§ãããŸããåããŠããã°ã©ãã³ã°ãåŠã³å§ããŠããæ¹ã§ãåãããããæãã解説ããŠããã€ããã§ãã
5. Schemeãã¬ãŒã ã¯ãŒã¯ã§ã®éçºã®ãã³ã
çŸåšã®ããã°ã©ãã³ã°ãšã³ã·ã¹ãã ã§ã¯ããã¬ãŒã ã¯ãŒã¯ãéèŠãªåœ¹å²ãæãããŠããŸããããã¯ãSchemeãã¬ãŒã ã¯ãŒã¯ã§ãåãã§ããããããã©ã®ãã¬ãŒã ã¯ãŒã¯ã䜿ã£ãŠããŠãããšã©ãŒãçºçããå¯èœæ§ã¯åžžã«ãããŸããããã§ã¯ãSchemeãã¬ãŒã ã¯ãŒã¯ã䜿ã£ãŠéçºãé²ããäžã§ééããå¯èœæ§ã®ãããããããšã©ãŒãšãã®å¯ŸåŠæ³ã«ã€ããŠè§£èª¬ããŸãã
5.1 ãããããšã©ãŒãšå¯ŸåŠæ³
åå¿è ã«ãã¢ã¯ã»ã¹ããããErrorsãšããååã®ã¢ãžã¥ãŒã«ãSchemeãã¬ãŒã ã¯ãŒã¯ã«ã¯ååšãããã®äžã«ã¯å€ãã®æ§ã ãªãšã©ãŒåŠçé¢é£ã®é¢æ°ãå®çŸ©ãããŠããŸããæåãããã®å šãŠãèŠããå¿ èŠã¯ãããŸããããããã§ã¯äžéšãéçºè ãæãããééããã§ããããšã©ãŒãšãã®è§£æ±ºæ³ã«ã€ããŠèããŠã¿ãŸãããã
ãšã©ãŒ1: å€æ°ãå®çŸ©ãããŠããªã(Error: variable not bound) ãšã©ãŒ2: é¢æ°ãæ£ããåŒã³åºãããŠããªã(Error: bad procedure call) ãšã©ãŒ3: è¿ãå€ãæ³å®ããåãšç°ãªã(Error: bad return type)
ãããã®ãšã©ãŒã解決ããããã«ã¯ãããããé©åãªãããã°æ段ãååšããŸããã³ãŒããªãŒãã£ã³ã°ãéãããšã©ãŒã¡ãã»ãŒãžãæ£ããç解ããé©åãªä¿®æ£ãè¡ãããšã§ãšã©ãŒã解æ¶ã§ããŸãã
5.2 ãããã°æ¹æ³
Schemeãã¬ãŒã ã¯ãŒã¯ã§ã®ãããã°æ¹æ³ã«ã€ããŠè§£èª¬ããŸãããŸããSchemeãã¬ãŒã ã¯ãŒã¯ã«ã¯ãããã¬ãçµã¿èŸŒãŸããŠããŸãããã®ãããã¬ãå©çšããããšã§ãã³ãŒãå ã®æ§ã ãªéšåã詳现ã«èª¿æ»ããããç¶æ ãé次ç£èŠãããããããšãã§ããŸãããŸãããããã¬ã¯ã¹ãããå®è¡ããµããŒãããŠãããäžè¡ãã€ã³ãŒããå®è¡ããŠåäœã確èªããããšãã§ããŸãã
ãŸããSchemeãã¬ãŒã ã¯ãŒã¯ã§ã¯ãŠããããã¹ãã®å°å ¥ãæšå¥šãããŠããŸããåé¢æ°ã®åäœãå°èŠæš¡ãªãã¹ãã§ç¢ºèªããäžéšã®ãšã©ãŒãé²ãããã®æç«ãŠãšãªããŸãã
5.3 æçšãªãªãœãŒã¹ãšåèæç®
Schemeãã¬ãŒã ã¯ãŒã¯ãåŠã³ã䜿ãããªãã«ã¯å€ãã®ãªãœãŒã¹ãå¿ èŠãšãªããŸããå ¬åŒããã¥ã¡ã³ããŒã·ã§ã³ããªã³ã©ã€ã³ã®ã³ãã¥ããã£ãåèæžãªã©ãããã«è©²åœããŸãã以äžã«ãSchemeãã¬ãŒã ã¯ãŒã¯ãåŠã¶äžã§åœ¹ç«ã€ãªãœãŒã¹ãšåèæç®ãããã€ã玹ä»ããŸãã
1. The Scheme Programming Language 2. How to Design Programs 3. Racket: A Programmer's Introduction 4. Introduction to Scheme 5. SICP (Structure and Interpretation of Computer Programs)
ãããã®ãªãœãŒã¹ã掻çšããããšã§ãSchemeãã¬ãŒã ã¯ãŒã¯ã®ç解ãæ·±ãŸããéçºèœåãåäžããããšã§ãããã
6. å¿çšçãªäœ¿ãæ¹
ãããŸã§ã«Schemeãã¬ãŒã ã¯ãŒã¯ã®åºæ¬çãªäœ¿ãæ¹ãåŠãã§ããŸããããããã«ã¹ãã«ã¢ãããç®æãããã«ã¯å¿çšçãªäœ¿ãæ¹ãèŠããããšãéèŠã§ãããã®ã»ã¯ã·ã§ã³ã§ã¯ã³ãŒãã®å¹ççãªæžãæ¹ããã¹ãã®èªååããããŠé«åºŠãªæ©èœã®æŽ»çšæ³ã«ã€ããŠè§£èª¬ããŸãã
6.1 ã³ãŒãã®å¹ççãªæžãæ¹
Schemeãã¬ãŒã ã¯ãŒã¯ã¯ãã³ãŒãã®å¹çæ§ãåäžãããããã®æ©èœãããã€ãæäŸããŠããŸããäžã€ã¯ãé¢æ°ã®åå©çšæ§ãé«ããããã®ãã€ã€ãŒãªãŒããŒé¢æ°ã§ãããããã®é¢æ°ã¯ãä»ã®é¢æ°ãåŒæ°ãšããŠãšããããŸãã¯æ»ãå€ãšããŠè¿ãããšãã§ããŸãããã䜿ãããé¢æ°ãäžåºŠå®çŸ©ãããããæ§ã ãªå Žæã§å©çšããããšãã§ããã®ã§ãã
ãŸããSchemeãã¬ãŒã ã¯ãŒã¯ã§ã¯ãå€æ°ã®ã¹ã³ãŒã管çããšã©ãŒãã³ããªã³ã°ãé«åºŠã«å¶åŸ¡ã§ããŸããããã«ãããã³ãŒãã®æµããæ確ã«ãããšã©ãŒãçºçããå Žåã®æåãäºæž¬ãããããªããŸãã
6.2 ãã¹ãã®èªåå
ãœãããŠã§ã¢éçºã«ãããŠã¯ããã¹ãã¯éåžžã«éèŠãªå·¥çšã§ããç¹ã«ãã³ãŒãã®å¯èªæ§ãšä¿å®æ§ãé«ãããã°ãæªç¶ã«é²ãããã«åäœãã¹ããçµ±åãã¹ããè¡ãã¹ãã§ããSchemeãã¬ãŒã ã¯ãŒã¯ã¯ããã¹ãã®èªååããµããŒãããä»çµã¿ãæäŸããŠããŸãã
éçºè ã¯ç¬èªã®ãã¹ãã±ãŒã¹ãäœæãããããå®è¡ããéã«ãã¬ãŒã ã¯ãŒã¯ãèªåçã«ãµããŒãããŸããããã«ããããã¹ãã®äœæãšç®¡çã容æã«ãªããããå ç¢ãªã³ãŒããæžãããšãã§ããŸãã
6.3 é«åºŠãªæ©èœã®æŽ»çšæ³
Schemeãã¬ãŒã ã¯ãŒã¯ã«ã¯ãéçºè ãçç£æ§ãåäžãããããšãå¯èœã«ããé«åºŠãªæ©èœãå«ãŸããŠããŸããããšãã°ãã¢ãžã¥ãŒã«éã®äŸåé¢ä¿ã管çããããã®ã·ã¹ãã ããããŸããããã«ãããã³ãŒãã®æ§é ãæŽçããåæ©èœã»ã¢ãžã¥ãŒã«ãç¬ç«ããŠåäœããããã«ä¿èšŒããããšãã§ããŸãã
ãŸããSchemeãã¬ãŒã ã¯ãŒã¯ã¯ãã¯ãã·ã¹ãã ãåããŠããŸããããã¯ãã³ãŒãããã綺éºã«ããåå©çšããããšãå¯èœã«ããæ©èœã§ããã·ã¹ãã ã倧èŠæš¡ã«ãªãã«ã€ããŠããã¯ãã®å©çšã¯ã³ãŒãã®ä¿å®æ§ãšå¯èªæ§ã倧ããåäžãããŸãã
以äžã®æ©èœãåŠã¶ããšã§ãSchemeãã¬ãŒã ã¯ãŒã¯ãããå¹æçã«æŽ»çšããããšãã§ããŸãã次ã®ã¹ããããšããŠã¯ããããã®æŠå¿µãå®éã«ãããžã§ã¯ãã«é©çšããç·Žç¿ããããšããå§ãããŸãã
7. ãŸãšã
æ¬èšäºãéããŠãSchemeãã¬ãŒã ã¯ãŒã¯ã«ã€ããŠã®åºæ¬ããå¿çšãŸã§ãç¶²çŸ çã«åŠãã§ããŸããã
7.1 Schemeãã¬ãŒã ã¯ãŒã¯ã®åŠã³æ¹
åå¿è ãSchemeãã¬ãŒã ã¯ãŒã¯ãåŠã¶éã«ã¯ããŸããã®å©ç¹ãç解ããããšãå¿ èŠã§ããããããå ·äœçãªã€ã³ã¹ããŒã«æ¹æ³ãã»ããã¢ããæé ãåºæ¬çãªäœ¿ãæ¹ã«ã€ããŠææ¡ããããšãæ±ããããŸãããã®äžã§ãå®éã«æãåãããŠã¿ãããšã§ç解ãæ·±ããŠããã®ãçæ³çã§ãã
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