Chapter 16. Using Parsec
The task of parsing a file, or data of various types, is a common one for programmers. We already learned about Haskell's support for regular expressions back in the section called “Regular expressions in Haskellâ€. Regular expressions are nice for many tasks, but they rapidly become unwieldy, or cannot be used at all, when dealing with a complex data format. For instance, we cannot use regular exp
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ã¾ãšã¯ã€Audrey ã•ã‚“ãŒè¨€ã£ãŸ Haskell ã®æ®ºã—æ–‡å¥ã‚’æ€ã„出ã—ã¦é ‚ããŸã„。 æ£è¦è¡¨ç¾ãƒ™ãƒ¼ã‚¹ã®ãƒ‘ーサã¯ãƒ¡ãƒ³ãƒ†ãƒŠãƒ³ã‚¹ã—ã«ãã„ã®ã«æ°—ã¥ã„ãŸï¼Ÿ Parsec を使ã£ã¦ 15分㧠Perl6 ã®å®Œå…¨ãªãƒ‘ーサを書ã方法を勉強ã—ã¾ã—ょã†ã€‚ 15分ã¨ã„ã†ã®ã¯èª‡å¼µãŒå…¥ã£ã¦ã„ã‚‹ã¨æ€ã†ãŒã€æ£è¦è¡¨ç¾ãŒä¿å®ˆã—ã«ããã€Haskell ã® Parsec ã¯å¼·åŠ›ã§ä¿å®ˆã—易ã„ã®ã¯äº‹å®Ÿã 。ãã®ç†ç”±ã‚’ Perl 㨠Haskell ã®ã‚³ãƒ¼ãƒ‰ã‚’示ã—ãªãŒã‚‰èª¬æ˜Žã—ã¦ã¿ãŸã„ã¨æ€ã†ã€‚ Perl ã‚’æ„›ã™ã‚‹æ–¹ã«ï¼šã“ã®è¨˜äº‹ã¯ Perl を攻撃ã™ã‚‹ãŸã‚ã«æ›¸ã„ãŸã®ã§ã¯ãªã„。Perl ã‚’é¸ã‚“ã ã®ã¯ã€æ£è¦è¡¨ç¾ã‚’広ã‚ãŸè¨€èªžã§ã‚ã‚Šã€åƒ•ãŒãã‚Œãªã‚Šã« Perl ã®ã‚³ãƒ¼ãƒ‰ã‚’書ã‘ã‚‹ãŸã‚ã§ã‚る。ã“ã®è¨˜äº‹ã®ç›®çš„ã¯ã€æ£è¦è¡¨ç¾ã‚ˆã‚Šã‚‚関数型パーサー(Parsec)ã®æ–¹ãŒå„ªã‚Œã¦ã„ã‚‹ã¨ç¤ºã™ã“ã¨ã 。 例題 ã“ã®è¨˜äº‹ã§ã¯ä¾‹é¡Œã¨ã—ã¦ã€IPv4 アドレスを解æžã™ã‚‹é–¢æ•°ã‚’書ã
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