esrap-peg \u56fa\u6709\u3068\u3044\u3046\u3088\u308a PEG \u306e\u6027\u8cea\u3067\u3059\u304c\u3001\u4f8b\u3048\u3070\u672b\u5c3e\u304c ‘r’ \u306a\u5c0f\u6587\u5b57\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u5217\u304c\u53d7\u7406\u3055\u308c\u308b\u30d1\u30fc\u30b5\u3092\u5b9a\u7fa9\u3057\u3088\u3046\u3068\u3057\u3066\u3001Yacc \u3068\u540c\u69d8:<\/p>\n
G <- foo bar\r\n foo <- [a-z]*\r\n bar <- 'r'<\/code><\/pre>\n\u3068\u3059\u308b\u3068\u3001”abcr” \u306a\u3069\u3092\u98df\u308f\u305b\u308b\u3068\u898f\u5247 foo \u304c\u672b\u5c3e\u306e ‘r’ \u307e\u3067\u98df\u3079\u3066\u3057\u307e\u3044\u7d76\u5bfe\u3082\u3069\u3055\u306a\u3044\u306e\u3067\u4e0a\u306e\u5b9a\u7fa9\u3067\u4f5c\u3063\u305f\u30d1\u30fc\u30b5\u306f\u9858\u3063\u305f\u3088\u3046\u306b\u306f\u52d5\u304d\u307e\u305b\u3093\u3002\u898f\u5247 bar \u304c\u4e0d\u9069\u5408\u306b\u306a\u3063\u3066\u5e38\u306b\u975e\u53d7\u7406\u3067\u3059\u3002
\nPEG \u306e ‘*’ \u3084 ‘+’ \u306f\u3001\u6700\u5927\u9069\u5408\u307e\u3067\u98df\u3063\u3066\u623b\u3055\u306a\u3044\u305f\u3081\u3067\u3059\u304c\u3001\u305d\u308c\u306a\u3089\u3070\u3068\u3044\u3046\u3053\u3068\u3067\u3001<\/p>\n
G <- foo bar\r\n foo <- (foo [a-z]) \/ [a-z]\r\n bar <- 'r'\r\n<\/code><\/pre>\n\u3068\u3057\u3066\u3082\u306a\u3093\u3089\u5909\u308f\u308a\u307e\u305b\u3093\u3002
\n\u9858\u3063\u305f\u3088\u3046\u306a\u6587\u5b57\u5217\u3092\u53d7\u7406\u3059\u308b\u30d1\u30fc\u30b5\u3092\u5b9a\u7fa9\u3059\u308b\u306a\u3089\u3001foo \u306e\u898f\u5247\u3092\u4f8b\u3048\u3070<\/p>\n
foo <- ([a-z] foo) \/ ([a-z] & bar)<\/code><\/pre>\n\u306a\u3069\u3068\u306a\u308a\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u3053\u308c\u3067\u306f\u898f\u5247 foo \u306f\u5358\u72ec\u3067\u306f\u6210\u308a\u7acb\u305f\u305a\u3001\u5fc5\u305a\u5f8c\u7d9a\u3057\u3066\u898f\u5247 bar \u3092\u6e80\u305f\u3055\u306a\u3044\u3068\u3044\u3051\u306a\u3044\u306e\u3067\u3001\u898f\u5247\uff08\u6587\u6cd5\uff09G \u304b\u3089\u306e\u9069\u7528\u3057\u304b\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n
esrap \u306e\u30d1\u30fc\u30b5\u306f (esrap:parse ‘foo “…”) \u3068\u3059\u308c\u3070\u3001\u5358\u72ec\u306e\u898f\u5247\u3092\u53d7\u7406\u3059\u308b\u304b\u8a66\u305b\u307e\u3059\u3002<\/p><\/blockquote>\n
\u3061\u306a\u307f\u306b “rrrr” \u3092\u30d0\u30fc\u30b9\u3057\u305f\u69cb\u6587\u89e3\u6790\u6728\u306f\u3001<\/p>\n
\r\n(G ((FOO (\"r\" (FOO (\"r\" (FOO (\"r\" (BAR \"r\")<\/span>)))))) (BAR \"r\")))\r\n<\/code><\/pre>\n\u306a\u3069\u3068\u306a\u3063\u3066\u3057\u307e\u3044\u3001\u8d64\u5b57\u306e\u90e8\u5206\u306b\u82e5\u5e72\u306e\u7121\u99c4\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u4f8b\u3067\u306f\u3001\u82e5\u5e72\u3067\u6f84\u3093\u3067\u307e\u3059\u304c\u3001\u898f\u5247 bar \u304c\u305d\u308c\u4ee5\u4e0b\u9577\u5927\u306a\u898f\u5247\u306b\u306a\u3063\u3066\u3044\u308b\u3068\u3001\u3053\u3053\u3082\u3059\u3054\u3044\u5927\u304d\u3044\u7121\u99c4\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u8d64\u5b57\u306e\u90e8\u5206\u306f\u5fc5\u305a\u4ed8\u3044\u3066\u3057\u307e\u3046\u7121\u99c4\u3067\u3059\u304b\u3089\u3001\u5b9f\u969b\u7684\u306a\u7c21\u6613\u306a\u5bfe\u5fdc\u306f\u3001\u51fa\u6765\u305f\u69cb\u6587\u89e3\u6790\u6728\u3092\u5208\u308a\u8fbc\u3093\u3067\u3057\u307e\u3046\u3068\u3044\u3046\u624b\u3060\u3068\u601d\u3044\u307e\u3059\u3002\u69cb\u6587\u89e3\u6790\u6728\u3092\u4f5c\u3063\u305f\u306a\u3089\u3001\u305d\u308c\u3092\u4f7f\u3046\u30bf\u30a4\u30df\u30f3\u30b0\u304c\u3042\u308b\u306f\u305a\u3067\u3001\u305d\u306e\u624b\u524d\u3067\u884c\u3046\u3068\u3044\u3046\u3068\u3053\u308d\u3067\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
esrap-peg \u56fa\u6709\u3068\u3044\u3046\u3088\u308a PEG \u306e\u6027\u8cea\u3067\u3059\u304c\u3001\u4f8b\u3048\u3070\u672b\u5c3e\u304c ‘r’ \u306a\u5c0f\u6587\u5b57\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u5217\u304c\u53d7\u7406\u3055\u308c\u308b\u30d1\u30fc\u30b5\u3092\u5b9a\u7fa9\u3057\u3088\u3046\u3068\u3057\u3066\u3001Yacc \u3068\u540c\u69d8: G <- foo bar f … \u7d9a\u304d\u3092\u8aad\u3080