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() 是 nil, 展开时 look-ahead 判断(且长度为 0 的list 展开时会被展开为 nil) (但是, `( )` 就是空列表) (abcd_efg ) sexp 中第一项永远只能是 Symbol 或 sexp (sym_bol) ((symbol ()) ()) [[:symbol, []], nil] ('' ) `'` 到 `'` 之间的部分是 Symbol, 但如果括号中第三个字符(`'` 后面那个)是空白字符,`'` 视为普通符号 字符串语法: 'abc_defg "abc defg" 'abc_defg' "abc defg" (以 `'` 起始,以空白字符或 `'` `)` 终止,之间的 _ 视为空白字符) "abcdefg" "abcdefg" "abcdefg #{a}" (+ "abcdefg " a) "abcd #{b} efg" (+ "abcd " (+ b " efg")) (以 `"`起始,以 `"` 终止,之间支持 `#{}` 简写 ) 符号语法: :a (: a) :'abc' :abc :"abc" :abc 填充语法: #t true #f false #n nil #g 1 #e 0 #l -1 #h 新建 Hash 对象 #i 新建 List 对象(空 s-表达式) 数字语法: 032 434 23.2 0x1 0b1 0o1 0x123i32 0x32f64 数字以 0-9 起始,以空白字符或 ) 结束 表达式其他地方出现的任何不以 ' " 0-9 # : ( 开头的都作为符号,以空白字符或 ) 终止```
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