对于syntax-rules(),The Scheme Programming Language 上面是这样描述的:While it is much less expressive than syntax-case, it is sufficient for defining many common syntactic extension。也就是说,它的表达能力是远弱于 syntax-case 的。syntax-case 在 r6rs 是标准实现所要求的,但是在 r7rs small 中被废除...
syntax-case是 define-syntax里面的另一种形式。 Kent Dybvig是 syntax-case的主要支持者，他有一个使用...
syntax-rules的能力是受限的,不能引入新的syntax-object,只能写一些简单的宏.但是用syntax-rules写出来的宏肯定比用syntax-case或define-macro写的更优雅. syntax-case完全不受限制,扩展能力与传统lisp宏(defmacro)是一样的,但由于它自带模式匹配功能,所以写起来会更方便,至少quasiquote,unquote,unquote-splicing少了很...
In this case, the indirect object comes right after the verb, and the direct object comes after the indirect object. Keep in mind that objects of prepositions do not follow this pattern; for example, you can say, The dog gave the ball to me. 6 Subject → verb → direct object → ...
“The girl loves the boy,” the subject is in initial position, and the object follows theverb. Transposing them changes the meaning. In many other languages, case markers indicate the grammatical relationships. InLatin, for example, “The girl loves the boy” may bepuella puerum amatwith ...
SMP/E input is case-sensitive. Use uppercase letters to enter all SMP/E keywords. Enter operands in the same case as the intended operand values. Enter the text within a comment in any case you prefer. Start each command on a new logical 80-byte record. ...
It can be anything ranging from printf to another switch-case ladder. Now, when we run our program, what happens first is the integer expression gets evaluated. The control then goes inside the switch and the value received from the integer expression is compared with the case constants. If ...
Python is case-sensitive.This includes variable names, function names, and pretty much anything else you can think of. A variable name ofmyvariableis not the same asMyVariable, and the functionspss.GetVariableCountcannot be written asSPSS.getvariablecount. ...
(syntax-case sintax () ((_ ((head2 . rest2) . rest) docstring body body* ...) (string? (syntax->datum #'docstring)) ;; Keep moving docstring to outermost lambda. #'(currying-name (head2 . rest2) docstring (lambda-name rest body body* ...))) ...
1. Editing and grammatical analysis Anyone who has carried out a grammatical analysis of a lengthy corpus of transcribed conversational speech will know that before such an analysis may be done, the data must be 'idealized'. The transcribed speech must be modified so that the utterances take ...