www.delorie.com/gnu/docs/guile/r5rs_75.html   search  
 
Buy GNU books!


Revised(5) Scheme

[ < ] [ > ]   [ << ] [ Up ] [ >> ]         [Top] [Contents] [Index] [ ? ]

7.1.3 Expressions

 
<expression> --> <variable>
     | <literal>
     | <procedure call>
     | <lambda expression>
     | <conditional>
     | <assignment>
     | <derived expression>
     | <macro use>
     | <macro block>

<literal> --> <quotation> | <self-evaluating>
<self-evaluating> --> <boolean> | <number>
     | <character> | <string>
<quotation> --> '<datum> | (quote <datum>)
<procedure call> --> (<operator> <operand>*)
<operator> --> <expression>
<operand> --> <expression>

<lambda expression> --> (lambda <formals> <body>)
<formals> --> (<variable>*) | <variable>
     | (<variable>+ . <variable>)
<body> --> <definition>* <sequence>
<sequence> --> <command>* <expression>
<command> --> <expression>

<conditional> --> (if <test> <consequent> <alternate>)
<test> --> <expression>
<consequent> --> <expression>
<alternate> --> <expression> | <empty>

<assignment> --> (set! <variable> <expression>)

<derived expression> -->
       (cond <cond clause>+)
     | (cond <cond clause>* (else <sequence>))
     | (case <expression>
         <case clause>+)
     | (case <expression>
         <case clause>*
         (else <sequence>))
     | (and <test>*)
     | (or <test>*)
     | (let (<binding spec>*) <body>)
     | (let <variable> (<binding spec>*) <body>)
     | (let* (<binding spec>*) <body>)
     | (letrec (<binding spec>*) <body>)
     | (begin <sequence>)
     | (do (<iteration spec>*)
           (<test> <do result>)
         <command>*)
     | (delay <expression>)
     | <quasiquotation>

<cond clause> --> (<test> <sequence>)
      | (<test>)
      | (<test> => <recipient>)
<recipient> --> <expression>
<case clause> --> ((<datum>*) <sequence>)
<binding spec> --> (<variable> <expression>)
<iteration spec> --> (<variable> <init> <step>)
    | (<variable> <init>)
<init> --> <expression>
<step> --> <expression>
<do result> --> <sequence> | <empty>

<macro use> --> (<keyword> <datum>*)
<keyword> --> <identifier>

<macro block> -->
     (let-syntax (<syntax spec>*) <body>)
     | (letrec-syntax (<syntax spec>*) <body>)
<syntax spec> --> (<keyword> <transformer spec>)




  webmaster     delorie software   privacy  
  Copyright 2003   by The Free Software Foundation     Updated Jun 2003