X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=prelude.js;h=b934132bfb9374a032fd4cb5ce020f7adb824f94;hb=3d960988cd3719466c60221eaa4df888e47b5d0e;hp=dab0484bbf740e924bff2d8632125c265968436e;hpb=69e2c35ff134e83845c79f77032259cc92890ce8;p=jscl.git

diff --git a/prelude.js b/prelude.js
index dab0484..b934132 100644
--- a/prelude.js
+++ b/prelude.js
@@ -1,4 +1,6 @@
-function pv (x) { return x ; }
+var nil;
+
+function pv (x) { return x==undefined? nil: x; }
 
 function mv(){
     var r = [];
@@ -8,6 +10,10 @@ function mv(){
     return r;
 }
 
+function forcemv (x) {
+    return typeof x == 'object' && 'multiple-value' in x? x: mv(x);
+}
+
 // NOTE: Define VALUES to be MV for toplevel forms. It is because
 // `eval' compiles the forms and execute the Javascript code at
 // toplevel with `js-eval', so it is necessary to return multiple
@@ -21,3 +27,22 @@ function checkArgsAtLeast(args, n){
 function checkArgsAtMost(args, n){
     if (args.length > n) throw 'too many arguments';
 }
+
+function checkArgs(args, n){
+    checkArgsAtLeast(args, n);
+    checkArgsAtMost(args, n);
+}
+
+// Improper list constructor (like LIST*)
+function QIList(){
+    if (arguments.length == 1)
+        return arguments[0];
+    else {
+        var i = arguments.length-1;
+        var r = arguments[i--];
+        for (; i>=0; i--){
+            r = {car: arguments[i], cdr: r};
+        }
+        return r;
+    }
+}