Source Code Cross Referenced for callcc.java in  » Scripting » Kawa » kawa » standard » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » Kawa » kawa.standard 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package kawa.standard;
02:
03:        import kawa.lang.*;
04:        import gnu.mapping.*;
05:
06:        /**
07:         * Implement the Scheme standard function "call-with-current-continuation".
08:         * This is a restricted version, that only works for escape-like applications.
09:         * @author Per Bothner
10:         */
11:
12:        public class callcc extends MethodProc {
13:            public static final callcc callcc = new callcc();
14:
15:            public int numArgs() {
16:                return 0x1001;
17:            }
18:
19:            public int match1(Object proc, CallContext ctx) {
20:                if (!(proc instanceof  Procedure))
21:                    return NO_MATCH_BAD_TYPE;
22:                return super .match1(proc, ctx);
23:            }
24:
25:            public void apply(CallContext ctx) throws Throwable {
26:                Procedure proc = (Procedure) ctx.value1;
27:                Continuation cont = new Continuation(ctx);
28:                proc.check1(cont, ctx);
29:                proc = ctx.proc;
30:                ctx.proc = null;
31:                try {
32:                    proc.apply(ctx);
33:                    ctx.runUntilDone();
34:                } catch (CalledContinuation ex) {
35:                    if (ex.continuation != cont)
36:                        throw ex;
37:                    Object[] values = ex.values;
38:                    int nvalues = values.length;
39:                    for (int i = 0; i < nvalues; i++)
40:                        ctx.consumer.writeObject(ex.values[i]);
41:                } finally {
42:                    cont.invoked = true;
43:                }
44:            }
45:
46:            /*
47:            public void apply (CallContext stack)
48:            {
49:              kawa.lang.Continuation cont = new Continuation ();
50:              cont.frame = stack.proc;
51:              cont.pc = stack.pc;
52:              stack.value = cont;
53:            }
54:             */
55:        }
56:
57:        /*
58:         class Continuation extends MethodProc
59:         {
60:         Procedure frame;
61:         int pc;
62:
63:         public void apply (CallContext stack)
64:         {
65:         Object result = Values.make(stack.args);
66:         stack.pc = pc;
67:         stack.proc = frame;
68:         stack.result = result;
69:         }
70:         }
71:         */
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