Source Code Cross Referenced for define_alias.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.lists.*;
05:        import gnu.mapping.*;
06:        import gnu.expr.*;
07:        import gnu.bytecode.*;
08:
09:        public class define_alias extends Syntax {
10:            public static final define_alias define_alias = new define_alias();
11:            static {
12:                define_alias.setName("define-alias");
13:            }
14:
15:            public boolean scanForDefinitions(Pair st, java.util.Vector forms,
16:                    ScopeExp defs, Translator tr) {
17:                Object formCdr = st.cdr;
18:                SyntaxForm formSyntax = null;
19:                while (formCdr instanceof  SyntaxForm) {
20:                    formSyntax = (SyntaxForm) formCdr;
21:                    formCdr = formSyntax.form;
22:                }
23:                if (formCdr instanceof  Pair) {
24:                    Pair p = (Pair) formCdr;
25:                    SyntaxForm nameSyntax = formSyntax;
26:                    Object name = p.car;
27:                    while (name instanceof  SyntaxForm) {
28:                        nameSyntax = (SyntaxForm) name;
29:                        name = nameSyntax.form;
30:                    }
31:                    formCdr = p.cdr;
32:                    while (formCdr instanceof  SyntaxForm) {
33:                        formSyntax = (SyntaxForm) formCdr;
34:                        formCdr = formSyntax.form;
35:                    }
36:                    if ((name instanceof  String || name instanceof  Symbol)
37:                            && formCdr instanceof  Pair
38:                            && (p = (Pair) formCdr).cdr == LList.Empty) {
39:                        Declaration decl = tr.define(name, nameSyntax, defs);
40:                        decl.setIndirectBinding(true);
41:                        decl.setAlias(true);
42:                        Expression arg = tr.rewrite_car(p, formSyntax);
43:                        if (arg instanceof  ReferenceExp)
44:                            ((ReferenceExp) arg).setDontDereference(true);
45:                        else
46:                            arg = location.rewrite(arg, tr);
47:                        tr.mustCompileHere(); // For simplicity.
48:                        tr.push(decl);
49:                        SetExp sexp = new SetExp(decl, arg);
50:                        tr.setLineOf(sexp);
51:                        decl.noteValue(arg);
52:                        sexp.setDefining(true);
53:                        if (!(arg instanceof  ReferenceExp))
54:                            decl
55:                                    .setType(ClassType
56:                                            .make("gnu.mapping.Location"));
57:                        forms.addElement(sexp);
58:                        return true;
59:                    }
60:                }
61:                tr.error('e', "invalid syntax for define-alias");
62:                return false;
63:            }
64:
65:            public Expression rewrite(Object obj, Translator tr) {
66:                return tr
67:                        .syntaxError("define-alias is only allowed in a <body>");
68:            }
69:        }
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