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1
29 package org.jruby.evaluator;
30
31 import org.jruby.Ruby;
32 import org.jruby.RubyArray;
33 import org.jruby.runtime.builtin.IRubyObject;
34
35
39 public final class ValueConverter {
40 private Ruby runtime;
41
42 public ValueConverter(Ruby runtime) {
43 this.runtime = runtime;
44 }
45
46 public RubyArray singleToArray(IRubyObject value) {
47 if (value == null || value.isNil()) {
48 return runtime.newArray(0);
49 } else if (value instanceof RubyArray) {
50 if (((RubyArray)value).getLength() == 1) {
51 return (RubyArray) value;
52 }
53 return runtime.newArray(value);
54 } else {
55 return toArray(value);
56 }
57 }
58
59 public IRubyObject arrayToSingle(IRubyObject value, boolean useUndefined) {
60 if (!(value instanceof RubyArray)) {
61 value = toArray(value);
62 }
63 switch (((RubyArray)value).getLength()) {
64 case 0:
65 return useUndefined ? null : runtime.getNil();
66 case 1:
67 return ((RubyArray)value).eltInternal(0);
68 default:
69 return value;
70 }
71 }
72
73 public RubyArray singleToMultiple(IRubyObject value) {
74 if (value == null || value.isNil()) {
75 return runtime.newArray(0);
76 } else if (value instanceof RubyArray) {
77 return (RubyArray) value;
78 } else {
79 return toArray(value);
80 }
81 }
82
83 public IRubyObject multipleToSingle(IRubyObject value) {
84 if (!(value instanceof RubyArray)) {
85 value = toArray(value);
86 }
87 switch (((RubyArray)value).getLength()) {
88 case 0:
89 return runtime.getNil();
90 case 1:
91 if (!(((RubyArray)value).eltInternal(0) instanceof RubyArray)) {
92 return ((RubyArray)value).eltInternal(0);
93 }
94 default:
95 return value;
96 }
97 }
98
99 private RubyArray toArray(IRubyObject value) {
100 if (value.isNil()) {
101 return runtime.newArray(0);
102 } else if (value instanceof RubyArray) {
103 return (RubyArray)value;
104 }
105 if (value.respondsTo("to_ary")) {
106 return (RubyArray)value.convertType(RubyArray.class, "Array", "to_ary");
107 }
108 return runtime.newArray(value);
109 }
110 }
111 |
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