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Java > Open Source Codes > gnu > kawa > xml > MakeText


1 // Copyright (c) 2003, 2004 Per M.A. Bothner
2 // This is free software; for terms and warranty disclaimer see ./COPYING.
3
4 package gnu.kawa.xml;
5 import gnu.mapping.*;
6 import gnu.lists.*;
7 import gnu.expr.*;
8 import gnu.bytecode.*;
9 import gnu.xml.*;
10
11 public class MakeText extends NodeConstructor
12 {
13   public static final MakeText makeText = new MakeText();
14
15   public int numArgs() { return 0x1001; }
16
17   public Object JavaDoc apply1 (Object JavaDoc arg)
18   {
19     if (arg == null || (arg instanceof Values && ((Values) arg).isEmpty()))
20       return arg;
21     NodeTree node = new NodeTree();
22     TextUtils.textValue(arg, new XMLFilter(node));
23     return KText.make(node);
24   }
25
26   public static void text$X (Object JavaDoc arg, CallContext ctx)
27   {
28     if (arg == null || (arg instanceof Values && ((Values) arg).isEmpty()))
29       return;
30     Consumer saved = ctx.consumer;
31     Consumer out = NodeConstructor.pushNodeContext(ctx);
32     try
33       {
34         TextUtils.textValue(arg, out);
35       }
36     finally
37       {
38     NodeConstructor.popNodeContext(saved, ctx);
39       }
40   }
41
42   public void apply (CallContext ctx)
43   {
44     text$X(ctx.getNextArg(null), ctx);
45   }
46
47   public void compile (ApplyExp exp, Compilation comp, Target target)
48   {
49     // We can't use NodeConstructor's compile method, because a node
50 // constructor may return a non-node when given an empty sequence. Sigh.
51 ApplyExp.compile(exp, comp, target);
52   }
53
54   public void compileToNode (ApplyExp exp, Compilation comp,
55                       ConsumerTarget target)
56   {
57     // This only gets called via NodeConstructor's compileChild.
58 CodeAttr code = comp.getCode();
59     Expression[] args = exp.getArgs();
60     Expression texp = args[0];
61     Variable cvar = target.getConsumerVariable();
62     if (texp instanceof QuoteExp)
63       {
64         Object JavaDoc tval = ((QuoteExp) texp).getValue();
65         if (tval instanceof String JavaDoc)
66           {
67             String JavaDoc str = (String JavaDoc) tval;
68             String JavaDoc segments = CodeAttr.calculateSplit(str);
69             int numSegments = segments.length();
70             ClassType ctype = (ClassType) cvar.getType();
71             Method writer = ctype.getMethod("write",
72                                             new Type[] { Type.string_type });
73             int segStart = 0;
74             for (int seg = 0; seg < numSegments; seg++)
75               {
76                 code.emitLoad(cvar);
77                 int segEnd = segStart + (int) segments.charAt(seg);
78                 code.emitPushString(str.substring(segStart, segEnd));
79                 code.emitInvoke(writer);
80                 segStart = segEnd;
81               }
82             return;
83           }
84       }
85     texp.compile(comp, Target.pushObject);
86     code.emitLoad(cvar);
87     code.emitInvokeStatic(ClassType.make("gnu.xml.TextUtils")
88                           .getDeclaredMethod("textValue", 2));
89   }
90 }
91
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