Mercurial Hosting > luan
annotate src/luan/interp/LenExpr.java @ 36:2a35154aec14
implement more basic lib functions
git-svn-id: https://luan-java.googlecode.com/svn/trunk@37 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
---|---|
date | Tue, 18 Dec 2012 09:53:42 +0000 |
parents | e51906de0f11 |
children | 8a57ebfdfd78 |
rev | line source |
---|---|
2
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
1 package luan.interp; |
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
2 |
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
3 import luan.Lua; |
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
4 import luan.LuaNumber; |
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
5 import luan.LuaTable; |
35
e51906de0f11
implement metatables
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
31
diff
changeset
|
6 import luan.LuaFunction; |
2
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
7 import luan.LuaException; |
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
8 |
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
9 |
7
bca8fc5d928b
work on expressions
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
3
diff
changeset
|
10 final class LenExpr extends UnaryOpExpr { |
2
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
11 |
7
bca8fc5d928b
work on expressions
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
3
diff
changeset
|
12 LenExpr(Expr op) { |
2
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
13 super(op); |
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
14 } |
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
15 |
31
5cf15507d77e
separate interpreter from interface
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
11
diff
changeset
|
16 @Override public Object eval(LuaStateImpl lua) throws LuaException { |
35
e51906de0f11
implement metatables
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
31
diff
changeset
|
17 Object o = op.eval(lua); |
e51906de0f11
implement metatables
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
31
diff
changeset
|
18 if( o instanceof String ) { |
e51906de0f11
implement metatables
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
31
diff
changeset
|
19 String s = (String)o; |
e51906de0f11
implement metatables
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
31
diff
changeset
|
20 return new LuaNumber( s.length() ); |
2
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
21 } |
36
2a35154aec14
implement more basic lib functions
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
35
diff
changeset
|
22 LuaFunction fn = Utils.getHandlerFunction("__len",o); |
35
e51906de0f11
implement metatables
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
31
diff
changeset
|
23 if( fn != null ) |
e51906de0f11
implement metatables
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
31
diff
changeset
|
24 return Utils.first(fn.call(lua,o)); |
e51906de0f11
implement metatables
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
31
diff
changeset
|
25 if( o instanceof LuaTable ) { |
e51906de0f11
implement metatables
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
31
diff
changeset
|
26 LuaTable t = (LuaTable)o; |
2
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
27 return t.length(); |
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
28 } |
35
e51906de0f11
implement metatables
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
31
diff
changeset
|
29 throw new LuaException( "attempt to get length of a " + Lua.type(o) + " value" ); |
2
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
30 } |
4da26b11d12a
start interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff
changeset
|
31 } |