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annotate src/luan/interp/Utils.java @ 36:2a35154aec14

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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
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan.interp;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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3 import luan.Lua;
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4 import luan.LuaFunction;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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5 import luan.LuaTable;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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6 import luan.LuaException;
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9 final class Utils {
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10 private Utils() {} // never
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12 static Object first(Object[] a) {
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13 return a.length==0 ? null : a[0];
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14 }
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16 static final Object getHandler(String op,Object obj) throws LuaException {
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17 LuaTable t = Lua.getMetatable(obj);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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18 return t==null ? null : t.get(op);
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19 }
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21 static final LuaFunction getHandlerFunction(String op,Object obj) throws LuaException {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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22 Object f = getHandler(op,obj);
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23 if( f == null )
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24 return null;
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25 return Lua.checkFunction(f);
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26 }
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28 }