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annotate src/luan/Lua.java @ 35:e51906de0f11

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implement metatables git-svn-id: https://luan-java.googlecode.com/svn/trunk@36 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 18 Dec 2012 07:05:58 +0000
parents 8217d8485715
children 2a35154aec14
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan;
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4 public class Lua {
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5 public static final String version = "Luan 0.0";
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7 public static String type(Object obj) {
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8 if( obj == null )
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9 return "nil";
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10 if( obj instanceof String )
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11 return "string";
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12 if( obj instanceof Boolean )
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13 return "boolean";
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14 if( obj instanceof LuaNumber )
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15 return "number";
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16 return "userdata";
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17 }
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19 public static boolean toBoolean(Object obj) {
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20 return obj != null && !Boolean.FALSE.equals(obj);
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21 }
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23 public static String toString(Object obj) {
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24 if( obj == null )
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25 return "nil";
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26 return obj.toString();
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27 }
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29 public static String asString(Object obj) {
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30 if( obj instanceof String || obj instanceof LuaNumber )
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31 return obj.toString();
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32 return null;
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33 }
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35 public static String checkString(Object obj) throws LuaException {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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36 String s = asString(obj);
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37 if( s == null )
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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38 throw new LuaException( "attempt to use a " + Lua.type(obj) + " as a string" );
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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39 return s;
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40 }
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42 public static LuaNumber toNumber(Object obj) {
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43 if( obj instanceof LuaNumber )
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44 return (LuaNumber)obj;
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45 if( obj instanceof String ) {
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46 String s = (String)obj;
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47 try {
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48 return new LuaNumber( Double.parseDouble(s) );
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49 } catch(NumberFormatException e) {}
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50 }
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51 return null;
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52 }
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54 public static LuaNumber checkNumber(Object obj) throws LuaException {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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55 LuaNumber n = toNumber(obj);
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56 if( n == null )
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57 throw new LuaException( "attempt to perform arithmetic on a " + type(obj) + " value" );
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58 return n;
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59 }
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61 public static LuaFunction checkFunction(Object obj) throws LuaException {
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62 if( obj instanceof LuaFunction )
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63 return (LuaFunction)obj;
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64 throw new LuaException( "attempt to call a " + type(obj) + " value" );
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65 }
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67 public static LuaTable getMetatable(Object obj) {
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68 if( !(obj instanceof LuaTable) )
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69 return null;
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70 LuaTable table = (LuaTable)obj;
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71 return table.getMetatable();
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72 }
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74 }