Mercurial Hosting > luan
annotate src/luan/Lua.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> |
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date | Tue, 18 Dec 2012 09:53:42 +0000 |
parents | e51906de0f11 |
children | 8a57ebfdfd78 |
rev | line source |
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1
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1 package luan; |
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2 |
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3 |
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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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6 |
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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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18 |
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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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22 |
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23 public static String asString(Object obj) { |
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24 if( obj instanceof String || obj instanceof LuaNumber ) |
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25 return obj.toString(); |
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26 return null; |
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27 } |
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28 |
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29 public static String checkString(Object obj) throws LuaException { |
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30 String s = asString(obj); |
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31 if( s == null ) |
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32 throw new LuaException( "attempt to use a " + Lua.type(obj) + " as a string" ); |
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33 return s; |
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34 } |
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35 |
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36 public static LuaNumber toNumber(Object obj) { |
36
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37 return toNumber(obj,null); |
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38 } |
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39 |
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40 public static LuaNumber toNumber(Object obj,Integer base) { |
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41 if( obj instanceof LuaNumber ) |
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42 return (LuaNumber)obj; |
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43 if( obj instanceof String ) { |
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44 String s = (String)obj; |
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45 try { |
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46 if( base==null ) |
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47 return new LuaNumber( Double.parseDouble(s) ); |
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48 else |
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49 return new LuaNumber( Long.parseLong(s,base) ); |
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50 } catch(NumberFormatException e) {} |
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51 } |
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52 return null; |
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53 } |
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54 |
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55 public static LuaNumber checkNumber(Object obj) throws LuaException { |
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56 LuaNumber n = toNumber(obj); |
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57 if( n == null ) |
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58 throw new LuaException( "attempt to perform arithmetic on a " + type(obj) + " value" ); |
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59 return n; |
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60 } |
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61 |
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62 public static LuaFunction checkFunction(Object obj) throws LuaException { |
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63 if( obj instanceof LuaFunction ) |
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64 return (LuaFunction)obj; |
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65 throw new LuaException( "attempt to call a " + type(obj) + " value" ); |
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66 } |
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67 |
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68 public static LuaTable getMetatable(Object obj) { |
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69 if( !(obj instanceof LuaTable) ) |
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70 return null; |
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71 LuaTable table = (LuaTable)obj; |
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72 return table.getMetatable(); |
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73 } |
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74 |
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75 } |