Mercurial Hosting > luan
annotate src/luan/Lua.java @ 46:a443637829c1
remove LuaNumber
git-svn-id: https://luan-java.googlecode.com/svn/trunk@47 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Thu, 27 Dec 2012 01:48:36 +0000 |
parents | 57054fa43189 |
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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 Number ) |
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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 ) |
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25 return (String)obj; |
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26 if( obj instanceof Number ) |
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27 return toString((Number)obj); |
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28 return null; |
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29 } |
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30 |
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31 public static Number toNumber(Object obj) { |
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32 return toNumber(obj,null); |
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33 } |
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34 |
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35 public static Number toNumber(Object obj,Integer base) { |
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36 if( obj instanceof Number ) |
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37 return (Number)obj; |
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38 if( obj instanceof String ) { |
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39 String s = (String)obj; |
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40 try { |
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41 if( base==null ) |
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42 return Double.valueOf(s); |
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43 else |
46
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44 return Long.valueOf(s,base); |
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45 } catch(NumberFormatException e) {} |
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46 } |
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47 return null; |
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48 } |
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49 |
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50 public static Object first(Object[] a) { |
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51 return a.length==0 ? null : a[0]; |
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52 } |
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53 |
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54 public static String toString(Number n) { |
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55 if( n instanceof Integer ) |
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56 return n.toString(); |
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57 String s = n.toString(); |
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58 int iE = s.indexOf('E'); |
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59 String ending = null; |
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60 if( iE != -1 ) { |
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61 ending = s.substring(iE); |
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62 s = s.substring(0,iE); |
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63 } |
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64 if( s.endsWith(".0") ) |
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65 s = s.substring(0,s.length()-2); |
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66 if( ending != null ) |
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67 s += ending; |
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68 return s; |
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69 } |
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70 |
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71 public static Integer asInteger(Object obj) { |
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72 if( obj instanceof Integer ) |
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73 return (Integer)obj; |
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74 if( !(obj instanceof Number) ) |
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75 return null; |
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76 Number n = (Number)obj; |
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77 int i = n.intValue(); |
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78 return i==n.doubleValue() ? Integer.valueOf(i) : null; |
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79 } |
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80 } |