Mercurial Hosting > luan
annotate src/luan/Luan.java @ 111:2428ecfed375
change LuanFunction.call() from returning Object[] to returning Object, to reduce garbage collection
git-svn-id: https://luan-java.googlecode.com/svn/trunk@112 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Fri, 23 May 2014 20:40:05 +0000 |
parents | a9560839104d |
children | 8c706d6eb5dc |
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 |
66
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minor toString() improvement
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4 public final class Luan { |
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5 public static final String version = "Luan 0.1"; |
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6 |
111
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change LuanFunction.call() from returning Object[] to returning Object, to reduce garbage collection
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7 public static Object first(Object obj) { |
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change LuanFunction.call() from returning Object[] to returning Object, to reduce garbage collection
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8 if( !(obj instanceof Object[]) ) |
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9 return obj; |
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10 Object[] a = (Object[])obj; |
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11 return a.length==0 ? null : a[0]; |
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change LuanFunction.call() from returning Object[] to returning Object, to reduce garbage collection
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12 } |
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change LuanFunction.call() from returning Object[] to returning Object, to reduce garbage collection
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13 |
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change LuanFunction.call() from returning Object[] to returning Object, to reduce garbage collection
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14 public static Object[] array(Object obj) { |
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15 return obj instanceof Object[] ? (Object[])obj : new Object[]{obj}; |
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16 } |
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change LuanFunction.call() from returning Object[] to returning Object, to reduce garbage collection
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17 |
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18 public static String type(Object obj) { |
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19 if( obj == null ) |
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20 return "nil"; |
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21 if( obj instanceof String ) |
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22 return "string"; |
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23 if( obj instanceof Boolean ) |
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24 return "boolean"; |
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25 if( obj instanceof Number ) |
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26 return "number"; |
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27 if( obj instanceof LuanTable ) |
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28 return "table"; |
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29 if( obj instanceof LuanFunction ) |
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30 return "function"; |
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31 return "userdata"; |
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32 } |
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33 |
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34 public static boolean toBoolean(Object obj) { |
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35 return obj != null && !Boolean.FALSE.equals(obj); |
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36 } |
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37 |
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38 public static String asString(Object obj) { |
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39 if( obj instanceof String ) |
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40 return (String)obj; |
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41 if( obj instanceof Number ) |
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42 return toString((Number)obj); |
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43 return null; |
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44 } |
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45 |
46
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46 public static Number toNumber(Object obj) { |
36
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47 return toNumber(obj,null); |
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48 } |
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49 |
46
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50 public static Number toNumber(Object obj,Integer base) { |
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51 if( obj instanceof Number ) |
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52 return (Number)obj; |
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53 if( obj instanceof String ) { |
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54 String s = (String)obj; |
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55 try { |
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56 if( base==null ) |
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57 return Double.valueOf(s); |
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58 else |
46
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59 return Long.valueOf(s,base); |
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60 } catch(NumberFormatException e) {} |
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61 } |
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62 return null; |
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63 } |
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64 |
46
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65 public static String toString(Number n) { |
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66 if( n instanceof Integer ) |
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67 return n.toString(); |
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68 String s = n.toString(); |
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69 int iE = s.indexOf('E'); |
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70 String ending = null; |
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71 if( iE != -1 ) { |
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72 ending = s.substring(iE); |
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73 s = s.substring(0,iE); |
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74 } |
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75 if( s.endsWith(".0") ) |
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76 s = s.substring(0,s.length()-2); |
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77 if( ending != null ) |
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78 s += ending; |
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79 return s; |
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80 } |
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81 |
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82 public static Integer asInteger(Object obj) { |
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83 if( obj instanceof Integer ) |
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84 return (Integer)obj; |
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85 if( !(obj instanceof Number) ) |
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86 return null; |
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87 Number n = (Number)obj; |
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88 int i = n.intValue(); |
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89 return i==n.doubleValue() ? Integer.valueOf(i) : null; |
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90 } |
66
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91 |
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92 public static String toString(Object obj) { |
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93 if( obj == null ) |
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94 return "nil"; |
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95 if( obj instanceof Number ) |
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96 return Luan.toString((Number)obj); |
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97 if( obj instanceof LuanException ) { |
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98 LuanException le = (LuanException)obj; |
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99 return le.getMessage(); |
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100 } |
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101 return obj.toString(); |
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102 } |
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103 |
88
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104 public static String stringEncode(String s) { |
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105 s = s.replace("\\","\\\\"); |
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106 s = s.replace("\u0007","\\a"); |
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107 s = s.replace("\b","\\b"); |
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108 s = s.replace("\f","\\f"); |
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109 s = s.replace("\n","\\n"); |
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110 s = s.replace("\r","\\r"); |
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111 s = s.replace("\t","\\t"); |
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112 s = s.replace("\u000b","\\v"); |
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113 s = s.replace("\"","\\\""); |
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114 return s; |
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115 } |
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116 |
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117 public static String repr(Object obj) { |
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118 if( obj == null ) |
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119 return "nil"; |
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120 if( obj instanceof Number ) |
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121 return Luan.toString((Number)obj); |
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122 if( obj instanceof String ) |
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123 return "\"" + stringEncode((String)obj) + "\""; |
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124 if( obj instanceof LuanRepr ) |
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125 return ((LuanRepr)obj).repr(); |
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126 return null; |
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127 } |
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128 |
66
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129 private Luan() {} // never |
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130 } |