Mercurial Hosting > luan
annotate core/src/luan/Luan.java @ 375:e2e70d27c258
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author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Fri, 17 Apr 2015 18:34:02 -0600 |
parents | 4fe6c9fed486 |
children | 8f1be9704726 |
rev | line source |
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1 package luan; |
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2 |
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3 import java.util.List; |
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4 import luan.modules.BasicLuan; |
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5 |
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6 |
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7 public final class Luan { |
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8 |
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9 public static void main(String[] args) { |
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10 LuanState luan = LuanState.newStandard(); |
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11 try { |
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12 LuanFunction standalone = (LuanFunction)BasicLuan.load_file(luan,"classpath:luan/cmd_line.luan",null); |
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13 luan.call(standalone,args); |
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14 } catch(LuanException e) { |
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15 System.err.println(e.getFullMessage()); |
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16 // e.printStackTrace(); |
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17 System.exit(-1); |
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18 } |
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19 } |
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20 |
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21 public static Object first(Object obj) { |
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22 if( !(obj instanceof Object[]) ) |
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23 return obj; |
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24 Object[] a = (Object[])obj; |
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25 return a.length==0 ? null : a[0]; |
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26 } |
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27 |
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28 public static Object[] array(Object obj) { |
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29 return obj instanceof Object[] ? (Object[])obj : new Object[]{obj}; |
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30 } |
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31 |
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32 public static String type(Object obj) { |
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33 if( obj == null ) |
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34 return "nil"; |
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35 if( obj instanceof String ) |
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36 return "string"; |
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37 if( obj instanceof Boolean ) |
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38 return "boolean"; |
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39 if( obj instanceof Number ) |
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40 return "number"; |
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41 if( obj instanceof LuanTable ) |
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42 return "table"; |
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43 if( obj instanceof LuanFunction ) |
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44 return "function"; |
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45 if( obj instanceof byte[] ) |
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46 return "binary"; |
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47 return "userdata"; |
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48 } |
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49 |
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50 public static boolean toBoolean(Object obj) { |
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51 return obj != null && !Boolean.FALSE.equals(obj); |
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52 } |
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53 |
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54 public static String asString(Object obj) { |
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55 if( obj instanceof String ) |
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56 return (String)obj; |
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57 if( obj instanceof Number ) |
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58 return toString((Number)obj); |
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59 return null; |
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60 } |
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61 |
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62 public static Number toNumber(Object obj) { |
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63 return toNumber(obj,null); |
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64 } |
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65 |
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66 public static Number toNumber(Object obj,Integer base) { |
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67 if( obj instanceof Number ) |
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68 return (Number)obj; |
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69 if( obj instanceof String ) { |
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70 String s = (String)obj; |
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71 try { |
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72 if( base==null ) |
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73 return Double.valueOf(s); |
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74 else |
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75 return Long.valueOf(s,base); |
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76 } catch(NumberFormatException e) {} |
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77 } |
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78 return null; |
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79 } |
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80 |
46
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81 public static String toString(Number n) { |
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82 if( n instanceof Integer ) |
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83 return n.toString(); |
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84 int i = n.intValue(); |
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85 if( i == n.doubleValue() ) |
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86 return Integer.toString(i); |
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87 String s = n.toString(); |
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88 int iE = s.indexOf('E'); |
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89 String ending = null; |
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90 if( iE != -1 ) { |
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91 ending = s.substring(iE); |
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92 s = s.substring(0,iE); |
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93 } |
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94 if( s.endsWith(".0") ) |
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95 s = s.substring(0,s.length()-2); |
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96 if( ending != null ) |
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97 s += ending; |
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98 return s; |
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99 } |
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100 |
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101 public static Integer asInteger(Object obj) { |
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102 if( obj instanceof Integer ) |
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103 return (Integer)obj; |
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104 if( !(obj instanceof Number) ) |
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105 return null; |
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106 Number n = (Number)obj; |
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107 int i = n.intValue(); |
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108 return i==n.doubleValue() ? Integer.valueOf(i) : null; |
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109 } |
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110 |
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111 public static String toString(Object obj) { |
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112 if( obj == null ) |
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113 return "nil"; |
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114 if( obj instanceof Number ) |
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115 return Luan.toString((Number)obj); |
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116 if( obj instanceof LuanException ) { |
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117 LuanException le = (LuanException)obj; |
201
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118 return le.getFullMessage(); |
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119 } |
113
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120 if( obj instanceof byte[] ) |
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121 return "binary: " + Integer.toHexString(obj.hashCode()); |
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122 return obj.toString(); |
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123 } |
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124 |
88
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125 public static String stringEncode(String s) { |
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126 s = s.replace("\\","\\\\"); |
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127 s = s.replace("\u0007","\\a"); |
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128 s = s.replace("\b","\\b"); |
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129 s = s.replace("\f","\\f"); |
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130 s = s.replace("\n","\\n"); |
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131 s = s.replace("\r","\\r"); |
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132 s = s.replace("\t","\\t"); |
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133 s = s.replace("\u000b","\\v"); |
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134 s = s.replace("\"","\\\""); |
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135 return s; |
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136 } |
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137 |
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138 public static String repr(Object obj) { |
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139 if( obj == null ) |
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140 return "nil"; |
147
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141 if( obj instanceof Boolean ) |
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142 return Luan.toString((Boolean)obj); |
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143 if( obj instanceof Number ) |
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144 return Luan.toString((Number)obj); |
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145 if( obj instanceof String ) |
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146 return "\"" + stringEncode((String)obj) + "\""; |
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147 if( obj instanceof LuanRepr ) |
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148 return ((LuanRepr)obj).repr(); |
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149 return null; |
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150 } |
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151 |
221
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152 public static LuanTable newTable() { |
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153 return new LuanTableImpl(); |
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154 } |
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155 |
318
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156 public static LuanTable newTable(List<Object> list) { |
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157 return new LuanTableImpl(list); |
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158 } |
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159 |
226
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160 public static LuanTable newPropertyTable() { |
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161 return new LuanPropertyTable(); |
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162 } |
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163 |
66
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164 private Luan() {} // never |
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165 } |