Mercurial Hosting > luan
annotate src/luan/Luan.java @ 775:1a68fc55a80c
simplify dir structure
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Fri, 26 Aug 2016 14:36:40 -0600 |
parents | core/src/luan/Luan.java@b620b8e1010f |
children | 22652f4020fb |
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 import java.util.List; |
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4 import luan.modules.BasicLuan; |
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5 import luan.impl.LuanCompiler; |
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6 |
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7 |
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8 public final class Luan { |
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9 |
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10 public static void main(String[] args) throws LuanException { |
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11 LuanState luan = new LuanState(); |
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12 LuanFunction standalone = (LuanFunction)BasicLuan.load_file(luan,"classpath:luan/cmd_line.luan"); |
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13 standalone.call(luan,args); |
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14 } |
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15 |
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16 public static Object first(Object obj) { |
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17 if( !(obj instanceof Object[]) ) |
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18 return obj; |
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19 Object[] a = (Object[])obj; |
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20 return a.length==0 ? null : a[0]; |
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21 } |
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22 |
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23 public static Object[] array(Object obj) { |
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24 return obj instanceof Object[] ? (Object[])obj : new Object[]{obj}; |
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25 } |
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26 |
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27 public static String type(Object obj) { |
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28 if( obj == null ) |
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29 return "nil"; |
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30 if( obj instanceof String ) |
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31 return "string"; |
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32 if( obj instanceof Boolean ) |
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33 return "boolean"; |
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34 if( obj instanceof Number ) |
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35 return "number"; |
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36 if( obj instanceof LuanTable ) |
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37 return "table"; |
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38 if( obj instanceof LuanFunction ) |
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39 return "function"; |
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40 if( obj instanceof byte[] ) |
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41 return "binary"; |
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42 return "java"; |
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43 } |
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44 |
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45 public static String toString(Number n) { |
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46 if( n instanceof Integer ) |
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47 return n.toString(); |
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48 int i = n.intValue(); |
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49 if( i == n.doubleValue() ) |
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50 return Integer.toString(i); |
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51 String s = n.toString(); |
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52 int iE = s.indexOf('E'); |
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53 String ending = null; |
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54 if( iE != -1 ) { |
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55 ending = s.substring(iE); |
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56 s = s.substring(0,iE); |
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57 } |
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58 if( s.endsWith(".0") ) |
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59 s = s.substring(0,s.length()-2); |
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60 if( ending != null ) |
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61 s += ending; |
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62 return s; |
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63 } |
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64 |
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65 public static Integer asInteger(Object obj) { |
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66 if( obj instanceof Integer ) |
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67 return (Integer)obj; |
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68 if( !(obj instanceof Number) ) |
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69 return null; |
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70 Number n = (Number)obj; |
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71 int i = n.intValue(); |
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72 return i==n.doubleValue() ? Integer.valueOf(i) : null; |
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73 } |
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74 |
88
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75 public static String stringEncode(String s) { |
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76 s = s.replace("\\","\\\\"); |
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77 s = s.replace("\u0007","\\a"); |
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78 s = s.replace("\b","\\b"); |
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79 s = s.replace("\f","\\f"); |
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80 s = s.replace("\n","\\n"); |
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81 s = s.replace("\r","\\r"); |
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82 s = s.replace("\t","\\t"); |
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83 s = s.replace("\u000b","\\v"); |
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84 s = s.replace("\"","\\\""); |
420 | 85 s = s.replace("\'","\\'"); |
88
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86 return s; |
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87 } |
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88 |
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89 |
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90 // from LuanState |
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91 |
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92 public static Boolean checkBoolean(Object obj) throws LuanException { |
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93 if( obj instanceof Boolean ) |
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94 return (Boolean)obj; |
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95 throw new LuanException("attempt to use a " + Luan.type(obj) + " value as a boolean" ); |
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96 } |
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97 |
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98 public static String checkString(Object obj) throws LuanException { |
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99 if( obj instanceof String ) |
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100 return (String)obj; |
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101 throw new LuanException("attempt to use a " + Luan.type(obj) + " value as a string" ); |
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102 } |
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103 |
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104 public static LuanFunction checkFunction(Object obj) throws LuanException { |
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105 if( obj instanceof LuanFunction ) |
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106 return (LuanFunction)obj; |
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107 throw new LuanException("attempt to call a " + Luan.type(obj) + " value" ); |
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108 } |
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109 |
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110 public static boolean isLessThan(LuanState luan,Object o1,Object o2) throws LuanException { |
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111 if( o1 instanceof Number && o2 instanceof Number ) { |
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112 Number n1 = (Number)o1; |
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113 Number n2 = (Number)o2; |
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114 return n1.doubleValue() < n2.doubleValue(); |
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115 } |
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116 if( o1 instanceof String && o2 instanceof String ) { |
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117 String s1 = (String)o1; |
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118 String s2 = (String)o2; |
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119 return s1.compareTo(s2) < 0; |
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120 } |
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121 LuanFunction fn = getBinHandler("__lt",o1,o2); |
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122 if( fn != null ) |
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123 return checkBoolean( Luan.first(fn.call(luan,new Object[]{o1,o2})) ); |
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124 throw new LuanException( "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) ); |
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125 } |
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126 |
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127 public static LuanFunction getBinHandler(String op,Object o1,Object o2) throws LuanException { |
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128 if( o1 instanceof LuanTable ) { |
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129 LuanFunction f1 = getHandlerFunction(op,(LuanTable)o1); |
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130 if( f1 != null ) |
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131 return f1; |
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132 } |
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133 return o2 instanceof LuanTable ? getHandlerFunction(op,(LuanTable)o2) : null; |
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134 } |
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135 |
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136 public static LuanFunction getHandlerFunction(String op,LuanTable t) throws LuanException { |
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137 Object f = t.getHandler(op); |
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138 if( f == null ) |
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139 return null; |
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140 return checkFunction(f); |
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141 } |
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142 |
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143 public static LuanFunction load(String text,String sourceName,LuanTable env) |
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144 throws LuanException |
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145 { |
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146 return LuanCompiler.compile(text,sourceName,env); |
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147 } |
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148 |
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149 public static LuanFunction load(String text,String sourceName) |
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150 throws LuanException |
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151 { |
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152 return load(text,sourceName,null); |
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153 } |
647
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154 |
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155 |
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156 private Luan() {} // never |
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157 } |