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annotate src/luan/modules/BasicLuan.java @ 1333:25746915a241

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merge Luan and LuanState
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 12 Feb 2019 22:33:40 -0700
parents f41919741100
children c88b486a9511
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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diff changeset
1 package luan.modules;
2
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3 import java.io.InputStreamReader;
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4 import java.io.IOException;
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5 import java.lang.reflect.Method;
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6 import java.util.Iterator;
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7 import java.util.Map;
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8 import java.util.List;
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9 import java.util.ArrayList;
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10 import java.util.Arrays;
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11 import luan.Luan;
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12 import luan.LuanTable;
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13 import luan.LuanFunction;
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14 import luan.LuanException;
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15 import luan.LuanMethod;
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16 import luan.modules.parsers.LuanToString;
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18
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19 public final class BasicLuan {
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21 public static String type(Object obj) {
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22 return Luan.type(obj);
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23 }
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25 public static LuanFunction load(String text,String sourceName,LuanTable env)
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26 throws LuanException
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27 {
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28 Utils.checkNotNull(text);
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29 Utils.checkNotNull(sourceName,1);
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30 return Luan.load(text,sourceName,env);
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31 }
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32
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33 public static LuanFunction load_file(Luan luan,String fileName) throws LuanException {
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34 if( fileName == null ) {
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35 fileName = "stdin:";
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36 } else if( fileName.indexOf(':') == -1 ) {
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37 fileName = "file:" + fileName;
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38 }
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39 String src = PackageLuan.read(luan,fileName);
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40 if( src == null )
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41 return null;
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42 return load(src,fileName,null);
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43 }
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44
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45 public static LuanFunction pairs(final LuanTable t) throws LuanException {
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46 Utils.checkNotNull(t);
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47 return t.pairs();
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48 }
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49
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50 public static LuanFunction ipairs(final LuanTable t) throws LuanException {
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51 Utils.checkNotNull(t);
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52 return new LuanFunction() {
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53 List<Object> list = t.asList();
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54 int i = 0;
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55 final int size = list.size();
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56
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57 @Override public Object[] call(Luan luan,Object[] args) {
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58 if( i >= size )
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59 return LuanFunction.NOTHING;
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60 Object val = list.get(i++);
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61 return new Object[]{i,val};
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62 }
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63 };
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64 }
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65
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66 public static Object get_metatable(LuanTable table) throws LuanException {
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67 Utils.checkNotNull(table);
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68 LuanTable metatable = table.getMetatable();
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69 if( metatable == null )
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70 return null;
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71 Object obj = metatable.rawGet("__metatable");
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72 return obj!=null ? obj : metatable;
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73 }
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74
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75 public static void set_metatable(LuanTable table,LuanTable metatable) throws LuanException {
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76 Utils.checkNotNull(table);
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77 if( table.getHandler("__metatable") != null )
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78 throw new LuanException("cannot change a protected metatable");
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79 table.setMetatable(metatable);
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80 }
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81
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82 public static boolean raw_equal(Object v1,Object v2) {
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83 return v1 == v2 || v1 != null && v1.equals(v2);
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84 }
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85
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86 public static Object raw_get(LuanTable table,Object index) {
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87 return table.rawGet(index);
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88 }
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89
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90 public static void raw_set(LuanTable table,Object index,Object value) throws LuanException {
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91 table.rawPut(index,value);
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92 }
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93
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94 public static int raw_len(Object v) throws LuanException {
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95 if( v instanceof String ) {
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96 String s = (String)v;
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97 return s.length();
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98 }
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99 if( v instanceof LuanTable ) {
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100 LuanTable t = (LuanTable)v;
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101 return t.rawLength();
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102 }
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103 throw new LuanException( "bad argument #1 to 'raw_len' (table or string expected)" );
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104 }
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105
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106 public static String to_string(Luan luan,Object v) throws LuanException {
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107 return luan.toString(v);
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108 }
41
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109
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110 public static LuanTable new_error(Luan luan,Object msg) throws LuanException {
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111 String s = luan.toString(msg);
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112 LuanTable tbl = new LuanException(s).table(luan);
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113 tbl.rawPut( "message", msg );
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114 return tbl;
41
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115 }
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116
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117 public static int assert_integer(int v) {
233
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118 return v;
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119 }
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120
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121 public static long assert_long(long v) {
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122 return v;
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123 }
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124
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125 public static double assert_double(double v) {
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126 return v;
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127 }
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128
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129 public static float assert_float(float v) {
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130 return v;
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131 }
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132
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133 public static LuanFunction range(final double from,final double to,Double stepV) throws LuanException {
109
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134 final double step = stepV==null ? 1.0 : stepV;
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135 if( step == 0.0 )
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136 throw new LuanException("bad argument #3 (step may not be zero)");
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137 return new LuanFunction() {
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138 double v = from;
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139
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140 @Override public Object call(Luan luan,Object[] args) {
109
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141 if( step > 0.0 && v > to || step < 0.0 && v < to )
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142 return LuanFunction.NOTHING;
109
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143 double rtn = v;
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144 v += step;
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145 return rtn;
109
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146 }
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147 };
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148 }
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149
116
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150 public static LuanFunction values(final Object... args) throws LuanException {
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151 return new LuanFunction() {
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152 int i = 0;
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153
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154 @Override public Object call(Luan luan,Object[] unused) {
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155 if( i >= args.length )
128
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156 return LuanFunction.NOTHING;
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157 Object val = args[i++];
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158 return new Object[]{i,val};
116
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159 }
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160 };
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161 }
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162
326
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163 private LuanFunction fn(Object obj) {
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164 return obj instanceof LuanFunction ? (LuanFunction)obj : null;
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165 }
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166
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167 public static Object try_(Luan luan,LuanTable blocks,Object... args) throws LuanException {
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168 Utils.checkNotNull(blocks);
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169 Object obj = blocks.get(1);
326
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170 if( obj == null )
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171 throw new LuanException("missing 'try' value");
326
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172 if( !(obj instanceof LuanFunction) )
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173 throw new LuanException("bad 'try' value (function expected, got "+Luan.type(obj)+")");
326
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174 LuanFunction tryFn = (LuanFunction)obj;
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175 LuanFunction catchFn = null;
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176 obj = blocks.get("catch");
326
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177 if( obj != null ) {
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178 if( !(obj instanceof LuanFunction) )
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179 throw new LuanException("bad 'catch' value (function expected, got "+Luan.type(obj)+")");
326
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180 catchFn = (LuanFunction)obj;
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181 }
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182 LuanFunction finallyFn = null;
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183 obj = blocks.get("finally");
326
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184 if( obj != null ) {
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185 if( !(obj instanceof LuanFunction) )
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186 throw new LuanException("bad 'finally' value (function expected, got "+Luan.type(obj)+")");
326
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187 finallyFn = (LuanFunction)obj;
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188 }
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189 try {
589
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190 return tryFn.call(luan,args);
326
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191 } catch(LuanException e) {
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192 if( catchFn == null )
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193 throw e;
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194 return catchFn.call(luan,new Object[]{e.table(luan)});
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195 } finally {
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196 if( finallyFn != null )
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197 finallyFn.call(luan);
326
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198 }
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199 }
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200
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diff changeset
201 @LuanMethod public static Object[] pcall(Luan luan,LuanFunction f,Object... args) {
326
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202 try {
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203 Object[] r = Luan.array(f.call(luan,args));
326
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204 Object[] rtn = new Object[r.length+1];
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205 rtn[0] = true;
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diff changeset
206 for( int i=0; i<r.length; i++ ) {
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207 rtn[i+1] = r[i];
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208 }
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209 return rtn;
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diff changeset
210 } catch(LuanException e) {
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211 return new Object[]{false,e.table(luan)};
326
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212 }
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213 }
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diff changeset
214
646
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diff changeset
215 public static String number_type(Number v) throws LuanException {
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diff changeset
216 Utils.checkNotNull(v);
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217 return v.getClass().getSimpleName().toLowerCase();
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218 }
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diff changeset
219
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diff changeset
220 public static int hash_code(Object obj) throws LuanException {
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221 if( obj == null ) {
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222 return 0;
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223 } else if( obj instanceof byte[] ) {
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224 return Arrays.hashCode((byte[])obj);
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225 } else {
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226 return obj.hashCode();
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227 }
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228 }
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229
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230 public static String stringify(Object obj,String strict) throws LuanException {
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231 boolean b;
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232 if( strict==null ) {
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233 b = false;
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234 } else if( strict.equals("strict") ) {
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235 b = true;
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236 } else {
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237 throw new LuanException("strict must be nil or 'strict'");
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238 }
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239 return LuanToString.toString(obj,b);
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240 }
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241
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242 private void BasicLuan() {} // never
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243 }