annotate core/src/luan/modules/BasicLuan.java @ 326:db37d6aee4db

remove try-catch statement; add Luan.try() and Luan.pcall(); git-svn-id: https://luan-java.googlecode.com/svn/trunk@327 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 19 Mar 2015 00:01:57 +0000
parents a74559240b4f
children 62b457c50594
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 package luan.modules;
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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 luan.Luan;
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11 import luan.LuanState;
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12 import luan.LuanTable;
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13 import luan.LuanFunction;
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14 import luan.LuanJavaFunction;
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15 import luan.LuanException;
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16 import luan.LuanSource;
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17 import luan.LuanElement;
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18 import luan.LuanMethod;
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19 import luan.impl.LuanCompiler;
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22 public final class BasicLuan {
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24 public static String type(Object obj) {
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25 return Luan.type(obj);
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26 }
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28 public static LuanFunction load(LuanState luan,String text,String sourceName,LuanTable env,Boolean allowExpr)
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29 throws LuanException
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30 {
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31 if( allowExpr==null )
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32 allowExpr = false;
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33 return LuanCompiler.compile(luan,new LuanSource(sourceName,text),env,allowExpr);
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34 }
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35
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36 public static LuanFunction load_file(LuanState luan,String fileName,LuanTable env) throws LuanException {
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37 if( fileName == null )
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38 fileName = "stdin:";
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39 String src = PackageLuan.read(luan,fileName);
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40 if( src == null )
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41 throw luan.exception( "file '"+fileName+"' not found" );
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42 return load(luan,src,fileName,env,false);
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43 }
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44
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45 public static Object do_file(LuanState luan,String fileName) throws LuanException {
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46 LuanFunction fn = load_file(luan,fileName,null);
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47 return luan.call(fn);
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48 }
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49
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50 public static LuanFunction pairs(LuanState luan,final LuanTable t) throws LuanException {
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51 Utils.checkNotNull(luan,t);
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52 return new LuanFunction() {
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53 Iterator<Map.Entry<Object,Object>> iter = t.iterator();
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54
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55 @Override public Object[] call(LuanState luan,Object[] args) {
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56 if( !iter.hasNext() )
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57 return LuanFunction.NOTHING;
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58 Map.Entry<Object,Object> entry = iter.next();
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59 return new Object[]{entry.getKey(),entry.getValue()};
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60 }
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61 };
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62 }
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63
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64 public static LuanFunction ipairs(LuanState luan,final LuanTable t) throws LuanException {
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65 Utils.checkNotNull(luan,t);
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66 return new LuanFunction() {
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67 List<Object> list = t.asList();
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68 int i = 0;
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69 final int size = list.size();
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70
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71 @Override public Object[] call(LuanState luan,Object[] args) {
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72 if( i >= size )
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73 return LuanFunction.NOTHING;
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74 Object val = list.get(i++);
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75 return new Object[]{i,val};
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76 }
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77 };
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78 }
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79
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80 public static LuanTable get_metatable(LuanState luan,Object obj) {
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81 return luan.getMetatable(obj);
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82 }
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83
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84 public static LuanTable set_metatable(LuanTable table,LuanTable metatable) {
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85 table.setMetatable(metatable);
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86 return table;
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87 }
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88
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89 public static boolean raw_equal(Object v1,Object v2) {
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90 return v1 == v2 || v1 != null && v1.equals(v2);
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91 }
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92
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93 public static Object raw_get(LuanTable table,Object index) {
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94 return table.get(index);
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95 }
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96
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97 public static LuanTable raw_set(LuanTable table,Object index,Object value) {
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98 table.put(index,value);
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99 return table;
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100 }
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101
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102 public static int raw_len(LuanState luan,Object v) throws LuanException {
36
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103 if( v instanceof String ) {
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104 String s = (String)v;
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105 return s.length();
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106 }
48
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107 if( v instanceof LuanTable ) {
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108 LuanTable t = (LuanTable)v;
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109 return t.length();
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110 }
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111 throw luan.exception( "bad argument #1 to 'raw_len' (table or string expected)" );
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112 }
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113
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114 public static Number to_number(Object e,Integer base) {
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115 return Luan.toNumber(e,base);
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116 }
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117
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118 public static String to_string(LuanState luan,Object v) throws LuanException {
130
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119 return luan.toString(v);
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120 }
41
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121
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122 public static boolean to_boolean(Object v) throws LuanException {
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123 return Luan.toBoolean(v);
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124 }
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125
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126 public static void error(LuanState luan,Object msg) throws LuanException {
130
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127 throw luan.exception(msg);
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128 }
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129
64
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130 public static Object assert_(LuanState luan,Object v,String msg) throws LuanException {
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131 if( Luan.toBoolean(v) )
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132 return v;
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133 if( msg == null )
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134 msg = "assertion failed!";
130
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135 throw luan.exception( msg );
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136 }
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137
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138 public static String assert_string(LuanState luan,String v) throws LuanException {
251
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139 Utils.checkNotNull(luan,v);
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140 return v;
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141 }
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142
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143 public static Number assert_number(LuanState luan,Number v) throws LuanException {
251
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144 Utils.checkNotNull(luan,v);
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145 return v;
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146 }
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147
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148 public static LuanTable assert_table(LuanState luan,LuanTable v) throws LuanException {
251
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149 Utils.checkNotNull(luan,v);
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150 return v;
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151 }
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152
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153 public static boolean assert_boolean(LuanState luan,boolean v) throws LuanException {
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154 return v;
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155 }
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156
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157 public static Object assert_nil(LuanState luan,Object v) throws LuanException {
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158 if( v != null )
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159 throw luan.exception("bad argument #1 (nil expected, got "+Luan.type(v)+")");
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160 return v;
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161 }
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162
233
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163 public static int assert_integer(LuanState luan,int v) throws LuanException {
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164 return v;
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165 }
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166
290
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167 public static long assert_long(LuanState luan,long v) throws LuanException {
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168 return v;
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169 }
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170
88
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171 public static String repr(LuanState luan,Object v) throws LuanException {
130
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172 return luan.repr(v);
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173 }
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174
109
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175 public static LuanFunction range(LuanState luan,final double from,final double to,Double stepV) throws LuanException {
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176 final double step = stepV==null ? 1.0 : stepV;
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177 if( step == 0.0 )
130
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178 throw luan.exception("bad argument #3 (step may not be zero)");
109
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179 return new LuanFunction() {
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180 double v = from;
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181
112
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182 @Override public Object call(LuanState luan,Object[] args) {
109
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183 if( step > 0.0 && v > to || step < 0.0 && v < to )
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184 return LuanFunction.NOTHING;
109
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185 double rtn = v;
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186 v += step;
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187 return rtn;
109
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188 }
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189 };
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190 }
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191
116
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192 public static LuanFunction values(final Object... args) throws LuanException {
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193 return new LuanFunction() {
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194 int i = 0;
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195
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196 @Override public Object call(LuanState luan,Object[] unused) {
128
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197 if( ++i > args.length )
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198 return LuanFunction.NOTHING;
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199 return new Object[]{i,args[i-1]};
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200 }
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201 };
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202 }
143
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203
326
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204 private LuanFunction fn(Object obj) {
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205 return obj instanceof LuanFunction ? (LuanFunction)obj : null;
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206 }
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207
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208 public static void try_(LuanState luan,LuanTable blocks) throws LuanException {
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209 Utils.checkNotNull(luan,blocks);
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210 Object obj = blocks.get(1);
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211 if( obj == null )
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212 throw luan.exception("missing 'try' value");
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213 if( !(obj instanceof LuanFunction) )
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214 throw luan.exception("bad 'try' value (function expected, got "+Luan.type(obj)+")");
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215 LuanFunction tryFn = (LuanFunction)obj;
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216 LuanFunction catchFn = null;
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217 obj = blocks.get("catch");
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218 if( obj != null ) {
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219 if( !(obj instanceof LuanFunction) )
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220 throw luan.exception("bad 'catch' value (function expected, got "+Luan.type(obj)+")");
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221 catchFn = (LuanFunction)obj;
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222 }
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223 LuanFunction finallyFn = null;
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224 obj = blocks.get("finally");
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225 if( obj != null ) {
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226 if( !(obj instanceof LuanFunction) )
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227 throw luan.exception("bad 'finally' value (function expected, got "+Luan.type(obj)+")");
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228 finallyFn = (LuanFunction)obj;
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229 }
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230 try {
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231 luan.call(tryFn);
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232 } catch(LuanException e) {
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233 if( catchFn == null )
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234 throw e;
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235 luan.call(catchFn,new Object[]{e});
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236 } finally {
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237 if( finallyFn != null )
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238 luan.call(finallyFn);
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239 }
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240 }
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241
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242 @LuanMethod public static Object[] pcall(LuanState luan,LuanFunction f,Object... args) {
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243 try {
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244 Object[] r = Luan.array(luan.call(f,args));
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245 Object[] rtn = new Object[r.length+1];
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246 rtn[0] = true;
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247 for( int i=0; i<r.length; i++ ) {
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248 rtn[i+1] = r[i];
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249 }
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250 return rtn;
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251 } catch(LuanException e) {
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252 return new Object[]{false,e};
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253 }
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254 }
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255
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256 }