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annotate src/luan/Luan.java @ 1166:7ef40e1923b7

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add back Thread.global allow metatables to have metatables
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 08 Feb 2018 02:22:51 -0700
parents 1f9d34a6f308
children ce3279ef1bd9
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2df768b926aa start Luan
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan;
2df768b926aa start Luan
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2
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3 import java.util.List;
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4 import java.util.ArrayList;
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5 import java.util.Map;
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6 import java.util.LinkedHashMap;
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7 import java.util.Set;
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8 import java.util.Arrays;
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9 import java.util.Iterator;
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ebe9db183eb7 rename *Lib.java to *Luan.java
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10 import luan.modules.BasicLuan;
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11 import luan.modules.Utils;
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12 import luan.impl.LuanCompiler;
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13
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14
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15 public final class Luan {
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2df768b926aa start Luan
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16
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17 public static void main(String[] args) throws LuanException {
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18 LuanState luan = new LuanState();
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19 LuanFunction standalone = (LuanFunction)BasicLuan.load_file(luan,"classpath:luan/cmd_line.luan");
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20 standalone.call(luan,args);
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21 }
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22
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23 public static Object first(Object obj) {
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24 if( !(obj instanceof Object[]) )
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25 return obj;
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26 Object[] a = (Object[])obj;
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27 return a.length==0 ? null : a[0];
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28 }
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30 public static Object[] array(Object obj) {
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31 return obj instanceof Object[] ? (Object[])obj : new Object[]{obj};
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32 }
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33
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34 public static String type(Object obj) {
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35 if( obj == null )
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36 return "nil";
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2df768b926aa start Luan
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37 if( obj instanceof String )
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38 return "string";
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2df768b926aa start Luan
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39 if( obj instanceof Boolean )
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40 return "boolean";
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41 if( obj instanceof Number )
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42 return "number";
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43 if( obj instanceof LuanTable )
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44 return "table";
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45 if( obj instanceof LuanFunction )
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46 return "function";
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47 if( obj instanceof byte[] )
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48 return "binary";
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49 return "java";
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2df768b926aa start Luan
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50 }
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51
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52 public static String toString(Number n) {
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53 if( n instanceof Integer )
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54 return n.toString();
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55 int i = n.intValue();
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56 if( i == n.doubleValue() )
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57 return Integer.toString(i);
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58 String s = n.toString();
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59 int iE = s.indexOf('E');
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60 String ending = null;
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61 if( iE != -1 ) {
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62 ending = s.substring(iE);
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63 s = s.substring(0,iE);
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64 }
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65 if( s.endsWith(".0") )
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66 s = s.substring(0,s.length()-2);
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67 if( ending != null )
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68 s += ending;
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69 return s;
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70 }
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72 public static Integer asInteger(Object obj) {
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73 if( obj instanceof Integer )
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74 return (Integer)obj;
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75 if( !(obj instanceof Number) )
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76 return null;
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77 Number n = (Number)obj;
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78 int i = n.intValue();
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79 return i==n.doubleValue() ? Integer.valueOf(i) : null;
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80 }
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81
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82 public static String stringEncode(String s) {
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83 s = s.replace("\\","\\\\");
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84 s = s.replace("\u0007","\\a");
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85 s = s.replace("\b","\\b");
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86 s = s.replace("\f","\\f");
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87 s = s.replace("\n","\\n");
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88 s = s.replace("\r","\\r");
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89 s = s.replace("\t","\\t");
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90 s = s.replace("\u000b","\\v");
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91 s = s.replace("\"","\\\"");
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92 s = s.replace("\'","\\'");
88
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93 return s;
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94 }
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95
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96
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97 // from LuanState
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98
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99 public static Boolean checkBoolean(Object obj) throws LuanException {
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100 if( obj instanceof Boolean )
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101 return (Boolean)obj;
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102 throw new LuanException("attempt to use a " + Luan.type(obj) + " value as a boolean" );
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103 }
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104
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105 public static String checkString(Object obj) throws LuanException {
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106 if( obj instanceof String )
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107 return (String)obj;
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108 throw new LuanException("attempt to use a " + Luan.type(obj) + " value as a string" );
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109 }
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110
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111 public static LuanFunction checkFunction(Object obj) throws LuanException {
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112 if( obj instanceof LuanFunction )
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113 return (LuanFunction)obj;
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114 throw new LuanException("attempt to call a " + Luan.type(obj) + " value" );
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115 }
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116
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117 public static LuanFunction load(String text,String sourceName,LuanTable env)
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118 throws LuanException
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119 {
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120 return LuanCompiler.compile(text,sourceName,env);
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121 }
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122
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123 public static LuanFunction load(String text,String sourceName)
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124 throws LuanException
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125 {
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126 return load(text,sourceName,null);
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127 }
647
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128
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129
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130 public static Object toLuan(Object obj) throws LuanException {
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131 if( !type(obj).equals("java") )
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132 return obj;
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133 LuanTable tbl = new LuanTable();
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134 if( obj instanceof Map ) {
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135 Map map = (Map)obj;
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136 for( Object stupid : map.entrySet() ) {
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137 Map.Entry entry = (Map.Entry)stupid;
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138 Object key = entry.getKey();
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139 Object value = entry.getValue();
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140 if( key != null && value != null )
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141 tbl.rawPut(toLuan(key),toLuan(value));
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142 }
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143 return tbl;
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144 }
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145 if( obj instanceof Set ) {
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146 Set set = (Set)obj;
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147 for( Object el : set ) {
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148 if( el != null )
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149 tbl.rawPut(toLuan(el),Boolean.TRUE);
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150 }
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151 return tbl;
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152 }
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153 List list;
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154 if( obj instanceof List ) {
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155 list = (List)obj;
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156 } else {
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157 Class cls = obj.getClass();
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158 if( cls.isArray() && !cls.getComponentType().isPrimitive() ) {
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159 Object[] a = (Object[])obj;
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160 list = Arrays.asList(a);
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161 } else
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162 throw new LuanException("can't convert type "+obj.getClass().getName()+" to luan");
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163 }
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164 int n = list.size();
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165 for( int i=0; i<n; i++ ) {
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166 Object val = list.get(i);
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167 if( val != null )
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168 tbl.rawPut(i+1,toLuan(val));
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169 }
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170 return tbl;
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171 }
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172
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173 public static Object toJava(Object obj) throws LuanException {
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174 if( !(obj instanceof LuanTable) )
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175 return obj;
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176 LuanTable tbl = (LuanTable)obj;
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177 if( tbl.isList() ) {
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178 List list = new ArrayList();
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179 for( Object el : tbl.asList() ) {
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180 list.add( toJava(el) );
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181 }
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182 return list;
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183 } else {
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184 Map map = new LinkedHashMap();
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185 Iterator<Map.Entry> iter = tbl.rawIterator();
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186 while( iter.hasNext() ) {
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187 Map.Entry entry = iter.next();
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188 map.put( toJava(entry.getKey()), toJava(entry.getValue()) );
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189 }
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190 return map;
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191 }
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192 }
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193
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194 public static LuanTable table(LuanTable v) throws LuanException {
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195 Utils.checkNotNull(v);
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196 return v;
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197 }
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198
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199
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200 private Luan() {} // never
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201 }