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annotate src/luan/Luan.java @ 1113:22652f4020fb

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add JsonToString
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 02 Aug 2017 19:00:24 -0600
parents 1a68fc55a80c
children 1f9d34a6f308
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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.impl.LuanCompiler;
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14 public final class Luan {
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16 public static void main(String[] args) throws LuanException {
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17 LuanState luan = new LuanState();
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18 LuanFunction standalone = (LuanFunction)BasicLuan.load_file(luan,"classpath:luan/cmd_line.luan");
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19 standalone.call(luan,args);
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20 }
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21
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22 public static Object first(Object obj) {
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23 if( !(obj instanceof Object[]) )
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24 return obj;
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25 Object[] a = (Object[])obj;
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26 return a.length==0 ? null : a[0];
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27 }
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29 public static Object[] array(Object obj) {
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30 return obj instanceof Object[] ? (Object[])obj : new Object[]{obj};
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31 }
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33 public static String type(Object obj) {
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34 if( obj == null )
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35 return "nil";
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36 if( obj instanceof String )
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37 return "string";
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38 if( obj instanceof Boolean )
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39 return "boolean";
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40 if( obj instanceof Number )
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41 return "number";
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42 if( obj instanceof LuanTable )
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43 return "table";
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44 if( obj instanceof LuanFunction )
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45 return "function";
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46 if( obj instanceof byte[] )
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47 return "binary";
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48 return "java";
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49 }
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51 public static String toString(Number n) {
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52 if( n instanceof Integer )
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53 return n.toString();
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54 int i = n.intValue();
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55 if( i == n.doubleValue() )
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56 return Integer.toString(i);
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57 String s = n.toString();
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58 int iE = s.indexOf('E');
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59 String ending = null;
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60 if( iE != -1 ) {
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61 ending = s.substring(iE);
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62 s = s.substring(0,iE);
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63 }
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64 if( s.endsWith(".0") )
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65 s = s.substring(0,s.length()-2);
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66 if( ending != null )
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67 s += ending;
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68 return s;
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69 }
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70
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71 public static Integer asInteger(Object obj) {
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72 if( obj instanceof Integer )
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73 return (Integer)obj;
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74 if( !(obj instanceof Number) )
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75 return null;
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76 Number n = (Number)obj;
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77 int i = n.intValue();
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78 return i==n.doubleValue() ? Integer.valueOf(i) : null;
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79 }
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80
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81 public static String stringEncode(String s) {
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82 s = s.replace("\\","\\\\");
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83 s = s.replace("\u0007","\\a");
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84 s = s.replace("\b","\\b");
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85 s = s.replace("\f","\\f");
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86 s = s.replace("\n","\\n");
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87 s = s.replace("\r","\\r");
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88 s = s.replace("\t","\\t");
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89 s = s.replace("\u000b","\\v");
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90 s = s.replace("\"","\\\"");
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91 s = s.replace("\'","\\'");
88
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92 return s;
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93 }
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94
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95
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96 // from LuanState
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97
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98 public static Boolean checkBoolean(Object obj) throws LuanException {
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99 if( obj instanceof Boolean )
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100 return (Boolean)obj;
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101 throw new LuanException("attempt to use a " + Luan.type(obj) + " value as a boolean" );
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102 }
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103
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104 public static String checkString(Object obj) throws LuanException {
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105 if( obj instanceof String )
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106 return (String)obj;
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107 throw new LuanException("attempt to use a " + Luan.type(obj) + " value as a string" );
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108 }
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109
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110 public static LuanFunction checkFunction(Object obj) throws LuanException {
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111 if( obj instanceof LuanFunction )
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112 return (LuanFunction)obj;
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113 throw new LuanException("attempt to call a " + Luan.type(obj) + " value" );
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114 }
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115
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116 public static boolean isLessThan(LuanState luan,Object o1,Object o2) throws LuanException {
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117 if( o1 instanceof Number && o2 instanceof Number ) {
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118 Number n1 = (Number)o1;
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119 Number n2 = (Number)o2;
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120 return n1.doubleValue() < n2.doubleValue();
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121 }
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122 if( o1 instanceof String && o2 instanceof String ) {
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123 String s1 = (String)o1;
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124 String s2 = (String)o2;
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125 return s1.compareTo(s2) < 0;
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126 }
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127 LuanFunction fn = getBinHandler("__lt",o1,o2);
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128 if( fn != null )
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129 return checkBoolean( Luan.first(fn.call(luan,new Object[]{o1,o2})) );
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130 throw new LuanException( "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) );
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131 }
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132
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133 public static LuanFunction getBinHandler(String op,Object o1,Object o2) throws LuanException {
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134 if( o1 instanceof LuanTable ) {
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135 LuanFunction f1 = getHandlerFunction(op,(LuanTable)o1);
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136 if( f1 != null )
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137 return f1;
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138 }
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139 return o2 instanceof LuanTable ? getHandlerFunction(op,(LuanTable)o2) : null;
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140 }
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141
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142 public static LuanFunction getHandlerFunction(String op,LuanTable t) throws LuanException {
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143 Object f = t.getHandler(op);
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144 if( f == null )
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145 return null;
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146 return checkFunction(f);
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147 }
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148
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149 public static LuanFunction load(String text,String sourceName,LuanTable env)
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150 throws LuanException
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151 {
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152 return LuanCompiler.compile(text,sourceName,env);
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153 }
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154
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155 public static LuanFunction load(String text,String sourceName)
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156 throws LuanException
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157 {
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158 return load(text,sourceName,null);
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159 }
647
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160
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161
1113
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162 public static Object toLuan(Object obj) throws LuanException {
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163 if( !type(obj).equals("java") )
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164 return obj;
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165 LuanTable tbl = new LuanTable();
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166 if( obj instanceof Map ) {
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167 Map map = (Map)obj;
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168 for( Object stupid : map.entrySet() ) {
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169 Map.Entry entry = (Map.Entry)stupid;
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170 Object key = entry.getKey();
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171 Object value = entry.getValue();
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172 if( key != null && value != null )
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173 tbl.rawPut(toLuan(key),toLuan(value));
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174 }
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175 return tbl;
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176 }
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177 if( obj instanceof Set ) {
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178 Set set = (Set)obj;
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179 for( Object el : set ) {
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180 if( el != null )
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181 tbl.rawPut(toLuan(el),Boolean.TRUE);
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182 }
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183 return tbl;
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184 }
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185 List list;
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186 if( obj instanceof List ) {
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187 list = (List)obj;
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188 } else {
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189 Class cls = obj.getClass();
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190 if( cls.isArray() && !cls.getComponentType().isPrimitive() ) {
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191 Object[] a = (Object[])obj;
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192 list = Arrays.asList(a);
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193 } else
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194 throw new LuanException("can't convert type "+obj.getClass().getName()+" to luan");
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195 }
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196 int n = list.size();
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197 for( int i=0; i<n; i++ ) {
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198 Object val = list.get(i);
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199 if( val != null )
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200 tbl.rawPut(i+1,toLuan(val));
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201 }
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202 return tbl;
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203 }
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204
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205 public static Object toJava(Object obj) throws LuanException {
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206 if( !(obj instanceof LuanTable) )
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207 return obj;
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208 LuanTable tbl = (LuanTable)obj;
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209 if( tbl.isList() ) {
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210 List list = new ArrayList();
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211 for( Object el : tbl.asList() ) {
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212 list.add( toJava(el) );
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213 }
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214 return list;
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215 } else {
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216 Map map = new LinkedHashMap();
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217 Iterator<Map.Entry> iter = tbl.rawIterator();
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218 while( iter.hasNext() ) {
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219 Map.Entry entry = iter.next();
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220 map.put( toJava(entry.getKey()), toJava(entry.getValue()) );
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221 }
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222 return map;
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223 }
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224 }
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225
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226
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227 private Luan() {} // never
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228 }