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annotate core/src/luan/impl/$Luan.java @ 650:d658eab7bf4c

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finish compiling operators
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 31 Mar 2016 22:43:51 -0600
parents 37f0cf43f191
children 140cc5191b7a
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rev   line source
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1 package luan.impl;
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2
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3 import java.util.Arrays;
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4 import java.util.List;
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5 import java.util.ArrayList;
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6 import luan.Luan;
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7 import luan.LuanState;
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8 import luan.LuanTable;
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9 import luan.LuanFunction;
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10 import luan.LuanException;
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11
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12
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13 public final class $Luan {
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14 private $Luan() {} // never
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15
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16
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17 private static List<Expressions> listExpressions = new ArrayList<Expressions>();
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18
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19 static int addExpressions(Expressions exp) {
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20 int i = listExpressions.size();
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21 listExpressions.add(exp);
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22 return i;
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23 }
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24
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25 public static Expressions getExpressions(int i) {
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26 return listExpressions.get(i);
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27 }
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28
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29
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30 public static Object first(Object obj) {
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31 return Luan.first(obj);
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32 }
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33
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34 public static int len(LuanState luan,Object o) throws LuanException {
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35 if( o instanceof String ) {
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36 String s = (String)o;
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37 return s.length();
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38 }
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39 if( o instanceof byte[] ) {
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40 byte[] a = (byte[])o;
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41 return a.length;
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42 }
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43 if( o instanceof LuanTable ) {
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44 LuanTable t = (LuanTable)o;
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45 return t.length(luan);
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46 }
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47 throw new LuanException( "attempt to get length of a " + Luan.type(o) + " value" );
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48 }
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49
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50 public static Object unm(LuanState luan,Object o) throws LuanException {
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51 if( o instanceof Number )
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52 return -((Number)o).doubleValue();
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53 if( o instanceof LuanTable ) {
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54 LuanFunction fn = Luan.getHandlerFunction("__unm",(LuanTable)o);
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55 if( fn != null ) {
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56 return Luan.first(fn.call(luan,new Object[]{o}));
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57 }
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58 }
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59 throw new LuanException("attempt to perform arithmetic on a "+Luan.type(o)+" value");
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60 }
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61
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62 public static boolean not(Object o) throws LuanException {
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63 return !Luan.checkBoolean(o);
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64 }
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65
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66 private static Object arithmetic(LuanState luan,String op,Object o1,Object o2) throws LuanException {
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67 LuanFunction fn = Luan.getBinHandler(op,o1,o2);
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68 if( fn != null )
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69 return Luan.first(fn.call(luan,new Object[]{o1,o2}));
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70 String type = !(o1 instanceof Number) ? Luan.type(o1) : Luan.type(o2);
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71 throw new LuanException("attempt to perform arithmetic on a "+type+" value");
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72 }
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73
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74 public static Object pow(LuanState luan,Object o1,Object o2) throws LuanException {
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75 if( o1 instanceof Number && o2 instanceof Number )
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76 return Math.pow( ((Number)o1).doubleValue(), ((Number)o2).doubleValue() );
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77 return arithmetic(luan,"__pow",o1,o2);
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78 }
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79
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80 public static Object mul(LuanState luan,Object o1,Object o2) throws LuanException {
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81 if( o1 instanceof Number && o2 instanceof Number )
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82 return ((Number)o1).doubleValue() * ((Number)o2).doubleValue();
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83 return arithmetic(luan,"__mul",o1,o2);
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84 }
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85
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86 public static Object div(LuanState luan,Object o1,Object o2) throws LuanException {
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87 if( o1 instanceof Number && o2 instanceof Number )
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88 return ((Number)o1).doubleValue() / ((Number)o2).doubleValue();
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89 return arithmetic(luan,"__div",o1,o2);
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90 }
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91
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92 public static Object mod(LuanState luan,Object o1,Object o2) throws LuanException {
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93 if( o1 instanceof Number && o2 instanceof Number ) {
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94 double d1 = ((Number)o1).doubleValue();
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95 double d2 = ((Number)o2).doubleValue();
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96 return d1 - Math.floor(d1/d2)*d2;
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97 }
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98 return arithmetic(luan,"__mod",o1,o2);
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99 }
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100
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101 public static Object add(LuanState luan,Object o1,Object o2) throws LuanException {
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102 if( o1 instanceof Number && o2 instanceof Number )
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103 return ((Number)o1).doubleValue() + ((Number)o2).doubleValue();
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104 return arithmetic(luan,"__add",o1,o2);
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105 }
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106
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107 public static Object sub(LuanState luan,Object o1,Object o2) throws LuanException {
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108 if( o1 instanceof Number && o2 instanceof Number )
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109 return ((Number)o1).doubleValue() - ((Number)o2).doubleValue();
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110 return arithmetic(luan,"__sub",o1,o2);
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111 }
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112
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113 public static Object concat(LuanState luan,Object o1,Object o2) throws LuanException {
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114 LuanFunction fn = Luan.getBinHandler("__concat",o1,o2);
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115 if( fn != null )
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116 return Luan.first(fn.call(luan,new Object[]{o1,o2}));
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117 String s1 = luan.toString(o1);
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118 String s2 = luan.toString(o2);
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119 return s1 + s2;
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120 }
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121
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122 public static boolean eq(LuanState luan,Object o1,Object o2) throws LuanException {
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123 if( o1 == o2 || o1 != null && o1.equals(o2) )
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124 return true;
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125 if( o1 instanceof Number && o2 instanceof Number ) {
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126 Number n1 = (Number)o1;
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127 Number n2 = (Number)o2;
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128 return n1.doubleValue() == n2.doubleValue();
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129 }
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130 if( o1 instanceof byte[] && o2 instanceof byte[] ) {
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131 byte[] b1 = (byte[])o1;
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132 byte[] b2 = (byte[])o2;
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133 return Arrays.equals(b1,b2);
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134 }
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135 if( !(o1 instanceof LuanTable && o2 instanceof LuanTable) )
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136 return false;
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137 LuanTable t1 = (LuanTable)o1;
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138 LuanTable t2 = (LuanTable)o2;
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139 LuanTable mt1 = t1.getMetatable();
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140 LuanTable mt2 = t2.getMetatable();
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141 if( mt1==null || mt2==null )
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142 return false;
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143 Object f = mt1.rawGet("__eq");
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144 if( f == null || !f.equals(mt2.rawGet("__eq")) )
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145 return false;
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146 LuanFunction fn = Luan.checkFunction(f);
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147 return Luan.checkBoolean( Luan.first(fn.call(luan,new Object[]{o1,o2})) );
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148 }
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149
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150 public static boolean le(LuanState luan,Object o1,Object o2) throws LuanException {
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151 if( o1 instanceof Number && o2 instanceof Number ) {
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152 Number n1 = (Number)o1;
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153 Number n2 = (Number)o2;
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154 return n1.doubleValue() <= n2.doubleValue();
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155 }
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156 if( o1 instanceof String && o2 instanceof String ) {
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157 String s1 = (String)o1;
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158 String s2 = (String)o2;
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159 return s1.compareTo(s2) <= 0;
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160 }
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161 LuanFunction fn = Luan.getBinHandler("__le",o1,o2);
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162 if( fn != null )
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163 return Luan.checkBoolean( Luan.first(fn.call(luan,new Object[]{o1,o2})) );
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164 fn = Luan.getBinHandler("__lt",o1,o2);
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165 if( fn != null )
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166 return !Luan.checkBoolean( Luan.first(fn.call(luan,new Object[]{o2,o1})) );
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167 throw new LuanException( "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) );
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168 }
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169
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170 public static boolean lt(LuanState luan,Object o1,Object o2) throws LuanException {
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171 return Luan.isLessThan(luan,o1,o2);
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172 }
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173
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174 public static boolean cnd(Object o) throws LuanException {
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175 return !(o == null || Boolean.FALSE.equals(o));
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176 }
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177
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178 }