1 | /* |
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2 | * Ratio.java |
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3 | * |
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4 | * Copyright (C) 2003-2005 Peter Graves |
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5 | * $Id: Ratio.java 15569 2022-03-19 12:50:18Z mevenson $ |
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6 | * |
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7 | * This program is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU General Public License |
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9 | * as published by the Free Software Foundation; either version 2 |
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10 | * of the License, or (at your option) any later version. |
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11 | * |
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12 | * This program is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with this program; if not, write to the Free Software |
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19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 | * |
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21 | * As a special exception, the copyright holders of this library give you |
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22 | * permission to link this library with independent modules to produce an |
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23 | * executable, regardless of the license terms of these independent |
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24 | * modules, and to copy and distribute the resulting executable under |
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25 | * terms of your choice, provided that you also meet, for each linked |
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26 | * independent module, the terms and conditions of the license of that |
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27 | * module. An independent module is a module which is not derived from |
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28 | * or based on this library. If you modify this library, you may extend |
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29 | * this exception to your version of the library, but you are not |
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30 | * obligated to do so. If you do not wish to do so, delete this |
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31 | * exception statement from your version. |
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32 | */ |
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33 | |
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34 | package org.armedbear.lisp; |
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35 | |
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36 | import static org.armedbear.lisp.Lisp.*; |
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37 | |
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38 | import java.math.BigInteger; |
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39 | import java.math.BigDecimal; |
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40 | import java.math.MathContext; |
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41 | import java.math.RoundingMode; |
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42 | |
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43 | public final class Ratio extends LispObject |
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44 | { |
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45 | private BigInteger numerator; |
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46 | private BigInteger denominator; |
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47 | |
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48 | public Ratio(BigInteger numerator, BigInteger denominator) |
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49 | { |
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50 | this.numerator = numerator; |
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51 | this.denominator = denominator; |
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52 | } |
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53 | |
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54 | public BigInteger numerator() |
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55 | { |
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56 | return numerator; |
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57 | } |
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58 | |
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59 | @Override |
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60 | public LispObject NUMERATOR() |
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61 | { |
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62 | return number(numerator); |
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63 | } |
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64 | |
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65 | public BigInteger denominator() |
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66 | { |
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67 | return denominator; |
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68 | } |
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69 | |
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70 | @Override |
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71 | public LispObject DENOMINATOR() |
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72 | { |
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73 | return number(denominator); |
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74 | } |
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75 | |
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76 | @Override |
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77 | public LispObject typeOf() |
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78 | { |
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79 | return Symbol.RATIO; |
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80 | } |
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81 | |
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82 | @Override |
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83 | public LispObject classOf() |
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84 | { |
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85 | return BuiltInClass.RATIO; |
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86 | } |
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87 | |
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88 | @Override |
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89 | public LispObject typep(LispObject type) |
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90 | { |
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91 | if (type == Symbol.RATIO) |
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92 | return T; |
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93 | if (type == Symbol.RATIONAL) |
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94 | return T; |
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95 | if (type == Symbol.REAL) |
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96 | return T; |
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97 | if (type == Symbol.NUMBER) |
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98 | return T; |
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99 | if (type == BuiltInClass.RATIO) |
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100 | return T; |
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101 | return super.typep(type); |
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102 | } |
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103 | |
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104 | @Override |
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105 | public boolean numberp() |
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106 | { |
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107 | return true; |
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108 | } |
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109 | |
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110 | @Override |
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111 | public boolean rationalp() |
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112 | { |
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113 | return true; |
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114 | } |
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115 | |
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116 | @Override |
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117 | public boolean realp() |
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118 | { |
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119 | return true; |
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120 | } |
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121 | |
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122 | @Override |
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123 | public boolean eql(LispObject obj) |
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124 | { |
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125 | if (this == obj) |
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126 | return true; |
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127 | if (obj instanceof Ratio) { |
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128 | return (numerator.equals(((Ratio)obj).numerator) && |
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129 | denominator.equals(((Ratio)obj).denominator)); |
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130 | } |
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131 | return false; |
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132 | } |
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133 | |
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134 | @Override |
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135 | public boolean equal(LispObject obj) |
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136 | { |
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137 | return eql(obj); |
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138 | } |
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139 | |
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140 | @Override |
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141 | public boolean equalp(LispObject obj) |
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142 | { |
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143 | if (obj != null && obj.numberp()) |
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144 | return isEqualTo(obj); |
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145 | return false; |
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146 | } |
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147 | |
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148 | @Override |
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149 | public LispObject ABS() |
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150 | { |
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151 | if (numerator.signum() > 0 && denominator.signum() > 0) |
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152 | return this; |
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153 | if (numerator.signum() < 0 && denominator.signum() < 0) |
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154 | return this; |
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155 | return new Ratio(numerator.negate(), denominator); |
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156 | } |
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157 | |
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158 | @Override |
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159 | public boolean plusp() |
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160 | { |
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161 | return numerator.signum() == denominator.signum(); |
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162 | } |
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163 | |
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164 | @Override |
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165 | public boolean minusp() |
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166 | { |
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167 | return numerator.signum() != denominator.signum(); |
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168 | } |
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169 | |
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170 | @Override |
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171 | public boolean zerop() |
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172 | { |
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173 | return false; |
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174 | } |
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175 | |
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176 | @Override |
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177 | public float floatValue() |
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178 | { |
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179 | float result = (float) doubleValue(); |
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180 | if (Float.isInfinite(result) && TRAP_OVERFLOW) |
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181 | type_error(this, Symbol.SINGLE_FLOAT); |
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182 | |
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183 | return (float) doubleValue(); |
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184 | } |
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185 | |
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186 | @Override |
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187 | public double doubleValue() |
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188 | { |
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189 | double result = numerator.doubleValue() / denominator.doubleValue(); |
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190 | if (result != 0 && !Double.isNaN(result) && !Double.isInfinite(result)) |
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191 | return result; |
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192 | final boolean negative = numerator.signum() < 0; |
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193 | final BigInteger num = negative ? numerator.negate() : numerator; |
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194 | final BigInteger den = denominator; |
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195 | final int numLen = num.bitLength(); |
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196 | final int denLen = den.bitLength(); |
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197 | int length = Math.min(numLen, denLen); |
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198 | if (length <= 1) { |
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199 | // A precision of 512 is overkill for DOUBLE-FLOAT types |
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200 | // based on java.lang.Double TODO: optimize for space/time |
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201 | final MathContext mathContext = new MathContext(512, RoundingMode.HALF_EVEN); |
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202 | BigDecimal p = new BigDecimal(numerator, mathContext); |
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203 | BigDecimal q = new BigDecimal(denominator, mathContext); |
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204 | BigDecimal r = p.divide(q, mathContext); |
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205 | result = r.doubleValue(); |
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206 | return result; |
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207 | } |
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208 | |
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209 | BigInteger n = num; |
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210 | BigInteger d = den; |
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211 | final int digits = 54; |
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212 | if (length > digits) { |
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213 | n = n.shiftRight(length - digits); |
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214 | d = d.shiftRight(length - digits); |
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215 | length -= digits; |
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216 | } else { |
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217 | n = n.shiftRight(1); |
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218 | d = d.shiftRight(1); |
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219 | --length; |
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220 | } |
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221 | for (int i = 0; i < length; i++) { |
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222 | result = n.doubleValue() / d.doubleValue(); |
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223 | if (result != 0 && !Double.isNaN(result) && !Double.isInfinite(result)) |
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224 | break; |
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225 | n = n.shiftRight(1); |
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226 | d = d.shiftRight(1); |
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227 | } |
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228 | if (Double.isInfinite(result) && TRAP_OVERFLOW) |
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229 | type_error(this, Symbol.DOUBLE_FLOAT); |
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230 | |
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231 | return negative ? -result : result; |
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232 | } |
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233 | |
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234 | @Override |
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235 | public final LispObject incr() |
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236 | { |
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237 | return new Ratio(numerator.add(denominator), denominator); |
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238 | } |
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239 | |
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240 | @Override |
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241 | public final LispObject decr() |
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242 | { |
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243 | return new Ratio(numerator.subtract(denominator), denominator); |
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244 | } |
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245 | |
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246 | @Override |
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247 | public LispObject add(LispObject obj) |
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248 | { |
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249 | if (obj instanceof Fixnum) { |
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250 | BigInteger n = |
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251 | numerator.add(BigInteger.valueOf(((Fixnum)obj).value).multiply(denominator)); |
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252 | return number(n, denominator); |
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253 | } |
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254 | if (obj instanceof Bignum) { |
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255 | BigInteger n = ((Bignum)obj).value; |
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256 | return number(numerator.add(n.multiply(denominator)), |
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257 | denominator); |
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258 | } |
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259 | if (obj instanceof Ratio) { |
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260 | BigInteger n = ((Ratio)obj).numerator; |
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261 | BigInteger d = ((Ratio)obj).denominator; |
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262 | if (denominator.equals(d)) |
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263 | return number(numerator.add(n), denominator); |
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264 | BigInteger common = denominator.multiply(d); |
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265 | return number(numerator.multiply(d).add(n.multiply(denominator)), |
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266 | common); |
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267 | } |
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268 | if (obj instanceof SingleFloat) { |
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269 | return new SingleFloat(floatValue() + ((SingleFloat)obj).value); |
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270 | } |
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271 | if (obj instanceof DoubleFloat) { |
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272 | return new DoubleFloat(doubleValue() + ((DoubleFloat)obj).value); |
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273 | } |
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274 | if (obj instanceof Complex) { |
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275 | Complex c = (Complex) obj; |
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276 | return Complex.getInstance(add(c.getRealPart()), c.getImaginaryPart()); |
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277 | } |
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278 | return type_error(obj, Symbol.NUMBER); |
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279 | } |
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280 | |
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281 | @Override |
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282 | public LispObject subtract(LispObject obj) |
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283 | { |
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284 | if (obj instanceof Fixnum) { |
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285 | BigInteger n = |
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286 | numerator.subtract(BigInteger.valueOf(((Fixnum)obj).value).multiply(denominator)); |
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287 | return number(n, denominator); |
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288 | } |
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289 | if (obj instanceof Bignum) { |
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290 | BigInteger n = ((Bignum)obj).value; |
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291 | return number(numerator.subtract(n.multiply(denominator)), |
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292 | denominator); |
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293 | } |
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294 | if (obj instanceof Ratio) { |
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295 | BigInteger n = ((Ratio)obj).numerator; |
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296 | BigInteger d = ((Ratio)obj).denominator; |
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297 | if (denominator.equals(d)) |
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298 | return number(numerator.subtract(n), denominator); |
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299 | BigInteger common = denominator.multiply(d); |
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300 | return number(numerator.multiply(d).subtract(n.multiply(denominator)), |
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301 | common); |
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302 | } |
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303 | if (obj instanceof SingleFloat) { |
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304 | return new SingleFloat(floatValue() - ((SingleFloat)obj).value); |
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305 | } |
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306 | if (obj instanceof DoubleFloat) { |
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307 | return new DoubleFloat(doubleValue() - ((DoubleFloat)obj).value); |
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308 | } |
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309 | if (obj instanceof Complex) { |
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310 | Complex c = (Complex) obj; |
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311 | return Complex.getInstance(subtract(c.getRealPart()), |
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312 | Fixnum.ZERO.subtract(c.getImaginaryPart())); |
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313 | } |
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314 | return type_error(obj, Symbol.NUMBER); |
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315 | } |
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316 | |
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317 | @Override |
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318 | public LispObject multiplyBy(LispObject obj) |
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319 | { |
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320 | if (obj instanceof Fixnum) { |
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321 | BigInteger n = ((Fixnum)obj).getBigInteger(); |
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322 | return number(numerator.multiply(n), denominator); |
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323 | } |
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324 | if (obj instanceof Bignum) { |
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325 | BigInteger n = ((Bignum)obj).value; |
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326 | return number(numerator.multiply(n), denominator); |
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327 | } |
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328 | if (obj instanceof Ratio) { |
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329 | BigInteger n = ((Ratio)obj).numerator; |
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330 | BigInteger d = ((Ratio)obj).denominator; |
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331 | return number(numerator.multiply(n), denominator.multiply(d)); |
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332 | } |
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333 | if (obj instanceof SingleFloat) { |
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334 | return new SingleFloat(floatValue() * ((SingleFloat)obj).value); |
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335 | } |
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336 | if (obj instanceof DoubleFloat) { |
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337 | return new DoubleFloat(doubleValue() * ((DoubleFloat)obj).value); |
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338 | } |
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339 | if (obj instanceof Complex) { |
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340 | Complex c = (Complex) obj; |
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341 | return Complex.getInstance(multiplyBy(c.getRealPart()), |
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342 | multiplyBy(c.getImaginaryPart())); |
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343 | } |
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344 | return type_error(obj, Symbol.NUMBER); |
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345 | } |
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346 | |
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347 | @Override |
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348 | public LispObject divideBy(LispObject obj) |
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349 | { |
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350 | if (obj.zerop()) { |
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351 | LispObject operands = new Cons(this, new Cons(obj)); |
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352 | LispObject args = new Cons(Keyword.OPERATION, |
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353 | new Cons(Symbol.SLASH, |
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354 | new Cons(Keyword.OPERANDS, |
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355 | new Cons(operands)))); |
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356 | return error(new DivisionByZero(args)); |
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357 | } |
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358 | |
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359 | if (obj instanceof Fixnum) { |
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360 | BigInteger n = ((Fixnum)obj).getBigInteger(); |
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361 | return number(numerator, denominator.multiply(n)); |
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362 | } |
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363 | if (obj instanceof Bignum) { |
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364 | BigInteger n = ((Bignum)obj).value; |
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365 | return number(numerator, denominator.multiply(n)); |
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366 | } |
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367 | if (obj instanceof Ratio) { |
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368 | BigInteger n = ((Ratio)obj).numerator; |
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369 | BigInteger d = ((Ratio)obj).denominator; |
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370 | return number(numerator.multiply(d), denominator.multiply(n)); |
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371 | } |
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372 | if (obj instanceof SingleFloat) { |
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373 | return new SingleFloat(floatValue() / ((SingleFloat)obj).value); |
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374 | } |
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375 | if (obj instanceof DoubleFloat) { |
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376 | return new DoubleFloat(doubleValue() / ((DoubleFloat)obj).value); |
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377 | } |
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378 | if (obj instanceof Complex) { |
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379 | Complex c = (Complex) obj; |
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380 | // numerator |
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381 | LispObject realPart = this.multiplyBy(c.getRealPart()); |
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382 | LispObject imagPart = |
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383 | Fixnum.ZERO.subtract(this).multiplyBy(c.getImaginaryPart()); |
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384 | // denominator |
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385 | LispObject d = |
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386 | c.getRealPart().multiplyBy(c.getRealPart()); |
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387 | d = d.add(c.getImaginaryPart().multiplyBy(c.getImaginaryPart())); |
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388 | return Complex.getInstance(realPart.divideBy(d), |
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389 | imagPart.divideBy(d)); |
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390 | } |
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391 | return type_error(obj, Symbol.NUMBER); |
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392 | } |
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393 | |
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394 | @Override |
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395 | public boolean isEqualTo(LispObject obj) |
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396 | { |
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397 | if (obj instanceof Ratio) |
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398 | return (numerator.equals(((Ratio)obj).numerator) && |
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399 | denominator.equals(((Ratio)obj).denominator)); |
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400 | if (obj instanceof SingleFloat) |
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401 | return isEqualTo(((SingleFloat)obj).rational()); |
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402 | if (obj instanceof DoubleFloat) |
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403 | return isEqualTo(((DoubleFloat)obj).rational()); |
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404 | if (obj.numberp()) |
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405 | return false; |
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406 | type_error(obj, Symbol.NUMBER); |
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407 | // Not reached. |
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408 | return false; |
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409 | } |
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410 | |
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411 | @Override |
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412 | public boolean isNotEqualTo(LispObject obj) |
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413 | { |
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414 | return !isEqualTo(obj); |
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415 | } |
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416 | |
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417 | @Override |
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418 | public boolean isLessThan(LispObject obj) |
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419 | { |
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420 | if (obj instanceof Fixnum) { |
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421 | BigInteger n2 = ((Fixnum)obj).getBigInteger().multiply(denominator); |
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422 | return numerator.compareTo(n2) < 0; |
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423 | } |
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424 | if (obj instanceof Bignum) { |
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425 | BigInteger n = ((Bignum)obj).value.multiply(denominator); |
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426 | return numerator.compareTo(n) < 0; |
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427 | } |
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428 | if (obj instanceof Ratio) { |
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429 | BigInteger n1 = numerator.multiply(((Ratio)obj).denominator); |
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430 | BigInteger n2 = ((Ratio)obj).numerator.multiply(denominator); |
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431 | return n1.compareTo(n2) < 0; |
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432 | } |
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433 | if (obj instanceof SingleFloat) |
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434 | return isLessThan(((SingleFloat)obj).rational()); |
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435 | if (obj instanceof DoubleFloat) |
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436 | return isLessThan(((DoubleFloat)obj).rational()); |
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437 | type_error(obj, Symbol.REAL); |
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438 | // Not reached. |
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439 | return false; |
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440 | } |
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441 | |
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442 | @Override |
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443 | public boolean isGreaterThan(LispObject obj) |
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444 | { |
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445 | if (obj instanceof Fixnum) { |
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446 | BigInteger n2 = ((Fixnum)obj).getBigInteger().multiply(denominator); |
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447 | return numerator.compareTo(n2) > 0; |
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448 | } |
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449 | if (obj instanceof Bignum) { |
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450 | BigInteger n = ((Bignum)obj).value.multiply(denominator); |
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451 | return numerator.compareTo(n) > 0; |
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452 | } |
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453 | if (obj instanceof Ratio) { |
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454 | BigInteger n1 = numerator.multiply(((Ratio)obj).denominator); |
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455 | BigInteger n2 = ((Ratio)obj).numerator.multiply(denominator); |
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456 | return n1.compareTo(n2) > 0; |
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457 | } |
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458 | if (obj instanceof SingleFloat) |
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459 | return isGreaterThan(((SingleFloat)obj).rational()); |
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460 | if (obj instanceof DoubleFloat) |
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461 | return isGreaterThan(((DoubleFloat)obj).rational()); |
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462 | type_error(obj, Symbol.REAL); |
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463 | // Not reached. |
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464 | return false; |
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465 | } |
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466 | |
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467 | @Override |
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468 | public boolean isLessThanOrEqualTo(LispObject obj) |
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469 | { |
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470 | if (obj instanceof Fixnum) { |
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471 | BigInteger n2 = ((Fixnum)obj).getBigInteger().multiply(denominator); |
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472 | return numerator.compareTo(n2) <= 0; |
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473 | } |
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474 | if (obj instanceof Bignum) { |
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475 | BigInteger n = ((Bignum)obj).value.multiply(denominator); |
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476 | return numerator.compareTo(n) <= 0; |
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477 | } |
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478 | if (obj instanceof Ratio) { |
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479 | BigInteger n1 = numerator.multiply(((Ratio)obj).denominator); |
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480 | BigInteger n2 = ((Ratio)obj).numerator.multiply(denominator); |
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481 | return n1.compareTo(n2) <= 0; |
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482 | } |
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483 | if (obj instanceof SingleFloat) |
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484 | return isLessThanOrEqualTo(((SingleFloat)obj).rational()); |
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485 | if (obj instanceof DoubleFloat) |
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486 | return isLessThanOrEqualTo(((DoubleFloat)obj).rational()); |
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487 | type_error(obj, Symbol.REAL); |
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488 | // Not reached. |
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489 | return false; |
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490 | } |
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491 | |
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492 | @Override |
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493 | public boolean isGreaterThanOrEqualTo(LispObject obj) |
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494 | { |
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495 | if (obj instanceof Fixnum) { |
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496 | BigInteger n2 = ((Fixnum)obj).getBigInteger().multiply(denominator); |
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497 | return numerator.compareTo(n2) >= 0; |
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498 | } |
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499 | if (obj instanceof Bignum) { |
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500 | BigInteger n = ((Bignum)obj).value.multiply(denominator); |
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501 | return numerator.compareTo(n) >= 0; |
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502 | } |
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503 | if (obj instanceof Ratio) { |
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504 | BigInteger n1 = numerator.multiply(((Ratio)obj).denominator); |
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505 | BigInteger n2 = ((Ratio)obj).numerator.multiply(denominator); |
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506 | return n1.compareTo(n2) >= 0; |
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507 | } |
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508 | if (obj instanceof SingleFloat) |
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509 | return isGreaterThanOrEqualTo(((SingleFloat)obj).rational()); |
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510 | if (obj instanceof DoubleFloat) |
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511 | return isGreaterThanOrEqualTo(((DoubleFloat)obj).rational()); |
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512 | type_error(obj, Symbol.REAL); |
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513 | // Not reached. |
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514 | return false; |
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515 | } |
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516 | |
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517 | @Override |
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518 | public LispObject truncate(LispObject obj) |
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519 | { |
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520 | // "When rationals and floats are combined by a numerical function, |
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521 | // the rational is first converted to a float of the same format." |
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522 | // 12.1.4.1 |
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523 | if (obj instanceof SingleFloat) |
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524 | return new SingleFloat(floatValue()).truncate(obj); |
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525 | if (obj instanceof DoubleFloat) |
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526 | return new DoubleFloat(doubleValue()).truncate(obj); |
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527 | BigInteger n, d; |
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528 | try { |
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529 | if (obj instanceof Fixnum) { |
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530 | n = ((Fixnum)obj).getBigInteger(); |
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531 | d = BigInteger.ONE; |
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532 | } else if (obj instanceof Bignum) { |
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533 | n = ((Bignum)obj).value; |
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534 | d = BigInteger.ONE; |
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535 | } else if (obj instanceof Ratio) { |
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536 | n = ((Ratio)obj).numerator(); |
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537 | d = ((Ratio)obj).denominator(); |
---|
538 | } else { |
---|
539 | return type_error(obj, Symbol.NUMBER); |
---|
540 | } |
---|
541 | // Invert and multiply. |
---|
542 | BigInteger num = numerator.multiply(d); |
---|
543 | BigInteger den = denominator.multiply(n); |
---|
544 | BigInteger quotient = num.divide(den); |
---|
545 | // Multiply quotient by divisor. |
---|
546 | LispObject product = number(quotient.multiply(n), d); |
---|
547 | // Subtract to get remainder. |
---|
548 | LispObject remainder = subtract(product); |
---|
549 | return LispThread.currentThread().setValues(number(quotient), remainder); |
---|
550 | } |
---|
551 | catch (ArithmeticException e) { |
---|
552 | if (obj.zerop()) { |
---|
553 | LispObject operands = new Cons(this, new Cons(obj)); |
---|
554 | LispObject args = new Cons(Keyword.OPERATION, |
---|
555 | new Cons(Symbol.TRUNCATE, |
---|
556 | new Cons(Keyword.OPERANDS, |
---|
557 | new Cons(operands)))); |
---|
558 | return error(new DivisionByZero(args)); |
---|
559 | } |
---|
560 | return error(new ArithmeticError(e.getMessage())); |
---|
561 | } |
---|
562 | } |
---|
563 | |
---|
564 | @Override |
---|
565 | public int hashCode() |
---|
566 | { |
---|
567 | return numerator.hashCode() ^ denominator.hashCode(); |
---|
568 | } |
---|
569 | |
---|
570 | @Override |
---|
571 | public String printObject() |
---|
572 | { |
---|
573 | final LispThread thread = LispThread.currentThread(); |
---|
574 | int base = Fixnum.getValue(Symbol.PRINT_BASE.symbolValue(thread)); |
---|
575 | StringBuffer sb = new StringBuffer(numerator.toString(base)); |
---|
576 | sb.append('/'); |
---|
577 | sb.append(denominator.toString(base)); |
---|
578 | String s = sb.toString().toUpperCase(); |
---|
579 | if (Symbol.PRINT_RADIX.symbolValue(thread) != NIL) { |
---|
580 | sb.setLength(0); |
---|
581 | switch (base) { |
---|
582 | case 2: |
---|
583 | sb.append("#b"); |
---|
584 | sb.append(s); |
---|
585 | break; |
---|
586 | case 8: |
---|
587 | sb.append("#o"); |
---|
588 | sb.append(s); |
---|
589 | break; |
---|
590 | case 10: |
---|
591 | sb.append("#10r"); |
---|
592 | sb.append(s); |
---|
593 | break; |
---|
594 | case 16: |
---|
595 | sb.append("#x"); |
---|
596 | sb.append(s); |
---|
597 | break; |
---|
598 | default: |
---|
599 | sb.append('#'); |
---|
600 | sb.append(String.valueOf(base)); |
---|
601 | sb.append('r'); |
---|
602 | sb.append(s); |
---|
603 | break; |
---|
604 | } |
---|
605 | s = sb.toString(); |
---|
606 | } |
---|
607 | return s; |
---|
608 | } |
---|
609 | } |
---|