1 | /**
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2 | * ExpediteeJEP.java
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3 | * Copyright (C) 2010 New Zealand Digital Library, http://expeditee.org
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4 | *
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5 | * This program is free software: you can redistribute it and/or modify
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6 | * it under the terms of the GNU General Public License as published by
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7 | * the Free Software Foundation, either version 3 of the License, or
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8 | * (at your option) any later version.
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9 | *
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10 | * This program is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | * GNU General Public License for more details.
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14 | *
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15 | * You should have received a copy of the GNU General Public License
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16 | * along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 | */
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18 |
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19 | package org.expeditee.math;
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20 |
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21 | import java.text.NumberFormat;
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22 | import java.util.Collection;
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23 | import java.util.LinkedList;
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24 | import java.util.Observable;
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25 | import java.util.Observer;
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26 |
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27 | import org.expeditee.gui.AttributeValuePair;
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28 | import org.expeditee.gui.Frame;
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29 | import org.expeditee.gui.FrameUtils;
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30 | import org.expeditee.items.Item;
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31 | import org.expeditee.items.Text;
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32 | import org.lsmp.djep.vectorJep.VectorJep;
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33 | import org.lsmp.djep.vectorJep.values.MVector;
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34 | import org.nfunk.jep.Node;
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35 | import org.nfunk.jep.ParseException;
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36 | import org.nfunk.jep.Variable;
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37 |
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38 | public class ExpediteeJEP extends VectorJep {
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39 | Observer observer = null;
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40 |
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41 | public ExpediteeJEP() {
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42 | super();
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43 | addStandardFunctions();
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44 | addStandardConstants();
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45 | setImplicitMul(true);
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46 | setAllowAssignment(true);
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47 | setAllowUndeclared(true);
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48 | resetObserver();
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49 | }
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50 |
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51 | public void resetObserver() {
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52 | observer = new Observer() {
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53 | private String _attribute = "";
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54 |
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55 | public void update(Observable ob, Object o) {
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56 | assert (o instanceof Variable);
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57 | _attribute = ((Variable) o).getName();
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58 | }
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59 |
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60 | @Override
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61 | public String toString() {
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62 | return _attribute;
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63 | }
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64 | };
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65 | getSymbolTable().addObserver(observer);
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66 | getSymbolTable().addObserverToExistingVariables(observer);
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67 | }
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68 |
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69 | public String evaluate(Node node) throws ParseException {
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70 | return evaluate(node, true);
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71 | }
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72 |
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73 | public String evaluate(Node node, boolean prependVarName)
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74 | throws ParseException {
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75 | Object rawResult = rawResult = super.evaluate(node);
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76 |
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77 | if (rawResult instanceof Double) {
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78 | Double result = (Double) rawResult;
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79 | if (result.isNaN()) {
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80 | return null;
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81 | }
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82 | NumberFormat nf = NumberFormat.getInstance();
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83 | // TODO see if the parser can handle commas if a flag is switched
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84 | nf.setGroupingUsed(false);
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85 | nf.setMinimumFractionDigits(0);
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86 | nf.setMaximumFractionDigits(15);
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87 | String varName = observer.toString();
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88 | if (varName.length() > 0)
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89 | return (prependVarName ? (varName + ": ") : "")
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90 | + nf.format(result);
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91 |
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92 | return nf.format(result);
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93 | }
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94 | return rawResult.toString();
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95 | }
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96 |
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97 | public void addVariables(Frame frame) {
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98 | if (frame == null)
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99 | return;
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100 | // Check for variables
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101 | for (Text t : frame.getTextItems()) {
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102 | if (t.isAnnotation())
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103 | continue;
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104 |
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105 | AttributeValuePair avp = t.getAttributeValuePair();
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106 | if (avp.hasPair()) {
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107 | try {
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108 | if (getVar(avp.getAttribute()) == null) {
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109 | Double d = avp.getDoubleValue();
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110 | if (!d.equals(Double.NaN))
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111 | addVariable(avp.getAttribute(), avp
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112 | .getDoubleValue());
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113 | }
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114 | } catch (Exception e) {
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115 | e.printStackTrace();
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116 | }
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117 | } else if (t.isLineEnd()) {
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118 | Collection<Item> enclosed = FrameUtils.getItemsEnclosedBy(
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119 | frame, t.getEnclosedShape());
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120 | String variableName = t.getText();
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121 | if (!variableName.contains(" "))
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122 | addVectorVariable(enclosed, variableName);
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123 | }
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124 | }
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125 | }
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126 |
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127 | /**
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128 | * @param textItems
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129 | * @param variableName
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130 | */
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131 | public void addVectorVariable(Collection<Item> items, String variableName) {
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132 | Collection<Double> vector = new LinkedList<Double>();
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133 | for (Item i : items) {
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134 | if (i instanceof Text && !i.isAnnotation() && !i.isLineEnd()) {
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135 | try {
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136 | Double value = i.getAttributeValuePair().getDoubleValue();
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137 | if (!value.equals(Double.NaN)) {
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138 | vector.add(value);
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139 | }
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140 | } catch (Exception e) {
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141 | e.printStackTrace();
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142 | }
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143 | }
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144 | }
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145 | // At the moment the VSum method will not work with empty vectors.
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146 | if (vector.size() > 0)
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147 | addVariable(variableName, MVector.getInstance(vector.toArray()));
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148 | }
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149 |
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150 | public String getNewVariable() {
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151 | return observer.toString();
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152 | }
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153 | }
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