| 1 | /* This file is part of the project "Hilbert II" - http://www.qedeq.org |
| 2 | * |
| 3 | * Copyright 2000-2014, Michael Meyling <mime@qedeq.org>. |
| 4 | * |
| 5 | * "Hilbert II" is free software; you can redistribute |
| 6 | * it and/or modify it under the terms of the GNU General Public |
| 7 | * License as published by the Free Software Foundation; either |
| 8 | * version 2 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | package org.qedeq.kernel.xml.handler.parser; |
| 17 | |
| 18 | import java.util.ArrayList; |
| 19 | import java.util.List; |
| 20 | |
| 21 | import org.qedeq.kernel.bo.parser.Operator; |
| 22 | import org.qedeq.kernel.xml.common.XmlSyntaxException; |
| 23 | import org.qedeq.kernel.xml.handler.common.AbstractSimpleHandler; |
| 24 | import org.qedeq.kernel.xml.handler.common.SaxDefaultHandler; |
| 25 | import org.qedeq.kernel.xml.handler.common.SimpleAttributes; |
| 26 | |
| 27 | |
| 28 | /** |
| 29 | * Parses list of operators. Result is a list of all parsed operators. |
| 30 | * |
| 31 | * @author Michael Meyling |
| 32 | */ |
| 33 | public final class ParserHandler extends AbstractSimpleHandler { |
| 34 | |
| 35 | /** List of all Operators. */ |
| 36 | private List operators = new ArrayList(); |
| 37 | |
| 38 | /** Operator start symbol. */ |
| 39 | private String startSymbol; |
| 40 | |
| 41 | /** QEDEQ representation. E.g. "PREDCON". */ |
| 42 | private String qedeq; |
| 43 | |
| 44 | /** QEDEQ argument. E.g. "equal". */ |
| 45 | private String qedeqArgument; |
| 46 | |
| 47 | /** Operator priority. */ |
| 48 | private Integer priority; |
| 49 | |
| 50 | /** Minimum argument number. */ |
| 51 | private Integer min; |
| 52 | |
| 53 | /** Maximum argument number. */ |
| 54 | private Integer max; |
| 55 | |
| 56 | |
| 57 | /** |
| 58 | * Handle a parser XML file. |
| 59 | * |
| 60 | * @param defaultHandler Startup handler. |
| 61 | */ |
| 62 | public ParserHandler(final SaxDefaultHandler defaultHandler) { |
| 63 | super(defaultHandler, "parser"); |
| 64 | } |
| 65 | |
| 66 | public final void init() { |
| 67 | operators.clear(); |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * Get list of operators. |
| 72 | * |
| 73 | * @return Operator list. |
| 74 | */ |
| 75 | public final List getOperators() { |
| 76 | return operators; |
| 77 | } |
| 78 | |
| 79 | public final void startElement(final String name, final SimpleAttributes attributes) |
| 80 | throws XmlSyntaxException { |
| 81 | if (getStartTag().equals(name)) { |
| 82 | // nothing todo |
| 83 | } else if ("prefixOperator".equals(name)) { |
| 84 | setBasisAttributes(name, attributes); |
| 85 | addOperator(Operator.SIMPLE_PREFIX); |
| 86 | } else if ("infixOperator".equals(name)) { |
| 87 | setBasisAttributes(name, attributes); |
| 88 | addOperator(Operator.INFIX); |
| 89 | } else if ("functionOperator".equals(name)) { |
| 90 | setBasisAttributes(name, attributes); |
| 91 | addOperator(Operator.FUNCTION); |
| 92 | } else if ("complexOperator".equals(name)) { |
| 93 | setBasisAttributes(name, attributes); |
| 94 | final String separatorSymbol = attributes.getString("separatorSymbol"); |
| 95 | if (separatorSymbol == null) { |
| 96 | throw XmlSyntaxException.createEmptyAttributeException(name, "separatorSymbol"); |
| 97 | } |
| 98 | if (separatorSymbol.length() == 0) { |
| 99 | throw XmlSyntaxException.createMissingAttributeException(name, "separatorSymbol"); |
| 100 | } |
| 101 | final String endSymbol = attributes.getString("endSymbol"); |
| 102 | if (endSymbol == null) { |
| 103 | throw XmlSyntaxException.createEmptyAttributeException(name, "endSymbol"); |
| 104 | } |
| 105 | if (endSymbol.length() == 0) { |
| 106 | throw XmlSyntaxException.createMissingAttributeException(name, "endSymbol"); |
| 107 | } |
| 108 | if (max == null) { |
| 109 | operators.add(new Operator(startSymbol, separatorSymbol, endSymbol, qedeq, |
| 110 | qedeqArgument, priority.intValue(), min.intValue())); |
| 111 | } else { |
| 112 | operators.add(new Operator(startSymbol, separatorSymbol, endSymbol, qedeq, |
| 113 | qedeqArgument, priority.intValue(), min.intValue(), max.intValue())); |
| 114 | } |
| 115 | } else { |
| 116 | throw XmlSyntaxException.createUnexpectedTagException(name); |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | private void addOperator(final int type) { |
| 121 | if (max == null) { |
| 122 | operators.add(new Operator(startSymbol, qedeq, qedeqArgument, priority.intValue(), |
| 123 | type, min.intValue())); |
| 124 | } else { |
| 125 | operators.add(new Operator(startSymbol, qedeq, qedeqArgument, priority.intValue(), |
| 126 | type, min.intValue(), max.intValue())); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | private void setBasisAttributes(final String element, final SimpleAttributes attributes) |
| 131 | throws XmlSyntaxException { |
| 132 | startSymbol = attributes.getString("startSymbol"); |
| 133 | if (startSymbol == null) { |
| 134 | throw XmlSyntaxException.createMissingAttributeException(element, "startSymbol"); |
| 135 | } |
| 136 | if (startSymbol.length() == 0) { |
| 137 | throw XmlSyntaxException.createEmptyAttributeException(element, "startSymbol"); |
| 138 | } |
| 139 | qedeq = attributes.getString("qedeq"); |
| 140 | if (qedeq == null) { |
| 141 | throw XmlSyntaxException.createMissingAttributeException(element, "qedeq"); |
| 142 | } |
| 143 | if (qedeq.length() == 0) { |
| 144 | throw XmlSyntaxException.createEmptyAttributeException(element, "qedeq"); |
| 145 | } |
| 146 | qedeqArgument = attributes.getString("qedeqArgument"); |
| 147 | priority = attributes.getInteger("priority"); |
| 148 | if (priority == null || priority.intValue() < 0) { |
| 149 | throw XmlSyntaxException.createMissingAttributeException(element, "priority"); |
| 150 | } |
| 151 | min = attributes.getInteger("min"); |
| 152 | if (min == null) { |
| 153 | min = new Integer(0); |
| 154 | } |
| 155 | max = attributes.getInteger("max"); |
| 156 | } |
| 157 | |
| 158 | public final void endElement(final String name) throws XmlSyntaxException { |
| 159 | if (getStartTag().equals(name)) { |
| 160 | // nothing to do |
| 161 | } else if ("prefixOperator".equals(name)) { |
| 162 | // nothing to do |
| 163 | } else if ("infixOperator".equals(name)) { |
| 164 | // nothing to do |
| 165 | } else if ("functionOperator".equals(name)) { |
| 166 | // nothing to do |
| 167 | } else if ("complexOperator".equals(name)) { |
| 168 | // nothing to do |
| 169 | } else { |
| 170 | throw XmlSyntaxException.createUnexpectedTagException(name); |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | } |