1 | package de.ugoe.cs.swe.bnftools.validation; |
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2 | |
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3 | import java.util.ArrayList; |
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4 | import java.util.Collection; |
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5 | import java.util.Collections; |
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6 | import java.util.HashMap; |
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7 | import java.util.HashSet; |
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8 | import java.util.Iterator; |
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9 | import java.util.List; |
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10 | import java.util.Set; |
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11 | import java.util.Stack; |
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12 | |
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13 | import org.eclipse.emf.common.util.EList; |
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14 | import org.eclipse.emf.common.util.URI; |
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15 | import org.eclipse.emf.ecore.EObject; |
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16 | import org.eclipse.emf.ecore.resource.Resource; |
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17 | import org.eclipse.xtext.parsetree.AbstractNode; |
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18 | import org.eclipse.xtext.parsetree.CompositeNode; |
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19 | import org.eclipse.xtext.parsetree.LeafNode; |
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20 | import org.eclipse.xtext.parsetree.NodeUtil; |
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21 | import org.eclipse.xtext.resource.IResourceDescriptions; |
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22 | import org.eclipse.xtext.resource.XtextResource; |
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23 | import org.eclipse.xtext.resource.XtextResourceSet; |
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24 | import org.eclipse.xtext.validation.Check; |
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25 | import org.eclipse.xtext.validation.CheckType; |
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26 | |
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27 | import com.google.inject.Inject; |
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28 | |
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29 | import de.ugoe.cs.swe.bnftools.analysis.EbnfAnalysisUtils; |
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30 | import de.ugoe.cs.swe.bnftools.ebnf.BnfEntry; |
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31 | import de.ugoe.cs.swe.bnftools.ebnf.DefinitionList; |
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32 | import de.ugoe.cs.swe.bnftools.ebnf.EtsiBnf; |
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33 | import de.ugoe.cs.swe.bnftools.ebnf.ExtRule; |
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34 | import de.ugoe.cs.swe.bnftools.ebnf.Import; |
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35 | import de.ugoe.cs.swe.bnftools.ebnf.Rule; |
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36 | import de.ugoe.cs.swe.bnftools.ebnf.SingleDefinition; |
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37 | |
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38 | public class EbnfJavaValidator extends AbstractEbnfJavaValidator { |
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39 | |
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40 | @Inject |
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41 | IResourceDescriptions resourceDescriptions; |
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42 | |
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43 | public static final String ruleReferencedOneDescription = "The rule is only referenced by one other rule"; |
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44 | public static final String passthroughRuleDescription = "The rule is a passthrough rule"; |
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45 | public static final String unreferencedPassthroughRuleDescription = "The rule is an unreferenced passthrough rule"; |
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46 | public static final String unusedRuleDescription = "The rule is not referenced anywhere"; |
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47 | public static final String equalAlternativeDescription = "The rule contains equal alternatives"; |
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48 | public static final String duplicateRulesDescription = "The rule is a duplicate"; |
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49 | public static final String duplicateSubRulesDescription = "A part of rule is a duplicate"; |
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50 | public static final String packageConsistencyCheckRuleMissingDescription = "Rule has been removed or renamed in the updated grammar. The package rule is therefore now an additional rule instead of a replacement rule. The package rule might therefore be inconsistent with the updated core grammar."; |
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51 | public static final String packageConsistencyCheckRuleDifferentDescription = "Corresponding core grammar rule has been changed in updated grammar. The package rule might have become inconsistent with the updated core grammar."; |
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52 | public static final String packageConsistencyCheckCorrespondingRuleMissingDescription = "Corresponding rule is missing in core grammar. Rule has been manually altered in the delta grammar (delta grammar is outdated) or the /core and /update flags are somehow switched."; |
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53 | |
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54 | public static boolean checkReferencedOnlyOnce = false; |
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55 | public static boolean checkPassthroughRule = false; |
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56 | public static boolean checkUnusedRule = false; |
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57 | public static boolean checkEqualAlternative = false; |
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58 | public static boolean checkDuplicateRules = false; |
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59 | public static boolean checkSubruleDuplicates = false; |
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60 | public static boolean checkUpdatedGrammarConsistency = false; |
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61 | |
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62 | // ---------------------------------------------------------------------------------------------------- |
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63 | |
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64 | @Check(CheckType.EXPENSIVE) |
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65 | public void checkUpdateGrammarConsistency(EtsiBnf bnf) { |
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66 | if (!checkUpdatedGrammarConsistency) |
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67 | return; |
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68 | |
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69 | CompositeNode compNode = NodeUtil.getRootNode(bnf); |
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70 | XtextResourceSet set = new XtextResourceSet(); |
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71 | URI uri = compNode.getElement().eResource().getURI(); |
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72 | Iterable<AbstractNode> allNodes = NodeUtil.getAllContents(compNode); |
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73 | if(!bnf.getType().equals("/delta")) |
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74 | return; |
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75 | |
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76 | Resource coreRes = null; |
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77 | Resource updatedRes = null; |
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78 | EList<Import> imports = bnf.getImportSection().getImports(); |
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79 | |
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80 | for(int j=0; j<imports.size(); j++) { |
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81 | if(imports.get(j).getGrammarType().equals("core")) { |
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82 | String packageUri = uri.trimSegments(1).toPlatformString(true); |
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83 | String fullUri = packageUri + "/" +imports.get(j).getImportURI(); |
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84 | coreRes= set.getResource( URI.createPlatformResourceURI(fullUri, true), true); |
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85 | } |
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86 | if(imports.get(j).getGrammarType().equals("update")) { |
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87 | String packageUri = uri.trimSegments(1).toPlatformString(true); |
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88 | String fullUri = packageUri + "/" +imports.get(j).getImportURI(); |
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89 | updatedRes= set.getResource( URI.createPlatformResourceURI(fullUri, true), true); |
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90 | } |
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91 | } |
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92 | |
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93 | if( (coreRes==null) || (updatedRes==null)) |
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94 | return; |
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95 | |
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96 | XtextResource coreResource = null; |
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97 | XtextResource updatedResource = null; |
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98 | |
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99 | if(coreRes instanceof XtextResource) |
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100 | coreResource = (XtextResource) coreRes; |
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101 | if(updatedRes instanceof XtextResource) |
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102 | updatedResource = (XtextResource) updatedRes; |
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103 | |
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104 | /* |
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105 | * the idea: get the core grammar and the updated grammar |
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106 | * for each extension rule in the delta grammar, |
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107 | * find the corresponding rule in the updated grammar and the core grammar |
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108 | * if it doesn't exist in the updated grammar write the inconsistency |
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109 | * if it exists, compare to the rule in the core grammar |
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110 | */ |
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111 | for(AbstractNode node: allNodes) { |
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112 | if(node.getElement() instanceof ExtRule) { |
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113 | checkForConsistency(node, coreResource, updatedResource, compNode); |
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114 | } |
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115 | } |
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116 | } |
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117 | |
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118 | private boolean checkForConsistency(AbstractNode node, XtextResource coreResource, XtextResource updatedResource, CompositeNode compNode) { |
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119 | //updated grammar: |
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120 | AbstractNode updatedRule = null; |
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121 | AbstractNode coreRule = null; |
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122 | Rule currentRule = null; |
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123 | for(AbstractNode uNode : NodeUtil.getAllContents(updatedResource.getParseResult().getRootNode())) { |
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124 | if (uNode.getElement() instanceof Rule) { |
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125 | currentRule = (Rule) uNode.getElement(); |
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126 | if (currentRule.getName().equals(((ExtRule) node.getElement()).getName())) { |
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127 | updatedRule = uNode; |
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128 | break; |
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129 | } |
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130 | } |
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131 | } |
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132 | |
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133 | if(updatedRule == null) { |
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134 | warning(EbnfJavaValidator.packageConsistencyCheckRuleMissingDescription, node.getElement(), 1); |
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135 | return false; |
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136 | } else { //core grammar |
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137 | for(AbstractNode cNode : NodeUtil.getAllContents(coreResource.getParseResult().getRootNode())) { |
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138 | if(cNode.getElement() instanceof Rule) |
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139 | if(((Rule) cNode.getElement()).getName().equals(((ExtRule) node.getElement()).getName())) { |
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140 | coreRule = cNode; |
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141 | break; |
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142 | } |
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143 | } |
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144 | |
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145 | if(coreRule == null){ |
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146 | warning(EbnfJavaValidator.packageConsistencyCheckCorrespondingRuleMissingDescription, node.getElement(), 1); |
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147 | return false; |
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148 | } |
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149 | |
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150 | if (compareRules(coreRule, updatedRule)) { |
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151 | return true; |
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152 | } else { |
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153 | warning(EbnfJavaValidator.packageConsistencyCheckRuleDifferentDescription, node.getElement(), 1); |
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154 | return false; |
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155 | } |
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156 | |
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157 | } |
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158 | } |
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159 | |
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160 | // returns true, if the rules are equal |
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161 | private boolean compareRules(AbstractNode cNode, AbstractNode uNode) { |
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162 | EList<LeafNode> cLeaves = removeWS(cNode.getLeafNodes()); |
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163 | EList<LeafNode> uLeaves = removeWS(uNode.getLeafNodes()); |
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164 | if (cLeaves.size() != uLeaves.size()) |
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165 | return false; |
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166 | |
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167 | for(int i=0; i < cLeaves.size(); i++) { |
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168 | if(!(cLeaves.get(i).serialize().equals(uLeaves.get(i).serialize()))) |
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169 | return false; |
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170 | |
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171 | } |
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172 | return true; |
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173 | } |
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174 | |
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175 | private EList<LeafNode> removeWS(EList<LeafNode> leaves) { |
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176 | for(int i=0; i < leaves.size(); i++) { |
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177 | if(!(leaves.get(i).getGrammarElement() instanceof org.eclipse.xtext.impl.TerminalRuleImpl)) |
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178 | leaves.remove(i); |
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179 | } |
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180 | return leaves; |
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181 | } |
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182 | |
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183 | // ---------------------------------------------------------------------------------------------------- |
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184 | |
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185 | @Check(CheckType.EXPENSIVE) |
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186 | public void checkReferencedOnlyOnce(Rule rule) { |
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187 | if (!checkReferencedOnlyOnce) |
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188 | return; |
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189 | |
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190 | if (EbnfAnalysisUtils.isTokenRule(rule)) |
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191 | return; |
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192 | |
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193 | List<Rule> references = EbnfAnalysisUtils.findReferences(rule, |
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194 | resourceDescriptions); |
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195 | |
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196 | if (references.size() == 1) { |
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197 | warning(EbnfJavaValidator.ruleReferencedOneDescription, 1, |
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198 | EbnfJavaValidator.ruleReferencedOneDescription); |
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199 | } |
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200 | } |
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201 | |
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202 | // ---------------------------------------------------------------------------------------------------- |
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203 | |
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204 | @Check(CheckType.EXPENSIVE) |
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205 | public void checkPassthroughRule(Rule rule) { |
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206 | if (!checkPassthroughRule) |
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207 | return; |
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208 | |
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209 | List<Rule> references = EbnfAnalysisUtils.findReferences(rule, |
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210 | resourceDescriptions); |
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211 | |
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212 | if (EbnfAnalysisUtils.isPassthroughRule(rule)) { |
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213 | if (references.size() == 0) { |
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214 | warning( |
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215 | EbnfJavaValidator.unreferencedPassthroughRuleDescription, |
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216 | 1, |
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217 | EbnfJavaValidator.unreferencedPassthroughRuleDescription); |
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218 | } else { |
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219 | warning(EbnfJavaValidator.passthroughRuleDescription, 1, |
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220 | EbnfJavaValidator.passthroughRuleDescription); |
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221 | } |
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222 | } |
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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 | @Check(CheckType.EXPENSIVE) |
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228 | public void checkUnusedRule(Rule rule) { |
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229 | if (!checkUnusedRule) |
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230 | return; |
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231 | |
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232 | List<Rule> references = EbnfAnalysisUtils.findReferences(rule, |
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233 | resourceDescriptions); |
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234 | |
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235 | if ((references.size() == 0) && (rule.getRulenumber() != 1)) |
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236 | warning(EbnfJavaValidator.unusedRuleDescription, 1, |
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237 | EbnfJavaValidator.unusedRuleDescription); |
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238 | } |
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239 | |
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240 | // ---------------------------------------------------------------------------------------------------- |
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241 | |
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242 | private List<DefinitionList> collectDefinitionLists(CompositeNode o) { |
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243 | List<DefinitionList> list = new ArrayList<DefinitionList>(); |
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244 | |
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245 | for (int i = 0; i < o.getChildren().size(); i++) { |
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246 | AbstractNode child = o.getChildren().get(i); |
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247 | if (child.getElement() instanceof DefinitionList) { |
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248 | list.add((DefinitionList) child.getElement()); |
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249 | } |
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250 | |
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251 | if (child instanceof CompositeNode) { |
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252 | list.addAll(collectDefinitionLists((CompositeNode) child)); |
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253 | } |
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254 | } |
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255 | |
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256 | return list; |
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257 | } |
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258 | |
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259 | // ---------------------------------------------------------------------------------------------------- |
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260 | |
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261 | @Check(CheckType.EXPENSIVE) |
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262 | public void checkEqualAlternative(Rule rule) { |
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263 | if (!checkEqualAlternative) |
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264 | return; |
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265 | |
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266 | // TODO: is not per rule, but global! |
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267 | |
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268 | // quadratic! |
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269 | CompositeNode startNode = NodeUtil.getNodeAdapter(rule).getParserNode(); |
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270 | |
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271 | List<DefinitionList> definitionLists = collectDefinitionLists(startNode); |
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272 | |
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273 | for (int k = 0; k < definitionLists.size(); k++) { |
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274 | |
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275 | EList<SingleDefinition> singleDefinitions = definitionLists.get(k) |
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276 | .getSingleDefinition(); |
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277 | for (int i = 0; i < singleDefinitions.size(); i++) { |
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278 | for (int j = 0; j < singleDefinitions.size(); j++) { |
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279 | if (i == j) |
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280 | continue; |
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281 | |
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282 | SingleDefinition upper = singleDefinitions.get(i); |
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283 | SingleDefinition lower = singleDefinitions.get(j); |
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284 | CompositeNode upperNode = NodeUtil.getNodeAdapter(upper) |
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285 | .getParserNode(); |
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286 | CompositeNode lowerNode = NodeUtil.getNodeAdapter(lower) |
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287 | .getParserNode(); |
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288 | |
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289 | String upperString = upperNode.serialize().trim() |
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290 | .replaceAll("[ \t\n\r]", ""); |
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291 | String lowerString = lowerNode.serialize().trim() |
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292 | .replaceAll("[ \t\n\r]", ""); |
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293 | |
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294 | if (lowerString.equals(upperString)) |
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295 | warning(EbnfJavaValidator.equalAlternativeDescription, |
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296 | 1, |
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297 | EbnfJavaValidator.equalAlternativeDescription); |
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298 | } |
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299 | } |
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300 | } |
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301 | |
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302 | } |
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303 | |
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304 | // ---------------------------------------------------------------------------------------------------- |
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305 | |
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306 | @Check(CheckType.EXPENSIVE) |
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307 | public void checkDuplicateRules(Rule rule) { |
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308 | if (!checkDuplicateRules) |
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309 | return; |
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310 | |
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311 | EtsiBnf etsiBnfNode = (EtsiBnf) rule.eContainer().eContainer(); |
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312 | |
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313 | CompositeNode definitionList = NodeUtil.getNodeAdapter(rule.getDefinitionList()).getParserNode(); |
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314 | |
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315 | String rightHandSideText = definitionList.serialize().trim() |
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316 | .replaceAll("[ \t\n\r]", ""); |
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317 | |
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318 | for (int i = 0; i < etsiBnfNode.getBnfEntry().size(); i++) { |
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319 | BnfEntry currentNode = etsiBnfNode.getBnfEntry().get(i); |
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320 | if (currentNode == null) |
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321 | continue; |
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322 | if (currentNode.getRule() == null) |
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323 | continue; |
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324 | if (currentNode.getRule() == rule) |
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325 | continue; |
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326 | |
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327 | Rule currentRule = currentNode.getRule(); |
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328 | CompositeNode currentRuleDefinitionList = NodeUtil.getNodeAdapter(currentRule.getDefinitionList()).getParserNode(); |
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329 | String currentRuleRightHandSideText = currentRuleDefinitionList.serialize().trim() |
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330 | .replaceAll("[ \t\n\r]", ""); |
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331 | |
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332 | if (currentRuleRightHandSideText.equals(rightHandSideText)) { |
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333 | String description = EbnfJavaValidator.duplicateRulesDescription |
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334 | + " with rule \"" |
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335 | + currentRule.getName() |
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336 | + "\" (Line " |
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337 | + NodeUtil.getNodeAdapter(currentRule).getParserNode().getLine() + ")"; |
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338 | warning(description, 1, description); |
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339 | } |
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340 | } |
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341 | } |
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342 | |
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343 | // ---------------------------------------------------------------------------------------------------- |
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344 | |
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345 | @Check(CheckType.EXPENSIVE) |
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346 | public void checkSubruleDuplicates(EtsiBnf bnf) { |
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347 | if (!checkSubruleDuplicates) |
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348 | return; |
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349 | |
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350 | HashMap<String, DuplicateEntry> dupesMap = new HashMap<String, DuplicateEntry>(); |
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351 | Set<String> taggedEntries = new HashSet<String>(); |
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352 | |
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353 | // build dupes map |
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354 | for (int i=0; i < bnf.getBnfEntry().size(); i++) { |
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355 | BnfEntry currentBnfEntry = bnf.getBnfEntry().get(i); |
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356 | if ((currentBnfEntry.getRule() != null) && (currentBnfEntry.getRule().getDefinitionList() != null)) { |
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357 | |
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358 | CompositeNode ruleParserNode = NodeUtil.getNodeAdapter(currentBnfEntry.getRule().getDefinitionList()).getParserNode(); |
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359 | String ruleText = ruleParserNode.serialize().trim(); |
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360 | String processedRuleText = textSpacer(ruleText); |
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361 | |
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362 | String trimmedRuleText = processedRuleText.replaceAll("[\t\n\r]", " ").replaceAll("[ ]+", " "); |
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363 | |
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364 | String[] parts = trimmedRuleText.split(" "); |
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365 | |
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366 | for (int j=0; j <= parts.length; j++) { |
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367 | for (int k=j; k <= parts.length; k++) { |
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368 | if (isBalancedPairs(parts, j, k) && (k-j > 1)) { |
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369 | String balancedSubString = createString(parts, j, k); |
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370 | DuplicateEntry mapEntry = dupesMap.get(balancedSubString); |
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371 | if (mapEntry == null) { |
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372 | mapEntry = new DuplicateEntry(); |
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373 | mapEntry.setSnippet(balancedSubString); |
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374 | mapEntry.addRule(currentBnfEntry.getRule()); |
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375 | dupesMap.put(balancedSubString, mapEntry); |
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376 | } else { |
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377 | mapEntry.addRule(currentBnfEntry.getRule()); |
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378 | dupesMap.put(balancedSubString, mapEntry); |
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379 | taggedEntries.add(balancedSubString); |
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380 | } |
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381 | } |
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382 | } |
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383 | } |
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384 | } |
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385 | } |
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386 | |
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387 | // create longest matches |
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388 | HashMap<String, RuleDuplication> rulePairMap = new HashMap<String, RuleDuplication>(); |
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389 | Iterator<String> it = taggedEntries.iterator(); |
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390 | |
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391 | while (it.hasNext()) { |
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392 | String entry = it.next(); |
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393 | DuplicateEntry dupeEntry = dupesMap.get(entry); |
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394 | |
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395 | if (dupeEntry.getRules().size() < 2) |
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396 | continue; |
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397 | |
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398 | ArrayList<Integer> matchingLines = new ArrayList<Integer>(); |
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399 | for (int i=0; i < dupeEntry.getRules().size(); i++) { |
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400 | Rule rule = dupeEntry.getRules().get(i); |
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401 | CompositeNode parserNode = NodeUtil.getNodeAdapter(rule).getParserNode(); |
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402 | matchingLines.add(parserNode.getLine()); |
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403 | } |
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404 | |
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405 | Collections.sort(matchingLines); |
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406 | |
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407 | RuleDuplication rulePair = rulePairMap.get(matchingLines.toString()); |
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408 | if (rulePair == null) { |
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409 | rulePair = new RuleDuplication(); |
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410 | } |
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411 | rulePair.addDupe(dupeEntry); |
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412 | rulePairMap.put(matchingLines.toString(), rulePair); |
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413 | } |
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414 | |
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415 | // create warnings |
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416 | Iterator<RuleDuplication> it2 = rulePairMap.values().iterator(); |
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417 | |
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418 | while (it2.hasNext()) { |
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419 | RuleDuplication rulePair = it2.next(); |
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420 | List<DuplicateEntry> dupes = rulePair.getFilteredDupes(); |
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421 | |
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422 | for (int i=0; i < dupes.size(); i++) { |
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423 | DuplicateEntry dupeEntry = dupes.get(i); |
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424 | |
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425 | String warningText = ""; |
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426 | warningText += ">>" + dupeEntry.getSnippet() + "<< is duplicated in the following rules: "; |
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427 | for (int j=0; j < dupeEntry.getRules().size(); j++) { |
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428 | Rule rule = dupeEntry.getRules().get(j); |
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429 | CompositeNode parserNode = NodeUtil.getNodeAdapter(rule).getParserNode(); |
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430 | |
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431 | if (rule.getRulenumber() > 0) { |
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432 | String ruleNumber = Integer.toString(rule.getRulenumber()).replaceAll("[ \t\n\r]", ""); |
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433 | warningText += ruleNumber; |
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434 | } |
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435 | warningText += " (Line "; |
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436 | warningText += parserNode.getLine(); |
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437 | warningText += ")"; |
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438 | |
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439 | if (j+1 < dupeEntry.getRules().size()) |
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440 | warningText += ", "; |
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441 | |
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442 | } |
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443 | |
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444 | Rule rule = dupeEntry.getRules().get(0); |
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445 | CompositeNode parserNode = NodeUtil.getNodeAdapter(rule).getParserNode(); |
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446 | warning(warningText, parserNode.getElement(), 1); |
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447 | } |
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448 | } |
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449 | } |
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450 | |
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451 | private String textSpacer(String ruleText) { |
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452 | ruleText = ruleText + " "; |
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453 | String processedRuleText = ruleText.replaceAll("([^\"])\\(([^\"])", "$1 ( $2"); // ( case 1 |
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454 | processedRuleText = processedRuleText.replaceAll("\\(([^\"])", " ( $1"); // ( case 2 |
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455 | processedRuleText = processedRuleText.replaceAll("([^\"])\\(\"", "$1 ( \""); // ( case 3 |
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456 | |
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457 | processedRuleText = processedRuleText.replaceAll("([^\"])\\)([^\"])", "$1 ) $2"); // ) case 1 |
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458 | processedRuleText = processedRuleText.replaceAll("\\)([^\"])", " ) $1"); // ) case 2 |
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459 | processedRuleText = processedRuleText.replaceAll("\"\\)([^\"])", "\" ) $1"); // ) case 3 |
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460 | |
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461 | processedRuleText = processedRuleText.replaceAll("([^\"])\\{([^\"])", "$1 { $2"); // { case 1 |
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462 | processedRuleText = processedRuleText.replaceAll("\\{([^\"])", " { $1"); // { case 2 |
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463 | processedRuleText = processedRuleText.replaceAll("([^\"])\\{\"", "$1 { \""); // { case 3 |
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464 | |
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465 | processedRuleText = processedRuleText.replaceAll("([^\"])\\}([^\\+\"])", "$1 } $2"); // } case 1 |
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466 | processedRuleText = processedRuleText.replaceAll("\\}([^\\+\"])", " } $1"); // } case 2 |
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467 | processedRuleText = processedRuleText.replaceAll("\"\\}([^\\+\"])", "\" } $1"); // } case 3 |
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468 | |
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469 | processedRuleText = processedRuleText.replaceAll("([^\"])\\}\\+([^\"])", "$1 }\\+ $2"); // }+ case 1 |
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470 | processedRuleText = processedRuleText.replaceAll("\\}\\+([^\"])", " }\\+ $1 "); // }+ case 2 |
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471 | processedRuleText = processedRuleText.replaceAll("\"\\}\\+([^\"])", "\" }\\+ $1 "); // }+ case 3 |
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472 | |
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473 | processedRuleText = processedRuleText.replaceAll("([^\"])\\[([^\"])", "$1 [ $2"); // [ case 1 |
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474 | processedRuleText = processedRuleText.replaceAll("\\[([^\"])", " [ $1"); // [ case 2 |
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475 | processedRuleText = processedRuleText.replaceAll("([^\"])\\[\"", "$1 [ \""); // [ case 3 |
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476 | |
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477 | processedRuleText = processedRuleText.replaceAll("([^\"])\\]([^\"])", "$1 ] $2"); // ] case 1 |
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478 | processedRuleText = processedRuleText.replaceAll("\\]([^\"])", " ] $1"); // ] case 2 |
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479 | processedRuleText = processedRuleText.replaceAll("\"\\]([^\"])", "\" ] $1"); // ] case 3 |
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480 | return processedRuleText; |
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481 | } |
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482 | |
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483 | private boolean isBalancedPairs(String[] parts, int start, int end) { |
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484 | Stack<String> pairStack = new Stack<String>(); |
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485 | |
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486 | if (start == end) |
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487 | return false; |
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488 | |
---|
489 | if (parts[start].contains("|")) |
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490 | return false; |
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491 | |
---|
492 | if (parts[start].contains("}")) |
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493 | return false; |
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494 | |
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495 | if (parts[start].contains("}+")) |
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496 | return false; |
---|
497 | |
---|
498 | if (parts[start].contains("]")) |
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499 | return false; |
---|
500 | |
---|
501 | if (parts[end-1].contains("|")) |
---|
502 | return false; |
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503 | |
---|
504 | for (int i=start; i < end; i++) { |
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505 | String currentPart = parts[i]; |
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506 | if (currentPart.equals("(") || currentPart.equals("{") || currentPart.equals("[")) { |
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507 | pairStack.push(currentPart); |
---|
508 | } |
---|
509 | |
---|
510 | if (!pairStack.isEmpty()) { |
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511 | if (currentPart.equals(")") && pairStack.peek().equals("(")) { |
---|
512 | pairStack.pop(); |
---|
513 | } else if (currentPart.equals("}") && pairStack.peek().equals("{")) { |
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514 | pairStack.pop(); |
---|
515 | } else if (currentPart.equals("}+") && pairStack.peek().equals("{")) { |
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516 | pairStack.pop(); |
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517 | } else if (currentPart.equals("]") && pairStack.peek().equals("[")) { |
---|
518 | pairStack.pop(); |
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519 | } |
---|
520 | } else { |
---|
521 | if (currentPart.equals(")") || currentPart.equals("}") || currentPart.equals("}+") || currentPart.equals("]")) { |
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522 | return false; |
---|
523 | } |
---|
524 | } |
---|
525 | } |
---|
526 | |
---|
527 | if (pairStack.empty()) |
---|
528 | return true; |
---|
529 | |
---|
530 | return false; |
---|
531 | |
---|
532 | } |
---|
533 | |
---|
534 | private String createString(String[] parts, int start, int end) { |
---|
535 | StringBuffer result = new StringBuffer(); |
---|
536 | |
---|
537 | for (int i=start; i < end; i++) { |
---|
538 | result.append(parts[i]); |
---|
539 | result.append(" "); |
---|
540 | } |
---|
541 | |
---|
542 | return result.toString().trim(); |
---|
543 | } |
---|
544 | |
---|
545 | } |
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