1 | package de.ugoe.cs.swe.bnftools.visitor;
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2 |
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3 | import java.util.Stack;
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4 |
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5 | import org.eclipse.emf.ecore.EObject;
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6 |
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7 | import de.ugoe.cs.swe.bnftools.ebnf.Atom;
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8 | import de.ugoe.cs.swe.bnftools.ebnf.BnfEntry;
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9 | import de.ugoe.cs.swe.bnftools.ebnf.DefinitionList;
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10 | import de.ugoe.cs.swe.bnftools.ebnf.DeltaEntry;
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11 | import de.ugoe.cs.swe.bnftools.ebnf.EtsiBnf;
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12 | import de.ugoe.cs.swe.bnftools.ebnf.ExtRule;
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13 | import de.ugoe.cs.swe.bnftools.ebnf.GlobalCombinator;
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14 | import de.ugoe.cs.swe.bnftools.ebnf.GroupedSequence;
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15 | import de.ugoe.cs.swe.bnftools.ebnf.HookCombinator;
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16 | import de.ugoe.cs.swe.bnftools.ebnf.Import;
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17 | import de.ugoe.cs.swe.bnftools.ebnf.ImportSection;
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18 | import de.ugoe.cs.swe.bnftools.ebnf.MergeEntry;
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19 | import de.ugoe.cs.swe.bnftools.ebnf.MergeRule;
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20 | import de.ugoe.cs.swe.bnftools.ebnf.OptionalSequence;
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21 | import de.ugoe.cs.swe.bnftools.ebnf.RepeatedSequence;
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22 | import de.ugoe.cs.swe.bnftools.ebnf.Rule;
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23 | import de.ugoe.cs.swe.bnftools.ebnf.RuleCombinator;
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24 | import de.ugoe.cs.swe.bnftools.ebnf.RuleReference;
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25 | import de.ugoe.cs.swe.bnftools.ebnf.SectionHeading;
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26 | import de.ugoe.cs.swe.bnftools.ebnf.SingleDefinition;
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27 | import de.ugoe.cs.swe.bnftools.ebnf.StringRule;
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28 | import de.ugoe.cs.swe.bnftools.ebnf.Term;
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29 |
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30 | public abstract class EbnfVisitor {
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31 |
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32 | protected EObject rootNode = null;
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33 | protected Stack<Boolean> lastElementStack = new Stack<Boolean>();
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34 |
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35 | public EbnfVisitor() {
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36 | }
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37 |
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38 | public EbnfVisitor(EObject rootNode) {
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39 | this.rootNode = rootNode;
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40 | }
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41 |
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42 | public void accept() {
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43 | if (rootNode != null)
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44 | accept(rootNode);
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45 | }
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46 |
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47 | public void accept(EObject node) {
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48 | dispatcherBefore(node);
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49 | acceptInner(node);
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50 | dispatcherAfter(node);
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51 | }
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52 |
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53 | private void acceptInner(EObject node) {
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54 | Boolean lastElement = false;
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55 | if (node.eContents().size() == 0)
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56 | lastElement = true;
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57 | lastElementStack.push(lastElement);
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58 | for (int i=0; i < node.eContents().size(); i++) {
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59 | EObject currentNode = (EObject) node.eContents().get(i);
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60 | if (i == node.eContents().size()-1) {
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61 | lastElement = true;
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62 | lastElementStack.pop();
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63 | lastElementStack.push(lastElement);
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64 | }
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65 | dispatcherBefore(currentNode);
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66 | acceptInner(currentNode);
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67 | dispatcherAfter(currentNode);
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68 | }
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69 | lastElementStack.pop();
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70 | }
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71 |
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72 | protected boolean isLastElement() {
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73 | return lastElementStack.peek();
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74 | }
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75 |
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76 | protected void dispatcherBefore(EObject node) {
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77 | // ugly, but no time to find a prettier solution
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78 | if (node instanceof EtsiBnf) {
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79 | visitBefore((EtsiBnf) node);
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80 | } else if (node instanceof ImportSection) {
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81 | visitBefore((ImportSection) node);
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82 | } else if (node instanceof BnfEntry) {
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83 | visitBefore((BnfEntry) node);
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84 | } else if (node instanceof DeltaEntry) {
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85 | visitBefore((DeltaEntry) node);
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86 | } else if (node instanceof MergeEntry) {
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87 | visitBefore((MergeEntry) node);
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88 | } else if (node instanceof Atom) {
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89 | visitBefore((Atom) node);
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90 | } else if (node instanceof DefinitionList) {
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91 | visitBefore((DefinitionList) node);
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92 | } else if (node instanceof ExtRule) {
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93 | visitBefore((ExtRule) node);
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94 | } else if (node instanceof GlobalCombinator) {
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95 | visitBefore((GlobalCombinator) node);
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96 | } else if (node instanceof GroupedSequence) {
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97 | visitBefore((GroupedSequence) node);
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98 | } else if (node instanceof HookCombinator) {
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99 | visitBefore((HookCombinator) node);
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100 | } else if (node instanceof Import) {
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101 | visitBefore((Import) node);
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102 | } else if (node instanceof MergeRule) {
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103 | visitBefore((MergeRule) node);
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104 | } else if (node instanceof OptionalSequence) {
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105 | visitBefore((OptionalSequence) node);
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106 | } else if (node instanceof RepeatedSequence) {
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107 | visitBefore((RepeatedSequence) node);
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108 | } else if (node instanceof Rule) {
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109 | visitBefore((Rule) node);
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110 | } else if (node instanceof RuleCombinator) {
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111 | visitBefore((RuleCombinator) node);
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112 | } else if (node instanceof RuleReference) {
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113 | visitBefore((RuleReference) node);
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114 | } else if (node instanceof SectionHeading) {
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115 | visitBefore((SectionHeading) node);
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116 | } else if (node instanceof SingleDefinition) {
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117 | visitBefore((SingleDefinition) node);
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118 | } else if (node instanceof StringRule) {
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119 | visitBefore((StringRule) node);
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120 | } else if (node instanceof Term) {
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121 | visitBefore((Term) node);
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122 | }
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123 | }
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124 |
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125 | protected void dispatcherAfter(EObject node) {
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126 | // ugly, but no time to find a prettier solution
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127 | if (node instanceof EtsiBnf) {
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128 | visitAfter((EtsiBnf) node);
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129 | } else if (node instanceof ImportSection) {
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130 | visitAfter((ImportSection) node);
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131 | } else if (node instanceof BnfEntry) {
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132 | visitAfter((BnfEntry) node);
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133 | } else if (node instanceof DeltaEntry) {
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134 | visitAfter((DeltaEntry) node);
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135 | } else if (node instanceof MergeEntry) {
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136 | visitAfter((MergeEntry) node);
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137 | } else if (node instanceof Atom) {
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138 | visitAfter((Atom) node);
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139 | } else if (node instanceof DefinitionList) {
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140 | visitAfter((DefinitionList) node);
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141 | } else if (node instanceof ExtRule) {
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142 | visitAfter((ExtRule) node);
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143 | } else if (node instanceof GlobalCombinator) {
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144 | visitAfter((GlobalCombinator) node);
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145 | } else if (node instanceof GroupedSequence) {
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146 | visitAfter((GroupedSequence) node);
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147 | } else if (node instanceof HookCombinator) {
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148 | visitAfter((HookCombinator) node);
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149 | } else if (node instanceof Import) {
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150 | visitAfter((Import) node);
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151 | } else if (node instanceof MergeRule) {
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152 | visitAfter((MergeRule) node);
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153 | } else if (node instanceof OptionalSequence) {
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154 | visitAfter((OptionalSequence) node);
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155 | } else if (node instanceof RepeatedSequence) {
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156 | visitAfter((RepeatedSequence) node);
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157 | } else if (node instanceof Rule) {
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158 | visitAfter((Rule) node);
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159 | } else if (node instanceof RuleCombinator) {
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160 | visitAfter((RuleCombinator) node);
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161 | } else if (node instanceof RuleReference) {
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162 | visitAfter((RuleReference) node);
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163 | } else if (node instanceof SectionHeading) {
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164 | visitAfter((SectionHeading) node);
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165 | } else if (node instanceof SingleDefinition) {
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166 | visitAfter((SingleDefinition) node);
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167 | } else if (node instanceof StringRule) {
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168 | visitAfter((StringRule) node);
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169 | } else if (node instanceof Term) {
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170 | visitAfter((Term) node);
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171 | }
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172 | }
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173 |
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174 | protected void visitBefore(EtsiBnf node) {
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175 | }
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176 |
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177 | protected void visitAfter(EtsiBnf node) {
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178 | }
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179 |
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180 | protected void visitBefore(ImportSection node) {
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181 | }
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182 |
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183 | protected void visitAfter(ImportSection node) {
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184 | }
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185 |
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186 | protected void visitBefore(BnfEntry node) {
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187 | }
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188 |
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189 | protected void visitAfter(BnfEntry node) {
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190 | }
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191 |
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192 | protected void visitBefore(DeltaEntry node) {
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193 | }
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194 |
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195 | protected void visitAfter(DeltaEntry node) {
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196 | }
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197 |
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198 | protected void visitBefore(MergeEntry node) {
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199 | }
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200 |
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201 | protected void visitAfter(MergeEntry node) {
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202 | }
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203 |
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204 | protected void visitBefore(Atom node) {
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205 | }
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206 |
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207 | protected void visitAfter(Atom node) {
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208 | }
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209 |
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210 | protected void visitBefore(Term node) {
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211 | }
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212 |
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213 | protected void visitAfter(Term node) {
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214 | }
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215 |
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216 | protected void visitBefore(DefinitionList node) {
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217 | }
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218 |
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219 | protected void visitAfter(DefinitionList node) {
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220 | }
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221 |
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222 | protected void visitBefore(ExtRule node) {
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223 | }
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224 |
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225 | protected void visitAfter(ExtRule node) {
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226 | }
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227 |
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228 | protected void visitBefore(GlobalCombinator node) {
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229 | }
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230 |
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231 | protected void visitAfter(GlobalCombinator node) {
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232 | }
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233 |
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234 | protected void visitBefore(GroupedSequence node) {
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235 | }
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236 |
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237 | protected void visitAfter(GroupedSequence node) {
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238 | }
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239 |
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240 | protected void visitBefore(HookCombinator node) {
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241 | }
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242 |
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243 | protected void visitAfter(HookCombinator node) {
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244 | }
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245 |
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246 | protected void visitBefore(Import node) {
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247 | }
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248 |
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249 | protected void visitAfter(Import node) {
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250 | }
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251 |
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252 | protected void visitBefore(MergeRule node) {
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253 | }
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254 |
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255 | protected void visitAfter(MergeRule node) {
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256 | }
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257 |
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258 | protected void visitBefore(OptionalSequence node) {
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259 | }
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260 |
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261 | protected void visitAfter(OptionalSequence node) {
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262 | }
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263 |
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264 | protected void visitBefore(RepeatedSequence node) {
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265 | }
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266 |
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267 | protected void visitAfter(RepeatedSequence node) {
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268 | }
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269 |
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270 | protected void visitBefore(Rule node) {
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271 | }
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272 |
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273 | protected void visitAfter(Rule node) {
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274 | }
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275 |
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276 | protected void visitBefore(RuleCombinator node) {
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277 | }
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278 |
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279 | protected void visitAfter(RuleCombinator node) {
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280 | }
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281 |
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282 | protected void visitBefore(RuleReference node) {
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283 | }
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284 |
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285 | protected void visitAfter(RuleReference node) {
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286 | }
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287 |
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288 | protected void visitBefore(SectionHeading node) {
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289 | }
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290 |
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291 | protected void visitAfter(SectionHeading node) {
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292 | }
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293 |
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294 | protected void visitBefore(SingleDefinition node) {
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295 | }
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296 |
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297 | protected void visitAfter(SingleDefinition node) {
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298 | }
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299 |
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300 | protected void visitBefore(StringRule node) {
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301 | }
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302 |
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303 | protected void visitAfter(StringRule node) {
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304 | }
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305 |
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306 | }
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