| 1 | package de.ugoe.cs.swe.bnftools.analysis;
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| 2 |
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| 3 | import java.util.ArrayList;
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| 4 | import java.util.List;
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| 5 |
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| 6 | import org.eclipse.xtext.resource.IReferenceDescription;
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| 7 | import org.eclipse.xtext.resource.IResourceDescription;
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| 8 | import org.eclipse.xtext.resource.IResourceDescriptions;
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| 9 |
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| 10 | import de.ugoe.cs.swe.bnftools.ebnf.Atom;
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| 11 | import de.ugoe.cs.swe.bnftools.ebnf.DefinitionList;
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| 12 | import de.ugoe.cs.swe.bnftools.ebnf.Rule;
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| 13 | import de.ugoe.cs.swe.bnftools.ebnf.RuleReference;
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| 14 | import de.ugoe.cs.swe.bnftools.ebnf.SingleDefinition;
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| 15 | import de.ugoe.cs.swe.bnftools.ebnf.StringRule;
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| 16 | import de.ugoe.cs.swe.bnftools.ebnf.Term;
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| 17 |
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| 18 | public class EbnfAnalysisUtils {
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| 19 |
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| 20 | //----------------------------------------------------------------------------------------------------
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| 21 |
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| 22 | static public boolean isPassthroughRule(Rule rule) {
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| 23 | DefinitionList definitionList = rule.getDefinitionList();
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| 24 | if (definitionList == null)
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| 25 | return false;
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| 26 |
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| 27 | if (rule.getDefinitionList().getSingleDefinition().size() == 1) {
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| 28 | SingleDefinition element = rule.getDefinitionList().getSingleDefinition().get(0);
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| 29 | if (element.getTerms().size() == 1) {
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| 30 | Term first = element.getTerms().get(0);
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| 31 | if (first.getTermAtom() != null) {
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| 32 | Atom atom = (Atom) first.getTermAtom();
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| 33 | if (atom.getAtomRuleReference() != null)
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| 34 | return true;
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| 35 | }
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| 36 | }
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| 37 | }
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| 38 |
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| 39 | return false;
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| 40 | }
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| 41 |
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| 42 | //----------------------------------------------------------------------------------------------------
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| 43 |
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| 44 | static public RuleReference getPassthroughRuleReference(Rule rule) {
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| 45 | DefinitionList definitionList = rule.getDefinitionList();
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| 46 | if (definitionList == null)
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| 47 | return null;
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| 48 |
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| 49 | if (rule.getDefinitionList().getSingleDefinition().size() == 1) {
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| 50 | SingleDefinition element = rule.getDefinitionList().getSingleDefinition().get(0);
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| 51 | if (element.getTerms().size() == 1) {
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| 52 | Term first = element.getTerms().get(0);
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| 53 | if (first.getTermAtom() != null) {
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| 54 | Atom atom = (Atom) first.getTermAtom();
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| 55 | if (atom.getAtomRuleReference() != null)
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| 56 | return atom.getAtomRuleReference();
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| 57 | }
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| 58 | }
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| 59 | }
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| 60 |
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| 61 | return null;
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| 62 | }
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| 63 |
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| 64 | //----------------------------------------------------------------------------------------------------
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| 65 |
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| 66 | static public boolean isTokenRule(Rule rule) {
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| 67 | DefinitionList definitionList = rule.getDefinitionList();
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| 68 | if (definitionList == null)
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| 69 | return false;
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| 70 |
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| 71 | if (rule.getDefinitionList().getSingleDefinition().size() == 1) {
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| 72 | SingleDefinition element = rule.getDefinitionList().getSingleDefinition().get(0);
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| 73 | if (element.getTerms().size() == 1) {
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| 74 | Term first = element.getTerms().get(0);
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| 75 | Atom atom = first.getTermAtom();
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| 76 | if (atom != null && atom.getAtomStringRule() != null) {
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| 77 | return true;
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| 78 | }
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| 79 | }
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| 80 | }
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| 81 |
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| 82 | return false;
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| 83 | }
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| 84 |
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| 85 | //----------------------------------------------------------------------------------------------------
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| 86 |
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| 87 | static public StringRule getTokenRuleTerminal(Rule rule) {
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| 88 | DefinitionList definitionList = rule.getDefinitionList();
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| 89 | if (definitionList == null)
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| 90 | return null;
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| 91 |
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| 92 | if (rule.getDefinitionList().getSingleDefinition().size() == 1) {
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| 93 | SingleDefinition element = rule.getDefinitionList().getSingleDefinition().get(0);
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| 94 | if (element.getTerms().size() == 1) {
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| 95 | Term first = element.getTerms().get(0);
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| 96 | if ((first.getTermAtom() != null) && (first.getTermAtom().getAtomStringRule() != null)) {
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| 97 | StringRule stringRule = first.getTermAtom().getAtomStringRule();
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| 98 | return stringRule;
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| 99 | }
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| 100 | }
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| 101 | }
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| 102 |
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| 103 | return null;
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| 104 | }
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| 105 |
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| 106 | //----------------------------------------------------------------------------------------------------
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| 107 |
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| 108 | static public List<Rule> findReferences(Rule rule, IResourceDescriptions resourceDescriptions) {
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| 109 | List<Rule> ruleReferences = new ArrayList<Rule>();
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| 110 |
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| 111 | final String ruleURIF = rule.eResource().getURIFragment(rule);
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| 112 |
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| 113 | for (IResourceDescription resourceDescription : resourceDescriptions
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| 114 | .getAllResourceDescriptions()) {
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| 115 | if (!resourceDescription.getURI().equals(rule.eResource().getURI()))
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| 116 | continue;
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| 117 |
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| 118 | for (IReferenceDescription referenceDescription : resourceDescription
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| 119 | .getReferenceDescriptions()) {
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| 120 | if (ruleURIF.equals(referenceDescription.getTargetEObjectUri()
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| 121 | .fragment())) {
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| 122 | ruleReferences.add((Rule) rule.eResource().getEObject(referenceDescription.getTargetEObjectUri().fragment()));
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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 | return ruleReferences;
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| 128 | }
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| 129 |
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| 130 | }
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