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67073f0a EK |
1 | package no.uio.ifi.refaktor.extractors; |
2 | ||
2c782b57 VS |
3 | import java.util.Collections; |
4 | import java.util.Comparator; | |
3db313c8 EK |
5 | import java.util.LinkedList; |
6 | import java.util.List; | |
7 | ||
8 | import no.uio.ifi.refaktor.utils.ParseUtils; | |
9 | ||
10 | import org.eclipse.jdt.core.dom.ASTMatcher; | |
11 | import org.eclipse.jdt.core.dom.ASTNode; | |
12 | import org.eclipse.jdt.core.dom.ASTVisitor; | |
4c03afae EK |
13 | import org.eclipse.jdt.core.dom.AbstractTypeDeclaration; |
14 | import org.eclipse.jdt.core.dom.CompilationUnit; | |
3db313c8 | 15 | import org.eclipse.jdt.core.dom.Expression; |
0311e2cb EK |
16 | import org.eclipse.jdt.core.dom.IBinding; |
17 | import org.eclipse.jdt.core.dom.IVariableBinding; | |
18 | import org.eclipse.jdt.core.dom.Name; | |
3db313c8 EK |
19 | import org.eclipse.jface.text.IDocument; |
20 | ||
7a978020 EK |
21 | /** |
22 | * A class for representing a prefix of an Expression/Statement. | |
23 | * | |
24 | * It has an Expression member for the prefix. | |
25 | */ | |
67073f0a EK |
26 | public class Prefix { |
27 | ||
3db313c8 EK |
28 | private class SubExpressionsFinder extends ASTVisitor { |
29 | ||
30 | private Expression topExpression; | |
31 | private LinkedList<Expression> expressions; | |
32 | ||
33 | public SubExpressionsFinder(Expression expression) { | |
34 | this.topExpression = expression; | |
35 | this.expressions = new LinkedList<Expression>(); | |
36 | if (expression != null) | |
37 | expression.accept(this); | |
38 | } | |
adbe9243 | 39 | |
3db313c8 EK |
40 | @Override |
41 | public void preVisit(ASTNode node) { | |
6d7256a3 | 42 | if (nodeIsSubExpressionOfTopExpression(node)) |
3db313c8 EK |
43 | expressions.add((Expression) node); |
44 | } | |
45 | ||
6d7256a3 EK |
46 | private boolean nodeIsSubExpressionOfTopExpression(ASTNode node) { |
47 | return node instanceof Expression && node.getStartPosition() == topExpression.getStartPosition(); | |
48 | } | |
49 | ||
3db313c8 EK |
50 | public List<Expression> getExpressions() { |
51 | return expressions; | |
52 | } | |
53 | ||
54 | } | |
55 | ||
56 | private final Expression prefixExpression; | |
2c782b57 | 57 | private final IDocument document; |
3db313c8 | 58 | private final String prefixString; |
67073f0a | 59 | private int count; |
adbe9243 | 60 | private PrefixSet possiblePrefixes; |
67073f0a | 61 | |
6d7256a3 EK |
62 | /** |
63 | * Represent a prefix on the base of an Expression. | |
64 | * | |
65 | * @param expression the Expression that is the base of the prefix. | |
7a978020 EK |
66 | * @param document the IDocument that is the base of the source code |
67 | * that contains the expression. | |
6d7256a3 | 68 | */ |
7a978020 | 69 | public Prefix(Expression expression, IDocument document) { |
3db313c8 EK |
70 | this.prefixExpression = expression; |
71 | this.document = document; | |
67073f0a | 72 | this.count = 1; |
3db313c8 EK |
73 | |
74 | if (expression != null) | |
75 | prefixString = ParseUtils.getNodeText(expression, document); | |
76 | else prefixString = ""; | |
67073f0a EK |
77 | } |
78 | ||
79 | public void incrementCount() { | |
80 | count++; | |
81 | } | |
82 | ||
3db313c8 EK |
83 | @Override |
84 | public String toString() { | |
087a79bf EK |
85 | return getPrefixString(); |
86 | } | |
87 | ||
88 | public String getPrefixString() { | |
3db313c8 | 89 | return prefixString; |
67073f0a EK |
90 | } |
91 | ||
92 | public int getCount() { | |
93 | return count; | |
94 | } | |
3db313c8 | 95 | |
6d7256a3 EK |
96 | /** |
97 | * Intersect this prefix with another prefix. | |
98 | * | |
99 | * @param other the prefix to intersect with this one. | |
100 | * @return If the Prefix is empty, the null-prefix will be returned. | |
101 | * If other is equal to this, a copy of this will be returned, | |
102 | * or else the longest common prefix of other and this is returned. | |
103 | */ | |
3db313c8 | 104 | public Prefix intersectWith(Prefix other) { |
6d7256a3 | 105 | if (prefixIsEmpty(other)) |
7a978020 | 106 | return new Prefix(null, document); |
3db313c8 | 107 | if (this.equals(other)) |
6d7256a3 | 108 | // TODO: return this? |
7a978020 | 109 | return new Prefix(prefixExpression, document); |
adbe9243 | 110 | |
0311e2cb | 111 | // TODO: statement?? |
7a978020 | 112 | return new Prefix(longestCommonExpressionWith(other), document); |
6d7256a3 EK |
113 | } |
114 | ||
115 | private boolean prefixIsEmpty(Prefix prefix) { | |
116 | return prefix == null || prefix.getPrefixExpression() == null; | |
117 | } | |
118 | ||
64970e7f | 119 | public Expression longestCommonExpressionWith(Prefix other) { |
3db313c8 | 120 | Expression longestCommonExpression = null; |
adbe9243 | 121 | |
3db313c8 EK |
122 | for (Expression thisExp: getSubExpressions(prefixExpression)) { |
123 | for (Expression otherExp: getSubExpressions(other.getPrefixExpression())) { | |
124 | if (expressionsMatch(otherExp, thisExp)) { | |
125 | if (longestCommonExpression == null) { | |
126 | longestCommonExpression = thisExp; | |
127 | } else if (thisExp.getLength() > longestCommonExpression.getLength()) { | |
128 | longestCommonExpression = thisExp; | |
129 | } | |
130 | break; | |
131 | } | |
132 | } | |
133 | } | |
6d7256a3 | 134 | return longestCommonExpression; |
3db313c8 | 135 | } |
adbe9243 | 136 | |
3db313c8 | 137 | private List<Expression> getSubExpressions(Expression expression) { |
6d7256a3 | 138 | return new SubExpressionsFinder(expression).getExpressions(); |
3db313c8 | 139 | } |
adbe9243 | 140 | |
087a79bf EK |
141 | @Override |
142 | public int hashCode() { | |
143 | return getPrefixString().hashCode(); | |
144 | } | |
3db313c8 | 145 | |
087a79bf | 146 | @Override |
3db313c8 EK |
147 | public boolean equals(Object other) { |
148 | if (this == other) | |
149 | return true; | |
150 | if (other == null || !(other instanceof Prefix)) | |
151 | return false; | |
087a79bf EK |
152 | return hasExpressionEqualTo((Prefix) other); |
153 | } | |
154 | ||
155 | private boolean hasExpressionEqualTo(Prefix other) { | |
156 | Expression otherPrefixExpression = other.getPrefixExpression(); | |
adbe9243 | 157 | |
3db313c8 EK |
158 | if (prefixExpression == null && otherPrefixExpression == null) |
159 | return true; | |
087a79bf | 160 | if (prefixExpression == null || otherPrefixExpression == null) |
3db313c8 EK |
161 | return false; |
162 | return expressionsMatch(prefixExpression, otherPrefixExpression); | |
163 | } | |
164 | ||
165 | private boolean expressionsMatch(Expression a, Expression b) { | |
166 | if (a == null || b == null) | |
167 | return false; | |
168 | return a.subtreeMatch(new ASTMatcher(), b); | |
169 | } | |
170 | ||
171 | private Expression getPrefixExpression() { | |
172 | return prefixExpression; | |
173 | } | |
adbe9243 | 174 | |
6d7256a3 EK |
175 | /** |
176 | * @return the list of possible sub-prefixes, including a copy of this one. | |
177 | */ | |
0d284c26 | 178 | public PrefixSet getSubPrefixes() { |
adbe9243 EK |
179 | if (possiblePrefixes == null) { |
180 | possiblePrefixes = new PrefixSet(); | |
181 | for (Expression exp: getSubExpressions(prefixExpression)) | |
7a978020 | 182 | possiblePrefixes.add(new Prefix(exp, document)); |
adbe9243 | 183 | } |
3db313c8 EK |
184 | return possiblePrefixes; |
185 | } | |
4c03afae EK |
186 | |
187 | public int length() { | |
188 | return prefixExpression.getLength(); | |
189 | } | |
190 | ||
191 | public int startPosition() { | |
192 | return prefixExpression.getStartPosition(); | |
193 | } | |
194 | ||
195 | public String getPackageName() { | |
196 | return getCompilationUnit().getPackage().getName().getFullyQualifiedName(); | |
197 | } | |
198 | ||
199 | public String getSimpleTypeName() { | |
200 | List<?> types = getCompilationUnit().types(); | |
201 | if (types.isEmpty()) | |
202 | return null; | |
203 | Object first = types.get(0); | |
204 | assert first instanceof AbstractTypeDeclaration; | |
205 | AbstractTypeDeclaration absTypeDecl = (AbstractTypeDeclaration) first; | |
206 | return absTypeDecl.getName().getFullyQualifiedName(); | |
207 | } | |
adbe9243 | 208 | |
4c03afae EK |
209 | private CompilationUnit getCompilationUnit() { |
210 | ASTNode root = prefixExpression.getRoot(); | |
211 | assert root instanceof CompilationUnit; | |
212 | return (CompilationUnit) root; | |
213 | } | |
214 | ||
2c782b57 VS |
215 | public IVariableBinding getVariableBindingOfFirstExpression() { |
216 | Expression firstExpression = getFirstExpression(); | |
217 | assert firstExpression instanceof Name; | |
adbe9243 | 218 | IBinding binding = ((Name) firstExpression).resolveBinding(); |
0311e2cb EK |
219 | assert binding != null; |
220 | assert binding instanceof IVariableBinding; | |
221 | return (IVariableBinding) binding; | |
222 | } | |
223 | ||
adbe9243 | 224 | private Expression getFirstExpression() { |
2c782b57 VS |
225 | List<Expression> subExpressions = getSubExpressions(prefixExpression); |
226 | Collections.sort(subExpressions, new Comparator<Expression>() { | |
227 | @Override | |
228 | public int compare(Expression e1, Expression e2) { | |
229 | if (e1.getLength() < e2.getLength()) | |
230 | return -1; | |
231 | else if (e1.getLength() > e2.getLength()) | |
232 | return 1; | |
233 | else | |
234 | return 0; | |
235 | } | |
236 | }); | |
237 | return subExpressions.get(0); | |
238 | } | |
239 | ||
7a978020 EK |
240 | /** |
241 | * Tests if this prefix encloses another prefix. | |
242 | * | |
243 | * Example: "a.b.c" encloses "a.b" | |
244 | * @param other | |
245 | * @return | |
246 | */ | |
247 | public boolean encloses(Prefix other) { | |
486b6bc4 | 248 | return getSubPrefixes().contains(other); |
062df6c3 EK |
249 | } |
250 | ||
4c537a5a | 251 | } |