cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * Copyright (c) 2006 Oracle Corporation. |
| 3 | * All rights reserved. This program and the accompanying materials |
| 4 | * are made available under the terms of the Eclipse Public License v1.0 |
| 5 | * which accompanies this distribution, and is available at |
| 6 | * http://www.eclipse.org/legal/epl-v10.html |
| 7 | * |
| 8 | * Contributors: |
| 9 | * Cameron Bateman/Oracle - initial API and implementation |
| 10 | * |
| 11 | ********************************************************************************/ |
| 12 | |
| 13 | package org.eclipse.jst.jsf.core.internal.contentassist.el; |
| 14 | |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 15 | import org.eclipse.jface.text.Region; |
| 16 | import org.eclipse.jst.jsf.context.structureddocument.IStructuredDocumentContext; |
| 17 | import org.eclipse.jst.jsf.context.symbol.ISymbol; |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 18 | import org.eclipse.jst.jsp.core.internal.java.jspel.ASTAddExpression; |
| 19 | import org.eclipse.jst.jsp.core.internal.java.jspel.ASTAndExpression; |
| 20 | import org.eclipse.jst.jsp.core.internal.java.jspel.ASTChoiceExpression; |
| 21 | import org.eclipse.jst.jsp.core.internal.java.jspel.ASTEqualityExpression; |
| 22 | import org.eclipse.jst.jsp.core.internal.java.jspel.ASTExpression; |
| 23 | import org.eclipse.jst.jsp.core.internal.java.jspel.ASTFunctionInvocation; |
| 24 | import org.eclipse.jst.jsp.core.internal.java.jspel.ASTLiteral; |
| 25 | import org.eclipse.jst.jsp.core.internal.java.jspel.ASTMultiplyExpression; |
| 26 | import org.eclipse.jst.jsp.core.internal.java.jspel.ASTOrExpression; |
| 27 | import org.eclipse.jst.jsp.core.internal.java.jspel.ASTRelationalExpression; |
| 28 | import org.eclipse.jst.jsp.core.internal.java.jspel.ASTUnaryExpression; |
| 29 | import org.eclipse.jst.jsp.core.internal.java.jspel.ASTValue; |
| 30 | import org.eclipse.jst.jsp.core.internal.java.jspel.ASTValuePrefix; |
| 31 | import org.eclipse.jst.jsp.core.internal.java.jspel.ASTValueSuffix; |
| 32 | import org.eclipse.jst.jsp.core.internal.java.jspel.JSPELParser; |
| 33 | import org.eclipse.jst.jsp.core.internal.java.jspel.JSPELParserConstants; |
| 34 | import org.eclipse.jst.jsp.core.internal.java.jspel.JSPELParserVisitor; |
| 35 | import org.eclipse.jst.jsp.core.internal.java.jspel.ParseException; |
| 36 | import org.eclipse.jst.jsp.core.internal.java.jspel.SimpleNode; |
| 37 | import org.eclipse.jst.jsp.core.internal.java.jspel.Token; |
itrimble | ef2843e | 2011-04-13 22:21:31 +0000 | [diff] [blame] | 38 | import org.eclipse.jst.jsp.core.internal.java.jspel.TokenMgrError; |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 39 | |
| 40 | /** |
| 41 | * Consumes an EL expression and converts into a completion prefix |
| 42 | * |
| 43 | * @author cbateman |
| 44 | * |
| 45 | */ |
| 46 | public final class ContentAssistParser |
| 47 | { |
| 48 | /** |
| 49 | * @param relativePosition -- 1-based position in elText (first position is 1) |
| 50 | * @param elText |
| 51 | * @return a content assist strategy for the given position and el expression |
| 52 | * or null if one cannot be determined |
| 53 | */ |
| 54 | public static ContentAssistStrategy getPrefix(final int relativePosition, final String elText) |
| 55 | { |
| 56 | if (elText == null) |
| 57 | { |
| 58 | return null; |
| 59 | } |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 60 | else if ("".equals(elText.trim())) //$NON-NLS-1$ |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 61 | { |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 62 | return new IdCompletionStrategy("", ""); //$NON-NLS-1$//$NON-NLS-2$ |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 63 | } |
| 64 | |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 65 | PrefixVisitor visitor = getVisitorForPosition(relativePosition, elText); |
| 66 | return visitor != null? visitor.getPrefix() : null; |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * Get symbol and symbol region at given position in el string |
| 71 | * @param context - IStructuredDocumentContext |
| 72 | * @param relativePosition - position in el string |
| 73 | * @param elText - el string |
| 74 | * @return SymbolInfo. May be null. |
| 75 | */ |
| 76 | public static SymbolInfo getSymbolInfo(IStructuredDocumentContext context, final int relativePosition, final String elText) { |
| 77 | if (elText == null || "".equals(elText.trim())) //$NON-NLS-1$ |
| 78 | { |
| 79 | return null; |
| 80 | } |
| 81 | PrefixVisitor visitor = getVisitorForPosition(relativePosition, elText); |
| 82 | if (visitor != null) { |
| 83 | SymbolInfo symbolInfo = visitor.getSymbolInfo(context); |
| 84 | if (symbolInfo != null) { |
| 85 | Region r = symbolInfo.getRelativeRegion(); |
| 86 | if (relativePosition > r.getOffset() && relativePosition <= r.getOffset() + r.getLength()) { |
| 87 | return symbolInfo; |
| 88 | } |
| 89 | } |
| 90 | } |
| 91 | return null; |
| 92 | } |
| 93 | |
| 94 | private static PrefixVisitor getVisitorForPosition(final int relativePosition, |
| 95 | final String elText) { |
| 96 | final java.io.StringReader reader = new java.io.StringReader(elText); |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 97 | final JSPELParser parser = new JSPELParser(reader); |
| 98 | |
| 99 | try |
| 100 | { |
| 101 | final ASTExpression expr = parser.Expression(); |
| 102 | final PrefixVisitor visitor = new PrefixVisitor(relativePosition, elText); |
| 103 | expr.jjtAccept(visitor, null); |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 104 | return visitor; |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 105 | } |
| 106 | catch (ParseException pe) |
| 107 | { |
| 108 | // TODO: handle parser by using current and expected tokens |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 109 | return null; |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 110 | } |
itrimble | ef2843e | 2011-04-13 22:21:31 +0000 | [diff] [blame] | 111 | catch (TokenMgrError tme) |
| 112 | { |
| 113 | // TODO: handle parser by using current and expected tokens |
| 114 | return null; |
| 115 | } |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | private static String substring(String s, Region r) { |
| 119 | return s.substring(r.getOffset(), r.getOffset() + r.getLength()); |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | private static class PrefixVisitor implements JSPELParserVisitor |
| 123 | { |
| 124 | private final int _relativePos; |
| 125 | private final String _fullText; |
| 126 | |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 127 | private String _symbolPrefix; // = null; initialized as tree is visited |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 128 | private int _prefixType; |
| 129 | private boolean _prefixResolved; // = false; set to true when the prefix is resolved |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 130 | private int _symbolStartPos = 1; // first char has position 1 |
| 131 | private int _symbolEndPos = 0; |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 132 | |
| 133 | PrefixVisitor(final int relativePos, final String fullText) |
| 134 | { |
| 135 | _relativePos = relativePos; |
| 136 | _fullText = fullText; |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * @return the prefix if resolved or null if not resolved |
| 141 | */ |
| 142 | public ContentAssistStrategy getPrefix() |
| 143 | { |
| 144 | if (_prefixResolved) |
| 145 | { |
| 146 | switch(_prefixType) |
| 147 | { |
| 148 | case ContentAssistStrategy.PREFIX_TYPE_DOT_COMPLETION: |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 149 | return new FunctionCompletionStrategy(_symbolPrefix, getProposalStart()); |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 150 | |
| 151 | case ContentAssistStrategy.PREFIX_TYPE_ID_COMPLETION: |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 152 | return new IdCompletionStrategy(_symbolPrefix, getProposalStart()); |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 153 | |
| 154 | case ContentAssistStrategy.PREFIX_TYPE_EMPTY_EXPRESSION: |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 155 | return new IdCompletionStrategy("", getProposalStart()); //$NON-NLS-1$ |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 156 | |
| 157 | default: |
| 158 | // do nothing; fall-through to return null |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | return null; |
| 163 | } |
| 164 | |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 165 | /** |
| 166 | * @param context - IStructuredDocumentContext |
| 167 | * @return symbol and symbol region if resolved, null otherwise |
| 168 | */ |
| 169 | public SymbolInfo getSymbolInfo(IStructuredDocumentContext context) { |
| 170 | if (_prefixResolved && _symbolStartPos < _symbolEndPos) { |
| 171 | Region region = new Region(_symbolStartPos - 1, _symbolEndPos - _symbolStartPos + 1); |
| 172 | ISymbol symbol = null; |
| 173 | switch (_prefixType) { |
| 174 | case ContentAssistStrategy.PREFIX_TYPE_ID_COMPLETION: |
| 175 | symbol = SymbolResolveUtil.getSymbolForVariable(context, substring(_fullText, region)); |
| 176 | break; |
| 177 | case ContentAssistStrategy.PREFIX_TYPE_DOT_COMPLETION: |
| 178 | symbol = SymbolResolveUtil.getSymbolForVariableSuffixExpr(context, _symbolPrefix + "." + substring(_fullText, region), _symbolEndPos == _fullText.length()); //$NON-NLS-1$ |
| 179 | break; |
| 180 | } |
| 181 | if (symbol != null) { |
| 182 | return new SymbolInfo(symbol, region); |
| 183 | } |
| 184 | } |
| 185 | return null; |
| 186 | } |
| 187 | |
| 188 | private String getProposalStart() { |
| 189 | if (_symbolStartPos <= _relativePos) { |
| 190 | return _fullText.substring(_symbolStartPos - 1, _relativePos - 1); |
| 191 | } |
| 192 | return ""; //$NON-NLS-1$ |
| 193 | } |
| 194 | |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 195 | public Object visit(ASTAddExpression node, Object data) |
| 196 | { |
| 197 | return node.childrenAccept(this, data); |
| 198 | } |
| 199 | |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 200 | public Object visit(ASTAndExpression node, Object data) |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 201 | { |
| 202 | return node.childrenAccept(this, data); |
| 203 | } |
| 204 | |
| 205 | public Object visit(ASTChoiceExpression node, Object data) |
| 206 | { |
| 207 | return node.childrenAccept(this, data); |
| 208 | } |
| 209 | |
| 210 | public Object visit(ASTEqualityExpression node, Object data) |
| 211 | { |
| 212 | return node.childrenAccept(this, data); |
| 213 | } |
| 214 | |
| 215 | public Object visit(ASTExpression node, Object data) |
| 216 | { |
| 217 | return node.childrenAccept(this, data); |
| 218 | } |
| 219 | |
| 220 | public Object visit(ASTFunctionInvocation node, Object data) |
| 221 | { |
| 222 | return node.childrenAccept(this, data); |
| 223 | } |
| 224 | |
| 225 | public Object visit(ASTLiteral node, Object data) |
| 226 | { |
| 227 | return node.childrenAccept(this, data); |
| 228 | } |
| 229 | |
| 230 | public Object visit(ASTMultiplyExpression node, Object data) |
| 231 | { |
| 232 | return node.childrenAccept(this, data); |
| 233 | } |
| 234 | |
| 235 | public Object visit(ASTOrExpression node, Object data) |
| 236 | { |
| 237 | return node.childrenAccept(this, data); |
| 238 | } |
| 239 | |
| 240 | public Object visit(ASTRelationalExpression node, Object data) |
| 241 | { |
| 242 | return node.childrenAccept(this, data); |
| 243 | } |
| 244 | |
| 245 | public Object visit(ASTUnaryExpression node, Object data) |
| 246 | { |
| 247 | return node.childrenAccept(this, data); |
| 248 | } |
| 249 | |
| 250 | public Object visit(ASTValue node, Object data) |
| 251 | { |
| 252 | // we're only in this value expr if it contains the cursor |
| 253 | if (testContainsCursor(node)) |
| 254 | { |
| 255 | return node.childrenAccept(this, data); |
| 256 | } |
| 257 | |
| 258 | return null; |
| 259 | } |
| 260 | |
| 261 | public Object visit(ASTValuePrefix node, Object data) |
| 262 | { |
| 263 | // for now, only concern ourselves with simple (identifier) prefixes |
| 264 | if (!_prefixResolved |
| 265 | && node.jjtGetNumChildren() == 0 |
| 266 | && node.getFirstToken().kind == JSPELParserConstants.IDENTIFIER) |
| 267 | { |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 268 | _symbolPrefix = node.getFirstToken().image; |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 269 | |
| 270 | if (testContainsCursor(node)) |
| 271 | { |
| 272 | // if the cursor is on this id, we don't need to visit |
| 273 | // further since we know both the prefix -- the id -- and |
| 274 | // the type -- it's an id completion |
| 275 | _prefixType = ContentAssistStrategy.PREFIX_TYPE_ID_COMPLETION; |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 276 | _symbolStartPos = node.getFirstToken().beginColumn; |
| 277 | _symbolEndPos = node.getFirstToken().endColumn; |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 278 | _prefixResolved = true; |
| 279 | } |
| 280 | } |
| 281 | return node.childrenAccept(this, data); |
| 282 | } |
| 283 | |
| 284 | public Object visit(ASTValueSuffix node, Object data) |
| 285 | { |
| 286 | // for now, only deal with the simple .id suffix |
| 287 | Token lastToken = node.getLastToken(); |
| 288 | if (node.jjtGetNumChildren() == 0) |
| 289 | { |
| 290 | if (!_prefixResolved |
| 291 | && node.getFirstToken().kind == JSPELParserConstants.DOT) |
| 292 | { |
| 293 | if (lastToken.kind == JSPELParserConstants.IDENTIFIER) |
| 294 | { |
| 295 | if (testContainsCursor(node)) |
| 296 | { |
| 297 | _prefixType = ContentAssistStrategy.PREFIX_TYPE_DOT_COMPLETION; |
| 298 | int proposalStartLength = _relativePos - lastToken.beginColumn; |
| 299 | if (proposalStartLength < 0) { // Cursor after firstToken start but before lastToken start? |
| 300 | proposalStartLength = 0; |
| 301 | } |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 302 | _symbolStartPos = lastToken.beginColumn; |
| 303 | _symbolEndPos = lastToken.endColumn; |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 304 | _prefixResolved = true; |
| 305 | } |
| 306 | // only include this suffix on the path if the cursor is |
| 307 | // further to the right. Thus for x.^y we get a prefix "x" |
| 308 | // and for x.y.^z we get "x.y" since this the part we must |
| 309 | // resolve the prefix for |
| 310 | else |
| 311 | { |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 312 | _symbolPrefix += node.getFirstToken().image + lastToken.image; |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 313 | } |
| 314 | } |
| 315 | else if (lastToken == node.getFirstToken()) |
| 316 | { |
| 317 | if (testCursorImmediatelyAfter(node)) |
| 318 | { |
| 319 | _prefixType = ContentAssistStrategy.PREFIX_TYPE_DOT_COMPLETION; |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 320 | _symbolStartPos = lastToken.endColumn + 1; |
| 321 | _symbolEndPos = lastToken.endColumn; |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 322 | _prefixResolved = true; |
| 323 | } |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | return null; |
| 328 | } |
| 329 | |
| 330 | if (node.getFirstToken().kind == JSPELParserConstants.LBRACKET) |
| 331 | { |
| 332 | // try to support ca inside the brackets |
| 333 | node.childrenAccept(this, data); |
| 334 | } |
| 335 | |
| 336 | Object retValue = node.childrenAccept(this, data); |
| 337 | |
| 338 | if (!_prefixResolved) |
| 339 | { |
| 340 | // if we haven't resolved the prefix yet, then we need |
| 341 | // to append this suffix value |
cbateman | 6b737e8 | 2007-12-13 00:38:26 +0000 | [diff] [blame] | 342 | _symbolPrefix += _fullText.substring(node.getFirstToken().beginColumn-1, node.getLastToken().endColumn); |
cbateman | 6d3359f | 2006-11-28 20:23:25 +0000 | [diff] [blame] | 343 | } |
| 344 | |
| 345 | return retValue; |
| 346 | } |
| 347 | |
| 348 | public Object visit(SimpleNode node, Object data) |
| 349 | { |
| 350 | return node.childrenAccept(this, data); |
| 351 | } |
| 352 | |
| 353 | private boolean testCursorImmediatelyAfter(SimpleNode node) |
| 354 | { |
| 355 | return node.getLastToken().endColumn == _relativePos-1; |
| 356 | } |
| 357 | |
| 358 | /** |
| 359 | * "Containing a cursor" here is deemed to mean that current cursor |
| 360 | * position as indicated by _relativePos, is either directly before, on or |
| 361 | * directly after an expression. For example, in a Value expression like |
| 362 | * |
| 363 | * x x x . y y y . z z z |
| 364 | * ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ |
| 365 | * 1 2 3 4 5 6 7 8 9 0 1 2 |
| 366 | * |
| 367 | * Position's 1-4 are on xxx, 5-8 are on yyy and 9-12 are on zzz |
| 368 | * |
| 369 | * @param node |
| 370 | * @return true if the node "contains the cursor" (see above) |
| 371 | */ |
| 372 | private boolean testContainsCursor(SimpleNode node) |
| 373 | { |
| 374 | return (node.getFirstToken().beginColumn <= _relativePos |
| 375 | && node.getLastToken().endColumn+1 >= _relativePos); |
| 376 | |
| 377 | } |
| 378 | } |
| 379 | |
| 380 | private ContentAssistParser() |
| 381 | { |
| 382 | // utility class; not instantiable |
| 383 | } |
| 384 | } |