net.sourceforge.phpeclipse.externaltools/src/net/sourceforge/phpdt/externaltools/model/ToolUtil.java

   1 package net.sourceforge.phpdt.externaltools.model;
   2
   3 /**********************************************************************
   4 Copyright (c) 2002 IBM Corp. and others. All rights reserved.
   5 This file is made available under the terms of the Common Public License v1.0
   6 which accompanies this distribution, and is available at
   7 http://www.eclipse.org/legal/cpl-v10.html
   8 �
   9 Contributors:
  10 **********************************************************************/
  11
  12 import java.util.ArrayList;
  13
  14 import net.sourceforge.phpdt.externaltools.internal.model.ExternalToolsModelMessages;
  15 import net.sourceforge.phpdt.externaltools.internal.registry.ArgumentVariable;
  16 import net.sourceforge.phpdt.externaltools.internal.registry.ArgumentVariableRegistry;
  17 import net.sourceforge.phpdt.externaltools.internal.registry.PathLocationVariable;
  18 import net.sourceforge.phpdt.externaltools.internal.registry.PathLocationVariableRegistry;
  19 import net.sourceforge.phpdt.externaltools.variable.ExpandVariableContext;
  20 import net.sourceforge.phpeclipse.externaltools.ExternalToolsPlugin;
  21
  22 import org.eclipse.core.runtime.IPath;
  23 import org.eclipse.core.runtime.MultiStatus;
  24
  25 /**
  26  * General utility class dealing with external tools
  27  */
  28 public final class ToolUtil {
  29         /**
  30          * Argument parsing constants
  31          */
  32         private static final char ARG_DELIMITER = ' '; //$NON-NLS-1$
  33         private static final char ARG_DBL_QUOTE = '"'; //$NON-NLS-1$
  34
  35         /**
  36          * Variable tag indentifiers
  37          */
  38         private static final char VAR_TAG_START_CHAR1 = '$'; //$NON-NLS-1$
  39         private static final char VAR_TAG_START_CHAR2 = '{'; //$NON-NLS-1$
  40         private static final char VAR_TAG_END_CHAR1 = '}'; //$NON-NLS-1$
  41         private static final String VAR_TAG_START = "${"; //$NON-NLS-1$
  42         private static final String VAR_TAG_END = "}"; //$NON-NLS-1$
  43         private static final String VAR_TAG_SEP = ":"; //$NON-NLS-1$
  44
  45         /**
  46          * No instances allowed
  47          */
  48         private ToolUtil() {
  49                 super();
  50         }
  51
  52         /**
  53          * Builds a variable tag that will be auto-expanded before
  54          * the tool is run.
  55          *
  56          * @param varName the name of a known variable (one of the VAR_* constants for instance)
  57          * @param varArgument an optional argument for the variable, <code>null</code> if none
  58          */
  59         public static String buildVariableTag(String varName, String varArgument) {
  60                 StringBuffer buf = new StringBuffer();
  61                 buildVariableTag(varName,varArgument, buf);
  62                 return buf.toString();
  63         }
  64
  65         /**
  66          * Builds a variable tag that will be auto-expanded before
  67          * the tool is run.
  68          *
  69          * @param varName the name of a known variable (one of the VAR_* constants for instance)
  70          * @param varArgument an optional argument for the variable, <code>null</code> if none
  71          * @param buffer the buffer to write the constructed variable tag
  72          */
  73         public static void buildVariableTag(String varName, String varArgument, StringBuffer buffer) {
  74                 buffer.append(VAR_TAG_START);
  75                 buffer.append(varName);
  76                 if (varArgument != null && varArgument.length() > 0) {
  77                         buffer.append(VAR_TAG_SEP);
  78                         buffer.append(varArgument);
  79                 }
  80                 buffer.append(VAR_TAG_END);
  81         }
  82
  83         /**
  84          * Expands all the variables found in an individual
  85          * argument text.
  86          *
  87          * @param argument one of the argument text in the list of arguments
  88          * @param context the context to use for expanding variables
  89          * @param status multi status to report any problems expanding variables
  90          * @return the argument text with all variables expanded, or <code>null</code> if not possible
  91          */
  92         public static String expandArgument(String argument, ExpandVariableContext context, MultiStatus status) {
  93                 StringBuffer buffer = new StringBuffer();
  94
  95                 int start = 0;
  96                 while (true) {
  97                         VariableDefinition varDef = extractVariableTag(argument, start);
  98
  99                         // No more variables found...
 100                         if (varDef.start == -1) {
 101                                 if (start == 0)
 102                                         buffer.append(argument);
 103                                 else
 104                                         buffer.append(argument.substring(start));
 105                                 break;
 106                         }
 107
 108                         // Invalid variable format
 109                         if (varDef.end == -1 || varDef.name == null || varDef.name.length() == 0) {
 110                                 String msg = ExternalToolsModelMessages.getString("ToolUtil.argumentVarFormatWrong"); //$NON-NLS-1$
 111                                 status.merge(ExternalToolsPlugin.newErrorStatus(msg, null));
 112                                 return null;
 113                         }
 114
 115                         // Copy text between start and variable.
 116                         if (varDef.start > start)
 117                                 buffer.append(argument.substring(start, varDef.start));
 118                         start = varDef.end;
 119
 120                         // Lookup the variable if it exist
 121                         ArgumentVariableRegistry registry;
 122                         registry = ExternalToolsPlugin.getDefault().getArgumentVariableRegistry();
 123                         ArgumentVariable variable = registry.getArgumentVariable(varDef.name);
 124                         if (variable == null) {
 125                                 String msg = ExternalToolsModelMessages.format("ToolUtil.argumentVarMissing", new Object[] {varDef.name}); //$NON-NLS-1$
 126                                 status.merge(ExternalToolsPlugin.newErrorStatus(msg, null));
 127                                 return null;
 128                         }
 129
 130                         // Expand the variable as text if possible
 131                         String text = variable.getExpander().getText(varDef.name, varDef.argument, context);
 132                         if (text == null) {
 133                                 String msg = ExternalToolsModelMessages.format("ToolUtil.argumentVarExpandFailed", new Object[] {varDef.name}); //$NON-NLS-1$
 134                                 status.merge(ExternalToolsPlugin.newErrorStatus(msg, null));
 135                                 return null;
 136                         }
 137                         buffer.append(text);
 138                 }
 139
 140                 return buffer.toString();
 141         }
 142
 143         /**
 144          * Returns a list of individual arguments where all
 145          * variables have been expanded.
 146          *
 147          * @param arguments the arguments with leading and trailing
 148          *              spaces already removed.
 149          * @param context the context used to expand the variable(s)
 150          * @param status multi status to report any problems expanding variables
 151          * @return the list of individual arguments where some elements in the
 152          *              list maybe <code>null</code> if problems expanding variable(s).
 153          */
 154         public static String[] expandArguments(String arguments, ExpandVariableContext context, MultiStatus status) {
 155                 if (arguments == null || arguments.length() == 0)
 156                         return new String[0];
 157
 158                 String[] argList = parseArgumentsIntoList(arguments);
 159                 for (int i = 0; i < argList.length; i++)
 160                         argList[i] = expandArgument(argList[i], context, status);
 161
 162                 return argList;
 163         }
 164
 165         /**
 166          * Returns the expanded directory location if represented by a
 167          * directory variable. Otherwise, the directory location given is
 168          * return unless an unknown variable was detected.
 169          *
 170          * @param dirLocation a directory location either as a path or a variable
 171          *              with leading and trailing spaces already removed.
 172          * @param context the context used to expand the variable
 173          * @param status multi status to report any problems expanding variables
 174          * @return the directory location as a string or <code>null</code> if not possible
 175          */
 176         public static String expandDirectoryLocation(String dirLocation, ExpandVariableContext context, MultiStatus status) {
 177                 if (dirLocation == null || dirLocation.length() == 0)
 178                         return ""; //$NON-NLS-1$
 179
 180                 VariableDefinition varDef = extractVariableTag(dirLocation, 0);
 181                 // Return if no variable found
 182                 if (varDef.start < 0)
 183                         return dirLocation;
 184
 185                 // Disallow text before/after variable
 186                 if (varDef.start != 0 || (varDef.end < dirLocation.length() && varDef.end != -1)) {
 187                         String msg = ExternalToolsModelMessages.getString("ToolUtil.dirLocVarBetweenText"); //$NON-NLS-1$
 188                         status.merge(ExternalToolsPlugin.newErrorStatus(msg, null));
 189                         return null;
 190                 }
 191
 192                 // Invalid variable format
 193                 if (varDef.name == null || varDef.name.length() == 0 || varDef.end == -1) {
 194                         String msg = ExternalToolsModelMessages.getString("ToolUtil.dirLocVarFormatWrong"); //$NON-NLS-1$
 195                         status.merge(ExternalToolsPlugin.newErrorStatus(msg, null));
 196                         return null;
 197                 }
 198
 199                 // Lookup the variable if it exist
 200                 PathLocationVariableRegistry registry;
 201                 registry = ExternalToolsPlugin.getDefault().getDirectoryLocationVariableRegistry();
 202                 PathLocationVariable variable = registry.getPathLocationVariable(varDef.name);
 203                 if (variable == null) {
 204                         String msg = ExternalToolsModelMessages.format("ToolUtil.dirLocVarMissing", new Object[] {varDef.name}); //$NON-NLS-1$
 205                         status.merge(ExternalToolsPlugin.newErrorStatus(msg, null));
 206                         return null;
 207                 }
 208
 209                 // Expand the variable into a IPath if possible
 210                 IPath path = variable.getExpander().getPath(varDef.name, varDef.argument, context);
 211                 if (path == null) {
 212                         String msg = ExternalToolsModelMessages.format("ToolUtil.dirLocVarExpandFailed", new Object[] {varDef.name}); //$NON-NLS-1$
 213                         status.merge(ExternalToolsPlugin.newErrorStatus(msg, null));
 214                         return null;
 215                 }
 216
 217                 return path.toOSString();
 218         }
 219
 220         /**
 221          * Returns the expanded file location if represented by a
 222          * file variable. Otherwise, the file location given is
 223          * return unless an unknown variable was detected.
 224          *
 225          * @param fileLocation a file location either as a path or a variable
 226          *              with leading and trailing spaces already removed.
 227          * @param context the context used to expand the variable
 228          * @param status multi status to report any problems expanding variables
 229          * @return the file location as a string or <code>null</code> if not possible
 230          */
 231         public static String expandFileLocation(String fileLocation, ExpandVariableContext context, MultiStatus status) {
 232                 if (fileLocation == null || fileLocation.length() == 0)
 233                         return ""; //$NON-NLS-1$
 234
 235                 VariableDefinition varDef = extractVariableTag(fileLocation, 0);
 236                 // Return if no variable found
 237                 if (varDef.start < 0)
 238                         return fileLocation;
 239
 240                 // Disallow text before/after variable
 241                 if (varDef.start != 0 || (varDef.end < fileLocation.length() && varDef.end != -1)) {
 242                         String msg = ExternalToolsModelMessages.getString("ToolUtil.fileLocVarBetweenText"); //$NON-NLS-1$
 243                         status.merge(ExternalToolsPlugin.newErrorStatus(msg, null));
 244                         return null;
 245                 }
 246
 247                 // Invalid variable format
 248                 if (varDef.name == null || varDef.name.length() == 0 || varDef.end == -1) {
 249                         String msg = ExternalToolsModelMessages.getString("ToolUtil.fileLocVarFormatWrong"); //$NON-NLS-1$
 250                         status.merge(ExternalToolsPlugin.newErrorStatus(msg, null));
 251                         return null;
 252                 }
 253
 254                 // Lookup the variable if it exist
 255                 PathLocationVariableRegistry registry;
 256                 registry = ExternalToolsPlugin.getDefault().getFileLocationVariableRegistry();
 257                 PathLocationVariable variable = registry.getPathLocationVariable(varDef.name);
 258                 if (variable == null) {
 259                         String msg = ExternalToolsModelMessages.format("ToolUtil.fileLocVarMissing", new Object[] {varDef.name}); //$NON-NLS-1$
 260                         status.merge(ExternalToolsPlugin.newErrorStatus(msg, null));
 261                         return null;
 262                 }
 263
 264                 // Expand the variable into a IPath if possible
 265                 IPath path = variable.getExpander().getPath(varDef.name, varDef.argument, context);
 266                 if (path == null) {
 267                         String msg = ExternalToolsModelMessages.format("The variable {0} with argument {1} could not be expanded to a valid path.", new Object[] {varDef.name, varDef.argument});
 268                         status.merge(ExternalToolsPlugin.newErrorStatus(msg, null));
 269                         return null;
 270                 }
 271
 272                 return path.toString();
 273         }
 274
 275         /**
 276          * Extracts from the source text the variable tag's name
 277          * and argument.
 278          *
 279          * @param text the source text to parse for a variable tag
 280          * @param start the index in the string to start the search
 281          * @return the variable definition
 282          */
 283         public static VariableDefinition extractVariableTag(String text, int start) {
 284                 VariableDefinition varDef = new VariableDefinition();
 285
 286                 varDef.start = text.indexOf(VAR_TAG_START, start);
 287                 if (varDef.start < 0)
 288                         return varDef;
 289                 start = varDef.start + VAR_TAG_START.length();
 290
 291                 int end = text.indexOf(VAR_TAG_END, start);
 292                 if (end < 0)
 293                         return varDef;
 294                 varDef.end = end + VAR_TAG_END.length();
 295                 if (end == start)
 296                         return varDef;
 297
 298                 int mid = text.indexOf(VAR_TAG_SEP, start);
 299                 if (mid < 0 || mid > end) {
 300                         varDef.name = text.substring(start, end);
 301                 } else {
 302                         if (mid > start)
 303                                 varDef.name = text.substring(start, mid);
 304                         mid = mid + VAR_TAG_SEP.length();
 305                         if (mid < end)
 306                                 varDef.argument = text.substring(mid, end);
 307                 }
 308
 309                 return varDef;
 310         }
 311
 312         /**
 313          * Parses the argument text into an array of individual
 314          * arguments using the space character as the delimiter.
 315          * An individual argument containing spaces must have a
 316          * double quote (") at the start and end. Two double
 317          * quotes together is taken to mean an embedded double
 318          * quote in the argument text. Variables are treated as
 319          * a single unit and therefore spaces and double quotes
 320          * inside a variable are copied as is and not parsed.
 321          *
 322          * @param arguments the arguments as one string
 323          * @return the array of arguments
 324          */
 325         public static String[] parseArgumentsIntoList(String arguments) {
 326                 if (arguments == null || arguments.length() == 0)
 327                         return new String[0];
 328
 329                 ArrayList list = new ArrayList(10);
 330                 boolean inQuotes = false;
 331                 boolean inVar = false;
 332                 int start = 0;
 333                 int end = arguments.length();
 334                 StringBuffer buffer = new StringBuffer(end);
 335
 336                 while (start < end) {
 337                         char ch = arguments.charAt(start);
 338                         start++;
 339
 340                         switch (ch) {
 341                                 case ARG_DELIMITER :
 342                                         if (inQuotes || inVar) {
 343                                                 buffer.append(ch);
 344                                         } else {
 345                                                 if (buffer.length() > 0) {
 346                                                         list.add(buffer.toString());
 347                                                         buffer.setLength(0);
 348                                                 }
 349                                         }
 350                                         break;
 351
 352                                 case ARG_DBL_QUOTE :
 353                                         if (inVar) {
 354                                                 buffer.append(ch);
 355                                         } else {
 356                                                 if (start < end) {
 357                                                         if (arguments.charAt(start) == ARG_DBL_QUOTE) {
 358                                                                 // Two quotes together represents one quote
 359                                                                 buffer.append(ch);
 360                                                                 start++;
 361                                                         } else {
 362                                                                 inQuotes = !inQuotes;
 363                                                         }
 364                                                 } else {
 365                                                         // A lone quote at the end, just drop it.
 366                                                         inQuotes = false;
 367                                                 }
 368                                         }
 369                                         break;
 370
 371                                 case VAR_TAG_START_CHAR1 :
 372                                         buffer.append(ch);
 373                                         if (!inVar && start < end) {
 374                                                 if (arguments.charAt(start) == VAR_TAG_START_CHAR2) {
 375                                                         buffer.append(VAR_TAG_START_CHAR2);
 376                                                         inVar = true;
 377                                                         start++;
 378                                                 }
 379                                         }
 380                                         break;
 381
 382                                 case VAR_TAG_END_CHAR1 :
 383                                         buffer.append(ch);
 384                                         inVar = false;
 385                                         break;
 386
 387                                 default :
 388                                         buffer.append(ch);
 389                                         break;
 390                         }
 391
 392                 }
 393
 394                 if (buffer.length() > 0)
 395                         list.add(buffer.toString());
 396
 397                 String[] results = new String[list.size()];
 398                 list.toArray(results);
 399                 return results;
 400         }
 401
 402
 403         /**
 404          * Structure to represent a variable definition within a
 405          * source string.
 406          */
 407         public static final class VariableDefinition {
 408                 /**
 409                  * Index in the source text where the variable started
 410                  * or <code>-1</code> if no valid variable start tag
 411                  * identifier found.
 412                  */
 413                 public int start = -1;
 414
 415                 /**
 416                  * Index in the source text of the character following
 417                  * the end of the variable or <code>-1</code> if no
 418                  * valid variable end tag found.
 419                  */
 420                 public int end = -1;
 421
 422                 /**
 423                  * The variable's name found in the source text, or
 424                  * <code>null</code> if no valid variable found.
 425                  */
 426                 public String name = null;
 427
 428                 /**
 429                  * The variable's argument found in the source text, or
 430                  * <code>null</code> if no valid variable found or if
 431                  * the variable did not specify an argument
 432                  */
 433                 public String argument = null;
 434
 435                 /**
 436                  * Create an initialized variable definition.
 437                  */
 438                 private VariableDefinition() {
 439                         super();
 440                 }
 441
 442                 /**
 443                  * Create an initialized variable definition.
 444                  */
 445                 private VariableDefinition(int start, int end) {
 446                         super();
 447                         this.start = start;
 448                         this.end = end;
 449                 }
 450         }
 451 }