miscutilities.java

用java 编写的源码开放的文本编辑器。有很多有用的特性

		boolean backslash = false;
		boolean insideGroup = false;
		boolean insideNegativeLookahead = false;

		for(int i = 0; i < glob.length(); i++)
		{
			char c = glob.charAt(i);
			if(backslash)
			{
				buf.append('\\');
				buf.append(c);
				backslash = false;
				continue;
			}

			switch(c)
			{
			case '\\':
				backslash = true;
				break;
			case '?':
				buf.append('.');
				break;
			case '.':
				buf.append("\\.");
				break;
			case '*':
				buf.append(".*");
				break;
			case '{':
				buf.append('(');
				if(i + 1 != glob.length() && glob.charAt(i + 1) == '!')
				{
					buf.append('?');
					insideNegativeLookahead = true;
				}
				else
					insideGroup = true;
				break;
			case ',':
				if(insideGroup)
				{
					if(insideNegativeLookahead)
					{
						buf.append(").*");
						insideNegativeLookahead = false;
					}
					buf.append('|');
				}
				else
					buf.append(',');
				break;
			case '}':
				if(insideNegativeLookahead)
				{
					buf.append(").*");
					insideNegativeLookahead = false;
				}
				else if(insideGroup)
				{
					buf.append(')');
					insideGroup = false;
				}
				else
					buf.append('}');
				break;
			default:
				buf.append(c);
			}
		}

		return buf.toString();
	} //}}}

	//{{{ escapesToChars() method
	/**
	 * Converts "\n" and "\t" escapes in the specified string to
	 * newlines and tabs.
	 * @param str The string
	 * @since jEdit 2.3pre1
	 */
	public static String escapesToChars(String str)
	{
		StringBuffer buf = new StringBuffer();
		for(int i = 0; i < str.length(); i++)
		{
			char c = str.charAt(i);
			switch(c)
			{
			case '\\':
				if(i == str.length() - 1)
				{
					buf.append('\\');
					break;
				}
				c = str.charAt(++i);
				switch(c)
				{
				case 'n':
					buf.append('\n');
					break;
				case 't':
					buf.append('\t');
					break;
				default:
					buf.append(c);
					break;
				}
				break;
			default:
				buf.append(c);
			}
		}
		return buf.toString();
	} //}}}

	//{{{ charsToEscapes() method
	/**
	 * Escapes newlines, tabs, backslashes, and quotes in the specified
	 * string.
	 * @param str The string
	 * @since jEdit 2.3pre1
	 */
	public static String charsToEscapes(String str)
	{
		return charsToEscapes(str,"\n\t\\\"'");
	} //}}}

	//{{{ charsToEscapes() method
	/**
	 * Escapes the specified characters in the specified string.
	 * @param str The string
	 * @param extra Any characters that require escaping
	 * @since jEdit 4.1pre3
	 */
	public static String charsToEscapes(String str, String toEscape)
	{
		StringBuffer buf = new StringBuffer();
		for(int i = 0; i < str.length(); i++)
		{
			char c = str.charAt(i);
			if(toEscape.indexOf(c) != -1)
			{
				if(c == '\n')
					buf.append("\\n");
				else if(c == '\t')
					buf.append("\\t");
				else
				{
					buf.append('\\');
					buf.append(c);
				}
			}
			else
				buf.append(c);
		}
		return buf.toString();
	} //}}}

	//{{{ compareVersions() method
	/**
	 * @deprecated Call <code>compareStrings()</code> instead
	 */
	public static int compareVersions(String v1, String v2)
	{
		return compareStrings(v1,v2,false);
	} //}}}

	//{{{ compareStrings() method
	/**
	 * Compares two strings.<p>
	 *
	 * Unlike <function>String.compareTo()</function>,
	 * this method correctly recognizes and handles embedded numbers.
	 * For example, it places "My file 2" before "My file 10".<p>
	 *
	 * @param str1 The first string
	 * @param str2 The second string
	 * @param ignoreCase If true, case will be ignored
	 * @return negative If str1 &lt; str2, 0 if both are the same,
	 * positive if str1 &gt; str2
	 * @since jEdit 4.0pre1
	 */
	public static int compareStrings(String str1, String str2, boolean ignoreCase)
	{
		char[] char1 = str1.toCharArray();
		char[] char2 = str2.toCharArray();

		int len = Math.min(char1.length,char2.length);

		for(int i = 0, j = 0; i < len && j < len; i++, j++)
		{
			char ch1 = char1[i];
			char ch2 = char2[j];
			if(Character.isDigit(ch1) && Character.isDigit(ch2)
				&& ch1 != '0' && ch2 != '0')
			{
				int _i = i + 1;
				int _j = j + 1;

				for(; _i < char1.length; _i++)
				{
					if(!Character.isDigit(char1[_i]))
					{
						//_i--;
						break;
					}
				}

				for(; _j < char2.length; _j++)
				{
					if(!Character.isDigit(char2[_j]))
					{
						//_j--;
						break;
					}
				}

				int len1 = _i - i;
				int len2 = _j - j;
				if(len1 > len2)
					return 1;
				else if(len1 < len2)
					return -1;
				else
				{
					for(int k = 0; k < len1; k++)
					{
						ch1 = char1[i + k];
						ch2 = char2[j + k];
						if(ch1 != ch2)
							return ch1 - ch2;
					}
				}

				i = _i - 1;
				j = _j - 1;
			}
			else
			{
				if(ignoreCase)
				{
					ch1 = Character.toLowerCase(ch1);
					ch2 = Character.toLowerCase(ch2);
				}

				if(ch1 != ch2)
					return ch1 - ch2;
			}
		}

		return char1.length - char2.length;
	} //}}}

	//{{{ stringsEqual() method
	/**
	 * Returns if two strings are equal. This correctly handles null pointers,
	 * as opposed to calling <code>s1.equals(s2)</code>.
	 * @since jEdit 4.1pre5
	 */
	public static boolean stringsEqual(String s1, String s2)
	{
		if(s1 == null)
		{
			if(s2 == null)
				return true;
			else
				return false;
		}
		else if(s2 == null)
			return false;
		else
			return s1.equals(s2);
	} //}}}

	//}}}

	//{{{ Sorting methods

	//{{{ quicksort() method
	/**
	 * Sorts the specified array. Equivalent to calling
	 * <code>Arrays.sort()</code>.
	 * @param obj The array
	 * @param compare Compares the objects
	 * @since jEdit 4.0pre4
	 */
	public static void quicksort(Object[] obj, Comparator compare)
	{
		Arrays.sort(obj,compare);
	} //}}}

	//{{{ quicksort() method
	/**
	 * Sorts the specified vector.
	 * @param vector The vector
	 * @param compare Compares the objects
	 * @since jEdit 4.0pre4
	 */
	public static void quicksort(Vector vector, Comparator compare)
	{
		Collections.sort(vector,compare);
	} //}}}

	//{{{ quicksort() method
	/**
	 * Sorts the specified list.
	 * @param list The list
	 * @param compare Compares the objects
	 * @since jEdit 4.0pre4
	 */
	public static void quicksort(List list, Comparator compare)
	{
		Collections.sort(list,compare);
	} //}}}

	//{{{ quicksort() method
	/**
	 * Sorts the specified array. Equivalent to calling
	 * <code>Arrays.sort()</code>.
	 * @param obj The array
	 * @param compare Compares the objects
	 */
	public static void quicksort(Object[] obj, Compare compare)
	{
		Arrays.sort(obj,compare);
	} //}}}

	//{{{ quicksort() method
	/**
	 * Sorts the specified vector.
	 * @param vector The vector
	 * @param compare Compares the objects
	 */
	public static void quicksort(Vector vector, Compare compare)
	{
		Collections.sort(vector,compare);
	} //}}}

	//{{{ Compare interface
	/**
	 * An interface for comparing objects. This is a hold-over from
	 * they days when jEdit had its own sorting API due to JDK 1.1
	 * compatibility requirements. Use <code>java.util.Comparable</code>
	 * instead.
	 */
	public interface Compare extends Comparator
	{
		int compare(Object obj1, Object obj2);
	} //}}}

	//{{{ StringCompare class
	/**
	 * Compares strings.
	 */
	public static class StringCompare implements Compare
	{
		public int compare(Object obj1, Object obj2)
		{
			return compareStrings(obj1.toString(),
				obj2.toString(),false);
		}
	} //}}}

	//{{{ StringICaseCompare class
	/**
	 * Compares strings ignoring case.
	 */
	public static class StringICaseCompare implements Compare
	{
		public int compare(Object obj1, Object obj2)
		{
			return compareStrings(obj1.toString(),
				obj2.toString(),true);
		}
	} //}}}

	//{{{ MenuItemCompare class
	/**
	 * Compares menu item labels.
	 */
	public static class MenuItemCompare implements Compare
	{
		public int compare(Object obj1, Object obj2)
		{
			return compareStrings(((JMenuItem)obj1).getText(),
				((JMenuItem)obj2).getText(),true);
		}
	} //}}}

	//}}}

	//{{{ buildToVersion() method
	/**
	 * Converts an internal version number (build) into a
	 * `human-readable' form.
	 * @param build The build
	 */
	public static String buildToVersion(String build)
	{
		if(build.length() != 11)
			return "<unknown version: " + build + ">";
		// First 2 chars are the major version number
		int major = Integer.parseInt(build.substring(0,2));
		// Second 2 are the minor number
		int minor = Integer.parseInt(build.substring(3,5));
		// Then the pre-release status
		int beta = Integer.parseInt(build.substring(6,8));
		// Finally the bug fix release
		int bugfix = Integer.parseInt(build.substring(9,11));

		return "" + major + "." + minor
			+ (beta != 99 ? "pre" + beta :
			(bugfix != 0 ? "." + bugfix : "final"));
	} //}}}

	//{{{ isToolsJarAvailable() method
	/**
	 * If on JDK 1.2 or higher, make sure that tools.jar is available.
	 * This method should be called by plugins requiring the classes
	 * in this library.
	 * <p>
	 * tools.jar is searched for in the following places:
	 * <ol>
	 *   <li>the classpath that was used when jEdit was started,
	 *   <li>jEdit's jars folder in the user's home,
	 *   <li>jEdit's system jars folder,
	 *   <li><i>java.home</i>/lib/. In this case, tools.jar is added to
	 *       jEdit's list of known jars using jEdit.addPluginJAR(),
	 *       so that it gets loaded through JARClassLoader.
	 * </ol><p>
	 *
	 * On older JDK's this method does not perform any checks, and returns
	 * <code>true</code> (even though there is no tools.jar).
	 *
	 * @return <code>false</code> if and only if on JDK 1.2 and tools.jar
	 *    could not be found. In this case it prints some warnings on Log,
	 *    too, about the places where it was searched for.
	 * @since jEdit 3.2.2
	 */
	public static boolean isToolsJarAvailable()
	{
		Log.log(Log.DEBUG, MiscUtilities.class,"Searching for tools.jar...");

		Vector paths = new Vector();

		//{{{ 1. Check whether tools.jar is in the system classpath:
		paths.addElement("System classpath: "
			+ System.getProperty("java.class.path"));

		try
		{
			// Either class sun.tools.javac.Main or
			// com.sun.tools.javac.Main must be there:
			try
			{
				Class.forName("sun.tools.javac.Main");
			}
			catch(ClassNotFoundException e1)
			{
				Class.forName("com.sun.tools.javac.Main");
			}
			Log.log(Log.DEBUG, MiscUtilities.class,
				"- is in classpath. Fine.");
			return true;
		}
		catch(ClassNotFoundException e)
		{
			//Log.log(Log.DEBUG, MiscUtilities.class,
			//	"- is not in system classpath.");
		} //}}}

		//{{{ 2. Check whether it is in the jEdit user settings jars folder:
		String settingsDir = jEdit.getSettingsDirectory();
		if(settingsDir != null)
		{
			String toolsPath = constructPath(settingsDir, "jars",
				"tools.jar");
			paths.addElement(toolsPath);
			if(new File(toolsPath).exists())
			{
				Log.log(Log.DEBUG, MiscUtilities.class,
					"- is in the user's jars folder. Fine.");
				// jEdit will load it automatically
				return true;
			}
		} //}}}

		//{{{ 3. Check whether it is in jEdit's system jars folder:
		String jEditDir = jEdit.getJEditHome();
		if(jEditDir != null)
		{
			String toolsPath = constructPath(jEditDir, "jars", "tools.jar");
			paths.addElement(toolsPath);
			if(new File(toolsPath).exists())
			{
				Log.log(Log.DEBUG, MiscUtilities.class,
					"- is in jEdit's system jars folder. Fine.");
				// jEdit will load it automatically
				return true;
			}
		} //}}}

		//{{{ 4. Check whether it is in <java.home>/lib:
		String toolsPath = System.getProperty("java.home");
		if(toolsPath.toLowerCase().endsWith(File.separator + "jre"))
			toolsPath = toolsPath.substring(0, toolsPath.length() - 4);
		toolsPath = constructPath(toolsPath, "lib", "tools.jar");
		paths.addElement(toolsPath);

		if(!(new File(toolsPath).exists()))
		{
			Log.log(Log.WARNING, MiscUtilities.class,
				"Could not find tools.jar.\n"
				+ "I checked the following locations:\n"
				+ paths.toString());
			return false;
		} //}}}

		//{{{ Load it, if not yet done:
		EditPlugin.JAR jar = jEdit.getPluginJAR(toolsPath);
		if(jar == null)
		{
			Log.log(Log.DEBUG, MiscUtilities.class,
				"- adding " + toolsPath + " to jEdit plugins.");
			try
			{
				jEdit.addPluginJAR(new EditPlugin.JAR(toolsPath,
					new JARClassLoader(toolsPath)));
			}
			catch(IOException ioex)
			{
				Log.log(Log.ERROR, MiscUtilities.class,
					"- I/O error loading " + toolsPath);
				Log.log(Log.ERROR, MiscUtilities.class, ioex);
				return false;
			}
		}
		else
			Log.log(Log.DEBUG, MiscUtilities.class,
				"- has been loaded before.");
		//}}}

		return true;
	} //}}}

	//{{{ parsePermissions() method
	/**
	 * Parse a Unix-style permission string (rwxrwxrwx).
	 * @param str The string (must be 9 characters long).
	 * @since jEdit 4.1pre8
	 */
	public static int parsePermissions(String s)
	{
		int permissions = 0;

		if(s.length() == 9)
		{
			if(s.charAt(0) == 'r')
				permissions += 0400;
			if(s.charAt(1) == 'w')
				permissions += 0200;
			if(s.charAt(2) == 'x')
				permissions += 0100;
			else if(s.charAt(2) == 's')
				permissions += 04100;
			else if(s.charAt(2) == 'S')
				permissions += 04000;
			if(s.charAt(3) == 'r')
				permissions += 040;
			if(s.charAt(4) == 'w')
				permissions += 020;
			if(s.charAt(5) == 'x')
				permissions += 010;
			else if(s.charAt(5) == 's')
				permissions += 02010;
			else if(s.charAt(5) == 'S')
				permissions += 02000;
			if(s.charAt(6) == 'r')
				permissions += 04;
			if(s.charAt(7) == 'w')
				permissions += 02;
			if(s.charAt(8) == 'x')
				permissions += 01;
			else if(s.charAt(8) == 't')
				permissions += 01001;
			else if(s.charAt(8) == 'T')
				permissions += 01000;
		}

		return permissions;
	} //}}}

	//{{{ Private members
	private MiscUtilities() {}

	//{{{ resolveSymlinks() method
	private static String resolveSymlinks(String path)
	{
		try
		{
			return new File(path).getCanonicalPath();
		}
		catch(IOException io)
		{
			return path;
		}
	} //}}}

	//}}}
}