--- /dev/null
+/*
+ * (c) Copyright IBM Corp. 2000, 2001.
+ * All Rights Reserved.
+ */
+package net.sourceforge.phpdt.internal.corext.util;
+
+import org.eclipse.jface.text.BadLocationException;
+import org.eclipse.jface.text.DefaultLineTracker;
+import org.eclipse.jface.text.ILineTracker;
+import org.eclipse.jface.text.IRegion;
+
+//import org.eclipse.jdt.internal.corext.Assert;
+
+/**
+ * Helper class to provide String manipulation functions not available in standard JDK.
+ */
+public class Strings {
+
+ public static String removeNewLine(String message) {
+ StringBuffer result= new StringBuffer();
+ int current= 0;
+ int index= message.indexOf('\n', 0);
+ while (index != -1) {
+ result.append(message.substring(current, index));
+ if (current < index && index != 0)
+ result.append(' ');
+ current= index + 1;
+ index= message.indexOf('\n', current);
+ }
+ result.append(message.substring(current));
+ return result.toString();
+ }
+
+ /**
+ * Converts the given string into an array of lines. The lines
+ * don't contain any line delimiter characters.
+ *
+ * @return the string converted into an array of strings. Returns <code>
+ * null</code> if the input string can't be converted in an array of lines.
+ */
+ public static String[] convertIntoLines(String input) {
+ try {
+ ILineTracker tracker= new DefaultLineTracker();
+ tracker.set(input);
+ int size= tracker.getNumberOfLines();
+ String result[]= new String[size];
+ for (int i= 0; i < size; i++) {
+ IRegion region= tracker.getLineInformation(i);
+ int offset= region.getOffset();
+ result[i]= input.substring(offset, offset + region.getLength());
+ }
+ return result;
+ } catch (BadLocationException e) {
+ return null;
+ }
+ }
+
+ /**
+ * Returns <code>true</code> if the given string only consists of
+ * white spaces according to Java. If the string is empty, <code>true
+ * </code> is returned.
+ *
+ * @return <code>true</code> if the string only consists of white
+ * spaces; otherwise <code>false</code> is returned
+ *
+ * @see java.lang.Character#isWhitespace(char)
+ */
+ public static boolean containsOnlyWhitespaces(String s) {
+ int size= s.length();
+ for (int i= 0; i < size; i++) {
+ if (!Character.isWhitespace(s.charAt(i)))
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * Removes leading tabs and spaces from the given string. If the string
+ * doesn't contain any leading tabs or spaces then the string itself is
+ * returned.
+ */
+ public static String trimLeadingTabsAndSpaces(String line) {
+ int size= line.length();
+ int start= size;
+ for (int i= 0; i < size; i++) {
+ char c= line.charAt(i);
+ if (c != '\t' && !Character.isSpaceChar(c)) {
+ start= i;
+ break;
+ }
+ }
+ if (start == 0)
+ return line;
+ else if (start == size)
+ return ""; //$NON-NLS-1$
+ else
+ return line.substring(start);
+ }
+
+ public static String trimTrailingTabsAndSpaces(String line) {
+ int size= line.length();
+ int end= size;
+ for (int i= size - 1; i >= 0; i--) {
+ char c= line.charAt(i);
+ if (c == '\t' || Character.isSpaceChar(c)) {
+ end= i;
+ } else {
+ break;
+ }
+ }
+ if (end == size)
+ return line;
+ else if (end == 0)
+ return ""; //$NON-NLS-1$
+ else
+ return line.substring(0, end);
+ }
+
+ /**
+ * Returns the indent of the given string.
+ *
+ * @param line the text line
+ * @param tabWidth the width of the '\t' character.
+ */
+ public static int computeIndent(String line, int tabWidth) {
+ int result= 0;
+ int blanks= 0;
+ int size= line.length();
+ for (int i= 0; i < size; i++) {
+ char c= line.charAt(i);
+ if (c == '\t') {
+ result++;
+ blanks= 0;
+ } else if (Character.isSpaceChar(c)) {
+ blanks++;
+ if (blanks == tabWidth) {
+ result++;
+ blanks= 0;
+ }
+ } else {
+ return result;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Removes the given number of idents from the line. Asserts that the given line
+ * has the requested number of indents. If <code>indentsToRemove <= 0</code>
+ * the line is returned.
+ */
+ public static String trimIndent(String line, int indentsToRemove, int tabWidth) {
+ if (line == null || indentsToRemove <= 0)
+ return line;
+
+ int start= 0;
+ int indents= 0;
+ int blanks= 0;
+ int size= line.length();
+ for (int i= 0; i < size; i++) {
+ char c= line.charAt(i);
+ if (c == '\t') {
+ indents++;
+ blanks= 0;
+ } else if (Character.isSpaceChar(c)) {
+ blanks++;
+ if (blanks == tabWidth) {
+ indents++;
+ blanks= 0;
+ }
+ } else {
+// Assert.isTrue(false, "Line does not have requested number of indents"); //$NON-NLS-1$
+ }
+ if (indents == indentsToRemove) {
+ start= i + 1;
+ break;
+ }
+ }
+ if (start == size)
+ return ""; //$NON-NLS-1$
+ else
+ return line.substring(start);
+ }
+
+ /**
+ * Removes all leading indents from the given line. If the line doesn't contain
+ * any indents the line itself is returned.
+ */
+ public static String trimIndents(String s, int tabWidth) {
+ int indent= computeIndent(s, tabWidth);
+ if (indent == 0)
+ return s;
+ return trimIndent(s, indent, tabWidth);
+ }
+
+ /**
+ * Removes the common number of indents from all lines. If a line
+ * only consists out of white space it is ignored.
+ */
+ public static void trimIndentation(String[] lines, int tabWidth) {
+ String[] toDo= new String[lines.length];
+ // find indentation common to all lines
+ int minIndent= Integer.MAX_VALUE; // very large
+ for (int i= 0; i < lines.length; i++) {
+ String line= lines[i];
+ if (containsOnlyWhitespaces(line))
+ continue;
+ toDo[i]= line;
+ int indent= computeIndent(line, tabWidth);
+ if (indent < minIndent) {
+ minIndent= indent;
+ }
+ }
+
+ if (minIndent > 0) {
+ // remove this indent from all lines
+ for (int i= 0; i < toDo.length; i++) {
+ String s= toDo[i];
+ if (s != null)
+ lines[i]= trimIndent(s, minIndent, tabWidth);
+ else {
+ String line= lines[i];
+ int indent= computeIndent(line, tabWidth);
+ if (indent > minIndent)
+ lines[i]= trimIndent(line, minIndent, tabWidth);
+ else
+ lines[i]= trimLeadingTabsAndSpaces(line);
+ }
+ }
+ }
+ }
+
+ public static String getIndentString(String line, int tabWidth) {
+ int size= line.length();
+ int end= 0;
+ int blanks= 0;
+ for (int i= 0; i < size; i++) {
+ char c= line.charAt(i);
+ if (c == '\t') {
+ end= i;
+ blanks= 0;
+ } else if (Character.isSpaceChar(c)) {
+ blanks++;
+ if (blanks == tabWidth) {
+ end= i;
+ blanks= 0;
+ }
+ } else {
+ break;
+ }
+ }
+ if (end == 0)
+ return ""; //$NON-NLS-1$
+ else if (end == size)
+ return line;
+ else
+ return line.substring(0, end + 1);
+ }
+}
+
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