/*******************************************************************************
* Copyright (c) 2000, 2010 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.internal.corext.util;
import org.eclipse.osgi.util.TextProcessor;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.action.LegacyActionTools;
import org.eclipse.jface.viewers.StyledString;
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.core.IJavaProject;
import org.eclipse.jdt.core.formatter.IndentManipulation;
/**
* Helper class to provide String manipulation functions not available in standard JDK.
*/
public class Strings {
private Strings(){}
/**
* Tells whether we have to use the {@link TextProcessor}
* <p>
* This is used for performance optimization.
* </p>
* @since 3.4
*/
public static final boolean USE_TEXT_PROCESSOR;
static {
String testString= "args : String[]"; //$NON-NLS-1$
USE_TEXT_PROCESSOR= testString != TextProcessor.process(testString);
}
private static final String JAVA_ELEMENT_DELIMITERS= TextProcessor.getDefaultDelimiters() + "<>(),?{} "; //$NON-NLS-1$
/**
* Adds special marks so that that the given styled string is readable in a BiDi environment.
*
* @param styledString the styled string
* @return the processed styled string
* @since 3.4
*/
public static StyledString markLTR(StyledString styledString) {
/*
* NOTE: For performance reasons we do not call markLTR(styledString, null)
*/
if (!USE_TEXT_PROCESSOR)
return styledString;
String inputString= styledString.getString();
String string= TextProcessor.process(inputString);
if (string != inputString)
insertMarks(styledString, inputString, string);
return styledString;
}
/**
* Adds special marks so that that the given styled Java element label is readable in a BiDi
* environment.
*
* @param styledString the styled string
* @return the processed styled string
* @since 3.6
*/
public static StyledString markJavaElementLabelLTR(StyledString styledString) {
if (!USE_TEXT_PROCESSOR)
return styledString;
String inputString= styledString.getString();
String string= TextProcessor.process(inputString, JAVA_ELEMENT_DELIMITERS);
if (string != inputString)
insertMarks(styledString, inputString, string);
return styledString;
}
/**
* Adds special marks so that that the given styled string is readable in a BiDi environment.
*
* @param styledString the styled string
* @param delimiters the additional delimiters
* @return the processed styled string
* @since 3.4
*/
public static StyledString markLTR(StyledString styledString, String delimiters) {
if (!USE_TEXT_PROCESSOR)
return styledString;
String inputString= styledString.getString();
String string= TextProcessor.process(inputString, delimiters);
if (string != inputString)
insertMarks(styledString, inputString, string);
return styledString;
}
/**
* Inserts the marks into the given styled string.
*
* @param styledString the styled string
* @param originalString the original string
* @param processedString the processed string
* @since 3.5
*/
private static void insertMarks(StyledString styledString, String originalString, String processedString) {
int originalLength= originalString.length();
int processedStringLength= processedString.length();
char orig= originalLength > 0 ? originalString.charAt(0) : '\0';
for (int o= 0, p= 0; p < processedStringLength; p++) {
char processed= processedString.charAt(p);
if (o < originalLength) {
if (orig == processed) {
o++;
if (o < originalLength)
orig= originalString.charAt(o);
continue;
}
}
styledString.insert(processed, p);
}
}
/**
* Adds special marks so that that the given string is readable in a BiDi environment.
*
* @param string the string
* @return the processed styled string
* @since 3.4
*/
public static String markLTR(String string) {
if (!USE_TEXT_PROCESSOR)
return string;
return TextProcessor.process(string);
}
/**
* Adds special marks so that that the given string is readable in a BiDi environment.
*
* @param string the string
* @param delimiters the delimiters
* @return the processed styled string
* @since 3.4
*/
public static String markLTR(String string, String delimiters) {
if (!USE_TEXT_PROCESSOR)
return string;
return TextProcessor.process(string, delimiters);
}
/**
* Adds special marks so that that the given Java element label is readable in a BiDi
* environment.
*
* @param string the string
* @return the processed styled string
* @since 3.6
*/
public static String markJavaElementLabelLTR(String string) {
if (!USE_TEXT_PROCESSOR)
return string;
return TextProcessor.process(string, JAVA_ELEMENT_DELIMITERS);
}
/**
* Tests if a char is lower case. Fix for 26529.
* @param ch the char
* @return return true if char is lower case
*/
public static boolean isLowerCase(char ch) {
return Character.toLowerCase(ch) == ch;
}
public static boolean startsWithIgnoreCase(String text, String prefix) {
int textLength= text.length();
int prefixLength= prefix.length();
if (textLength < prefixLength)
return false;
for (int i= prefixLength - 1; i >= 0; i--) {
if (Character.toLowerCase(prefix.charAt(i)) != Character.toLowerCase(text.charAt(i)))
return false;
}
return true;
}
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.
*
* @param input the string
* @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.
*
* @param s the string to test
* @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.
* @param line the line
* @return the trimmed line
*/
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 (!IndentManipulation.isIndentChar(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 (IndentManipulation.isIndentChar(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 in indentation units. Odd spaces
* are not counted.
*
* @param line the text line
* @param project the java project from which to get the formatter
* preferences, or <code>null</code> for global preferences
* @return the number of indent units
* @since 3.1
*/
public static int computeIndentUnits(String line, IJavaProject project) {
return IndentManipulation.measureIndentUnits(line, CodeFormatterUtil.getTabWidth(project), CodeFormatterUtil.getIndentWidth(project));
}
/**
* Returns the indent of the given string in indentation units. Odd spaces
* are not counted.
*
* @param line the text line
* @param tabWidth the width of the '\t' character in space equivalents
* @param indentWidth the width of one indentation unit in space equivalents
* @return the indent of the given string in indentation units
*
* @since 3.1
*/
public static int computeIndentUnits(String line, int tabWidth, int indentWidth) {
return IndentManipulation.measureIndentUnits(line, tabWidth, indentWidth);
}
/**
* Computes the visual length of the indentation of a
* <code>CharSequence</code>, counting a tab character as the size until
* the next tab stop and every other whitespace character as one.
*
* @param line the string to measure the indent of
* @param tabSize the visual size of a tab in space equivalents
* @return the visual length of the indentation of <code>line</code>
* @since 3.1
*/
public static int measureIndentLength(CharSequence line, int tabSize) {
return IndentManipulation.measureIndentInSpaces(line, tabSize);
}
/**
* Removes the given number of indents from the line. Asserts that the given line
* has the requested number of indents. If <code>indentsToRemove <= 0</code>
* the line is returned.
* @param line the line
* @param indentsToRemove the indents to remove
*
* @param project the java project from which to get the formatter
* preferences, or <code>null</code> for global preferences
* @return the trimmed line
*
* @since 3.1
*/
public static String trimIndent(String line, int indentsToRemove, IJavaProject project) {
return IndentManipulation.trimIndent(line, indentsToRemove, CodeFormatterUtil.getTabWidth(project), CodeFormatterUtil.getIndentWidth(project));
}
/**
* Removes the given number of indents from the line. Asserts that the given line
* has the requested number of indents. If <code>indentsToRemove <= 0</code>
* the line is returned.
* @param line the line
* @param indentsToRemove the indents to remove
* @param tabWidth the tab width
* @param indentWidth the indent width
* @return the trimmed line
*
* @since 3.1
*/
public static String trimIndent(String line, int indentsToRemove, int tabWidth, int indentWidth) {
return IndentManipulation.trimIndent(line, indentsToRemove, tabWidth, indentWidth);
}
/**
* Removes the common number of indents from all lines. If a line
* only consists out of white space it is ignored.
* @param lines the lines
* @param project the java project from which to get the formatter
* preferences, or <code>null</code> for global preferences
* @since 3.1
*/
public static void trimIndentation(String[] lines, IJavaProject project) {
trimIndentation(lines, CodeFormatterUtil.getTabWidth(project), CodeFormatterUtil.getIndentWidth(project), true);
}
/**
* Removes the common number of indents from all lines. If a line
* only consists out of white space it is ignored.
* @param lines the lines
* @param tabWidth the size of one tab in space equivalents
* @param indentWidth the size of the indent in space equivalents
*
* @since 3.1
*/
public static void trimIndentation(String[] lines, int tabWidth, int indentWidth) {
trimIndentation(lines, tabWidth, indentWidth, true);
}
/**
* Removes the common number of indents from all lines. If a line
* only consists out of white space it is ignored. If <code>
* considerFirstLine</code> is false the first line will be ignored.
* @param lines the lines
*
* @param project the java project from which to get the formatter
* preferences, or <code>null</code> for global preferences
* @param considerFirstLine If <code>considerFirstLine</code> is false the first line will be ignored.
* @since 3.1
*/
public static void trimIndentation(String[] lines, IJavaProject project, boolean considerFirstLine) {
trimIndentation(lines, CodeFormatterUtil.getTabWidth(project), CodeFormatterUtil.getIndentWidth(project), considerFirstLine);
}
/**
* Removes the common number of indents from all lines. If a line
* only consists out of white space it is ignored. If <code>
* considerFirstLine</code> is false the first line will be ignored.
* @param lines the lines
* @param tabWidth the size of one tab in space equivalents
* @param indentWidth the size of the indent in space equivalents
* @param considerFirstLine If <code> considerFirstLine</code> is false the first line will be ignored.
* @since 3.1
*/
public static void trimIndentation(String[] lines, int tabWidth, int indentWidth, boolean considerFirstLine) {
String[] toDo= new String[lines.length];
// find indentation common to all lines
int minIndent= Integer.MAX_VALUE; // very large
for (int i= considerFirstLine ? 0 : 1; i < lines.length; i++) {
String line= lines[i];
if (containsOnlyWhitespaces(line))
continue;
toDo[i]= line;
int indent= computeIndentUnits(line, tabWidth, indentWidth);
if (indent < minIndent) {
minIndent= indent;
}
}
if (minIndent > 0) {
// remove this indent from all lines
for (int i= considerFirstLine ? 0 : 1; i < toDo.length; i++) {
String s= toDo[i];
if (s != null)
lines[i]= trimIndent(s, minIndent, tabWidth, indentWidth);
else {
String line= lines[i];
int indent= computeIndentUnits(line, tabWidth, indentWidth);
if (indent > minIndent)
lines[i]= trimIndent(line, minIndent, tabWidth, indentWidth);
else
lines[i]= trimLeadingTabsAndSpaces(line);
}
}
}
}
/**
* Returns that part of the indentation of <code>line</code> that makes up
* a multiple of indentation units.
*
* @param line the line to scan
* @param project the java project from which to get the formatter
* preferences, or <code>null</code> for global preferences
* @return the indent part of <code>line</code>, but no odd spaces
* @since 3.1
*/
public static String getIndentString(String line, IJavaProject project) {
return IndentManipulation.extractIndentString(line, CodeFormatterUtil.getTabWidth(project), CodeFormatterUtil.getIndentWidth(project));
}
/**
* Returns that part of the indentation of <code>line</code> that makes up
* a multiple of indentation units.
*
* @param line the line to scan
* @param tabWidth the size of one tab in space equivalents
* @param indentWidth the size of the indent in space equivalents
* @return the indent part of <code>line</code>, but no odd spaces
* @since 3.1
*/
public static String getIndentString(String line, int tabWidth, int indentWidth) {
return IndentManipulation.extractIndentString(line, tabWidth, indentWidth);
}
public static String[] removeTrailingEmptyLines(String[] sourceLines) {
int lastNonEmpty= findLastNonEmptyLineIndex(sourceLines);
String[] result= new String[lastNonEmpty + 1];
for (int i= 0; i < result.length; i++) {
result[i]= sourceLines[i];
}
return result;
}
private static int findLastNonEmptyLineIndex(String[] sourceLines) {
for (int i= sourceLines.length - 1; i >= 0; i--) {
if (! sourceLines[i].trim().equals(""))//$NON-NLS-1$
return i;
}
return -1;
}
/**
* Change the indent of, possible multi-line, code range. The current indent is removed, a new indent added.
* The first line of the code will not be changed. (It is considered to have no indent as it might start in
* the middle of a line)
* @param code the code
* @param codeIndentLevel level of indentation
*
* @param project the java project from which to get the formatter
* preferences, or <code>null</code> for global preferences
* @param newIndent new indent
* @param lineDelim line delimiter
* @return the changed code
* @since 3.1
*/
public static String changeIndent(String code, int codeIndentLevel, IJavaProject project, String newIndent, String lineDelim) {
return IndentManipulation.changeIndent(code, codeIndentLevel, CodeFormatterUtil.getTabWidth(project), CodeFormatterUtil.getIndentWidth(project), newIndent, lineDelim);
}
/**
* Change the indent of, possible muti-line, code range. The current indent is removed, a new indent added.
* The first line of the code will not be changed. (It is considered to have no indent as it might start in
* the middle of a line)
* @param code the code
* @param codeIndentLevel indent level
* @param tabWidth the size of one tab in space equivalents
* @param indentWidth the size of the indent in space equivalents
* @param newIndent new indent
* @param lineDelim line delimiter
* @return the changed code
* @since 3.1
*/
public static String changeIndent(String code, int codeIndentLevel, int tabWidth, int indentWidth, String newIndent, String lineDelim) {
return IndentManipulation.changeIndent(code, codeIndentLevel, tabWidth, indentWidth, newIndent, lineDelim);
}
public static String trimIndentation(String source, IJavaProject project, boolean considerFirstLine) {
return trimIndentation(source, CodeFormatterUtil.getTabWidth(project), CodeFormatterUtil.getIndentWidth(project), considerFirstLine);
}
public static String trimIndentation(String source, int tabWidth, int indentWidth, boolean considerFirstLine) {
try {
ILineTracker tracker= new DefaultLineTracker();
tracker.set(source);
int size= tracker.getNumberOfLines();
if (size == 1)
return source;
String lines[]= new String[size];
for (int i= 0; i < size; i++) {
IRegion region= tracker.getLineInformation(i);
int offset= region.getOffset();
lines[i]= source.substring(offset, offset + region.getLength());
}
Strings.trimIndentation(lines, tabWidth, indentWidth, considerFirstLine);
StringBuffer result= new StringBuffer();
int last= size - 1;
for (int i= 0; i < size; i++) {
result.append(lines[i]);
if (i < last)
result.append(tracker.getLineDelimiter(i));
}
return result.toString();
} catch (BadLocationException e) {
Assert.isTrue(false,"Can not happend"); //$NON-NLS-1$
return null;
}
}
/**
* Concatenate the given strings into one strings using the passed line delimiter as a
* delimiter. No delimiter is added to the last line.
* @param lines the lines
* @param delimiter line delimiter
* @return the concatenated lines
*/
public static String concatenate(String[] lines, String delimiter) {
StringBuffer buffer= new StringBuffer();
for (int i= 0; i < lines.length; i++) {
if (i > 0)
buffer.append(delimiter);
buffer.append(lines[i]);
}
return buffer.toString();
}
public static boolean equals(String s, char[] c) {
if (s.length() != c.length)
return false;
for (int i = c.length; --i >= 0;)
if (s.charAt(i) != c[i])
return false;
return true;
}
public static String removeTrailingCharacters(String text, char toRemove) {
int size= text.length();
int end= size;
for (int i= size - 1; i >= 0; i--) {
char c= text.charAt(i);
if (c == toRemove) {
end= i;
} else {
break;
}
}
if (end == size)
return text;
else if (end == 0)
return ""; //$NON-NLS-1$
else
return text.substring(0, end);
}
public static String removeMnemonicIndicator(String string) {
return LegacyActionTools.removeMnemonics(string);
}
}