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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
\* */
// $Id$
package scalac.util;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;
public abstract class Strings {
//########################################################################
// Strings constants
final public static String[] EMPTY_ARRAY = new String[0];
//########################################################################
// Strings interface
/** The line separator */
public static String EOL = System.getProperty("line.separator", "\n");
/** Returns a string where all tabs have been replaced by white
* spaces to make the corresponding fields the same width.
*/
public static String format(List strings) {
List[] lines = new List[strings.size()];
List widths = new ArrayList();
int height = 0;
for (Iterator iterator = strings.iterator(); iterator.hasNext(); ) {
String string = (String)iterator.next();
List line = lines[height++] = new ArrayList();
for (int last = 0; last < string.length(); ) {
int next = string.indexOf('\t', last);
if (next < 0) next = string.length();
String substring = string.substring(last, next);
int index = line.size();
if (index == widths.size()) widths.add(new Integer(0));
int width = ((Integer)widths.get(index)).intValue();
widths.set(
index, new Integer(Math.max(width, substring.length())));
line.add(substring);
last = next + 1;
}
}
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < lines.length; i++) {
List line = lines[i];
for (int j = 0; true; j++) {
String string = (String)line.get(j);
buffer.append(string);
if (j == line.size() - 1) break;
int width = ((Integer)widths.get(j)).intValue();
for (int k = string.length(); k<width; k++) buffer.append(' ');
}
buffer.append(EOL);
}
return buffer.toString();
}
/** Returns the first char of the string or -1 if the string is empty. */
public static int firstChar(String string) {
return string.length() == 0 ? -1 : string.charAt(0);
}
/** Returns the last char of the string or -1 if the string is empty. */
public static int lastChar(String string) {
return string.length() == 0 ? -1 : string.charAt(string.length() - 1);
}
/** Returns a copy of the string, with leading whitespace omitted. */
public static String trimLeading(String string) {
for (int i = 0; i < string.length(); i++)
if (string.charAt(i) > ' ') return string.substring(i);
return "";
}
/** Returns a copy of the string, with trailing whitespace omitted. */
public static String trimTrailing(String string) {
for (int i = string.length() - 1; i >= 0; i--)
if (string.charAt(i) > ' ') return string.substring(0, i + 1);
return "";
}
/** Returns the stack trace of the exception */
public static String stackTrace(Throwable exception) {
StringWriter buffer = new StringWriter();
PrintWriter writer = new PrintWriter(buffer);
exception.printStackTrace(writer);
writer.close();
return buffer.toString();
}
//########################################################################
}
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