100 lines
2.9 KiB
Java
100 lines
2.9 KiB
Java
package com.jdbernard.util;
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import java.io.OutputStream;
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import java.io.PrintWriter;
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public class WrappedPrinter {
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private PrintWriter printer;
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private int wrapWidth;
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private int lastPrintedLineLength = 0;
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public WrappedPrinter(OutputStream os, int wrapWidth,
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boolean autoflush) {
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this(new PrintWriter(os, autoflush), wrapWidth);
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}
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public WrappedPrinter(PrintWriter pw, int wrapWidth) {
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this.printer = pw;
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this.wrapWidth = wrapWidth;
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}
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public void print(String message) { print(message, ""); }
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public void print(String message, String offset) {
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int lastSpaceIdx = 0;
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int curLineLength = 0;
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int lineStartIdx = 0;
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int i = 0;
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int actualWidth = wrapWidth - offset.length();
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//message = message.replaceAll("[\n\r]", " ");
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// print initial offset if this is the beginning of the line
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if (lastPrintedLineLength == 0) {
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printer.print(offset);
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curLineLength = offset.length();
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}
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for (i = 0; i < message.length(); ++i) {
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curLineLength++;
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// see a tab, advance the line length by the appropriate amount
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if (message.charAt(i) == '\t') curLineLength += 7;
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// see a newline
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if (message.charAt(i) == '\n') {
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// mark it as the last seen whitespace
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lastSpaceIdx = i;
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// push the line length over the limit, forcing a return
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curLineLength += actualWidth;
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}
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// line has overflowed the prescribed width
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if (curLineLength > actualWidth) {
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// print up to the last space before the overflow
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printer.println(message.substring(lineStartIdx, lastSpaceIdx));
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// pick up the next line after said space
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lineStartIdx = lastSpaceIdx + 1;
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i = lastSpaceIdx;
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curLineLength = 0;
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// print initial offset if there is still more to print
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if (lineStartIdx < message.length()) {
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printer.print(offset);
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curLineLength = offset.length();
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}
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}
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// see whitespace, update last space index
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if (Character.isWhitespace(message.charAt(i))) lastSpaceIdx = i;
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}
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// any left over, it will fit on one line
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if (i - lineStartIdx > 0) {
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String lastLine = message.substring(lineStartIdx);
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printer.print(lastLine);
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curLineLength += lastLine.length();
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}
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// save back the new position
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lastPrintedLineLength = curLineLength;
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}
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public void println() { println("", ""); }
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public void println(String message) { println(message, ""); }
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public void println(String message, String offset) {
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print(message, offset);
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printer.println();
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lastPrintedLineLength = 0;
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}
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}
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