DeTab.java

public class DeTab { Tabs ts; // iniitialized in Constructor public static void main(String[] argv) throws IOException { DeTab dt = new DeTab(8); dt.detab(new BufferedReader(new InputStreamReader(System.in)), new PrintWriter(System.out)); } /** detab one file (replace tabs with spaces) * @param is - the file to be processed * @param out - the updated file */ public void detab(BufferedReader is, PrintWriter out) throws IOException { String line; char c; int col; while ((line = is.readLine( )) != null) { out.println(detabLine(line)); } } /** detab one line (replace tabs with spaces) * @param line - the line to be processed * @return the updated line */ public String detabLine(String line) { char c; int col; StringBuffer sb = new StringBuffer( ); col = 0; for (int i = 0; i < line.length( ); i++) { // Either ordinary character or tab. if ((c = line.charAt(i)) != '\t') { sb.append(c); // Ordinary ++col; continue; } do { // Tab, expand it, must put >=1 space sb.append(' '); } while (!ts.isTabStop(++col)); } return sb.toString( ); } }