Program: 151629
Project: 151629
Buggy source:
public static String promptExpressionParser(Shell shell,String input){
  StringBuilder builder=new StringBuilder();
  char[] expr=input.toCharArray();
  int i=0;
  int start=0;
  for (; i < expr.length; i++) {
switch (expr[i]) {
case '\\':
      if (i + 1 < expr.length) {
switch (expr[++i]) {
case '\\':
          builder.append(new String(expr,start,i - start - 1));
        builder.append("String_Node_Str");
      start=i + 1;
    break;
case 'w':
  builder.append(new String(expr,start,i - start - 1));
builder.append(shell.getProperty("String_Node_Str"));
start=i + 1;
break;
case 'W':
builder.append(new String(expr,start,i - start - 1));
String v=(String)shell.getProperty("String_Node_Str");
builder.append(v.substring(v.lastIndexOf('/') + 1));
start=i + 1;
break;
case 'd':
builder.append(new String(expr,start,i - start - 1));
builder.append(new SimpleDateFormat("String_Node_Str").format(new Date()));
start=i + 1;
break;
case 't':
builder.append(new String(expr,start,i - start - 1));
builder.append(new SimpleDateFormat("String_Node_Str").format(new Date()));
start=i + 1;
break;
case 'T':
builder.append(new String(expr,start,i - start - 1));
builder.append(new SimpleDateFormat("String_Node_Str").format(new Date()));
start=i + 1;
break;
case '@':
builder.append(new String(expr,start,i - start - 1));
builder.append(new SimpleDateFormat("String_Node_Str").format(new Date()));
start=i + 1;
break;
case '$':
builder.append(new String(expr,start,i - start - 1));
builder.append("String_Node_Str");
start=i + 1;
break;
case 'r':
builder.append(new String(expr,start,i - start - 1));
builder.append("String_Node_Str");
start=i + 1;
break;
case 'n':
builder.append(new String(expr,start,i - start - 1));
builder.append("String_Node_Str");
start=i + 1;
break;
case 'c':
if (i + 1 < expr.length) {
switch (expr[++i]) {
case '{':
builder.append(new String(expr,start,i - start - 2));
start=i;
while (i < input.length() && input.charAt(i) != '}') i++;
if (i == input.length() && input.charAt(i) != '}') {
builder.append(new String(expr,start,i - start));
}
 else {
String color=new String(expr,start + 1,i - start - 1);
start=++i;
Capture: while (i < expr.length) {
switch (expr[i]) {
case '\\':
if (i + 1 < expr.length) {
if (expr[i + 1] == 'c') {
break Capture;
}
}
default :
i++;
}
}
ShellColor c;
if ("String_Node_Str".equals(color)) {
c=ShellColor.RED;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.WHITE;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.BLUE;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.YELLOW;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.BOLD;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.BLACK;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.CYAN;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.GREEN;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.MAGENTA;
}
 else {
c=ShellColor.NONE;
}
String toColorize=promptExpressionParser(shell,new String(expr,start,i - start));
String cStr=shell.renderColor(c,toColorize);
builder.append(cStr);
start=i+=2;
}
break;
default :
builder.append(promptExpressionParser(shell,new String(expr,start,i - start - 2)));
start=++i;
}
}
}
}
}
}
if (start < expr.length && i > start) {
builder.append(new String(expr,start,i - start));
}
return builder.toString();
}

Fixed version (ground truth):
public static String promptExpressionParser(Shell shell,String input){
  StringBuilder builder=new StringBuilder();
  char[] expr=input.toCharArray();
  ShellColor c=null;
  int i=0;
  int start=0;
  for (; i < expr.length; i++) {
switch (expr[i]) {
case '\\':
      if (i + 1 < expr.length) {
switch (expr[++i]) {
case '\\':
          builder.append(new String(expr,start,i - start - 1));
        builder.append("String_Node_Str");
      start=i + 1;
    break;
case 'w':
  builder.append(new String(expr,start,i - start - 1));
builder.append(shell.getProperty("String_Node_Str"));
start=i + 1;
break;
case 'W':
builder.append(new String(expr,start,i - start - 1));
String v=(String)shell.getProperty("String_Node_Str");
builder.append(v.substring(v.lastIndexOf('/') + 1));
start=i + 1;
break;
case 'd':
builder.append(new String(expr,start,i - start - 1));
builder.append(new SimpleDateFormat("String_Node_Str").format(new Date()));
start=i + 1;
break;
case 't':
builder.append(new String(expr,start,i - start - 1));
builder.append(new SimpleDateFormat("String_Node_Str").format(new Date()));
start=i + 1;
break;
case 'T':
builder.append(new String(expr,start,i - start - 1));
builder.append(new SimpleDateFormat("String_Node_Str").format(new Date()));
start=i + 1;
break;
case '@':
builder.append(new String(expr,start,i - start - 1));
builder.append(new SimpleDateFormat("String_Node_Str").format(new Date()));
start=i + 1;
break;
case '$':
builder.append(new String(expr,start,i - start - 1));
builder.append("String_Node_Str");
start=i + 1;
break;
case 'r':
builder.append(new String(expr,start,i - start - 1));
builder.append("String_Node_Str");
start=i + 1;
break;
case 'n':
builder.append(new String(expr,start,i - start - 1));
builder.append("String_Node_Str");
start=i + 1;
break;
case 'c':
if (i + 1 < expr.length) {
switch (expr[++i]) {
case '{':
boolean nextNodeColor=false;
builder.append(new String(expr,start,i - start - 2));
start=i;
while (i < input.length() && input.charAt(i) != '}') i++;
if (i == input.length() && input.charAt(i) != '}') {
builder.append(new String(expr,start,i - start));
}
 else {
String color=new String(expr,start + 1,i - start - 1);
start=++i;
Capture: while (i < expr.length) {
switch (expr[i]) {
case '\\':
if (i + 1 < expr.length) {
if (expr[i + 1] == 'c') {
if ((i + 2 < expr.length) && expr[i + 2] == '{') {
nextNodeColor=true;
}
break Capture;
}
}
default :
i++;
}
}
if (c != null && c != ShellColor.NONE) {
builder.append(shell.renderColor(ShellColor.NONE,"String_Node_Str"));
}
if ("String_Node_Str".equals(color)) {
c=ShellColor.RED;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.WHITE;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.BLUE;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.YELLOW;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.BOLD;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.BLACK;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.CYAN;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.GREEN;
}
 else if ("String_Node_Str".equals(color)) {
c=ShellColor.MAGENTA;
}
 else {
c=ShellColor.NONE;
}
String toColorize=promptExpressionParser(shell,new String(expr,start,i - start));
String cStr=shell.renderColor(c,toColorize);
builder.append(cStr);
if (nextNodeColor) {
start=i--;
}
 else {
start=i+=2;
}
}
break;
default :
start=i+=2;
}
}
}
}
}
}
if (start < expr.length && i > start) {
builder.append(new String(expr,start,i - start));
}
return builder.toString();
}