@Override
public int toRegex(
PatternAPI pattern,
Locale locale,
String flags,
int width,
int precision,
String formatString,
int position) {
ensureValidFlags(flags, getValidFlags());
Justification j = getJustification(flags, width);
char padding = j == Justification.None ? 0 : getPaddingChar(flags);
if (j != Justification.None && matchExactWidth(flags, width)) {
return toExactWidthRegex(
pattern, locale, flags, j, padding, width, precision, formatString, position);
}
switch (j) {
case Center:
case Right:
appendPadding(pattern, padding);
}
pattern.addedCapturingGroup();
pattern.append('(');
int result = toRegex(pattern, locale, flags, padding, precision, formatString, position);
pattern.append(')');
switch (j) {
case Left:
case Center:
appendPadding(pattern, padding);
}
return result;
}
protected int toExactWidthRegex(
PatternAPI pattern,
Locale locale,
String flags,
Justification j,
char padding,
int width,
int precision,
String formatString,
int position) {
WidthMatchSubpatterns sub =
createSubpatterns(pattern, locale, flags, j, padding, width, precision);
sub.open();
sub.paddingWidth = -1;
int result =
appendExactWidthRegex(
sub, locale, flags, Justification.None, padding, -1, precision, formatString, position);
for (int w = 0; w <= width; w++) {
sub.paddingWidth = width - w;
int r =
appendExactWidthRegex(
sub, locale, flags, j, padding, w, precision, formatString, position);
if (r != IGNORE_SUBPATTERN) result = r;
}
sub.close();
pattern.putMemento(sub);
return result;
}
protected void appendPadding(final PatternAPI pattern, final char padding, int w) {
if (w <= 0) return;
pattern.append("[");
if (padding == ']') pattern.append('\\');
pattern.append(padding);
pattern.append("]{");
pattern.append(String.valueOf(w));
pattern.append("}");
}
protected void appendPadding(final PatternAPI pattern, final char padding) {
pattern.append("[");
if (padding == ']') pattern.append('\\');
pattern.append(padding);
pattern.append("]*");
}