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package com.thaiopensource.relaxng.output.dtd;
import java.util.NoSuchElementException;
class ModelBreaker {
private boolean done = false;
private BreakIterator iter;
private final String prefix;
private final String model;
private final String suffix;
private final int maxLineLength;
private int modelPos;
private ModelBreaker nested = null;
private static class BreakIterator {
private final String model;
private int pos = 0;
private final int length;
BreakIterator(String model) {
this.model = model;
this.length = model.length();
}
int getPos() {
return pos;
}
boolean advance() {
boolean advanced = false;
int level = 0;
for (; pos < length; pos++) {
switch (model.charAt(pos)) {
case '(':
level++;
break;
case ')':
level--;
break;
case ',':
if (level != 0)
break;
if (++pos != length)
return true;
break;
case '|':
if (level != 0 || !advanced)
break;
return true;
case ' ':
if (level != 0 || !advanced)
break;
return true;
}
advanced = true;
}
return false;
}
}
ModelBreaker(String prefix, String model, String suffix, int maxLineLength) {
if (isSingleGroup(model)) {
int open = model.indexOf('(') + 1;
this.prefix = prefix + model.substring(0, open);
this.model = model.substring(open);
}
else {
this.prefix = prefix;
this.model = model;
}
this.suffix = suffix;
this.maxLineLength = maxLineLength;
this.modelPos = 0;
}
boolean hasNextLine() {
if (nested != null && nested.hasNextLine())
return true;
return !done;
}
String nextLine() {
if (nested != null && nested.hasNextLine())
return nested.nextLine();
if (done)
throw new NoSuchElementException();
int avail = maxLineLength - prefix.length();
int breakPos;
boolean tooBig = false;
if ((model.length() - modelPos) + suffix.length() > avail) {
if (iter == null)
iter = new BreakIterator(model);
breakPos = -1;
do {
int pos = iter.getPos();
if (pos >= model.length())
break;
int w = pos - modelPos;
if (w > 0) {
if (w > avail) {
if (breakPos == -1) {
breakPos = pos;
tooBig = true;
}
break;
}
breakPos = pos;
}
} while (iter.advance());
if (breakPos == -1) {
tooBig = true;
breakPos = model.length();
}
}
else
breakPos = model.length();
int nextModelPos;
if (breakPos < model.length() && model.charAt(breakPos) == ' ')
nextModelPos = breakPos + 1;
else
nextModelPos = breakPos;
StringBuffer buf = new StringBuffer();
if (modelPos == 0)
buf.append(prefix);
else {
for (int i = 0, len = prefix.length(); i < len; i++)
buf.append(' ');
}
if (tooBig && (modelPos != 0 || breakPos != model.length())) {
String nestSuffix;
if (breakPos == model.length()) {
done = true;
nestSuffix = suffix;
}
else
nestSuffix = "";
nested = new ModelBreaker(buf.toString(), model.substring(modelPos, breakPos), nestSuffix, maxLineLength);
modelPos = nextModelPos;
return nested.nextLine();
}
buf.append(model.substring(modelPos, breakPos));
if (nextModelPos == model.length()) {
done = true;
buf.append(suffix);
}
modelPos = nextModelPos;
return buf.toString();
}
private static boolean isSingleGroup(String model) {
int length = model.length();
if (length == 0)
return false;
int i = 0;
if (model.charAt(0) == '|')
i++;
if (model.charAt(i) != '(')
return false;
loop:
while (length > i) {
switch (model.charAt(length - 1)) {
case '*': case '+': case '?': case ',': case '|': case ')':
length--;
break;
default:
break loop;
}
}
int level = 0;
for (++i; i < length; i++)
switch (model.charAt(i)) {
case '(':
level++;
break;
case ')':
if (level == 0)
return false;
level--;
break;
}
return true;
}
static public void main(String[] args) throws NumberFormatException {
for (ModelBreaker breaker = new ModelBreaker(args[0], args[1], args[2], Integer.parseInt(args[3]));
breaker.hasNextLine();)
System.err.println(breaker.nextLine());
}
}
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