/*
******************************************************************
Copyright (c) 2007,2015-2016 Jeff Martin, Tim Bacon
All rights reserved.
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modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
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* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
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with the distribution.
* Neither the name of the XMLUnit nor the names
of its contributors may be used to endorse or promote products
derived from this software without specific prior written
permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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*/
package org.custommonkey.xmlunit;
import java.io.IOException;
import org.custommonkey.xmlunit.exceptions.XMLUnitRuntimeException;
import org.custommonkey.xmlunit.util.IntegerBuffer;
/**
* Contains some common code for DoctypeReader and DoctypeInputStream.
*
* <p>When used with DoctypeInputStream it assumes that the whole
* DOCTYPE declaration consists of US-ASCII characters.</p>
*/
final class DoctypeSupport {
interface Readable {
int read() throws IOException;
}
static final String DOCTYPE_OPEN_DECL = "<!";
static final String DOCTYPE_CLOSE_DECL = ">";
static final String DOCTYPE = "DOCTYPE ";
static final String SYSTEM = " SYSTEM \"";
private static final int[] DOCTYPE_INTS = {
'D', 'O', 'C', 'T', 'Y', 'P', 'E', ' '
};
private boolean hasSplit;
private final Readable original;
private Readable decl;
private Readable beforeDoctype;
private Readable afterDoctype;
/**
* Encapsulates a DOCTYPE declaration for the given name and system id.
*/
DoctypeSupport(String name, String systemId, Readable original,
boolean characters, String encoding) {
this.original = original;
StringBuilder sb = new StringBuilder(DOCTYPE_OPEN_DECL);
sb.append(DOCTYPE).append(name).append(SYSTEM)
.append(systemId).append('\"').append(DOCTYPE_CLOSE_DECL);
String s = sb.toString();
IntegerBuffer buf =
new IntegerBuffer(s.length() * (characters ? 1 : 2));
if (characters) {
char[] c = s.toCharArray();
for (int i = 0; i < c.length; i++) {
buf.append(c[i]);
}
} else {
try {
byte[] b = encoding == null
? s.getBytes() : s.getBytes(encoding);
for (int i = 0; i < b.length; i++) {
buf.append(b[i] & 0xFF);
}
} catch (java.io.UnsupportedEncodingException use) {
throw new XMLUnitRuntimeException("Unsupported encoding", use);
}
}
decl = new IntBufferReadable(buf);
}
/**
* Reads the next character from the declaration.
* @return -1 if the end of the declaration has been reached.
*/
int read() throws IOException {
int nextInt = -1;
if (!hasSplit) {
split();
}
if (beforeDoctype != null) {
nextInt = beforeDoctype.read();
if (nextInt == -1) {
beforeDoctype = null;
}
}
if (nextInt == -1 && decl != null) {
nextInt = decl.read();
if (nextInt == -1) {
decl = null;
}
}
if (nextInt == -1 && afterDoctype != null) {
nextInt = afterDoctype.read();
if (nextInt == -1) {
afterDoctype = null;
}
}
if (nextInt == -1) {
nextInt = original.read();
}
return nextInt;
}
/**
* Reads enough of the original Readable to know where to place
* the declaration. Fills beforeDecl and afterDecl from the data
* read ahead. Swallows the original DOCTYPE if there is one.
*/
private void split() throws IOException {
hasSplit = true;
IntegerBuffer before = new IntegerBuffer();
IntegerBuffer after = new IntegerBuffer();
int current;
boolean ready = false;
boolean stillNeedToSeeDoctype = true;
while (!ready && (current = original.read()) != -1) {
if (Character.isWhitespace((char) current)) {
before.append(current);
} else if (current == '<') {
// could be XML declaration, comment, PI, DOCTYPE
// or the first element
int[] elementOrDeclOr = readUntilCloseCharIsReached();
if (elementOrDeclOr.length > 0) {
if (elementOrDeclOr[0] == '?') {
// XML declaration or PI
before.append('<');
before.append(elementOrDeclOr);
} else if (elementOrDeclOr[0] != '!') {
// first element
after.append('<');
after.append(elementOrDeclOr);
stillNeedToSeeDoctype = false;
ready = true;
} else {
// comment or doctype
IntegerBuffer b =
new IntegerBuffer(elementOrDeclOr.length);
b.append(elementOrDeclOr);
if (b.indexOf(DOCTYPE_INTS) == -1) {
after.append('<');
after.append(elementOrDeclOr);
} else {
// swallow old declaration
stillNeedToSeeDoctype = false;
}
ready = true;
}
} else {
after.append('<');
stillNeedToSeeDoctype = false;
ready = true;
}
} else {
after.append(current);
stillNeedToSeeDoctype = false;
ready = true;
}
}
// need to eliminate original DOCTYPE if it exists
while (stillNeedToSeeDoctype && (current = original.read()) != -1) {
if (Character.isWhitespace((char) current)) {
after.append(current);
} else if (current == '<') {
int[] elementOrDeclOr = readUntilCloseCharIsReached();
if (elementOrDeclOr.length > 0) {
if (elementOrDeclOr[0] == '?') {
// PI
after.append('<');
after.append(elementOrDeclOr);
} else if (elementOrDeclOr[0] != '!') {
// first element
after.append('<');
after.append(elementOrDeclOr);
stillNeedToSeeDoctype = false;
} else {
// comment or doctype
IntegerBuffer b =
new IntegerBuffer(elementOrDeclOr.length);
b.append(elementOrDeclOr);
if (b.indexOf(DOCTYPE_INTS) == -1) {
after.append('<');
after.append(elementOrDeclOr);
} else {
// swallow old declaration
stillNeedToSeeDoctype = false;
}
}
} else {
after.append('<');
stillNeedToSeeDoctype = false;
}
} else {
after.append(current);
stillNeedToSeeDoctype = false;
}
}
beforeDoctype = before.size() > 0
? new IntBufferReadable(before) : null;
afterDoctype = after.size() > 0
? new IntBufferReadable(after) : null;
}
private int[] readUntilCloseCharIsReached() throws IOException {
IntegerBuffer i = new IntegerBuffer();
int intRead;
int openCount = 1;
while (openCount > 0 && (intRead = original.read()) != -1) {
i.append(intRead);
if (intRead == '<') {
openCount++;
}
if (intRead == '>') {
openCount--;
}
}
return i.toIntArray();
}
private static class IntBufferReadable implements Readable {
private final int[] buf;
private int off;
IntBufferReadable(IntegerBuffer b) {
buf = b.toIntArray();
}
public int read() {
return off >= buf.length ? -1 : buf[off++];
}
}
}