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/* -*- Mode: java; tab-width: 4; indent-tabs-mode: 1; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1997-1999 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Igor Bukanov
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU Public License (the "GPL"), in which case the
* provisions of the GPL are applicable instead of those above.
* If you wish to allow use of your version of this file only
* under the terms of the GPL and not to allow others to use your
* version of this file under the NPL, indicate your decision by
* deleting the provisions above and replace them with the notice
* and other provisions required by the GPL. If you do not delete
* the provisions above, a recipient may use your version of this
* file under either the NPL or the GPL.
*/
package org.mozilla.javascript.tools.idswitch;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
public class FileBody {
private static class ReplaceItem {
ReplaceItem next;
int begin;
int end;
String replacement;
ReplaceItem(int begin, int end, String text) {
this.begin = begin;
this.end = end;
this.replacement = text;
}
}
private char[] buffer = new char[1 << 14]; // 16K
private int bufferEnd;
private int lineBegin;
private int lineEnd;
private int nextLineStart;
private int lineNumber;
ReplaceItem firstReplace;
ReplaceItem lastReplace;
public char[] getBuffer() { return buffer; }
public void readData(Reader r) throws IOException {
int capacity = buffer.length;
int offset = 0;
for (;;) {
int n_read = r.read(buffer, offset, capacity - offset);
if (n_read < 0) { break; }
offset += n_read;
if (capacity == offset) {
capacity *= 2;
char[] tmp = new char[capacity];
System.arraycopy(buffer, 0, tmp, 0, offset);
buffer = tmp;
}
}
bufferEnd = offset;
}
public void writeInitialData(Writer w) throws IOException {
w.write(buffer, 0, bufferEnd);
}
public void writeData(Writer w) throws IOException {
int offset = 0;
for (ReplaceItem x = firstReplace; x != null; x = x.next) {
int before_replace = x.begin - offset;
if (before_replace > 0) {
w.write(buffer, offset, before_replace);
}
w.write(x.replacement);
offset = x.end;
}
int tail = bufferEnd - offset;
if (tail != 0) {
w.write(buffer, offset, tail);
}
}
public boolean wasModified() { return firstReplace != null; }
public boolean setReplacement(int begin, int end, String text) {
if (equals(text, buffer, begin, end)) { return false; }
ReplaceItem item = new ReplaceItem(begin, end, text);
if (firstReplace == null) {
firstReplace = lastReplace = item;
}
else if (begin < firstReplace.begin) {
item.next = firstReplace;
firstReplace = item;
}
else {
ReplaceItem cursor = firstReplace;
ReplaceItem next = cursor.next;
while (next != null) {
if (begin < next.begin) {
item.next = next;
cursor.next = item;
break;
}
cursor = next;
next = next.next;
}
if (next == null) {
lastReplace.next = item;
}
}
return true;
}
public int getLineNumber() { return lineNumber; }
public int getLineBegin() { return lineBegin; }
public int getLineEnd() { return lineEnd; }
public void startLineLoop() {
lineNumber = 0;
lineBegin = lineEnd = nextLineStart = 0;
}
public boolean nextLine() {
if (nextLineStart == bufferEnd) {
lineNumber = 0; return false;
}
int i; int c = 0;
for (i = nextLineStart; i != bufferEnd; ++i) {
c = buffer[i];
if (c == '\n' || c == '\r') { break; }
}
lineBegin = nextLineStart;
lineEnd = i;
if (i == bufferEnd) {
nextLineStart = i;
}
else if (c == '\r' && i + 1 != bufferEnd && buffer[i + 1] == '\n') {
nextLineStart = i + 2;
}
else {
nextLineStart = i + 1;
}
++lineNumber;
return true;
}
private static boolean equals(String str, char[] array, int begin, int end)
{
if (str.length() == end - begin) {
for (int i = begin, j = 0; i != end; ++i, ++j) {
if (array[i] != str.charAt(j)) { return false; }
}
return true;
}
return false;
}
}
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