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/*******************************************************************************
* Copyright (c) 2005, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Rational Software - Initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.core.parser.scanner;
import java.io.File;
/**
* @author jcamelon
*
*/
public class ScannerUtility {
static final char DOT = '.';
static final char SLASH = '/';
static final char BSLASH = '\\';
static final char QUOTE = '\"';
/**
* This method is quick 1-pass path reconciler.
* Functions:
* - replace "/" or "\" by system's separator
* - replace multiple separators by single one
* - skip "/./"
* - skip quotes
* - process "/../" (skip previous directory level)
*
* @param originalPath - path to process
* @return - reconciled path
*/
public static String reconcilePath(String originalPath ) {
int len = originalPath.length();
int len1 = len - 1; // to avoid multiple calculations
int j = 0; // index for output array
boolean noSepBefore = true; // to avoid duplicate separators
char[] ein = new char[len];
char[] aus = new char[len + 1];
originalPath.getChars(0, len, ein, 0);
// allow double backslash at beginning for windows UNC paths, bug 233511
if(ein.length >= 2 && ein[0] == BSLASH && ein[1] == BSLASH &&
File.separatorChar == BSLASH) {
aus[j++] = BSLASH;
}
for (int i=0; i<len; i++) {
char c = ein[i];
switch (c) {
case QUOTE: // quotes are removed
noSepBefore = true;
break;
case SLASH: // both separators are processed
case BSLASH: // in the same way
if (noSepBefore) {
noSepBefore = false;
aus[j++] = File.separatorChar;
}
break;
case DOT:
// no separator before, not a 1st string symbol.
if (noSepBefore && j>0)
aus[j++] = c;
else { // separator before "." !
if (i < len1) {
c = ein[i+1]; // check for next symbol
// check for "/./" case
if (c == SLASH || c == BSLASH) {
// write nothing to output
// skip the next symbol
i++;
noSepBefore = false;
}
// symbol other than "." - write it also
else if (c != DOT) {
i++;
noSepBefore = true;
aus[j++] = DOT;
aus[j++] = c;
}
// we found "/.." sequence. Look ahead.
else {
// we found "/../" (or "/.." is at the end of string)
// we should delete previous segment of output path
if (i == len1 || ein[i+2] == SLASH || ein[i+2] == BSLASH) {
i+=2;
noSepBefore = false;
if (j > 1) { // there is at least 1 segment before
int k = j - 2;
while ( k >= 0 ) {
if (aus[k] == File.separatorChar) break;
k--;
}
j = k + 1; // set index to previous segment or to 0
}
}
// Case "/..blabla" processed as usual
else {
i++;
noSepBefore = true;
aus[j++] = DOT;
aus[j++] = DOT;
}
}
} else
{} // do nothing when "." is last symbol
}
break;
default:
noSepBefore = true;
aus[j++] = c;
}
}
return new String(aus, 0, j);
}
/**
* @param path - include path
* @param fileName - include file name
* @return - reconsiled path
*/
public static String createReconciledPath(String path, String fileName) {
boolean pathEmpty = (path == null || path.length() == 0);
return (pathEmpty ? fileName : reconcilePath(path + File.separatorChar + fileName));
}
}
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