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/*******************************************************************************
* Copyright (c) 2013, 2018 Red Hat.
*
* This program and the accompanying materials are made
* available under the terms of the Eclipse Public License 2.0
* which is available at https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Red Hat - Andrew Ferrazzutti
*******************************************************************************/
package org.eclipse.linuxtools.internal.systemtap.ui.ide;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
/**
* A helper class for removing comments from a SystemTap script.
* Note: if an entire line is a comment, it is replaced with a blank line.
*/
public final class CommentRemover {
private CommentRemover() {}
/**
* Remove comments from a .stp file in the filesystem.
* @param filename The filename of the script to remove comments from.
* @return The copy of the script with comments removed.
*/
public static String execWithFile(String filename) {
try (BufferedReader br = new BufferedReader(new FileReader(filename))) {
StringBuffer buffer = new StringBuffer();
String line;
while ((line = br.readLine()) != null) {
buffer.append(line.concat("\n")); //$NON-NLS-1$
}
// No need to format line breaks, since this did it already with newlines.
return exec(buffer.toString(), false);
} catch (IOException e) {
return ""; //$NON-NLS-1$
}
}
/**
* Remove comments from a .stp script. Also, line breaks will be formatted to newlines.
* @param contents A complete .stp script.
* @return A copy of the script with comments removed.
*/
public static String exec(String contents) {
return exec(contents, true);
}
private static String exec(String contents, boolean standardizeLineBreaks) {
if (contents == null || contents.isEmpty()) {
return ""; //$NON-NLS-1$
}
if (standardizeLineBreaks) {
contents = doStandardizeLineBreaks(contents);
}
char curchar, nxtchar;
boolean inQuotes = false;
boolean inComment = false;
int c = 0;
StringBuffer buffer = new StringBuffer();
do {
curchar = contents.charAt(c++);
nxtchar = c < contents.length() ? contents.charAt(c) : '\0';
// Comment tags don't count if they are in a string.
if (!inQuotes) {
if (!inComment) {
if (curchar == '#' || (curchar == '/' && nxtchar == '/')) {
buffer.append('\n'); // Replace the rest of this line with a newline.
c = contents.indexOf('\n', c); // Skip past the next newline, if one exists.
if (c == -1) {
break;
}
c++; // Skip the newline character on the next character scan.
continue;
}
if (curchar == '/' && nxtchar == '*') {
inComment = true;
c++; // Skip the * on the next character scan.
continue;
}
} else if (curchar == '*' && nxtchar == '/') {
inComment = false;
c++; // Skip the / on the next character scan.
continue;
}
}
// Quotes only count if they aren't commented out.
if (!inComment) {
if (curchar == '\"') {
inQuotes = !inQuotes;
}
else if (curchar == '\n' && inQuotes) {
inQuotes = false;
}
buffer.append(curchar);
}
else if (curchar == '\n') {
// Print the line breaks of multiline comments.
buffer.append(curchar);
}
} while (c < contents.length());
return buffer.toString();
}
private static String doStandardizeLineBreaks(String contents) {
return contents.replaceAll("(\\r\\n)|(\\n)", "\n"); //$NON-NLS-1$ //$NON-NLS-2$
}
}
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