/**
* Copyright (c) 2013 Puppet Labs, Inc. and other contributors, as listed below.
* 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:
* Puppet Labs
*/
package com.puppetlabs.geppetto.ruby.jrubyparser;
import java.io.File;
import java.io.IOException;
import org.jrubyparser.SourcePosition;
import org.jrubyparser.ast.Node;
import com.google.common.base.Charsets;
import com.google.common.io.Files;
/**
* Utils for JRubyparser
*
*/
public class JRubyparserUtils {
/**
* Finds position on line for a node.
* This is a very expensive operation as it needs to open the file, read it and scan!
*
* @param n
* @return
*/
public static int posOnLine(Node n) {
SourcePosition p = n.getPosition();
String s = rootContent(n);
if(s == null)
return -1;
for(int i = p.getStartOffset(); i > 0; i--)
if(s.charAt(i) == '\n')
return p.getStartOffset() - i - 1;
return p.getStartOffset(); // it was on the firstline.
}
/**
* Reads the root content of the Node's source file and returns it as a string.
* Returns null on failure to read the content.
*
* @param n
* @return
*/
public static String rootContent(Node n) {
SourcePosition p = n.getPosition();
File f = new File(p.getFile());
try {
return Files.toString(f, Charsets.UTF_8);
}
catch(IOException e) {
return null;
}
}
}