//psParser.java
//------------------------
//part of YaCy
//(C) by Michael Peter Christen; mc@yacy.net
//first published on http://www.anomic.de
//Frankfurt, Germany, 2007
//
//this file is contributed by Martin Thelian
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
//This program is free software; you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation; either version 2 of the License, or
//(at your option) any later version.
//
//This program is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//GNU General Public License for more details.
//
//You should have received a copy of the GNU General Public License
//along with this program; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package net.yacy.document.parser;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.InputStreamReader;
import net.yacy.document.AbstractParser;
import net.yacy.document.Document;
import net.yacy.document.Parser;
import net.yacy.kelondro.data.meta.DigestURI;
import net.yacy.kelondro.util.FileUtils;
public class psParser extends AbstractParser implements Parser {
private final static Object modeScan = new Object();
private static boolean modeScanDone = false;
private static String parserMode = "java";
public psParser() {
super("PostScript Document Parser");
this.SUPPORTED_EXTENSIONS.add("ps");
this.SUPPORTED_MIME_TYPES.add("application/postscript");
this.SUPPORTED_MIME_TYPES.add("application/ps");
this.SUPPORTED_MIME_TYPES.add("application/x-postscript");
this.SUPPORTED_MIME_TYPES.add("application/x-ps");
this.SUPPORTED_MIME_TYPES.add("application/x-postscript-not-eps");
if (!modeScanDone) synchronized (modeScan) {
if (testForPs2Ascii()) parserMode = "ps2ascii";
else parserMode = "java";
modeScanDone = true;
}
}
private boolean testForPs2Ascii() {
try {
String procOutputLine = null;
final StringBuilder procOutput = new StringBuilder(80);
final Process ps2asciiProc = Runtime.getRuntime().exec(new String[]{"ps2ascii", "--version"});
final BufferedReader stdOut = new BufferedReader(new InputStreamReader(ps2asciiProc.getInputStream()));
while ((procOutputLine = stdOut.readLine()) != null) {
procOutput.append(procOutputLine).append(", ");
}
stdOut.close();
final int returnCode = ps2asciiProc.waitFor();
return (returnCode == 0);
} catch (final Exception e) {
if (AbstractParser.log != null) AbstractParser.log.logInfo("ps2ascii not found. Switching to java parser mode.");
return false;
}
}
private Document[] parse(final DigestURI location, final String mimeType, @SuppressWarnings("unused") final String charset, final File sourceFile) throws Parser.Failure, InterruptedException {
File outputFile = null;
try {
// creating a temp file for the output
outputFile = FileUtils.createTempFile(this.getClass(), "ascii.txt");
// decide with parser mode to use
if (parserMode.equals("ps2ascii")) {
parseUsingPS2ascii(sourceFile,outputFile);
} else {
parseUsingJava(sourceFile,outputFile);
}
// return result
final Document[] docs = new Document[]{new Document(
location, // url
mimeType, // mime
"UTF-8", // charset
this,
null, // languages
null, // keywords
null, // title
"", // author
"", // publisher
null, // sections
null, // abstract
0.0f, 0.0f,
outputFile, // fulltext
null, // anchors
null, // rss
null, // images
false)}; // indexingdenied
return docs;
} catch (final Exception e) {
if (e instanceof InterruptedException) throw (InterruptedException) e;
if (e instanceof Parser.Failure) throw (Parser.Failure) e;
// delete temp file
if (outputFile != null) FileUtils.deletedelete(outputFile);
// throw exception
throw new Parser.Failure("Unexpected error while parsing ps file. " + e.getMessage(),location);
}
}
private static void parseUsingJava(final File inputFile, final File outputFile) throws Exception {
BufferedReader reader = null;
BufferedWriter writer = null;
try {
reader = new BufferedReader(new FileReader(inputFile));
writer = new BufferedWriter(new FileWriter(outputFile));
final String versionInfoLine = reader.readLine();
final String version = (versionInfoLine == null) ? "" : versionInfoLine.substring(versionInfoLine.length()-3);
int ichar = 0;
boolean isComment = false;
boolean isText = false;
if (version.length() > 0 && version.charAt(0) == '2') {
boolean isConnector = false;
while ((ichar = reader.read()) > 0) {
if (isConnector) {
if (ichar < 108) {
writer.write(' ');
}
isConnector = false;
} else if (ichar == '%') {
isComment = true;
} else if (ichar == '\n' && isComment) {
isComment = false;
} else if (ichar == ')' && isText ) {
isConnector = true;
isText = false;
} else if (isText) {
writer.write((char)ichar);
} else if (ichar == '(' && !isComment) {
isText = true;
}
}
} else if (version.length() > 0 && version.charAt(0) == '3') {
final StringBuilder stmt = new StringBuilder();
boolean isBMP = false;
boolean isStore = false;
int store = 0;
while ((ichar = reader.read()) > 0) {
if (ichar == '%') {
isComment = true;
} else if (ichar == '\n' && isComment){
isComment = false;
} else if (ichar == ')' && isText ) {
isText = false;
} else if (isText && !isBMP) {
writer.write((char)ichar);
} else if (ichar == '(' && !isComment && !isBMP) {
isText = true;
} else if (isStore) {
if (store == 9 || ichar == ' ' || ichar == 10) {
isStore = false;
store = 0;
if (stmt.toString().equals("BEGINBITM")) {
isText = false;
isBMP = true;
} else if (stmt.toString().equals("ENDBITMAP")) {
isBMP = false;
}
stmt.delete(0,stmt.length());
}
else {
stmt.append((char)ichar);
store++;
}
} else if (!isComment && !isStore && (ichar == 66 || ichar == 69)) {
isStore = true;
stmt.append((char)ichar);
store++;
}
}
} else {
throw new Exception("Unsupported Postscript version '" + version + "'.");
}
} finally {
if (reader != null) try { reader.close(); } catch (final Exception e) {/* */}
if (writer != null) try { writer.close(); } catch (final Exception e) {/* */}
}
}
/**
* This function requires the ghostscript-library
* @param inputFile
* @param outputFile
* @throws Exception
*/
private void parseUsingPS2ascii(final File inputFile, final File outputFile) throws Exception {
int execCode = 0;
StringBuilder procErr = null;
try {
String procOutputLine;
final StringBuilder procOut = new StringBuilder();
procErr = new StringBuilder();
final Process ps2asciiProc = Runtime.getRuntime().exec(new String[]{"ps2ascii", inputFile.getAbsolutePath(),outputFile.getAbsolutePath()});
final BufferedReader stdOut = new BufferedReader(new InputStreamReader(ps2asciiProc.getInputStream()));
final BufferedReader stdErr = new BufferedReader(new InputStreamReader(ps2asciiProc.getErrorStream()));
while ((procOutputLine = stdOut.readLine()) != null) {
procOut.append(procOutputLine);
}
stdOut.close();
while ((procOutputLine = stdErr.readLine()) != null) {
procErr.append(procOutputLine);
}
stdErr.close();
execCode = ps2asciiProc.waitFor();
} catch (final Exception e) {
final String errorMsg = "Unable to convert ps to ascii. " + e.getMessage();
AbstractParser.log.logSevere(errorMsg);
throw new Exception(errorMsg);
}
if (execCode != 0) throw new Exception("Unable to convert ps to ascii. ps2ascii returned statuscode " + execCode + "\n" + procErr.toString());
}
@Override
public Document[] parse(final DigestURI location, final String mimeType,
final String charset, final InputStream source)
throws Parser.Failure, InterruptedException {
File tempFile = null;
try {
// creating a tempfile
tempFile = FileUtils.createTempFile(this.getClass(), "temp.ps");
tempFile.deleteOnExit();
// copying inputstream into file
FileUtils.copy(source,tempFile);
// parsing the file
return parse(location,mimeType,charset,tempFile);
} catch (final Exception e) {
if (e instanceof InterruptedException) throw (InterruptedException) e;
if (e instanceof Parser.Failure) throw (Parser.Failure) e;
throw new Parser.Failure("Unable to parse the ps file. " + e.getMessage(), location);
} finally {
if (tempFile != null) FileUtils.deletedelete(tempFile);
}
}
}