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308 lines
12 KiB
308 lines
12 KiB
//psParser.java
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//------------------------
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//part of YaCy
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//(C) by Michael Peter Christen; mc@anomic.de
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//first published on http://www.anomic.de
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//Frankfurt, Germany, 2007
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//
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//this file is contributed by Martin Thelian
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//last major change: 15.09.2005
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//
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//This program is free software; you can redistribute it and/or modify
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//it under the terms of the GNU General Public License as published by
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//the Free Software Foundation; either version 2 of the License, or
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//(at your option) any later version.
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//
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//This program is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//GNU General Public License for more details.
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//
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//You should have received a copy of the GNU General Public License
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//along with this program; if not, write to the Free Software
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//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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//Using this software in any meaning (reading, learning, copying, compiling,
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//running) means that you agree that the Author(s) is (are) not responsible
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//for cost, loss of data or any harm that may be caused directly or indirectly
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//by usage of this softare or this documentation. The usage of this software
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//is on your own risk. The installation and usage (starting/running) of this
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//software may allow other people or application to access your computer and
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//any attached devices and is highly dependent on the configuration of the
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//software which must be done by the user of the software; the author(s) is
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//(are) also not responsible for proper configuration and usage of the
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//software, even if provoked by documentation provided together with
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//the software.
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//
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//Any changes to this file according to the GPL as documented in the file
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//gpl.txt aside this file in the shipment you received can be done to the
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//lines that follows this copyright notice here, but changes must not be
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//done inside the copyright notive above. A re-distribution must contain
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//the intact and unchanged copyright notice.
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//Contributions and changes to the program code must be marked as such.
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package de.anomic.plasma.parser.ps;
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import java.io.BufferedReader;
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import java.io.BufferedWriter;
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import java.io.File;
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import java.io.FileReader;
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import java.io.FileWriter;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.util.Hashtable;
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import de.anomic.net.URL;
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import de.anomic.plasma.plasmaParserDocument;
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import de.anomic.plasma.parser.AbstractParser;
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import de.anomic.plasma.parser.Parser;
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import de.anomic.plasma.parser.ParserException;
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import de.anomic.server.serverFileUtils;
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public class psParser extends AbstractParser implements Parser {
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/**
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* a list of mime types that are supported by this parser class
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* @see #getSupportedMimeTypes()
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*/
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public static final Hashtable SUPPORTED_MIME_TYPES = new Hashtable();
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static {
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SUPPORTED_MIME_TYPES.put("application/postscript","ps");
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SUPPORTED_MIME_TYPES.put("text/postscript","ps");
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}
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/**
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* a list of library names that are needed by this parser
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* @see Parser#getLibxDependences()
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*/
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private static final String[] LIBX_DEPENDENCIES = new String[] {};
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private static Object modeScan = new Object();
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private static boolean modeScanDone = false;
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private static String parserMode = "java";
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public psParser() {
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super(LIBX_DEPENDENCIES);
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this.parserName = "PostScript Document Parser";
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if (!modeScanDone) synchronized (modeScan) {
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if (testForPs2Ascii()) parserMode = "ps2ascii";
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else parserMode = "java";
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modeScanDone = true;
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}
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}
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public Hashtable getSupportedMimeTypes() {
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return SUPPORTED_MIME_TYPES;
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}
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public boolean testForPs2Ascii() {
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try {
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String procOutputLine = null;
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StringBuffer procOutput = new StringBuffer();
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Process ps2asciiProc = Runtime.getRuntime().exec(new String[]{"ps2ascii", "--version"});
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BufferedReader stdOut = new BufferedReader(new InputStreamReader(ps2asciiProc.getInputStream()));
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while ((procOutputLine = stdOut.readLine()) != null) {
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procOutput.append(procOutputLine).append(", ");
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}
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int returnCode = ps2asciiProc.waitFor();
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return (returnCode == 0);
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} catch (Exception e) {
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this.theLogger.logInfo("ps2ascii not found. Switching to java parser mode.");
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return false;
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}
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}
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public plasmaParserDocument parse(URL location, String mimeType, String charset, File sourceFile) throws ParserException, InterruptedException {
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File outputFile = null;
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try {
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// creating a temp file for the output
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outputFile = super.createTempFile("ascii.txt");
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// decide with parser mode to use
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if (parserMode.equals("ps2ascii")) {
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parseUsingPS2ascii(sourceFile,outputFile);
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} else {
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parseUsingJava(sourceFile,outputFile);
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}
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// return result
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plasmaParserDocument theDoc = new plasmaParserDocument(
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location,
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mimeType,
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"UTF-8",
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null,
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null,
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"",
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null,
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null,
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outputFile,
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null,
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null);
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return theDoc;
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} catch (Exception e) {
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if (e instanceof InterruptedException) throw (InterruptedException) e;
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if (e instanceof ParserException) throw (ParserException) e;
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// delete temp file
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if (outputFile != null) outputFile.delete();
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// throw exception
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throw new ParserException("Unexpected error while parsing ps file. " + e.getMessage(),location);
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}
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}
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public void parseUsingJava (File inputFile, File outputFile) throws Exception {
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BufferedReader reader = null;
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BufferedWriter writer = null;
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try {
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reader = new BufferedReader(new FileReader(inputFile));
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writer = new BufferedWriter(new FileWriter(outputFile));
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String versionInfoLine = reader.readLine();
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String version = versionInfoLine.substring(versionInfoLine.length()-3);
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int ichar = 0;
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boolean isComment = false;
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boolean isText = false;
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if (version.startsWith("2")) {
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boolean isConnector = false;
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while ((ichar = reader.read()) > 0) {
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if (isConnector) {
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if (ichar < 108) {
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writer.write(' ');
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}
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isConnector = false;
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} else if (ichar == '%') {
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isComment = true;
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} else if (ichar == '\n' && isComment) {
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isComment = false;
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} else if (ichar == ')' && isText ) {
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isConnector = true;
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isText = false;
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} else if (isText) {
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writer.write((char)ichar);
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} else if (ichar == '(' && !isComment) {
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isText = true;
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}
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}
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} else if (version.startsWith("3")) {
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StringBuffer stmt = new StringBuffer();
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boolean isBMP = false;
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boolean isStore = false;
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int store = 0;
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while ((ichar = reader.read()) > 0) {
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if (ichar == '%') {
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isComment = true;
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} else if (ichar == '\n' && isComment){
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isComment = false;
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} else if (ichar == ')' && isText ) {
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isText = false;
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} else if (isText && !isBMP) {
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writer.write((char)ichar);
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} else if (ichar == '(' && !isComment && !isBMP) {
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isText = true;
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} else if (isStore) {
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if (store == 9 || ichar == ' ' || ichar == 10) {
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isStore = false;
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store = 0;
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if (stmt.toString().equals("BEGINBITM")) {
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isText = false;
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isBMP = true;
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} else if (stmt.toString().equals("ENDBITMAP")) {
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isBMP = false;
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}
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stmt.delete(0,stmt.length());
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}
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else {
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stmt.append((char)ichar);
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store++;
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}
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} else if (!isComment && !isStore && (ichar == 66 || ichar == 69)) {
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isStore = true;
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stmt.append((char)ichar);
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store++;
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}
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}
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} else {
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throw new Exception("Unsupported Postscript version '" + version + "'.");
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}
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} finally {
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if (reader != null) try { reader.close(); } catch (Exception e) {/* */}
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if (writer != null) try { writer.close(); } catch (Exception e) {/* */}
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}
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}
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/**
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* This function requires the ghostscript-library
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* @param inputFile
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* @param outputFile
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* @throws Exception
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*/
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private void parseUsingPS2ascii(File inputFile, File outputFile) throws Exception {
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int execCode = 0;
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StringBuffer procErr = null;
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try {
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String procOutputLine = null;
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StringBuffer procOut = new StringBuffer();
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procErr = new StringBuffer();
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Process ps2asciiProc = Runtime.getRuntime().exec(new String[]{"ps2ascii", inputFile.getAbsolutePath(),outputFile.getAbsolutePath()});
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BufferedReader stdOut = new BufferedReader(new InputStreamReader(ps2asciiProc.getInputStream()));
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BufferedReader stdErr = new BufferedReader(new InputStreamReader(ps2asciiProc.getErrorStream()));
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while ((procOutputLine = stdOut.readLine()) != null) {
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procOut.append(procOutputLine);
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}
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while ((procOutputLine = stdErr.readLine()) != null) {
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procErr.append(procOutputLine);
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}
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execCode = ps2asciiProc.waitFor();
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} catch (Exception e) {
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String errorMsg = "Unable to convert ps to ascii. " + e.getMessage();
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this.theLogger.logSevere(errorMsg);
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throw new Exception(errorMsg);
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}
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if (execCode != 0) throw new Exception("Unable to convert ps to ascii. ps2ascii returned statuscode " + execCode + "\n" + procErr.toString());
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}
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public void reset() {
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// Nothing todo here at the moment
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super.reset();
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}
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public plasmaParserDocument parse(URL location, String mimeType, String charset, InputStream source) throws ParserException, InterruptedException {
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File tempFile = null;
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try {
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// creating a tempfile
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tempFile = super.createTempFile("temp.ps");
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tempFile.deleteOnExit();
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// copying inputstream into file
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serverFileUtils.copy(source,tempFile);
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// parsing the file
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return parse(location,mimeType,charset,tempFile);
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} catch (Exception e) {
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if (e instanceof InterruptedException) throw (InterruptedException) e;
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if (e instanceof ParserException) throw (ParserException) e;
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throw new ParserException("Unable to parse the ps file. " + e.getMessage(),location, e);
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} finally {
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if (tempFile != null) try{ tempFile.delete(); }catch(Exception e) {/* */}
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}
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}
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}
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