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303 lines
12 KiB
303 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@yacy.net
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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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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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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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package net.yacy.document.parser;
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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.HashSet;
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import java.util.Set;
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import net.yacy.document.AbstractParser;
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import net.yacy.document.Document;
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import net.yacy.document.Idiom;
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import net.yacy.document.ParserException;
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import net.yacy.kelondro.data.meta.DigestURI;
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import net.yacy.kelondro.util.FileUtils;
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public class psParser extends AbstractParser implements Idiom {
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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 Set<String> SUPPORTED_MIME_TYPES = new HashSet<String>();
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public static final Set<String> SUPPORTED_EXTENSIONS = new HashSet<String>();
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static {
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SUPPORTED_EXTENSIONS.add("ps");
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SUPPORTED_MIME_TYPES.add("application/postscript");
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SUPPORTED_MIME_TYPES.add("application/ps");
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SUPPORTED_MIME_TYPES.add("application/x-postscript");
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SUPPORTED_MIME_TYPES.add("application/x-ps");
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SUPPORTED_MIME_TYPES.add("application/x-postscript-not-eps");
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}
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private final 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("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 Set<String> supportedMimeTypes() {
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return SUPPORTED_MIME_TYPES;
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}
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public Set<String> supportedExtensions() {
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return SUPPORTED_EXTENSIONS;
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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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final StringBuilder procOutput = new StringBuilder();
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final Process ps2asciiProc = Runtime.getRuntime().exec(new String[]{"ps2ascii", "--version"});
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final 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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stdOut.close();
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final int returnCode = ps2asciiProc.waitFor();
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return (returnCode == 0);
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} catch (final Exception e) {
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if (this.theLogger != null) 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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@Override
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public Document parse(final DigestURI location, final String mimeType, final String charset, final 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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final Document theDoc = new Document(
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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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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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false);
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return theDoc;
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} catch (final 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) FileUtils.deletedelete(outputFile);
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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 (final File inputFile, final 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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final String versionInfoLine = reader.readLine();
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final String version = (versionInfoLine == null) ? "" : 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.length() > 0 && version.charAt(0) == '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.length() > 0 && version.charAt(0) == '3') {
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final StringBuilder stmt = new StringBuilder();
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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 (final Exception e) {/* */}
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if (writer != null) try { writer.close(); } catch (final 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(final File inputFile, final File outputFile) throws Exception {
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int execCode = 0;
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StringBuilder procErr = null;
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try {
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String procOutputLine = null;
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final StringBuilder procOut = new StringBuilder();
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procErr = new StringBuilder();
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final Process ps2asciiProc = Runtime.getRuntime().exec(new String[]{"ps2ascii", inputFile.getAbsolutePath(),outputFile.getAbsolutePath()});
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final BufferedReader stdOut = new BufferedReader(new InputStreamReader(ps2asciiProc.getInputStream()));
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final 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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stdOut.close();
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while ((procOutputLine = stdErr.readLine()) != null) {
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procErr.append(procOutputLine);
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}
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stdErr.close();
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execCode = ps2asciiProc.waitFor();
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} catch (final Exception e) {
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final 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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@Override
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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 Document parse(final DigestURI location, final String mimeType, final String charset, final 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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FileUtils.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 (final 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);
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} finally {
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if (tempFile != null) FileUtils.deletedelete(tempFile);
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}
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}
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}
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