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An Open Source JavaFX PDF Viewer
/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2016 IDRsolutions and Contributors.
*
* This file is part of JPedal/JPDF2HTML5
*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---------------
* RhinoParser.java
* ---------------
*/
package org.jpedal.objects.javascript;
import java.util.List;
import java.util.StringTokenizer;
import javax.swing.SwingUtilities;
import org.jpedal.objects.Javascript;
import org.jpedal.objects.acroforms.AcroRenderer;
import org.jpedal.objects.acroforms.ReturnValues;
import org.jpedal.objects.acroforms.actions.ActionHandler;
import org.jpedal.objects.acroforms.creation.FormFactory;
import org.jpedal.objects.javascript.defaultactions.DisplayJavascriptActions;
import org.jpedal.objects.javascript.defaultactions.JpedalDefaultJavascript;
import org.jpedal.objects.javascript.functions.JSFunction;
import org.jpedal.objects.layers.Layer;
import org.jpedal.objects.layers.PdfLayerList;
import org.jpedal.objects.raw.FormObject;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.utils.LogWriter;
import org.jpedal.utils.StringUtils;
public class RhinoParser extends DefaultParser implements ExpressionEngine{
/** version details of our library, so javascript knows what it can do,
* also adds static adobe methods to javascript for execution if called
*/
private static final String viewerSettings = AformDefaultJSscript.getViewerSettings()+
AformDefaultJSscript.getstaticScript();
private org.mozilla.javascript.Context cx;
private org.mozilla.javascript.Scriptable scope;
private String functions="";
/** used to stop the thread that called execute from returning
* before the javascript has been executed on the correct thread.
*/
private boolean javascriptRunning;
private final Javascript JSObj;
public RhinoParser(final Javascript js) {
JSObj = js;
}
/** make sure the contaxt has been exited */
@Override
public void flush() {
if(acro!=null && acro.getFormFactory()!=null){
if(acro.getCompData().formsRasterizedForDisplay()){
flushJS();
}else if (SwingUtilities.isEventDispatchThread()){
flushJS();
}else {
final Runnable doPaintComponent = new Runnable() {
@Override
public void run() {
flushJS();
}
};
try {
SwingUtilities.invokeAndWait(doPaintComponent);
} catch (final Exception e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
}
}
}
/** should only be called from our Thread code and not by any other access, as it wont work properly */
public void flushJS(){
//clear the stored functions when moving between files
functions="";
// Make sure we exit the current context
if (cx != null){
// The context could be in a different thread,
// we need to check for this and exit in a set way.
try{
org.mozilla.javascript.Context.exit();
// remembering to reset cx to null so that we recreate the contaxt for the next file
cx = null;
}catch(final IllegalStateException e){
LogWriter.writeLog("Exception: " + e.getMessage());
}
}
}
/** NOT TO BE USED, is a dummy method for HTML only, WILL BE DELETED ONE DAY */
public void setJavaScriptEnded(){
javascriptRunning = false;
}
/**
* store and execute code
*/
public void executeFunctions(final String code, final FormObject ref, final AcroRenderer acro) {
//set to false at end of executeJS method
javascriptRunning=true;
if(acro.getFormFactory().getType()== FormFactory.SWING){
if (SwingUtilities.isEventDispatchThread()){
executeJS( code, ref, acro);
}else {
final Runnable doPaintComponent = new Runnable() {
@Override
public void run() {
executeJS( code, ref, acro);
}
};
try {
SwingUtilities.invokeAndWait(doPaintComponent);
} catch (final Exception e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
}
while(javascriptRunning){
try {
Thread.sleep(1000);
} catch (final InterruptedException e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
}
}
}
/** should only be called from our Thread code and not by any other access, as it wont work properly */
public void executeJS(String code, final FormObject ref, final AcroRenderer acro) {
final String defSetCode;
//NOTE - keep everything inside thr try, catch, finally, as the finally tidy's up so that the code will return properly.
try {
//if we have no code dont do anything
if(code.isEmpty() && functions.isEmpty()) {
return;
}
//check if any functions defined in code and save
String func = "";
int index1 = code.indexOf("function ");
while(index1!=-1){//if we have functions
int i = index1+8, bracket=0;
char chr = code.charAt(i);
while(true){//find the whole function
if(chr=='{'){
bracket++;
}
if(chr=='}'){
bracket--;
if(bracket==0) {
break;
}
}
//remember to get next char before looping again
chr = code.charAt(i++);
}
//find beginning of line for start
int indR = code.lastIndexOf('\r', index1);
int indN = code.lastIndexOf('\n', index1);
final int indS = ((indN", 1, null);
// Now evaluate the string we've collected.
cx.evaluateString(scope, code, "", 1, null);
} catch (final Exception e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}finally{
//sync any changes made in Layers (we need to get as method static at moment)
final PdfLayerList layersObj=acro.getActionHandler().getLayerHandler();
if(layersObj!=null && layersObj.getChangesMade()){
if(Layer.debugLayer) {
System.out.println("changed");
}
try {
//if we call decode page, i'm pritty sure we will recall the layers code, as we would recall all the JS
//hence the infinate loop
acro.getActionHandler().getPDFDecoder().decodePage(-1);
//@fixme
//final org.jpedal.gui.GUIFactory swingGUI=((org.jpedal.examples.viewer.gui.SwingGUI)acro.getActionHandler().getPDFDecoder().getExternalHandler(Options.GUIContainer));
// if(swingGUI!=null) {
// swingGUI.rescanPdfLayers();
//}
//repaint pdf decoder to make sure the layers are repainted
//((org.jpedal.PdfDecoder)acro.getActionHandler().getPDFDecoder()).repaint();//good idea mark
} catch (final Exception e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
}
//run through all forms and see if they have changed
//acro.updateChangedForms();
//always set the javascript flag to false so that the execute calling thread can resume from its endless loop.
javascriptRunning = false;
}
}
/** replace javascript variables with our own so rhino can easily identify them and pass excution over to us */
private static String preParseCode(String script) {
final String[] searchFor = {"= (\"%.2f\",","this.ADBE"," getField(","\ngetField(","\rgetField(",
"(getField(","this.getField(","this.resetForm(","this.pageNum"," this.getOCGs(","\nthis.getOCGs(",
"\rthis.getOCGs("," getOCGs(","\ngetOCGs(","\rgetOCGs(",".state="};
final String[] replaceWith = {"= util.z(\"%.2f\",","ADBE"," acro.getField(","\nacro.getField(","\racro.getField(",
"(acro.getField(","acro.getField(","acro.resetForm(","acro.pageNum"," layers.getOCGs(","\nlayers.getOCGs(",
"\rlayers.getOCGs("," layers.getOCGs(","\nlayers.getOCGs(","\rlayers.getOCGs(","\rlayers.getOCGs("};
for(int i=0;iindexStart)) {
indexStart = indextmp;
}
buf.append(script.substring(0,indexStart+1));
//find the end of the string
int speech = script.indexOf('\"',indexs);
speech = script.indexOf('\"',speech+1);
while(script.charAt(speech-1)=='\\') {
speech = script.indexOf('\"', speech);
}
//make sure there is an argument ',' after it
final int startArgs = script.indexOf(',',speech);
final int endArgs = script.indexOf(')',startArgs);
//setup arguments string so we can setup in javascript
final String arguments = script.substring(startArgs+1, endArgs);
if(arguments.equals("printfArgs")) {
break printf;
}
final StringTokenizer tok = new StringTokenizer(arguments,", ");
//create array in javascript code
buf.append("var printfArgs=new Array();\n");
//add arguments to the array
int i=0;
while(tok.hasMoreTokens()){
buf.append("printfArgs[");
buf.append(i++);
buf.append("]=");
buf.append(tok.nextToken());
buf.append(";\n");
}
//add printf command with new array as argument
buf.append(script.substring(indexStart+1, startArgs+1));
buf.append("printfArgs");
buf.append(script.substring(endArgs));
script = buf.toString();
}
script = checkAndReplaceCode("event.value=AFMakeNumber(acro.getField(\"sum\").value)(8)","", script);
script = checkAndReplaceCode("calculate = false", "calculate = 0", script);
script = checkAndReplaceCode("calculate = true", "calculate = 1", script);
script = checkAndReplaceCode("calculate=false", "calculate=0", script);
script = checkAndReplaceCode("calculate=true", "calculate=1", script);
return script;
}
// private static String checkAndAddParentToKids(String script, AcroRenderer acro){
//
// String startCode = "acro.getField(\"";
// //find start of GetField statement
// int startIndex = script.indexOf(startCode);
// if(startIndex!=-1){
// int startNameInd = startIndex+15;
// int endNameInd = script.indexOf("\")", startIndex);
// int endIndex = script.indexOf(';', startIndex)+1;
//
// //get the name its calling
// String name = script.substring(startNameInd, endNameInd);
// //if it ends with a . then we have to replace with all kids.
// if(name.endsWith(".")){
//
// //removed by Mark 16042013
// String[] allFieldNames = acro.getChildNames(name);
//
// // add start of script
// StringBuilder buf = new StringBuilder();
// buf.append(script.substring(0,startIndex));
//
// // add modified script with all fieldnames
// for (int j = 0; j < allFieldNames.length; j++) {
// if(j>0)
// buf.append('\n');
// buf.append(startCode);
// buf.append(allFieldNames[j]);
// buf.append(script.substring(endNameInd,endIndex));
// }
//
// // add end of script
// buf.append(script.substring(endIndex,script.length()));
// script = buf.toString();
// }
// }
// return script;
// }
/** replace the searchFor string with the replaceWith string within the code specified */
private static String checkAndReplaceCode(final String searchFor, final String replaceWith,String script) {
final int index = script.indexOf(searchFor);
if(index!=-1){
String buf = script.substring(0, index) +
replaceWith +
checkAndReplaceCode(searchFor, replaceWith, script.substring(index + searchFor.length(), script.length()));
script = buf;
}
return script;
}
/** add the javascript standard execution objects, that acrobat app has defined functions for. */
private void addStdObject(final AcroRenderer acro) {
Object objToJS = org.mozilla.javascript.Context.javaToJS( new JpedalDefaultJavascript(scope,cx), scope );
//util added for jpedal use ONLY
org.mozilla.javascript.ScriptableObject.putProperty( scope, "util", objToJS );
// app added so that methods difined within adobes javascript can be implemented
org.mozilla.javascript.ScriptableObject.putProperty( scope, "app", objToJS );
final org.mozilla.javascript.Scriptable globalObj = cx.newObject(scope);
//global is added to allow javascript to define and create its own variables
org.mozilla.javascript.ScriptableObject.putProperty( scope, "global", globalObj );
final org.mozilla.javascript.Scriptable ADBE = cx.newObject(scope);
//global is added to allow javascript to define and create its own variables
org.mozilla.javascript.ScriptableObject.putProperty( scope, "ADBE", ADBE );
objToJS = org.mozilla.javascript.Context.javaToJS( new DisplayJavascriptActions(), scope );
// display adds constant definitions of values
org.mozilla.javascript.ScriptableObject.putProperty( scope, "display", objToJS );
// color adds default constant colors.
org.mozilla.javascript.ScriptableObject.putProperty( scope, "color", objToJS );
// add layers to rhino
final PdfLayerList layerList = acro.getActionHandler().getLayerHandler();
if(layerList!=null){
objToJS = org.mozilla.javascript.Context.javaToJS( layerList, scope );
//not working yet.
org.mozilla.javascript.ScriptableObject.putProperty( scope, "layers", objToJS );//CHRIS @javascript
}
// add a wrapper for accessing the forms etc
objToJS = org.mozilla.javascript.Context.javaToJS( acro, scope );
//acro added to replace 'this' and to allow access to form objects via the acroRenderer
org.mozilla.javascript.ScriptableObject.putProperty( scope, "acro", objToJS );
}
/** add functions to the javascript code to be executed within rhino */
@Override
public int addCode(final String value) {
functions += preParseCode(value);
return 0;
}
/** typeToReturn
* 0 = String,
* 1 = Double,
* -1 = guess
*/
public org.mozilla.javascript.Scriptable generateJStype(final String textString, final boolean returnAsString){
if(returnAsString){
return cx.newObject(scope, "String", new Object[] { textString });
}else {
if(textString!=null && !textString.isEmpty() && StringUtils.isNumber(textString) &&
!(textString.length()==1 && textString.indexOf('.')!=-1)){//to stop double trying to figure out "."
final Double retNum = Double.valueOf(textString);
return cx.newObject(scope, "Number", new Object[] { retNum });
}else {
return cx.newObject(scope, "String", new Object[] { textString });
}
}
}
/**
* execute javascript and reset forms values
*/
@Override
public int execute(final FormObject form, final int type, final String code, final int eventType, final char keyPressed) {
int messageCode;
final String js = code;
//convert into args array
final String[] args= JSFunction.convertToArray(js);
final String command=args[0];
if(command.startsWith("AF")) {
messageCode = handleAFCommands(form, command, js, args, eventType, keyPressed);
} else {
executeFunctions(js, form, acro);
messageCode = ActionHandler.VALUESCHANGED;
}
if(type == PdfDictionary.F) {
calcualteEvent();
messageCode = ActionHandler.VALUESCHANGED;
}
return messageCode;
}
private void calcualteEvent() {
// System.out.println("CALC");
final List obs = acro.getCompData().getFormComponents(null, ReturnValues.FORMOBJECTS_FROM_REF, -1);
final Object[] formObjects = obs.toArray();
for(final Object o : formObjects) {
final FormObject formObject = (FormObject) o;
final String ref = formObject.getObjectRefAsString();
final String name = formObject.getTextStreamValue(PdfDictionary.T);
final String command = JSObj.getJavascriptCommand( (name != null ? name : ref), PdfDictionary.C2);
if(command != null) {
// System.out.println(command);
execute(formObject, PdfDictionary.C2, command, ActionHandler.FOCUS_EVENT, ' ');
}
}
}
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