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org.jpedal.objects.javascript.GenericParser Maven / Gradle / Ivy
/*
* ===========================================
* 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
*
* ---------------
* GenericParser.java
* ---------------
*/
package org.jpedal.objects.javascript;
import java.io.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.script.*;
import javax.swing.SwingUtilities;
import org.jpedal.objects.Javascript;
import org.jpedal.objects.acroforms.AcroRenderer;
import org.jpedal.objects.acroforms.actions.ActionHandler;
import org.jpedal.objects.javascript.jsobjects.JSConsole;
import org.jpedal.objects.javascript.jsobjects.JSDoc;
import org.jpedal.objects.javascript.jsobjects.JSField;
import org.jpedal.objects.raw.FormObject;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.utils.LogWriter;
public class GenericParser implements ExpressionEngine {
private static final String[] engineOrder = {"nashorn", "rhino"};
private AcroRenderer acroRenderer;
private ScriptEngine engine;
private final ScriptContext context;
private JSDoc docObject;
private final Javascript jsObject;
private static final boolean debugEngine = false;
private static ArrayList erroredCode;
public GenericParser(final Javascript jsObject) throws Exception {
this.jsObject = jsObject;
final ScriptEngineManager engineManager = new ScriptEngineManager();
int i = 0;
while (engine == null && i < engineOrder.length) {
engine = engineManager.getEngineByName(engineOrder[i]);
i++;
}
if (engine == null) {
throw new Exception("Could not load a suitable ScriptEngine for parsing JavaScript, are you using a fully fledged JVM?");
} else {
if (debugEngine) {
final ScriptEngineFactory factory = engine.getFactory();
System.out.println("Using JavaScript Engine: " + factory.getEngineName());
System.out.println("Engine Version:" + factory.getEngineVersion());
System.out.println("Language Version: " + factory.getLanguageVersion());
}
context = engine.getContext();
}
}
public void setupPDFObjects(final Javascript jsObject) {
// Insert code for setting up PDF objects here
try {
if (debugEngine) {
System.out.println("Setting up Java bindings of objects.");
}
docObject = new JSDoc();
docObject.setAcroRenderer(acroRenderer);
context.setAttribute("JSDoc", docObject, ScriptContext.ENGINE_SCOPE);
context.setAttribute("app", new JSApp(), ScriptContext.ENGINE_SCOPE);
// context.setAttribute("event", new JSEvent(), ScriptContext.ENGINE_SCOPE);
final JSConsole console = new JSConsole();
context.setAttribute("console", console, ScriptContext.ENGINE_SCOPE);
//console.setGUIFactory(this.guiFactory);
if (debugEngine) {
System.out.println("Parsing aform.js");
}
final BufferedReader JSObjectsReader = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream("/org/jpedal/objects/javascript/jsobjects/JSObjects.js")));
engine.eval(JSObjectsReader);
engine.eval("var event = new Event();");
final BufferedReader br = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream("/org/jpedal/objects/javascript/aform.js")));
engine.eval(br);
final String onLoadJS = preParseJS(jsObject.getJavaScript(null), true);
if (onLoadJS != null && !onLoadJS.isEmpty()) {
if (debugEngine) {
System.out.println(onLoadJS);
}
try {
engine.eval(onLoadJS);
} catch (final ScriptException e) {
// debugLog("setup Code: " + onLoadJS + "\r\n" + e.getMessage() + "\r\n");
e.printStackTrace();
}
}
} catch (final ScriptException e) {
// debugLog("aforms error:\r\n" + e.getMessage() + "\r\n");
e.printStackTrace();
}
}
@Override
public int execute(final FormObject ref, final int type, String js, final int eventType, final char keyPressed) {
// ignore unknown keypresses
if (keyPressed == 65535) {
return 0;
}
if (debugEngine) {
System.out.println("execute(FormObject ref, int type, Object js, int eventType, char keyPressed)");
System.out.println("execute(" + '[' + ref.getObjectRefAsString() + ']' + ", " + PdfDictionary.showAsConstant(type) + ", \"" + js + "\", " + ", " + keyPressed + ')');
}
if (js instanceof String) {
js = preParseJS(js, false);
try {
// The following line causes issues in Java 8, It was not needed anyway as we change what "event" refers to which should tell the gc to delete the object.
// context.removeAttribute("event", ScriptContext.ENGINE_SCOPE); // remove the event
// JSEvent event = new JSEvent(type);
engine.eval("var event = new Event(" + type + ");");
engine.eval("event.target = JSDoc.getFieldByRef('" + ref.getObjectRefAsString() + "');");
engine.eval("event.value = '" + ref.getValue() + "';");
} catch (final ScriptException ex) {
Logger.getLogger(GenericParser.class.getName()).log(Level.SEVERE, null, ex);
}
// context.setAttribute("event", event, ScriptContext.ENGINE_SCOPE); // create a new event object for each event
//docObject.setField(ref.getObjectRefAsString(), ref);
// event.target = docObject.getFieldByRef(ref.getObjectRefAsString());
// event.value = String.valueOf(ref.getValue());
// System.out.println("HI:=" + ref.getValue());
final Object returnObject;
try {
// engine.eval("app.alert(\"This is a test\");"); // basic alert test, works!
// engine.eval("app.alert(\"This is a test\", 1, 0);"); // advanced alert test, works!
// engine.eval("var a = new Array(\"RGB\", 0.5, 0.5, 1); console.log(a); var s = ColorConvert(a, \"CMYK\"); console.log(s);"); // Colorspace test, works!
returnObject = engine.eval(js, context);
final Object eventTarget = engine.eval("event.target");
final Object eventValue = engine.eval("event.value");
if (eventTarget != null && eventType == ActionHandler.FOCUS_EVENT) {
final JSField field = (JSField) eventTarget;
field.value = eventValue;
final boolean isSelected = false;
field.syncToGUI(isSelected);
}
if (returnObject != null) {
// Do stuff with the result?
if (debugEngine) {
System.out.println("returnObject=" + returnObject);
}
}
final Object event = engine.eval("event");
final Object eventName = engine.eval("event.name");
if (event != null && eventName != null && eventName.equals("Format")) {
calcualteEvent();
}
} catch (final ScriptException e) {
// debugLog("execute Code: " + (String) js + "\r\n" + e.getMessage() + "\r\n");
e.printStackTrace();
}
}
return 0;
}
@Override
public void closeFile() {
flush();
}
@Override
public boolean reportError(final int code, final Object[] args) {
// This Method doesn't appear to be used in the DefaultParser or RhinoParser
if (debugEngine) {
System.out.println("reportError(int code, Object[] args)");
System.out.println("reportError(" + code + ", " + Arrays.toString(args) + ')');
}
return false;
}
@Override
public int addCode(String value) {
value = preParseJS(value, true);
if (debugEngine) {
System.out.println("addCode(String value)");
System.out.println("value={\n" + value + "\n}");
}
final String finalValue = value;
final Runnable r = new Runnable() {
@Override
public void run() {
try {
engine.eval(finalValue, context); // attempt to evaluate given code
} catch (final ScriptException e) {
// debugLog("addCode Code: " + finalValue + "\r\n" + e.getMessage() + "\r\n");
e.printStackTrace();
}
}
};
SwingUtilities.invokeLater(r);
return 0;
}
@Override
public void executeFunctions(final String jsCode, final FormObject formObject) {
if (debugEngine) {
System.out.println("executeFunctions(String jsCode, FormObject formObject)");
System.out.println("executeFunctions(\"" + jsCode + "\", [" + formObject.getObjectRefAsString() + "])");
}
//does nothing in default
}
@Override
public void dispose() {
if (debugEngine) {
System.out.println("dispose()");
}
}
@Override
public void setAcroRenderer(final AcroRenderer acro) {
acroRenderer = acro;
docObject.setAcroRenderer(acro);
}
private void flush() {
if (debugEngine) {
System.out.println("flush()");
}
// This Method doesn't appear to be used in the DefaultParser but does in the RhinoParser
docObject.flush();
}
private void calcualteEvent() {
// System.out.println("CALC");
final FormObject[] formObjects = docObject.getFormObjects();
for (final FormObject formObject : formObjects) {
final String ref = formObject.getObjectRefAsString();
final String name = formObject.getTextStreamValue(PdfDictionary.T);
String command = jsObject.getJavascriptCommand((name != null ? name : ref), PdfDictionary.C2);
// System.out.println(command);
if (command != null) {
command = preParseJS(command, false);
// System.out.println("execute calc=" + command);
//JSEvent event = new JSEvent(PdfDictionary.C2);
//context.setAttribute("event", event, ScriptContext.ENGINE_SCOPE); // create a new event object for each event
//event.target = docObject.getFieldByRef(ref);
try {
engine.eval("var event = new Event(" + PdfDictionary.C2 + ");", context);
engine.eval("event.target = JSDoc.getFieldByRef('" + ref + "');", context);
engine.eval(command, context);
final JSField field = (JSField) engine.eval("event.target", context);
final Boolean rc = (Boolean) engine.eval("event.rc", context);
// System.out.println(field);
if (field != null && rc) {
final Object value = engine.eval("event.value", context);
if (value != null) {
field.value = value.toString();
} else {
field.value = null;
}
final boolean isSelected = false;
field.syncToGUI(isSelected);
}
} catch (final ScriptException e) {
// debugLog("Calculate Code: " + command + "\r\n" + e.getMessage() + "\r\n");
e.printStackTrace();
}
}
}
}
private static String preParseJS(String js, final boolean isDocumentLevel) {
js = addMethodstoObject(makeGlobalVars(js));
js = fixGetFields(js);
if (isDocumentLevel) {
// String testSolution = "this.getField = function(f) {return Doc.getField(f);}\n";
// js = js.replace("this", "Doc"); // temp
// js = fixCallsToThisVars(js);
js = "(function() {" + js + "}).call(Doc);";
}
// Page 709 of JavaScript for Acrobat API Reference for details on what `this` should refer to
// In most cases it should refer to the current Doc object, hence the current code
return js;
}
// private String fixCallsToThisVars(String js) {
//
// String lines[] = js.split("\\n");
// HashMap defined = new HashMap();
// HashMap definedToLine = new HashMap();
// int bracketCount = 0;
// int i = 0;
// for(String line : lines) {
// i ++;
// if(bracketCount == 0) {
//// Pattern pat = Pattern.compile("this.\\w+\\s?=\\s?");
//// Pattern pat = Pattern.compile("this\\.");
//// Matcher mat = pat.matcher(line);System.out.println("call me " +mat.groupCount());
//// if(mat.groupCount() >= 1) {
//// String s = mat.group();
//// s = s.replace("this.", "");
//// s = s.substring(0, s.indexOf("="));
//// System.out.println("F OFF " + s);
//// defined.put(bracketCount, s);
//// }
// int thisPos = line.indexOf("this.");
// int equalsPs = line.indexOf("=");
// if(thisPos != -1 && equalsPs != -1) {
// String s = line.substring(thisPos, equalsPs);
// if(s.endsWith(" ")) {
// s = s.substring(0, s.lastIndexOf(" "));
// }
// if(defined.containsKey(s) && defined.get(s) >= bracketCount) {
// lines[i] = line.replace(s, "var " + )
// }
// defined.put(s, bracketCount);
// definedToLine.put(s, i);
// }
// }
// if(line.endsWith("{")) {
// bracketCount ++;
// }
// else if(bracketCount > 0 && line.startsWith("}")) {
// bracketCount --;
// }
// "this.\\w+\\s?=\\s?"
// }
// return js;
// }
/**
* changes references to this.getField to Doc.getField and also turns references to getField to Doc.getField
*
* @param js
* @return
*/
private static String fixGetFields(String js) {
final Pattern pat = Pattern.compile("[^.]getField\\(");
final Matcher mat = pat.matcher(js);
while (mat.find()) {
final String s = mat.group();
js = js.replace(s, s.charAt(0) + "Doc.getField(");
}
js = js.replace("this.getField(", "Doc.getField(");
return js;
}
/**
* Turns function declarations like function thisIsAFunction(param) {...} into:
* this.thisIsAFunction = function(param) {...}
*
* @param js
* @return
*/
private static String addMethodstoObject(final String js) {
final Pattern pat = Pattern.compile("function\\s\\w+\\((\\w+)?\\)");
final Matcher mat = pat.matcher(js);
final HashMap mapping = new HashMap();
while (mat.find()) {
final String s = mat.group();
final String methodSig = js.substring(mat.start() + 9, mat.end()); // showCurrent() or augment(digit)
final int firstBracket = methodSig.indexOf('(');
final String methodName = methodSig.substring(0, firstBracket);
final String newMethodSig = "this." + methodName + " = " + "function" + methodSig.substring(firstBracket);
mapping.put(s, newMethodSig);
}
String newJs = js;
for (final String s : mapping.keySet()) {
newJs = newJs.replace(s, mapping.get(s));
}
return newJs;
}
private static String makeGlobalVars(final String js) {
final String trimmed = trimToGlobal(js);
final Pattern pat = Pattern.compile("var\\s\\w+\\s?=\\s?");
final Matcher mat = pat.matcher(trimmed);
final HashMap mapping = new HashMap();
while (mat.find()) {
final String s = mat.group();
final String sig = trimmed.substring(mat.start() + 4, mat.end());
int nameEndPos = 0;
while (sig.charAt(nameEndPos) != ' ' && sig.charAt(nameEndPos) != '=' && nameEndPos < sig.length()) {
nameEndPos++;
}
final String name = sig.substring(0, nameEndPos);
mapping.put(s.substring(0, 4 + name.length()), "this." + name);
}
String newJs = js;
for (final String s : mapping.keySet()) {
newJs = newJs.replace(s, mapping.get(s));
}
if (debugEngine) {
System.out.println(newJs);
}
return newJs;
}
private static String trimToGlobal(String js) {
// only show the text that is not within code blocks or quotes
final StringBuilder sb = new StringBuilder();
boolean inCurlyBrackets = false;
boolean inBrackets = false;
boolean inQuotes = false;
boolean inDblQuotes = false;
int index = 0;
while (index < js.length()) {
final char c = js.charAt(index);
if (!inDblQuotes) {
if (c == '\"') {
inDblQuotes = true;
} else {
if (!inQuotes) {
if (c == '\'') {
inQuotes = true;
} else {
if (!inCurlyBrackets) {
if (c == '{') {
inCurlyBrackets = true;
} else {
if (!inBrackets) {
if (c == '(') {
inBrackets = true;
} else if (c != ')' && c != '}') {
sb.append(c);
}
} else {
if (c == ')') {
inBrackets = false;
}
}
}
} else {
if (c == '}') {
inCurlyBrackets = false;
}
}
}
} else {
if (c == '\'') {
inQuotes = false;
}
}
}
} else {
if (c == '\"') {
inDblQuotes = false;
}
}
index++;
}
js = sb.toString();
// js = js.replaceAll("var\\s", "this.");
return js;
}
public static void debugLog(final String log) {
final File logfile = new File("JSErrorLog.txt");
try {
if (logfile.createNewFile()) {
System.err.println("Javascript error log file created: " + logfile.getAbsolutePath());
}
if (erroredCode == null) {
erroredCode = new ArrayList();
}
if (erroredCode.contains(log)) {
return;
}
final BufferedWriter out = new BufferedWriter(new FileWriter(logfile, true));
out.write(log);
out.close();
erroredCode.add(log);
} catch (final IOException e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
}
}
