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/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
package org.openoffice.xmerge.converter.xml.sxc.pexcel.records.formula;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Iterator;
import org.openoffice.xmerge.converter.xml.sxc.pexcel.records.Workbook;
/**
* This Helper class provides a simplified interface to conversion between PocketXL formula representation
* and Calc formula representation.<p>
* The class is used by {@link org.openoffice.xmerge.converter.xml.sxc.pexcel.records.Formula}
*/
public class FormulaHelper {
private static FormulaParser parser;
private static FormulaCompiler compiler;
private static TokenEncoder encoder;
private static TokenDecoder decoder;
private boolean rangeType = false;
private boolean expressionType = false;
static {
parser = new FormulaParser();
compiler = new FormulaCompiler();
encoder = new TokenEncoder();
decoder = new TokenDecoder();
}
/**
* Sets the workbook cache so that global data such as
* <code>DefinedNames</code>, <code>Boundsheets</code> can be read
*
* @param wb Wrokbook object containing all the global data
*/
public void setWorkbook(Workbook wb) {
encoder.setWorkbook(wb);
decoder.setWorkbook(wb);
parser.setWorkbook(wb);
}
/**
* Convertes a string representation of a calc formula into an array of PocketXL bytes
* @param formula The Formula String (e.g. 1+SUM(A1,B1))
*
* @throws UnsupportedFunctionException Thrown if a function in the formula is nto supported by Pocket Excel
* @throws FormulaParsingException Thrown when the formula is not well formed
*
*/
public byte[] convertCalcToPXL(String formula) throws UnsupportedFunctionException, FormulaParsingException {
ArrayList<Token> parseTokens = parser.parse(formula);
ArrayList<Token> rpnTokens = compiler.infix2RPN(parseTokens);
ByteArrayOutputStream bytes = null;
try {
bytes = new ByteArrayOutputStream();
for (Iterator<Token> e = rpnTokens.iterator(); e.hasNext();) {
Token t = e.next();
bytes.write(encoder.getByte(t));
}
} catch (IOException e) {
}
return bytes.toByteArray();
}
/**
* Converts a PocketXL byte array into a Calc function string
* @param formula A byte array that contains the PocketXL bytes for a formula
*
*/
public String convertPXLToCalc(byte[] formula) {
ArrayList<Token> parseTokens = decoder.getTokenVector(formula);
ArrayList<Token> infixTokens = compiler.RPN2Infix(parseTokens);
StringBuffer buff = new StringBuffer();
for (Iterator<Token> e = infixTokens.iterator();e.hasNext();) {
Token t = e.next();
buff.append(t.toString());
// If we are parsing a Name definition we need to know if it is of
// type range or expression
if(!t.isOperand()) {
expressionType = true;
}
}
if(!expressionType) {
rangeType = true;
}
return "=" + buff.toString();
}
/**
* Returns a boolean indicating whether or not the byte[] parsed is of
* type range. This means it contains only a cell reference and no
* operators. This is necessry because the syntax for range and expression
* types differs. This is only of interest when dealing with
* <code>DefinedNames</code> and not <code>Formula</code>
*
* @return a boolean true if of type range otherwise false
*
*/
public boolean isRangeType() {
return rangeType;
}
/**
* Returns a boolean indicating whether or not the byte[] parsed is of
* type expression. This means it contains operators. This is necessry
* because the syntax for range and expression types differs. This is
* only of interest when dealing with <code>DefinedNames</code> and not
* <code>Formula</code>
*
* @return a boolean true if of type expression otherwise false
*
*/
public boolean isExpressionType() {
return expressionType;
}
}
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