905 lines
29 KiB
Java
905 lines
29 KiB
Java
/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.hssf.model;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Stack;
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import java.util.regex.Pattern;
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//import PTG's .. since we need everything, import *
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import org.apache.poi.hssf.record.formula.*;
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import org.apache.poi.hssf.record.formula.function.FunctionMetadata;
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import org.apache.poi.hssf.record.formula.function.FunctionMetadataRegistry;
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import org.apache.poi.hssf.usermodel.HSSFWorkbook;
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/**
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* This class parses a formula string into a List of tokens in RPN order.
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* Inspired by
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* Lets Build a Compiler, by Jack Crenshaw
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* BNF for the formula expression is :
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* <expression> ::= <term> [<addop> <term>]*
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* <term> ::= <factor> [ <mulop> <factor> ]*
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* <factor> ::= <number> | (<expression>) | <cellRef> | <function>
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* <function> ::= <functionName> ([expression [, expression]*])
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*
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* @author Avik Sengupta <avik at apache dot org>
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* @author Andrew C. oliver (acoliver at apache dot org)
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* @author Eric Ladner (eladner at goldinc dot com)
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* @author Cameron Riley (criley at ekmail.com)
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* @author Peter M. Murray (pete at quantrix dot com)
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* @author Pavel Krupets (pkrupets at palmtreebusiness dot com)
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*/
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public final class FormulaParser {
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/**
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* Specific exception thrown when a supplied formula does not parse properly.<br/>
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* Primarily used by test cases when testing for specific parsing exceptions.</p>
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*
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*/
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static final class FormulaParseException extends RuntimeException {
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// This class was given package scope until it would become clear that it is useful to
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// general client code.
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public FormulaParseException(String msg) {
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super(msg);
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}
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}
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public static final int FORMULA_TYPE_CELL = 0;
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public static final int FORMULA_TYPE_SHARED = 1;
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public static final int FORMULA_TYPE_ARRAY =2;
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public static final int FORMULA_TYPE_CONDFOMRAT = 3;
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public static final int FORMULA_TYPE_NAMEDRANGE = 4;
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private final String formulaString;
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private final int formulaLength;
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private int pointer;
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private ParseNode _rootNode;
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/**
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* Used for spotting if we have a cell reference,
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* or a named range
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*/
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private final static Pattern CELL_REFERENCE_PATTERN = Pattern.compile("(?:('?)[^:\\\\/\\?\\*\\[\\]]+\\1!)?\\$?[A-Za-z]+\\$?[\\d]+");
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private static char TAB = '\t';
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/**
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* Lookahead Character.
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* gets value '\0' when the input string is exhausted
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*/
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private char look;
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private HSSFWorkbook book;
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/**
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* Create the formula parser, with the string that is to be
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* parsed against the supplied workbook.
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* A later call the parse() method to return ptg list in
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* rpn order, then call the getRPNPtg() to retrive the
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* parse results.
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* This class is recommended only for single threaded use.
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*
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* If you only have a usermodel.HSSFWorkbook, and not a
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* model.Workbook, then use the convenience method on
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* usermodel.HSSFFormulaEvaluator
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*/
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public FormulaParser(String formula, HSSFWorkbook book){
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formulaString = formula;
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pointer=0;
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this.book = book;
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formulaLength = formulaString.length();
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}
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public static Ptg[] parse(String formula, HSSFWorkbook book) {
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FormulaParser fp = new FormulaParser(formula, book);
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fp.parse();
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return fp.getRPNPtg();
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}
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/** Read New Character From Input Stream */
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private void GetChar() {
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// Check to see if we've walked off the end of the string.
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if (pointer > formulaLength) {
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throw new RuntimeException("too far");
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}
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if (pointer < formulaLength) {
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look=formulaString.charAt(pointer);
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} else {
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// Just return if so and reset 'look' to something to keep
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// SkipWhitespace from spinning
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look = (char)0;
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}
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pointer++;
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//System.out.println("Got char: "+ look);
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}
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/** Report What Was Expected */
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private RuntimeException expected(String s) {
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String msg = "Parse error near char " + (pointer-1) + " '" + look + "'"
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+ " in specified formula '" + formulaString + "'. Expected "
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+ s;
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return new FormulaParseException(msg);
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}
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/** Recognize an Alpha Character */
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private boolean IsAlpha(char c) {
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return Character.isLetter(c) || c == '$' || c=='_';
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}
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/** Recognize a Decimal Digit */
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private boolean IsDigit(char c) {
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return Character.isDigit(c);
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}
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/** Recognize an Alphanumeric */
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private boolean IsAlNum(char c) {
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return (IsAlpha(c) || IsDigit(c));
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}
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/** Recognize White Space */
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private boolean IsWhite( char c) {
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return (c ==' ' || c== TAB);
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}
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/** Skip Over Leading White Space */
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private void SkipWhite() {
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while (IsWhite(look)) {
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GetChar();
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}
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}
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/**
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* Consumes the next input character if it is equal to the one specified otherwise throws an
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* unchecked exception. This method does <b>not</b> consume whitespace (before or after the
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* matched character).
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*/
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private void Match(char x) {
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if (look != x) {
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throw expected("'" + x + "'");
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}
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GetChar();
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}
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/** Get an Identifier */
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private String GetName() {
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StringBuffer Token = new StringBuffer();
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if (!IsAlpha(look) && look != '\'') {
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throw expected("Name");
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}
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if(look == '\'')
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{
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Match('\'');
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boolean done = look == '\'';
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while(!done)
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{
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Token.append(look);
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GetChar();
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if(look == '\'')
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{
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Match('\'');
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done = look != '\'';
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}
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}
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}
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else
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{
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while (IsAlNum(look)) {
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Token.append(look);
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GetChar();
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}
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}
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return Token.toString();
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}
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/** Get a Number */
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private String GetNum() {
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StringBuffer value = new StringBuffer();
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while (IsDigit(this.look)){
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value.append(this.look);
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GetChar();
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}
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return value.length() == 0 ? null : value.toString();
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}
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private ParseNode parseFunctionOrIdentifier() {
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String name = GetName();
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if (look == '('){
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//This is a function
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return function(name);
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}
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return new ParseNode(parseIdentifier(name));
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}
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private Ptg parseIdentifier(String name) {
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if (look == ':' || look == '.') { // this is a AreaReference
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GetChar();
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while (look == '.') { // formulas can have . or .. or ... instead of :
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GetChar();
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}
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String first = name;
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String second = GetName();
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return new AreaPtg(first+":"+second);
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}
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if (look == '!') {
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Match('!');
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String sheetName = name;
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String first = GetName();
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short externIdx = book.getExternalSheetIndex(book.getSheetIndex(sheetName));
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if (look == ':') {
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Match(':');
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String second=GetName();
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if (look == '!') {
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//The sheet name was included in both of the areas. Only really
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//need it once
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Match('!');
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String third=GetName();
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if (!sheetName.equals(second))
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throw new RuntimeException("Unhandled double sheet reference.");
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return new Area3DPtg(first+":"+third,externIdx);
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}
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return new Area3DPtg(first+":"+second,externIdx);
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}
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return new Ref3DPtg(first,externIdx);
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}
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if (name.equalsIgnoreCase("TRUE") || name.equalsIgnoreCase("FALSE")) {
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return new BoolPtg(name.toUpperCase());
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}
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// This can be either a cell ref or a named range
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// Try to spot which it is
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boolean cellRef = CELL_REFERENCE_PATTERN.matcher(name).matches();
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if (cellRef) {
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return new RefPtg(name);
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}
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for(int i = 0; i < book.getNumberOfNames(); i++) {
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// named range name matching is case insensitive
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if(book.getNameAt(i).getNameName().equalsIgnoreCase(name)) {
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return new NamePtg(name, book);
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}
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}
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throw new FormulaParseException("Found reference to named range \""
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+ name + "\", but that named range wasn't defined!");
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}
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/**
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* Note - Excel function names are 'case aware but not case sensitive'. This method may end
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* up creating a defined name record in the workbook if the specified name is not an internal
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* Excel function, and has not been encountered before.
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*
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* @param name case preserved function name (as it was entered/appeared in the formula).
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*/
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private ParseNode function(String name) {
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NamePtg nameToken = null;
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// Note regarding parameter -
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if(!AbstractFunctionPtg.isInternalFunctionName(name)) {
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// external functions get a Name token which points to a defined name record
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nameToken = new NamePtg(name, this.book);
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// in the token tree, the name is more or less the first argument
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}
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Match('(');
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ParseNode[] args = Arguments();
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Match(')');
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return getFunction(name, nameToken, args);
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}
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/**
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* Generates the variable function ptg for the formula.
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* <p>
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* For IF Formulas, additional PTGs are added to the tokens
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* @param name
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* @param numArgs
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* @return Ptg a null is returned if we're in an IF formula, it needs extreme manipulation and is handled in this function
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*/
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private ParseNode getFunction(String name, NamePtg namePtg, ParseNode[] args) {
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FunctionMetadata fm = FunctionMetadataRegistry.getFunctionByName(name.toUpperCase());
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int numArgs = args.length;
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if(fm == null) {
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if (namePtg == null) {
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throw new IllegalStateException("NamePtg must be supplied for external functions");
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}
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// must be external function
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ParseNode[] allArgs = new ParseNode[numArgs+1];
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allArgs[0] = new ParseNode(namePtg);
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System.arraycopy(args, 0, allArgs, 1, numArgs);
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return new ParseNode(new FuncVarPtg(name, (byte)(numArgs+1)), allArgs);
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}
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if (namePtg != null) {
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throw new IllegalStateException("NamePtg no applicable to internal functions");
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}
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boolean isVarArgs = !fm.hasFixedArgsLength();
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int funcIx = fm.getIndex();
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validateNumArgs(args.length, fm);
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AbstractFunctionPtg retval;
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if(isVarArgs) {
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retval = new FuncVarPtg(name, (byte)numArgs);
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} else {
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retval = new FuncPtg(funcIx);
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}
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return new ParseNode(retval, args);
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}
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private void validateNumArgs(int numArgs, FunctionMetadata fm) {
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if(numArgs < fm.getMinParams()) {
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String msg = "Too few arguments to function '" + fm.getName() + "'. ";
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if(fm.hasFixedArgsLength()) {
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msg += "Expected " + fm.getMinParams();
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} else {
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msg += "At least " + fm.getMinParams() + " were expected";
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}
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msg += " but got " + numArgs + ".";
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throw new FormulaParseException(msg);
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}
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if(numArgs > fm.getMaxParams()) {
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String msg = "Too many arguments to function '" + fm.getName() + "'. ";
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if(fm.hasFixedArgsLength()) {
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msg += "Expected " + fm.getMaxParams();
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} else {
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msg += "At most " + fm.getMaxParams() + " were expected";
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}
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msg += " but got " + numArgs + ".";
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throw new FormulaParseException(msg);
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}
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}
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private static boolean isArgumentDelimiter(char ch) {
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return ch == ',' || ch == ')';
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}
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/** get arguments to a function */
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private ParseNode[] Arguments() {
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//average 2 args per function
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List temp = new ArrayList(2);
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SkipWhite();
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if(look == ')') {
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return ParseNode.EMPTY_ARRAY;
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}
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boolean missedPrevArg = true;
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int numArgs = 0;
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while (true) {
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SkipWhite();
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if (isArgumentDelimiter(look)) {
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if (missedPrevArg) {
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temp.add(new ParseNode(MissingArgPtg.instance));
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numArgs++;
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}
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if (look == ')') {
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break;
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}
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Match(',');
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missedPrevArg = true;
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continue;
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}
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temp.add(comparisonExpression());
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numArgs++;
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missedPrevArg = false;
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SkipWhite();
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if (!isArgumentDelimiter(look)) {
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throw expected("',' or ')'");
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}
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}
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ParseNode[] result = new ParseNode[temp.size()];
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temp.toArray(result);
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return result;
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}
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/** Parse and Translate a Math Factor */
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private ParseNode powerFactor() {
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ParseNode result = percentFactor();
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while(true) {
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SkipWhite();
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if(look != '^') {
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return result;
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}
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Match('^');
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ParseNode other = percentFactor();
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result = new ParseNode(PowerPtg.instance, result, other);
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}
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}
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private ParseNode percentFactor() {
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ParseNode result = parseSimpleFactor();
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while(true) {
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SkipWhite();
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if(look != '%') {
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return result;
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}
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Match('%');
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result = new ParseNode(PercentPtg.instance, result);
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}
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}
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/**
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* factors (without ^ or % )
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*/
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private ParseNode parseSimpleFactor() {
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SkipWhite();
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switch(look) {
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case '#':
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return new ParseNode(parseErrorLiteral());
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case '-':
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Match('-');
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return new ParseNode(UnaryMinusPtg.instance, powerFactor());
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case '+':
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Match('+');
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return new ParseNode(UnaryPlusPtg.instance, powerFactor());
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case '(':
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Match('(');
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ParseNode inside = comparisonExpression();
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Match(')');
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return new ParseNode(ParenthesisPtg.instance, inside);
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case '"':
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return new ParseNode(parseStringLiteral());
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}
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if (IsAlpha(look) || look == '\''){
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return parseFunctionOrIdentifier();
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}
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// else - assume number
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return new ParseNode(parseNumber());
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}
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private Ptg parseNumber() {
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String number2 = null;
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String exponent = null;
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String number1 = GetNum();
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if (look == '.') {
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GetChar();
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number2 = GetNum();
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}
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if (look == 'E') {
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GetChar();
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String sign = "";
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if (look == '+') {
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GetChar();
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} else if (look == '-') {
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GetChar();
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sign = "-";
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}
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String number = GetNum();
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if (number == null) {
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throw expected("Integer");
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}
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exponent = sign + number;
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}
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if (number1 == null && number2 == null) {
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throw expected("Integer");
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}
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return getNumberPtgFromString(number1, number2, exponent);
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}
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private ErrPtg parseErrorLiteral() {
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Match('#');
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String part1 = GetName().toUpperCase();
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switch(part1.charAt(0)) {
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case 'V':
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if(part1.equals("VALUE")) {
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Match('!');
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return ErrPtg.VALUE_INVALID;
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}
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throw expected("#VALUE!");
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case 'R':
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if(part1.equals("REF")) {
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Match('!');
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return ErrPtg.REF_INVALID;
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}
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throw expected("#REF!");
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case 'D':
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if(part1.equals("DIV")) {
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Match('/');
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Match('0');
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Match('!');
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return ErrPtg.DIV_ZERO;
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}
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throw expected("#DIV/0!");
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case 'N':
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if(part1.equals("NAME")) {
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Match('?'); // only one that ends in '?'
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return ErrPtg.NAME_INVALID;
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}
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if(part1.equals("NUM")) {
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Match('!');
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return ErrPtg.NUM_ERROR;
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}
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if(part1.equals("NULL")) {
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Match('!');
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return ErrPtg.NULL_INTERSECTION;
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}
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if(part1.equals("N")) {
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Match('/');
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if(look != 'A' && look != 'a') {
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throw expected("#N/A");
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}
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Match(look);
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// Note - no '!' or '?' suffix
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return ErrPtg.N_A;
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}
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throw expected("#NAME?, #NUM!, #NULL! or #N/A");
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}
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throw expected("#VALUE!, #REF!, #DIV/0!, #NAME?, #NUM!, #NULL! or #N/A");
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}
|
|
|
|
|
|
/**
|
|
* Get a PTG for an integer from its string representation.
|
|
* return Int or Number Ptg based on size of input
|
|
*/
|
|
private static Ptg getNumberPtgFromString(String number1, String number2, String exponent) {
|
|
StringBuffer number = new StringBuffer();
|
|
|
|
if (number2 == null) {
|
|
number.append(number1);
|
|
|
|
if (exponent != null) {
|
|
number.append('E');
|
|
number.append(exponent);
|
|
}
|
|
|
|
String numberStr = number.toString();
|
|
int intVal;
|
|
try {
|
|
intVal = Integer.parseInt(numberStr);
|
|
} catch (NumberFormatException e) {
|
|
return new NumberPtg(numberStr);
|
|
}
|
|
if (IntPtg.isInRange(intVal)) {
|
|
return new IntPtg(intVal);
|
|
}
|
|
return new NumberPtg(numberStr);
|
|
}
|
|
|
|
if (number1 != null) {
|
|
number.append(number1);
|
|
}
|
|
|
|
number.append('.');
|
|
number.append(number2);
|
|
|
|
if (exponent != null) {
|
|
number.append('E');
|
|
number.append(exponent);
|
|
}
|
|
|
|
return new NumberPtg(number.toString());
|
|
}
|
|
|
|
|
|
private StringPtg parseStringLiteral() {
|
|
Match('"');
|
|
|
|
StringBuffer token = new StringBuffer();
|
|
while (true) {
|
|
if (look == '"') {
|
|
GetChar();
|
|
if (look != '"') {
|
|
break;
|
|
}
|
|
}
|
|
token.append(look);
|
|
GetChar();
|
|
}
|
|
return new StringPtg(token.toString());
|
|
}
|
|
|
|
/** Parse and Translate a Math Term */
|
|
private ParseNode Term() {
|
|
ParseNode result = powerFactor();
|
|
while(true) {
|
|
SkipWhite();
|
|
Ptg operator;
|
|
switch(look) {
|
|
case '*':
|
|
Match('*');
|
|
operator = MultiplyPtg.instance;
|
|
break;
|
|
case '/':
|
|
Match('/');
|
|
operator = DividePtg.instance;
|
|
break;
|
|
default:
|
|
return result; // finished with Term
|
|
}
|
|
ParseNode other = powerFactor();
|
|
result = new ParseNode(operator, result, other);
|
|
}
|
|
}
|
|
|
|
private ParseNode comparisonExpression() {
|
|
ParseNode result = concatExpression();
|
|
while (true) {
|
|
SkipWhite();
|
|
switch(look) {
|
|
case '=':
|
|
case '>':
|
|
case '<':
|
|
Ptg comparisonToken = getComparisonToken();
|
|
ParseNode other = concatExpression();
|
|
result = new ParseNode(comparisonToken, result, other);
|
|
continue;
|
|
}
|
|
return result; // finished with predicate expression
|
|
}
|
|
}
|
|
|
|
private Ptg getComparisonToken() {
|
|
if(look == '=') {
|
|
Match(look);
|
|
return EqualPtg.instance;
|
|
}
|
|
boolean isGreater = look == '>';
|
|
Match(look);
|
|
if(isGreater) {
|
|
if(look == '=') {
|
|
Match('=');
|
|
return GreaterEqualPtg.instance;
|
|
}
|
|
return GreaterThanPtg.instance;
|
|
}
|
|
switch(look) {
|
|
case '=':
|
|
Match('=');
|
|
return LessEqualPtg.instance;
|
|
case '>':
|
|
Match('>');
|
|
return NotEqualPtg.instance;
|
|
}
|
|
return LessThanPtg.instance;
|
|
}
|
|
|
|
|
|
private ParseNode concatExpression() {
|
|
ParseNode result = additiveExpression();
|
|
while (true) {
|
|
SkipWhite();
|
|
if(look != '&') {
|
|
break; // finished with concat expression
|
|
}
|
|
Match('&');
|
|
ParseNode other = additiveExpression();
|
|
result = new ParseNode(ConcatPtg.instance, result, other);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
/** Parse and Translate an Expression */
|
|
private ParseNode additiveExpression() {
|
|
ParseNode result = Term();
|
|
while (true) {
|
|
SkipWhite();
|
|
Ptg operator;
|
|
switch(look) {
|
|
case '+':
|
|
Match('+');
|
|
operator = AddPtg.instance;
|
|
break;
|
|
case '-':
|
|
Match('-');
|
|
operator = SubtractPtg.instance;
|
|
break;
|
|
default:
|
|
return result; // finished with additive expression
|
|
}
|
|
ParseNode other = Term();
|
|
result = new ParseNode(operator, result, other);
|
|
}
|
|
}
|
|
|
|
//{--------------------------------------------------------------}
|
|
//{ Parse and Translate an Assignment Statement }
|
|
/**
|
|
procedure Assignment;
|
|
var Name: string[8];
|
|
begin
|
|
Name := GetName;
|
|
Match('=');
|
|
Expression;
|
|
|
|
end;
|
|
**/
|
|
|
|
|
|
/**
|
|
* API call to execute the parsing of the formula
|
|
* @deprecated use Ptg[] FormulaParser.parse(String, HSSFWorkbook) directly
|
|
*/
|
|
public void parse() {
|
|
pointer=0;
|
|
GetChar();
|
|
_rootNode = comparisonExpression();
|
|
|
|
if(pointer <= formulaLength) {
|
|
String msg = "Unused input [" + formulaString.substring(pointer-1)
|
|
+ "] after attempting to parse the formula [" + formulaString + "]";
|
|
throw new FormulaParseException(msg);
|
|
}
|
|
}
|
|
|
|
|
|
/*********************************
|
|
* PARSER IMPLEMENTATION ENDS HERE
|
|
* EXCEL SPECIFIC METHODS BELOW
|
|
*******************************/
|
|
|
|
/** API call to retrive the array of Ptgs created as
|
|
* a result of the parsing
|
|
*/
|
|
public Ptg[] getRPNPtg() {
|
|
return getRPNPtg(FORMULA_TYPE_CELL);
|
|
}
|
|
|
|
public Ptg[] getRPNPtg(int formulaType) {
|
|
OperandClassTransformer oct = new OperandClassTransformer(formulaType);
|
|
// RVA is for 'operand class': 'reference', 'value', 'array'
|
|
oct.transformFormula(_rootNode);
|
|
return ParseNode.toTokenArray(_rootNode);
|
|
}
|
|
|
|
/**
|
|
* Convenience method which takes in a list then passes it to the
|
|
* other toFormulaString signature.
|
|
* @param book workbook for 3D and named references
|
|
* @param lptgs list of Ptg, can be null or empty
|
|
* @return a human readable String
|
|
*/
|
|
public static String toFormulaString(HSSFWorkbook book, List lptgs) {
|
|
String retval = null;
|
|
if (lptgs == null || lptgs.size() == 0) return "#NAME";
|
|
Ptg[] ptgs = new Ptg[lptgs.size()];
|
|
ptgs = (Ptg[])lptgs.toArray(ptgs);
|
|
retval = toFormulaString(book, ptgs);
|
|
return retval;
|
|
}
|
|
/**
|
|
* Convenience method which takes in a list then passes it to the
|
|
* other toFormulaString signature. Works on the current
|
|
* workbook for 3D and named references
|
|
* @param lptgs list of Ptg, can be null or empty
|
|
* @return a human readable String
|
|
*/
|
|
public String toFormulaString(List lptgs) {
|
|
return toFormulaString(book, lptgs);
|
|
}
|
|
|
|
/**
|
|
* Static method to convert an array of Ptgs in RPN order
|
|
* to a human readable string format in infix mode.
|
|
* @param book workbook for named and 3D references
|
|
* @param ptgs array of Ptg, can be null or empty
|
|
* @return a human readable String
|
|
*/
|
|
public static String toFormulaString(HSSFWorkbook book, Ptg[] ptgs) {
|
|
if (ptgs == null || ptgs.length == 0) {
|
|
// TODO - what is the justification for returning "#NAME" (which is not "#NAME?", btw)
|
|
return "#NAME";
|
|
}
|
|
Stack stack = new Stack();
|
|
|
|
for (int i=0 ; i < ptgs.length; i++) {
|
|
Ptg ptg = ptgs[i];
|
|
// TODO - what about MemNoMemPtg?
|
|
if(ptg instanceof MemAreaPtg || ptg instanceof MemFuncPtg || ptg instanceof MemErrPtg) {
|
|
// marks the start of a list of area expressions which will be naturally combined
|
|
// by their trailing operators (e.g. UnionPtg)
|
|
// TODO - put comment and throw exception in toFormulaString() of these classes
|
|
continue;
|
|
}
|
|
if (ptg instanceof ParenthesisPtg) {
|
|
String contents = (String)stack.pop();
|
|
stack.push ("(" + contents + ")");
|
|
continue;
|
|
}
|
|
if (ptg instanceof AttrPtg) {
|
|
AttrPtg attrPtg = ((AttrPtg) ptg);
|
|
if (attrPtg.isOptimizedIf() || attrPtg.isOptimizedChoose() || attrPtg.isGoto()) {
|
|
continue;
|
|
}
|
|
if (attrPtg.isSpace()) {
|
|
// POI currently doesn't render spaces in formulas
|
|
continue;
|
|
// but if it ever did, care must be taken:
|
|
// tAttrSpace comes *before* the operand it applies to, which may be consistent
|
|
// with how the formula text appears but is against the RPN ordering assumed here
|
|
}
|
|
if (attrPtg.isSemiVolatile()) {
|
|
// similar to tAttrSpace - RPN is violated
|
|
continue;
|
|
}
|
|
if (attrPtg.isSum()) {
|
|
String[] operands = getOperands(stack, attrPtg.getNumberOfOperands());
|
|
stack.push(attrPtg.toFormulaString(operands));
|
|
continue;
|
|
}
|
|
throw new RuntimeException("Unexpected tAttr: " + attrPtg.toString());
|
|
}
|
|
|
|
if (! (ptg instanceof OperationPtg)) {
|
|
stack.push(ptg.toFormulaString(book));
|
|
continue;
|
|
}
|
|
|
|
OperationPtg o = (OperationPtg) ptg;
|
|
String[] operands = getOperands(stack, o.getNumberOfOperands());
|
|
stack.push(o.toFormulaString(operands));
|
|
}
|
|
if(stack.isEmpty()) {
|
|
// inspection of the code above reveals that every stack.pop() is followed by a
|
|
// stack.push(). So this is either an internal error or impossible.
|
|
throw new IllegalStateException("Stack underflow");
|
|
}
|
|
String result = (String) stack.pop();
|
|
if(!stack.isEmpty()) {
|
|
// Might be caused by some tokens like AttrPtg and Mem*Ptg, which really shouldn't
|
|
// put anything on the stack
|
|
throw new IllegalStateException("too much stuff left on the stack");
|
|
}
|
|
return result;
|
|
}
|
|
|
|
private static String[] getOperands(Stack stack, int nOperands) {
|
|
String[] operands = new String[nOperands];
|
|
|
|
for (int j = nOperands-1; j >= 0; j--) { // reverse iteration because args were pushed in-order
|
|
if(stack.isEmpty()) {
|
|
String msg = "Too few arguments supplied to operation. Expected (" + nOperands
|
|
+ ") operands but got (" + (nOperands - j - 1) + ")";
|
|
throw new IllegalStateException(msg);
|
|
}
|
|
operands[j] = (String) stack.pop();
|
|
}
|
|
return operands;
|
|
}
|
|
/**
|
|
* Static method to convert an array of Ptgs in RPN order
|
|
* to a human readable string format in infix mode. Works
|
|
* on the current workbook for named and 3D references.
|
|
* @param ptgs array of Ptg, can be null or empty
|
|
* @return a human readable String
|
|
*/
|
|
public String toFormulaString(Ptg[] ptgs) {
|
|
return toFormulaString(book, ptgs);
|
|
}
|
|
}
|