jxl.biff.formula
Class StringFormulaParser

java.lang.Object
  |
  +--jxl.biff.formula.StringFormulaParser

All Implemented Interfaces:

Parser

class StringFormulaParser

extends java.lang.Object

implements Parser

Parses a string formula into a parse tree

Field Summary

private java.util.Stack	arguments The stack argument used when parsing a function in order to pass multiple arguments back to the calling method
private ExternalSheet	externalSheet A handle to the external sheet
private java.lang.String	formula The formula string passed to this object
private java.lang.String	parsedFormula The parsed formula string, as retrieved from the parse tree
private ParseItem	root The parse tree
private WorkbookSettings	settings The workbook settings

Constructor Summary

StringFormulaParser(java.lang.String f, ExternalSheet es, WorkbookSettings ws)
Constructor

Method Summary

byte[]	getBytes() Gets the bytes for the formula
java.lang.String	getFormula() Gets the formula as a string.
private java.util.ArrayList	getTokens() Gets the list of lexical tokens using the generated lexical analyzer
private void	handleFunction(StringFunction sf, java.util.Iterator i, java.util.Stack stack) Handles the case when parsing a string when a token is a function
void	parse() Parses the list of tokens
private ParseItem	parseCurrent(java.util.Iterator i) Recursively parses the token array.

Methods inherited from class java.lang.Object

, clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, toString, wait, wait, wait

Field Detail

formula

private java.lang.String formula

The formula string passed to this object

parsedFormula

private java.lang.String parsedFormula

The parsed formula string, as retrieved from the parse tree

root

private ParseItem root

The parse tree

arguments

private java.util.Stack arguments

The stack argument used when parsing a function in order to pass multiple arguments back to the calling method

settings

private WorkbookSettings settings

The workbook settings

externalSheet

private ExternalSheet externalSheet

A handle to the external sheet

Constructor Detail

StringFormulaParser

public StringFormulaParser(java.lang.String f,
                           ExternalSheet es,
                           WorkbookSettings ws)

Constructor

Parameters:

f -

ws -

Method Detail

parse

public void parse()
           throws FormulaException

Parses the list of tokens

Specified by:

parse in interface Parser

Throws:

FormulaException -

parseCurrent

private ParseItem parseCurrent(java.util.Iterator i)
                        throws FormulaException

Recursively parses the token array. Recursion is used in order to evaluate parentheses and function arguments

Parameters:

i - an iterator of tokens

Returns:

the root node of the current parse stack

Throws:

FormulaException - if an error occurs

getTokens

private java.util.ArrayList getTokens()
                               throws FormulaException

Gets the list of lexical tokens using the generated lexical analyzer

Returns:

the list of tokens

Throws:

FormulaException - if an error occurs

getFormula

public java.lang.String getFormula()

Gets the formula as a string. Uses the parse tree to do this, and does not simply return whatever string was passed in

Specified by:

getFormula in interface Parser

Following copied from interface: jxl.biff.formula.Parser

Returns:

the formula as a string

getBytes

public byte[] getBytes()

Gets the bytes for the formula

Specified by:

getBytes in interface Parser

Returns:

the bytes in RPN

handleFunction

private void handleFunction(StringFunction sf,
                            java.util.Iterator i,
                            java.util.Stack stack)
                     throws FormulaException

Handles the case when parsing a string when a token is a function

Parameters:

sf - the string function

i - the token iterator

stack - the parse tree stack

Throws:

FormulaException - if an error occurs