org.apache.poi.ss.formula

Class FormulaParser

java.lang.Object

org.apache.poi.ss.formula.FormulaParser

@Internal
public final class FormulaParser
extends java.lang.Object

This class parses a formula string into a List of tokens in RPN order. Inspired by "Lets Build a Compiler" by Jack Crenshaw BNF for the formula expression is :

 <expression> ::= <term> [<addop> <term>]*
 <term> ::= <factor>  [ <mulop> <factor> ]*
 <factor> ::= <number> | (<expression>) | <cellRef> | <function>
 <function> ::= <functionName> ([expression [, expression]*])
 

For POI internal use only

Method Summary

Modifier and Type	Method and Description
static Ptg[]	parse(java.lang.String formula, FormulaParsingWorkbook workbook, FormulaType formulaType, int sheetIndex) Parse a formula into an array of tokens Side effect: creates name (Workbook.createName()) if formula contains unrecognized names (names are likely UDFs)
static Ptg[]	parse(java.lang.String formula, FormulaParsingWorkbook workbook, FormulaType formulaType, int sheetIndex, int rowIndex) Parse a formula into an array of tokens Side effect: creates name (Workbook.createName()) if formula contains unrecognized names (names are likely UDFs)
static Area3DPxg	parseStructuredReference(java.lang.String tableText, FormulaParsingWorkbook workbook, int rowIndex) Parse a structured reference.

Methods inherited from class java.lang.Object

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

Method Detail

parse

public static Ptg[] parse(java.lang.String formula,
                          FormulaParsingWorkbook workbook,
                          FormulaType formulaType,
                          int sheetIndex,
                          int rowIndex)

Parse a formula into an array of tokens Side effect: creates name (Workbook.createName()) if formula contains unrecognized names (names are likely UDFs)

Parameters:

formula - the formula to parse

workbook - the parent workbook

formulaType - the type of the formula

sheetIndex - the 0-based index of the sheet this formula belongs to. The sheet index is required to resolve sheet-level names. -1 means that the scope of the name will be ignored and the parser will match names only by name

rowIndex - - the related cell's row index in 0-based form (-1 if the formula is not cell related) used to handle structured references that have the "#This Row" quantifier. Use rowIndex=-1 or parseStructuredReference(String, FormulaParsingWorkbook, int) if formula does not contain structured references.

Returns:

array of parsed tokens

Throws:

FormulaParseException - if the formula has incorrect syntax or is otherwise invalid

parse

public static Ptg[] parse(java.lang.String formula,
                          FormulaParsingWorkbook workbook,
                          FormulaType formulaType,
                          int sheetIndex)

Parse a formula into an array of tokens Side effect: creates name (Workbook.createName()) if formula contains unrecognized names (names are likely UDFs)

Parameters:

formula - the formula to parse

workbook - the parent workbook

formulaType - the type of the formula

sheetIndex - the 0-based index of the sheet this formula belongs to. The sheet index is required to resolve sheet-level names. -1 means that the scope of the name will be ignored and the parser will match names only by name

Returns:

array of parsed tokens

Throws:

FormulaParseException - if the formula has incorrect syntax or is otherwise invalid

parseStructuredReference

public static Area3DPxg parseStructuredReference(java.lang.String tableText,
                                                 FormulaParsingWorkbook workbook,
                                                 int rowIndex)

Parse a structured reference. Converts the structured reference to the area that represent it.

Parameters:

tableText - - The structured reference text

workbook - - the parent workbook

rowIndex - - the 0-based cell's row index ( used to handle "#This Row" quantifiers )

Returns:

the area that being represented by the structured reference.