csheets.core.formula.compiler
Class ExcelExpressionCompiler

java.lang.Object
  csheets.core.formula.compiler.ExcelExpressionCompiler

All Implemented Interfaces:

ExpressionCompiler

public class ExcelExpressionCompiler
extends Object
implements ExpressionCompiler

A compiler that generates Excel-style formulas from strings.

Author:

Einar Pehrson

Field Summary

static char

FORMULA_STARTER The character that signals that a cell's content is a formula ('=')

Constructor Summary

ExcelExpressionCompiler()
Creates the Excel expression compiler.

Method Summary

Expression	compile(Cell cell, String source) Compiles an expression from the given string.
protected Expression	convert(Cell cell, antlr.collections.AST node) Converts the given ANTLR AST to an expression.
char	getStarter()

Methods inherited from class java.lang.Object

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

Field Detail

FORMULA_STARTER

public static final char FORMULA_STARTER

The character that signals that a cell's content is a formula ('=')

See Also:

Constant Field Values

Constructor Detail

ExcelExpressionCompiler

public ExcelExpressionCompiler()

Creates the Excel expression compiler.

Method Detail

getStarter

public char getStarter()

Specified by:

getStarter in interface ExpressionCompiler

Returns:

the

compile

public Expression compile(Cell cell,
                          String source)
                   throws FormulaCompilationException

Description copied from interface: ExpressionCompiler

Compiles an expression from the given string.

Specified by:

compile in interface ExpressionCompiler

Parameters:

cell - the cell for which the expression is to be compiled

source - a string representing the expression to be compiled

Returns:

the compiled expression

Throws:

FormulaCompilationException - if the expression could not be compiled

convert

protected Expression convert(Cell cell,
                             antlr.collections.AST node)
                      throws FormulaCompilationException

Converts the given ANTLR AST to an expression.

Parameters:

node - the abstract syntax tree node to convert

Returns:

the result of the conversion

Throws:

FormulaCompilationException