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Go Language Microsoft Excel™ Formula Parser

Home Page: https://xuri.me/excelize

License: BSD 3-Clause "New" or "Revised" License

Go 100.00%

excel formula parser golang formula-parser ast spreadsheet excelize efp go

efp's Introduction

EFP (Excel Formula Parser)

Using EFP (Excel Formula Parser) you can get an Abstract Syntax Tree (AST) from Excel formula.

Installation

go get github.com/xuri/efp

Example

package main

import "github.com/xuri/efp"

func main() {
    ps := efp.ExcelParser()
    ps.Parse("=SUM(A3+B9*2)/2")
    println(ps.PrettyPrint())
}

Get AST

SUM <Function> <Start>
    A3 <Operand> <Range>
    + <OperatorInfix> <Math>
    B9 <Operand> <Range>
    * <OperatorInfix> <Math>
    2 <Operand> <Number>
 <Function> <Stop>
/ <OperatorInfix> <Math>
2 <Operand> <Number>

Contributing

Contributions are welcome! Open a pull request to fix a bug, or open an issue to discuss a new feature or change.

Credits

EFP (Excel Formula Parser) is a Go language port of E. W. Bachtal's Excel formula parser.

Licenses

This program is under the terms of the BSD 3-Clause License. See https://opensource.org/licenses/BSD-3-Clause.

efp's People

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efp's Issues

Is anyone using another package to evaluate these AST's?

Given the below example:

SUM <Function> <Start>
    A3 <Operand> <Range>
    + <OperatorInfix> <Math>
    B9 <Operand> <Range>
    * <OperatorInfix> <Math>
    2 <Operand> <Number>
 <Function> <Stop>
/ <OperatorInfix> <Math>
2 <Operand> <Number>

How do you evaluate the expression? And if you don't evaluate it, what do you use the AST for?

operator precedence may need to be consider

Description

For example: 1 + 10 / 2 will calculate / first, then +, so the result should be 6, this would better be solved at parsing stage.

Regional settings / Language support

I think the delimiter should be configurable. Currently I think you use a comma but in some other languages it is e.g. a ";". What do you think? Awesome project by the way - was going to start the same in the next few weeks.

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