XLFormula Engine

XLFormula Engine is a Rust crate for parsing and evaluating Excel formulas. It currently works with f32 types.

Features

It supports:

• Any numbers, negative and positive, as float or integer;
• Arithmetic operations +, -, /, *, ^;
• Logical operations AND(), OR(), NOT(), XOR();
• Comparison operations =, >, >=, <, <=, <>;
• String operation & (concatenation);
• Build-in variables TRUE, FALSE;
• Excel functions ABS(), SUM(), PRODUCT().

Installation

Add the corresponding entry to your Cargo.toml dependency list: toml [dependencies] xlformula_engine = "0.1.0" and add this to your crate root: rust extern crate xlformula_engine;

Examples

Here are simple examples of parsing an Excel formula string and evaluating to a result: ```rust extern crate xlformulaengine; use xlformulaengine::calculate; use xlformulaengine::parseformula;

fn main() { let formula = parseformula::parsestringtoformula(&"=1+2"); let result = calculate::calculateformula(formula, None); println!("Result is {}", calculate::resultto_string(result));

let formula = parse_formula::parse_string_to_formula(&"=(1*(2+3))*2");
let result = calculate::calculate_formula(formula, None);
println!("Result is {}", calculate::result_to_string(result));

let formula = parse_formula::parse_string_to_formula(&"=1+3/0"); // error (#DIV/0!)
let result = calculate::calculate_formula(formula, None);
println!("Result is {}", calculate::result_to_string(result));

} ``` The last string is evaluated to #DIV/0!.

Concatenating strings: ```rust extern crate xlformulaengine; use xlformulaengine::calculate; use xlformulaengine::parseformula;

fn main() { let formula = parseformula::parsestringtoformula(&"=\"Hello \" & \" World!\""); let result = calculate::calculateformula(formula, None); println!("Result is {}", calculate::resultto_string(result));

let formula = parse_formula::parse_string_to_formula(&"=1 + \"Hello\""); // error (#CAST!)
let result = calculate::calculate_formula(formula, None);
println!("Result is {}", calculate::result_to_string(result));

} ``` Concatenating number and string results in a #CAST! error.

Constants ( i.e. a string without '=' ): ```rust extern crate xlformulaengine; use xlformulaengine::calculate; use xlformulaengine::parseformula;

fn main() { let formula = parseformula::parsestringtoformula(&"1.2"); let result = calculate::calculateformula(formula, None); println!("Result is {}", calculate::resultto_string(result));

let formula = parse_formula::parse_string_to_formula(&"Hello World");
let result = calculate::calculate_formula(formula, None);
println!("Result is {}", calculate::result_to_string(result));

} ```

Excel functions: ```rust extern crate xlformulaengine; use xlformulaengine::calculate; use xlformulaengine::parseformula;

fn main() { let formula = parseformula::parsestringtoformula(&"=ABS(-1)"); let result = calculate::calculateformula(formula, None); println!("Result is {}", calculate::resultto_string(result));

let formula = parse_formula::parse_string_to_formula(&"=SUM(1,2,\"3\")");
let result = calculate::calculate_formula(formula, None);
println!("Result is {}", calculate::result_to_string(result)); 

let formula = parse_formula::parse_string_to_formula(&"=PRODUCT(ABS(1),2*1, 3,4*1)");
let result = calculate::calculate_formula(formula, None);
println!("Result is {}", calculate::result_to_string(result));

} ```

Logical expressions: ```rust extern crate xlformulaengine; use xlformulaengine::calculate; use xlformulaengine::parseformula;

fn main() { let formula = parseformula::parsestringtoformula(&"=2>=1"); let result = calculate::calculateformula(formula, None); println!("Result is {}", calculate::resultto_string(result));

let formula = parse_formula::parse_string_to_formula(&"=OR(1>1,1<>1)");
let result = calculate::calculate_formula(formula, None);
println!("Result is {}", calculate::result_to_string(result)); 

let formula = parse_formula::parse_string_to_formula(&"=AND(\"test\",\"True\", 1, true) ");
let result = calculate::calculate_formula(formula, None);
println!("Result is {}", calculate::result_to_string(result));

} ```

References: ```rust extern crate xlformulaengine; use xlformulaengine::calculate; use xlformulaengine::parseformula; use xlformula_engine::types;

fn main() { let datafunction = |s: String| match s.asstr() { "A" => types::Value::Text("=1+B".tostring()), "B" => types::Value::Number(3.0), _ => types::Value::Error(types::Error::Value), }; let formula = parseformula::parsestringtoformula(&"=A+B"); let result = calculate::calculateformula(formula, Some(datafunction)); println!("Result is {}", calculate::resultto_string(result)); } ```

License

Licensed under MIT License (see the LICENSE file for the full text).

Contact

Please feel free to contact us at jirada.herbst@data2impact.com.