Crate xlformula_engine[][src]

Expand description

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(), AVERAGE(), RIGHT(), LEFT(), IF()
  • Operations on lists of values (one dimensional range)
  • Add or subtract dates and excel funtion DAYS()
  • Custom functions with number arguments
  • Handle blank/null values in calculation
  • Handle empty/missing parameters of function calls as blank values

Installation

Add the corresponding entry to your Cargo.toml dependency list:

[dependencies]
xlformula_engine = "0.1.16"

and add this to your crate root:

extern crate xlformula_engine;

Examples

Here are simple examples of parsing an Excel formula string and evaluating to a result:

extern crate xlformula_engine;
use xlformula_engine::calculate;
use xlformula_engine::parse_formula;
use xlformula_engine::NoReference;
use xlformula_engine::NoCustomFunction;

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

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

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

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

Concatenating strings:

extern crate xlformula_engine;
use xlformula_engine::calculate;
use xlformula_engine::parse_formula;
use xlformula_engine::NoReference;
use xlformula_engine::NoCustomFunction;

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

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

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

Constants ( i.e. a string without ‘=’ ):

extern crate xlformula_engine;
use xlformula_engine::calculate;
use xlformula_engine::parse_formula;
use xlformula_engine::NoReference;
use xlformula_engine::NoCustomFunction;

let formula = parse_formula::parse_string_to_formula(&"1.2", None::<NoCustomFunction>);
let result = calculate::calculate_formula(formula, None::<NoReference>);
println!("Result is {}", calculate::result_to_string(result));

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

Excel functions:

extern crate xlformula_engine;
use xlformula_engine::calculate;
use xlformula_engine::parse_formula;
use xlformula_engine::NoReference;
use xlformula_engine::NoCustomFunction;

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

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

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

let formula = parse_formula::parse_string_to_formula(&"=RIGHT(\"apple\", 3)", None::<NoCustomFunction>);
let result = calculate::calculate_formula(formula, None::<NoReference>);
println!("Result is {}", calculate::result_to_string(result));

let formula = parse_formula::parse_string_to_formula(&"=LEFT(\"apple\", 3)", None::<NoCustomFunction>);
let result = calculate::calculate_formula(formula, None::<NoReference>);
println!("Result is {}", calculate::result_to_string(result));

let formula = parse_formula::parse_string_to_formula(&"=LEFT(\"apple\")", None::<NoCustomFunction>);
let result = calculate::calculate_formula(formula, None::<NoReference>);
println!("Result is {}", calculate::result_to_string(result));

let formula = parse_formula::parse_string_to_formula(&"=IF(TRUE,1,0)", None::<NoCustomFunction>);
let result = calculate::calculate_formula(formula, None::<NoReference>);
println!("Result is {}", calculate::result_to_string(result));

Logical expressions:

extern crate xlformula_engine;
use xlformula_engine::calculate;
use xlformula_engine::parse_formula;
use xlformula_engine::NoReference;
use xlformula_engine::NoCustomFunction;

let formula = parse_formula::parse_string_to_formula(&"=2>=1", None::<NoCustomFunction>);
let result = calculate::calculate_formula(formula, None::<NoReference>);
println!("Result is {}", calculate::result_to_string(result));

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

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

References:

extern crate xlformula_engine;
use xlformula_engine::calculate;
use xlformula_engine::parse_formula;
use xlformula_engine::types;
use xlformula_engine::NoCustomFunction;

let data_function = |s: String| match s.as_str() {
"A" => types::Value::Text("=1+B".to_string()),
"B" => types::Value::Number(3.0),
_ => types::Value::Error(types::Error::Value),
};
let formula = parse_formula::parse_string_to_formula(&"=A+B", None::<NoCustomFunction>);
let result = calculate::calculate_formula(formula, Some(&data_function));
println!("Result is {}", calculate::result_to_string(result));

List:

extern crate xlformula_engine;
use xlformula_engine::calculate;
use xlformula_engine::parse_formula;
use xlformula_engine::NoReference;
use xlformula_engine::NoCustomFunction;

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

let formula = parse_formula::parse_string_to_formula(&"=XOR({0,0,0})", None::<NoCustomFunction>);
let result = calculate::calculate_formula(formula, None::<NoReference>);
println!("Result is {}", calculate::result_to_string(result));

let formula = parse_formula::parse_string_to_formula(&"=AVERAGE({1,2,3},1,2,3)", None::<NoCustomFunction>);
let result = calculate::calculate_formula(formula, None::<NoReference>);
println!("Result is {}", calculate::result_to_string(result));

Date:

extern crate xlformula_engine;
use xlformula_engine::calculate;
use xlformula_engine::parse_formula;
use xlformula_engine::types;
use chrono::format::ParseError;
use chrono::{DateTime, FixedOffset};
use xlformula_engine::NoCustomFunction;

fn main() -> Result<(), ParseError> {
let start: DateTime<FixedOffset> = DateTime::parse_from_rfc3339("2019-03-01T02:00:00.000Z")?;
let end: DateTime<FixedOffset> = DateTime::parse_from_rfc3339("2019-08-30T02:00:00.000Z")?;
let data_function = |s: String| match s.as_str() {
"start" => types::Value::Date(start),
"end" => types::Value::Date(end),
_ => types::Value::Error(types::Error::Value),
};

let formula = parse_formula::parse_string_to_formula(&"=DAYS(end, start)", None::<NoCustomFunction>);
let result = calculate::calculate_formula(formula, Some(&data_function));
println!("Result is {}", calculate::result_to_string(result));

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

let formula = parse_formula::parse_string_to_formula(&"=end-3", None::<NoCustomFunction>);
let result = calculate::calculate_formula(formula, Some(&data_function));
println!("Result is {}", calculate::result_to_string(result));
 Ok(())
}

Custom Function:

extern crate xlformula_engine;
use xlformula_engine::calculate;
use xlformula_engine::parse_formula;
use xlformula_engine::types;
use xlformula_engine::NoReference;

let custom_functions = |s: String, params: Vec<f32>| match s.as_str() {
"Increase" => types::Value::Number(params[0] + 1.0),
"SimpleSum" => types::Value::Number(params[0] + params[1]),
"EqualFive" => types::Value::Number(5.0),
_ => types::Value::Error(types::Error::Value),
};

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

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

let formula =
parse_formula::parse_string_to_formula(&"=SimpleSum(1,2)", Some(&custom_functions));
let result = calculate::calculate_formula(formula, None::<NoReference>);
println!("Result is {}", calculate::result_to_string(result));

Handle blank in calculation:

extern crate xlformula_engine;
use xlformula_engine::calculate;
use xlformula_engine::parse_formula;
use xlformula_engine::types;
use chrono::format::ParseError;
use chrono::{DateTime, FixedOffset};
use xlformula_engine::NoReference;
use xlformula_engine::NoCustomFunction;

let data_function = |s: String| match s.as_str() {
"B" => types::Value::Blank,
_ => types::Value::Error(types::Error::Value),
};

let custom_functions = |s: String, params: Vec<f32>| match s.as_str() {
"BLANK" => types::Value::Blank,
_ => types::Value::Error(types::Error::Value),
};

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

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

//takes list as input
let formula = parse_formula::parse_string_to_formula(&"=SUM({B, 1})", None::<NoCustomFunction>);
let result = calculate::calculate_formula(formula, Some(&data_function));
println!("Result is {}", calculate::result_to_string(result));

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

Modules

Evaluates a formula.

Parses a string using pest and pest::prec_climber.

The Structs and Enums for the calculation.

Type Definitions