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extern crate reqwest;
extern crate serde_json;
#[macro_use]
extern crate failure;
use self::serde_json::Value;
use failure::Error;
const ENDPOINT: &str = "https://newton.now.sh";
pub type StringResult = Result<String, Error>;
pub type VectorResult = Result<Vec<i64>, Error>;
pub fn simplify(expression: &str) -> StringResult {
let url = format!("{}/simplify/{}", ENDPOINT, expression);
fetch_result(&url)
}
pub fn factor(expression: &str) -> StringResult {
let url = format!("{}/factor/{}", ENDPOINT, expression);
fetch_result(&url)
}
pub fn derive(expression: &str) -> StringResult {
let url = format!("{}/derive/{}", ENDPOINT, expression);
fetch_result(&url)
}
pub fn integrate(expression: &str) -> StringResult {
let url = format!("{}/integrate/{}", ENDPOINT, expression);
fetch_result(&url)
}
pub fn find_zeroes(expression: &str) -> VectorResult {
let url = format!("{}/zeroes/{}", ENDPOINT, expression);
let mut response = reqwest::get(&url)?;
let data: Value = serde_json::from_str(&response.text()?)?;
let mut val = Vec::new();
match data["result"].as_array() {
None => Err(format_err!("Result not an array")),
Some(arr) => {
for i in arr {
match i.as_i64() {
None => return Err(format_err!("Element in array not an integer")),
Some(ele) => val.push(ele),
};
}
Ok(val)
}
}
}
pub fn find_tangent(expression: &str) -> StringResult {
let url = format!("{}/tangent/{}", ENDPOINT, expression);
fetch_result(&url)
}
pub fn area_under_curve(expression: &str) -> StringResult {
let url = format!("{}/area/{}", ENDPOINT, expression);
fetch_result(&url)
}
pub fn cosine(expression: &str) -> StringResult {
let url = format!("{}/cos/{}", ENDPOINT, expression);
fetch_result(&url)
}
pub fn sine(expression: &str) -> StringResult {
let url = format!("{}/sin/{}", ENDPOINT, expression);
fetch_result(&url)
}
pub fn tangent(expression: &str) -> StringResult {
let url = format!("{}/tan/{}", ENDPOINT, expression);
fetch_result(&url)
}
pub fn inverse_cosine(expression: &str) -> StringResult {
let url = format!("{}/arccos/{}", ENDPOINT, expression);
fetch_result(&url)
}
pub fn inverse_sine(expression: &str) -> StringResult {
let url = format!("{}/arcsin/{}", ENDPOINT, expression);
fetch_result(&url)
}
pub fn inverse_tangent(expression: &str) -> StringResult {
let url = format!("{}/arctan/{}", ENDPOINT, expression);
fetch_result(&url)
}
pub fn absolute_value(expression: &str) -> StringResult {
let url = format!("{}/abs/{}", ENDPOINT, expression);
fetch_result(&url)
}
pub fn logarithm(expression: &str) -> StringResult {
let url = format!("{}/log/{}", ENDPOINT, expression);
fetch_result(&url)
}
fn fetch_result(url: &str) -> StringResult {
let mut response = reqwest::get(url)?;
let data: Value = serde_json::from_str(&response.text()?)?;
match data["result"].as_str() {
None => Err(format_err!("Result not a string")),
Some(val) => Ok(String::from(val)),
}
}