Enum LSystemError 

pub enum LSystemError {
    DivideByZero,
    InvalidFloat,
    NoBoundingBox,
    FileSystemError(Box<dyn Error>),
    DeserializationError(Box<dyn Error>),
}

Combined error type for the crate.

Variants

DivideByZero

Indicates division by zero attempted.

Example

use std::collections::HashMap;

use l_system_fractals::rules::DrawRules;

let dr = DrawRules::new_simple(
    HashMap::from([('A', "A-A+A-A".into())]),
    1,
    0 // denominator of a fraction
);

assert!(dr.is_err());

let err_msg = format!("{:?}", dr);
assert!(err_msg.contains("DivideByZero"));

InvalidFloat

Indicates a float that is NaN or ±∞.

These do not make sense in the context of SVG coordinates.

This error is raised by, e.g., crate::num_validity::err_if_invalid.

Example

use l_system_fractals::num_validity::err_if_invalid;

let x = err_if_invalid(f64::NAN);

let err_msg = format!("{:?}", x);
assert!(err_msg.contains("InvalidFloat"));

NoBoundingBox

Indicates that no bounding box could be computed in a context where it is required.

This error is raised by, e.g., crate::paths::Path::bounding_box.

Example

use l_system_fractals::paths::{Path, Point};

let empty_vec: Vec<Point> = vec![];
let empty_path = Path::from(empty_vec);
let bb = empty_path.bounding_box();

let err_msg = format!("{:?}", bb);
assert!(err_msg.contains("NoBoundingBox"));

FileSystemError(Box<dyn Error>)

Indicates a file system error (e.g. incorrect file name).

DeserializationError(Box<dyn Error>)

Indicates a problem in the deserialization process (e.g. malformed JSON).

Trait Implementations

impl Debug for LSystemError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for LSystemError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for LSystemError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.