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use crate::dot::DotString;
use std::borrow::Cow;
// TODO: not sure we need this enum but should support setting nodeport either via
// headport / tailport attributes e.g. a -> b [tailport=se]
// or via edge declaration using the syntax node name:port_name e.g. a -> b:se
// aka compass
#[derive(Clone, PartialEq, Eq, Debug)]
pub enum CompassPoint {
N,
NE,
E,
SE,
S,
SW,
W,
NW,
/// pecifies the center of the node or port
C,
/// specifies that an appropriate side of the port adjacent to the exterior of the node should
/// be used, if such exists.
None,
}
impl<'a> DotString<'a> for CompassPoint {
fn dot_string(&self) -> Cow<'a, str> {
match self {
CompassPoint::N => "n".into(),
CompassPoint::NE => "ne".into(),
CompassPoint::E => "e".into(),
CompassPoint::SE => "se".into(),
CompassPoint::S => "s".into(),
CompassPoint::SW => "sw".into(),
CompassPoint::W => "w".into(),
CompassPoint::NW => "nw".into(),
CompassPoint::C => "c".into(),
CompassPoint::None => "_".into(),
}
}
}
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