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//! Code shared between the WGSL front and back ends.
use std::fmt::{self, Display, Formatter};
use crate::diagnostic_filter::{
FilterableTriggeringRule, Severity, StandardFilterableTriggeringRule,
};
impl Severity {
const ERROR: &'static str = "error";
const WARNING: &'static str = "warning";
const INFO: &'static str = "info";
const OFF: &'static str = "off";
/// Convert from a sentinel word in WGSL into its associated [`Severity`], if possible.
pub fn from_wgsl_ident(s: &str) -> Option<Self> {
Some(match s {
Self::ERROR => Self::Error,
Self::WARNING => Self::Warning,
Self::INFO => Self::Info,
Self::OFF => Self::Off,
_ => return None,
})
}
}
struct DisplayFilterableTriggeringRule<'a>(&'a FilterableTriggeringRule);
impl Display for DisplayFilterableTriggeringRule<'_> {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
let &Self(inner) = self;
match *inner {
FilterableTriggeringRule::Standard(rule) => write!(f, "{}", rule.to_wgsl_ident()),
FilterableTriggeringRule::Unknown(ref rule) => write!(f, "{rule}"),
FilterableTriggeringRule::User(ref rules) => {
let &[ref seg1, ref seg2] = rules.as_ref();
write!(f, "{seg1}.{seg2}")
}
}
}
}
impl FilterableTriggeringRule {
/// [`Display`] this rule's identifiers in WGSL.
pub const fn display_wgsl_ident(&self) -> impl Display + '_ {
DisplayFilterableTriggeringRule(self)
}
}
impl StandardFilterableTriggeringRule {
const DERIVATIVE_UNIFORMITY: &'static str = "derivative_uniformity";
/// Convert from a sentinel word in WGSL into its associated
/// [`StandardFilterableTriggeringRule`], if possible.
pub fn from_wgsl_ident(s: &str) -> Option<Self> {
Some(match s {
Self::DERIVATIVE_UNIFORMITY => Self::DerivativeUniformity,
_ => return None,
})
}
/// Maps this [`StandardFilterableTriggeringRule`] into the sentinel word associated with it in
/// WGSL.
pub const fn to_wgsl_ident(self) -> &'static str {
match self {
Self::DerivativeUniformity => Self::DERIVATIVE_UNIFORMITY,
}
}
}