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//! Utilities for dealing with span tracking in the compiler.
use super::*;
use codemap::{File, Span};
use rowan::ast::AstNode;
/// Trait implemented by all types from which we can retrieve a span.
pub(super) trait ToSpan {
fn span_for(&self, file: &File) -> Span;
}
impl ToSpan for Span {
fn span_for(&self, _: &File) -> Span {
*self
}
}
impl ToSpan for rnix::SyntaxToken {
fn span_for(&self, file: &File) -> Span {
let rowan_span = self.text_range();
file.span.subspan(
u32::from(rowan_span.start()) as u64,
u32::from(rowan_span.end()) as u64,
)
}
}
impl ToSpan for rnix::SyntaxNode {
fn span_for(&self, file: &File) -> Span {
let rowan_span = self.text_range();
file.span.subspan(
u32::from(rowan_span.start()) as u64,
u32::from(rowan_span.end()) as u64,
)
}
}
/// Generates a `ToSpan` implementation for a type implementing
/// `rowan::AstNode`. This is impossible to do as a blanket
/// implementation because `rustc` forbids these implementations for
/// traits from third-party crates due to a belief that semantic
/// versioning truly could work (it doesn't).
macro_rules! expr_to_span {
( $type:path ) => {
impl ToSpan for $type {
fn span_for(&self, file: &File) -> Span {
self.syntax().span_for(file)
}
}
};
}
expr_to_span!(ast::Expr);
expr_to_span!(ast::Apply);
expr_to_span!(ast::Assert);
expr_to_span!(ast::Attr);
expr_to_span!(ast::AttrSet);
expr_to_span!(ast::Attrpath);
expr_to_span!(ast::AttrpathValue);
expr_to_span!(ast::BinOp);
expr_to_span!(ast::HasAttr);
expr_to_span!(ast::Ident);
expr_to_span!(ast::IdentParam);
expr_to_span!(ast::IfElse);
expr_to_span!(ast::Inherit);
expr_to_span!(ast::Interpol);
expr_to_span!(ast::Lambda);
expr_to_span!(ast::LegacyLet);
expr_to_span!(ast::LetIn);
expr_to_span!(ast::List);
expr_to_span!(ast::Literal);
expr_to_span!(ast::PatBind);
expr_to_span!(ast::Path);
expr_to_span!(ast::Pattern);
expr_to_span!(ast::Select);
expr_to_span!(ast::Str);
expr_to_span!(ast::UnaryOp);
expr_to_span!(ast::With);
impl Compiler<'_, '_> {
pub(super) fn span_for<S: ToSpan>(&self, to_span: &S) -> Span {
to_span.span_for(self.file)
}
}
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