2022-10-06 13:33:09 +02:00
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//! Utilities for dealing with span tracking in the compiler and in
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//! error reporting.
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2022-09-16 20:51:03 +02:00
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use codemap::{File, Span};
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2022-10-06 13:33:09 +02:00
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use rnix::ast;
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2022-09-16 20:51:03 +02:00
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use rowan::ast::AstNode;
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/// Trait implemented by all types from which we can retrieve a span.
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2022-10-06 13:33:09 +02:00
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pub trait ToSpan {
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2022-09-16 20:51:03 +02:00
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fn span_for(&self, file: &File) -> Span;
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}
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impl ToSpan for Span {
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fn span_for(&self, _: &File) -> Span {
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*self
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}
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}
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impl ToSpan for rnix::SyntaxToken {
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fn span_for(&self, file: &File) -> Span {
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let rowan_span = self.text_range();
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file.span.subspan(
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u32::from(rowan_span.start()) as u64,
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u32::from(rowan_span.end()) as u64,
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)
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}
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}
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impl ToSpan for rnix::SyntaxNode {
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fn span_for(&self, file: &File) -> Span {
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let rowan_span = self.text_range();
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file.span.subspan(
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u32::from(rowan_span.start()) as u64,
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u32::from(rowan_span.end()) as u64,
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)
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}
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}
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/// Generates a `ToSpan` implementation for a type implementing
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/// `rowan::AstNode`. This is impossible to do as a blanket
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/// implementation because `rustc` forbids these implementations for
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/// traits from third-party crates due to a belief that semantic
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/// versioning truly could work (it doesn't).
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macro_rules! expr_to_span {
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( $type:path ) => {
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impl ToSpan for $type {
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fn span_for(&self, file: &File) -> Span {
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self.syntax().span_for(file)
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}
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}
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};
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}
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expr_to_span!(ast::Expr);
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expr_to_span!(ast::Apply);
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expr_to_span!(ast::Assert);
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expr_to_span!(ast::Attr);
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expr_to_span!(ast::AttrSet);
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expr_to_span!(ast::Attrpath);
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expr_to_span!(ast::AttrpathValue);
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expr_to_span!(ast::BinOp);
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expr_to_span!(ast::HasAttr);
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expr_to_span!(ast::Ident);
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expr_to_span!(ast::IdentParam);
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expr_to_span!(ast::IfElse);
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expr_to_span!(ast::Inherit);
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expr_to_span!(ast::Interpol);
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expr_to_span!(ast::Lambda);
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expr_to_span!(ast::LegacyLet);
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expr_to_span!(ast::LetIn);
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expr_to_span!(ast::List);
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expr_to_span!(ast::Literal);
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expr_to_span!(ast::PatBind);
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expr_to_span!(ast::Path);
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expr_to_span!(ast::Pattern);
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expr_to_span!(ast::Select);
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expr_to_span!(ast::Str);
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expr_to_span!(ast::UnaryOp);
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expr_to_span!(ast::With);
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