forked from extern/nushell
45 lines
1.3 KiB
Rust
45 lines
1.3 KiB
Rust
use nu_source::{DebugDocBuilder, HasSpan, Spanned, SpannedItem, Tagged};
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/// A trait that allows structures to define a known .type_name() which pretty-prints the type
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pub trait ShellTypeName {
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fn type_name(&self) -> &'static str;
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}
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impl<T: ShellTypeName> ShellTypeName for Spanned<T> {
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/// Return the type_name of the spanned item
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fn type_name(&self) -> &'static str {
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self.item.type_name()
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}
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}
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impl<T: ShellTypeName> ShellTypeName for &T {
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/// Return the type_name for the borrowed reference
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fn type_name(&self) -> &'static str {
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(*self).type_name()
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}
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}
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/// A trait that allows structures to define a known way to return a spanned type name
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pub trait SpannedTypeName {
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fn spanned_type_name(&self) -> Spanned<&'static str>;
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}
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impl<T: ShellTypeName + HasSpan> SpannedTypeName for T {
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/// Return the type name as a spanned string
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fn spanned_type_name(&self) -> Spanned<&'static str> {
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self.type_name().spanned(self.span())
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}
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}
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impl<T: ShellTypeName> SpannedTypeName for Tagged<T> {
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/// Return the spanned type name for a Tagged value
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fn spanned_type_name(&self) -> Spanned<&'static str> {
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self.item.type_name().spanned(self.tag.span)
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}
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}
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/// A trait to enable pretty-printing of type information
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pub trait PrettyType {
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fn pretty_type(&self) -> DebugDocBuilder;
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}
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