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#[backtrace] attribute for explicitly selecting the backtrace field

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David Tolnay 2019-10-12 14:38:45 -07:00
parent de6719e923
commit 72cf49ccd4
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GPG key ID: F9BA143B95FF6D82
4 changed files with 52 additions and 18 deletions
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30
impl/src/valid.rs
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@ -15,8 +15,8 @@ impl Input<'_> {
impl Struct<'_> {
fn validate(&self) -> Result<()> {
check_no_source(&self.attrs)?;
find_duplicate_source(&self.fields)?;
check_no_source_or_backtrace(&self.attrs)?;
check_no_duplicate_source_or_backtrace(&self.fields)?;
for field in &self.fields {
field.validate()?;
}
@ -26,7 +26,7 @@ impl Struct<'_> {
impl Enum<'_> {
fn validate(&self) -> Result<()> {
check_no_source(&self.attrs)?;
check_no_source_or_backtrace(&self.attrs)?;
let has_display = self.has_display();
for variant in &self.variants {
variant.validate()?;
@ -43,8 +43,8 @@ impl Enum<'_> {
impl Variant<'_> {
fn validate(&self) -> Result<()> {
check_no_source(&self.attrs)?;
find_duplicate_source(&self.fields)?;
check_no_source_or_backtrace(&self.attrs)?;
check_no_duplicate_source_or_backtrace(&self.fields)?;
for field in &self.fields {
field.validate()?;
}
@ -64,18 +64,25 @@ impl Field<'_> {
}
}
fn check_no_source(attrs: &Attrs) -> Result<()> {
fn check_no_source_or_backtrace(attrs: &Attrs) -> Result<()> {
if let Some(source) = &attrs.source {
return Err(Error::new_spanned(
source.original,
"not expected here; the #[source] attribute belongs on a specific field",
));
}
if let Some(backtrace) = &attrs.backtrace {
return Err(Error::new_spanned(
backtrace.original,
"not expected here; the #[backtrace] attribute belongs on a specific field",
));
}
Ok(())
}
fn find_duplicate_source(fields: &[Field]) -> Result<()> {
fn check_no_duplicate_source_or_backtrace(fields: &[Field]) -> Result<()> {
let mut has_source = false;
let mut has_backtrace = false;
for field in fields {
if let Some(source) = &field.attrs.source {
if has_source {
@ -86,6 +93,15 @@ fn find_duplicate_source(fields: &[Field]) -> Result<()> {
}
has_source = true;
}
if let Some(backtrace) = &field.attrs.backtrace {
if has_backtrace {
return Err(Error::new_spanned(
backtrace.original,
"duplicate #[backtrace] attribute",
));
}
has_backtrace = true;
}
}
Ok(())
}