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refactor(tvix/eval): generalise error variant for dynamic keys

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Change-Id: I08f40b4b53652a519e76d6e8344c7c3fe10a0689
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6767
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
This commit is contained in:
Vincent Ambo 2022-09-23 17:11:34 +03:00 • committed by tazjin
parent 71a8db108d
commit 846215ae2b
2 changed files with 17 additions and 31 deletions
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38
tvix/eval/src/compiler/bindings.rs
View file

@ -56,9 +56,7 @@ impl Compiler<'_> {
let name = match self.expr_static_attr_str(&attr) {
Some(name) => name,
None => {
// TODO(tazjin): error variant for dynamic
// key in *inherit* (or generalise it)
self.emit_error(&attr, ErrorKind::DynamicKeyInLet);
self.emit_error(&attr, ErrorKind::DynamicKeyInScope("inherit"));
continue;
}
};
@ -95,9 +93,7 @@ impl Compiler<'_> {
let name = match self.expr_static_attr_str(&attr) {
Some(name) => name,
None => {
// TODO(tazjin): error variant for dynamic
// key in *inherit* (or generalise it)
self.emit_error(&attr, ErrorKind::DynamicKeyInLet);
self.emit_error(&attr, ErrorKind::DynamicKeyInScope("inherit"));
continue;
}
};
@ -303,9 +299,7 @@ impl Compiler<'_> {
let name = match self.expr_static_attr_str(&attr) {
Some(name) => name,
None => {
// TODO(tazjin): error variant for dynamic
// key in *inherit* (or generalise it)
self.emit_error(&attr, ErrorKind::DynamicKeyInLet);
self.emit_error(&attr, ErrorKind::DynamicKeyInScope("inherit"));
continue;
}
};
@ -342,9 +336,7 @@ impl Compiler<'_> {
let name = match self.expr_static_attr_str(&attr) {
Some(name) => name,
None => {
// TODO(tazjin): error variant for dynamic
// key in *inherit* (or generalise it)
self.emit_error(&attr, ErrorKind::DynamicKeyInLet);
self.emit_error(&attr, ErrorKind::DynamicKeyInScope("inherit"));
continue;
}
};
@ -627,8 +619,14 @@ impl Compiler<'_> {
/// a string if possible, or raise an error about the node being
/// dynamic.
fn binding_name(&self, node: ast::Attr) -> EvalResult<String> {
self.expr_static_attr_str(&node)
.ok_or_else(|| self.dynamic_key_error(&node))
match self.expr_static_attr_str(&node) {
Some(s) => Ok(s),
None => Err(Error {
// this code path will go away soon, hence the TODO below
kind: ErrorKind::DynamicKeyInScope("TODO"),
span: self.span_for(&node),
}),
}
}
/// Normalises identifier fragments into a single string vector
@ -641,18 +639,6 @@ impl Compiler<'_> {
path.map(|node| self.binding_name(node)).collect()
}
/// Construct the error returned when a dynamic attribute is found
/// in a `let`-expression.
fn dynamic_key_error<N>(&self, node: &N) -> Error
where
N: ToSpan,
{
Error {
kind: ErrorKind::DynamicKeyInLet,
span: self.span_for(node),
}
}
/// Convert a non-dynamic string expression to a string if possible.
fn expr_static_str(&self, node: &ast::Str) -> Option<String> {
let mut parts = node.normalized_parts();

10
tvix/eval/src/errors.rs
View file

@ -47,8 +47,8 @@ pub enum ErrorKind {
/// Resolving a user-supplied path literal failed in some way.
PathResolution(String),
/// Dynamic keys are not allowed in let.
DynamicKeyInLet,
/// Dynamic keys are not allowed in some scopes.
DynamicKeyInScope(&'static str),
/// Unknown variable in statically known scope.
UnknownStaticVariable,
@ -175,8 +175,8 @@ impl Error {
ErrorKind::PathResolution(err) => format!("could not resolve path: {}", err),
ErrorKind::DynamicKeyInLet => {
"dynamically evaluated keys are not allowed in let-bindings".to_string()
ErrorKind::DynamicKeyInScope(scope) => {
format!("dynamically evaluated keys are not allowed in {}", scope)
}
ErrorKind::UnknownStaticVariable => "variable not found".to_string(),
@ -260,7 +260,7 @@ to a missing value in the attribute set(s) included via `with`."#,
ErrorKind::TypeError { .. } => "E006",
ErrorKind::Incomparable { .. } => "E007",
ErrorKind::PathResolution(_) => "E008",
ErrorKind::DynamicKeyInLet => "E009",
ErrorKind::DynamicKeyInScope(_) => "E009",
ErrorKind::UnknownStaticVariable => "E010",
ErrorKind::UnknownDynamicVariable(_) => "E011",
ErrorKind::VariableAlreadyDefined(_) => "E012",