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use super::{Assembly, RawRoute, Value, Verifier};
use anyhow::{Result, ensure};
use std::{collections::BTreeMap, path::Path};
use syn::Expr;
fn last(path: &syn::Path) -> String {
path.segments
.last()
.map(|segment| segment.ident.to_string())
.unwrap_or_default()
}
impl Verifier {
pub(super) fn expression(
&mut self,
expression: &Expr,
variables: &mut BTreeMap<String, Value>,
source: &Path,
) -> Result<Value> {
match expression {
Expr::Paren(value) => self.expression(&value.expr, variables, source),
Expr::Try(value) => self.expression(&value.expr, variables, source),
Expr::Path(value) if value.path.segments.len() == 1 && value.qself.is_none() => {
Ok(variables
.get(&last(&value.path))
.cloned()
.unwrap_or(Value::Unknown))
}
Expr::Struct(value) if last(&value.path) == "Bindings" => {
ensure!(
!value
.fields
.iter()
.any(|field| touches_tracked(&field.expr, variables)),
"Binding constructor touches tracked router state"
);
ensure!(
value.rest.is_none(),
"Binding update expressions need explicit resolution"
);
let mut fields: Vec<_> = value
.fields
.iter()
.map(|field| match &field.member {
syn::Member::Named(name) => name.to_string(),
syn::Member::Unnamed(index) => index.index.to_string(),
})
.collect();
fields.sort();
let group = self.groups.get(&fields).ok_or_else(|| {
anyhow::anyhow!(
"Binding fields do not identify a complete exported operation set"
)
})?;
let resolved = self.resolver.binding(source, &value.path)?;
ensure!(
self.group_sources.get(&resolved) == Some(group),
"Binding type resolves to a different compiled declaration"
);
Ok(Value::Bindings(group.clone()))
}
Expr::Call(call) => {
let Expr::Path(path) = call.func.as_ref() else {
return Ok(Value::Unknown);
};
let name = last(&path.path);
let owner = path
.path
.segments
.iter()
.rev()
.nth(1)
.map(|segment| segment.ident.to_string());
if name == "new" && matches!(owner.as_deref(), Some("Router" | "ContractRouter")) {
ensure!(
self.resolver.framework_type(
source,
&path.path,
owner.as_deref().unwrap()
)?,
"Unresolved router constructor owner"
);
return Ok(Value::Router(Assembly {
finished: owner.as_deref() == Some("Router"),
..Assembly::default()
}));
}
if name == "new" && owner.as_deref() == Some("NativeApplication") {
ensure!(
!call
.args
.iter()
.skip(1)
.any(|argument| touches_tracked(argument, variables)),
"Application metadata touches tracked assembly state"
);
ensure!(
self.resolver
.framework_type(source, &path.path, "NativeApplication")?,
"Unresolved application constructor owner"
);
let value = self.expression(
call.args
.first()
.ok_or_else(|| anyhow::anyhow!("Application router missing"))?,
variables,
source,
)?;
let Value::Router(mut router) = value else {
anyhow::bail!("Unresolved managed application router")
};
router.application = true;
return Ok(Value::Router(router));
}
if name == "with_openapi" {
ensure!(
!call
.args
.iter()
.skip(1)
.any(|argument| touches_tracked(argument, variables)),
"Docs metadata touches tracked assembly state"
);
ensure!(
self.resolver
.routing_method(source, &path.path, "with_openapi")?,
"Unresolved framework docs adapter"
);
return self.expression(
call.args
.first()
.ok_or_else(|| anyhow::anyhow!("Docs router missing"))?,
variables,
source,
);
}
if name == "Ok" && path.path.segments.len() == 1 {
ensure!(
!self.functions.contains_key("Ok") && self.resolver.standard_ok(source)?,
"Shadowed Result constructor"
);
return self.expression(
call.args
.first()
.ok_or_else(|| anyhow::anyhow!("Empty Result constructor"))?,
variables,
source,
);
}
if self.functions.contains_key(&name) {
let (resolved, kind) = self.resolver.binding(source, &path.path)?;
ensure!(
kind == "$function",
"Unresolved router assembly function path"
);
let arguments = call
.args
.iter()
.map(|argument| self.expression(argument, variables, source))
.collect::<Result<Vec<_>>>()?;
self.function(&name, Some(&resolved), arguments)
} else {
ensure!(
!call
.args
.iter()
.any(|argument| touches_tracked(argument, variables)),
"Unknown call receives tracked router or bindings"
);
Ok(Value::Unknown)
}
}
Expr::MethodCall(call) => {
let value = self.expression(&call.receiver, variables, source)?;
let method = call.method.to_string();
match (value, method.as_str()) {
(Value::Bindings(group), "mount") => {
let argument = call
.args
.first()
.ok_or_else(|| anyhow::anyhow!("Binding router missing"))?;
let Value::Router(mut router) =
self.expression(argument, variables, source)?
else {
anyhow::bail!("Unresolved binding mount router")
};
ensure!(
router.groups.insert(group),
"Static operation set mounted more than once"
);
router.finished = false;
Ok(Value::Router(router))
}
(Value::Router(mut router), "finish") => {
router.finished = true;
Ok(Value::Router(router))
}
(Value::Router(mut router), "merge") => {
let argument = call
.args
.first()
.ok_or_else(|| anyhow::anyhow!("Merged router missing"))?;
let Value::Router(other) = self.expression(argument, variables, source)?
else {
anyhow::bail!("Unresolved merged router")
};
ensure!(
other.finished,
"Merged managed router has no finish boundary"
);
for group in other.groups {
ensure!(
router.groups.insert(group),
"Static operation set mounted more than once"
);
}
router.raw.extend(other.raw);
Ok(Value::Router(router))
}
(Value::Router(mut router), "route") => {
let Some(Expr::Lit(path)) = call.args.first() else {
anyhow::bail!("Dynamic unmanaged route path")
};
let syn::Lit::Str(path) = &path.lit else {
anyhow::bail!("Unmanaged route path must be a literal")
};
let Some(Expr::Call(handler)) = call.args.iter().nth(1) else {
anyhow::bail!("Unmanaged route methods need explicit resolution")
};
let Expr::Path(handler) = handler.func.as_ref() else {
anyhow::bail!("Unmanaged route method needs explicit resolution")
};
ensure!(
self.resolver.routing_method(
source,
&handler.path,
&last(&handler.path)
)?,
"Unmanaged method constructor owner is unresolved"
);
let method = last(&handler.path).to_ascii_uppercase();
ensure!(
matches!(
method.as_str(),
"GET" | "POST" | "PUT" | "PATCH" | "DELETE" | "HEAD" | "OPTIONS"
),
"Unsupported unmanaged route method"
);
router.raw.push(RawRoute {
method,
path: path.value(),
source: source.into(),
});
Ok(Value::Router(router))
}
(value, "expect" | "unwrap") => {
ensure!(
call.args
.iter()
.all(|argument| matches!(argument, Expr::Lit(_))),
"Nonliteral unwrap/expect arguments need explicit effect resolution"
);
Ok(value)
}
// Neither changes which routes are assembled.
(Value::Router(router), "with_state" | "with_cors_origins") => {
ensure!(
!call
.args
.iter()
.any(|argument| touches_tracked(argument, variables)),
"State constructor touches tracked assembly state"
);
Ok(Value::Router(router))
}
(Value::Router(_), _) => {
anyhow::bail!("Unsupported router assembly method {method}")
}
_ => {
ensure!(
!call
.args
.iter()
.any(|argument| touches_tracked(argument, variables)),
"Unknown method receives tracked assembly state"
);
Ok(Value::Unknown)
}
}
}
Expr::If(_)
| Expr::Match(_)
| Expr::Loop(_)
| Expr::While(_)
| Expr::ForLoop(_)
| Expr::Assign(_)
| Expr::Unsafe(_)
| Expr::Macro(_) => {
anyhow::bail!("Unsupported control flow or mutation in router assembly")
}
// Unknown expressions cannot borrow or consume tracked assembly state.
_ => {
ensure!(
!touches_tracked(expression, variables),
"Unsupported expression touches tracked assembly state"
);
Ok(Value::Unknown)
}
}
}
}
fn touches_tracked(expression: &Expr, variables: &BTreeMap<String, Value>) -> bool {
struct Find<'a> {
variables: &'a BTreeMap<String, Value>,
found: bool,
}
impl<'ast> syn::visit::Visit<'ast> for Find<'_> {
fn visit_expr_path(&mut self, path: &'ast syn::ExprPath) {
if path.path.segments.len() == 1
&& self
.variables
.get(&last(&path.path))
.is_some_and(|value| !matches!(value, Value::Unknown))
{
self.found = true;
}
syn::visit::visit_expr_path(self, path);
}
}
let mut find = Find {
variables,
found: false,
};
syn::visit::Visit::visit_expr(&mut find, expression);
find.found
}