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|
use std::collections::{hash_map, HashMap};
use itertools::Itertools;
use crate::ident::{to_snake, to_upper_camel};
fn validate_proto_path(path: &str) -> Result<(), String> {
if path.chars().next().map(|c| c != '.').unwrap_or(true) {
return Err(format!(
"Protobuf paths must be fully qualified (begin with a leading '.'): {}",
path
));
}
if path.split('.').skip(1).any(str::is_empty) {
return Err(format!("invalid fully-qualified Protobuf path: {}", path));
}
Ok(())
}
#[derive(Debug)]
pub struct ExternPaths {
extern_paths: HashMap<String, String>,
}
impl ExternPaths {
pub fn new(paths: &[(String, String)], prost_types: bool) -> Result<ExternPaths, String> {
let mut extern_paths = ExternPaths {
extern_paths: HashMap::new(),
};
for (proto_path, rust_path) in paths {
extern_paths.insert(proto_path.clone(), rust_path.clone())?;
}
if prost_types {
extern_paths.insert(".google.protobuf".to_string(), "::prost_types".to_string())?;
extern_paths.insert(".google.protobuf.BoolValue".to_string(), "bool".to_string())?;
extern_paths.insert(
".google.protobuf.BytesValue".to_string(),
"::prost::alloc::vec::Vec<u8>".to_string(),
)?;
extern_paths.insert(
".google.protobuf.DoubleValue".to_string(),
"f64".to_string(),
)?;
extern_paths.insert(".google.protobuf.Empty".to_string(), "()".to_string())?;
extern_paths.insert(".google.protobuf.FloatValue".to_string(), "f32".to_string())?;
extern_paths.insert(".google.protobuf.Int32Value".to_string(), "i32".to_string())?;
extern_paths.insert(".google.protobuf.Int64Value".to_string(), "i64".to_string())?;
extern_paths.insert(
".google.protobuf.StringValue".to_string(),
"::prost::alloc::string::String".to_string(),
)?;
extern_paths.insert(
".google.protobuf.UInt32Value".to_string(),
"u32".to_string(),
)?;
extern_paths.insert(
".google.protobuf.UInt64Value".to_string(),
"u64".to_string(),
)?;
}
Ok(extern_paths)
}
fn insert(&mut self, proto_path: String, rust_path: String) -> Result<(), String> {
validate_proto_path(&proto_path)?;
match self.extern_paths.entry(proto_path) {
hash_map::Entry::Occupied(occupied) => {
return Err(format!(
"duplicate extern Protobuf path: {}",
occupied.key()
));
}
hash_map::Entry::Vacant(vacant) => vacant.insert(rust_path),
};
Ok(())
}
pub fn resolve_ident(&self, pb_ident: &str) -> Option<String> {
// protoc should always give fully qualified identifiers.
assert_eq!(".", &pb_ident[..1]);
if let Some(rust_path) = self.extern_paths.get(pb_ident) {
return Some(rust_path.clone());
}
// TODO(danburkert): there must be a more efficient way to do this, maybe a trie?
for (idx, _) in pb_ident.rmatch_indices('.') {
if let Some(rust_path) = self.extern_paths.get(&pb_ident[..idx]) {
let mut segments = pb_ident[idx + 1..].split('.');
let ident_type = segments.next_back().map(to_upper_camel);
return Some(
rust_path
.split("::")
.chain(segments)
.enumerate()
.map(|(idx, segment)| {
if idx == 0 && segment == "crate" {
// If the first segment of the path is 'crate', then do not escape
// it into a raw identifier, since it's being used as the keyword.
segment.to_owned()
} else {
to_snake(segment)
}
})
.chain(ident_type.into_iter())
.join("::"),
);
}
}
None
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_extern_paths() {
let paths = ExternPaths::new(
&[
(".foo".to_string(), "::foo1".to_string()),
(".foo.bar".to_string(), "::foo2".to_string()),
(".foo.baz".to_string(), "::foo3".to_string()),
(".foo.Fuzz".to_string(), "::foo4::Fuzz".to_string()),
(".a.b.c.d.e.f".to_string(), "::abc::def".to_string()),
],
false,
)
.unwrap();
let case = |proto_ident: &str, resolved_ident: &str| {
assert_eq!(paths.resolve_ident(proto_ident).unwrap(), resolved_ident);
};
case(".foo", "::foo1");
case(".foo.Foo", "::foo1::Foo");
case(".foo.bar", "::foo2");
case(".foo.Bas", "::foo1::Bas");
case(".foo.bar.Bar", "::foo2::Bar");
case(".foo.Fuzz.Bar", "::foo4::fuzz::Bar");
case(".a.b.c.d.e.f", "::abc::def");
case(".a.b.c.d.e.f.g.FooBar.Baz", "::abc::def::g::foo_bar::Baz");
assert!(paths.resolve_ident(".a").is_none());
assert!(paths.resolve_ident(".a.b").is_none());
assert!(paths.resolve_ident(".a.c").is_none());
}
#[test]
fn test_well_known_types() {
let paths = ExternPaths::new(&[], true).unwrap();
let case = |proto_ident: &str, resolved_ident: &str| {
assert_eq!(paths.resolve_ident(proto_ident).unwrap(), resolved_ident);
};
case(".google.protobuf.Value", "::prost_types::Value");
case(".google.protobuf.Duration", "::prost_types::Duration");
case(".google.protobuf.Empty", "()");
}
#[test]
fn test_error_fully_qualified() {
let paths = [("foo".to_string(), "bar".to_string())];
let err = ExternPaths::new(&paths, false).unwrap_err();
assert_eq!(
err.to_string(),
"Protobuf paths must be fully qualified (begin with a leading '.'): foo"
)
}
#[test]
fn test_error_invalid_path() {
let paths = [(".foo.".to_string(), "bar".to_string())];
let err = ExternPaths::new(&paths, false).unwrap_err();
assert_eq!(
err.to_string(),
"invalid fully-qualified Protobuf path: .foo."
)
}
#[test]
fn test_error_duplicate() {
let paths = [
(".foo".to_string(), "bar".to_string()),
(".foo".to_string(), "bar".to_string()),
];
let err = ExternPaths::new(&paths, false).unwrap_err();
assert_eq!(err.to_string(), "duplicate extern Protobuf path: .foo")
}
}
|
