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generate assoc. consts in enums representing protobuf enum aliases, resolves #792 #849

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generate assoc. consts in enums representing protobuf enum aliases, resolves #792 #849

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0288841
generate associated constants in enums representing protobuf enum ali…
ousado Apr 23, 2023
09f2e99
rustfmt; Handle collisions of generated names between aliases and exi…
ousado Apr 23, 2023
4fe05fc
accomodate funny (comment aware) test
ousado Apr 23, 2023
0378107
always refer to first variant with a given value in case of multiple …
ousado Apr 24, 2023
93d039b
fix comment, move loop into if block
ousado Apr 21, 2024
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51 changes: 44 additions & 7 deletions prost-build/src/code_generator.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -662,7 +662,12 @@ impl<'a> CodeGenerator<'a> {

self.depth += 1;
self.path.push(2);
let mut aliases = vec![];
for variant in variant_mappings.iter() {
if variant.alias_of.is_some() {
aliases.push(variant);
continue;
}
self.path.push(variant.path_idx as i32);

self.append_doc(&fq_proto_enum_name, Some(variant.proto_name));
Expand All @@ -688,7 +693,23 @@ impl<'a> CodeGenerator<'a> {
self.buf.push_str(" {\n");
self.depth += 1;
self.path.push(2);

if aliases.len() > 0 {
self.push_indent();
self.buf.push_str("// Aliases.\n");

for variant in &aliases {
self.push_indent();
self.buf.push_str("#[allow(non_upper_case_globals)]");
self.push_indent();
self.buf.push_str(&format!(
"pub const {}: {} = {}::{};\n",
variant.generated_variant_name,
enum_name,
enum_name,
variant.alias_of.as_ref().unwrap()
));
}
}
self.push_indent();
self.buf.push_str(
"/// String value of the enum field names used in the ProtoBuf definition.\n",
Expand All @@ -713,6 +734,9 @@ impl<'a> CodeGenerator<'a> {
self.depth += 1;

for variant in variant_mappings.iter() {
if variant.alias_of.is_some() {
continue;
}
self.push_indent();
self.buf.push_str(&enum_name);
self.buf.push_str("::");
Expand Down Expand Up @@ -1136,6 +1160,7 @@ struct EnumVariantMapping<'a> {
proto_name: &'a str,
proto_number: i32,
generated_variant_name: String,
alias_of: Option<String>,
}

fn build_enum_value_mappings<'a>(
Expand All @@ -1145,15 +1170,20 @@ fn build_enum_value_mappings<'a>(
) -> Vec<EnumVariantMapping<'a>> {
let mut numbers = HashSet::new();
let mut generated_names = HashMap::new();
let mut mappings = Vec::new();
let mut mappings: Vec<EnumVariantMapping<'a>> = Vec::new();

for (idx, value) in enum_values.iter().enumerate() {
// Skip duplicate enum values. Protobuf allows this when the
// Remember name for duplicate enum values. Protobuf allows this when the
// 'allow_alias' option is set.
let mut alias_of = None;
if !numbers.insert(value.number()) {
continue;
for m in &mappings {
if m.proto_number == value.number() {
Comment on lines 1179 to +1181
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genereated_names can be used to do this lookup in one step, right?

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I don't see how, that would require a lookup by value instead of name, no?

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You are right. The HashMap is the other way around. Please disregard my comment.

alias_of = Some(m.generated_variant_name.clone());
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break;
}
}
}

let mut generated_variant_name = to_upper_camel(value.name());
if do_strip_enum_prefix {
generated_variant_name =
Expand All @@ -1162,15 +1192,22 @@ fn build_enum_value_mappings<'a>(

if let Some(old_v) = generated_names.insert(generated_variant_name.to_owned(), value.name())
{
panic!("Generated enum variant names overlap: `{}` variant name to be used both by `{}` and `{}` ProtoBuf enum values",
generated_variant_name, old_v, value.name());
// if alias ends up being a duplicate, we don't need it, and can skip it.
// TODO: check if enum values are actually the same
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I think this TODO needs to be solved

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I feel like duplicates should always be disallowed. Even if they are an alias, then overlap is not disirable.

if alias_of.is_some() {
continue;
} else {
panic!("Generated enum variant names overlap: `{}` variant name to be used both by `{}` and `{}` ProtoBuf enum values",
generated_variant_name, old_v, value.name());
}
}

mappings.push(EnumVariantMapping {
path_idx: idx,
proto_name: value.name(),
proto_number: value.number(),
generated_variant_name,
alias_of,
})
}
mappings
Expand Down
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