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use std::{collections::BTreeMap, fmt, mem, sync::Arc}; use crate::{ ast::Argument, symbol::{Symbol, SymbolRef}, }; pub trait MetadataEnv { fn get_metadata(&self, id: &SymbolRef) -> Option<Arc<Metadata>>; } impl<'a, T: ?Sized + MetadataEnv> MetadataEnv for &'a T { fn get_metadata(&self, id: &SymbolRef) -> Option<Arc<Metadata>> { (**self).get_metadata(id) } } impl MetadataEnv for () { fn get_metadata(&self, _id: &SymbolRef) -> Option<Arc<Metadata>> { None } } #[derive(Clone, Copy, Eq, PartialEq, Debug, Hash)] #[cfg_attr(feature = "serde_derive", derive(Deserialize, Serialize))] pub enum CommentType { Block, Line, } #[derive(Clone, Eq, PartialEq, Debug, Hash)] #[cfg_attr(feature = "serde_derive", derive(Deserialize, Serialize))] pub struct Comment<S = String> { pub typ: CommentType, pub content: S, } #[derive(Clone, Debug, Default, Eq, PartialEq, Hash)] #[cfg_attr(feature = "serde_derive", derive(Deserialize, Serialize))] pub struct Attribute { pub name: String, pub arguments: Option<String>, } impl fmt::Display for Attribute { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "#[{}", self.name)?; if let Some(arguments) = &self.arguments { write!(f, "({})", arguments)?; } write!(f, "]") } } #[derive(Debug, Default, Eq, PartialEq, Hash, gluon_codegen::AstClone)] pub struct BaseMetadata<'ast> { pub metadata: Option<&'ast mut Metadata>, } impl From<BaseMetadata<'_>> for Metadata { fn from(meta: BaseMetadata<'_>) -> Self { meta.metadata.map(|m| m.clone()).unwrap_or_default() } } #[derive(Clone, Debug, Default, Eq, PartialEq, Hash)] #[cfg_attr(feature = "serde_derive", derive(Deserialize, Serialize))] pub struct Metadata { pub definition: Option<Symbol>, pub comment: Option<Comment>, pub attributes: Vec<Attribute>, pub args: Vec<Argument<Symbol>>, pub module: BTreeMap<String, Arc<Metadata>>, } impl Metadata { pub fn has_data(&self) -> bool { self.definition.is_some() || self.comment.is_some() || !self.module.is_empty() || !self.attributes.is_empty() } pub fn merge(mut self, other: Metadata) -> Metadata { self.merge_with(other); self } pub fn merge_with(&mut self, other: Metadata) { if other.definition.is_some() { self.definition = other.definition; } if self.comment.is_none() { self.comment = other.comment; } for (key, value) in other.module { use std::collections::btree_map::Entry; match self.module.entry(key) { Entry::Vacant(entry) => { entry.insert(value); } Entry::Occupied(entry) => Arc::make_mut(entry.into_mut()).merge_with_ref(&value), } } self.attributes.extend(other.attributes); if self.args.is_empty() { self.args = other.args; } } pub fn merge_ref(mut self, other: &Metadata) -> Self { self.merge_with_ref(other); self } pub fn merge_with_ref(&mut self, other: &Metadata) { if other.definition.is_some() { self.definition = other.definition.clone(); } if self.comment.is_none() { self.comment = other.comment.clone(); } for (key, value) in &other.module { use std::collections::btree_map::Entry; match self.module.entry(key.clone()) { Entry::Vacant(entry) => { entry.insert(value.clone()); } Entry::Occupied(entry) => Arc::make_mut(entry.into_mut()).merge_with_ref(&value), } } self.attributes.extend(other.attributes.iter().cloned()); if self.args.is_empty() { self.args = other.args.clone(); } } pub fn merge_with_base(mut self, other: &BaseMetadata<'_>) -> Self { self.merge_with_base_ref(other); self } pub fn merge_with_base_ref(&mut self, other: &BaseMetadata<'_>) { if let Some(other) = &other.metadata { self.merge_with_ref(other); } } pub fn get_attribute(&self, name: &str) -> Option<&str> { self.attributes() .find(|attribute| attribute.name == name) .map(|t| t.arguments.as_ref().map_or("", |s| s)) } pub fn attributes(&self) -> impl Iterator<Item = &Attribute> { self.attributes.iter() } } impl<'ast> BaseMetadata<'ast> { pub fn has_data(&self) -> bool { self.metadata.is_some() } pub fn merge(&mut self, metadata: BaseMetadata<'ast>) { match &mut self.metadata { Some(self_) => { if let Some(metadata) = metadata.metadata { self_.merge_with(mem::take(metadata)); } } None => *self = metadata, } } pub fn comment(&self) -> Option<&Comment> { self.metadata.as_ref().and_then(|m| m.comment.as_ref()) } pub fn get_attribute(&self, name: &str) -> Option<&str> { self.attributes() .find(|attribute| attribute.name == name) .map(|t| t.arguments.as_ref().map_or("", |s| s)) } pub fn attributes(&self) -> impl Iterator<Item = &Attribute> { self.metadata.iter().flat_map(|m| m.attributes()) } pub fn to_metadata(&self) -> Metadata { self.metadata .as_ref() .map(|m| (**m).clone()) .unwrap_or_default() } }