Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 202 insertions, 0 deletions

diff --git a/third_party/rust/serde_derive/src/internals/ast.rs b/third_party/rust/serde_derive/src/internals/ast.rs
new file mode 100644
index 0000000000..2a6950b2a7
--- /dev/null
+++ b/third_party/rust/serde_derive/src/internals/ast.rs
@@ -0,0 +1,202 @@
+//! A Serde ast, parsed from the Syn ast and ready to generate Rust code.
+
+use internals::attr;
+use internals::check;
+use internals::{Ctxt, Derive};
+use syn;
+use syn::punctuated::Punctuated;
+
+/// A source data structure annotated with `#[derive(Serialize)]` and/or `#[derive(Deserialize)]`,
+/// parsed into an internal representation.
+pub struct Container<'a> {
+    /// The struct or enum name (without generics).
+    pub ident: syn::Ident,
+    /// Attributes on the structure, parsed for Serde.
+    pub attrs: attr::Container,
+    /// The contents of the struct or enum.
+    pub data: Data<'a>,
+    /// Any generics on the struct or enum.
+    pub generics: &'a syn::Generics,
+    /// Original input.
+    pub original: &'a syn::DeriveInput,
+}
+
+/// The fields of a struct or enum.
+///
+/// Analogous to `syn::Data`.
+pub enum Data<'a> {
+    Enum(Vec<Variant<'a>>),
+    Struct(Style, Vec<Field<'a>>),
+}
+
+/// A variant of an enum.
+pub struct Variant<'a> {
+    pub ident: syn::Ident,
+    pub attrs: attr::Variant,
+    pub style: Style,
+    pub fields: Vec<Field<'a>>,
+    pub original: &'a syn::Variant,
+}
+
+/// A field of a struct.
+pub struct Field<'a> {
+    pub member: syn::Member,
+    pub attrs: attr::Field,
+    pub ty: &'a syn::Type,
+    pub original: &'a syn::Field,
+}
+
+#[derive(Copy, Clone)]
+pub enum Style {
+    /// Named fields.
+    Struct,
+    /// Many unnamed fields.
+    Tuple,
+    /// One unnamed field.
+    Newtype,
+    /// No fields.
+    Unit,
+}
+
+impl<'a> Container<'a> {
+    /// Convert the raw Syn ast into a parsed container object, collecting errors in `cx`.
+    pub fn from_ast(
+        cx: &Ctxt,
+        item: &'a syn::DeriveInput,
+        derive: Derive,
+    ) -> Option<Container<'a>> {
+        let mut attrs = attr::Container::from_ast(cx, item);
+
+        let mut data = match &item.data {
+            syn::Data::Enum(data) => Data::Enum(enum_from_ast(cx, &data.variants, attrs.default())),
+            syn::Data::Struct(data) => {
+                let (style, fields) = struct_from_ast(cx, &data.fields, None, attrs.default());
+                Data::Struct(style, fields)
+            }
+            syn::Data::Union(_) => {
+                cx.error_spanned_by(item, "Serde does not support derive for unions");
+                return None;
+            }
+        };
+
+        let mut has_flatten = false;
+        match &mut data {
+            Data::Enum(variants) => {
+                for variant in variants {
+                    variant.attrs.rename_by_rules(attrs.rename_all_rules());
+                    for field in &mut variant.fields {
+                        if field.attrs.flatten() {
+                            has_flatten = true;
+                        }
+                        field
+                            .attrs
+                            .rename_by_rules(variant.attrs.rename_all_rules());
+                    }
+                }
+            }
+            Data::Struct(_, fields) => {
+                for field in fields {
+                    if field.attrs.flatten() {
+                        has_flatten = true;
+                    }
+                    field.attrs.rename_by_rules(attrs.rename_all_rules());
+                }
+            }
+        }
+
+        if has_flatten {
+            attrs.mark_has_flatten();
+        }
+
+        let mut item = Container {
+            ident: item.ident.clone(),
+            attrs,
+            data,
+            generics: &item.generics,
+            original: item,
+        };
+        check::check(cx, &mut item, derive);
+        Some(item)
+    }
+}
+
+impl<'a> Data<'a> {
+    pub fn all_fields(&'a self) -> Box<Iterator<Item = &'a Field<'a>> + 'a> {
+        match self {
+            Data::Enum(variants) => {
+                Box::new(variants.iter().flat_map(|variant| variant.fields.iter()))
+            }
+            Data::Struct(_, fields) => Box::new(fields.iter()),
+        }
+    }
+
+    pub fn has_getter(&self) -> bool {
+        self.all_fields().any(|f| f.attrs.getter().is_some())
+    }
+}
+
+fn enum_from_ast<'a>(
+    cx: &Ctxt,
+    variants: &'a Punctuated<syn::Variant, Token![,]>,
+    container_default: &attr::Default,
+) -> Vec<Variant<'a>> {
+    variants
+        .iter()
+        .map(|variant| {
+            let attrs = attr::Variant::from_ast(cx, variant);
+            let (style, fields) =
+                struct_from_ast(cx, &variant.fields, Some(&attrs), container_default);
+            Variant {
+                ident: variant.ident.clone(),
+                attrs,
+                style,
+                fields,
+                original: variant,
+            }
+        })
+        .collect()
+}
+
+fn struct_from_ast<'a>(
+    cx: &Ctxt,
+    fields: &'a syn::Fields,
+    attrs: Option<&attr::Variant>,
+    container_default: &attr::Default,
+) -> (Style, Vec<Field<'a>>) {
+    match fields {
+        syn::Fields::Named(fields) => (
+            Style::Struct,
+            fields_from_ast(cx, &fields.named, attrs, container_default),
+        ),
+        syn::Fields::Unnamed(fields) if fields.unnamed.len() == 1 => (
+            Style::Newtype,
+            fields_from_ast(cx, &fields.unnamed, attrs, container_default),
+        ),
+        syn::Fields::Unnamed(fields) => (
+            Style::Tuple,
+            fields_from_ast(cx, &fields.unnamed, attrs, container_default),
+        ),
+        syn::Fields::Unit => (Style::Unit, Vec::new()),
+    }
+}
+
+fn fields_from_ast<'a>(
+    cx: &Ctxt,
+    fields: &'a Punctuated<syn::Field, Token![,]>,
+    attrs: Option<&attr::Variant>,
+    container_default: &attr::Default,
+) -> Vec<Field<'a>> {
+    fields
+        .iter()
+        .enumerate()
+        .map(|(i, field)| Field {
+            member: match &field.ident {
+                Some(ident) => syn::Member::Named(ident.clone()),
+                None => syn::Member::Unnamed(i.into()),
+            },
+            attrs: attr::Field::from_ast(cx, i, field, attrs, container_default),
+            ty: &field.ty,
+            original: field,
+        })
+        .collect()
+}