зеркало из https://github.com/mozilla/gecko-dev.git
117 строки
2.9 KiB
Rust
117 строки
2.9 KiB
Rust
use syn;
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use attr;
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use Ctxt;
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pub struct Item<'a> {
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pub ident: syn::Ident,
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pub attrs: attr::Item,
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pub body: Body<'a>,
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pub generics: &'a syn::Generics,
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}
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pub enum Body<'a> {
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Enum(Vec<Variant<'a>>),
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Struct(Style, Vec<Field<'a>>),
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}
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pub struct Variant<'a> {
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pub ident: syn::Ident,
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pub attrs: attr::Variant,
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pub style: Style,
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pub fields: Vec<Field<'a>>,
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}
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pub struct Field<'a> {
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pub ident: Option<syn::Ident>,
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pub attrs: attr::Field,
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pub ty: &'a syn::Ty,
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}
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pub enum Style {
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Struct,
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Tuple,
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Newtype,
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Unit,
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}
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impl<'a> Item<'a> {
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pub fn from_ast(cx: &Ctxt, item: &'a syn::MacroInput) -> Item<'a> {
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let attrs = attr::Item::from_ast(cx, item);
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let body = match item.body {
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syn::Body::Enum(ref variants) => {
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Body::Enum(enum_from_ast(cx, variants))
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}
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syn::Body::Struct(ref variant_data) => {
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let (style, fields) = struct_from_ast(cx, variant_data);
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Body::Struct(style, fields)
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}
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};
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Item {
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ident: item.ident.clone(),
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attrs: attrs,
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body: body,
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generics: &item.generics,
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}
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}
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}
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impl<'a> Body<'a> {
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pub fn all_fields(&'a self) -> Box<Iterator<Item=&'a Field<'a>> + 'a> {
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match *self {
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Body::Enum(ref variants) => {
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Box::new(variants.iter()
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.flat_map(|variant| variant.fields.iter()))
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}
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Body::Struct(_, ref fields) => {
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Box::new(fields.iter())
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}
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}
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}
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}
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fn enum_from_ast<'a>(cx: &Ctxt, variants: &'a [syn::Variant]) -> Vec<Variant<'a>> {
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variants.iter()
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.map(|variant| {
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let (style, fields) = struct_from_ast(cx, &variant.data);
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Variant {
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ident: variant.ident.clone(),
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attrs: attr::Variant::from_ast(cx, variant),
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style: style,
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fields: fields,
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}
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})
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.collect()
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}
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fn struct_from_ast<'a>(cx: &Ctxt, data: &'a syn::VariantData) -> (Style, Vec<Field<'a>>) {
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match *data {
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syn::VariantData::Struct(ref fields) => {
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(Style::Struct, fields_from_ast(cx, fields))
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}
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syn::VariantData::Tuple(ref fields) if fields.len() == 1 => {
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(Style::Newtype, fields_from_ast(cx, fields))
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}
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syn::VariantData::Tuple(ref fields) => {
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(Style::Tuple, fields_from_ast(cx, fields))
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}
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syn::VariantData::Unit => {
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(Style::Unit, Vec::new())
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}
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}
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}
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fn fields_from_ast<'a>(cx: &Ctxt, fields: &'a [syn::Field]) -> Vec<Field<'a>> {
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fields.iter()
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.enumerate()
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.map(|(i, field)| {
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Field {
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ident: field.ident.clone(),
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attrs: attr::Field::from_ast(cx, i, field),
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ty: &field.ty,
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}
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})
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.collect()
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}
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