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generic_path.rs
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generic_path.rs
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use std::io::Write;
use std::ops::Deref;
use syn;
use bindgen::config::{Config, Language};
use bindgen::declarationtyperesolver::{DeclarationType, DeclarationTypeResolver};
use bindgen::ir::{Path, Type};
use bindgen::utilities::IterHelpers;
use bindgen::writer::{Source, SourceWriter};
#[derive(Default, Debug, Clone)]
pub struct GenericParams(pub Vec<Path>);
impl GenericParams {
pub fn new(generics: &syn::Generics) -> Self {
GenericParams(
generics
.params
.iter()
.filter_map(|x| match *x {
syn::GenericParam::Type(syn::TypeParam { ref ident, .. }) => {
Some(Path::new(ident.to_string()))
}
_ => None,
})
.collect(),
)
}
}
impl Deref for GenericParams {
type Target = [Path];
fn deref(&self) -> &[Path] {
&self.0
}
}
impl Source for GenericParams {
fn write<F: Write>(&self, config: &Config, out: &mut SourceWriter<F>) {
if !self.0.is_empty() && config.language == Language::Cxx {
out.write("template<");
for (i, item) in self.0.iter().enumerate() {
if i != 0 {
out.write(", ");
}
write!(out, "typename {}", item);
}
out.write(">");
out.new_line();
}
}
}
#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub struct GenericPath {
path: Path,
export_name: String,
generics: Vec<Type>,
ctype: Option<DeclarationType>,
}
impl GenericPath {
pub fn new(path: Path, generics: Vec<Type>) -> Self {
let export_name = path.name().to_owned();
Self {
path,
export_name,
generics,
ctype: None,
}
}
pub fn replace_self_with(&mut self, self_ty: &Path) {
if self.path.replace_self_with(self_ty) {
self.export_name = self_ty.name().to_owned();
}
for ty in &mut self.generics {
ty.replace_self_with(self_ty);
}
}
pub fn path(&self) -> &Path {
&self.path
}
pub fn generics(&self) -> &[Type] {
&self.generics
}
pub fn ctype(&self) -> Option<&DeclarationType> {
self.ctype.as_ref()
}
pub fn name(&self) -> &str {
self.path.name()
}
pub fn export_name(&self) -> &str {
&self.export_name
}
pub fn rename_for_config(&mut self, config: &Config, generic_params: &GenericParams) {
for generic in &mut self.generics {
generic.rename_for_config(config, generic_params);
}
if !generic_params.contains(&self.path) {
config.export.rename(&mut self.export_name);
}
}
pub fn resolve_declaration_types(&mut self, resolver: &DeclarationTypeResolver) {
self.ctype = resolver.type_for(&self.path);
}
pub fn load(path: &syn::Path) -> Result<Self, String> {
assert!(
!path.segments.is_empty(),
"{:?} doesn't have any segments",
path
);
let last_segment = path.segments.last().unwrap();
let name = last_segment.ident.to_string();
let path = Path::new(name);
let phantom_data_path = Path::new("PhantomData");
if path == phantom_data_path {
return Ok(Self::new(path, Vec::new()));
}
let generics = match last_segment.arguments {
syn::PathArguments::AngleBracketed(syn::AngleBracketedGenericArguments {
ref args,
..
}) => args.iter().try_skip_map(|x| match *x {
syn::GenericArgument::Type(ref x) => Type::load(x),
syn::GenericArgument::Lifetime(_) => Ok(None),
_ => Err(format!("can't handle generic argument {:?}", x)),
})?,
syn::PathArguments::Parenthesized(_) => {
return Err("Path contains parentheses.".to_owned());
}
_ => Vec::new(),
};
Ok(Self::new(path, generics))
}
}