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|
use super::r#struct::{make_field, ResolvedFields};
use super::{CodeGen, Error};
use crate::cg::{self};
use crate::ir;
use std::io::{self, Write};
impl CodeGen {
pub(super) fn resolve_error(
&mut self,
name: String,
number: i32,
fields: Vec<ir::Field>,
_doc: Option<ir::Doc>,
) {
let fields = {
let mut ff = vec![
make_field("response_type".into(), "CARD8".into()),
make_field("error_code".into(), "CARD8".into()),
make_field("sequence".into(), "CARD16".into()),
];
for f in fields.into_iter() {
ff.push(f);
}
ff
};
let variant = cg::rust_type_name(&name);
let rs_typ = variant.clone() + "Error";
let ResolvedFields {
fields, wire_sz, ..
} = self.resolv_struct_fields(&rs_typ, "", &fields, None);
self.rs_typs_need_count.insert(rs_typ.clone(), 1);
self.errors.push(Error {
rs_typ,
copy_from_rs_typ: None,
variant,
number,
fields,
wire_sz,
});
}
pub(super) fn resolve_errorcopy(&mut self, name: String, number: i32, r#ref: String) {
let variant = cg::rust_type_name(&name);
let rs_typ = variant.clone() + "Error";
let (ref_module, ref_variant) = self.extract_module(&r#ref);
let ref_variant = cg::rust_variant_name(ref_variant);
let mut implicit_module = None;
let error = match &ref_module {
Some(module) => {
let di = self
.depinfo
.iter()
.find(|di| di.xcb_mod == *module)
.unwrap_or_else(|| panic!("could not find {} dependency", module));
di.errors
.iter()
.find(|e| e.variant == ref_variant)
.unwrap_or_else(|| panic!("could not find error {}::{}", module, ref_variant))
}
None => self
.errors
.iter()
.find(|e| e.variant == ref_variant)
.or_else(|| {
for di in &self.depinfo {
for err in &di.errors {
if err.variant == ref_variant {
implicit_module = Some(di.xcb_mod.clone());
return Some(err);
}
}
}
None
})
.unwrap_or_else(|| {
panic!(
"{}: cannot find error {} referenced by {}",
self.xcb_mod, r#ref, name
)
}),
}
.clone();
self.errors.push(Error {
rs_typ,
variant,
number,
copy_from_rs_typ: Some(error.rs_typ),
fields: error.fields,
wire_sz: error.wire_sz,
});
}
pub(crate) fn emit_errors<O: Write>(&self, out: &mut O) -> io::Result<()> {
if self.errors.is_empty() {
return Ok(());
}
for error in &self.errors {
if let Some(copy_from_rs_typ) = &error.copy_from_rs_typ {
let prefix = if copy_from_rs_typ == "ValueError" && self.xcb_mod != "xproto" {
"xproto::"
} else {
""
};
writeln!(out)?;
writeln!(out, "/// The `{}` error.", error.rs_typ)?;
writeln!(
out,
"pub type {} = {}{};",
error.rs_typ, prefix, copy_from_rs_typ
)?;
continue;
}
// Event are struct holding a pointer.
// They own the data pointed to that must be freed during drop.
writeln!(out)?;
writeln!(out, "/// The `{}` error.", error.rs_typ)?;
writeln!(out, "pub struct {} {{", error.rs_typ)?;
writeln!(out, " raw: *mut xcb_generic_error_t,")?;
writeln!(out, "}}")?;
writeln!(out)?;
writeln!(
out,
"impl base::Raw<xcb_generic_error_t> for {} {{",
error.rs_typ
)?;
writeln!(
out,
" unsafe fn from_raw(raw: *mut xcb_generic_error_t) -> Self {{ {} {{ raw }} }}",
error.rs_typ
)?;
writeln!(out)?;
writeln!(out, " fn as_raw(&self) -> *mut xcb_generic_error_t {{")?;
writeln!(out, " self.raw")?;
writeln!(out, " }}")?;
writeln!(out, "}}")?;
writeln!(out)?;
writeln!(out, "impl base::BaseError for {} {{", error.rs_typ)?;
if let Some(ext_info) = self.ext_info.as_ref() {
writeln!(
out,
" const EXTENSION: std::option::Option<ext::Extension> = Some(ext::Extension::{});",
ext_info.rs_name
)?;
} else {
writeln!(
out,
" const EXTENSION: std::option::Option<ext::Extension> = None;"
)?;
}
writeln!(out)?;
if error.number >= 0 {
writeln!(out, " const NUMBER: u32 = {};", error.number)?;
} else {
writeln!(out, " const NUMBER: u32 = u32::MAX;")?;
}
writeln!(out, "}}")?;
writeln!(out)?;
writeln!(out, "impl {} {{", error.rs_typ)?;
writeln!(
out,
" fn wire_ptr(&self) -> *const u8 {{ self.raw as *const u8 }}"
)?;
writeln!(out)?;
writeln!(out, " fn wire_len(&self) -> usize {{ 32 }}")?;
self.emit_struct_accessors(out, &error.rs_typ, &error.fields)?;
writeln!(out, "}}")?;
self.emit_debug_impl(out, &error.rs_typ, &error.fields)?;
writeln!(out)?;
writeln!(out, "impl Drop for {} {{", error.rs_typ)?;
writeln!(out, " fn drop(&mut self) {{")?;
writeln!(out, " unsafe {{ libc::free(self.raw as *mut _); }}")?;
writeln!(out, " }}")?;
writeln!(out, "}}")?;
writeln!(out)?;
writeln!(out, "unsafe impl Send for {} {{}}", error.rs_typ)?;
writeln!(out, "unsafe impl Sync for {} {{}}", error.rs_typ)?;
}
writeln!(out)?;
if let Some(ext_info) = &self.ext_info {
writeln!(
out,
"/// Unified error type for the {} extension",
ext_info.rs_name
)?;
} else {
writeln!(out, "/// Unified error type for the X core protocol")?;
}
writeln!(out, "#[derive(Debug)]")?;
writeln!(out, "pub enum Error {{")?;
for error in &self.errors {
writeln!(out, " {}({}),", error.variant, error.rs_typ)?;
}
writeln!(out, "}}")?;
writeln!(out)?;
writeln!(out, "impl Error {{")?;
writeln!(out, " pub fn as_raw(&self) -> *mut xcb_generic_error_t {{")?;
writeln!(out, " match self {{")?;
for error in &self.errors {
writeln!(out, " Self::{}(e) => e.as_raw(),", error.variant)?;
}
writeln!(out, " }}")?;
writeln!(out, " }}")?;
writeln!(out, "}}")?;
self.emit_resolve_wire_error(out)?;
Ok(())
}
fn emit_resolve_wire_error<O: Write>(&self, out: &mut O) -> io::Result<()> {
writeln!(out)?;
writeln!(out, "impl base::ResolveWireError for Error {{")?;
writeln!(out, "{}unsafe fn resolve_wire_error(first_error: u8, raw: *mut xcb_generic_error_t) -> std::option::Option<Self> {{", cg::ind(1))?;
writeln!(out, "{}debug_assert!(!raw.is_null());", cg::ind(2))?;
writeln!(out, "{}let error_code = (*raw).error_code;", cg::ind(2))?;
writeln!(out, "{}match error_code - first_error {{", cg::ind(2))?;
for error in &self.errors {
if error.number < 0 {
continue;
}
writeln!(
out,
"{}{} => std::option::Option::Some(Error::{}({}::from_raw(raw))),",
cg::ind(3),
error.number,
error.variant,
error.rs_typ
)?;
}
writeln!(out, "{}_ => std::option::Option::None,", cg::ind(3))?;
writeln!(out, "{}}}", cg::ind(2))?;
writeln!(out, "{}}}", cg::ind(1))?;
writeln!(out, "}}")?;
Ok(())
}
}
|
