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|
use super::*;
pub fn writer(writer: &Writer, def: Field) -> TokenStream {
let name = to_ident(writer.reader.field_name(def));
let ty = writer.reader.field_type(def, None).to_const_type();
let cfg = field_cfg(writer.reader, def);
let doc = writer.cfg_doc(&cfg);
let features = writer.cfg_features(&cfg);
if let Some(constant) = writer.reader.field_constant(def) {
let constant_type = writer.reader.constant_type(constant);
if ty == constant_type {
if ty == Type::String {
let crate_name = writer.crate_name();
if field_is_ansi(writer.reader, def) {
let value = writer.value(&writer.reader.constant_value(constant));
quote! {
#doc
#features
pub const #name: #crate_name PCSTR = #crate_name s!(#value);
}
} else {
let value = writer.value(&writer.reader.constant_value(constant));
quote! {
#doc
#features
pub const #name: #crate_name PCWSTR = #crate_name w!(#value);
}
}
} else {
let value = writer.typed_value(&writer.reader.constant_value(constant));
quote! {
#doc
#features
pub const #name: #value;
}
}
} else {
let kind = writer.type_default_name(&ty);
let value = writer.value(&writer.reader.constant_value(constant));
let underlying_type = type_underlying_type(writer.reader, &ty);
let value = if underlying_type == constant_type {
value
} else if writer.std && underlying_type == Type::ISize {
quote! { ::core::ptr::invalid_mut(#value as _) }
} else {
quote! { #value as _ }
};
if !writer.sys && type_has_replacement(writer.reader, &ty) {
quote! {
#doc
#features
pub const #name: #kind = #kind(#value);
}
} else {
quote! {
#doc
#features
pub const #name: #kind = #value;
}
}
}
} else if let Some(guid) = field_guid(writer.reader, def) {
let value = writer.guid(&guid);
let guid = writer.type_name(&Type::GUID);
quote! {
#doc
pub const #name: #guid = #value;
}
} else if let Some(value) = initializer(writer, def) {
let kind = writer.type_default_name(&ty);
quote! {
#doc
#features
pub const #name: #kind = #kind { #value };
}
} else {
quote! {}
}
}
fn initializer(writer: &Writer, def: Field) -> Option<TokenStream> {
let Some(value) = constant(writer, def) else {
return None;
};
let mut input = value.as_str();
let Type::TypeDef(def, _) = writer.reader.field_type(def, None) else {
unimplemented!();
};
let mut result = quote! {};
for field in writer.reader.type_def_fields(def) {
let (value, rest) = field_initializer(writer, field, input);
input = rest;
result.combine(&value);
}
Some(result)
}
fn field_initializer<'a>(writer: &Writer, field: Field, input: &'a str) -> (TokenStream, &'a str) {
let name = to_ident(writer.reader.field_name(field));
match writer.reader.field_type(field, None) {
Type::GUID => {
let (literals, rest) = read_literal_array(input, 11);
let value = writer.guid(&GUID::from_string_args(&literals));
(quote! { #name: #value, }, rest)
}
Type::Win32Array(_, len) => {
let (literals, rest) = read_literal_array(input, len);
let literals = literals.iter().map(|literal| TokenStream::from(*literal));
(quote! { #name: [#(#literals,)*], }, rest)
}
_ => {
let (literal, rest) = read_literal(input);
let literal: TokenStream = literal.into();
(quote! { #name: #literal, }, rest)
}
}
}
fn constant(writer: &Writer, def: Field) -> Option<String> {
writer.reader.find_attribute(def, "ConstantAttribute").map(|attribute| {
let args = writer.reader.attribute_args(attribute);
match &args[0].1 {
Value::String(value) => value.clone(),
rest => unimplemented!("{rest:?}"),
}
})
}
fn read_literal(input: &str) -> (&str, &str) {
let mut start = None;
let mut end = 0;
for (pos, c) in input.bytes().enumerate() {
if start.is_none() {
if c != b' ' && c != b',' {
start = Some(pos);
}
} else if c == b' ' || c == b',' || c == b'}' {
break;
}
end += 1;
}
let Some(start) = start else {
unimplemented!();
};
(&input[start..end], &input[end..])
}
fn read_token(input: &str, token: u8) -> &str {
for (pos, c) in input.bytes().enumerate() {
if c == token {
return &input[pos + 1..];
} else if c != b' ' && c != b',' {
break;
}
}
panic!("`{}` expected", token.escape_ascii());
}
fn read_literal_array(input: &str, len: usize) -> (Vec<&str>, &str) {
let mut input = read_token(input, b'{');
let mut result = vec![];
for _ in 0..len {
let (literal, rest) = read_literal(input);
result.push(literal);
input = rest;
}
(result, read_token(input, b'}'))
}
|
