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Stop generating visit_usize and visit_bytes for FieldVisitor

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This commit is contained in:
David Tolnay
2017-01-08 00:59:18 -08:00
parent 4193122472
commit 516cc8b04e
2 changed files with 11 additions and 97 deletions
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serde_codegen/src/de.rs
+11 -83
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@@ -1,5 +1,5 @@
use syn::{self, aster};
use quote::{self, Tokens};
use quote::Tokens;
use bound;
use internals::ast::{Body, Field, Item, Style, Variant};
@@ -652,38 +652,6 @@ fn deserialize_field_visitor(
Some(quote!(__ignore,))
};
let index_field_arms: Vec<_> = field_idents.iter()
.enumerate()
.map(|(field_index, field_ident)| {
quote! {
#field_index => { Ok(__Field::#field_ident) }
}
})
.collect();
let (index_error_msg, unknown_ident) = if is_variant {
("expected a variant", aster::id("unknown_variant"))
} else {
("expected a field", aster::id("unknown_field"))
};
let fallthrough_index_arm_expr = if !is_variant && !item_attrs.deny_unknown_fields() {
quote! {
Ok(__Field::__ignore)
}
} else {
quote! {
Err(_serde::de::Error::invalid_value(#index_error_msg))
}
};
let index_body = quote! {
match value {
#(#index_field_arms)*
_ => #fallthrough_index_arm_expr
}
};
// Match arms to extract a field from a string
let str_field_arms: Vec<_> = field_idents.iter().zip(field_names.iter())
.map(|(field_ident, field_name)| {
@@ -693,49 +661,18 @@ fn deserialize_field_visitor(
})
.collect();
let fallthrough_str_arm_expr = if !is_variant && !item_attrs.deny_unknown_fields() {
let fallthrough_str_arm_expr = if is_variant {
quote! {
Ok(__Field::__ignore)
Err(_serde::de::Error::unknown_variant(value))
}
} else if item_attrs.deny_unknown_fields() {
quote! {
Err(_serde::de::Error::unknown_field(value))
}
} else {
quote! {
Err(_serde::de::Error::#unknown_ident(value))
}
};
let str_body = quote! {
match value {
#(#str_field_arms)*
_ => #fallthrough_str_arm_expr
}
};
// Match arms to extract a field from a string
let bytes_field_arms: Vec<_> = field_idents.iter().zip(field_names.iter())
.map(|(field_ident, field_name)| {
let bytes_field_name = quote::ByteStr(field_name);
quote! {
#bytes_field_name => { Ok(__Field::#field_ident) }
}
})
.collect();
let fallthrough_bytes_arm_expr = if !is_variant && !item_attrs.deny_unknown_fields() {
quote! {
Ok(__Field::__ignore)
}
} else {
quote!({
let value = ::std::string::String::from_utf8_lossy(value);
Err(_serde::de::Error::#unknown_ident(&value))
})
};
let bytes_body = quote! {
match value {
#(#bytes_field_arms)*
_ => #fallthrough_bytes_arm_expr
}
};
quote! {
@@ -755,22 +692,13 @@ fn deserialize_field_visitor(
impl _serde::de::Visitor for __FieldVisitor {
type Value = __Field;
fn visit_usize<__E>(&mut self, value: usize) -> ::std::result::Result<__Field, __E>
where __E: _serde::de::Error
{
#index_body
}
fn visit_str<__E>(&mut self, value: &str) -> ::std::result::Result<__Field, __E>
where __E: _serde::de::Error
{
#str_body
}
fn visit_bytes<__E>(&mut self, value: &[u8]) -> ::std::result::Result<__Field, __E>
where __E: _serde::de::Error
{
#bytes_body
match value {
#(#str_field_arms)*
_ => #fallthrough_str_arm_expr
}
}
}