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use crate::*;
#[derive(Clone, Debug)]
pub struct Type {
pub comment: Option<&'static str>,
pub example: Option<Example>,
pub metas: Metas,
/// When we have an adjacently-tagged enum, this field contains name of the
/// field that should represent that enum's tag.
pub tag: Option<&'static str>,
/// Whether this type is serializable or not (think
/// `#[serde(skip_serializing)]`).
pub serializable: bool,
/// Whether this type is deserializable or not (think
/// `#[serde(skip_deserializing)]`).
pub deserializable: bool,
// Keeping the kind last improves legibility of debug-printing
pub kind: TypeKind,
}
impl From<TypeKind> for Type {
fn from(kind: TypeKind) -> Self {
Self {
comment: None,
example: None,
metas: Metas::default(),
tag: None,
serializable: true,
deserializable: true,
kind,
}
}
}
impl From<Fields> for Type {
fn from(fields: Fields) -> Self {
let kind: TypeKind = fields.into();
kind.into()
}
}
impl Type {
/// Recursively walks through the current type, and when an enum is found,
/// all its variants are converted to equivalent structs.
pub(crate) fn enum_to_structs(&self) -> Option<Vec<Self>> {
match &self.kind {
TypeKind::Enum {
tag: Tag::Adjacent { tag, content },
variants,
} => Some(
variants
.iter()
.map(|variant| {
self.to_owned()
.adjacent_variant_to_struct(variant, tag, content)
})
.collect(),
),
TypeKind::Enum {
tag: Tag::Internal { tag },
variants,
} => Some(
variants
.iter()
.map(|variant| {
self.to_owned().internal_variant_to_struct(variant, tag)
})
.collect(),
),
TypeKind::Enum {
tag: Tag::External,
variants,
} => Some(
variants
.iter()
.map(|variant| {
self.to_owned().external_variant_to_struct(variant)
})
.collect(),
),
TypeKind::Enum {
tag: Tag::None,
variants,
} => Some(
variants
.iter()
.map(|variant| {
self.to_owned().untagged_variant_to_struct(variant)
})
.collect(),
),
TypeKind::Array { ty, size } => {
ty.enum_to_structs().map(|mut types| {
types
.drain(..)
.map(|ty| {
self.with_kind(TypeKind::Array {
ty: Box::new(ty),
size: size.to_owned(),
})
})
.collect()
})
}
TypeKind::Map { key, value } => {
value.enum_to_structs().map(|mut types| {
types
.drain(..)
.map(|ty| {
self.with_kind(TypeKind::Map {
key: key.to_owned(),
value: Box::new(ty),
})
})
.collect()
})
}
TypeKind::Optional { ty } => {
ty.enum_to_structs().map(|mut types| {
types
.drain(..)
.map(|ty| {
self.with_kind(TypeKind::Optional {
ty: Box::new(ty),
})
})
.collect()
})
}
TypeKind::Struct {
fields: Fields::Named { fields },
..
} => fields.iter().enumerate().find_map(|(i, (name, f))| {
f.ty.enum_to_structs().map(|mut types| {
types
.drain(..)
.map(|ty| {
self.to_owned().replace_named_field_of_struct(
(name, ty.into()),
i,
)
})
.collect()
})
}),
TypeKind::Struct {
fields: Fields::Unnamed { fields },
..
} => fields.iter().enumerate().find_map(|(i, f)| {
f.ty.enum_to_structs().map(|mut types| {
types
.drain(..)
.map(|ty| {
self.to_owned()
.replace_unnamed_field_of_struct(ty.into(), i)
})
.collect()
})
}),
TypeKind::Tuple { fields } => {
fields.iter().enumerate().find_map(|(i, ty)| {
ty.enum_to_structs().map(|mut types| {
types
.drain(..)
.map(|ty| {
self.to_owned().replace_field_of_tuple(ty, i)
})
.collect()
})
})
}
_ => None,
}
}
/// Converts an adjacently tagged variant of an enum to an equivalent struct.
///
/// This is done by creating a struct with the `tag`, `content` fields.
fn adjacent_variant_to_struct(
mut self,
variant: &Variant,
tag: &'static str,
content: &'static str,
) -> Self {
let mut new_fields = Vec::new();
let mut tag_type: Type = TypeKind::String.into();
tag_type.example = Some(Example::Simple(variant.id));
new_fields.push((tag, tag_type.into()));
new_fields.push((content, variant.fields.clone().into()));
self.kind = Fields::Named { fields: new_fields }.into();
self
}
/// Converts an internally tagged variant of an enum to an equivalent struct.
///
/// This is done by creating a struct with the `tag` field, and then
/// appending the fields of the original variant to it.
fn internal_variant_to_struct(
mut self,
variant: &Variant,
tag: &'static str,
) -> Self {
let mut new_fields = Vec::new();
let mut tag_type: Type = TypeKind::String.into();
tag_type.example = Some(Example::Simple(variant.id));
new_fields.push((tag, tag_type.into()));
match variant.fields.clone() {
Fields::Named { mut fields } => new_fields.append(&mut fields),
Fields::Unnamed { .. } => panic!(
"Internally tagged unnamed variants are unsupported in TOML"
),
Fields::Unit => {}
};
self.kind = Fields::Named { fields: new_fields }.into();
self
}
/// Converts an externally tagged variant of an enum to an equivalent struct.
///
/// This is done by creating a struct with just one field, whose name is the
/// name of the variant and its type is another struct with the original
/// fields of the variant.
fn external_variant_to_struct(mut self, variant: &Variant) -> Self {
let mut new_fields = Vec::new();
let new_type: Type = variant.fields.clone().into();
new_fields.push((variant.id, new_type.into()));
self.kind = Fields::Named { fields: new_fields }.into();
self
}
/// Converts an untagged variant of an enum to an equivalent struct.
///
/// This is done by creating a struct that contains the fields of the
/// original variant.
fn untagged_variant_to_struct(mut self, variant: &Variant) -> Self {
self.kind = variant.fields.clone().into();
self
}
fn with_kind(&self, kind: TypeKind) -> Self {
Self {
comment: self.comment,
example: self.example,
metas: self.metas.clone(),
tag: self.tag,
serializable: self.serializable,
deserializable: self.deserializable,
kind,
}
}
fn replace_named_field_of_struct(
mut self,
new_field: (&'static str, Field),
i: usize,
) -> Self {
if let TypeKind::Struct {
fields: Fields::Named { fields },
..
} = &mut self.kind
{
fields[i] = new_field;
}
self
}
fn replace_unnamed_field_of_struct(
mut self,
new_field: Field,
i: usize,
) -> Self {
if let TypeKind::Struct {
fields: Fields::Unnamed { fields },
..
} = &mut self.kind
{
fields[i] = new_field;
}
self
}
fn replace_field_of_tuple(mut self, new_field: Type, i: usize) -> Self {
if let TypeKind::Tuple { fields } = &mut self.kind {
fields[i] = new_field;
}
self
}
}