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use super::error::{GenError, GenResult};
use super::*;
impl Codegen {
pub(super) fn generate_pat(&self, node: &IrNode) -> GenResult<TokenStream> {
match node {
IrNode::BindingIdent {
name,
type_ann,
optional: _,
..
} => {
let name_code = self.generate_ident(name)?;
let type_ann_code = match type_ann.as_ref() {
Some(t) => {
let tc = self.generate_type_ann(t)?;
quote! { Some(Box::new(#tc)) }
}
None => quote! { None },
};
Ok(quote! {
macroforge_ts::swc_core::ecma::ast::Pat::Ident(
macroforge_ts::swc_core::ecma::ast::BindingIdent {
id: #name_code,
type_ann: #type_ann_code,
}
)
})
}
IrNode::Ident { value: name, .. } => Ok(quote! {
macroforge_ts::swc_core::ecma::ast::Pat::Ident(
macroforge_ts::swc_core::ecma::ast::BindingIdent {
id: macroforge_ts::swc_core::ecma::ast::Ident::new_no_ctxt(
#name.into(),
macroforge_ts::swc_core::common::DUMMY_SP,
),
type_ann: None,
}
)
}),
IrNode::Placeholder { kind, expr, .. } => {
match kind {
PlaceholderKind::Ident => Ok(quote! {
macroforge_ts::swc_core::ecma::ast::Pat::Ident(
macroforge_ts::swc_core::ecma::ast::BindingIdent {
id: macroforge_ts::ts_syn::ToTsIdent::to_ts_ident((#expr).clone()),
type_ann: None,
}
)
}),
PlaceholderKind::Expr => {
// Expressions can be patterns too (like member expressions for assignment)
Ok(quote! {
macroforge_ts::swc_core::ecma::ast::Pat::Expr(
Box::new(macroforge_ts::ts_syn::ToTsExpr::to_ts_expr((#expr).clone()))
)
})
}
_ => Err(GenError::invalid_placeholder(
"pattern",
&format!("{:?}", kind),
&["Ident", "Expr"],
)),
}
}
IrNode::IdentBlock { parts, .. } => {
// Build identifier string from parts at runtime
let part_exprs: Vec<TokenStream> = parts
.iter()
.filter_map(|p| match p {
IrNode::StrLit { value: text, .. } => Some(quote! { __ident.push_str(#text); }),
IrNode::Ident { value: text, .. } => Some(quote! { __ident.push_str(#text); }),
IrNode::Placeholder { expr, .. } => {
Some(quote! {
__ident.push_str(¯oforge_ts::ts_syn::ToTsIdent::to_ts_ident((#expr).clone()).sym.to_string());
})
}
_ => None,
})
.collect();
Ok(quote! {
{
let mut __ident = String::new();
#(#part_exprs)*
macroforge_ts::swc_core::ecma::ast::Pat::Ident(
macroforge_ts::swc_core::ecma::ast::BindingIdent {
id: macroforge_ts::swc_core::ecma::ast::Ident::new_no_ctxt(
__ident.into(),
macroforge_ts::swc_core::common::DUMMY_SP,
),
type_ann: None,
}
)
}
})
}
IrNode::ArrayPat {
elems,
type_ann,
optional,
..
} => {
let elems_code: Vec<TokenStream> = elems
.iter()
.map(|opt_elem| match opt_elem {
Some(elem) => {
let elem_code = self.generate_pat(elem)?;
Ok(quote! { Some(#elem_code) })
}
None => Ok(quote! { None }),
})
.collect::<GenResult<Vec<_>>>()?;
let type_ann_code = match type_ann.as_ref() {
Some(t) => {
let tc = self.generate_type_ann(t)?;
quote! { Some(Box::new(#tc)) }
}
None => quote! { None },
};
Ok(quote! {
macroforge_ts::swc_core::ecma::ast::Pat::Array(
macroforge_ts::swc_core::ecma::ast::ArrayPat {
span: macroforge_ts::swc_core::common::DUMMY_SP,
elems: vec![#(#elems_code),*],
optional: #optional,
type_ann: #type_ann_code,
}
)
})
}
IrNode::ObjectPat {
props,
type_ann,
optional,
..
} => {
let props_code: Vec<TokenStream> = props
.iter()
.map(|prop| self.generate_object_pat_prop(prop))
.collect::<GenResult<Vec<_>>>()?;
let type_ann_code = match type_ann.as_ref() {
Some(t) => {
let tc = self.generate_type_ann(t)?;
quote! { Some(Box::new(#tc)) }
}
None => quote! { None },
};
Ok(quote! {
macroforge_ts::swc_core::ecma::ast::Pat::Object(
macroforge_ts::swc_core::ecma::ast::ObjectPat {
span: macroforge_ts::swc_core::common::DUMMY_SP,
props: vec![#(#props_code),*],
optional: #optional,
type_ann: #type_ann_code,
}
)
})
}
IrNode::RestPat { arg, type_ann, .. } => {
let arg_code = self.generate_pat(arg)?;
let type_ann_code = match type_ann.as_ref() {
Some(t) => {
let tc = self.generate_type_ann(t)?;
quote! { Some(Box::new(#tc)) }
}
None => quote! { None },
};
Ok(quote! {
macroforge_ts::swc_core::ecma::ast::Pat::Rest(
macroforge_ts::swc_core::ecma::ast::RestPat {
span: macroforge_ts::swc_core::common::DUMMY_SP,
dot3_token: macroforge_ts::swc_core::common::DUMMY_SP,
arg: Box::new(#arg_code),
type_ann: #type_ann_code,
}
)
})
}
IrNode::AssignPat { left, right, .. } => {
let left_code = self.generate_pat(left)?;
let right_code = self.generate_expr(right)?;
Ok(quote! {
macroforge_ts::swc_core::ecma::ast::Pat::Assign(
macroforge_ts::swc_core::ecma::ast::AssignPat {
span: macroforge_ts::swc_core::common::DUMMY_SP,
left: Box::new(#left_code),
right: Box::new(#right_code),
}
)
})
}
_ => Err(GenError::unexpected_node(
"pattern",
node,
&[
"BindingIdent",
"Ident",
"Placeholder",
"IdentBlock",
"ArrayPat",
"ObjectPat",
"RestPat",
"AssignPat",
],
)),
}
}
/// Generate code for an object pattern property.
pub(super) fn generate_object_pat_prop(&self, node: &IrNode) -> GenResult<TokenStream> {
match node {
IrNode::ObjectPatProp { key, value, .. } => {
let key_code = self.generate_ident(key)?;
match value {
Some(val) => {
let val_code = self.generate_pat(val)?;
Ok(quote! {
macroforge_ts::swc_core::ecma::ast::ObjectPatProp::KeyValue(
macroforge_ts::swc_core::ecma::ast::KeyValuePatProp {
key: macroforge_ts::swc_core::ecma::ast::PropName::Ident(
macroforge_ts::swc_core::ecma::ast::IdentName::new(
#key_code.sym.clone(),
macroforge_ts::swc_core::common::DUMMY_SP,
)
),
value: Box::new(#val_code),
}
)
})
}
None => {
// Shorthand: { a } is the same as { a: a }
Ok(quote! {
macroforge_ts::swc_core::ecma::ast::ObjectPatProp::Assign(
macroforge_ts::swc_core::ecma::ast::AssignPatProp {
span: macroforge_ts::swc_core::common::DUMMY_SP,
key: #key_code,
value: None,
}
)
})
}
}
}
IrNode::RestPat { arg, type_ann, .. } => {
let arg_code = self.generate_pat(arg)?;
let type_ann_code = match type_ann.as_ref() {
Some(t) => {
let tc = self.generate_type_ann(t)?;
quote! { Some(Box::new(#tc)) }
}
None => quote! { None },
};
Ok(quote! {
macroforge_ts::swc_core::ecma::ast::ObjectPatProp::Rest(
macroforge_ts::swc_core::ecma::ast::RestPat {
span: macroforge_ts::swc_core::common::DUMMY_SP,
dot3_token: macroforge_ts::swc_core::common::DUMMY_SP,
arg: Box::new(#arg_code),
type_ann: #type_ann_code,
}
)
})
}
_ => Err(GenError::unexpected_node(
"object pattern property",
node,
&["ObjectPatProp", "RestPat"],
)),
}
}
pub(super) fn generate_pats(&self, nodes: &[IrNode]) -> GenResult<TokenStream> {
let pats_code: Vec<TokenStream> = nodes
.iter()
.map(|p| self.generate_pat(p))
.collect::<GenResult<Vec<_>>>()?;
Ok(quote! { vec![#(#pats_code),*] })
}
}