/
font_imports_generator.rs
269 lines (249 loc) · 10.6 KB
/
font_imports_generator.rs
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use next_binding::swc::core::common::errors::HANDLER;
use next_binding::swc::core::common::{Spanned, DUMMY_SP};
use next_binding::swc::core::ecma::ast::*;
use next_binding::swc::core::ecma::atoms::JsWord;
use next_binding::swc::core::ecma::visit::{noop_visit_type, Visit};
use serde_json::Value;
pub struct FontImportsGenerator<'a> {
pub state: &'a mut super::State,
pub relative_path: &'a str,
}
impl<'a> FontImportsGenerator<'a> {
fn check_call_expr(
&mut self,
call_expr: &CallExpr,
variable_name: &Result<Ident, &Pat>,
) -> Option<ImportDecl> {
if let Callee::Expr(callee_expr) = &call_expr.callee {
if let Expr::Ident(ident) = &**callee_expr {
if let Some(font_function) = self.state.font_functions.get(&ident.to_id()) {
self.state
.font_functions_in_allowed_scope
.insert(ident.span.lo);
let json: Result<Vec<Value>, ()> = call_expr
.args
.iter()
.map(|expr_or_spread| {
if let Some(span) = expr_or_spread.spread {
HANDLER.with(|handler| {
handler
.struct_span_err(span, "Font loaders don't accept spreads")
.emit()
});
}
expr_to_json(&expr_or_spread.expr)
})
.collect();
if let Ok(json) = json {
let function_name = match &font_function.function_name {
Some(function) => String::from(&**function),
None => String::new(),
};
let mut query_json_values = serde_json::Map::new();
query_json_values.insert(
String::from("path"),
Value::String(self.relative_path.to_string()),
);
query_json_values
.insert(String::from("import"), Value::String(function_name));
query_json_values.insert(String::from("arguments"), Value::Array(json));
if let Ok(ident) = variable_name {
query_json_values.insert(
String::from("variableName"),
Value::String(ident.sym.to_string()),
);
}
let query_json = Value::Object(query_json_values);
return Some(ImportDecl {
src: Box::new(Str {
value: JsWord::from(format!(
"{}/target.css?{}",
font_function.loader, query_json
)),
raw: None,
span: DUMMY_SP,
}),
specifiers: vec![],
type_only: false,
asserts: None,
span: DUMMY_SP,
});
}
}
}
}
None
}
fn check_var_decl(&mut self, var_decl: &VarDecl) -> Option<Ident> {
if let Some(decl) = var_decl.decls.get(0) {
let ident = match &decl.name {
Pat::Ident(ident) => Ok(ident.id.clone()),
pattern => Err(pattern),
};
if let Some(expr) = &decl.init {
if let Expr::Call(call_expr) = &**expr {
let import_decl = self.check_call_expr(call_expr, &ident);
if let Some(mut import_decl) = import_decl {
match var_decl.kind {
VarDeclKind::Const => {}
_ => {
HANDLER.with(|handler| {
handler
.struct_span_err(
var_decl.span,
"Font loader calls must be assigned to a const",
)
.emit()
});
}
}
match ident {
Ok(ident) => {
import_decl.specifiers =
vec![ImportSpecifier::Default(ImportDefaultSpecifier {
span: DUMMY_SP,
local: ident.clone(),
})];
self.state
.font_imports
.push(ModuleItem::ModuleDecl(ModuleDecl::Import(import_decl)));
return Some(ident);
}
Err(pattern) => {
HANDLER.with(|handler| {
handler
.struct_span_err(
pattern.span(),
"Font loader calls must be assigned to an identifier",
)
.emit()
});
}
}
}
}
}
}
None
}
}
impl<'a> Visit for FontImportsGenerator<'a> {
noop_visit_type!();
fn visit_module_item(&mut self, item: &ModuleItem) {
match item {
ModuleItem::Stmt(Stmt::Decl(Decl::Var(var_decl))) => {
if self.check_var_decl(var_decl).is_some() {
self.state.removeable_module_items.insert(var_decl.span.lo);
}
}
ModuleItem::ModuleDecl(ModuleDecl::ExportDecl(export_decl)) => {
if let Decl::Var(var_decl) = &export_decl.decl {
if let Some(ident) = self.check_var_decl(var_decl) {
self.state
.removeable_module_items
.insert(export_decl.span.lo);
self.state.font_exports.push(ModuleItem::ModuleDecl(
ModuleDecl::ExportNamed(NamedExport {
span: DUMMY_SP,
specifiers: vec![ExportSpecifier::Named(ExportNamedSpecifier {
orig: ModuleExportName::Ident(ident),
span: DUMMY_SP,
exported: None,
is_type_only: false,
})],
src: None,
type_only: false,
asserts: None,
}),
));
}
}
}
_ => {}
}
}
}
fn object_lit_to_json(object_lit: &ObjectLit) -> Value {
let mut values = serde_json::Map::new();
for prop in &object_lit.props {
match prop {
PropOrSpread::Prop(prop) => match &**prop {
Prop::KeyValue(key_val) => {
let key = match &key_val.key {
PropName::Ident(ident) => Ok(String::from(&*ident.sym)),
key => {
HANDLER.with(|handler| {
handler
.struct_span_err(key.span(), "Unexpected object key type")
.emit()
});
Err(())
}
};
let val = expr_to_json(&key_val.value);
if let (Ok(key), Ok(val)) = (key, val) {
values.insert(key, val);
}
}
key => HANDLER.with(|handler| {
handler.struct_span_err(key.span(), "Unexpected key").emit();
}),
},
PropOrSpread::Spread(spread_span) => HANDLER.with(|handler| {
handler
.struct_span_err(spread_span.dot3_token, "Unexpected spread")
.emit();
}),
}
}
Value::Object(values)
}
fn expr_to_json(expr: &Expr) -> Result<Value, ()> {
match expr {
Expr::Lit(Lit::Str(str)) => Ok(Value::String(String::from(&*str.value))),
Expr::Lit(Lit::Bool(Bool { value, .. })) => Ok(Value::Bool(*value)),
Expr::Lit(Lit::Num(Number { value, .. })) => {
Ok(Value::Number(serde_json::Number::from_f64(*value).unwrap()))
}
Expr::Object(object_lit) => Ok(object_lit_to_json(object_lit)),
Expr::Array(ArrayLit {
elems,
span: array_span,
..
}) => {
let elements: Result<Vec<Value>, ()> = elems
.iter()
.map(|e| {
if let Some(expr) = e {
match expr.spread {
Some(spread_span) => HANDLER.with(|handler| {
handler
.struct_span_err(spread_span, "Unexpected spread")
.emit();
Err(())
}),
None => expr_to_json(&expr.expr),
}
} else {
HANDLER.with(|handler| {
handler
.struct_span_err(*array_span, "Unexpected empty value in array")
.emit();
Err(())
})
}
})
.collect();
elements.map(Value::Array)
}
lit => HANDLER.with(|handler| {
handler
.struct_span_err(
lit.span(),
"Font loader values must be explicitly written literals.",
)
.emit();
Err(())
}),
}
}