forked from M-Labs/nac3
directly impl Fold<()> for InferenceContext
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94ffe4dac2
commit
c7051fcc22
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@ -8,8 +8,7 @@ use crate::typecheck::primitives;
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use rustpython_parser::ast;
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use rustpython_parser::ast::fold::Fold;
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struct Premapper;
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impl ast::fold::Fold<()> for Premapper {
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impl<'a> ast::fold::Fold<()> for InferenceContext<'a> {
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type TargetU = Option<Type>;
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type Error = String;
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@ -18,26 +17,11 @@ impl ast::fold::Fold<()> for Premapper {
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}
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fn fold_expr(&mut self, node: ast::Expr<()>) -> Result<ast::Expr<Self::TargetU>, Self::Error> {
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ast::fold::fold_expr(self, node)
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}
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}
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impl<'a> ast::fold::Fold<Option<Type>> for InferenceContext<'a> {
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type TargetU = Option<Type>;
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type Error = String;
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fn map_user(&mut self, user: Option<Type>) -> Result<Self::TargetU, Self::Error> {
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Ok(user)
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}
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fn fold_expr(&mut self, node: ast::Expr<Option<Type>>) -> Result<ast::Expr<Self::TargetU>, Self::Error> {
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assert_eq!(node.custom, None);
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// assert_eq!(node.custom, None);
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// pre-fold
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let mut expr = node;
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expr = match &expr.node {
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ast::ExprKind::ListComp { .. } => self.fold_listcomp(expr)?,
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_ => rustpython_parser::ast::fold::fold_expr(self, expr)?
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let expr = match &node.node {
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ast::ExprKind::ListComp { .. } => self.fold_listcomp(node)?,
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_ => rustpython_parser::ast::fold::fold_expr(self, node)?
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};
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Ok(ast::Expr {
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@ -55,7 +39,7 @@ impl<'a> ast::fold::Fold<Option<Type>> for InferenceContext<'a> {
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ast::ExprKind::Call {func, args, keywords} => self.infer_call(func, args, keywords),
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ast::ExprKind::Subscript {value, slice, ctx: _} => self.infer_subscript(value, slice),
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ast::ExprKind::IfExp {test, body, orelse} => self.infer_if_expr(test, body, orelse),
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ast::ExprKind::ListComp {elt: _, generators: _} => Ok(expr.custom), // already folded
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ast::ExprKind::ListComp {elt: _, generators: _} => panic!("should not earch here, the list comp should be folded before"), // already folded
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ast::ExprKind::Slice { .. } => Ok(None), // special handling for slice, which is supported
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_ => Err("not supported yet".into())
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}?,
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@ -332,7 +316,7 @@ impl<'a> InferenceContext<'a> {
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}
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// some pre-folds need special handling
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fn fold_listcomp(&mut self, expr: ast::Expr<Option<Type>>) -> Result<ast::Expr<Option<Type>>, String> {
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fn fold_listcomp(&mut self, expr: ast::Expr<()>) -> Result<ast::Expr<Option<Type>>, String> {
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if let ast::Expr {
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location,
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custom: _,
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@ -348,29 +332,25 @@ impl<'a> InferenceContext<'a> {
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return Err("async is not supported".into());
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}
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// fold iter first since it does not contain new identifiers
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let gen_first_folded = ast::Comprehension {
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target: gen.target,
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iter: Box::new(self.fold_expr(*gen.iter)?), // fold here
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ifs: gen.ifs,
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is_async: gen.is_async
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};
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let ast::Comprehension {iter,
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target,
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ifs,
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is_async} = gen;
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let iter_folded = Box::new(self.fold_expr(*iter)?);
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if let TypeEnum::ParametricType(
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primitives::LIST_TYPE,
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ls) = gen_first_folded
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.iter
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ls) = iter_folded
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.custom
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.as_ref()
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.ok_or_else(|| "no value".to_string())?
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.as_ref()
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.clone() {
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self.with_scope(|ctx| -> Result<ast::Expr<Option<Type>>, String> {
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ctx.infer_simple_binding(&gen_first_folded.target, ls[0].clone())?;
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ctx.infer_simple_binding(&target, ls[0].clone())?;
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let elt_folded = Box::new(ctx.fold_expr(*elt)?);
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let target_folded = Box::new(ctx.fold_expr(*gen_first_folded.target)?);
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let ifs_folded = gen_first_folded
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.ifs
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let target_folded = Box::new(ctx.fold_expr(*target)?);
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let ifs_folded = ifs
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.into_iter()
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.map(|x| ctx.fold_expr(x))
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.collect::<Result<Vec<ast::Expr<Option<Type>>>, _>>()?;
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@ -391,8 +371,8 @@ impl<'a> InferenceContext<'a> {
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generators: vec![ast::Comprehension {
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target: target_folded,
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ifs: ifs_folded,
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iter: gen_first_folded.iter,
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is_async: gen_first_folded.is_async
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iter: iter_folded,
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is_async: is_async
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}]
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}
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})
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@ -408,7 +388,7 @@ impl<'a> InferenceContext<'a> {
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}
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}
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fn infer_simple_binding(&mut self, name: &ast::Expr<Option<Type>>, ty: Type) -> Result<(), String> {
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fn infer_simple_binding<T>(&mut self, name: &ast::Expr<T>, ty: Type) -> Result<(), String> {
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match &name.node {
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ast::ExprKind::Name {id, ctx: _} => {
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if id == "_" {
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@ -445,7 +425,6 @@ pub struct ExpressionInferencer<'a> {
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}
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impl<'a> ExpressionInferencer<'a> {
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pub fn fold_expr(&mut self, expr: ast::Expr) -> Result<ast::Expr<Option<Type>>, String> {
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let expr = Premapper.fold_expr(expr)?;
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self.ctx.fold_expr(expr)
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}
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}
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@ -653,7 +632,7 @@ pub mod test {
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let ast12 = rustpython_parser::parser::parse_expression("(1, True, 3, False)[1]").unwrap();
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let folded = inf.fold_expr(ast1).unwrap();
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let folded_2 = Premapper.fold_expr(ast2).unwrap();
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let folded_2 = inf.fold_expr(ast2).unwrap();
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let folded_3 = inf.fold_expr(ast3).unwrap();
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let folded_4 = inf.fold_expr(ast4).unwrap();
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let folded_5 = inf.fold_expr(ast5).unwrap();
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@ -677,6 +656,5 @@ pub mod test {
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println!("{:?}", folded_10.custom);
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println!("{:?}", folded_11.custom);
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println!("{:?}", folded_12.custom);
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}
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}
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