629 lines
24 KiB
Rust
629 lines
24 KiB
Rust
use std::convert::TryInto;
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use std::fs::create_dir_all;
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use crate::typecheck::context::InferenceContext;
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use crate::typecheck::inference_core;
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use crate::typecheck::magic_methods;
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use crate::typecheck::typedef::{Type, TypeEnum};
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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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use super::inference_core::resolve_call;
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pub struct ExpressionTypeInferencer<'a> {
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pub ctx: InferenceContext<'a>
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}
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impl<'a> ExpressionTypeInferencer<'a> { // NOTE: add location here in the function parameter for better error message?
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fn infer_constant_val(&self, constant: &ast::Constant) -> Result<Option<Type>, String> {
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match constant {
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ast::Constant::Bool(_) =>
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Ok(Some(self.ctx.get_primitive(primitives::BOOL_TYPE))),
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ast::Constant::Int(val) => {
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let int32: Result<i32, _> = val.try_into();
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let int64: Result<i64, _> = val.try_into();
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if int32.is_ok() {
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Ok(Some(self.ctx.get_primitive(primitives::INT32_TYPE)))
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} else if int64.is_ok() {
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Ok(Some(self.ctx.get_primitive(primitives::INT64_TYPE)))
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} else {
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Err("Integer out of bound".into())
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}
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},
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ast::Constant::Float(_) =>
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Ok(Some(self.ctx.get_primitive(primitives::FLOAT_TYPE))),
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ast::Constant::Tuple(vals) => {
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let result = vals
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.into_iter()
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.map(|x| self.infer_constant_val(x))
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.collect::<Vec<_>>();
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if result.iter().all(|x| x.is_ok()) {
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Ok(Some(TypeEnum::ParametricType(
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primitives::TUPLE_TYPE,
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result
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.into_iter()
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.map(|x| x.unwrap().unwrap())
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.collect::<Vec<_>>(),
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).into()))
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} else {
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Err("Some elements in tuple cannot be typed".into())
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}
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}
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_ => Err("not supported".into())
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}
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}
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fn infer_list_val(&self, elts: &Vec<ast::Expr<Option<Type>>>) -> Result<Option<Type>, String> {
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if elts.is_empty() {
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Ok(Some(TypeEnum::ParametricType(primitives::LIST_TYPE, vec![TypeEnum::BotType.into()]).into()))
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} else {
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let types = elts
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.iter()
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.map(|x| &x.custom)
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.collect::<Vec<_>>();
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if types.iter().all(|x| x.is_some()) {
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let head = types.iter().next().unwrap(); // here unwrap alone should be fine after the previous check
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if types.iter().all(|x| x.eq(head)) {
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Ok(Some(TypeEnum::ParametricType(primitives::LIST_TYPE, vec![(*head).clone().unwrap()]).into()))
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} else {
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Err("inhomogeneous list is not allowed".into())
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}
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} else {
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Err("list elements must have some type".into())
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}
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}
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}
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fn infer_tuple_val(&self, elts: &Vec<ast::Expr<Option<Type>>>) -> Result<Option<Type>, String> {
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let types = elts
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.iter()
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.map(|x| (x.custom).clone())
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.collect::<Vec<_>>();
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if types.iter().all(|x| x.is_some()) {
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Ok(Some(TypeEnum::ParametricType(
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primitives::TUPLE_TYPE,
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types.into_iter().map(|x| x.unwrap()).collect()).into())) // unwrap alone should be fine after the previous check
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} else {
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Err("tuple elements must have some type".into())
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}
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}
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fn infer_arrtibute(&self, value: &Box<ast::Expr<Option<Type>>>, attr: &str) -> Result<Option<Type>, String> {
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let ty = value.custom.clone().ok_or_else(|| "no value".to_string())?;
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if let TypeEnum::TypeVariable(id) = ty.as_ref() {
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let v = self.ctx.get_variable_def(*id);
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if v.bound.is_empty() {
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return Err("no fields on unbounded type variable".into());
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}
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let ty = v.bound[0].get_base(&self.ctx).and_then(|v| v.fields.get(attr));
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if ty.is_none() {
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return Err("unknown field".into());
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}
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for x in v.bound[1..].iter() {
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let ty1 = x.get_base(&self.ctx).and_then(|v| v.fields.get(attr));
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if ty1 != ty {
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return Err("unknown field (type mismatch between variants)".into());
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}
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}
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return Ok(Some(ty.unwrap().clone()));
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}
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match ty.get_base(&self.ctx) {
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Some(b) => match b.fields.get(attr) {
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Some(t) => Ok(Some(t.clone())),
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None => Err("no such field".into()),
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},
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None => Err("this object has no fields".into()),
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}
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}
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fn infer_bool_ops(&self, values: &Vec<ast::Expr<Option<Type>>>) -> Result<Option<Type>, String> {
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assert_eq!(values.len(), 2);
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let left = values[0].custom.clone().ok_or_else(|| "no value".to_string())?;
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let right = values[1].custom.clone().ok_or_else(|| "no value".to_string())?;
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let b = self.ctx.get_primitive(primitives::BOOL_TYPE);
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if left == b && right == b {
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Ok(Some(b))
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} else {
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Err("bool operands must be bool".to_string())
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}
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}
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fn _infer_bin_ops(&self, _left: &Box<ast::Expr<Option<Type>>>, _op: &ast::Operator, _right: &Box<ast::Expr<Option<Type>>>) -> Result<Option<Type>, String> {
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Err("no need this function".into())
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}
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fn infer_unary_ops(&self, op: &ast::Unaryop, operand: &Box<ast::Expr<Option<Type>>>) -> Result<Option<Type>, String> {
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if let ast::Unaryop::Not = op {
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if (**operand).custom == Some(self.ctx.get_primitive(primitives::BOOL_TYPE)) {
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Ok(Some(self.ctx.get_primitive(primitives::BOOL_TYPE)))
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} else {
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Err("logical not must be applied to bool".into())
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}
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} else {
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inference_core::resolve_call(&self.ctx, (**operand).custom.clone(), magic_methods::unaryop_name(op), &[])
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}
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}
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fn infer_compare(&self, left: &Box<ast::Expr<Option<Type>>>, ops: &Vec<ast::Cmpop>, comparators: &Vec<ast::Expr<Option<Type>>>) -> Result<Option<Type>, String> {
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assert!(comparators.len() > 0);
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if left.custom.is_none() || (!comparators.iter().all(|x| x.custom.is_some())) {
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Err("comparison operands must have type".into())
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} else {
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let bool_type = Some(self.ctx.get_primitive(primitives::BOOL_TYPE));
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let ty_first = resolve_call(
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&self.ctx,
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Some(left.custom.clone().ok_or_else(|| "comparator must be able to be typed".to_string())?.clone()),
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magic_methods::comparison_name(&ops[0]).ok_or_else(|| "unsupported comparison".to_string())?,
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&[comparators[0].custom.clone().ok_or_else(|| "comparator must be able to be typed".to_string())?])?;
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if ty_first != bool_type {
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return Err("comparison result must be boolean".into());
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}
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for ((a, b), op)
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in comparators[..(comparators.len() - 1)]
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.iter()
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.zip(comparators[1..].iter())
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.zip(ops[1..].iter()) {
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let ty = resolve_call(
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&self.ctx,
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Some(a.custom.clone().ok_or_else(|| "comparator must be able to be typed".to_string())?.clone()),
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magic_methods::comparison_name(op).ok_or_else(|| "unsupported comparison".to_string())?,
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&[b.custom.clone().ok_or_else(|| "comparator must be able to be typed".to_string())?.clone()])?;
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if ty != bool_type {
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return Err("comparison result must be boolean".into());
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}
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}
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Ok(bool_type)
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}
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}
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fn infer_call(&self, func: &Box<ast::Expr<Option<Type>>>, args: &Vec<ast::Expr<Option<Type>>>, _keywords: &Vec<ast::Keyword<Option<Type>>>) -> Result<Option<Type>, String> {
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if args.iter().all(|x| x.custom.is_some()) {
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match &func.node {
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ast::ExprKind::Name {id, ctx: _}
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=> resolve_call(
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&self.ctx,
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None,
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id,
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&args.iter().map(|x| x.custom.clone().unwrap()).collect::<Vec<_>>()),
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ast::ExprKind::Attribute {value, attr, ctx: _}
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=> resolve_call(
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&self.ctx,
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Some(value.custom.clone().ok_or_else(|| "no value".to_string())?),
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&attr,
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&args.iter().map(|x| x.custom.clone().unwrap()).collect::<Vec<_>>()),
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_ => Err("not supported".into())
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}
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} else {
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Err("function params must have type".into())
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}
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}
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fn infer_subscript(&self, value: &Box<ast::Expr<Option<Type>>>, slice: &Box<ast::Expr<Option<Type>>>) -> Result<Option<Type>, String> {
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// let tt = value.custom.ok_or_else(|| "no value".to_string())?.as_ref();
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let t = if let TypeEnum::ParametricType(primitives::LIST_TYPE, ls) = value.custom.as_ref().ok_or_else(|| "no value".to_string())?.as_ref() {
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ls[0].clone()
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} else {
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return Err("subscript is not supported for types other than list".into());
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};
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if let ast::ExprKind::Slice {lower, upper, step} = &slice.node {
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let int32_type = self.ctx.get_primitive(primitives::INT32_TYPE);
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let l = lower.as_ref().map_or(
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Ok(&int32_type),
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|x| x.custom.as_ref().ok_or("lower bound cannot be typped".to_string()))?;
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let u = upper.as_ref().map_or(
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Ok(&int32_type),
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|x| x.custom.as_ref().ok_or("upper bound cannot be typped".to_string()))?;
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let s = step.as_ref().map_or(
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Ok(&int32_type),
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|x| x.custom.as_ref().ok_or("step cannot be typped".to_string()))?;
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if l == &int32_type && u == &int32_type && s == &int32_type {
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Ok(value.custom.clone())
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} else {
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Err("slice must be int32 type".into())
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}
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} else if slice.custom == Some(self.ctx.get_primitive(primitives::INT32_TYPE)) {
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Ok(Some(t))
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} else {
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Err("slice or index must be int32 type".into())
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}
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}
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fn infer_if_expr(&self, test: &Box<ast::Expr<Option<Type>>>, body: &Box<ast::Expr<Option<Type>>>, orelse: &Box<ast::Expr<Option<Type>>>) -> Result<Option<Type>, String> {
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if test.custom != Some(self.ctx.get_primitive(primitives::BOOL_TYPE)) {
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Err("test should be bool".into())
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} else {
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if body.custom == orelse.custom {
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Ok(body.custom.clone())
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} else {
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Err("divergent type at if expression".into())
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}
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}
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}
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fn infer_list_comprehesion(&mut self, elt: &Box<ast::Expr<Option<Type>>>, generators: &Vec<ast::Comprehension<Option<Type>>>) -> Result<Option<Type>, String> {
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if generators[0]
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.ifs
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.iter()
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.all(|x| x.custom == Some(self.ctx.get_primitive(primitives::BOOL_TYPE))) {
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Ok(Some(TypeEnum::ParametricType(
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primitives::LIST_TYPE,
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vec![elt.custom.clone().ok_or_else(|| "elements should have value".to_string())?]).into()))
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} else {
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Err("test must be bool".into())
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}
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}
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fn fold_comprehension_first(&mut self, node: ast::Comprehension<Option<Type>>) -> Result<ast::Comprehension<Option<Type>>, String> {
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Ok(ast::Comprehension {
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target: node.target,
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iter: Box::new(self.fold_expr(*node.iter)?),
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ifs: node.ifs,
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is_async: node.is_async
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})
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}
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fn fold_comprehension_second(&mut self, node: ast::Comprehension<Option<Type>>) -> Result<ast::Comprehension<Option<Type>>, String> {
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Ok(ast::Comprehension {
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target: Box::new(self.fold_expr(*node.target)?),
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iter: node.iter,
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ifs: node
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.ifs
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.into_iter()
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.map(|x| self.fold_expr(x))
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.collect::<Result<Vec<_>, _>>()?,
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is_async: node.is_async
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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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match &name.node {
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ast::ExprKind::Name {id, ctx: _} => {
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if id == "_" {
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Ok(())
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} else if self.ctx.defined(id) {
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Err("duplicated naming".into())
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} else {
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self.ctx.assign(id.clone(), ty, name.location)?;
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Ok(())
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}
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}
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ast::ExprKind::Tuple {elts, ctx: _} => {
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if let TypeEnum::ParametricType(primitives::TUPLE_TYPE, ls) = ty.as_ref() {
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if elts.len() == ls.len() {
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for (a, b) in elts.iter().zip(ls.iter()) {
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self.infer_simple_binding(a, b.clone())?;
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}
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Ok(())
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} else {
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Err("different length".into())
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}
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} else {
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Err("not supported".into())
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}
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}
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_ => Err("not supported".into())
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}
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}
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}
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impl<'a> ast::fold::Fold<Option<Type>> for ExpressionTypeInferencer<'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); // NOTE: should pass
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let mut expr = node;
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if let ast::Expr {location, custom, node: ast::ExprKind::ListComp {elt, generators } } = expr {
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// is list comprehension, only fold generators which does not include unknown identifiers introduced by list comprehension
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if generators.len() != 1 {
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return Err("only 1 generator statement is supported".into())
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}
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let generators_first_folded = generators
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.into_iter()
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.map(|x| self.fold_comprehension_first(x)).collect::<Result<Vec<_>, _>>()?;
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let gen = &generators_first_folded[0];
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let iter_type = gen.iter.custom.as_ref().ok_or("no value".to_string())?.as_ref();
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if let TypeEnum::ParametricType(primitives::LIST_TYPE, ls) = iter_type {
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self.ctx.stack.level += 1; // FIXME: how to use with_scope??
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self.infer_simple_binding(&gen.target, ls[0].clone())?;
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expr = ast::Expr {
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location,
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custom,
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node: ast::ExprKind::ListComp {
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elt: Box::new(self.fold_expr(*elt)?),
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generators: generators_first_folded
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.into_iter()
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.map(|x| self.fold_comprehension_second(x))
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.collect::<Result<Vec<_>, _>>()?
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}
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};
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self.ctx.stack.level -= 1;
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while !self.ctx.stack.sym_def.is_empty() {
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let (_, level) = self.ctx.stack.sym_def.last().unwrap();
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if *level > self.ctx.stack.level {
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let (name, _) = self.ctx.stack.sym_def.pop().unwrap();
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let (t, b, l) = self.ctx.sym_table.get_mut(&name).unwrap();
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// set it to be unreadable
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*b = false;
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} else {
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break;
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}
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}
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} else {
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return Err("iteration is supported for list only".into());
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}
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} else {
|
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// if not listcomp which requires special handling, skip current level, make sure child nodes have their type
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expr = ast::fold::fold_expr(self, expr)?;
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}
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|
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match &expr.node {
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ast::ExprKind::Constant {value, kind: _} =>
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Ok(ast::Expr {
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location: expr.location,
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custom: self.infer_constant_val(value)?,
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node: expr.node
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}),
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ast::ExprKind::Name {id, ctx: _} =>
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Ok(ast::Expr {
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location: expr.location,
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custom: Some(self.ctx.resolve(id)?),
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node: expr.node
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}),
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ast::ExprKind::List {elts, ctx: _} => {
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Ok(ast::Expr {
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location: expr.location,
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custom: self.infer_list_val(elts)?,
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node: expr.node
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})
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}
|
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ast::ExprKind::Tuple {elts, ctx: _} =>
|
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Ok(ast::Expr {
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location: expr.location,
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custom: self.infer_tuple_val(elts)?,
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node: expr.node
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}),
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ast::ExprKind::Attribute {value, attr, ctx: _} =>
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Ok(ast::Expr {
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location: expr.location,
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custom: self.infer_arrtibute(value, attr)?,
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node: expr.node
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}),
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ast::ExprKind::BoolOp {op: _, values} =>
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Ok(ast::Expr {
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location: expr.location,
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custom: self.infer_bool_ops(values)?,
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node: expr.node
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}),
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ast::ExprKind::BinOp {left, op, right} =>
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Ok(ast::Expr {
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location: expr.location,
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custom: inference_core::resolve_call(
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&self.ctx,
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Some(left.custom.clone().ok_or_else(|| "no value".to_string())?),
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magic_methods::binop_name(op),
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&[right.custom.clone().ok_or_else(|| "no value".to_string())?])?,
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node: expr.node
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}),
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|
|
ast::ExprKind::UnaryOp {op, operand} =>
|
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Ok(ast::Expr {
|
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location: expr.location,
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custom: self.infer_unary_ops(op, operand)?,
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node: expr.node
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}),
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|
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ast::ExprKind::Compare {left, ops, comparators} =>
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Ok(ast::Expr {
|
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location: expr.location,
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custom: self.infer_compare(left, ops, comparators)?,
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node: expr.node
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}),
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|
|
ast::ExprKind::Call {func, args, keywords} =>
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Ok(ast::Expr {
|
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location: expr.location,
|
|
custom: self.infer_call(func, args, keywords)?,
|
|
node: expr.node
|
|
}),
|
|
|
|
/* // REVIEW: add a new primitive type for slice and do type check of bounds here?
|
|
ast::ExprKind::Slice {lower, upper, step } =>
|
|
Ok(ast::Expr {
|
|
location: expr.location,
|
|
custom: self.infer_slice(lower, upper, step)?,
|
|
node: expr.node
|
|
}), */
|
|
|
|
ast::ExprKind::Subscript {value, slice, ctx: _} =>
|
|
Ok(ast::Expr {
|
|
location: expr.location,
|
|
custom: self.infer_subscript(value, slice)?,
|
|
node: expr.node
|
|
}),
|
|
|
|
ast::ExprKind::IfExp {test, body, orelse} =>
|
|
Ok(ast::Expr {
|
|
location: expr.location,
|
|
custom: self.infer_if_expr(test, body, orelse)?,
|
|
node: expr.node
|
|
}),
|
|
|
|
ast::ExprKind::ListComp {elt, generators} => {
|
|
|
|
Ok(ast::Expr {
|
|
location: expr.location,
|
|
custom: self.infer_list_comprehesion(elt, generators)?,
|
|
node: expr.node
|
|
})
|
|
}
|
|
|
|
_ => { // not supported
|
|
Err("not supported yet".into())
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub mod test {
|
|
|
|
use crate::typecheck::{symbol_resolver::SymbolResolver, typedef::*, symbol_resolver::*, location::*};
|
|
use rustpython_parser::ast::{self, Expr, fold::Fold};
|
|
use super::*;
|
|
|
|
pub fn new_ctx<'a>() -> ExpressionTypeInferencer<'a>{
|
|
struct S;
|
|
|
|
impl SymbolResolver for S {
|
|
fn get_symbol_location(&self, _str: &str) -> Option<Location> {
|
|
None
|
|
}
|
|
|
|
fn get_symbol_type(&self, _str: &str) -> Option<SymbolType> {
|
|
None
|
|
}
|
|
|
|
fn get_symbol_value(&self, _str: &str) -> Option<SymbolValue> {
|
|
None
|
|
}
|
|
}
|
|
|
|
ExpressionTypeInferencer {
|
|
ctx: InferenceContext::new(primitives::basic_ctx(), Box::new(S{}), FileID(3)),
|
|
}
|
|
}
|
|
|
|
|
|
#[test]
|
|
fn test_i64() {
|
|
let mut inferencer = new_ctx();
|
|
|
|
let location = ast::Location::new(0, 0);
|
|
let num: i64 = 99999999999;
|
|
|
|
let ast: Expr<Option<Type>> = Expr {
|
|
location: location,
|
|
custom: None,
|
|
node: ast::ExprKind::Constant {
|
|
value: ast::Constant::Int(num.into()),
|
|
kind: None,
|
|
}
|
|
};
|
|
|
|
let new_ast = inferencer.fold_expr(ast).unwrap();
|
|
|
|
assert_eq!(
|
|
new_ast,
|
|
Expr {
|
|
location: location,
|
|
custom: Some(inferencer.ctx.get_primitive(primitives::INT64_TYPE)),
|
|
node: ast::ExprKind::Constant {
|
|
value: ast::Constant::Int(num.into()),
|
|
kind: None,
|
|
}
|
|
}
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_list() {
|
|
let mut inferencer = new_ctx();
|
|
let location = ast::Location::new(0, 0);
|
|
|
|
let ast: Expr<Option<Type>> = Expr {
|
|
location,
|
|
custom: None,
|
|
node: ast::ExprKind::List {
|
|
ctx: ast::ExprContext::Load,
|
|
elts: vec![
|
|
Expr {
|
|
location,
|
|
custom: None,
|
|
node: ast::ExprKind::Constant {
|
|
value: ast::Constant::Int(1.into()),
|
|
kind: None,
|
|
},
|
|
},
|
|
|
|
Expr {
|
|
location,
|
|
custom: None,
|
|
node: ast::ExprKind::Constant {
|
|
value: ast::Constant::Int(2.into()),
|
|
kind: None,
|
|
},
|
|
},
|
|
],
|
|
}
|
|
};
|
|
|
|
let new_ast = inferencer.fold_expr(ast).unwrap();
|
|
assert_eq!(
|
|
new_ast,
|
|
Expr {
|
|
location,
|
|
custom: Some(TypeEnum::ParametricType(primitives::LIST_TYPE, vec![inferencer.ctx.get_primitive(primitives::INT32_TYPE).into()]).into()),
|
|
node: ast::ExprKind::List {
|
|
ctx: ast::ExprContext::Load,
|
|
elts: vec![
|
|
Expr {
|
|
location,
|
|
custom: Some(inferencer.ctx.get_primitive(primitives::INT32_TYPE)),
|
|
node: ast::ExprKind::Constant {
|
|
value: ast::Constant::Int(1.into()),
|
|
kind: None,
|
|
},
|
|
},
|
|
|
|
Expr {
|
|
location,
|
|
custom: Some(inferencer.ctx.get_primitive(primitives::INT32_TYPE)),
|
|
node: ast::ExprKind::Constant {
|
|
value: ast::Constant::Int(2.into()),
|
|
kind: None,
|
|
},
|
|
},
|
|
],
|
|
}
|
|
}
|
|
);
|
|
}
|
|
|
|
}
|