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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| use folidity_diagnostics::Report; | ||
| use folidity_parser::{ | ||
| ast as parsed_ast, | ||
| Span, | ||
| }; | ||
|
|
||
| use crate::{ | ||
| ast::{ | ||
| BinaryExpression, | ||
| Expression, | ||
| TypeVariant, | ||
| }, | ||
| contract::ContractDefinition, | ||
| symtable::Scope, | ||
| types::{ | ||
| report_type_mismatch, | ||
| ExpectedType, | ||
| }, | ||
| }; | ||
|
|
||
| use super::{ | ||
| dynamic_to_concrete_type, | ||
| expression, | ||
| }; | ||
|
|
||
| /// Resolve multiplication. | ||
| pub fn resolve_multiply( | ||
| left: &parsed_ast::Expression, | ||
| right: &parsed_ast::Expression, | ||
| loc: Span, | ||
| scope: &mut Scope, | ||
| contract: &mut ContractDefinition, | ||
| expected_ty: ExpectedType, | ||
| ) -> Result<Expression, ()> { | ||
| let allowed_tys = &[TypeVariant::Int, TypeVariant::Uint, TypeVariant::Float]; | ||
| match &expected_ty { | ||
| ExpectedType::Concrete(ty) => { | ||
| match ty { | ||
| TypeVariant::Int | TypeVariant::Uint | TypeVariant::Float => { | ||
| let resolved_left = expression(left, expected_ty.clone(), scope, contract); | ||
| let resolved_right = expression(right, expected_ty.clone(), scope, contract); | ||
|
|
||
| if resolved_left.is_err() || resolved_right.is_err() { | ||
| return Err(()); | ||
| } | ||
|
|
||
| let right = Box::new(resolved_right.unwrap()); | ||
| let left = Box::new(resolved_left.unwrap()); | ||
|
|
||
| if right.is_literal() && left.is_literal() { | ||
| // todo: resolve it to the number | ||
| } | ||
|
|
||
| Ok(Expression::Multiply(BinaryExpression { | ||
| loc, | ||
| left, | ||
| right, | ||
| ty: ty.clone(), | ||
| })) | ||
| } | ||
| a_ty => { | ||
| let expected: Vec<ExpectedType> = allowed_tys | ||
| .iter() | ||
| .map(|ty| ExpectedType::Concrete(ty.clone())) | ||
| .collect(); | ||
| report_type_mismatch(expected.as_slice(), a_ty, &loc, contract); | ||
| Err(()) | ||
| } | ||
| } | ||
| } | ||
| ExpectedType::Dynamic(tys) => { | ||
| let concrete = deduce_type(left, right, &loc, tys, allowed_tys, scope, contract)?; | ||
| resolve_multiply(left, right, loc, scope, contract, concrete) | ||
| } | ||
| ExpectedType::Empty => { | ||
| contract.diagnostics.push(Report::semantic_error( | ||
| loc.clone(), | ||
| String::from("Multiplication can only be used in expression."), | ||
| )); | ||
| Err(()) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// Find a valid concrete type from the list of allowed types. | ||
| /// - If suggested types are empty, we resolve the type from the left hand expression. | ||
| /// - Otherwise, we check every possible allowed type and filter out the ones to which the | ||
| /// left-hand expression can not be resolved. | ||
| /// or check the right one. | ||
| /// # Errors | ||
| /// - Expression can not be resolved to any of the allowed types. | ||
| fn deduce_type( | ||
| left: &parsed_ast::Expression, | ||
| right: &parsed_ast::Expression, | ||
| loc: &Span, | ||
| tys: &Vec<TypeVariant>, | ||
| allowed_tys: &[TypeVariant], | ||
| scope: &mut Scope, | ||
| contract: &mut ContractDefinition, | ||
| ) -> Result<ExpectedType, ()> { | ||
| if tys.is_empty() { | ||
| let expr = expression(left, ExpectedType::Dynamic(vec![]), scope, contract)?; | ||
| Ok(ExpectedType::Concrete(expr.ty().clone())) | ||
| } else { | ||
| // just clone the scope and contract definition as we need to dry run expression | ||
| // resolution. | ||
| // todo: optimise later | ||
| let mut scope = scope.clone(); | ||
| let mut contract = contract.clone(); | ||
| // we find which types are allowed by checking whether the left hand side expression can | ||
| // be resolved to it. | ||
| let filtered_tys: Vec<TypeVariant> = allowed_tys | ||
| .iter() | ||
| .filter(|&ty| { | ||
| expression( | ||
| left, | ||
| ExpectedType::Concrete(ty.clone()), | ||
| &mut scope, | ||
| &mut contract, | ||
| ) | ||
| .is_ok() | ||
| || expression( | ||
| right, | ||
| ExpectedType::Concrete(ty.clone()), | ||
| &mut scope, | ||
| &mut contract, | ||
| ) | ||
| .is_ok() | ||
| }) | ||
| .cloned() | ||
| .collect(); | ||
|
|
||
| if filtered_tys.is_empty() { | ||
| contract.diagnostics.push(Report::type_error( | ||
| loc.clone(), | ||
| String::from("Cannot resolve these expression to any of the supported types."), | ||
| )); | ||
| return Err(()); | ||
| } | ||
| Ok(dynamic_to_concrete_type(tys, allowed_tys)) | ||
| } | ||
| } |
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