diff options
Diffstat (limited to 'crates/rebel-lang/src/typing.rs')
| -rw-r--r-- | crates/rebel-lang/src/typing.rs | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/crates/rebel-lang/src/typing.rs b/crates/rebel-lang/src/typing.rs index 6bb0fb5..70fc759 100644 --- a/crates/rebel-lang/src/typing.rs +++ b/crates/rebel-lang/src/typing.rs @@ -2,7 +2,7 @@ use std::{collections::HashMap, fmt::Display}; use enum_kinds::EnumKind; -use rebel_parse::ast::{self, expr, typ}; +use rebel_parse::ast::{self, expr, pat, typ}; use crate::{func::FuncType, scope::Context}; @@ -125,9 +125,25 @@ impl Type { pub fn ast_stmt_type(ctx: &Context, stmt: &ast::BlockStmt<'_>) -> Result<Type> { match stmt { - ast::BlockStmt::Assign { dest: _, expr } => { + ast::BlockStmt::Let { dest: _, expr } => { // TODO: Assignability, dest type - let dest_type = Type::Free; + let mut dest_type = Type::Free; + if let Some(expr) = expr { + let expr_type = Self::ast_expr_type(ctx, expr)?; + dest_type = dest_type.unify(expr_type, Coerce::Assign)?; + } + Ok(dest_type) + } + ast::BlockStmt::Assign { dest, expr } => { + // TODO: Assignability + let pat::Pat::Path(dest_path) = dest.as_ref(); + + let dest_type = ctx + .vars + .lookup(&dest_path.components) + .map(|var| var.inferred_type.clone()) + .ok_or(TypeError)?; + let expr_type = Self::ast_expr_type(ctx, expr)?; dest_type.unify(expr_type, Coerce::Assign) } |