copy top level assignment logic from nac3standalone

src/main.rs

@@ -1,11 +1,11 @@
-use std::collections::HashMap;
+use std::collections::{HashMap, HashSet};
 use std::num::NonZeroUsize;
 use std::path::Path;
 use std::process::Command;
 use std::sync::Arc;
 
-use parking_lot::Mutex;
 use eframe::egui;
+use parking_lot::{Mutex, RwLock};
 
 use nac3core::codegen;
 use nac3core::inkwell;
@@ -17,6 +17,188 @@ use nac3core::typecheck::{type_inferencer, typedef};
 mod basic_symbol_resolver;
 use basic_symbol_resolver::{Resolver, ResolverInternal};
 
+fn handle_typevar_definition(
+    var: &nac3parser::ast::Expr,
+    resolver: &(dyn nac3core::symbol_resolver::SymbolResolver + Send + Sync),
+    def_list: &[Arc<RwLock<toplevel::TopLevelDef>>],
+    unifier: &mut nac3core::typecheck::typedef::Unifier,
+    primitives: &type_inferencer::PrimitiveStore,
+) -> Result<typedef::Type, HashSet<String>> {
+    let nac3parser::ast::ExprKind::Call { func, args, .. } = &var.node else {
+        return Err(HashSet::from([format!(
+            "expression {var:?} cannot be handled as a generic parameter in global scope"
+        )]));
+    };
+
+    match &func.node {
+        nac3parser::ast::ExprKind::Name { id, .. } if id == &"TypeVar".into() => {
+            let nac3parser::ast::ExprKind::Constant {
+                value: nac3parser::ast::Constant::Str(ty_name),
+                ..
+            } = &args[0].node
+            else {
+                return Err(HashSet::from([format!(
+                    "Expected string constant for first parameter of `TypeVar`, got {:?}",
+                    &args[0].node
+                )]));
+            };
+            let generic_name: nac3parser::ast::StrRef = ty_name.to_string().into();
+
+            let constraints = args
+                .iter()
+                .skip(1)
+                .map(|x| -> Result<typedef::Type, HashSet<String>> {
+                    let ty = toplevel::type_annotation::parse_ast_to_type_annotation_kinds(
+                        resolver,
+                        def_list,
+                        unifier,
+                        primitives,
+                        x,
+                        HashMap::new(),
+                    )?;
+                    toplevel::type_annotation::get_type_from_type_annotation_kinds(
+                        def_list, unifier, primitives, &ty, &mut None,
+                    )
+                })
+                .collect::<Result<Vec<_>, _>>()?;
+            let loc = func.location;
+
+            if constraints.len() == 1 {
+                return Err(HashSet::from([format!(
+                    "A single constraint is not allowed (at {loc})"
+                )]));
+            }
+
+            Ok(unifier
+                .get_fresh_var_with_range(&constraints, Some(generic_name), Some(loc))
+                .ty)
+        }
+
+        nac3parser::ast::ExprKind::Name { id, .. } if id == &"ConstGeneric".into() => {
+            if args.len() != 2 {
+                return Err(HashSet::from([format!(
+                    "Expected 2 arguments for `ConstGeneric`, got {}",
+                    args.len()
+                )]));
+            }
+
+            let nac3parser::ast::ExprKind::Constant {
+                value: nac3parser::ast::Constant::Str(ty_name),
+                ..
+            } = &args[0].node
+            else {
+                return Err(HashSet::from([format!(
+                    "Expected string constant for first parameter of `ConstGeneric`, got {:?}",
+                    &args[0].node
+                )]));
+            };
+            let generic_name: nac3parser::ast::StrRef = ty_name.to_string().into();
+
+            let ty = toplevel::type_annotation::parse_ast_to_type_annotation_kinds(
+                resolver,
+                def_list,
+                unifier,
+                primitives,
+                &args[1],
+                HashMap::new(),
+            )?;
+            let constraint = toplevel::type_annotation::get_type_from_type_annotation_kinds(
+                def_list, unifier, primitives, &ty, &mut None,
+            )?;
+            let loc = func.location;
+
+            Ok(unifier
+                .get_fresh_const_generic_var(constraint, Some(generic_name), Some(loc))
+                .ty)
+        }
+
+        _ => Err(HashSet::from([format!(
+            "expression {var:?} cannot be handled as a generic parameter in global scope"
+        )])),
+    }
+}
+
+fn handle_assignment_pattern(
+    targets: &[nac3parser::ast::Expr],
+    value: &nac3parser::ast::Expr,
+    resolver: &(dyn nac3core::symbol_resolver::SymbolResolver + Send + Sync),
+    internal_resolver: &ResolverInternal,
+    def_list: &[Arc<RwLock<toplevel::TopLevelDef>>],
+    unifier: &mut nac3core::typecheck::typedef::Unifier,
+    primitives: &type_inferencer::PrimitiveStore,
+) -> Result<(), String> {
+    if targets.len() == 1 {
+        match &targets[0].node {
+            nac3parser::ast::ExprKind::Name { id, .. } => {
+                if let Ok(var) =
+                    handle_typevar_definition(value, resolver, def_list, unifier, primitives)
+                {
+                    internal_resolver.add_id_type(*id, var);
+                    Ok(())
+                } else if let Ok(val) =
+                    toplevel::helper::parse_parameter_default_value(value, resolver)
+                {
+                    internal_resolver.add_module_global(*id, val);
+                    Ok(())
+                } else {
+                    Err(format!("fails to evaluate this expression `{:?}` as a constant or generic parameter at {}",
+                        targets[0].node,
+                        targets[0].location,
+                    ))
+                }
+            }
+            nac3parser::ast::ExprKind::List { elts, .. }
+            | nac3parser::ast::ExprKind::Tuple { elts, .. } => {
+                handle_assignment_pattern(
+                    elts,
+                    value,
+                    resolver,
+                    internal_resolver,
+                    def_list,
+                    unifier,
+                    primitives,
+                )?;
+                Ok(())
+            }
+            _ => Err(format!(
+                "assignment to {:?} is not supported at {}",
+                targets[0], targets[0].location
+            )),
+        }
+    } else {
+        match &value.node {
+            nac3parser::ast::ExprKind::List { elts, .. }
+            | nac3parser::ast::ExprKind::Tuple { elts, .. } => {
+                if elts.len() == targets.len() {
+                    for (tar, val) in targets.iter().zip(elts) {
+                        handle_assignment_pattern(
+                            std::slice::from_ref(tar),
+                            val,
+                            resolver,
+                            internal_resolver,
+                            def_list,
+                            unifier,
+                            primitives,
+                        )?;
+                    }
+                    Ok(())
+                } else {
+                    Err(format!(
+                        "number of elements to unpack does not match (expect {}, found {}) at {}",
+                        targets.len(),
+                        elts.len(),
+                        value.location
+                    ))
+                }
+            }
+            _ => Err(format!(
+                "unpack of this expression is not supported at {}",
+                value.location
+            )),
+        }
+    }
+}
+
 fn compile(code: &String, run_symbol: &String, output_filename: &Path) -> Result<(), String> {
     let mut target_machine_options = codegen::CodeGenTargetMachineOptions::from_host();
     target_machine_options.reloc_mode = inkwell::targets::RelocMode::PIC;
@@ -59,6 +241,20 @@ fn compile(code: &String, run_symbol: &String, output_filename: &Path) -> Result
             }
         };
     for mut stmt in parser_result {
+        if let nac3parser::ast::StmtKind::Assign { targets, value, .. } = stmt.node {
+            let def_list = composer.extract_def_list();
+            let unifier = &mut composer.unifier;
+            let primitives = &composer.primitives_ty;
+            handle_assignment_pattern(
+                &targets,
+                &value,
+                resolver.as_ref(),
+                internal_resolver.as_ref(),
+                &def_list,
+                unifier,
+                primitives,
+            )?;
+        } else {
             if let nac3parser::ast::StmtKind::FunctionDef { name, .. } = &mut stmt.node {
                 if name.to_string() == "run" {
                     *name = run_symbol.as_str().into();
@@ -76,6 +272,7 @@ fn compile(code: &String, run_symbol: &String, output_filename: &Path) -> Result
                 }
             }
         }
+    }
 
     let signature = typedef::FunSignature {
         args: vec![],