Extract scopes and scope chain from compiler

1 files changed, 50 insertions, 0 deletions

diff --git a/pkg/lang/compiler/scope/scopes.go b/pkg/lang/compiler/scope/scopes.go
new file mode 100644
index 0000000..39e48ef
--- /dev/null
+++ b/pkg/lang/compiler/scope/scopes.go
@@ -0,0 +1,50 @@
+package scope
+
+import "jinx/pkg/lang/vm/code"
+
+type ScopeID int
+
+type ScopeKind int
+
+const (
+	ScopeKindNormal ScopeKind = iota
+	ScopeKindFunction
+)
+
+type SymbolScope struct {
+	variableSymbols []Symbol[SymbolVariable]
+	functionSymbols []Symbol[SymbolFunction]
+}
+
+func NewSymbolScope() SymbolScope {
+	return SymbolScope{
+		variableSymbols: make([]Symbol[SymbolVariable], 0),
+		functionSymbols: make([]Symbol[SymbolFunction], 0),
+	}
+}
+
+type FunctionScope struct {
+	id           ScopeID
+	unit         code.Marker
+	subUnitCount int
+}
+
+func NewFunctionScope(id ScopeID, unit code.Marker) FunctionScope {
+	return FunctionScope{
+		id:           id,
+		unit:         unit,
+		subUnitCount: 0,
+	}
+}
+
+func (sf FunctionScope) ID() ScopeID {
+	return sf.id
+}
+
+func (sf FunctionScope) Unit() code.Marker {
+	return sf.unit
+}
+
+func (sf FunctionScope) IsRootScope() bool {
+	return sf.ID() == ScopeID(0)
+}