parser: support selector expression to get / set struct fields

The structures are reresented by reflect values. New instructions
`Field` and `Vassign` have been added to the VM to assign reflect
values and access struct fields.

1 files changed, 7 insertions, 0 deletions

diff --git a/parser/symbol.go b/parser/symbol.go
index f707feb..7edcef3 100644
--- a/parser/symbol.go
+++ b/parser/symbol.go
@@ -30,6 +30,13 @@ type symbol struct {
 	used  bool
 }
 
+func symtype(s *symbol) reflect.Type {
+	if s.Type != nil {
+		return s.Type
+	}
+	return reflect.TypeOf(s.value)
+}
+
 func (p *Parser) AddSym(i int, name string, v any) { p.addSym(i, name, v, symValue, nil, false) }
 
 func (p *Parser) addSym(i int, name string, v any, k symKind, t reflect.Type, local bool) {