Starting Zig code generator with one test

internal/zig/ast.go

@@ -0,0 +1,50 @@
+package zig
+
+// https://github.com/ziglang/zig-spec/blob/master/grammar/grammar.peg
+
+type Root struct {
+	ContainerDocComment string // //! Doc Comment
+	ContainerMembers    []*ContainerMember
+}
+
+type ContainerMember struct {
+	// FIXME
+	Decls []Decl
+}
+
+type Decl interface{}
+
+type FnDecl struct {
+	Name       string
+	Params     []*ParamDecl
+	CallConv   string
+	ReturnType TypeExpr
+	Body       *Block // nil means semicolon
+}
+
+type ParamDecl struct {
+	DocComment string   // ??? It's what it says
+	Name       string   // Can be empty
+	Type       TypeExpr // anytype when empty
+}
+
+type Block struct {
+	Label string
+	Stmts []Stmt
+}
+
+type Stmt interface{}
+
+type ReturnStmt struct{}
+
+type Expr interface{}
+
+// This will need to become a real type expr someday
+type TypeExpr string
+
+func (t TypeExpr) String() string {
+	if string(t) == "" {
+		return "anytype"
+	}
+	return string(t)
+}