initial

1 files changed, 29 insertions, 0 deletions

diff --git a/options.go b/options.go
new file mode 100644
index 0000000..591f552
--- /dev/null
+++ b/options.go
@@ -0,0 +1,29 @@
+package lexpr
+
+type Opt func(*Lexpr)
+
+func WithOperators(operators map[string]Operator) Opt {
+	return func(l *Lexpr) {
+		l.operators = operators
+	}
+}
+
+func WithFunctions(functions map[string]func(ts *TokenStack) error) Opt {
+	return func(l *Lexpr) {
+		l.functions = functions
+	}
+}
+
+func WithValues(variables map[string]any) Opt {
+	return func(l *Lexpr) {
+		l.variables = variables
+	}
+}
+
+func WithDefaults() Opt {
+	return func(l *Lexpr) {
+		l.operators = Operators
+		l.functions = Functions
+		l.variables = map[string]any{}
+	}
+}