move package

Author: 川石

compiler/visitor.go renamed to compiler.go

@@ -1,4 +1,4 @@
-package compiler
+package expr
 
 import (
 "fmt"
@@ -25,6 +25,14 @@ func Compile(expr string) (Expression, error) {
 return p.Parse().Accept(visitor).(Expression), nil
 }
 
+func MustCompile(expr string) Expression {
+exp, err := Compile(expr)
+if err != nil {
+return nil
+}
+return exp
+}
+
 type Expression interface {
 Eval(vg ValueGetter) (interface{}, error)
 String() string

compiler/visitor_test.go renamed to compiler_test.go

@@ -1,4 +1,4 @@
-package compiler
+package expr
 
 import (
 "fmt"