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define a context type

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master
Jordan Orelli 10 years ago
parent d4cc9761bd
commit f341593477
1 changed files with 11 additions and 9 deletions
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20
lib/node.go
Unescape Escape View File

@ -26,11 +26,13 @@ const (
var indent = " " var indent = " "
type context map[string]interface{}
type node interface { type node interface {
Type() nodeType Type() nodeType
parse(*parser) error parse(*parser) error
pretty(io.Writer, string) error pretty(io.Writer, string) error
eval(map[string]interface{}) (interface{}, error) eval(context) (interface{}, error)
} }
type rootNode struct { type rootNode struct {
@ -97,7 +99,7 @@ func (n *rootNode) pretty(w io.Writer, prefix string) error {
return nil return nil
} }
func (n *rootNode) eval(ctx map[string]interface{}) (interface{}, error) { func (n *rootNode) eval(ctx context) (interface{}, error) {
for _, child := range n.children { for _, child := range n.children {
if _, err := child.eval(ctx); err != nil { if _, err := child.eval(ctx); err != nil {
return nil, err return nil, err
@ -141,7 +143,7 @@ func (n *commentNode) pretty(w io.Writer, prefix string) error {
return nil return nil
} }
func (n *commentNode) eval(ctx map[string]interface{}) (interface{}, error) { func (n *commentNode) eval(ctx context) (interface{}, error) {
return nil, nil return nil, nil
} }
@ -189,7 +191,7 @@ func (n *assignmentNode) pretty(w io.Writer, prefix string) error {
return nil return nil
} }
func (n *assignmentNode) eval(ctx map[string]interface{}) (interface{}, error) { func (n *assignmentNode) eval(ctx context) (interface{}, error) {
if _, ok := ctx[n.name]; ok { if _, ok := ctx[n.name]; ok {
return nil, fmt.Errorf("invalid re-declaration: %s", n.name) return nil, fmt.Errorf("invalid re-declaration: %s", n.name)
} }
@ -226,7 +228,7 @@ func (s *stringNode) pretty(w io.Writer, prefix string) error {
return err return err
} }
func (s *stringNode) eval(ctx map[string]interface{}) (interface{}, error) { func (s *stringNode) eval(ctx context) (interface{}, error) {
return string(*s), nil return string(*s), nil
} }
@ -290,7 +292,7 @@ func (n *numberNode) pretty(w io.Writer, prefix string) error {
return nil return nil
} }
func (n *numberNode) eval(ctx map[string]interface{}) (interface{}, error) { func (n *numberNode) eval(ctx context) (interface{}, error) {
switch n.t { switch n.t {
case num_int: case num_int:
return n.i, nil return n.i, nil
@ -340,7 +342,7 @@ func (l *listNode) pretty(w io.Writer, prefix string) error {
return nil return nil
} }
func (l *listNode) eval(ctx map[string]interface{}) (interface{}, error) { func (l *listNode) eval(ctx context) (interface{}, error) {
out := make([]interface{}, 0, len(*l)) out := make([]interface{}, 0, len(*l))
for _, n := range *l { for _, n := range *l {
v, err := n.eval(ctx) v, err := n.eval(ctx)
@ -404,7 +406,7 @@ func (o *objectNode) pretty(w io.Writer, prefix string) error {
return nil return nil
} }
func (o *objectNode) eval(ctx map[string]interface{}) (interface{}, error) { func (o *objectNode) eval(ctx context) (interface{}, error) {
out := make(map[string]interface{}, len(*o)) out := make(map[string]interface{}, len(*o))
for name, node := range *o { for name, node := range *o {
v, err := node.eval(ctx) v, err := node.eval(ctx)
@ -439,7 +441,7 @@ func (v *variableNode) pretty(w io.Writer, prefix string) error {
return nil return nil
} }
func (v *variableNode) eval(ctx map[string]interface{}) (interface{}, error) { func (v *variableNode) eval(ctx context) (interface{}, error) {
value, ok := ctx[v.name] value, ok := ctx[v.name]
if !ok { if !ok {
return nil, fmt.Errorf("undefined variable: %s", *v) return nil, fmt.Errorf("undefined variable: %s", *v)

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