55 lines
941 B
Go
55 lines
941 B
Go
package cmdlang
|
|
|
|
import (
|
|
"errors"
|
|
)
|
|
|
|
type evalCtx struct {
|
|
parent *evalCtx
|
|
commands map[string]invokable
|
|
vars map[string]object
|
|
}
|
|
|
|
func (ec *evalCtx) addCmd(name string, inv invokable) {
|
|
if ec.commands == nil {
|
|
ec.commands = make(map[string]invokable)
|
|
}
|
|
|
|
ec.commands[name] = inv
|
|
}
|
|
|
|
func (ec *evalCtx) setVar(name string, val object) {
|
|
if ec.vars == nil {
|
|
ec.vars = make(map[string]object)
|
|
}
|
|
ec.vars[name] = val
|
|
}
|
|
|
|
func (ec *evalCtx) getVar(name string) (object, bool) {
|
|
if ec.vars == nil {
|
|
return nil, false
|
|
}
|
|
|
|
if v, ok := ec.vars[name]; ok {
|
|
return v, true
|
|
} else if ec.parent != nil {
|
|
return ec.parent.getVar(name)
|
|
}
|
|
|
|
return nil, false
|
|
}
|
|
|
|
func (ec *evalCtx) lookupCmd(name string) (invokable, error) {
|
|
for e := ec; e != nil; e = e.parent {
|
|
if e.commands == nil {
|
|
continue
|
|
}
|
|
|
|
if cmd, ok := e.commands[name]; ok {
|
|
return cmd, nil
|
|
}
|
|
|
|
}
|
|
return nil, errors.New("name " + name + " not found")
|
|
}
|