php2go/parseutil/SimpleWalker.go

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2020-04-15 07:05:55 +00:00
package parseutil
import (
"fmt"
"github.com/z7zmey/php-parser/node"
"github.com/z7zmey/php-parser/walker"
)
type simpleWalker struct {
cb func(node.Node) error
lastErr error
}
func (mw *simpleWalker) EnterNode(w walker.Walkable) bool {
n, ok := w.(node.Node)
if !ok {
mw.lastErr = fmt.Errorf("Tried to walk non-node '%t'", w)
return false
}
err := mw.cb(n)
if err != nil {
mw.lastErr = err
return false
}
return true
}
func (mw *simpleWalker) LeaveNode(w walker.Walkable) {}
func (mw *simpleWalker) EnterChildNode(key string, w walker.Walkable) {}
func (mw *simpleWalker) LeaveChildNode(key string, w walker.Walkable) {}
func (mw *simpleWalker) EnterChildList(key string, w walker.Walkable) {}
func (mw *simpleWalker) LeaveChildList(key string, w walker.Walkable) {}
var _ walker.Visitor = &simpleWalker{} // interface assertion
func SimpleWalk(n node.Node, cb func(node.Node) error) error {
mw := simpleWalker{cb: cb}
n.Walk(&mw)
return mw.lastErr
}