organizing

master
Jordan Orelli 8 years ago
parent 01afbe66a2
commit 6bd601359b

@ -17,12 +17,9 @@ func (e *Entity) Read(br bit.Reader) error {
Debug.Printf("entity %v read", e)
fp := newFieldPath()
for fn := walk(htree, br); fn != nil; fn = walk(htree, br) {
if err := br.Err(); err != nil {
return fmt.Errorf("unable to read entity: reader error: %v", err)
}
fn(fp, br)
if err := fp.read(br, htree); err != nil {
return fmt.Errorf("unable to read entity: %v", err)
}
Debug.Printf("fieldpath %s", fp.pathString())
Debug.Printf("fieldpath %v", fp.path())
return nil
}

@ -1,14 +1,16 @@
package ent
import (
"bytes"
"fmt"
"github.com/jordanorelli/hyperstone/bit"
)
// a fieldpath is a list of integers that is used to walk the type hierarchy to
// identify a given field on a given type.
type fieldPath struct {
// slice of values, to be reused over and over
vals []int
// index of the last valid value. e.g., the head of the stack.
last int
}
@ -38,10 +40,20 @@ func (f *fieldPath) replaceAll(fn func(v int) int) {
}
}
func (f *fieldPath) pathString() string {
var buf bytes.Buffer
for i := 0; i <= f.last; i++ {
fmt.Fprintf(&buf, "/%d", f.vals[i])
// reads the sequence of id values off of the provided bit reader given the
// huffman tree of fieldpath ops rooted at the node n
func (f *fieldPath) read(br bit.Reader, n node) error {
f.last = 0
for fn := walk(n, br); fn != nil; fn = walk(n, br) {
if err := br.Err(); err != nil {
return fmt.Errorf("unable to read fieldpath: reader error: %v", err)
}
fn(f, br)
}
return buf.String()
return nil
}
// the subslice of valid index values that has been read on the fieldpath
func (f *fieldPath) path() []int {
return f.vals[:f.last+1]
}

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