api.spaceplanner.app

Spaceplanner API
git clone git://jacobedwards.org/api.spaceplanner.app
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patch.go (1172B)

      1 package main
      2 
      3 import (
      4 	"errors"
      5 	"jacobedwards.org/spaceplanner.app/internal/backend"
      6 )
      7 
      8 func applyPatchset(data map[string]interface{}, patches []backend.Patch) error {
      9 	for _, patch := range patches {
     10 		if err := applyPatch(data, patch); err != nil {
     11 			return err
     12 		}
     13 	}
     14 	return nil
     15 }
     16 
     17 func applyPatch(data map[string]interface{}, p backend.Patch) error {
     18 	// I'm aware path's are suppost to be able to be of any depth. Later.
     19 	v, exists := data[p.Path]
     20 	switch p.Op {
     21 	case "test":
     22 		if v != p.Value {
     23 			return errors.New("test failed")
     24 		}
     25 	case "remove":
     26 		if !exists {
     27 			return errors.New("Cannot remove non-existent")
     28 		}
     29 		delete(data, p.Path)
     30 	case "add":
     31 		data[p.Path] = p.Value
     32 	case "replace":
     33 		if !exists {
     34 			return errors.New("Cannot replace non-existent")
     35 		}
     36 		data[p.Path] = p.Value
     37 	case "move":
     38 		_, fexists := data[p.From]
     39 		if !fexists {
     40 			return errors.New("From does not exist")
     41 		}
     42 		data[p.Path] = data[p.From]
     43 		delete(data, p.From)
     44 	case "copy":
     45 		fv, fexists := data[p.From]
     46 		if !fexists {
     47 			return errors.New("From does not exist")
     48 		}
     49 		data[p.Path] = fv
     50 	default:
     51 		return errors.New(p.Op + ": Invalid operation")
     52 	}
     53 	return nil
     54 }