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package mxj
// leafnode.go - return leaf nodes with paths and values for the Map
// inspired by: https://groups.google.com/forum/#!topic/golang-nuts/3JhuVKRuBbw
import (
"strconv"
"strings"
)
const (
NoAttributes = true // suppress LeafNode values that are attributes
)
// LeafNode - a terminal path value in a Map.
// For XML Map values it represents an attribute or simple element value - of type
// string unless Map was created using Cast flag. For JSON Map values it represents
// a string, numeric, boolean, or null value.
type LeafNode struct {
Path string // a dot-notation representation of the path with array subscripting
Value interface{} // the value at the path termination
}
// LeafNodes - returns an array of all LeafNode values for the Map.
// The option no_attr argument suppresses attribute values (keys with prepended hyphen, '-')
// as well as the "#text" key for the associated simple element value.
//
// PrependAttrWithHypen(false) will result in attributes having .attr-name as
// terminal node in 'path' while the path for the element value, itself, will be
// the base path w/o "#text".
//
// LeafUseDotNotation(true) causes list members to be identified using ".N" syntax
// rather than "[N]" syntax.
func (mv Map) LeafNodes(no_attr ...bool) []LeafNode {
var a bool
if len(no_attr) == 1 {
a = no_attr[0]
}
l := make([]LeafNode, 0)
getLeafNodes("", "", map[string]interface{}(mv), &l, a)
return l
}
func getLeafNodes(path, node string, mv interface{}, l *[]LeafNode, noattr bool) {
// if stripping attributes, then also strip "#text" key
if !noattr || node != textK {
if path != "" && node[:1] != "[" {
path += "."
}
path += node
}
switch mv.(type) {
case map[string]interface{}:
for k, v := range mv.(map[string]interface{}) {
// if noattr && k[:1] == "-" {
if noattr && len(attrPrefix) > 0 && strings.Index(k, attrPrefix) == 0 {
continue
}
getLeafNodes(path, k, v, l, noattr)
}
case []interface{}:
for i, v := range mv.([]interface{}) {
if useDotNotation {
getLeafNodes(path, strconv.Itoa(i), v, l, noattr)
} else {
getLeafNodes(path, "["+strconv.Itoa(i)+"]", v, l, noattr)
}
}
default:
// can't walk any further, so create leaf
n := LeafNode{path, mv}
*l = append(*l, n)
}
}
// LeafPaths - all paths that terminate in LeafNode values.
func (mv Map) LeafPaths(no_attr ...bool) []string {
ln := mv.LeafNodes()
ss := make([]string, len(ln))
for i := 0; i < len(ln); i++ {
ss[i] = ln[i].Path
}
return ss
}
// LeafValues - all terminal values in the Map.
func (mv Map) LeafValues(no_attr ...bool) []interface{} {
ln := mv.LeafNodes()
vv := make([]interface{}, len(ln))
for i := 0; i < len(ln); i++ {
vv[i] = ln[i].Value
}
return vv
}
// ====================== utilities ======================
// https://groups.google.com/forum/#!topic/golang-nuts/pj0C5IrZk4I
var useDotNotation bool
// LeafUseDotNotation sets a flag that list members in LeafNode paths
// should be identified using ".N" syntax rather than the default "[N]"
// syntax. Calling LeafUseDotNotation with no arguments toggles the
// flag on/off; otherwise, the argument sets the flag value 'true'/'false'.
func LeafUseDotNotation(b ...bool) {
if len(b) == 0 {
useDotNotation = !useDotNotation
return
}
useDotNotation = b[0]
}
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