Correctly set the Meta.Keys() order for inline tables

The table name would be listed *after* the key name; e.g. ./cmd/tomlv
would print:

	    toml-schema.version                              Integer
	toml-schema                                          Hash

For the document:

	toml-schema = {version = 1}

With this it prints the expected:

	toml-schema                                          Hash
	    toml-schema.version                              Integer

Author: arp242

Diff for: decode.go

@@ -248,7 +248,7 @@ func (md *MetaData) unify(data interface{}, rv reflect.Value) error {
 	case reflect.Bool:
 		return md.unifyBool(data, rv)
 	case reflect.Interface:
-		if rv.NumMethod() > 0 { // Only support empty interfaces are supported.
+		if rv.NumMethod() > 0 { /// Only empty interfaces are supported.
 			return md.e("unsupported type %s", rv.Type())
 		}
 		return md.unifyAnything(data, rv)

Diff for: decode_test.go

@@ -1171,6 +1171,36 @@ func TestDecodeDoubleTags(t *testing.T) {
 	}
 }
 
+func TestMetaKeys(t *testing.T) {
+	tests := []struct {
+		in   string
+		want []Key
+	}{
+		{"", []Key{}},
+		{"b=1\na=1", []Key{Key{"b"}, Key{"a"}}},
+		{"a.b=1\na.a=1", []Key{Key{"a", "b"}, Key{"a", "a"}}}, // TODO: should include "a"
+		{"[tbl]\na=1", []Key{Key{"tbl"}, Key{"tbl", "a"}}},
+		{"[tbl]\na.a=1", []Key{Key{"tbl"}, Key{"tbl", "a", "a"}}}, // TODO: should include "a.a"
+		{"tbl={a=1}", []Key{Key{"tbl"}, Key{"tbl", "a"}}},
+		{"tbl={a={b=1}}", []Key{Key{"tbl"}, Key{"tbl", "a"}, Key{"tbl", "a", "b"}}},
+	}
+
+	for _, tt := range tests {
+		t.Run("", func(t *testing.T) {
+			var x interface{}
+			meta, err := Decode(tt.in, &x)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			have := meta.Keys()
+			if !reflect.DeepEqual(tt.want, have) {
+				t.Errorf("\nhave: %s\nwant: %s\n", have, tt.want)
+			}
+		})
+	}
+}
+
 // errorContains checks if the error message in have contains the text in
 // want.
 //

Diff for: encode.go

@@ -503,7 +503,7 @@ func (enc *Encoder) eStruct(key Key, rv reflect.Value, inline bool) {
 
 			fieldVal = eindirect(fieldVal)
 
-			if isNil(fieldVal) { // Don't write anything for nil fields.
+			if isNil(fieldVal) { /// Don't write anything for nil fields.
 				continue
 			}
 

Diff for: parse.go

@@ -203,12 +203,12 @@ func (p *parser) topLevel(item item) {
 		for i := range context {
 			p.addImplicitContext(append(p.context, context[i:i+1]...))
 		}
+		p.ordered = append(p.ordered, p.context.add(p.currentKey))
 
 		/// Set value.
 		vItem := p.next()
 		val, typ := p.value(vItem, false)
 		p.set(p.currentKey, val, typ, vItem.pos)
-		p.ordered = append(p.ordered, p.context.add(p.currentKey))
 
 		/// Remove the context we added (preserving any context from [tbl] lines).
 		p.context = outerContext
@@ -445,11 +445,11 @@ func (p *parser) valueInlineTable(it item, parentIsArray bool) (interface{}, tom
 		for i := range context {
 			p.addImplicitContext(append(p.context, context[i:i+1]...))
 		}
+		p.ordered = append(p.ordered, p.context.add(p.currentKey))
 
 		/// Set the value.
 		val, typ := p.value(p.next(), false)
 		p.set(p.currentKey, val, typ, it.pos)
-		p.ordered = append(p.ordered, p.context.add(p.currentKey))
 		hash[p.currentKey] = val
 
 		/// Restore context.
@@ -570,7 +570,6 @@ func (p *parser) addContext(key Key, array bool) {
 func (p *parser) set(key string, val interface{}, typ tomlType, pos Position) {
 	p.setValue(key, val)
 	p.setType(key, typ, pos)
-
 }
 
 // setValue sets the given key to the given value in the current context.
@@ -651,14 +650,11 @@ func (p *parser) setType(key string, typ tomlType, pos Position) {
 
 // Implicit keys need to be created when tables are implied in "a.b.c.d = 1" and
 // "[a.b.c]" (the "a", "b", and "c" hashes are never created explicitly).
-func (p *parser) addImplicit(key Key)     { p.implicits[key.String()] = struct{}{} }
-func (p *parser) removeImplicit(key Key)  { delete(p.implicits, key.String()) }
-func (p *parser) isImplicit(key Key) bool { _, ok := p.implicits[key.String()]; return ok }
-func (p *parser) isArray(key Key) bool    { return p.keyInfo[key.String()].tomlType == tomlArray }
-func (p *parser) addImplicitContext(key Key) {
-	p.addImplicit(key)
-	p.addContext(key, false)
-}
+func (p *parser) addImplicit(key Key)        { p.implicits[key.String()] = struct{}{} }
+func (p *parser) removeImplicit(key Key)     { delete(p.implicits, key.String()) }
+func (p *parser) isImplicit(key Key) bool    { _, ok := p.implicits[key.String()]; return ok }
+func (p *parser) isArray(key Key) bool       { return p.keyInfo[key.String()].tomlType == tomlArray }
+func (p *parser) addImplicitContext(key Key) { p.addImplicit(key); p.addContext(key, false) }
 
 // current returns the full key name of the current context.
 func (p *parser) current() string {