Add some helpers for tree manipulation

src/toml/parser.go

@@ -1,3 +1,29 @@
 // TOML Parser.
 
 package toml
+
+import (
+	"strings"
+)
+
+// Given a tree and a key, create the necessary intermediate subtrees to create
+// a subtree at that point. In-place.
+//
+// e.g. passing a.b.c will create (assuming tree is empty) tree[a], tree[a][b]
+// and tree[a][b][c]
+func createSubTree(tree *tomlTree, key string) {
+	subtree := tree
+	for _, intermediate_key := range strings.Split(key, ".") {
+		_, exists := (*subtree)[intermediate_key]
+		if !exists {
+			(*subtree)[intermediate_key] = make(tomlTree)
+		}
+		subtree = (*subtree)[intermediate_key].(*tomlTree)
+	}
+}
+
+
+func parse(chan token) *tomlTree {
+	result := make(tomlTree)
+	return &result
+}