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
+}

src/toml/parser_test.go

@@ -0,0 +1,13 @@
+package toml
+
+import "testing"
+
+
+func testCreateSubTree(t *testing.T) {
+	tree := make(tomlTree)
+	createSubTree(&tree, "a.b.c")
+	tree.Set("a.b.c", 42)
+	if tree.Get("a.b.c") != 42 {
+		t.Fail()
+	}
+}

src/toml/toml.go

@@ -2,7 +2,47 @@
 
 package toml
 
-func Load() map[string]interface{} {
-	result := make(map[string]interface{})
+import (
+	"strings"
+)
+
+// Definition of a tomlTree
+type tomlTree map[string]interface{}
+
+// Retrieve an element from the tree.
+//
+// If the path described by the key does not exist, nil is returned.
+func (t *tomlTree) Get(key string) interface{} {
+	subtree := t
+	keys := strings.Split(key, ".")
+	for _, intermediate_key := range keys[:len(keys)-1] {
+		_, exists := (*subtree)[intermediate_key]
+		if !exists {
+			return nil
+		}
+		subtree = (*subtree)[intermediate_key].(*tomlTree)
+	}
+	return (*subtree)[keys[len(keys) - 1]]
+}
+
+// Set an element in the tree.
+//
+// Creates all necessary intermediates trees, if needed.
+func (t *tomlTree) Set(key string, value interface{}) {
+	subtree := t
+	keys := strings.Split(key, ".")
+	for _, intermediate_key := range keys[:len(keys)-1] {
+		_, exists := (*subtree)[intermediate_key]
+		if !exists {
+			(*subtree)[intermediate_key] = make(tomlTree)
+		}
+		subtree = (*subtree)[intermediate_key].(*tomlTree)
+	}
+	(*subtree)[keys[len(key) - 1]] = value
+}
+
+
+func Load() tomlTree {
+	result := make(tomlTree)
 	return result
 }