Add command accessor

parser/accessors.go

@@ -191,6 +191,12 @@ func (section DataSection) External () (external bool) {
 	return
 }
 
+// Command returns the phrase's command.
+func (phrase Phrase) Command () (command Argument) {
+	command = phrase.command
+	return
+}
+
 // Kind returns what kind of phrase it is.
 func (phrase Phrase) Kind () (kind PhraseKind) {
 	kind = phrase.kind

parser/tree.go

@@ -283,8 +283,6 @@ type Phrase struct {
 	
 	kind PhraseKind
 
-	// TODO: do not have this be an argument. make a string version, and
-	// and identifier version.
 	command Argument
 
 	// only applicable for PhraseKindOperator