Beispiel #1
0
// associate installs the new template into the group of templates associated
// with t. It is an error to reuse a name except to overwrite an empty
// template. The two are already known to share the common structure.
// The boolean return value reports wither to store this tree as t.Tree.
func (t *Template) associate(new *Template, tree *parse.Tree) (bool, error) {
	if new.common != t.common {
		panic("internal error: associate not common")
	}
	name := new.name
	if old := t.tmpl[name]; old != nil {
		oldIsEmpty := parse.IsEmptyTree(old.Root)
		newIsEmpty := parse.IsEmptyTree(tree.Root)
		if newIsEmpty {
			// Whether old is empty or not, new is empty; no reason to replace old.
			return false, nil
		}
		if !oldIsEmpty {
			return false, fmt.Errorf("template: redefinition of template %q", name)
		}
	}
	t.tmpl[name] = new
	return true, nil
}
Beispiel #2
0
// associate installs the new template into the group of templates associated
// with t. The two are already known to share the common structure.
// The boolean return value reports whether to store this tree as t.Tree.
func (t *Template) associate(new *Template, tree *parse.Tree) (bool, error) {
	if new.common != t.common {
		panic("internal error: associate not common")
	}
	if t.tmpl[new.name] != nil && parse.IsEmptyTree(tree.Root) {
		// If a template by that name exists,
		// don't replace it with an empty template.
		return false, nil
	}
	t.tmpl[new.name] = new
	return true, nil
}