示例#1
0
// Parse parses a string into a template. Nested template definitions will be
// associated with the top-level template t. Parse may be called multiple times
// to parse definitions of templates to associate with t. It is an error if a
// resulting template is non-empty (contains content other than template
// definitions) and would replace a non-empty template with the same name.
// (In multiple calls to Parse with the same receiver template, only one call
// can contain text other than space, comments, and template definitions.)
func (t *Template) Parse(text string) (*Template, error) {
	t.init()
	trees, err := parse.Parse(t.name, text, t.leftDelim, t.rightDelim, t.parseFuncs, builtins)
	if err != nil {
		return nil, err
	}
	// Add the newly parsed trees, including the one for t, into our common structure.
	for name, tree := range trees {
		// If the name we parsed is the name of this template, overwrite this template.
		// The associate method checks it's not a redefinition.
		tmpl := t
		if name != t.name {
			tmpl = t.New(name)
		}
		// Even if t == tmpl, we need to install it in the common.tmpl map.
		if replace, err := t.associate(tmpl, tree); err != nil {
			return nil, err
		} else if replace {
			tmpl.Tree = tree
		}
		tmpl.leftDelim = t.leftDelim
		tmpl.rightDelim = t.rightDelim
	}
	return t, nil
}
示例#2
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func TestAddParseTree(t *testing.T) {
	// Create some templates.
	root, err := New("root").Parse(cloneText1)
	if err != nil {
		t.Fatal(err)
	}
	_, err = root.Parse(cloneText2)
	if err != nil {
		t.Fatal(err)
	}
	// Add a new parse tree.
	tree, err := parse.Parse("cloneText3", cloneText3, "", "", nil, builtins)
	if err != nil {
		t.Fatal(err)
	}
	added, err := root.AddParseTree("c", tree["c"])
	// Execute.
	var b bytes.Buffer
	err = added.ExecuteTemplate(&b, "a", 0)
	if err != nil {
		t.Fatal(err)
	}
	if b.String() != "broot" {
		t.Errorf("expected %q got %q", "broot", b.String())
	}
}
示例#3
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// Issue 7032
func TestAddParseTreeToUnparsedTemplate(t *testing.T) {
	master := "{{define \"master\"}}{{end}}"
	tmpl := New("master")
	tree, err := parse.Parse("master", master, "", "", nil)
	if err != nil {
		t.Fatalf("unexpected parse err: %v", err)
	}
	masterTree := tree["master"]
	tmpl.AddParseTree("master", masterTree) // used to panic
}