--- /dev/null
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package present
+
+import (
+ "fmt"
+ "strings"
+)
+
+func init() {
+ Register("video", parseVideo)
+}
+
+type Video struct {
+ Cmd string // original command from present source
+ URL string
+ SourceType string
+ Width int
+ Height int
+}
+
+func (v Video) PresentCmd() string { return v.Cmd }
+func (v Video) TemplateName() string { return "video" }
+
+func parseVideo(ctx *Context, fileName string, lineno int, text string) (Elem, error) {
+ args := strings.Fields(text)
+ if len(args) < 3 {
+ return nil, fmt.Errorf("incorrect video invocation: %q", text)
+ }
+ vid := Video{Cmd: text, URL: args[1], SourceType: args[2]}
+ a, err := parseArgs(fileName, lineno, args[3:])
+ if err != nil {
+ return nil, err
+ }
+ switch len(a) {
+ case 0:
+ // no size parameters
+ case 2:
+ // If a parameter is empty (underscore) or invalid
+ // leave the field set to zero. The "video" action
+ // template will then omit that vid tag attribute and
+ // the browser will calculate the value to preserve
+ // the aspect ratio.
+ if v, ok := a[0].(int); ok {
+ vid.Height = v
+ }
+ if v, ok := a[1].(int); ok {
+ vid.Width = v
+ }
+ default:
+ return nil, fmt.Errorf("incorrect video invocation: %q", text)
+ }
+ return vid, nil
+}