| // Copyright 2012 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("image", parseImage) |
| } |
| |
| type Image struct { |
| URL string |
| Width int |
| Height int |
| } |
| |
| func (i Image) TemplateName() string { return "image" } |
| |
| func parseImage(ctx *Context, fileName string, lineno int, text string) (Elem, error) { |
| args := strings.Fields(text) |
| img := Image{URL: args[1]} |
| a, err := parseArgs(fileName, lineno, args[2:]) |
| if err != nil { |
| return nil, err |
| } |
| switch len(a) { |
| case 0: |
| // no size parameters |
| case 2: |
| if v, ok := a[0].(int); ok { |
| img.Height = v |
| } |
| if v, ok := a[1].(int); ok { |
| img.Width = v |
| } |
| default: |
| return nil, fmt.Errorf("incorrect image invocation: %q", text) |
| } |
| return img, nil |
| } |