[英]Go: How to use the func() bool arguments in go?
This is a sample code from the Go blackfriday package: 这是Go blackfriday包中的示例代码:
package main
import (
"bytes"
"fmt"
"github.com/russross/blackfriday"
)
func main() {
input := []byte(`##Title
- another paragragh
This is a being rendered in a custom way.
`)
htmlFlags := 0
renderer := &renderer{Html: blackfriday.HtmlRenderer(htmlFlags, "", "").(*blackfriday.Html)}
extensions := 0
unsanitized := blackfriday.Markdown(input, renderer, extensions)
os.Stdout.Write(unsanitized)
}
// renderer implements blackfriday.Renderer and reuses blackfriday.Html for the most part,
// except overriding Link rendering.
type renderer struct {
*blackfriday.Html
}
func (options *renderer) Header(out *bytes.Buffer, text func() bool, level int, id string) {
fmt.Fprintf(out, "<custom link %q to %q>", content, link)
}
The purpose of the code is to customize the link
attributes of the output HTML. 该代码的目的是自定义输出HTML的
link
属性。
I tried to do the same but with p
tags: 我试图做同样的事情,但带有
p
标签:
func (options *renderer) Paragraph(out *bytes.Buffer, text func() bool) {
fmt.Fprintf(out, "<p class='custom'>%q</p>", text)
}
But the output was this: 但是输出是这样的:
<h1>Title</h1>
<ul>
<li>another paragragh</li>
</ul>
<p class='custom'>%!q(func() bool=0x80a15d0)</p>
So I have no idea how to output the actual text ( This is a being rendered in a custom way.
). 所以我不知道如何输出实际的文本(
This is a being rendered in a custom way.
)。 Any ideas? 有任何想法吗?
This is the source code of the function: 这是该函数的源代码:
func (options *Html) Paragraph(out *bytes.Buffer, text func() bool) {
marker := out.Len()
doubleSpace(out)
out.WriteString("<p>")
if !text() {
out.Truncate(marker)
return
}
out.WriteString("</p>\n")
}
I believe all you need to do is call text
我相信您要做的就是致电
text
func (options *renderer) Paragraph(out *bytes.Buffer, text func() bool) {
fmt.Fprintf(out, "<p class='custom'>%q</p>\n", text())
}
I think your usage of function is wrong. 我认为您使用的功能是错误的。
Take a look at Html.Paragraph
and override this. 看看
Html.Paragraph
并覆盖它。
Maybe it would look like: 也许看起来像:
func (options *renderer) Paragraph(out *bytes.Buffer, text func() bool) {
marker := out.Len()
doubleSpace(out)
out.WriteString("<p class='custom'>")
if !text() {
out.Truncate(marker)
return
}
out.WriteString("</p>\n")
}
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