gtsocial-umbx

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cjk.go (1299B)

      1 package extension
      2 
      3 import (
      4 	"github.com/yuin/goldmark"
      5 	"github.com/yuin/goldmark/parser"
      6 	"github.com/yuin/goldmark/renderer/html"
      7 )
      8 
      9 // A CJKOption sets options for CJK support mostly for HTML based renderers.
     10 type CJKOption func(*cjk)
     11 
     12 // WithEastAsianLineBreaks is a functional option that indicates whether softline breaks
     13 // between east asian wide characters should be ignored.
     14 func WithEastAsianLineBreaks() CJKOption {
     15 	return func(c *cjk) {
     16 		c.EastAsianLineBreaks = true
     17 	}
     18 }
     19 
     20 // WithEscapedSpace is a functional option that indicates that a '\' escaped half-space(0x20) should not be rendered.
     21 func WithEscapedSpace() CJKOption {
     22 	return func(c *cjk) {
     23 		c.EscapedSpace = true
     24 	}
     25 }
     26 
     27 type cjk struct {
     28 	EastAsianLineBreaks bool
     29 	EscapedSpace        bool
     30 }
     31 
     32 var CJK = NewCJK(WithEastAsianLineBreaks(), WithEscapedSpace())
     33 
     34 // NewCJK returns a new extension with given options.
     35 func NewCJK(opts ...CJKOption) goldmark.Extender {
     36 	e := &cjk{}
     37 	for _, opt := range opts {
     38 		opt(e)
     39 	}
     40 	return e
     41 }
     42 
     43 func (e *cjk) Extend(m goldmark.Markdown) {
     44 	if e.EastAsianLineBreaks {
     45 		m.Renderer().AddOptions(html.WithEastAsianLineBreaks())
     46 	}
     47 	if e.EscapedSpace {
     48 		m.Renderer().AddOptions(html.WithWriter(html.NewWriter(html.WithEscapedSpace())))
     49 		m.Parser().AddOptions(parser.WithEscapedSpace())
     50 	}
     51 }