73 lines
2.1 KiB
Go
73 lines
2.1 KiB
Go
package extension
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import (
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"github.com/yuin/goldmark"
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"github.com/yuin/goldmark/parser"
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"github.com/yuin/goldmark/renderer/html"
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)
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// A CJKOption sets options for CJK support mostly for HTML based renderers.
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type CJKOption func(*cjk)
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// A EastAsianLineBreaks is a style of east asian line breaks.
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type EastAsianLineBreaks int
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const (
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//EastAsianLineBreaksNone renders line breaks as it is.
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EastAsianLineBreaksNone EastAsianLineBreaks = iota
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// EastAsianLineBreaksSimple is a style where soft line breaks are ignored
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// if both sides of the break are east asian wide characters.
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EastAsianLineBreaksSimple
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// EastAsianLineBreaksCSS3Draft is a style where soft line breaks are ignored
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// even if only one side of the break is an east asian wide character.
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EastAsianLineBreaksCSS3Draft
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)
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// WithEastAsianLineBreaks is a functional option that indicates whether softline breaks
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// between east asian wide characters should be ignored.
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// style defauts to [EastAsianLineBreaksSimple] .
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func WithEastAsianLineBreaks(style ...EastAsianLineBreaks) CJKOption {
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return func(c *cjk) {
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if len(style) == 0 {
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c.EastAsianLineBreaks = EastAsianLineBreaksSimple
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return
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}
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c.EastAsianLineBreaks = style[0]
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}
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}
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// WithEscapedSpace is a functional option that indicates that a '\' escaped half-space(0x20) should not be rendered.
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func WithEscapedSpace() CJKOption {
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return func(c *cjk) {
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c.EscapedSpace = true
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}
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}
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type cjk struct {
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EastAsianLineBreaks EastAsianLineBreaks
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EscapedSpace bool
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}
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// CJK is a goldmark extension that provides functionalities for CJK languages.
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var CJK = NewCJK(WithEastAsianLineBreaks(), WithEscapedSpace())
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// NewCJK returns a new extension with given options.
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func NewCJK(opts ...CJKOption) goldmark.Extender {
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e := &cjk{
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EastAsianLineBreaks: EastAsianLineBreaksNone,
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}
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for _, opt := range opts {
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opt(e)
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}
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return e
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}
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func (e *cjk) Extend(m goldmark.Markdown) {
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m.Renderer().AddOptions(html.WithEastAsianLineBreaks(
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html.EastAsianLineBreaks(e.EastAsianLineBreaks)))
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if e.EscapedSpace {
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m.Renderer().AddOptions(html.WithWriter(html.NewWriter(html.WithEscapedSpace())))
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m.Parser().AddOptions(parser.WithEscapedSpace())
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}
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}
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