91 lines
2.2 KiB
Go
91 lines
2.2 KiB
Go
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package rendering
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import (
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"bytes"
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"fmt"
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"html/template"
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"regexp"
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"github.com/gomarkdown/markdown/parser"
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"github.com/baez90/goveal/config"
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)
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const (
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parserExtensions = parser.NoIntraEmphasis | parser.Tables | parser.FencedCode |
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parser.Autolink | parser.Strikethrough | parser.SpaceHeadings | parser.HeadingIDs |
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parser.BackslashLineBreak | parser.DefinitionLists | parser.MathJax | parser.Titleblock |
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parser.OrderedListStart | parser.Attributes
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)
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func ToHTML(markdown string, renderCfg config.Rendering) (rendered []byte, err error) {
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var slides []rawSlide
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if slides, err = splitIntoRawSlides(markdown, renderCfg); err != nil {
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return nil, err
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}
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buf := templateRenderBufferPool.Get().(*bytes.Buffer)
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defer func() {
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buf.Reset()
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templateRenderBufferPool.Put(buf)
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}()
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for idx := range slides {
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if rendered, err := slides[idx].ToHTML(); err != nil {
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return nil, err
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} else {
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buf.WriteString(string(rendered))
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}
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}
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return buf.Bytes(), nil
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}
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type rawSlide struct {
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Content string
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Children []rawSlide
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}
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func (s rawSlide) HasNotes() bool {
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return notesLineRegexp.MatchString(s.Content)
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}
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func (s rawSlide) ToHTML() (template.HTML, error) {
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if rendered, err := renderTemplate("slide.gohtml", s); err != nil {
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return "", err
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} else {
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//nolint:gosec // should not be sanitized
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return template.HTML(rendered), nil
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}
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}
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func splitIntoRawSlides(markdown string, renderCfg config.Rendering) ([]rawSlide, error) {
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var (
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verticalSplit, horizontalSplit *regexp.Regexp
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err error
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)
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if verticalSplit, err = regexp.Compile(fmt.Sprintf(splitFormat, renderCfg.VerticalSeparator)); err != nil {
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return nil, err
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}
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if horizontalSplit, err = regexp.Compile(fmt.Sprintf(splitFormat, renderCfg.HorizontalSeparator)); err != nil {
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return nil, err
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}
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horizontalSlides := horizontalSplit.Split(markdown, -1)
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slides := make([]rawSlide, 0, len(horizontalSlides))
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for _, hs := range horizontalSlides {
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s := rawSlide{
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Content: hs,
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}
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verticalSlides := verticalSplit.Split(hs, -1)
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s.Children = make([]rawSlide, 0, len(verticalSlides))
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for _, vs := range verticalSlides {
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s.Children = append(s.Children, rawSlide{Content: vs})
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}
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slides = append(slides, s)
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}
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return slides, nil
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}
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