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delimited_block_source.go
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delimited_block_source.go
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package sgml
import (
"fmt"
"strings"
"github.com/alecthomas/chroma/v2"
"github.com/alecthomas/chroma/v2/formatters/html"
"github.com/alecthomas/chroma/v2/lexers"
"github.com/alecthomas/chroma/v2/styles"
"github.com/bytesparadise/libasciidoc/pkg/types"
"github.com/davecgh/go-spew/spew"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
)
func (r *sgmlRenderer) renderSourceBlock(ctx *context, b *types.DelimitedBlock) (string, error) {
// first, render the content
content, highlighter, language, err := r.renderSourceBlockElements(ctx, b)
if err != nil {
return "", errors.Wrap(err, "unable to render source block content")
}
roles, err := r.renderElementRoles(ctx, b.Attributes)
if err != nil {
return "", errors.Wrap(err, "unable to render source block roles")
}
var nowrap bool
if options, ok := b.Attributes[types.AttrOptions].(types.Options); ok {
for _, opt := range options {
if opt == "nowrap" {
nowrap = true
break
}
}
}
title, err := r.renderElementTitle(ctx, b.Attributes)
if err != nil {
return "", errors.Wrap(err, "unable to render source block title")
}
return r.execute(r.sourceBlock, struct {
ID string
Title string
Roles string
Language string
Nowrap bool
SyntaxHighlighter string
Content string
}{
ID: r.renderElementID(b.Attributes),
Title: title,
SyntaxHighlighter: highlighter,
Roles: roles,
Language: language,
Nowrap: nowrap,
Content: strings.Trim(content, "\n"),
})
}
func (r *sgmlRenderer) renderSourceParagraph(ctx *context, p *types.Paragraph) (string, error) {
attributes := p.Attributes
attributes[types.AttrStyle] = types.Source
return r.renderSourceBlock(ctx, &types.DelimitedBlock{
Attributes: attributes,
Elements: p.Elements,
})
}
func (r *sgmlRenderer) renderSourceBlockElements(ctx *context, b *types.DelimitedBlock) (string, string, string, error) {
previousWithinDelimitedBlock := ctx.withinDelimitedBlock
defer func() {
ctx.withinDelimitedBlock = previousWithinDelimitedBlock
}()
ctx.withinDelimitedBlock = true
highlighter := ctx.attributes.GetAsStringWithDefault(types.AttrSyntaxHighlighter, "")
language := b.Attributes.GetAsStringWithDefault(types.AttrLanguage, "")
// render without syntax highlight
if language == "" || (highlighter != "chroma" && highlighter != "pygments") {
log.Debug("rendering souce block without syntax highlighting")
content, err := r.renderElements(ctx, b.Elements)
return content, highlighter, language, err
}
log.Debug("rendering souce block with syntax highlighting")
// render with syntax highlight
lines := types.SplitElementsPerLine(b.Elements)
if log.IsLevelEnabled(log.DebugLevel) {
log.Debugf("splitted lines:\n%s", spew.Sdump(lines))
}
// using github.com/alecthomas/v2 to highlight the content
lexer := lexers.Get(language)
if lexer == nil {
lexer = lexers.Fallback
}
lexer = chroma.Coalesce(lexer)
style := styles.Fallback
if s, found := ctx.attributes.GetAsString(highlighter + "-style"); found {
style = styles.Get(s)
}
options := []html.Option{
html.ClassPrefix(ctx.attributes.GetAsStringWithDefault(types.AttrChromaClassPrefix, "tok-")),
html.PreventSurroundingPre(true),
}
// extra option: inline CSS instead of classes
if ctx.attributes.GetAsStringWithDefault(highlighter+"-css", "classes") == "style" {
options = append(options, html.WithClasses(false))
} else {
options = append(options, html.WithClasses(true))
}
result := &strings.Builder{}
for i, line := range lines {
// extra option: line numbers
if b.Attributes.Has(types.AttrLineNums) {
options = append(options, html.WithLineNumbers(true), html.BaseLineNumber(i+1))
}
renderedLine, callouts, err := r.renderSourceLine(ctx, line)
if err != nil {
return "", "", "", err
}
highlightedLineBuf := &strings.Builder{}
iterator, err := lexer.Tokenise(nil, renderedLine)
if err != nil {
return "", "", "", err
}
if err = html.New(options...).Format(highlightedLineBuf, style, iterator); err != nil {
return "", "", "", err
}
result.WriteString(highlightedLineBuf.String())
// append callouts at the end of the highlighted line
for _, callout := range callouts {
renderedCallout, err := r.renderCalloutRef(callout)
if err != nil {
return "", "", "", err
}
result.WriteString(renderedCallout)
}
if i < len(lines)-1 {
result.WriteRune('\n')
}
}
if log.IsLevelEnabled(log.DebugLevel) {
log.Debugf("source block content:\n%s", result.String())
}
return result.String(), highlighter, language, nil
}
func (r *sgmlRenderer) renderSourceLine(_ *context, line interface{}) (string, []*types.Callout, error) {
elements, ok := line.([]interface{})
if !ok {
return "", nil, fmt.Errorf("invalid type of line: '%T'", line)
}
result := strings.Builder{}
callouts := make([]*types.Callout, 0, len(elements))
for _, e := range elements {
switch e := e.(type) {
case *types.StringElement, *types.SpecialCharacter:
s, err := RenderPlainText(e, WithoutEscape())
if err != nil {
return "", nil, err
}
result.WriteString(s)
case *types.Callout:
callouts = append(callouts, e)
default:
return "", nil, fmt.Errorf("unexpected type of element: '%T'", line)
}
}
return result.String(), callouts, nil
}
func (r *sgmlRenderer) renderCalloutRef(co *types.Callout) (string, error) {
result := &strings.Builder{}
tmpl, err := r.calloutRef()
if err != nil {
return "", errors.Wrap(err, "unable to load cross references template")
}
if err = tmpl.Execute(result, co); err != nil {
return "", errors.Wrap(err, "unable to render callout reference")
}
return result.String(), nil
}