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improvement: use lang-* classes declared in snippet markup (#97)

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* improvement: use lang-* classes declared in snippet markup

* fix: don't require snippet lang classes in code blocks

* fix: constrain greedy code block match
This commit is contained in:
Solomon 2024-03-28 23:59:28 +00:00 committed by GitHub
parent bf5300706e
commit 23b8ed8899
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GPG Key ID: B5690EEEBB952194
1 changed files with 9 additions and 6 deletions
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15
src/utils/syntax.go
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@ -14,13 +14,15 @@ import (
// highlightSyntaxViaContent uses Chroma to lex code content and apply the appropriate tokenizer engine.
// If it can't find one, it defaults to JavaScript syntax highlighting.
func highlightSyntaxViaContent(content string) (htmlOut string) {
func highlightSyntaxViaContent(content string, lang string) (htmlOut string) {
content = html.UnescapeString(content)
fallbackOut := html.EscapeString(content)
// identify the language
lexer := lexers.Analyse(content)
lexer := lexers.Get(lang)
if lexer == nil {
lexer = lexers.Analyse(content)
}
if lexer == nil {
lexer = lexers.Get(".js")
}
@ -71,19 +73,20 @@ func stripBlockTags(content string) (result string) {
return
}
var codeBlockRegex = regexp.MustCompile(`(?s)<pre><code>(.*?)<\/code><\/pre>`)
var codeBlockRegex = regexp.MustCompile(`(?s)<pre(?:[^>]+?lang-(.+?)[\s"'])?.*?><code>(.*?)<\/code><\/pre>`)
// HighlightCodeBlocks uses both highlightSyntaxViaContent stripCodeBlocks and returns the newly highlighted code HTML.
func HighlightCodeBlocks(html string) string {
// Replace each code block with the highlighted version
highlightedHTML := codeBlockRegex.ReplaceAllStringFunc(html, func(codeBlock string) string {
// Extract the code content from the code block
codeContent := codeBlockRegex.FindStringSubmatch(codeBlock)[1]
matches := codeBlockRegex.FindStringSubmatch(codeBlock)
lang, codeContent := matches[1], matches[2]
codeContent = stripBlockTags(codeContent)
// Highlight the code content
highlightedCode := highlightSyntaxViaContent(codeContent)
highlightedCode := highlightSyntaxViaContent(codeContent, lang)
// Replace the original code block with the highlighted version
highlightedCodeBlock := "<pre>" + highlightedCode + "</pre>"