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kramdown: Optionally fall back to rouge #276

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kramdown: Optionally fall back to rouge #276

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32 changes: 24 additions & 8 deletions lib/kramdown/converter/syntax_highlighter/tree_sitter.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@

require 'kramdown'
require 'tree_sitter_adapter'
require 'rouge'

require_relative '../../syntax_tree_sitter/languages'

Expand All @@ -18,15 +19,26 @@ module TreeSitter
def self.call(converter, raw_text, language_alias, type, _)
return nil unless language_alias

language_scope = LANGUAGE_SCOPES.fetch(language_alias, language_alias)
rendered_text = TreeSitterAdapter.highlight(
raw_text,
get_parsers_dir(converter),
language_scope,
get_use_css_classes(converter)
)
begin
language_scope = LANGUAGE_SCOPES.fetch(language_alias, language_alias)
rendered_text = TreeSitterAdapter.highlight(
raw_text,
get_parsers_dir(converter),
language_scope,
get_use_css_classes(converter)
)
rescue => e
if get_fallback_to_rouge(converter)
STDERR.puts "Falling back to rouge for syntax highlighting: #{e}"
rendered_text = Rouge.highlight(raw_text, language_alias, 'html')
attributes="class=\"highlight\""
else
raise
end
end

# Code blocks are additionally wrapped in HTML code tags
type == :block ? "<pre><code>#{rendered_text}</code></pre>" : rendered_text
type == :block ? "<pre><code #{attributes}>#{rendered_text}</code></pre>" : rendered_text
end

def self.get_parsers_dir(converter)
Expand All @@ -39,6 +51,10 @@ def self.get_use_css_classes(converter)
get_option(converter, :css_classes) || false
end

def self.get_fallback_to_rouge(converter)
get_option(converter, :fallback_to_rouge) || false
end

def self.get_option(converter, name)
converter.options[:syntax_highlighter_opts][name]
end
Expand Down