Commit 6ffafc79 authored by Rémy Coutable's avatar Rémy Coutable

Merge branch 'syntax-highlight-filter-performance' into 'master'

Improve performance of SyntaxHighlightFilter

## What does this MR do?

This MR improves the performance of `Banzai::Filter::SyntaxHighlightFilter`. See e9bacc6575d0002c6cab620075dea3dc7f93f100 for more information.

## Are there points in the code the reviewer needs to double check?

Styling mostly.

## Why was this MR needed?

Syntax highlighting is rather slow.

## What are the relevant issue numbers?

#18592 

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [x] ~~[Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
- [x] ~~API support added~~
- Tests
  - [x] ~~Added for this feature/bug~~
  - [ ] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5643
parents ae83801c 038d6feb
......@@ -22,6 +22,7 @@ v 8.11.0 (unreleased)
- Limit git rev-list output count to one in forced push check
- Clean up unused routes (Josef Strzibny)
- Add green outline to New Branch button. !5447 (winniehell)
- Improve performance of syntax highlighting Markdown code blocks
- Update to gitlab_git 10.4.1 and take advantage of preserved Ref objects
- Remove delay when hitting "Reply..." button on page with a lot of discussions
- Retrieve rendered HTML from cache in one request
......
......@@ -18,14 +18,11 @@ module Banzai
def highlight_node(node)
language = node.attr('class')
code = node.text
css_classes = "code highlight"
lexer = Rouge::Lexer.find_fancy(language) || Rouge::Lexers::PlainText
formatter = Rouge::Formatters::HTML.new
lexer = lexer_for(language)
begin
code = formatter.format(lexer.lex(code))
code = format(lex(lexer, code))
css_classes << " js-syntax-highlight #{lexer.tag}"
rescue
......@@ -41,14 +38,27 @@ module Banzai
private
# Separate method so it can be instrumented.
def lex(lexer, code)
lexer.lex(code)
end
def format(tokens)
rouge_formatter.format(tokens)
end
def lexer_for(language)
(Rouge::Lexer.find(language) || Rouge::Lexers::PlainText).new
end
def replace_parent_pre_element(node, highlighted)
# Replace the parent `pre` element with the entire highlighted block
node.parent.replace(highlighted)
end
# Override Rouge::Plugins::Redcarpet#rouge_formatter
def rouge_formatter(lexer)
Rouge::Formatters::HTML.new
def rouge_formatter(lexer = nil)
@rouge_formatter ||= Rouge::Formatters::HTML.new
end
end
end
......
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