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https://github.com/gjtorikian/commonmarker
Ruby wrapper for the comrak (CommonMark parser) Rust crate
https://github.com/gjtorikian/commonmarker
commonmark html libcmark
Last synced: 11 days ago
JSON representation
Ruby wrapper for the comrak (CommonMark parser) Rust crate
- Host: GitHub
- URL: https://github.com/gjtorikian/commonmarker
- Owner: gjtorikian
- License: mit
- Created: 2015-05-07T04:06:29.000Z (over 9 years ago)
- Default Branch: main
- Last Pushed: 2024-10-11T02:58:08.000Z (about 1 month ago)
- Last Synced: 2024-10-29T16:58:56.129Z (12 days ago)
- Topics: commonmark, html, libcmark
- Language: Rust
- Homepage:
- Size: 3.97 MB
- Stars: 431
- Watchers: 16
- Forks: 83
- Open Issues: 5
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Funding: .github/FUNDING.yml
- License: LICENSE.txt
- Code of conduct: CODE_OF_CONDUCT.txt
Awesome Lists containing this project
README
# Commonmarker
Ruby wrapper for Rust's [comrak](https://github.com/kivikakk/comrak) crate.
It passes all of the CommonMark test suite, and is therefore spec-complete. It also includes extensions to the CommonMark spec as documented in the [GitHub Flavored Markdown spec](http://github.github.com/gfm/), such as support for tables, strikethroughs, and autolinking.
For more information on available extensions, see [the documentation below](#extension-options).
## Installation
Add this line to your application's Gemfile:
gem 'commonmarker'
And then execute:
$ bundle
Or install it yourself as:
$ gem install commonmarker
## Usage
### Converting to HTML
Call `to_html` on a string to convert it to HTML:
```ruby
require 'commonmarker'
Commonmarker.to_html('"Hi *there*"', options: {
parse: { smart: true }
})
# =>
“Hi there”
\n
```
(The second argument is optional--[see below](#options-and-plugins) for more information.)
### Generating a document
You can also parse a string to receive a `:document` node. You can then print that node to HTML, iterate over the children, and do other fun node stuff. For example:
```ruby
require 'commonmarker'
doc = Commonmarker.parse("*Hello* world", options: {
parse: { smart: true }
})
puts(doc.to_html) # =>
Hello world
\n
doc.walk do |node|
puts node.type # => [:document, :paragraph, :emph, :text, :text]
end
```
(The second argument is optional--[see below](#options-and-plugins) for more information.)
When it comes to modifying the document, you can perform the following operations:
- `insert_before`
- `insert_after`
- `prepend_child`
- `append_child`
- `delete`
You can also get the source position of a node by calling `source_position`:
```ruby
doc = Commonmarker.parse("*Hello* world")
puts doc.first_child.first_child.source_position
# => {:start_line=>1, :start_column=>1, :end_line=>1, :end_column=>7}
```
You can also modify the following attributes:
- `url`
- `title`
- `header_level`
- `list_type`
- `list_start`
- `list_tight`
- `fence_info`
#### Example: Walking the AST
You can use `walk` or `each` to iterate over nodes:
- `walk` will iterate on a node and recursively iterate on a node's children.
- `each` will iterate on a node and its children, but no further.
```ruby
require 'commonmarker'
# parse some string
doc = Commonmarker.parse("# The site\n\n [GitHub](https://www.github.com)")
# Walk tree and print out URLs for links
doc.walk do |node|
if node.type == :link
printf("URL = %s\n", node.url)
end
end
# => URL = https://www.github.com
# Transform links to regular text
doc.walk do |node|
if node.type == :link
node.insert_before(node.first_child)
node.delete
end
end
# =>
The site
\nGitHub
\n
```
#### Example: Converting a document back into raw CommonMark
You can use `to_commonmark` on a node to render it as raw text:
```ruby
require 'commonmarker'
# parse some string
doc = Commonmarker.parse("# The site\n\n [GitHub](https://www.github.com)")
# Transform links to regular text
doc.walk do |node|
if node.type == :link
node.insert_before(node.first_child)
node.delete
end
end
doc.to_commonmark
# => # The site\n\nGitHub\n
```
## Options and plugins
### Options
Commonmarker accepts the same parse, render, and extensions options that comrak does, as a hash dictionary with symbol keys:
```ruby
Commonmarker.to_html('"Hi *there*"', options:{
parse: { smart: true },
render: { hardbreaks: false}
})
```
Note that there is a distinction in comrak for "parse" options and "render" options, which are represented in the tables below.
### Parse options
| Name | Description | Default |
| ----------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------- | ------- |
| `smart` | Punctuation (quotes, full-stops and hyphens) are converted into 'smart' punctuation. | `false` |
| `default_info_string` | The default info string for fenced code blocks. | `""` |
| `relaxed_tasklist_matching` | Enables relaxing of the tasklist extension matching, allowing any non-space to be used for the "checked" state instead of only `x` and `X`. | `false` |
| `relaxed_autolinks` | Enable relaxing of the autolink extension parsing, allowing links to be recognized when in brackets, as well as permitting any url scheme. | `false` |
### Render options
| Name | Description | Default |
| -------------------- | ------------------------------------------------------------------------------------------------------ | ------- |
| `hardbreaks` | [Soft line breaks](http://spec.commonmark.org/0.27/#soft-line-breaks) translate into hard line breaks. | `true` |
| `github_pre_lang` | GitHub-style `
` is used for fenced code blocks with info tags. | `true` |
| `full_info_string` | Gives info string data after a space in a `data-meta` attribute on code blocks. | `false` |
| `width` | The wrap column when outputting CommonMark. | `80` |
| `unsafe` | Allow rendering of raw HTML and potentially dangerous links. | `false` |
| `escape` | Escape raw HTML instead of clobbering it. | `false` |
| `sourcepos` | Include source position attribute in HTML and XML output. | `false` |
| `escaped_char_spans` | Wrap escaped characters in span tags. | `true` |
| `ignore_setext` | Ignores setext-style headings. | `false` |
| `ignore_empty_links` | Ignores empty links, leaving the Markdown text in place. | `false` |
| `gfm_quirks` | Outputs HTML with GFM-style quirks; namely, not nesting `` inlines. | `false` |
| `prefer_fenced` | Always output fenced code blocks, even where an indented one could be used. | `false` |
As well, there are several extensions which you can toggle in the same manner:
```ruby
Commonmarker.to_html('"Hi *there*"', options: {
extension: { footnotes: true, description_lists: true },
render: { hardbreaks: false }
})
```
### Extension options
| Name | Description | Default |
| --------------------------- | ------------------------------------------------------------------------------------------------------------------- | ------- |
| `strikethrough` | Enables the [strikethrough extension](https://github.github.com/gfm/#strikethrough-extension-) from the GFM spec. | `true` |
| `tagfilter` | Enables the [tagfilter extension](https://github.github.com/gfm/#disallowed-raw-html-extension-) from the GFM spec. | `true` |
| `table` | Enables the [table extension](https://github.github.com/gfm/#tables-extension-) from the GFM spec. | `true` |
| `autolink` | Enables the [autolink extension](https://github.github.com/gfm/#autolinks-extension-) from the GFM spec. | `true` |
| `tasklist` | Enables the [task list extension](https://github.github.com/gfm/#task-list-items-extension-) from the GFM spec. | `true` |
| `superscript` | Enables the superscript Comrak extension. | `false` |
| `header_ids` | Enables the header IDs Comrak extension. from the GFM spec. | `""` |
| `footnotes` | Enables the footnotes extension per `cmark-gfm`. | `false` |
| `description_lists` | Enables the description lists extension. | `false` |
| `front_matter_delimiter` | Enables the front matter extension. | `""` |
| `multiline_block_quotes` | Enables the multiline block quotes extension. | `false` |
| `math_dollars`, `math_code` | Enables the math extension. | `false` |
| `shortcodes` | Enables the shortcodes extension. | `true` |
| `wikilinks_title_before_pipe` | Enables the wikilinks extension, placing the title before the dividing pipe. | `false` |
| `wikilinks_title_after_pipe` | Enables the shortcodes extension, placing the title after the dividing pipe. | `false` |
| `underline` | Enables the underline extension. | `false` |
| `spoiler` | Enables the spoiler extension. | `false` |
| `greentext` | Enables the greentext extension. | `false` |
For more information on these options, see [the comrak documentation](https://github.com/kivikakk/comrak#usage).
### Plugins
In addition to the possibilities provided by generic CommonMark rendering, Commonmarker also supports plugins as a means of
providing further niceties.
#### Syntax Highlighter Plugin
The library comes with [a set of pre-existing themes](https://docs.rs/syntect/5.0.0/syntect/highlighting/struct.ThemeSet.html#implementations) for highlighting code:
- `"base16-ocean.dark"`
- `"base16-eighties.dark"`
- `"base16-mocha.dark"`
- `"base16-ocean.light"`
- `"InspiredGitHub"`
- `"Solarized (dark)"`
- `"Solarized (light)"`
````ruby
code = <<~CODE
```ruby
def hello
puts "hello"
end
```
CODE
# pass in a theme name from a pre-existing set
puts Commonmarker.to_html(code, plugins: { syntax_highlighter: { theme: "InspiredGitHub" } })
#
# def hello
# puts "hello"
# end
#
#
````
By default, the plugin uses the `"base16-ocean.dark"` theme to syntax highlight code.
To disable this plugin, set the value to `nil`:
````ruby
code = <<~CODE
```ruby
def hello
puts "hello"
end
```
CODE
Commonmarker.to_html(code, plugins: { syntax_highlighter: nil })
#
def hello
# puts "hello"
# end
#
````
To output CSS classes instead of `style` attributes, set the `theme` key to `""`:
````ruby
code = <<~CODE
```ruby
def hello
puts "hello"
end
CODE
Commonmarker.to_html(code, plugins: { syntax_highlighter: { theme: "" } })
#
# puts "hello"
# end\n
````
To use a custom theme, you can provide a `path` to a directory containing `.tmtheme` files to load:
```ruby
Commonmarker.to_html(code, plugins: { syntax_highlighter: { theme: "Monokai", path: "./themes" } })
```
## Output formats
Commonmarker can currently only generate output in one format: HTML.
### HTML
```ruby
puts Commonmarker.to_html('*Hello* world!')
#
Hello world!
```
## Developing locally
After cloning the repo:
```
script/bootstrap
bundle exec rake compile
```
If there were no errors, you're done! Otherwise, make sure to follow the comrak dependency instructions.
## Benchmarks
```
❯ bundle exec rake benchmark
input size = 11064832 bytes
ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [arm64-darwin23]
Warming up --------------------------------------
Markly.render_html 1.000 i/100ms
Markly::Node#to_html 1.000 i/100ms
Commonmarker.to_html 1.000 i/100ms
Commonmarker::Node.to_html
1.000 i/100ms
Kramdown::Document#to_html
1.000 i/100ms
Calculating -------------------------------------
Markly.render_html 15.606 (±25.6%) i/s - 71.000 in 5.047132s
Markly::Node#to_html 15.692 (±25.5%) i/s - 72.000 in 5.095810s
Commonmarker.to_html 4.482 (± 0.0%) i/s - 23.000 in 5.137680s
Commonmarker::Node.to_html
5.092 (±19.6%) i/s - 25.000 in 5.072220s
Kramdown::Document#to_html
0.379 (± 0.0%) i/s - 2.000 in 5.277770s
Comparison:
Markly::Node#to_html: 15.7 i/s
Markly.render_html: 15.6 i/s - same-ish: difference falls within error
Commonmarker::Node.to_html: 5.1 i/s - 3.08x slower
Commonmarker.to_html: 4.5 i/s - 3.50x slower
Kramdown::Document#to_html: 0.4 i/s - 41.40x slower
```