CSS Navigation - VSCode Extension
Allows Go to Definition from HTML to CSS, provides Completion and Workspace Symbols for class & id name, and supports Find References from CSS to HTML.
Go to Definition and Peek Definition
In a HTML document, choose
Go to definition or
Peek definition, the extension will search related CSS & Scss & Less selectors in current workspace folder. Can also search selectors within nesting reference
&... for Sass & Less.
The places you can find definitions:
- HTML (or files whose extension specified by
activeHTMLFileExtensions option): <
- JSX & TSX: className="
Note that the JSX template doesn't provide completion for attribute value by default, you may trigger it manually by clicking
Ctrl + Space, or change settings:
Allows to search workspace symbols in CSS & Scss & Less files across all activated workspace folders.
Class Name and ID Completion
Provides class name and id completion for your HTML files.
Not that the extension doesn't support remote sources, and doesn't follow the
<link> tags in your HTML file to limit the completion results, it just lists all the defined class & id name in CSS & Scss & Less files in your workspace folders.
Find All References and Peek References
Supports looking for CSS selector references in your HTML files.
This functionality should not be very usefull, and it needs to load and parse all the files configured in
activeHTMLFileExtensions additionally. but if you love examining and refactoring CSS codes, at least it's much better than searching them in folders.
Why started this project
At beginning, this project is a fork from vscode-css-peek, which uses vscode-css-languageservice as CSS parser, I just fixed some Scss nesting reference issues.
Then I found it eats so much CPU & memory. E.g., one of my project has 280 CSS files out of 5500 files, includes 6 MB codes. On my MacBook Pro, it needs 7s to load (1.3s to search files and 6s to parse), and uses 700 MB memory. Otherwise it keeps parsing files every time you input a character, if CSS document is more than 100 KB, CPU usage will keep high when inputing.
Finally I decided to implement a new css parser, which also supports Scss & Less naturally, as a result I created a new extension. The CSS parser is very simple and not 100% strict, but it's fast and very easy to extand. Now it costs about 0.8s to search files, and 0.5s to parse them. Memory usage in caching parsed results is only about 40 MB.
Otherwise, all the functionality will be started only when required by default, so CSS files are loaded only when you begin to search definitions or others. You may change this behavior by specify
After files loaded, The extension will track file and directory changes, creations, removals automatically, and reload them if needed.
Further more, I found the extension can support class name and id completion by the same core, so I do it with very few codes.
Finding references uses another core, I implement it because my work have a heavy CSS part, and I love refactoring CSS codes. I believe few people would need it.
Stress Test & Performance
I loaded 100 MB (0.9 M declarations, 2.8 M lines) CSS files for stress test, it took 8s to parse them, and used about 850 MB memory. After 1 minute, the memory usage fell back to 550 MB. Searching definitions across all 0.9 M declarations cost about 50ms, searching workspace symbols cost about 500ms, and searching completions cost about 230ms.
My environment is Win10, MacBook Pro 2014 version, with power on.
Plans & More
I just switched from Sublime Text to VSCode, and I love VSCode so much.
I have plans to make this extension grow, I hope it can serve more frontend developers like me.
So please give me your feedback. Thanks.
|The languages of the html files, in where you can
go to definition. Default value is
["html", "ejs", "erb", "php", "hbs", "js", "ts", "jsx", "tsx", "vue", "twig"].
|The extensions of the CSS files, only the matched files you can
go to and
peek. Default value is
["css", "less", "scss"]. Currently not support other languages, you can specify more extensions, but the related files will be parsed as CSS.
|A glob pattern, defines paths to exclude from when searching for CSS definitions. Default value is
["**/node_modules/**", "**/bower_components/**", "**/vendor/**", "**/coverage/**"].
false by default. When set to
true, will also search CSS definitions in
<style> tag for current document.
false by default, only search CSS definition in current workspace folder. If your workspace folder requires css references from another workspace folder in current worksapce, you should set this to
false by default, CSS files are loaded only when required, that's why you need to wait for a while when searching for definitions at the first time. By set it to
true, CSS files are loaded immediately after you change and save it or VSCode startup. If you are a heavy user in CSS definition searching, just check it.
true by default, e.g.: If 'the-name.scss and 'the-name.css', which share the same basename, are exist in the same directory, the 'the-name.css' will be skipped. If you prefer compiling Scss or Less file to the same name CSS file, this would be very helpful.
true by default, custom element definitions in CSS will be ignored, such that it will go to it's defined place directly.
|Specifies it to ignore files and directories list in
.npmignore when looking for css definitions. Default value is
|A glob pattern, files matched will always be included even they match
excludeGlobPatterns or listed in
Can I change definition order to make sass files always before the css files?
No, VSCode always sort the definition results, seems in name order. If you don't like duplicate css definitions, you can remove the
activeCSSFileExtensions option, or compile css file to the same folder, and keep
From version 1.3.0 there is a
ignoreFilesBy option, you may specify to ignore css files listed in your
Need to wait when I go to definition for the first time after workspace startup.
Everything work on lazy mode by default, so it will not take up CPU and memory early. Set
true will cause CSS files are loaded before your need it, So you will get results immediately even for the first time. Note that you may still wait for other extensions to find definitions.
Can't get definitions across all workspace folders.
By default, definition searching is limited in the same workspace folder, that means when you choose
Go to definition in a html file, the definitions you got are always come from the same workspace folder where the html file in. Searching references, completions also works like this.
If you have more than one folders in your workspace, and you definitely need to find definitions across them, set
Missed some workspace symbols.
Workspace symbols are always come from multiple workspace folders, but for each workspace folder, you need to open one HTML or CSS file to activate it, then it will return results belong to it.
true will also activate services for all workspace folders as soon as possibile, then you will get full workspace symbols always.
How the extension filter the selectors?
This extension only compare the last part of the selector, the parts are defined by spliting selector by space or several other characters like
So when you are trying to find definitions for
class="class1", these selectors will match:
Searching tag definition is a little different, it must be the unique part of the selector, which means
p will not match
div p, but matches
p:hover. This can prevent you got so many results.
Searching completion works in the same way.
Searching workspace symbols have a more strict rule than other extensions, which requires the start word boundary must match.
It sounds like a good idea. For a complete static project, It should be very easy to follow
<link> tags, matching whole selector is much harder, but it can also be done.
But the Web architecture is extremely complex today, all you got in your hand may be just a piece of html codes, an unique class name, which cause we can't get enough infomation about the context.
My suggestion is using unique class name, avoid nesting, which would be also helpful for the code quality of you project.
If you prefer scoped style, and write html and css codes in the same file, searching definitions should be less important for you. But checking option
alsoSearchDefinitionsInStyleTag will help you to search css definitions in the
<style> inside your current document.