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217 changes: 217 additions & 0 deletions
217
pkgs/sass_language_services/lib/src/features/hover/hover_feature.dart
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,217 @@ | ||
| import 'package:lsp_server/lsp_server.dart' as lsp; | ||
| import 'package:sass_api/sass_api.dart' as sass; | ||
| import 'package:sass_language_services/sass_language_services.dart'; | ||
| import 'package:sass_language_services/src/utils/string_utils.dart'; | ||
|
|
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| import '../../css/css_data.dart'; | ||
| import '../language_feature.dart'; | ||
| import '../node_at_offset_visitor.dart'; | ||
|
|
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| class HoverFeature extends LanguageFeature { | ||
| final _cssData = CssData(); | ||
|
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| HoverFeature({required super.ls}); | ||
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| bool _supportsMarkdown() => | ||
| ls.clientCapabilities.textDocument?.hover?.contentFormat | ||
| ?.any((f) => f == lsp.MarkupKind.Markdown) == | ||
| true || | ||
| ls.clientCapabilities.general?.markdown != null; | ||
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| Future<lsp.Hover?> doHover( | ||
| TextDocument document, lsp.Position position) async { | ||
| var stylesheet = ls.parseStylesheet(document); | ||
| var offset = document.offsetAt(position); | ||
| var visitor = NodeAtOffsetVisitor(offset); | ||
| var result = stylesheet.accept(visitor); | ||
|
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| // The visitor might have reached the end of the syntax tree, | ||
| // in which case result is null. We still might have a candidate. | ||
| var hoverNode = result ?? visitor.candidate; | ||
| if (hoverNode == null) { | ||
| return null; | ||
| } | ||
|
|
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| lsp.Hover? hover; | ||
| for (var i = 0; i < visitor.path.length; i++) { | ||
| var node = visitor.path.elementAt(i); | ||
| if (node is sass.SimpleSelector) { | ||
| return _selectorHover(visitor.path, i); | ||
| } else if (node is sass.Declaration) { | ||
| return _declarationHover(node); | ||
| } | ||
| } | ||
|
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| return hover; | ||
| } | ||
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| lsp.Hover _selectorHover(List<sass.AstNode> path, int index) { | ||
| var (selector, specificity) = _getSelectorHoverValue(path, index); | ||
|
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| if (_supportsMarkdown()) { | ||
| var contents = _asMarkdown('''```scss | ||
| $selector | ||
| ``` | ||
| [Specificity](https://developer.mozilla.org/en-US/docs/Web/CSS/Specificity): ${readableSpecificity(specificity)} | ||
| '''); | ||
| return lsp.Hover(contents: contents); | ||
| } else { | ||
| var contents = _asPlaintext(''' | ||
| $selector | ||
| Specificity: ${readableSpecificity(specificity)} | ||
| '''); | ||
| return lsp.Hover(contents: contents); | ||
| } | ||
| } | ||
|
|
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| /// Go back up the path and calculate a full selector string and specificity. | ||
| (String, int) _getSelectorHoverValue(List<sass.AstNode> path, int index) { | ||
| var selector = ""; | ||
| var specificity = 0; | ||
| var pastImmediateStyleRule = false; | ||
| var lastWasParentSelector = false; | ||
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| for (var i = index; i >= 0; i--) { | ||
| var node = path.elementAt(i); | ||
| if (node is sass.ComplexSelector) { | ||
| var sel = node.span.text; | ||
| if (sel.startsWith('&')) { | ||
| lastWasParentSelector = true; | ||
| selector = "${sel.substring(1)} $selector"; | ||
| specificity += node.specificity; | ||
| } else { | ||
| if (lastWasParentSelector) { | ||
| selector = "$sel$selector"; | ||
| } else { | ||
| selector = "$sel $selector"; | ||
| } | ||
| specificity += node.specificity; | ||
| } | ||
| } else if (node is sass.StyleRule) { | ||
| // Don't add the direct parent StyleRule, | ||
| // otherwise we'll end up with the same selector twice. | ||
| if (!pastImmediateStyleRule) { | ||
| pastImmediateStyleRule = true; | ||
| continue; | ||
| } | ||
|
|
||
| try { | ||
| if (node.selector.isPlain) { | ||
| var selectorList = sass.SelectorList.parse(node.selector.asPlain!); | ||
|
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| // Just pick the first one in case of a list. | ||
| var ruleSelector = selectorList.components.first; | ||
| var selectorString = ruleSelector.toString(); | ||
| if (selectorString.startsWith('&')) { | ||
| lastWasParentSelector = true; | ||
| selector = "${selectorString.substring(1)} $selector"; | ||
| specificity += ruleSelector.specificity; | ||
| continue; | ||
| } else { | ||
| if (lastWasParentSelector) { | ||
| selector = "$selectorString$selector"; | ||
| // subtract one class worth that would otherwise be duplicated | ||
| specificity -= 1000; | ||
| } else { | ||
| selector = "$selectorString $selector"; | ||
| } | ||
| specificity += ruleSelector.specificity; | ||
| } | ||
| } | ||
| } on sass.SassFormatException catch (_) { | ||
| // Do nothing. | ||
| } | ||
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| lastWasParentSelector = false; | ||
| } | ||
| } | ||
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| return (selector.trim(), specificity); | ||
| } | ||
|
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| lsp.Either2<lsp.MarkupContent, String> _asMarkdown(String content) { | ||
| return lsp.Either2.t1( | ||
| lsp.MarkupContent( | ||
| kind: lsp.MarkupKind.Markdown, | ||
| value: content, | ||
| ), | ||
| ); | ||
| } | ||
|
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||
| lsp.Either2<lsp.MarkupContent, String> _asPlaintext(String content) { | ||
| return lsp.Either2.t1( | ||
| lsp.MarkupContent( | ||
| kind: lsp.MarkupKind.PlainText, | ||
| value: content, | ||
| ), | ||
| ); | ||
| } | ||
|
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| Future<lsp.Hover?> _declarationHover(sass.Declaration node) async { | ||
| var data = _cssData.getProperty(node.name.toString()); | ||
| if (data == null) return null; | ||
|
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| var description = data.description; | ||
| var syntax = data.syntax; | ||
|
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| final re = RegExp(r'([A-Z]+)(\d+)?'); | ||
| const browserNames = { | ||
| "E": "Edge", | ||
| "FF": "Firefox", | ||
| "S": "Safari", | ||
| "C": "Chrome", | ||
| "IE": "IE", | ||
| "O": "Opera", | ||
| }; | ||
|
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| if (_supportsMarkdown()) { | ||
| var browsers = data.browsers?.map<String>((b) { | ||
| var matches = re.firstMatch(b); | ||
| if (matches != null) { | ||
| var browser = matches.group(1); | ||
| var version = matches.group(2); | ||
| return "| ${browserNames[browser]} | $version |"; | ||
| } | ||
| return b; | ||
| }).join('\n'); | ||
|
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| var references = data.references | ||
| ?.map<String>((r) => '[${r.name}](${r.uri.toString()})') | ||
| .join('\n'); | ||
| var contents = _asMarkdown(''' | ||
| $description | ||
| Syntax: $syntax | ||
| $references | ||
| | Browser | Since version | | ||
| | -- | -- | | ||
| $browsers | ||
| ''' | ||
| .trim()); | ||
| return lsp.Hover(contents: contents); | ||
| } else { | ||
| var browsers = data.browsers?.map<String>((b) { | ||
| var matches = re.firstMatch(b); | ||
| if (matches != null) { | ||
| var browser = matches.group(1); | ||
| var version = matches.group(2); | ||
| return "${browserNames[browser]} $version"; | ||
| } | ||
| return b; | ||
| }).join(', '); | ||
|
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| var contents = _asPlaintext(''' | ||
| $description | ||
| Syntax: $syntax | ||
| $browsers | ||
| '''); | ||
| return lsp.Hover(contents: contents); | ||
| } | ||
| } | ||
| } |
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