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LibWebView: Highlight CSS and JS in view-source

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The colors and categories here could probably be better, but it works.
:^)
This commit is contained in:
Sam Atkins 2024-09-24 16:30:23 +01:00 committed by Sam Atkins
parent 66c39f3da4
commit bd6fdbf312
Notes: github-actions[bot] 2024-09-30 07:54:36 +00:00 
Author: https://github.com/AtkinsSJ
Commit: https://github.com/LadybirdBrowser/ladybird/commit/bd6fdbf312b
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/1513
2 changed files with 135 additions and 17 deletions
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103
Userland/Libraries/LibWebView/SourceHighlighter.cpp
View file

@ -6,7 +6,11 @@
*/
#include <AK/StringBuilder.h>
#include <LibJS/SyntaxHighlighter.h>
#include <LibJS/Token.h>
#include <LibURL/URL.h>
#include <LibWeb/CSS/Parser/Token.h>
#include <LibWeb/CSS/SyntaxHighlighter/SyntaxHighlighter.h>
#include <LibWeb/HTML/SyntaxHighlighter/SyntaxHighlighter.h>
#include <LibWebView/SourceHighlighter.h>
@ -40,9 +44,15 @@ SourceHighlighterClient::SourceHighlighterClient(StringView source, Syntax::Lang
Gfx::Palette dummy_palette { palette_impl };
switch (language) {
case Syntax::Language::CSS:
m_highlighter = make<Web::CSS::SyntaxHighlighter>();
break;
case Syntax::Language::HTML:
m_highlighter = make<Web::HTML::SyntaxHighlighter>();
break;
case Syntax::Language::JavaScript:
m_highlighter = make<JS::SyntaxHighlighter>();
break;
default:
break;
}
@ -111,6 +121,86 @@ String highlight_source(URL::URL const& url, StringView source)
StringView SourceHighlighterClient::class_for_token(u64 token_type) const
{
auto class_for_css_token = [](u64 token_type) {
switch (static_cast<Web::CSS::Parser::Token::Type>(token_type)) {
case Web::CSS::Parser::Token::Type::Invalid:
case Web::CSS::Parser::Token::Type::BadString:
case Web::CSS::Parser::Token::Type::BadUrl:
return "invalid"sv;
case Web::CSS::Parser::Token::Type::Ident:
return "identifier"sv;
case Web::CSS::Parser::Token::Type::Function:
return "function"sv;
case Web::CSS::Parser::Token::Type::AtKeyword:
return "at-keyword"sv;
case Web::CSS::Parser::Token::Type::Hash:
return "hash"sv;
case Web::CSS::Parser::Token::Type::String:
return "string"sv;
case Web::CSS::Parser::Token::Type::Url:
return "url"sv;
case Web::CSS::Parser::Token::Type::Number:
case Web::CSS::Parser::Token::Type::Dimension:
case Web::CSS::Parser::Token::Type::Percentage:
return "number"sv;
case Web::CSS::Parser::Token::Type::Whitespace:
return "whitespace"sv;
case Web::CSS::Parser::Token::Type::Delim:
case Web::CSS::Parser::Token::Type::Colon:
case Web::CSS::Parser::Token::Type::Semicolon:
case Web::CSS::Parser::Token::Type::Comma:
case Web::CSS::Parser::Token::Type::OpenSquare:
case Web::CSS::Parser::Token::Type::CloseSquare:
case Web::CSS::Parser::Token::Type::OpenParen:
case Web::CSS::Parser::Token::Type::CloseParen:
case Web::CSS::Parser::Token::Type::OpenCurly:
case Web::CSS::Parser::Token::Type::CloseCurly:
return "delimiter"sv;
case Web::CSS::Parser::Token::Type::CDO:
case Web::CSS::Parser::Token::Type::CDC:
return "comment"sv;
case Web::CSS::Parser::Token::Type::EndOfFile:
default:
break;
}
return ""sv;
};
auto class_for_js_token = [](u64 token_type) {
auto category = JS::Token::category(static_cast<JS::TokenType>(token_type));
switch (category) {
case JS::TokenCategory::Invalid:
return "invalid"sv;
case JS::TokenCategory::Number:
return "number"sv;
case JS::TokenCategory::String:
return "string"sv;
case JS::TokenCategory::Punctuation:
return "punctuation"sv;
case JS::TokenCategory::Operator:
return "operator"sv;
case JS::TokenCategory::Keyword:
return "keyword"sv;
case JS::TokenCategory::ControlKeyword:
return "control-keyword"sv;
case JS::TokenCategory::Identifier:
return "identifier"sv;
default:
break;
}
return ""sv;
};
switch (m_highlighter->language()) {
case Syntax::Language::CSS:
return class_for_css_token(token_type);
case Syntax::Language::JavaScript:
return class_for_js_token(token_type);
case Syntax::Language::HTML: {
// HTML has nested CSS and JS highlighters, so we have to decode their token types.
// HTML
if (token_type < Web::HTML::SyntaxHighlighter::JS_TOKEN_START_VALUE) {
switch (static_cast<Web::HTML::AugmentedTokenKind>(token_type)) {
case Web::HTML::AugmentedTokenKind::AttributeName:
return "attribute-name"sv;
@ -125,10 +215,21 @@ StringView SourceHighlighterClient::class_for_token(u64 token_type) const
return "doctype"sv;
case Web::HTML::AugmentedTokenKind::__Count:
default:
break;
return ""sv;
}
}
// JS
if (token_type < Web::HTML::SyntaxHighlighter::CSS_TOKEN_START_VALUE) {
return class_for_js_token(token_type - Web::HTML::SyntaxHighlighter::JS_TOKEN_START_VALUE);
}
// CSS
return class_for_css_token(token_type - Web::HTML::SyntaxHighlighter::CSS_TOKEN_START_VALUE);
}
default:
return "unknown"sv;
}
}
static String generate_style()

17
Userland/Libraries/LibWebView/SourceHighlighter.h
View file

@ -84,6 +84,8 @@ constexpr inline StringView HTML_HIGHLIGHTER_STYLE = R"~~~(
--name-color: orange;
--value-color: deepskyblue;
--internal-color: darkgrey;
--string-color: goldenrod;
--error-color: red;
}
}
@ -94,6 +96,8 @@ constexpr inline StringView HTML_HIGHLIGHTER_STYLE = R"~~~(
--name-color: darkorange;
--value-color: blue;
--internal-color: dimgrey;
--string-color: darkgoldenrod;
--error-color: darkred;
}
}
@ -118,6 +122,19 @@ constexpr inline StringView HTML_HIGHLIGHTER_STYLE = R"~~~(
.internal {
color: var(--internal-color);
}
.invalid {
color: var(--error-color);
text-decoration: currentColor wavy underline;
}
.at-keyword, .function, .keyword, .control-keyword, .url {
color: var(--keyword-color);
}
.number, .hash {
color: var(--value-color);
}
.string {
color: var(--string-color);
}
)~~~"sv;
}