Libraries: Move to Userland/Libraries/

Userland/Libraries/LibGUI/JSSyntaxHighlighter.cpp

@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 2020, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <LibGUI/JSSyntaxHighlighter.h>
+#include <LibGUI/TextEditor.h>
+#include <LibGfx/Font.h>
+#include <LibGfx/Palette.h>
+#include <LibJS/Lexer.h>
+#include <LibJS/Token.h>
+
+namespace GUI {
+
+static TextStyle style_for_token_type(Gfx::Palette palette, JS::TokenType type)
+{
+    switch (JS::Token::category(type)) {
+    case JS::TokenCategory::Invalid:
+        return { palette.syntax_comment() };
+    case JS::TokenCategory::Number:
+        return { palette.syntax_number() };
+    case JS::TokenCategory::String:
+        return { palette.syntax_string() };
+    case JS::TokenCategory::Punctuation:
+        return { palette.syntax_punctuation() };
+    case JS::TokenCategory::Operator:
+        return { palette.syntax_operator() };
+    case JS::TokenCategory::Keyword:
+        return { palette.syntax_keyword(), true };
+    case JS::TokenCategory::ControlKeyword:
+        return { palette.syntax_control_keyword(), true };
+    case JS::TokenCategory::Identifier:
+        return { palette.syntax_identifier() };
+    default:
+        return { palette.base_text() };
+    }
+}
+
+bool JSSyntaxHighlighter::is_identifier(void* token) const
+{
+    auto js_token = static_cast<JS::TokenType>(reinterpret_cast<size_t>(token));
+    return js_token == JS::TokenType::Identifier;
+}
+
+bool JSSyntaxHighlighter::is_navigatable([[maybe_unused]] void* token) const
+{
+    return false;
+}
+
+void JSSyntaxHighlighter::rehighlight(Gfx::Palette palette)
+{
+    ASSERT(m_editor);
+    auto text = m_editor->text();
+
+    JS::Lexer lexer(text);
+
+    Vector<GUI::TextDocumentSpan> spans;
+    GUI::TextPosition position { 0, 0 };
+    GUI::TextPosition start { 0, 0 };
+
+    auto advance_position = [&position](char ch) {
+        if (ch == '\n') {
+            position.set_line(position.line() + 1);
+            position.set_column(0);
+        } else
+            position.set_column(position.column() + 1);
+    };
+
+    auto append_token = [&](StringView str, const JS::Token& token, bool is_trivia) {
+        if (str.is_empty())
+            return;
+
+        start = position;
+        for (size_t i = 0; i < str.length() - 1; ++i)
+            advance_position(str[i]);
+
+        GUI::TextDocumentSpan span;
+        span.range.set_start(start);
+        span.range.set_end({ position.line(), position.column() });
+        auto type = is_trivia ? JS::TokenType::Invalid : token.type();
+        auto style = style_for_token_type(palette, type);
+        span.attributes.color = style.color;
+        span.attributes.bold = style.bold;
+        span.is_skippable = is_trivia;
+        span.data = reinterpret_cast<void*>(static_cast<size_t>(type));
+        spans.append(span);
+        advance_position(str[str.length() - 1]);
+
+#ifdef DEBUG_SYNTAX_HIGHLIGHTING
+        dbg() << token.name() << (is_trivia ? " (trivia) @ \"" : " @ \"") << token.value() << "\" "
+              << span.range.start().line() << ":" << span.range.start().column() << " - "
+              << span.range.end().line() << ":" << span.range.end().column();
+#endif
+    };
+
+    bool was_eof = false;
+    for (auto token = lexer.next(); !was_eof; token = lexer.next()) {
+        append_token(token.trivia(), token, true);
+        append_token(token.value(), token, false);
+
+        if (token.type() == JS::TokenType::Eof)
+            was_eof = true;
+    }
+
+    m_editor->document().set_spans(spans);
+
+    m_has_brace_buddies = false;
+    highlight_matching_token_pair();
+
+    m_editor->update();
+}
+
+Vector<SyntaxHighlighter::MatchingTokenPair> JSSyntaxHighlighter::matching_token_pairs() const
+{
+    static Vector<SyntaxHighlighter::MatchingTokenPair> pairs;
+    if (pairs.is_empty()) {
+        pairs.append({ reinterpret_cast<void*>(JS::TokenType::CurlyOpen), reinterpret_cast<void*>(JS::TokenType::CurlyClose) });
+        pairs.append({ reinterpret_cast<void*>(JS::TokenType::ParenOpen), reinterpret_cast<void*>(JS::TokenType::ParenClose) });
+        pairs.append({ reinterpret_cast<void*>(JS::TokenType::BracketOpen), reinterpret_cast<void*>(JS::TokenType::BracketClose) });
+    }
+    return pairs;
+}
+
+bool JSSyntaxHighlighter::token_types_equal(void* token1, void* token2) const
+{
+    return static_cast<JS::TokenType>(reinterpret_cast<size_t>(token1)) == static_cast<JS::TokenType>(reinterpret_cast<size_t>(token2));
+}
+
+JSSyntaxHighlighter::~JSSyntaxHighlighter()
+{
+}
+
+}