feat(zon): Simple syntax highlighting

CHANGELOG.md

@@ -22,6 +22,7 @@ Changelog structure reference:
 
 #### Zon
 - Basic parser and PSI tree
+- Basic syntax highlighting
 
 ## [0.4.0]
 

src/main/java/com/falsepattern/zigbrains/zon/highlight/ZonSyntaxHighlighter.java

@@ -0,0 +1,69 @@
+package com.falsepattern.zigbrains.zon.highlight;
+
+import com.falsepattern.zigbrains.zon.lexer.ZonLexerAdapter;
+import com.falsepattern.zigbrains.zon.psi.ZonTypes;
+import com.intellij.lexer.Lexer;
+import com.intellij.openapi.editor.DefaultLanguageHighlighterColors;
+import com.intellij.openapi.editor.HighlighterColors;
+import com.intellij.openapi.editor.colors.TextAttributesKey;
+import com.intellij.openapi.fileTypes.SyntaxHighlighterBase;
+import com.intellij.psi.TokenType;
+import com.intellij.psi.tree.IElementType;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class ZonSyntaxHighlighter extends SyntaxHighlighterBase {
+    // @formatter: off
+    public static final TextAttributesKey
+        EQ       = createKey("EQ"           , DefaultLanguageHighlighterColors.OPERATION_SIGN),
+        ID       = createKey("ID"           , DefaultLanguageHighlighterColors.INSTANCE_FIELD),
+        COMMENT  = createKey("COMMENT"      , DefaultLanguageHighlighterColors.LINE_COMMENT  ),
+        BAD_CHAR = createKey("BAD_CHARACTER", HighlighterColors.BAD_CHARACTER                ),
+        STRING   = createKey("STRING"       , DefaultLanguageHighlighterColors.STRING        ),
+        COMMA    = createKey("COMMA"        , DefaultLanguageHighlighterColors.COMMA         ),
+        DOT      = createKey("DOT"          , DefaultLanguageHighlighterColors.DOT           ),
+        BRACE    = createKey("BRACE"        , DefaultLanguageHighlighterColors.BRACES        );
+    // @formatter: on
+
+    private static final TextAttributesKey[] EMPTY_KEYS = new TextAttributesKey[0];
+    private static final Map<IElementType, TextAttributesKey[]> KEYMAP = new HashMap<>();
+
+    static {
+        // @formatter: off
+        addMapping(DOT     , ZonTypes.DOT);
+        addMapping(COMMA   , ZonTypes.COMMA);
+        addMapping(BRACE   , ZonTypes.LBRACE);
+        addMapping(BRACE   , ZonTypes.RBRACE);
+        addMapping(STRING  , ZonTypes.LINE_STRING, ZonTypes.STRING_LITERAL_SINGLE);
+        addMapping(BAD_CHAR, TokenType.BAD_CHARACTER);
+        addMapping(COMMENT , ZonTypes.COMMENT);
+        addMapping(ID      , ZonTypes.ID);
+        addMapping(EQ      , ZonTypes.EQ);
+        // @formatter: on
+    }
+
+    private static void addMapping(TextAttributesKey key, IElementType... types) {
+        for (var type: types) {
+            KEYMAP.put(type, new TextAttributesKey[]{key});
+        }
+    }
+
+    private static TextAttributesKey createKey(String name, TextAttributesKey fallback) {
+        return TextAttributesKey.createTextAttributesKey("ZON_" + name, fallback);
+    }
+
+    @Override
+    public @NotNull Lexer getHighlightingLexer() {
+        return new ZonLexerAdapter();
+    }
+
+    @Override
+    public TextAttributesKey @NotNull [] getTokenHighlights(IElementType tokenType) {
+        if (KEYMAP.containsKey(tokenType)) {
+            return KEYMAP.get(tokenType);
+        }
+        return EMPTY_KEYS;
+    }
+}

src/main/java/com/falsepattern/zigbrains/zon/highlight/ZonSyntaxHighlighterFactory.java

@@ -0,0 +1,15 @@
+package com.falsepattern.zigbrains.zon.highlight;
+
+import com.intellij.openapi.fileTypes.SyntaxHighlighter;
+import com.intellij.openapi.fileTypes.SyntaxHighlighterFactory;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.vfs.VirtualFile;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public class ZonSyntaxHighlighterFactory extends SyntaxHighlighterFactory {
+    @Override
+    public @NotNull SyntaxHighlighter getSyntaxHighlighter(@Nullable Project project, @Nullable VirtualFile virtualFile) {
+        return new ZonSyntaxHighlighter();
+    }
+}

src/main/resources/META-INF/plugin.xml

@@ -88,6 +88,9 @@
 
         <lang.parserDefinition language="Zon"
                                implementationClass="com.falsepattern.zigbrains.zon.parser.ZonParserDefinition"/>
+
+        <lang.syntaxHighlighterFactory language="Zon"
+                                       implementationClass="com.falsepattern.zigbrains.zon.highlight.ZonSyntaxHighlighterFactory"/>
         <!-- endregion Zon -->
 
     </extensions>