feat(zon): Brace matching

CHANGELOG.md

@@ -24,6 +24,7 @@ Changelog structure reference:
 - Basic parser and PSI tree
 - Basic syntax highlighting
 - Color settings page
+- Brace matching
 
 ## [0.4.0]
 

src/main/java/com/falsepattern/zigbrains/zon/braces/ZonBraceMatcher.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2023 FalsePattern
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.falsepattern.zigbrains.zon.braces;
+
+import com.falsepattern.zigbrains.zon.psi.ZonTypes;
+import com.intellij.lang.BracePair;
+import com.intellij.lang.PairedBraceMatcher;
+import com.intellij.psi.PsiFile;
+import com.intellij.psi.tree.IElementType;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public class ZonBraceMatcher implements PairedBraceMatcher {
+    public static final BracePair PAIR = new BracePair(ZonTypes.LBRACE, ZonTypes.RBRACE, true);
+    private static final BracePair[] PAIRS = new BracePair[]{PAIR};
+    @Override
+    public BracePair @NotNull [] getPairs() {
+        return PAIRS;
+    }
+
+    @Override
+    public boolean isPairedBracesAllowedBeforeType(@NotNull IElementType lbraceType, @Nullable IElementType contextType) {
+        return true;
+    }
+
+    @Override
+    public int getCodeConstructStart(PsiFile file, int openingBraceOffset) {
+        var theBrace = file.findElementAt(openingBraceOffset);
+        if (theBrace == null) {
+            return openingBraceOffset;
+        }
+        var parent = theBrace.getParent();
+        if (parent == null) {
+            return openingBraceOffset;
+        }
+        return parent.getTextOffset();
+    }
+}

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

@@ -94,6 +94,8 @@
 
         <colorSettingsPage implementation="com.falsepattern.zigbrains.zon.highlight.ZonColorSettingsPage"/>
 
+        <lang.braceMatcher language="Zon"
+                           implementationClass="com.falsepattern.zigbrains.zon.braces.ZonBraceMatcher"/>
         <!-- endregion Zon -->
 
     </extensions>