JSON support

Author: pponec

utils/PPUtils.java

@@ -120,6 +120,11 @@ void start(Array<String> args) throws Exception {
             case "base64decode" -> {
                 new Converters(out).convertBase64(args.get(1).orElse(""), false);
             }
+            case "json" -> {
+                final var key = args.get(1).orElse("");
+                final var json = Files.readString(Path.of(args.get(2).orElse("?")));
+                out.println(Json.of(json).get(key).orElse(""));
+            }
             case "upgrade" -> {
                 new Utilities().download();
             }
@@ -271,7 +276,7 @@ class Utilities {
         /** Compile the script and build it to the executable JAR file */
         private void compile() throws Exception {
             if (isJar()) {
-                System.out.printf("Use the statement rather: java %s.java c %s".formatted(appName));
+                out.printf("Use the statement rather: java %s.java c %s".formatted(appName));
                 System.exit(1);
             }
 
@@ -379,7 +384,7 @@ private void download() throws IOException, InterruptedException {
 
         private void removePackage(Path fullJavaClass) throws IOException {
             var packageRegexp = "package %s;".formatted(mainClass.getPackageName());
-            System.out.println("packageRegexp: "  + packageRegexp);
+            out.println("packageRegexp: "  + packageRegexp);
             var script = Files.readString(fullJavaClass);
             script = script.replaceFirst(packageRegexp, "");
             Files.writeString(fullJavaClass, script);
@@ -472,7 +477,7 @@ public static <T> Array<T> of(T... chars) {
         }
     }
 
-    /** JSON parser */
+    /** JSON parser. The {@code array} type is not supported. */
     public static class Json {
         static final Pattern keyPattern = Pattern.compile("\"(.*?)\"\\s*:\\s*(\".*?\"|\\d+\\.?\\d*|true|false|null|\\{.*?\\})");
         final Map<String, Object> map;
@@ -514,5 +519,10 @@ public Optional<Object> get(String keys) {
             }
             return Optional.ofNullable(result);
         }
+
+        @Override
+        public String toString() {
+            return map.toString();
+        }
     }
 }

utils/PPUtilsTest.java

@@ -5,6 +5,7 @@
 import static org.junit.jupiter.api.Assertions.*;
 
 class PPUtilsTest {
+    private final String undef = "?";
 
     @Test
     void jsonTest() {
@@ -15,6 +16,7 @@ void jsonTest() {
                 , "d": true
                 , "e": null
                 , "f": { "g": "G", "h": 2 }
+                , "z": ["x", "y"]
                 }
                 """;
 
@@ -26,10 +28,12 @@ void jsonTest() {
         assertEquals(map.get("e").orElse(null), null);
         assertEquals(map.get("f.g").get(), "G");
         assertEquals(map.get("f.h").get(), 2L);
+        assertEquals(map.get("f").get().toString(), "{g=G, h=2}");
 
-        assertEquals(map.get("x").orElse("X"), "X");
-        assertEquals(map.get("x.y").orElse("Y"), "Y");
-        assertEquals(map.get("a.z").orElse("Z"), "Z");
+        assertEquals(map.get("x").orElse(undef), undef);
+        assertEquals(map.get("x.y").orElse(undef), undef);
+        assertEquals(map.get("a.z").orElse(undef), undef);
+        assertEquals(map.get("z").orElse(undef), undef);
     }
 
 }

utils/json.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+# Sample script to parse a JSON
+
+set -e
+cd $(dirname "$0")
+version=$(java PPUtils.java json version package.json)
+echo "Version: $version"

utils/package.json

@@ -1,5 +1,6 @@
 {
-  "devDependencies": {
-    "@types/node": "^20.10.5"
+  "name": "DirectoryBookmarks",
+  "version": "1.0.0",
+  "dependencies": {
   }
 }