Initial commit

pom.xml

@@ -17,7 +17,7 @@
  <dependency>
  <groupId>org.antlr</groupId>
  <artifactId>antlr4-runtime</artifactId>
- <version>4.7.2</version>
+ <version>4.9.1</version>
  </dependency>
  </dependencies>
 

src/main/java/com/devik/Main.java

@@ -2,6 +2,7 @@
 
 import antlr.JsonLexer;
 import antlr.JsonParser;
+import json.JsonObject;
 import org.antlr.v4.runtime.ANTLRFileStream;
 import org.antlr.v4.runtime.CharStream;
 import org.antlr.v4.runtime.CommonTokenStream;
@@ -12,7 +13,21 @@ public class Main {
 
  public static void main(String[] args) throws IOException {
 
-
-
+ String json_string= """
+ {
+ "name": "name",
+ "age": 50,
+ "address": {
+ "vill": "village",
+ "tehsil": "tehsil",
+ "dis": "District",
+ "pin": 780968
+ }
+ }
+ """;
+ JsonObject obj=JsonObject.getFromString(json_string);
+// System.out.println(obj);
+ System.out.println(obj);
+ System.out.println(obj.getObject("address"));
  }
 }

src/main/java/json/JsonObject.java

@@ -5,6 +5,8 @@
 import json.core.JsonParserTree;
 
 import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
 
@@ -36,7 +38,7 @@ public String getString(String key) {
  if (value == null)
  return null;
  else if (JsonParser.ValueContext.class.isInstance(value)) {
- String str = String.valueOf(value);
+ String str =((JsonParser.ValueContext)value).getText();
  return str.substring(1, str.length() - 1);
  } else
  throw new InvalidCastException("looking for Number but found other type object.");
@@ -97,6 +99,15 @@ public boolean exists(String key) {
  @Override
  public String toString() {
  StringBuilder sb = new StringBuilder();
- return map.entrySet().stream().map(x -> "\"" + x.getKey() + "\":" + x.getValue().toString()).collect(Collectors.joining(",", "{", "}"));
+ return map.entrySet().stream().map(entry->{
+ if(String.class.isInstance(entry.getValue()))
+ return "\""+entry.getKey()+"\":\""+((JsonParser.ValueContext)entry.getValue()).getText()+"\"";
+ else if(JsonParser.ObjectContext.class.isInstance(entry.getValue()))
+ return "\""+entry.getKey()+"\":"+new JsonObject((JsonParser.ObjectContext)entry.getValue()).toString();
+ else if(JsonParser.ArrayContext.class.isInstance(entry.getValue()))
+ return "\""+entry.getKey()+"\":"+new JsonArray((JsonParser.ArrayContext)entry.getValue()).toString();
+ return ""+entry.getKey()+"\":"+((JsonParser.ValueContext)entry.getValue()).getText();
+ }).collect(Collectors.joining(",", "{", "}"));
+
  }
 }