New TypeQL code style: patterns and constraints are printed on new, indented lines

Author: haikalpribadi

common/TypeQLToken.java

@@ -22,6 +22,8 @@
 package com.vaticle.typeql.lang.common;
 
 import com.vaticle.typeql.lang.common.exception.TypeQLException;
+import java.util.stream.Collector;
+import java.util.stream.Collectors;
 import static com.vaticle.typedb.common.util.Objects.className;
 import static com.vaticle.typeql.lang.common.exception.ErrorMessage.INVALID_CASTING;
 
@@ -116,9 +118,11 @@ public enum Char {
         EQUAL("="),
         COLON(":"),
         SEMICOLON(";"),
+        SEMICOLON_NEW_LINE(";\n"),
         SPACE(" "),
         COMMA(","),
         COMMA_SPACE(", "),
+        COMMA_NEW_LINE(",\n"),
         CURLY_OPEN("{"),
         CURLY_CLOSE("}"),
         PARAN_OPEN("("),
@@ -128,6 +132,7 @@ public enum Char {
         QUOTE_DOUBLE("\""),
         QUOTE_SINGLE("'"),
         NEW_LINE("\n"),
+        INDENTATION("    "),
         UNDERSCORE("_"),
         $_("$_"),
         $("$");
@@ -138,6 +143,10 @@ public enum Char {
             this.character = character;
         }
 
+        public Collector<CharSequence, ?, String> joiner() {
+            return Collectors.joining(character);
+        }
+
         @Override
         public String toString() {
             return this.character;

common/util/Strings.java

@@ -23,7 +23,10 @@
 
 import java.text.DecimalFormat;
 import java.text.DecimalFormatSymbols;
+import java.util.Arrays;
 import java.util.Locale;
+import static com.vaticle.typeql.lang.common.TypeQLToken.Char.INDENTATION;
+import static com.vaticle.typeql.lang.common.TypeQLToken.Char.NEW_LINE;
 
 public class Strings {
 
@@ -43,6 +46,14 @@ public static String quoteString(String string) {
         return "\"" + string + "\"";
     }
 
+    public static String indent(Object object) {
+        return indent(object.toString());
+    }
+
+    public static String indent(String string) {
+        return Arrays.stream(string.split("\n")).map(s -> INDENTATION + s).collect(NEW_LINE.joiner());
+    }
+
     /**
      * @param value a value in the graph
      * @return the string representation of the value (using quotes if it is already a string)