Implemented more methods

Author: Lenni0451

MCStructs-snbt/src/main/java/net/lenni0451/mcstructs/snbt/impl/v1_12/StringReader_v1_12.java

@@ -47,6 +47,30 @@ public void skipWhitespaces() {
         while (this.canRead() && Character.isWhitespace(this.peek())) this.index++;
     }
 
+    public int readInt() throws SNbtDeserializeException {
+        int start = this.index;
+        while (this.canRead() && this.isNumerical(this.peek())) this.index++;
+        String number = this.s.substring(start, this.index);
+        if (number.isEmpty()) throw new SNbtDeserializeException("Expected double but got nothing", this.s, this.index);
+        try {
+            return Integer.parseInt(number);
+        } catch (NumberFormatException e) {
+            throw new SNbtDeserializeException("Expected double but got '" + number + "'", this.s, start);
+        }
+    }
+
+    public double readDouble() throws SNbtDeserializeException {
+        int start = this.index;
+        while (this.canRead() && this.isNumerical(this.peek())) this.index++;
+        String number = this.s.substring(start, this.index);
+        if (number.isEmpty()) throw new SNbtDeserializeException("Expected double but got nothing", this.s, this.index);
+        try {
+            return Double.parseDouble(number);
+        } catch (NumberFormatException e) {
+            throw new SNbtDeserializeException("Expected double but got '" + number + "'", this.s, start);
+        }
+    }
+
     public String readString() throws SNbtDeserializeException {
         this.skipWhitespaces();
         if (!this.canRead()) return null;
@@ -95,6 +119,10 @@ protected boolean isQuote(final char c) {
         return c == '"';
     }
 
+    private boolean isNumerical(final char c) {
+        return c >= '0' && c <= '9' || c == '.' || c == '-';
+    }
+
     private boolean isAlphanumeric(final char c) {
         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '_' || c == '-' || c == '.' || c == '+';
     }