Start new example; Start new syntax features

examples/guessing_game.ds

@@ -0,0 +1,28 @@
+# This is a Dust version of an example from the Rust Book.
+#
+# https://doc.rust-lang.org/book/ch02-00-guessing-game-tutorial.html
+
+output("Guess the number.")
+
+secret_number = int:random_range(0..=100);
+
+loop {
+	output("Please input your guess.")
+
+	input = io::stdin():expect("Failed to read line.")
+	guess = int:parse(input);
+
+	output("You guessed: " + guess)
+
+	match cmp(guess, secret_number) {
+		Ordering::Less -> output("Too small!"),
+		Ordering::Greater -> output("Too big!"),
+		Ordering::Equal -> {
+			output("You win!");
+			break;
+		}
+	}
+} 
+
+
+

tree-sitter-dust/grammar.js

@@ -31,6 +31,7 @@ module.exports = grammar({
           $.for,
           $.if_else,
           $.index_assignment,
+          $.break_loop,
           $.match,
           $.pipe,
           $.while,
@@ -327,6 +328,12 @@ module.exports = grammar({
         ),
       ),
 
+    break_loop: $ =>
+      seq(
+        'loop',
+        $.block,
+      ),
+
     while: $ =>
       seq(
         'while',

tree-sitter-dust/highlights.scm

@@ -1,20 +1,33 @@
-(expression) @expression
+(statement) @statement
+[
+      (expression)
+      (function_expression)
+      (index_expression)
+] @expression
 (value) @value
 (identifier) @variable
+
 (value) @value
 (string) @string
-
 [
       (integer)
       (float)
 ] @number
-
-(function) @function
-
+[
+      (command)
+      (function)
+] @function
+(range) @range
 (boolean) @boolean
 (list) @list
+(map) @map
 
-["," ":" ";"] @punctuation.delimiter
+(struct_definition) @struct
+(enum_definition) @enum
+ 
+(block) @block
+
+["," ";"] @punctuation.delimiter
 
 [
       "["
@@ -27,30 +40,33 @@
       ")"
 ] @punctuation.bracket
 
-[
-      (type)
-      (type_specification)
-] @type
+(type) @type
 
 (assignment_operator) @operator.assignment
 (logic_operator) @operator.logic
 (math_operator) @operator.math
 
 [
+      "as"
       "async"
+      "break"
       "else"
       "else if"
+      "enum"
       "false"
       "for"
       "if"
       "in"
+      "loop"
       "match"
-      "self"
+      "return"
+      "struct"
       "true"
       "while"
       "->"
-      "=>"
+      ":"
+      "::"
+      "^"
 ] @keyword
 
-(built_in_function) @function.builtin
 (function_call) @function.call