Add syntax example file

example/syntax.wren

@@ -0,0 +1,158 @@
+// This file provides examples of syntactic constructs in wren, which is mainly
+// interesting for testing syntax highlighters.
+
+// This is a comment.
+/* This is /* a nested */ comment. */
+
+// Class definition with a toplevel name.
+class SyntaxExample {
+  // Constructor
+  new {
+    // toplevel name `IO`
+    IO.print("I am a constructor!")
+    // method calls
+    variables
+    fields()
+    // static method call
+    SyntaxExample.fields(1)
+  }
+
+  // Constructor with arguments
+  new(a, b) {
+    print(a, b)
+    field = a
+  }
+
+  // Method without arguments
+  variables {
+    // Valid local variable names.
+    var hi
+    var camelCase
+    var PascalCase
+    var abc123
+    var ALL_CAPS
+  }
+
+  // Method with empty argument list
+  fields() {
+    // Fields
+    _under_score = 1
+    _field = 2
+  }
+
+  // Static method with single argument
+  static fields(a) {
+    // Static field
+    __a = a
+  }
+
+  // setter
+  field=(value) { _field = value }
+
+  // Method with arguments
+  print(a, b) { IO.print(a + b) }
+}
+
+// `class`, `is`
+class ReservedWords is SyntaxExample {
+  // `new`
+  new {
+    // `super`, `true`, `false`
+    super(true, false)
+    // `this`
+    this.foo
+    // `new`
+    new SyntaxExample
+  }
+
+  foo {
+    // `var`
+    var n = 27
+    // `while`, `if`, `else`
+    while (n != 1) if (n % 2 == 0) n = n / 2 else n = 3 * n + 1
+
+    // `for`, `in`
+    for (beatle in ["george", "john", "paul", "ringo"]) {
+      IO.print(beatle)
+      // `break`
+      break
+    }
+
+    // `return`, `null`
+    return null
+  }
+
+  imports {
+    // `import`
+    import "hello"
+    // `import`, `for`
+    import "set" for Set
+  }
+
+  // `foreign`, `static`
+  foreign static bar
+  foreign baz(string)
+  // (Remove lines above to make this file compile)
+}
+
+class literals is SyntaxExample {
+  booleans { true || false }
+  numbers {
+    0
+    1234
+    -5678
+    3.14159
+    1.0
+    -12.34
+    0xdeadbeef
+    0x1234567890ABCDEF
+  }
+  strings {
+    "hi there"
+    // Escapes:
+    "\0" // The NUL byte: 0.
+    "\"" // A double quote character.
+    "\\" // A backslash.
+    "\a" // Alarm beep. (Who uses this?)
+    "\b" // Backspace.
+    "\f" // Formfeed.
+    "\n" // Newline.
+    "\r" // Carriage return.
+    "\t" // Tab.
+    "\v" // Vertical tab.
+    // Unicode code points
+    IO.print("\u0041\u0b83\u00DE") // "AஃÞ"
+    // Unencoded bytes
+    IO.print("\x48\x69\x2e") // "Hi."
+  }
+  ranges {
+    3..8  // inclusive
+    4...6 // half-inclusive
+  }
+  nothing { null }
+
+  lists {
+    var list = [1, "banana", true]
+    list[0] = 5
+    list[1..2]
+  }
+  maps {
+    var stringMap = {
+      "George": "Harrison",
+      "John": "Lennon",
+      "Paul": "McCartney",
+      "Ringo": "Starr"
+    }
+    var a = 1
+    var weirdMap = {
+      true: 1,
+      false: 0,
+      null: -1,
+      "str": "abc",
+      (1..5): 10,
+      a: 2,
+      _a: 3,
+      __a: 4
+    }
+  }
+}