添加面向对象部分

CHANGELOG.md

@@ -2,7 +2,9 @@
 **仅包含语言LK的变化**
 
 ## 0.1.3
-
+- 添加`prefixexp : Name args`的语法
+- 支持面向对象
+- `REPL`支持自动添加`print`
 
 ## 0.1.2
 - `Table`索引从`0`开始

LANG.md

@@ -268,6 +268,35 @@ shy add = fn (a, b) {
 ```
 除去常规的函数声明，`LK` 还可以将函数赋值给变量，这样可以实现匿名函数。
 
+## 面向对象
+```js
+// 定义一个对象Rect
+Rect = {}
+
+// 定义一个函数，可以用来构造Rect
+fn Rect:new() {
+    o = {}
+    for k, v in Rect {
+      o[k] = v
+    }
+    rt o
+}
+
+// 给Rect对象添加一个函数，可以用来打印Rect的信息
+fn Rect:printArea() {
+    print("Rect area: ", self.width * self.height)
+}
+
+fn Rect:set(width, height) {
+    self.width = width
+    self.height = height
+}
+
+shy rect = Rect:new()
+rect:set(10, 20)
+rect:printArea()  // Rect area: 200
+```
+
 
 ## 包
 ```js

test/basic.lk

@@ -1,4 +1,5 @@
 import "test/import"
+import "test/object"
 
 shy func = fn (e) {print(e)}
 func(1!=2 and 3!=3)
@@ -19,4 +20,11 @@ if #long >= 0 and '' {
 
 print(6 ~/ 2, 6 & 2, 6 / 2)
 print({'a'} .. '', 1 .. 2, _VERSION, math.pi)
-print(str({5, 'd': false}))
+print(str({5, 'd': false}))
+
+shy square = Rect:square(10)
+shy rect = Rect:new()
+rect:set(10, 20)
+
+square:printArea()
+rect:printArea()

test/object.lk

@@ -1,18 +1,25 @@
-Rectangle = {'area': 0, 'length': 0, 'breadth': 0}
+Rect = {'width': 0, 'height': 0}
 
-fn Rectangle:new(o,length,breadth) {
-  o = o or {}
-  setmetatable(o, self)
-  self.__index = self
-  self.length = length or 0
-  self.breadth = breadth or 0
-  self.area = length*breadth;
-  rt o
+fn Rect:new() {
+    o = {}
+    for k, v in Rect {
+      o[k] = v
+    }
+    rt o
 }
 
-fn Rectangle:printArea() {
-    print("矩形面积为 ", self.area)
+fn Rect:square(len) {
+    o = self:new()
+    o.width = len
+    o.height = len
+    rt o
 }
 
-shy rect = Rectangle:new(nil, 10, 20)
-rect:printArea()
+fn Rect:printArea() {
+    print("Rect area: ", self.width * self.height)
+}
+
+fn Rect:set(width, height) {
+    self.width = width
+    self.height = height
+}