+ object.value 支持路径取值

package.json

@@ -1,6 +1,6 @@
 {
   "name": "blear.utils.object",
-  "version": "1.0.5",
+  "version": "1.0.6",
   "description": "object utils",
   "scripts": {
     "live": "browser-sync start --config bs-config.js",

src/index.js

@@ -277,4 +277,74 @@ var supply = exports.supply = function supply(_deep, _source, _target) {
     }
 
     return source;
-};
+};
+
+
+/**
+ * 根据路径取值
+ * @param {Object} obj 对象
+ * @param {String|Array} path 路径
+ * @returns {*}
+ *
+ * @example
+ * object.value({a: 1}, 'a') === 1
+ * object.value({a: {b : 2}}, 'a.b') === 2
+ * object.value({a: {b : 2}}, ['a', 'b']) === 2
+ */
+exports.value = function (obj, path) {
+    var paths = [];
+
+    if (typeis.Array(path)) {
+        paths = path;
+    } else {
+        var point = '.';
+        var bracketStart = '[';
+        var bracketEnd = ']';
+        var start = 0;
+        var length = path.length;
+        var lastPath = '';
+        var push = function () {
+            if (lastPath) {
+                paths.push(lastPath);
+            }
+
+            lastPath = '';
+        };
+
+        while (start !== length) {
+            var char = path[start];
+
+            if (char === point) {
+                push();
+            } else if (char === bracketStart) {
+                push();
+            } else if (char === bracketEnd) {
+                //
+            } else {
+                lastPath += char;
+            }
+
+            start++;
+        }
+
+        push();
+    }
+
+    var i = 0;
+    var j = paths.length;
+    var ret;
+    var parent = obj;
+
+    for (; i < j; i++) {
+        var key = paths[i];
+
+        if (key in parent) {
+            ret = parent = parent[key];
+        } else {
+            ret = undefined;
+            break;
+        }
+    }
+
+    return ret;
+};

test/test.index.js

@@ -315,4 +315,27 @@ describe('index.js', function () {
         expect(o3.b[0]).toBe(1);
         expect(o3.b[1]).toBe(3);
     });
+
+    it('.value', function () {
+        var o1 = {
+            a: {
+                b: {
+                    1: {
+                        eee: 2
+                    }
+                },
+                c: [{d: 2}]
+            }
+        };
+
+        expect(object.value(o1, 'a.b[1].eee')).toEqual(2);
+        expect(object.value(o1, 'a.b[1].eeee')).toEqual(undefined);
+        expect(object.value(o1, 'a.b[2].eee')).toEqual(undefined);
+        expect(object.value(o1, 'a.b[1]')).toEqual(o1.a.b[1]);
+        expect(object.value(o1, ['a', 'b', '1'])).toEqual(o1.a.b[1]);
+        expect(object.value(o1, ['a', 'b', '1', 'eee'])).toEqual(2);
+        expect(object.value(o1, ['a', 'b', '1', 'eeee'])).toEqual(undefined);
+        expect(object.value(o1, 'a.c[0]')).toEqual(o1.a.c[0]);
+        expect(object.value(o1, 'a.c[0].d')).toEqual(2);
+    });
 });