feat: implement first version of virtual addon

Author: streamich

addon/virtual.js

@@ -0,0 +1,93 @@
+'use strict';
+
+var createMemoizer = function (pfx) {
+    var offset = 10;
+    var msb = 35;
+    var power = 1;
+    var cache = {};
+
+    var self = {
+        length: 0,
+
+        next: function () {
+            var vcount = self.length + offset;
+
+            if (vcount === msb) {
+                offset += (msb + 1) * 9;
+                msb = Math.pow(36, ++power) - 1;
+            }
+            self.length++;
+
+            return vcount;
+        },
+
+        get: function () {
+            var curr = cache;
+            var lastIndex = arguments.length - 1;
+            var lastStep = arguments[lastIndex];
+
+            for (var i = 0; i < lastIndex; i++) {
+                var step = arguments[i] || '_';
+
+                if (!curr[step]) curr[step] = {};
+                curr = curr[step];
+            }
+
+            if (!curr[lastStep]) curr[lastStep] = pfx + self.next().toString(36);
+
+            return curr[lastStep];
+        },
+    };
+
+    return self;
+};
+
+exports.addon = function (renderer) {
+    if (process.env.NODE_ENV !== 'production') {
+        require('./__dev__/warnOnMissingDependencies')('styled', renderer, ['putRaw']);
+    }
+
+    var memo = createMemoizer(renderer.pfx);
+
+    renderer.atomic = function (selectorTemplate, rawDecl, atrule) {
+        var memoLength = memo.length;
+        var className = memo.get(atrule, selectorTemplate, rawDecl);
+
+        if (memoLength < memo.length) {
+            var selector = selectorTemplate.replace(/&/g, '.' + className);
+            var str = selector + '{' + rawDecl + '}';
+
+            if (atrule) {
+                str = atrule + '{' + str + '}';
+            }
+
+            renderer.putRaw(str);
+        }
+
+        return className;
+    };
+
+    renderer.virtual = function (selectorTemplate, decls, atrule) {
+        selectorTemplate = selectorTemplate || '&';
+
+        var classNames = '';
+
+        for (var prop in decls) {
+            var value = decls[prop];
+
+            if ((value instanceof Object) && !(value instanceof Array)) {
+                if (prop[0] === '@') {
+                    renderer.putAt(selectorTemplate, value, prop);
+                } else {
+                    renderer.virtual(renderer.selector(selectorTemplate, prop), value, atrule);
+                }
+            } else {
+                var rawDecl = renderer.decl(prop, value);
+
+                classNames += ' ' + renderer.atomic(selectorTemplate, rawDecl, atrule);
+            }
+        }
+
+        return classNames;
+    };
+};