better dep parsing

TODO.md

@@ -1,9 +1,5 @@
-- complete arrayWatcher
-
 - computed properties (through invoking functions, need to rework the setter triggering mechanism using emitter)
 
-- the data object passed in should become an absolute source of truth, so multiple controllers can bind to the same data (i.e. second seed using it should insert dependency instead of overwriting it)
-
 - nested properties in scope (kinda hard but try)
 
 - parse textNodes

examples/todos.html

@@ -62,7 +62,7 @@
                 { text: 'parse textnodes', done: false }
             ]
 
-            Seed.controller('Todos', function (scope, seed) {
+            Seed.controller('Todos', function (scope) {
 
                 // regular properties
                 scope.todos = todos
@@ -82,13 +82,10 @@
 
                 // event handlers
                 scope.addTodo = function (e) {
-                    var text = e.el.value
-                    if (text) {
+                    var val = e.el.value
+                    if (val) {
                         e.el.value = ''
-                        scope.todos.push({
-                            text: text,
-                            done: false
-                        })
+                        scope.todos.unshift({ text: val, done: false })
                         scope.remaining++
                     }
                 }

src/directive-parser.js

@@ -8,6 +8,46 @@ var KEY_RE          = /^[^\|<]+/,
     FILTER_TOKEN_RE = /[^\s']+|'[^']+'/g,
     DEPS_RE         = /<[^<\|]+/g
 
+// parse a key, extract argument and nesting/root info
+function parseKey (rawKey) {
+
+    var res = {},
+        argMatch = rawKey.match(ARG_RE)
+
+    res.key = argMatch
+        ? argMatch[2].trim()
+        : rawKey.trim()
+
+    res.arg = argMatch
+        ? argMatch[1].trim()
+        : null
+
+    var nesting = res.key.match(/^\^+/)
+    res.nesting = nesting
+        ? nesting[0].length
+        : false
+
+    res.root = res.key.charAt(0) === '$'
+    return res
+}
+
+function parseFilter (filter) {
+
+    var tokens = filter.slice(1)
+        .match(FILTER_TOKEN_RE)
+        .map(function (token) {
+            return token.replace(/'/g, '').trim()
+        })
+
+    return {
+        name  : tokens[0],
+        apply : filters[tokens[0]],
+        args  : tokens.length > 1
+                ? tokens.slice(1)
+                : null
+    }
+}
+
 function Directive (directiveName, expression) {
 
     var directive = directives[directiveName]
@@ -26,41 +66,22 @@ function Directive (directiveName, expression) {
     this.directiveName = directiveName
     this.expression = expression
 
-    var rawKey   = expression.match(KEY_RE)[0], // guarded in parse
-        argMatch = rawKey.match(ARG_RE)
-
-    this.key = argMatch
-        ? argMatch[2].trim()
-        : rawKey.trim()
+    var rawKey   = expression.match(KEY_RE)[0],
+        keyInfo  = parseKey(rawKey)
 
-    this.arg = argMatch
-        ? argMatch[1].trim()
-        : null
+    for (var prop in keyInfo) {
+        this[prop] = keyInfo[prop]
+    }
     
     var filterExps = expression.match(FILTERS_RE)
-    if (filterExps) {
-        this.filters = filterExps.map(function (filter) {
-            var tokens = filter.slice(1)
-                .match(FILTER_TOKEN_RE)
-                .map(function (token) {
-                    return token.replace(/'/g, '').trim()
-                })
-            return {
-                name  : tokens[0],
-                apply : filters[tokens[0]],
-                args  : tokens.length > 1
-                        ? tokens.slice(1)
-                        : null
-            }
-        })
-    } else {
-        this.filters = null
-    }
+    this.filters = filterExps
+        ? filterExps.map(parseFilter)
+        : null
 
     var depExp = expression.match(DEPS_RE)
-    if (depExp) {
-        this.deps = depExp[0].slice(1).trim().split(/\s+/)
-    }
+    this.deps = depExp
+        ? depExp[0].slice(1).trim().split(/\s+/).map(parseKey)
+        : null
 }
 
 Directive.prototype.update = function (value) {

src/seed.js

@@ -25,17 +25,19 @@ function Seed (el, options) {
 
     // initialize the scope object
     var dataPrefix = config.prefix + '-data'
-    this.scope =
+    var scope = this.scope =
             (options && options.data)
             || config.datum[el.getAttribute(dataPrefix)]
             || {}
     el.removeAttribute(dataPrefix)
 
-    this.scope.$seed    = this
-    this.scope.$destroy = this._destroy.bind(this)
-    this.scope.$dump    = this._dump.bind(this)
-    this.scope.$index   = options.index
-    this.scope.$parent  = options.parentSeed && options.parentSeed.scope
+    scope.$seed     = this
+    scope.$destroy  = this._destroy.bind(this)
+    scope.$dump     = this._dump.bind(this)
+    scope.$on       = this.on.bind(this)
+    scope.$emit     = this.emit.bind(this)
+    scope.$index    = options.index
+    scope.$parent   = options.parentSeed && options.parentSeed.scope
 
     // revursively process nodes for directives
     this._compileNode(el, true)
@@ -46,7 +48,7 @@ function Seed (el, options) {
         el.removeAttribute(ctrlAttr)
         var controller = config.controllers[ctrlID]
         if (controller) {
-            controller.call(this, this.scope, this)
+            controller.call(this, this.scope)
         } else {
             console.warn('controller ' + ctrlID + ' is not defined.')
         }
@@ -151,6 +153,13 @@ Seed.prototype._bind = function (node, directive) {
 
     directive.key = key
 
+    // computed properties
+    if (directive.deps) {
+        directive.deps.forEach(function (dep) {
+            console.log(dep)
+        })
+    }
+
     var binding = scopeOwner._bindings[key] || scopeOwner._createBinding(key)
 
     // add directive to this binding