filters

scope.js

@@ -0,0 +1,37 @@
+const _ = require('lodash');
+const lexical = require('./lexical.js');
+
+var scope = {
+    get: function(str) {
+        str = str && str.trim();
+        if(!str) return '';
+
+        if (lexical.isLiteral(str)) {
+            var a = lexical.parseLiteral(str);
+            return lexical.parseLiteral(str);
+        }
+        if (lexical.isVariable(str)) {
+            for (var i = this.scopes.length - 1; i >= 0; i--) {
+                var v = _.get(this.scopes[i], str);
+                if (v !== undefined) return v;
+            }
+        }
+        return '';
+    },
+    set: function(k, v){
+        this.scopes[this.scopes.length-1][k] = v;
+        return this;
+    },
+    push: function(ctx) {
+        return this.scopes.push(ctx);
+    },
+    pop: function() {
+        return this.scopes.pop();
+    }
+};
+
+exports.factory = function(_ctx) {
+    var ctx = Object.create(scope);
+    ctx.scopes = [_ctx];
+    return ctx;
+};