tag:include

src/scope.js

@@ -0,0 +1,30 @@
+const _ = require('lodash');
+const lexical = require('./lexical.js');
+const error = require('./error.js');
+
+var scope = {
+    get: function(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) {
+        _.set(this.scopes[this.scopes.length - 1], k, v);
+        return this;
+    },
+    push: function(ctx) {
+        if (!ctx) error(`trying to push ${ctx} into scopes`);
+        return this.scopes.push(ctx);
+    },
+    pop: function() {
+        return this.scopes.pop();
+    }
+};
+
+exports.factory = function(_ctx) {
+    var ctx = Object.create(scope);
+    ctx.scopes = _ctx ? [_ctx] : [];
+    return ctx;
+};