tag:include

src/render.js

@@ -0,0 +1,66 @@
+const error = require('./error.js');
+const Exp = require('./expression.js');
+const assert = require('assert');
+
+var render = {
+
+    renderTemplates: function(templates, scope) {
+        assert(scope, 'unable to evalTemplates: scope undefined');
+        var html = '',
+            partial;
+        templates.some(template => {
+            if (scope.get('forloop.skip')) return true;
+            switch (template.type) {
+                case 'tag':
+                    partial = this.renderTag(template, scope, this.register);
+                    if (partial === undefined) return true;
+                    html += partial;
+                    break;
+                case 'html':
+                    html += template.value;
+                    break;
+                case 'output':
+                    var val = this.evalOutput(template, scope);
+                    html += stringify(val);
+            }
+        });
+        return html;
+    },
+
+    renderTag: function(template, scope, register) {
+        if (template.name === 'continue') {
+            scope.set('forloop.skip', true);
+            return;
+        }
+        if (template.name === 'break') {
+            scope.set('forloop.stop', true);
+            scope.set('forloop.skip', true);
+            return;
+        }
+        return template.render(scope, register);
+    },
+
+    evalOutput: function(template, scope) {
+        assert(scope, 'unable to evalOutput: scope undefined');
+        var val = Exp.evalExp(template.initial, scope);
+        return template.filters
+            .reduce((v, filter) => filter.render(v, scope), val);
+    },
+
+    resetRegisters: function(){
+        return this.register = {};
+    }
+};
+
+function factory() {
+    var instance = Object.create(render);
+    instance.register = {};
+    return instance;
+}
+
+function stringify(val) {
+    if (typeof val === 'string') return val;
+    return JSON.stringify(val);
+}
+
+module.exports = factory;