render, filter, tag

render.js

@@ -0,0 +1,46 @@
+const Filter = require('./filter');
+const Tag = require('./tag');
+
+module.exports = function render(tokens, ctx) {
+    var html = '';
+    for (var i = 0; i < tokens.length; i++) {
+        var token = tokens.shift();
+        switch (token.type) {
+            case 'html':
+                html += token.value;
+                break;
+            case 'output':
+                html += renderOutput(token);
+                break;
+            case 'tag':
+                html += renderTag(token);
+                break;
+            default:
+                throw new Error(`unexpected type: ${token.type}`);
+        }
+    }
+    return html;
+
+    function renderOutput(token) {
+        var filters = token.value.split('|');
+        var val = ctx.get(filters.shift());
+        return filters
+            .map(str => Filter.parse(str))
+            .reduce((v, filter) => filter.render(v, ctx), val);
+    }
+
+    function renderTag(token) {
+        var tag = Tag.parse(token.value), subTokens = [];
+        if(tag.needClose){
+            var curToken, endToken = 'end' + tag.name;
+            while((curToken = tokens.shift()).value !== endToken){
+                subTokens.push(curToken);
+            }
+            if(curToken.value !== endToken){
+                throw new Error(`${token.value} not closed`);
+            }
+        }
+        return tag.render(subTokens, ctx);
+    }
+};
+