Updated a few more things

lib/css/index.js

@@ -0,0 +1,70 @@
+// -------------------------------------------------------------
+// WARNING: this file is used by both the client and the server.
+// Do not use any browser or node-specific API!
+// -------------------------------------------------------------
+const csstree = require('css-tree');
+const rawMap = [
+    require('./import'),
+    require('./url-string'),
+    require('./url-raw'),
+];
+
+class CSSRewriter {
+    constructor(ctx) {
+        this.ctx = ctx;
+        this.map = new Map();
+        rawMap.forEach(({ type, ...keys }) => {
+            if (!this.map.has(type)) this.map.set(type, []);
+            this.map.get(type).push(keys);
+        });
+    };
+    process(source, config = {}) {
+        try {
+            const ast = csstree.parse(source, { 
+                context: config.context || 'stylesheet',
+                parseCustomProperty: true, 
+            });
+            csstree.walk(ast, node => {
+                if (this.map.has(node.type)) {
+                    const data = {
+                        ctx: this.ctx,
+                        meta: config.meta || {},
+                    }
+                    const transformers = this.map.get(node.type);
+                    for (const transformer of transformers) {
+                        if (!transformer.condition || transformer.condition(node, data)) {
+                            if (transformer.rewrite) transformer.rewrite(node, data);
+                        };  
+                    };
+                };
+            });
+            return csstree.generate(ast);
+        } catch(e) {
+            return source;
+        };
+    };
+    source(processed, config = {}) {
+        const ast = csstree.parse(processed, { 
+            context: config.context || 'stylesheet',
+            parseCustomProperty: true, 
+        });
+        csstree.walk(ast, node => {
+            if (this.map.has(node.type)) {
+                const data = {
+                    ctx: this.ctx,
+                    meta: config.meta || {},
+                }
+                const transformers = this.map.get(node.type);
+                for (const transformer of transformers) {
+                    if (!transformer.condition || transformer.condition(node, data)) {
+                        console.log(transformer)
+                        if (transformer.source) transformer.source(node, data);
+                    };  
+                };
+            };
+        });
+        return csstree.generate(ast);
+    };  
+};
+
+module.exports = CSSRewriter;