From 4d06c3c4fa2031c26dcaba34c9c4f2e8babf9abd Mon Sep 17 00:00:00 2001
From: Owen Buckley <owenbuckley13@gmail.com>
Date: Wed, 4 Jan 2023 16:53:51 -0500
Subject: [PATCH] implementing fine grained observability

---
 src/jsx-loader.js | 51 ++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 48 insertions(+), 3 deletions(-)

diff --git a/src/jsx-loader.js b/src/jsx-loader.js
index bef481b..62e324f 100644
--- a/src/jsx-loader.js
+++ b/src/jsx-loader.js
@@ -116,7 +116,8 @@ function parseJsxElement(element, moduleContents = '') {
               if (left.object.type === 'ThisExpression') {
                 if (left.property.type === 'Identifier') {
                   // very naive (fine grained?) reactivity
-                  string += ` ${name}="__this__.${left.property.name}${expression.operator}${right.raw}; __this__.render();"`;
+                  // string += ` ${name}="__this__.${left.property.name}${expression.operator}${right.raw}; __this__.update(\\'${left.property.name}\\', null, __this__.${left.property.name});"`;
+                  string += ` ${name}="__this__.${left.property.name}${expression.operator}${right.raw}; __this__.setAttribute(\\'${left.property.name}\\', __this__.${left.property.name});"`;
                 }
               }
             }
@@ -144,6 +145,9 @@ function parseJsxElement(element, moduleContents = '') {
                   }
                 }
               }
+
+              // TODO make sure this only applies to `this` references!
+              string += ` data-wcc-${expression.name}="${name}" data-wcc-ins="attr"`;
             }
           } else {
             // xxx >
@@ -170,6 +174,11 @@ function parseJsxElement(element, moduleContents = '') {
 
       if (type === 'Identifier') {
         // You have {count} TODOs left to complete
+        const { name } = element.expression;
+
+        string = `${string.slice(0, string.lastIndexOf('>'))} data-wcc-${name}="\${this.${name}}" data-wcc-ins="text">`;
+        // TODO be able to remove this extra data attribute 
+        // string = `${string.slice(0, string.lastIndexOf('>'))} data-wcc-${name} data-wcc-ins="text">`;
         string += `\$\{${element.expression.name}\}`;
       } else if (type === 'MemberExpression') {
         const { object } = element.expression.object;
@@ -266,6 +275,8 @@ export function parseJsx(moduleURL) {
                   applyDomDepthSubstitutions(elementTree, undefined, hasShadowRoot);
 
                   const finalHtml = serialize(elementTree);
+                  console.debug({ finalHtml });
+                  console.debug(`${finalHtml.replace(/\n/g, '')};`);
                   const transformed = acorn.parse(`${elementRoot}.innerHTML = \`${finalHtml}\`;`, {
                     ecmaVersion: 'latest',
                     sourceType: 'module'
@@ -322,6 +333,9 @@ export function parseJsx(moduleURL) {
       }
 
       attributeChangedCallback(name, oldValue, newValue) {
+        console.debug('???attributeChangedCallback', { name });
+        console.debug('???attributeChangedCallback', { oldValue });
+        console.debug('???attributeChangedCallback', { newValue });
         function getValue(value) {
           return value.charAt(0) === '{' || value.charAt(0) === '['
             ? JSON.parse(value)
@@ -341,11 +355,42 @@ export function parseJsx(moduleURL) {
               `;
             }).join('\n')}
           }
-
-          this.render();
+          this.update(name, oldValue, newValue);
         }
       }
 
+      update(name, oldValue, newValue) {
+        console.debug('Update tracking against....', this.constructor.observedAttributes);
+        console.debug('Updating', name);
+        console.debug('Swap old', oldValue);
+        console.debug('For new', newValue);
+        console.debug('this[name]', this[name]);
+        const attr = \`data-wcc-\${name}\`;
+        const selector = \`[\${attr}]\`;
+        console.debug({ attr });
+        console.debug({ selector });
+
+        this.querySelectorAll(selector).forEach((el) => {
+          const needle = oldValue || el.getAttribute(attr);
+          console.debug({ el })
+          console.debug({ needle });
+          console.debug({ newValue });
+          switch(el.getAttribute('data-wcc-ins')) {
+            case 'text':
+              el.textContent = el.textContent.replace(needle, newValue);
+              break;
+            case 'attr':
+              console.debug(el.hasAttribute(attr))
+              if (el.hasAttribute(el.getAttribute(attr))) {
+                el.setAttribute(el.getAttribute(attr), newValue);
+              }
+              break;
+          }
+        })
+
+        console.debug('****************************');
+      }
+
       ${newModuleContents.slice(insertPoint)}
     `;
     /* eslint-enable indent */