Added jsx-source plugin

packages/babel-plugin-transform-react-jsx-source/src/index.js

@@ -0,0 +1,56 @@
+
+ /**
+ * This adds {fileName, lineNumber} annotations to React component definitions
+ * and to jsx tag literals.
+ *
+ *
+ * == JSX Literals ==
+ *
+ * <sometag />
+ *
+ * becomes:
+ *
+ * <sometag __source={{fileName: 'this/file.js', lineNumber: 10}}/>
+ */
+
+
+import path from "path";
+
+const TRACE_ID = "__source";
+
+export default function ({ types: t }) {
+  function objectToAst(object) {
+    const properties = Object.keys(object).map((attr) => {
+      let value;
+      switch(typeof object[attr]) {
+        case "number": value = t.numericLiteral(object[attr]); break;
+        default: value = t.stringLiteral(object[attr].toString());
+      }
+      return t.objectProperty(t.identifier(attr), value);
+    });
+    return t.objectExpression(properties);
+  }
+
+  function makeTrace(fileName, lineNumber) {
+    return objectToAst({
+      fileName,
+      lineNumber,
+    });
+  }
+
+  let visitor = {
+    JSXOpeningElement(node, state) {
+      const id = t.jSXIdentifier(TRACE_ID);
+      const fileName = state.file.log.filename !== "unknown" 
+        ? path.relative(__dirname, state.file.log.filename) 
+        : null;
+      const trace = makeTrace(fileName, node.container.openingElement.loc.start.line);
+
+      node.container.openingElement.attributes.push(t.jSXAttribute(id, t.jSXExpressionContainer(trace)));
+    }
+  };
+
+  return {
+    visitor
+  };
+}