first step of TSpan

lib/extract/extractTextContent.js

@@ -0,0 +1,26 @@
+import React, {
+    Children
+} from 'react';
+
+import TSpan from '../../elements/TSpan';
+const newLine = /\n/g;
+
+export default function(children) {
+    let spans = [];
+
+    Children.forEach(children, function (child = '') {
+        let span;
+        if (typeof child === 'string') {
+            span = <TSpan>{child.replace(newLine, ' ')}</TSpan>;
+        } else if (child.type === TSpan) {
+            span = child;
+        } else {
+            // give warning about the illegal child type
+            return;
+        }
+
+        spans.push(span);
+    });
+
+    return spans;
+}