add css class name helper functions for blocks

web/app/themes/badegg/resources/js/lib/blocks/classNames.js

@@ -0,0 +1,39 @@
+export function containerClassNames(attributes, bgProps)
+{
+
+  let classNames = [
+    'container',
+  ];
+
+  if('container_width' in attributes)
+    classNames.push(`container-${attributes.container_width}`);
+
+  if('alignment' in attributes)
+    classNames.push(`align-${attributes.alignment}`);
+
+  return classNames;
+}
+
+export function sectionClassNames(attributes, defaultClasses, extraClasses = [])
+{
+  defaultClasses = defaultClasses.split(' ');
+
+  let classNames = [
+    'section',
+  ];
+
+  if('padding_top'in attributes && !attributes.padding_top)
+    classNames.push('section-zero-top');
+
+  if('padding_bottom'in attributes && !attributes.padding_bottom)
+    classNames.push('section-zero-bottom');
+
+
+  // combine arrays
+  classNames = classNames.concat(defaultClasses).concat(extraClasses);
+
+  // remove duplicate items
+  classNames = [ ...new Set(classNames) ];
+
+  return classNames;
+}