User:Proteins/unindent.js

//<pre>
// Unindent discussions for accessibility
// WARNING WARNING WARNING ----- DO NOT USE THIS SCRIPT
// OBSOLETE AND BUGGY ----- DO NOT USE THIS SCRIPT
// NOT DELETED ONLY BECAUSE I WANT TO REMEMBER SOME CODING IDEAS AND PITFALLS IN JAVASCRIPT
 
function unindent() {
	var alert_string = "";
	var diagnostic_string = "";

	var indent_level = 0;
	var indent_level_string = "";
	var prev_indent_level_string = "";

	var prepended_string = "";
	var empty_prepended_string = "           ";

	var DL_elements;
	var num_DL_elements = 0;

	var DT_elements;
	var num_DT_elements = 0;

	var DD_elements;
	var temp_DD_element;
	var num_DD_elements = 0;
	var DD_element_index = 0;

	var num_unindented_DD_elements = 0;
	var num_higher_level_DD_elements = 0;

	var top_node;
	var child_node;
	var parent_node;
	var top_DD_node;

	var top_DL_node;
	var prev_top_DL_node;

	var temp_DD_text;
	var untagged_text;
	var unspaced_text;

	var byte_count = 0;
	var num_child_nodes = 0;
	var num_sub_DL_elements = 0;

	var sibling_node;
	var sibling_node_list = new Array();

	// Colors to help sighted people after the unindenting
	var num_colors = 0;
	var DD_background_colors = ["white", "yellow", "greenyellow", "gold", "lightskyblue", "orange", "lawngreen", "darkorange"];


// Initialization
	num_colors = DD_background_colors.length;

	top_node = document.getElementById('bodyContent');
	DD_elements = top_node.getElementsByTagName("DD");
	num_DD_elements = DD_elements.length;

// First-pass loop colors the links and adds the level to the beginning
	diagnostic_string = "";
	num_unindented_DD_elements = 0;
	num_higher_level_DD_elements = 0;

	top_DL_node = null;
	prev_top_DL_node = null;

	prepended_string = "";
	indent_level_string = "";
	prev_indent_level_string = "";

	for (DD_element_index=0; DD_element_index<num_DD_elements; DD_element_index++) { 
		temp_DD_element = DD_elements[DD_element_index];

		child_node = temp_DD_element.firstChild;
		if (child_node) {
			if ((child_node.nodeType == 3) && (child_node.data.match(/^\(Indent\s\d+\)/))) { 
				continue;
			} // add "(Indent #)" to beginning if it isn't there already
		}

		num_sub_DL_elements = temp_DD_element.getElementsByTagName("DL").length;

		// Skip empty DD elements
		num_child_nodes = temp_DD_element.childNodes.length;
		if (!num_child_nodes) { continue; } // ignore empty DD elements

//Alternative approach: skip all DD elements that have a sub DL element within
		temp_DD_text = temp_DD_element.innerHTML;
		unspaced_text = temp_DD_text.replace(/\s/ig, ""); // remove whitespaces
		untagged_text = unspaced_text.replace(/<dl>.*<\/dl>/ig, ""); // remove inner DL's
		untagged_text = untagged_text.replace(/(<([^>]+)>)/ig,""); // remove other HTML tags

		byte_count = untagged_text.length; // count characters
		if (byte_count < 1) { continue; }


		// Find the topmost DL element for this DD node
		indent_level = 0;
		top_DL_node = null;
		top_DD_node = temp_DD_element;
		parent_node = temp_DD_element.parentNode;

		while ((parent_node) && (parent_node != top_node)) {
			if (parent_node.nodeType != 1) {
				parent_node = parent_node.parentNode;
				continue; 
			} // examine only Element nodes

			if (parent_node.nodeName == "DL") { 
				// Check whether the parent DL element has any DT elements
				num_DT_elements = parent_node.getElementsByTagName("DT").length;
				if (num_DT_elements > 0) { break; } // if so, stop unindenting...

				// ...else make this the new indent level
				indent_level++;
				top_DL_node = parent_node;
			} // closes check for a parental DL element

			if (parent_node.nodeName == "DD") { top_DD_node = parent_node; }

			parent_node = parent_node.parentNode;
		} // closes loop climbing up the document tree

		if (top_DL_node != prev_top_DL_node) { 
			prev_indent_level_string = "";
		}
		prev_top_DL_node = top_DL_node;

		if (indent_level > 2) { num_higher_level_DD_elements++; }

		if (indent_level > 0) { 
			num_unindented_DD_elements++;
			temp_DD_element.style.cssText = "background-color:" + DD_background_colors[indent_level%num_colors];

			indent_level_string = "(Indent " + indent_level + ") ";

//			indent_level_string = "(Indent " + indent_level + " " + num_sub_DL_elements + ") ";
//			if (num_sub_DL_elements > 0) { 
//				indent_level_string += "[ " + num_sub_DL_elements + " " + byte_count + " " + untagged_text + " ] ";
//			}

			if (indent_level_string == prev_indent_level_string) { 
				prepended_string = empty_prepended_string;
			} else {
				prepended_string = indent_level_string;
			}
			prev_indent_level_string = indent_level_string;

			child_node = temp_DD_element.firstChild;
			if (child_node) {
				if ((child_node.nodeType != 3) || (!child_node.data.match(/^\(Indent\s\d+\)/))) { 
					temp_DD_element.insertBefore(document.createTextNode(prepended_string), child_node);
				} // add "(Indent #)" to beginning if it isn't there already
			} else {
				indent_level_string += "No text in this DD element.\n";
				temp_DD_element.appendChild(document.createTextNode(prepended_string));
			}
			temp_DD_element.normalize();

			sibling_node_list[DD_element_index] = null;
			if ((top_DD_node) && (top_DL_node)) {
				sibling_node = top_DD_node.nextSibling;
				while ((sibling_node) && (sibling_node.nodeType != 1)) { 
					sibling_node = sibling_node.nextSibling;
				}
			} // closes check that both top_DD_node and top_DL_node are defined

			if (sibling_node_list[DD_element_index]) {
				diagnostic_string += "DD element " + DD_element_index + " is indented to level " + indent_level + ".\n";
			} else { 
				diagnostic_string += "DD element " + DD_element_index + " is indented to level " + indent_level + ".  NULL SIBLING\n";
			}
		} // check for unindenting
	} // closes loop over the DD elements of the document
//	window.alert(diagnostic_string);

// Prevents repeated applications of the script from changing the colors
	if (num_higher_level_DD_elements == 0) { return; }

// Second-pass loop changes the document tree structure
	diagnostic_string = "";
	for (DD_element_index=0; DD_element_index<num_DD_elements; DD_element_index++) { 
		temp_DD_element = DD_elements[DD_element_index];

		indent_level = 0;

		// Find the topmost DL element for this DD node
		top_DL_node = null;
		top_DD_node = null;
		parent_node = temp_DD_element.parentNode;

		while ((parent_node) && (parent_node != top_node)) {
			if (parent_node.nodeType != 1) {
				parent_node = parent_node.parentNode;
				continue; 
			} // examine only Element nodes

			if (parent_node.nodeName == "DL") { 
				// Check whether the parent DL element has any DT elements
				num_DT_elements = parent_node.getElementsByTagName("DT").length;
				if (num_DT_elements > 0) { break; } // if so, stop unindenting...

				// ...else make this the new indent level
				indent_level++;
				top_DL_node = parent_node;
			} // closes check for a parental DL element

			if (parent_node.nodeName == "DD") { top_DD_node = parent_node; }

			parent_node = parent_node.parentNode;
		} // closes loop climbing up the document tree

		if (indent_level > 1) { 
			if ((top_DD_node) && (top_DL_node)) {
//				top_DL_node.insertBefore(temp_DD_element, top_DD_element);

				sibling_node = sibling_node_list[DD_element_index];
				if (sibling_node) { 
					top_DL_node.insertBefore(temp_DD_element, sibling_code);
				} else { 
					top_DL_node.appendChild(temp_DD_element);
				}
			} // check that both the top_DD and top_DL elements are defined
		} // check for unindenting
	} // closes loop over the DD elements of the document
//	window.alert(diagnostic_string);

// Third-pass loop to uncreate empty discursive lists

//Acknowledgment
	alert_string = "Unindented " + num_unindented_DD_elements + " paragraphs of " + num_DD_elements + " possible.";
	window.alert(alert_string);

} // closes unindent() function

addOnloadHook(function () {
            mw.util.addPortletLink('p-cactions', 'javascript:unindent()', 'unindent', 'ca-unindent', 'Unindent discussions', 'i', '');
});
 
//</pre>