User:Proteins/quickdiffs.js

//

// Summarizes the differences between two page versions in pop-up windows
// Perhaps calculate fractional change in document?
//
// To use this script, add "importScript('User:Proteins/quickdiffs.js');" to your monobook.js subpage
// under your user page, as you can see at User:Proteins/monobook.js
function quickDiffs() {
var alert_string = "";
var num_alert_strings = 0;
var alert_string_index = 0;
var alert_string_list = new Array();
var body_content;
var article_tables;
var temp_article_table;
var num_article_tables = 0;
var article_table_index = 0;
var diff_table;
var num_diff_tables = 0;
var diff_table_body;
var diff_table_bodies;
var num_diff_table_bodies = 0;
var temp_table_row;
var diff_table_rows;
var table_row_index= 0;
var num_diff_table_rows = 0;
var table_row_data;
var temp_table_datum;
var table_datum_index = 0;
var num_table_row_data = 0;
var temp_table_datum_text = "";
var temp_table_datum_text_node;
var diff_old_version_info; //className = "diff-otitle"
var diff_new_version_info; //className = "diff-ntitle"
var mw_diff_otitle1;
var mw_diff_otitle1_child;
var mw_diff_otitle1_grandchild;
var mw_diff_otitle1_text = "";
var mw_diff_otitle2;
var mw_diff_otitle2_child;
var mw_diff_otitle2_grandchild;
var mw_diff_otitle2_text = "";
var mw_diff_otitle3;
var mw_diff_otitle3_child;
var mw_diff_otitle3_grandchild;
var mw_diff_otitle3_text = "";
var mw_diff_otitle4;
var mw_diff_otitle4_child;
var mw_diff_otitle4_grandchild;
var mw_diff_otitle4_text = "";
var mw_diff_ntitle1;
var mw_diff_ntitle1_child;
var mw_diff_ntitle1_grandchild;
var mw_diff_ntitle1_text = "";
var mw_diff_ntitle2;
var mw_diff_ntitle2_child;
var mw_diff_ntitle2_grandchild;
var mw_diff_ntitle2_text = "";
var mw_diff_ntitle3;
var mw_diff_ntitle3_child;
var mw_diff_ntitle3_grandchild;
var mw_diff_ntitle3_text = "";
var mw_diff_ntitle4;
var mw_diff_ntitle4_child;
var mw_diff_ntitle4_grandchild;
var mw_diff_ntitle4_text = "";
var revisions = "";
var num_revisions = 0;
var num_line_numbers = 0;
var current_old_line_number = 0;
var current_new_line_number = 0;
var old_line_numbers = new Array();
var new_line_numbers = new Array();
var line_number_flag = 0;
var num_diff_addedlines = 0;
var num_diff_deletedlines = 0;
var num_diff_context_lines = 0;
var num_diff_undefined_lines = 0;
var num_changes = 0;
var num_additions = 0;
var num_deletions = 0;
var num_replacements = 0;
var span_index = 0;
var num_potential_spans = 0;
var temp_added_span;
var added_span_nodes;
var num_added_spans = 0;
var added_span_text = "";
var temp_added_line = "";
var prev_added_line = "";
var temp_added_span_text = "";
var temp_deleted_span;
var deleted_span_nodes;
var num_deleted_spans = 0;
var deleted_span_text = "";
var temp_deleted_line = "";
var prev_deleted_line = "";
var temp_deleted_span_text = "";
var num_changed_lines = 0;
var diff_added_lines = new Array();
var diff_deleted_lines = new Array();
var num_changes_in_line = new Array();
var diff_changes = new Array();
var diff_change_line_numbers = new Array();
// Check that there is exactly one table on this page with the className "diff"
body_content = document.getElementById('bodyContent');
if (!body_content) {
alert_string = "ERROR: This article has no bodyContent element.";
window.alert(alert_string);
return;
}
article_tables = body_content.getElementsByTagName("TABLE");
if (!article_tables) {
alert_string = "ERROR: This article has no TABLE elements.";
window.alert(alert_string);
return;
}
num_article_tables = article_tables.length;
if (!num_article_tables) {
alert_string = "ERROR: This article has no TABLE elements.";
window.alert(alert_string);
return;
}
num_diff_tables = 0;
for (article_table_index=0; article_table_index
temp_article_table = article_tables[article_table_index];
if (!temp_article_table) { continue; }
if (temp_article_table.className == "diff") {
num_diff_tables++;
diff_table = temp_article_table;
}
} // closes loop searching for the diff table
if (num_diff_tables == 0) {
alert_string = "ERROR: This article has no TABLE elements belonging to the \"diff\" class.";
window.alert(alert_string);
return;
} else if (num_diff_tables != 1) {
alert_string = "ERROR: This article has " + num_diff_tables + " TABLE elements belonging to the \"diff\" class.";
alert_string += "An article should have at most one \"diff\" table.\n";
window.alert(alert_string);
return;
}
// Check that there is exactly one table body
diff_table_bodies = diff_table.getElementsByTagName("TBODY");
if (!diff_table_bodies) {
alert_string = "ERROR: This article has no TBODY element within its \"diff\" table.";
window.alert(alert_string);
return;
}
num_diff_table_bodies = diff_table_bodies.length;
if (!num_diff_table_bodies) {
alert_string = "ERROR: This article has no TBODY element within its \"diff\" table.";
window.alert(alert_string);
return;
} else if (num_diff_table_bodies != 1) {
alert_string = "ERROR: This article has " + num_diff_table_bodies + " TBODY elements within its \"diff\" table.";
alert_string += "A \"diff\" table should have at most one TBODY element.\n";
window.alert(alert_string);
return;
}
diff_table_body = diff_table_bodies[0];
if (!diff_table_body) {
alert_string = "ERROR: This article has a null TBODY element within its \"diff\" table.";
window.alert(alert_string);
return;
}
// Loop over the table rows in the table body
diff_table_rows = diff_table_body.getElementsByTagName("TR");
if (!diff_table_rows) {
alert_string = "ERROR: This article has no TR elements within its \"diff\" table body.";
window.alert(alert_string);
return;
}
num_diff_table_rows = diff_table_rows.length;
if (!num_diff_table_rows) {
alert_string = "ERROR: This article has no TR elements within its \"diff\" table body.";
window.alert(alert_string);
return;
} else if (num_diff_table_rows == 1) {
alert_string = "This article has only one row (TR element) within its \"diff\" table body.";
alert_string += "This shouldn't happen under ordinary circumstances; however, it suggests that the two versions are identical\n";
window.alert(alert_string);
return;
}
// Get header texts for older version
mw_diff_otitle1_text = "";
mw_diff_otitle1 = document.getElementById('mw-diff-otitle1');
if (!mw_diff_otitle1) {
window.alert("ERROR: This article has no element with id \"mw-diff-otitle1\".\n\n");
} else {
mw_diff_otitle1_child = mw_diff_otitle1.firstChild;
if (!mw_diff_otitle1_child) {
window.alert("ERROR: The \"mw-diff-otitle1\" element has no child node.\n\n");
} else {
mw_diff_otitle1_grandchild = mw_diff_otitle1_child.firstChild;
if (!mw_diff_otitle1_grandchild) {
window.alert("ERROR: The \"mw-diff-otitle1\" element has no grandchild node.\n\n");
} else {
mw_diff_otitle1_text = mw_diff_otitle1_grandchild.innerHTML;
} // closes check for grandchild node
} // closes check for child node
} // closes check for mw_diff_otitle1 node
//	window.alert("The mw_diff_otitle1_text is " + mw_diff_otitle1_text + "\n");
mw_diff_otitle2_text = "";
mw_diff_otitle2 = document.getElementById('mw-diff-otitle2');
if (!mw_diff_otitle2) {
window.alert("ERROR: This article has no element with id \"mw-diff-otitle2\".\n\n");
} else {
mw_diff_otitle2_child = mw_diff_otitle2.firstChild;
if (!mw_diff_otitle2_child) {
window.alert("ERROR: The \"mw-diff-otitle2\" element has no child node.\n\n");
} else {
mw_diff_otitle2_text = mw_diff_otitle2_child.innerHTML;
} // closes check for child node
} // closes check for mw_diff_otitle2 node
//	window.alert("The mw_diff_otitle2_text is " + mw_diff_otitle2_text + "\n");
mw_diff_otitle3_text = "";
mw_diff_otitle3 = document.getElementById('mw-diff-otitle3');
if (!mw_diff_otitle3) {
window.alert("ERROR: This article has no element with id \"mw-diff-otitle3\".\n\n");
} else {
mw_diff_otitle3_text = mw_diff_otitle3.innerHTML;
mw_diff_otitle3_text = mw_diff_otitle3_text.replace(/>/ig, ">");
mw_diff_otitle3_text = mw_diff_otitle3_text.replace(/</ig, "<");
mw_diff_otitle3_text = mw_diff_otitle3_text.replace(/(<([^>]+)>)/ig,"");
} // closes check for mw_diff_otitle3 node
//	window.alert("The mw_diff_otitle3_text is " + mw_diff_otitle3_text + "\n");
// Possibly add code for mw_diff_otitle4 here, but seems unneeded
// Get header texts for newer version
mw_diff_ntitle1_text = "";
mw_diff_ntitle1 = document.getElementById('mw-diff-ntitle1');
if (!mw_diff_ntitle1) {
window.alert("ERROR: This article has no element with id \"mw-diff-ntitle1\".\n\n");
} else {
mw_diff_ntitle1_child = mw_diff_ntitle1.firstChild;
if (!mw_diff_ntitle1_child) {
window.alert("ERROR: The \"mw-diff-ntitle1\" element has no child node.\n\n");
} else {
mw_diff_ntitle1_grandchild = mw_diff_ntitle1_child.firstChild;
if (!mw_diff_ntitle1_grandchild) {
window.alert("ERROR: The \"mw-diff-ntitle1\" element has no grandchild node.\n\n");
} else {
mw_diff_ntitle1_text = mw_diff_ntitle1_grandchild.innerHTML;
} // closes check for grandchild node
} // closes check for child node
} // closes check for mw_diff_ntitle1 node
//	window.alert("The mw_diff_ntitle1_text is " + mw_diff_ntitle1_text + "\n");
mw_diff_ntitle2_text = "";
mw_diff_ntitle2 = document.getElementById('mw-diff-ntitle2');
if (!mw_diff_ntitle2) {
window.alert("ERROR: This article has no element with id \"mw-diff-ntitle2\".\n\n");
} else {
mw_diff_ntitle2_child = mw_diff_ntitle2.firstChild;
if (!mw_diff_ntitle2_child) {
window.alert("ERROR: The \"mw-diff-ntitle2\" element has no child node.\n\n");
} else {
mw_diff_ntitle2_text = mw_diff_ntitle2_child.innerHTML;
} // closes check for child node
} // closes check for mw_diff_ntitle2 node
//	window.alert("The mw_diff_ntitle2_text is " + mw_diff_ntitle2_text + "\n");
mw_diff_ntitle3_text = "";
mw_diff_ntitle3 = document.getElementById('mw-diff-ntitle3');
if (!mw_diff_ntitle3) {
window.alert("ERROR: This article has no element with id \"mw-diff-ntitle3\".\n\n");
} else {
mw_diff_ntitle3_text = mw_diff_ntitle3.innerHTML;
mw_diff_ntitle3_text = mw_diff_ntitle3_text.replace(/>/ig, ">");
mw_diff_ntitle3_text = mw_diff_ntitle3_text.replace(/</ig, "<");
mw_diff_ntitle3_text = mw_diff_ntitle3_text.replace(/(<([^>]+)>)/ig,"");
} // closes check for mw_diff_ntitle3 node
//	window.alert("The mw_diff_ntitle3_text is " + mw_diff_ntitle3_text + "\n");
// Possibly add code for mw_diff_ntitle4 here, but seems unneeded
// Loop over the rows in the difference table
num_alert_strings = 0;
alert_string_list[0] = "NONE";
num_revisions = 1;
revisions = "The newer version is separated from the older version by one revision.";
for (table_row_index=0; table_row_index
temp_table_row = diff_table_rows[table_row_index];
if (!temp_table_row) { continue; }
table_row_data = temp_table_row.getElementsByTagName("TD");
if (!table_row_data) { continue; }
num_table_row_data = table_row_data.length;
if (!num_table_row_data) { continue; }
temp_added_line = "";
temp_deleted_line = "";
line_number_flag = 0;
num_diff_addlines = 0;
num_diff_deletedlines = 0;
num_diff_context_lines = 0;
num_diff_undefined_lines = 0;
for (table_datum_index=0; table_datum_index
temp_table_datum = table_row_data[table_datum_index];
if (!temp_table_datum) { continue; }
if (temp_table_datum.className == "diff-lineno") {
temp_table_datum_text_node = temp_table_datum.firstChild;
if (!temp_table_datum_text_node) { continue; }
if (temp_table_datum_text_node.nodeType != 3) { continue; }
temp_table_datum_text = temp_table_datum_text_node.data;
temp_table_datum_text = temp_table_datum_text.replace(/[^0-9]*/ig, "");
if (line_number_flag == 0) {
current_old_line_number = temp_table_datum_text - 2;
line_number_flag = 1;
} else if (line_number_flag == 1) {
current_new_line_number = temp_table_datum_text - 2;
line_number_flag = 2;
} else if (line_number_flag == 2) {
// ignore this table_datum as anomalous
// there should be only two line numbers in any table row
} else {
alert_string = "ERROR: Line_number_flag = " + line_number_flag + " in datum " + table_datum_index + " of diff table row " + table_row_index + ".\n";
window.alert(alert_string);
return;
}
} else if (temp_table_datum.className == "diff-multi") {
temp_table_datum_text_node = temp_table_datum.firstChild;
if (!temp_table_datum_text_node) { continue; }
if (temp_table_datum_text_node.nodeType == 3) {
num_revisions = 0; // to flag for errors
temp_table_datum_text = temp_table_datum_text_node.data;
if (temp_table_datum_text.match(/^\(One/)) {
num_revisions = 2;
} else {
temp_table_datum_text = temp_table_datum_text.replace(/[^0-9]*/ig, "");
if (temp_table_datum_text) {
num_revisions = temp_table_datum_text;
num_revisions++;
}
}
if (num_revisions == 1) { // should never happen, but...
revisions = "The newer version is separated from the older version by one revision.";
} else {
revisions = "The newer version is separated from the older version by " + num_revisions + " revisions.";
}
} // closes check that the first child node is a text node
} else if (temp_table_datum.className == "diff-context") {
num_diff_context_lines++;
} else if (temp_table_datum.className == "diff-addedline") {
num_diff_addedlines = 1;
num_added_spans = 0;
added_span_text = "";
temp_added_line = temp_table_datum.innerHTML;
if (temp_added_line) {
// replace HTML tags
temp_added_line = temp_added_line.replace(/>/ig, ">");
temp_added_line = temp_added_line.replace(/</ig, "<");
temp_added_line = temp_added_line.replace(/(<([^>]+)>)/ig,"");
// replace renamed wiki links
temp_added_line = temp_added_line.replace(/\[\[([^\|\]]+?)\|([^\|]+?)\]\]/ig,"$2");
// replace renamed HTTP links, such as external links and diffs
temp_added_line = temp_added_line.replace(/\[http:([^\s]+)\s(.*?)\]/, "$2");
temp_added_line = temp_added_line.replace(/&/ig, "&");
temp_added_line = temp_added_line.replace(/ /ig, " ");
temp_added_line = temp_added_line.replace(/ /ig, " ");
temp_added_line = temp_added_line.replace(/\'\'\'/ig, "");
temp_added_line = temp_added_line.replace(/\'\'/ig, "");
temp_added_line = temp_added_line.replace(/\s+/ig, " ");
} else { temp_added_line = ""; }
if (temp_added_line.replace(/\s/ig, "").length < 1) { num_diff_addedlines = 0; continue; }
added_span_nodes = temp_table_datum.getElementsByTagName("SPAN");
if (!added_span_nodes) { num_added_spans = 0; continue; }
num_potential_spans = added_span_nodes.length;
for (span_index=0; span_index
temp_added_span = added_span_nodes[span_index];
if (!temp_added_span) { continue; }
temp_added_span_text = temp_added_span.innerHTML;
if (!temp_added_span_text) { continue; }
temp_added_span_text = temp_added_span_text.replace(/(<([^>]+)>)/ig,"");
if (!temp_added_span_text) { continue; }
num_added_spans++;
added_span_text += "\t Addition " + num_added_spans + ": " + temp_added_span_text + "\n";
} // closes loop over the added spans
added_span_text = "The " + num_added_spans + " additions were:\n" + added_span_text;
} else if (temp_table_datum.className == "diff-deletedline") {
num_diff_deletedlines = 1;
num_deleted_spans = 0;
deleted_span_text = "";
temp_deleted_line = temp_table_datum.innerHTML;
if (temp_deleted_line) {
// replace HTML tags
temp_deleted_line = temp_deleted_line.replace(/>/ig, ">");
temp_deleted_line = temp_deleted_line.replace(/</ig, "<");
temp_deleted_line = temp_deleted_line.replace(/(<([^>]+)>)/ig,"");
// replace renamed wiki links
temp_deleted_line = temp_deleted_line.replace(/\[\[([^\|\]]+?)\|([^\|]+?)\]\]/ig,"$2");
// replace renamed HTTP links, such as external links and diffs
temp_deleted_line = temp_deleted_line.replace(/\[http:([^\s]+)\s(.*?)\]/, "$2");
temp_deleted_line = temp_deleted_line.replace(/&/ig, "&");
temp_deleted_line = temp_deleted_line.replace(/ /ig, " ");
temp_deleted_line = temp_deleted_line.replace(/ /ig, " ");
temp_deleted_line = temp_deleted_line.replace(/\'\'\'/ig, "");
temp_deleted_line = temp_deleted_line.replace(/\'\'/ig, "");
temp_deleted_line = temp_deleted_line.replace(/\s+/ig, " ");
} else { temp_deleted_line = ""; }
if (temp_deleted_line.replace(/\s/ig, "").length < 1) { num_diff_deletedlines = 0; continue; }
deleted_span_nodes = temp_table_datum.getElementsByTagName("SPAN");
if (!deleted_span_nodes) { num_deleted_spans = 0; continue; }
num_potential_spans = deleted_span_nodes.length;
for (span_index=0; span_index
temp_deleted_span = deleted_span_nodes[span_index];
if (!temp_deleted_span) { continue; }
temp_deleted_span_text = temp_deleted_span.innerHTML;
if (!temp_deleted_span_text) { continue; }
temp_deleted_span_text = temp_deleted_span_text.replace(/(<([^>]+)>)/ig,"");
if (!temp_deleted_span_text) { continue; }
num_deleted_spans++;
deleted_span_text += "\t Deletion " + num_deleted_spans + ": " + temp_deleted_span_text + "\n";
} // closes loop over the deleted spans
deleted_span_text = "The " + num_deleted_spans + " deletions were:\n" + deleted_span_text;
} else if (temp_table_datum.className == "diff-marker") {
// do nothing
} else {
num_diff_undefined_lines++;
} // closes classification of the table datum
} // closes loop over the data within a table row
if ((num_diff_addedlines > 0) && (temp_added_line) && (num_diff_deletedlines > 0) && (temp_deleted_line)) {
current_new_line_number++;
current_old_line_number++;
num_replacements++;
alert_string = "Text replacement " + num_replacements + " in line number " + current_new_line_number + " of the newer version (line number " + current_old_line_number + " of the older version)\n\n";
alert_string += "There were " + num_added_spans + " additions and " + num_deleted_spans + " deletions to arrive at the current version of this line:\n\n";
alert_string += temp_added_line + "\n\n";
if ((num_added_spans>15) && (alert_string)) {
num_alert_strings++;
alert_string_list[num_alert_strings-1] = alert_string;
//				window.alert(alert_string);
alert_string = "";
}
if (num_added_spans>0) {
alert_string += added_span_text;
}
if ((num_deleted_spans>15) && (alert_string)) {
num_alert_strings++;
alert_string_list[num_alert_strings-1] = alert_string;
//				window.alert(alert_string);
alert_string = "";
}
if (num_deleted_spans>0) {
alert_string += deleted_span_text;
}
if (alert_string) {
num_alert_strings++;
alert_string_list[num_alert_strings-1] = alert_string;
//				window.alert(alert_string);
}
} else if ((num_diff_addedlines > 0) && (temp_added_line)) {
num_additions++;
current_new_line_number++;
alert_string = "Text addition " + num_additions + " in line number " + current_new_line_number + " of the newer version (line number " + current_old_line_number + " of the older version)\n\n";
alert_string += "The following line was added to the article:\n\n";
alert_string += temp_added_line;
num_alert_strings++;
alert_string_list[num_alert_strings-1] = alert_string;
//			window.alert(alert_string);
} else if ((num_diff_deletedlines > 0) && (temp_deleted_line)) {
num_deletions++;
current_old_line_number++;
alert_string = "Text deletion " + num_deletions + " in line number " + current_new_line_number + " of the newer version (line number " + current_old_line_number + " of the older version)\n\n";
alert_string += "The following line was deleted from the article:\n\n";
alert_string += temp_deleted_line;
num_alert_strings++;
alert_string_list[num_alert_strings-1] = alert_string;
//			window.alert(alert_string);
} else if (num_diff_context_lines == 2) {
current_new_line_number++;
current_old_line_number++;
} // closes classification change as addition, deletion or replacement
} // closes loop over the table rows
// Report the results
alert_string = "";
if (revisions) {
alert_string += revisions + "\n\n";
}
num_changes = num_additions + num_deletions + num_replacements;
if (num_changes == 0) {
alert_string += "The two versions are identical.";
window.alert(alert_string);
} else {
alert_string += "The newer version differs by ";
if (num_additions == 1) {
alert_string += "one addition";
} else if (num_additions > 1) {
alert_string += num_additions + " additions";
}
if (num_additions>0) {
if (num_additions == num_changes) {
alert_string += ".\n\n";
} else if ((num_deletions == 0) || (num_replacements == 0)) {
alert_string += " and ";
} else {
alert_string += ", ";
}
}
if (num_deletions == 1) {
alert_string += "one deletion";
} else if (num_deletions > 1) {
alert_string += num_deletions + " deletions";
}
if (num_deletions>0) {
if (num_replacements > 0) {
alert_string += " and ";
} else {
alert_string += ".\n\n";
}
}
if (num_replacements == 1) {
alert_string += "one replacement.\n\n";
} else if (num_replacements > 1) {
alert_string += num_replacements + " replacements.\n\n";
}
if (num_alert_strings == 1) {
alert_string += "These changes will be described on the following alert window.\n";
} else if (num_alert_strings > 1) {
alert_string += "These changes will be described on the following " + num_alert_strings + " alert windows.\n";
}
window.alert(alert_string);
for (alert_string_index=0; alert_string_index
alert_string = alert_string_list[alert_string_index];
window.alert(alert_string);
}
} // closes check for zero changes
} // closes function quickDiffs()
addOnloadHook(function () {
mw.util.addPortletLink('p-cactions', 'javascript:quickDiffs()', 'qd', 'ca-quickdiff', 'Summarizes the differences between two page versions', 'b', '');
});
//