gitweb/static/js/blame_incremental.js
// Copyright (C) 2007, Fredrik Kuivinen <frekui@gmail.com>
// 2007, Petr Baudis <pasky@suse.cz>
// 2008-2011, Jakub Narebski <jnareb@gmail.com>
/**
* @fileOverview JavaScript side of Ajax-y 'blame_incremental' view in gitweb
* @license GPLv2 or later
*/
/* ============================================================ */
/*
* This code uses DOM methods instead of (nonstandard) innerHTML
* to modify page.
*
* innerHTML is non-standard IE extension, though supported by most
* browsers; however Firefox up to version 1.5 didn't implement it in
* a strict mode (application/xml+xhtml mimetype).
*
* Also my simple benchmarks show that using elem.firstChild.data =
* 'content' is slightly faster than elem.innerHTML = 'content'. It
* is however more fragile (text element fragment must exists), and
* less feature-rich (we cannot add HTML).
*
* Note that DOM 2 HTML is preferred over generic DOM 2 Core; the
* equivalent using DOM 2 Core is usually shown in comments.
*/
/* ............................................................ */
/* utility/helper functions (and variables) */
var projectUrl; // partial query + separator ('?' or ';')
// 'commits' is an associative map. It maps SHA1s to Commit objects.
var commits = {};
/**
* constructor for Commit objects, used in 'blame'
* @class Represents a blamed commit
* @param {String} sha1: SHA-1 identifier of a commit
*/
function Commit(sha1) {
if (this instanceof Commit) {
this.sha1 = sha1;
this.nprevious = 0; /* number of 'previous', effective parents */
} else {
return new Commit(sha1);
}
}
/* ............................................................ */
/* progress info, timing, error reporting */
var blamedLines = 0;
var totalLines = '???';
var div_progress_bar;
var div_progress_info;
/**
* Detects how many lines does a blamed file have,
* This information is used in progress info
*
* @returns {Number|String} Number of lines in file, or string '...'
*/
function countLines() {
var table =
document.getElementById('blame_table') ||
document.getElementsByTagName('table')[0];
if (table) {
return table.getElementsByTagName('tr').length - 1; // for header
} else {
return '...';
}
}
/**
* update progress info and length (width) of progress bar
*
* @globals div_progress_info, div_progress_bar, blamedLines, totalLines
*/
function updateProgressInfo() {
if (!div_progress_info) {
div_progress_info = document.getElementById('progress_info');
}
if (!div_progress_bar) {
div_progress_bar = document.getElementById('progress_bar');
}
if (!div_progress_info && !div_progress_bar) {
return;
}
var percentage = Math.floor(100.0*blamedLines/totalLines);
if (div_progress_info) {
div_progress_info.firstChild.data = blamedLines + ' / ' + totalLines +
' (' + padLeftStr(percentage, 3, '\u00A0') + '%)';
}
if (div_progress_bar) {
//div_progress_bar.setAttribute('style', 'width: '+percentage+'%;');
div_progress_bar.style.width = percentage + '%';
}
}
var t_interval_server = '';
var cmds_server = '';
var t0 = new Date();
/**
* write how much it took to generate data, and to run script
*
* @globals t0, t_interval_server, cmds_server
*/
function writeTimeInterval() {
var info_time = document.getElementById('generating_time');
if (!info_time || !t_interval_server) {
return;
}
var t1 = new Date();
info_time.firstChild.data += ' + (' +
t_interval_server + ' sec server blame_data / ' +
(t1.getTime() - t0.getTime())/1000 + ' sec client JavaScript)';
var info_cmds = document.getElementById('generating_cmd');
if (!info_time || !cmds_server) {
return;
}
info_cmds.firstChild.data += ' + ' + cmds_server;
}
/**
* show an error message alert to user within page (in progress info area)
* @param {String} str: plain text error message (no HTML)
*
* @globals div_progress_info
*/
function errorInfo(str) {
if (!div_progress_info) {
div_progress_info = document.getElementById('progress_info');
}
if (div_progress_info) {
div_progress_info.className = 'error';
div_progress_info.firstChild.data = str;
}
}
/* ............................................................ */
/* coloring rows during blame_data (git blame --incremental) run */
/**
* used to extract N from 'colorN', where N is a number,
* @constant
*/
var colorRe = /\bcolor([0-9]*)\b/;
/**
* return N if <tr class="colorN">, otherwise return null
* (some browsers require CSS class names to begin with letter)
*
* @param {HTMLElement} tr: table row element to check
* @param {String} tr.className: 'class' attribute of tr element
* @returns {Number|null} N if tr.className == 'colorN', otherwise null
*
* @globals colorRe
*/
function getColorNo(tr) {
if (!tr) {
return null;
}
var className = tr.className;
if (className) {
var match = colorRe.exec(className);
if (match) {
return parseInt(match[1], 10);
}
}
return null;
}
var colorsFreq = [0, 0, 0];
/**
* return one of given possible colors (currently least used one)
* example: chooseColorNoFrom(2, 3) returns 2 or 3
*
* @param {Number[]} arguments: one or more numbers
* assumes that 1 <= arguments[i] <= colorsFreq.length
* @returns {Number} Least used color number from arguments
* @globals colorsFreq
*/
function chooseColorNoFrom() {
// choose the color which is least used
var colorNo = arguments[0];
for (var i = 1; i < arguments.length; i++) {
if (colorsFreq[arguments[i]-1] < colorsFreq[colorNo-1]) {
colorNo = arguments[i];
}
}
colorsFreq[colorNo-1]++;
return colorNo;
}
/**
* given two neighbor <tr> elements, find color which would be different
* from color of both of neighbors; used to 3-color blame table
*
* @param {HTMLElement} tr_prev
* @param {HTMLElement} tr_next
* @returns {Number} color number N such that
* colorN != tr_prev.className && colorN != tr_next.className
*/
function findColorNo(tr_prev, tr_next) {
var color_prev = getColorNo(tr_prev);
var color_next = getColorNo(tr_next);
// neither of neighbors has color set
// THEN we can use any of 3 possible colors
if (!color_prev && !color_next) {
return chooseColorNoFrom(1,2,3);
}
// either both neighbors have the same color,
// or only one of neighbors have color set
// THEN we can use any color except given
var color;
if (color_prev === color_next) {
color = color_prev; // = color_next;
} else if (!color_prev) {
color = color_next;
} else if (!color_next) {
color = color_prev;
}
if (color) {
return chooseColorNoFrom((color % 3) + 1, ((color+1) % 3) + 1);
}
// neighbors have different colors
// THEN there is only one color left
return (3 - ((color_prev + color_next) % 3));
}
/* ............................................................ */
/* coloring rows like 'blame' after 'blame_data' finishes */
/**
* returns true if given row element (tr) is first in commit group
* to be used only after 'blame_data' finishes (after processing)
*
* @param {HTMLElement} tr: table row
* @returns {Boolean} true if TR is first in commit group
*/
function isStartOfGroup(tr) {
return tr.firstChild.className === 'sha1';
}
/**
* change colors to use zebra coloring (2 colors) instead of 3 colors
* concatenate neighbor commit groups belonging to the same commit
*
* @globals colorRe
*/
function fixColorsAndGroups() {
var colorClasses = ['light', 'dark'];
var linenum = 1;
var tr, prev_group;
var colorClass = 0;
var table =
document.getElementById('blame_table') ||
document.getElementsByTagName('table')[0];
while ((tr = document.getElementById('l'+linenum))) {
// index origin is 0, which is table header; start from 1
//while ((tr = table.rows[linenum])) { // <- it is slower
if (isStartOfGroup(tr, linenum, document)) {
if (prev_group &&
prev_group.firstChild.firstChild.href ===
tr.firstChild.firstChild.href) {
// we have to concatenate groups
var prev_rows = prev_group.firstChild.rowSpan || 1;
var curr_rows = tr.firstChild.rowSpan || 1;
prev_group.firstChild.rowSpan = prev_rows + curr_rows;
//tr.removeChild(tr.firstChild);
tr.deleteCell(0); // DOM2 HTML way
} else {
colorClass = (colorClass + 1) % 2;
prev_group = tr;
}
}
var tr_class = tr.className;
tr.className = tr_class.replace(colorRe, colorClasses[colorClass]);
linenum++;
}
}
/* ============================================================ */
/* main part: parsing response */
/**
* Function called for each blame entry, as soon as it finishes.
* It updates page via DOM manipulation, adding sha1 info, etc.
*
* @param {Commit} commit: blamed commit
* @param {Object} group: object representing group of lines,
* which blame the same commit (blame entry)
*
* @globals blamedLines
*/
function handleLine(commit, group) {
/*
This is the structure of the HTML fragment we are working
with:
<tr id="l123" class="">
<td class="sha1" title=""><a href=""> </a></td>
<td class="linenr"><a class="linenr" href="">123</a></td>
<td class="pre"># times (my ext3 doesn't).</td>
</tr>
*/
var resline = group.resline;
// format date and time string only once per commit
if (!commit.info) {
/* e.g. 'Kay Sievers, 2005-08-07 21:49:46 +0200' */
commit.info = commit.author + ', ' +
formatDateISOLocal(commit.authorTime, commit.authorTimezone);
}
// color depends on group of lines, not only on blamed commit
var colorNo = findColorNo(
document.getElementById('l'+(resline-1)),
document.getElementById('l'+(resline+group.numlines))
);
// loop over lines in commit group
for (var i = 0; i < group.numlines; i++, resline++) {
var tr = document.getElementById('l'+resline);
if (!tr) {
break;
}
/*
<tr id="l123" class="">
<td class="sha1" title=""><a href=""> </a></td>
<td class="linenr"><a class="linenr" href="">123</a></td>
<td class="pre"># times (my ext3 doesn't).</td>
</tr>
*/
var td_sha1 = tr.firstChild;
var a_sha1 = td_sha1.firstChild;
var a_linenr = td_sha1.nextSibling.firstChild;
/* <tr id="l123" class=""> */
var tr_class = '';
if (colorNo !== null) {
tr_class = 'color'+colorNo;
}
if (commit.boundary) {
tr_class += ' boundary';
}
if (commit.nprevious === 0) {
tr_class += ' no-previous';
} else if (commit.nprevious > 1) {
tr_class += ' multiple-previous';
}
tr.className = tr_class;
/* <td class="sha1" title="?" rowspan="?"><a href="?">?</a></td> */
if (i === 0) {
td_sha1.title = commit.info;
td_sha1.rowSpan = group.numlines;
a_sha1.href = projectUrl + 'a=commit;h=' + commit.sha1;
if (a_sha1.firstChild) {
a_sha1.firstChild.data = commit.sha1.substr(0, 8);
} else {
a_sha1.appendChild(
document.createTextNode(commit.sha1.substr(0, 8)));
}
if (group.numlines >= 2) {
var fragment = document.createDocumentFragment();
var br = document.createElement("br");
var match = commit.author.match(/\b([A-Z])\B/g);
if (match) {
var text = document.createTextNode(
match.join(''));
}
if (br && text) {
var elem = fragment || td_sha1;
elem.appendChild(br);
elem.appendChild(text);
if (fragment) {
td_sha1.appendChild(fragment);
}
}
}
} else {
//tr.removeChild(td_sha1); // DOM2 Core way
tr.deleteCell(0); // DOM2 HTML way
}
/* <td class="linenr"><a class="linenr" href="?">123</a></td> */
var linenr_commit =
('previous' in commit ? commit.previous : commit.sha1);
var linenr_filename =
('file_parent' in commit ? commit.file_parent : commit.filename);
a_linenr.href = projectUrl + 'a=blame_incremental' +
';hb=' + linenr_commit +
';f=' + encodeURIComponent(linenr_filename) +
'#l' + (group.srcline + i);
blamedLines++;
//updateProgressInfo();
}
}
// ----------------------------------------------------------------------
/**#@+
* @constant
*/
var sha1Re = /^([0-9a-f]{40}) ([0-9]+) ([0-9]+) ([0-9]+)/;
var infoRe = /^([a-z-]+) ?(.*)/;
var endRe = /^END ?([^ ]*) ?(.*)/;
/**@-*/
var curCommit = new Commit();
var curGroup = {};
/**
* Parse output from 'git blame --incremental [...]', received via
* XMLHttpRequest from server (blamedataUrl), and call handleLine
* (which updates page) as soon as blame entry is completed.
*
* @param {String[]} lines: new complete lines from blamedata server
*
* @globals commits, curCommit, curGroup, t_interval_server, cmds_server
* @globals sha1Re, infoRe, endRe
*/
function processBlameLines(lines) {
var match;
for (var i = 0, len = lines.length; i < len; i++) {
if ((match = sha1Re.exec(lines[i]))) {
var sha1 = match[1];
var srcline = parseInt(match[2], 10);
var resline = parseInt(match[3], 10);
var numlines = parseInt(match[4], 10);
var c = commits[sha1];
if (!c) {
c = new Commit(sha1);
commits[sha1] = c;
}
curCommit = c;
curGroup.srcline = srcline;
curGroup.resline = resline;
curGroup.numlines = numlines;
} else if ((match = infoRe.exec(lines[i]))) {
var info = match[1];
var data = match[2];
switch (info) {
case 'filename':
curCommit.filename = unquote(data);
// 'filename' information terminates the entry
handleLine(curCommit, curGroup);
updateProgressInfo();
break;
case 'author':
curCommit.author = data;
break;
case 'author-time':
curCommit.authorTime = parseInt(data, 10);
break;
case 'author-tz':
curCommit.authorTimezone = data;
break;
case 'previous':
curCommit.nprevious++;
// store only first 'previous' header
if (!('previous' in curCommit)) {
var parts = data.split(' ', 2);
curCommit.previous = parts[0];
curCommit.file_parent = unquote(parts[1]);
}
break;
case 'boundary':
curCommit.boundary = true;
break;
} // end switch
} else if ((match = endRe.exec(lines[i]))) {
t_interval_server = match[1];
cmds_server = match[2];
} else if (lines[i] !== '') {
// malformed line
} // end if (match)
} // end for (lines)
}
/**
* Process new data and return pointer to end of processed part
*
* @param {String} unprocessed: new data (from nextReadPos)
* @param {Number} nextReadPos: end of last processed data
* @return {Number} end of processed data (new value for nextReadPos)
*/
function processData(unprocessed, nextReadPos) {
var lastLineEnd = unprocessed.lastIndexOf('\n');
if (lastLineEnd !== -1) {
var lines = unprocessed.substring(0, lastLineEnd).split('\n');
nextReadPos += lastLineEnd + 1 /* 1 == '\n'.length */;
processBlameLines(lines);
} // end if
return nextReadPos;
}
/**
* Handle XMLHttpRequest errors
*
* @param {XMLHttpRequest} xhr: XMLHttpRequest object
* @param {Number} [xhr.pollTimer] ID of the timeout to clear
*
* @globals commits
*/
function handleError(xhr) {
errorInfo('Server error: ' +
xhr.status + ' - ' + (xhr.statusText || 'Error contacting server'));
if (typeof xhr.pollTimer === "number") {
clearTimeout(xhr.pollTimer);
delete xhr.pollTimer;
}
commits = {}; // free memory
}
/**
* Called after XMLHttpRequest finishes (loads)
*
* @param {XMLHttpRequest} xhr: XMLHttpRequest object
* @param {Number} [xhr.pollTimer] ID of the timeout to clear
*
* @globals commits
*/
function responseLoaded(xhr) {
if (typeof xhr.pollTimer === "number") {
clearTimeout(xhr.pollTimer);
delete xhr.pollTimer;
}
fixColorsAndGroups();
writeTimeInterval();
commits = {}; // free memory
}
/**
* handler for XMLHttpRequest onreadystatechange event
* @see startBlame
*
* @param {XMLHttpRequest} xhr: XMLHttpRequest object
* @param {Number} xhr.prevDataLength: previous value of xhr.responseText.length
* @param {Number} xhr.nextReadPos: start of unread part of xhr.responseText
* @param {Number} [xhr.pollTimer] ID of the timeout (to reset or cancel)
* @param {Boolean} fromTimer: if handler was called from timer
*/
function handleResponse(xhr, fromTimer) {
/*
* xhr.readyState
*
* Value Constant (W3C) Description
* -------------------------------------------------------------------
* 0 UNSENT open() has not been called yet.
* 1 OPENED send() has not been called yet.
* 2 HEADERS_RECEIVED send() has been called, and headers
* and status are available.
* 3 LOADING Downloading; responseText holds partial data.
* 4 DONE The operation is complete.
*/
if (xhr.readyState !== 4 && xhr.readyState !== 3) {
return;
}
// the server returned error
// try ... catch block is to work around bug in IE8
try {
if (xhr.readyState === 3 && xhr.status !== 200) {
return;
}
} catch (e) {
return;
}
if (xhr.readyState === 4 && xhr.status !== 200) {
handleError(xhr);
return;
}
// In konqueror xhr.responseText is sometimes null here...
if (xhr.responseText === null) {
return;
}
// extract new whole (complete) lines, and process them
if (xhr.prevDataLength !== xhr.responseText.length) {
xhr.prevDataLength = xhr.responseText.length;
var unprocessed = xhr.responseText.substring(xhr.nextReadPos);
xhr.nextReadPos = processData(unprocessed, xhr.nextReadPos);
}
// did we finish work?
if (xhr.readyState === 4) {
responseLoaded(xhr);
return;
}
// if we get from timer, we have to restart it
// otherwise onreadystatechange gives us partial response, timer not needed
if (fromTimer) {
setTimeout(function () {
handleResponse(xhr, true);
}, 1000);
} else if (typeof xhr.pollTimer === "number") {
clearTimeout(xhr.pollTimer);
delete xhr.pollTimer;
}
}
// ============================================================
// ------------------------------------------------------------
/**
* Incrementally update line data in blame_incremental view in gitweb.
*
* @param {String} blamedataUrl: URL to server script generating blame data.
* @param {String} bUrl: partial URL to project, used to generate links.
*
* Called from 'blame_incremental' view after loading table with
* file contents, a base for blame view.
*
* @globals t0, projectUrl, div_progress_bar, totalLines
*/
function startBlame(blamedataUrl, bUrl) {
var xhr = createRequestObject();
if (!xhr) {
errorInfo('ERROR: XMLHttpRequest not supported');
return;
}
t0 = new Date();
projectUrl = bUrl + (bUrl.indexOf('?') === -1 ? '?' : ';');
if ((div_progress_bar = document.getElementById('progress_bar'))) {
//div_progress_bar.setAttribute('style', 'width: 100%;');
div_progress_bar.style.cssText = 'width: 100%;';
}
totalLines = countLines();
updateProgressInfo();
/* add extra properties to xhr object to help processing response */
xhr.prevDataLength = -1; // used to detect if we have new data
xhr.nextReadPos = 0; // where unread part of response starts
xhr.onreadystatechange = function () {
handleResponse(xhr, false);
};
xhr.open('GET', blamedataUrl);
xhr.setRequestHeader('Accept', 'text/plain');
xhr.send(null);
// not all browsers call onreadystatechange event on each server flush
// poll response using timer every second to handle this issue
xhr.pollTimer = setTimeout(function () {
handleResponse(xhr, true);
}, 1000);
}
/* end of blame_incremental.js */