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git/gitweb/gitweb.js

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JavaScript
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// Copyright (C) 2007, Fredrik Kuivinen <frekui@gmail.com>
// 2007, Petr Baudis <pasky@suse.cz>
// 2008-2009, Jakub Narebski <jnareb@gmail.com>
/**
* @fileOverview JavaScript code for gitweb (git web interface).
* @license GPLv2 or later
*/
/* ============================================================ */
/* functions for generic gitweb actions and views */
/**
* used to check if link has 'js' query parameter already (at end),
* and other reasons to not add 'js=1' param at the end of link
* @constant
*/
var jsExceptionsRe = /[;?]js=[01]$/;
/**
* Add '?js=1' or ';js=1' to the end of every link in the document
* that doesn't have 'js' query parameter set already.
*
* Links with 'js=1' lead to JavaScript version of given action, if it
* exists (currently there is only 'blame_incremental' for 'blame')
*
* @globals jsExceptionsRe
*/
function fixLinks() {
var allLinks = document.getElementsByTagName("a") || document.links;
for (var i = 0, len = allLinks.length; i < len; i++) {
var link = allLinks[i];
if (!jsExceptionsRe.test(link)) { // =~ /[;?]js=[01]$/;
link.href +=
(link.href.indexOf('?') === -1 ? '?' : ';') + 'js=1';
}
}
}
/* ============================================================ */
/*
* 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.
*/
/* ============================================================ */
/* generic utility functions */
/**
* pad number N with nonbreakable spaces on the left, to WIDTH characters
* example: padLeftStr(12, 3, '\u00A0') == '\u00A012'
* ('\u00A0' is nonbreakable space)
*
* @param {Number|String} input: number to pad
* @param {Number} width: visible width of output
* @param {String} str: string to prefix to string, e.g. '\u00A0'
* @returns {String} INPUT prefixed with (WIDTH - INPUT.length) x STR
*/
function padLeftStr(input, width, str) {
var prefix = '';
width -= input.toString().length;
while (width > 0) {
prefix += str;
width--;
}
return prefix + input;
}
/**
* Pad INPUT on the left to SIZE width, using given padding character CH,
* for example padLeft('a', 3, '_') is '__a'.
*
* @param {String} input: input value converted to string.
* @param {Number} width: desired length of output.
* @param {String} ch: single character to prefix to string.
*
* @returns {String} Modified string, at least SIZE length.
*/
function padLeft(input, width, ch) {
var s = input + "";
while (s.length < width) {
s = ch + s;
}
return s;
}
/**
* Create XMLHttpRequest object in cross-browser way
* @returns XMLHttpRequest object, or null
*/
function createRequestObject() {
try {
return new XMLHttpRequest();
} catch (e) {}
try {
return window.createRequest();
} catch (e) {}
try {
return new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {}
try {
return new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
return null;
}
/* ============================================================ */
/* utility/helper functions (and variables) */
var xhr; // XMLHttpRequest object
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 prohress 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 (curently 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 neigbour <tr> elements, find color which would be different
* from color of both of neighbours; 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 neighbours has color set
// THEN we can use any of 3 possible colors
if (!color_prev && !color_next) {
return chooseColorNoFrom(1,2,3);
}
// either both neighbours have the same color,
// or only one of neighbours 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);
}
// neighbours 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 neighbour 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++;
}
}
/* ............................................................ */
/* time and data */
/**
* used to extract hours and minutes from timezone info, e.g '-0900'
* @constant
*/
var tzRe = /^([+-][0-9][0-9])([0-9][0-9])$/;
/**
* return date in local time formatted in iso-8601 like format
* 'yyyy-mm-dd HH:MM:SS +/-ZZZZ' e.g. '2005-08-07 21:49:46 +0200'
*
* @param {Number} epoch: seconds since '00:00:00 1970-01-01 UTC'
* @param {String} timezoneInfo: numeric timezone '(+|-)HHMM'
* @returns {String} date in local time in iso-8601 like format
*
* @globals tzRe
*/
function formatDateISOLocal(epoch, timezoneInfo) {
var match = tzRe.exec(timezoneInfo);
// date corrected by timezone
var localDate = new Date(1000 * (epoch +
(parseInt(match[1],10)*3600 + parseInt(match[2],10)*60)));
var localDateStr = // e.g. '2005-08-07'
localDate.getUTCFullYear() + '-' +
padLeft(localDate.getUTCMonth()+1, 2, '0') + '-' +
padLeft(localDate.getUTCDate(), 2, '0');
var localTimeStr = // e.g. '21:49:46'
padLeft(localDate.getUTCHours(), 2, '0') + ':' +
padLeft(localDate.getUTCMinutes(), 2, '0') + ':' +
padLeft(localDate.getUTCSeconds(), 2, '0');
return localDateStr + ' ' + localTimeStr + ' ' + timezoneInfo;
}
/* ............................................................ */
/* unquoting/unescaping filenames */
/**#@+
* @constant
*/
var escCodeRe = /\\([^0-7]|[0-7]{1,3})/g;
var octEscRe = /^[0-7]{1,3}$/;
var maybeQuotedRe = /^\"(.*)\"$/;
/**#@-*/
/**
* unquote maybe git-quoted filename
* e.g. 'aa' -> 'aa', '"a\ta"' -> 'a a'
*
* @param {String} str: git-quoted string
* @returns {String} Unquoted and unescaped string
*
* @globals escCodeRe, octEscRe, maybeQuotedRe
*/
function unquote(str) {
function unq(seq) {
var es = {
// character escape codes, aka escape sequences (from C)
// replacements are to some extent JavaScript specific
t: "\t", // tab (HT, TAB)
n: "\n", // newline (NL)
r: "\r", // return (CR)
f: "\f", // form feed (FF)
b: "\b", // backspace (BS)
a: "\x07", // alarm (bell) (BEL)
e: "\x1B", // escape (ESC)
v: "\v" // vertical tab (VT)
};
if (seq.search(octEscRe) !== -1) {
// octal char sequence
return String.fromCharCode(parseInt(seq, 8));
} else if (seq in es) {
// C escape sequence, aka character escape code
return es[seq];
}
// quoted ordinary character
return seq;
}
var match = str.match(maybeQuotedRe);
if (match) {
str = match[1];
// perhaps str = eval('"'+str+'"'); would be enough?
str = str.replace(escCodeRe,
function (substr, p1, offset, s) { return unq(p1); });
}
return str;
}
/* ============================================================ */
/* 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&#39;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&#39;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();
}
}
// ----------------------------------------------------------------------
var inProgress = false; // are we processing response
/**#@+
* @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 = {};
var pollTimer = null;
/**
* 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
*
* @globals pollTimer, commits, inProgress
*/
function handleError(xhr) {
errorInfo('Server error: ' +
xhr.status + ' - ' + (xhr.statusText || 'Error contacting server'));
clearInterval(pollTimer);
commits = {}; // free memory
inProgress = false;
}
/**
* Called after XMLHttpRequest finishes (loads)
*
* @param {XMLHttpRequest} xhr: XMLHttpRequest object (unused)
*
* @globals pollTimer, commits, inProgress
*/
function responseLoaded(xhr) {
clearInterval(pollTimer);
fixColorsAndGroups();
writeTimeInterval();
commits = {}; // free memory
inProgress = false;
}
/**
* handler for XMLHttpRequest onreadystatechange event
* @see startBlame
*
* @globals xhr, inProgress
*/
function handleResponse() {
/*
* 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
if (xhr.readyState === 3 && xhr.status !== 200) {
return;
}
if (xhr.readyState === 4 && xhr.status !== 200) {
handleError(xhr);
return;
}
// In konqueror xhr.responseText is sometimes null here...
if (xhr.responseText === null) {
return;
}
// in case we were called before finished processing
if (inProgress) {
return;
} else {
inProgress = true;
}
// extract new whole (complete) lines, and process them
while (xhr.prevDataLength !== xhr.responseText.length) {
if (xhr.readyState === 4 &&
xhr.prevDataLength === xhr.responseText.length) {
break;
}
xhr.prevDataLength = xhr.responseText.length;
var unprocessed = xhr.responseText.substring(xhr.nextReadPos);
xhr.nextReadPos = processData(unprocessed, xhr.nextReadPos);
} // end while
// did we finish work?
if (xhr.readyState === 4 &&
xhr.prevDataLength === xhr.responseText.length) {
responseLoaded(xhr);
}
inProgress = false;
}
// ============================================================
// ------------------------------------------------------------
/**
* 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 xhr, t0, projectUrl, div_progress_bar, totalLines, pollTimer
*/
function startBlame(blamedataUrl, bUrl) {
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 = handleResponse;
//xhr.onreadystatechange = function () { handleResponse(xhr); };
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
pollTimer = setInterval(xhr.onreadystatechange, 1000);
}
// end of gitweb.js
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