view mercurial/templates/static/mercurial.js @ 35605:45a816361926

hgweb: drop support of browsers that don't understand <canvas> (BC)

Internet Explorer 8 and below need excanvas aka ExplorerCanvas to support
canvas tag at all. We used to vendor the library in Mercurial, but IE8 was
discontinued and all support for it ceased in January 2016. We should do the
same and remove excanvas library.

Apart from just cleaning up code, this will also make downstream Debian
packages stop depending on libjs-excanvas, for example.

// mercurial.js - JavaScript utility functions
//
// Rendering of branch DAGs on the client side
// Display of elapsed time
// Show or hide diffstat
//
// Copyright 2008 Dirkjan Ochtman <dirkjan AT ochtman DOT nl>
// Copyright 2006 Alexander Schremmer <alex AT alexanderweb DOT de>
//
// derived from code written by Scott James Remnant <[e-mail]>
// Copyright 2005 Canonical Ltd.
//
// This software may be used and distributed according to the terms
// of the GNU General Public License, incorporated herein by reference.

var colors = [
	[ 1.0, 0.0, 0.0 ],
	[ 1.0, 1.0, 0.0 ],
	[ 0.0, 1.0, 0.0 ],
	[ 0.0, 1.0, 1.0 ],
	[ 0.0, 0.0, 1.0 ],
	[ 1.0, 0.0, 1.0 ]
];

function Graph() {

	this.canvas = document.getElementById('graph');
	this.ctx = this.canvas.getContext('2d');
	this.ctx.strokeStyle = 'rgb(0, 0, 0)';
	this.ctx.fillStyle = 'rgb(0, 0, 0)';
	this.bg = [0, 4];
	this.cell = [2, 0];
	this.columns = 0;

}

Graph.prototype = {
	reset: function() {
		this.bg = [0, 4];
		this.cell = [2, 0];
		this.columns = 0;
	},

	scale: function(height) {
		this.bg_height = height;
		this.box_size = Math.floor(this.bg_height / 1.2);
		this.cell_height = this.box_size;
	},

	setColor: function(color, bg, fg) {

		// Set the colour.
		//
		// If color is a string, expect an hexadecimal RGB
		// value and apply it unchanged. If color is a number,
		// pick a distinct colour based on an internal wheel;
		// the bg parameter provides the value that should be
		// assigned to the 'zero' colours and the fg parameter
		// provides the multiplier that should be applied to
		// the foreground colours.
		var s;
		if(typeof color === "string") {
			s = "#" + color;
		} else { //typeof color === "number"
			color %= colors.length;
			var red = (colors[color][0] * fg) || bg;
			var green = (colors[color][1] * fg) || bg;
			var blue = (colors[color][2] * fg) || bg;
			red = Math.round(red * 255);
			green = Math.round(green * 255);
			blue = Math.round(blue * 255);
			s = 'rgb(' + red + ', ' + green + ', ' + blue + ')';
		}
		this.ctx.strokeStyle = s;
		this.ctx.fillStyle = s;
		return s;

	},

	edge: function(x0, y0, x1, y1, color, width) {

		this.setColor(color, 0.0, 0.65);
		if(width >= 0)
			 this.ctx.lineWidth = width;
		this.ctx.beginPath();
		this.ctx.moveTo(x0, y0);
		this.ctx.lineTo(x1, y1);
		this.ctx.stroke();

	},

	graphNodeCurrent: function(x, y, radius) {
		this.ctx.lineWidth = 2;
		this.ctx.beginPath();
		this.ctx.arc(x, y, radius * 1.75, 0, Math.PI * 2, true);
		this.ctx.stroke();
	},

	graphNodeClosing: function(x, y, radius) {
		this.ctx.fillRect(x - radius, y - 1.5, radius * 2, 3);
	},

	graphNodeUnstable: function(x, y, radius) {
		var x30 = radius * Math.cos(Math.PI / 6);
		var y30 = radius * Math.sin(Math.PI / 6);
		this.ctx.lineWidth = 2;
		this.ctx.beginPath();
		this.ctx.moveTo(x, y - radius);
		this.ctx.lineTo(x, y + radius);
		this.ctx.moveTo(x - x30, y - y30);
		this.ctx.lineTo(x + x30, y + y30);
		this.ctx.moveTo(x - x30, y + y30);
		this.ctx.lineTo(x + x30, y - y30);
		this.ctx.stroke();
	},

	graphNodeObsolete: function(x, y, radius) {
		var p45 = radius * Math.cos(Math.PI / 4);
		this.ctx.lineWidth = 3;
		this.ctx.beginPath();
		this.ctx.moveTo(x - p45, y - p45);
		this.ctx.lineTo(x + p45, y + p45);
		this.ctx.moveTo(x - p45, y + p45);
		this.ctx.lineTo(x + p45, y - p45);
		this.ctx.stroke();
	},

	graphNodeNormal: function(x, y, radius) {
		this.ctx.beginPath();
		this.ctx.arc(x, y, radius, 0, Math.PI * 2, true);
		this.ctx.fill();
	},

	vertex: function(x, y, radius, color, parity, cur) {
		this.ctx.save();
		this.setColor(color, 0.25, 0.75);
		if (cur.graphnode[0] === '@') {
			this.graphNodeCurrent(x, y, radius);
		}
		switch (cur.graphnode.substr(-1)) {
			case '_':
				this.graphNodeClosing(x, y, radius);
				break;
			case '*':
				this.graphNodeUnstable(x, y, radius);
				break;
			case 'x':
				this.graphNodeObsolete(x, y, radius);
				break;
			default:
				this.graphNodeNormal(x, y, radius);
		}
		this.ctx.restore();

		var left = (this.bg_height - this.box_size) + (this.columns + 1) * this.box_size;
		var item = document.querySelector('[data-node="' + cur.node + '"]');
		if (item) {
			item.style.paddingLeft = left + 'px';
		}
	},

	render: function(data) {

		var i, j, cur, line, start, end, color, x, y, x0, y0, x1, y1, column, radius;

		var cols = 0;
		for (i = 0; i < data.length; i++) {
			cur = data[i];
			for (j = 0; j < cur.edges.length; j++) {
				line = cur.edges[j];
				cols = Math.max(cols, line[0], line[1]);
			}
		}
		this.canvas.width = (cols + 1) * this.bg_height;
		this.canvas.height = (data.length + 1) * this.bg_height - 27;

		for (i = 0; i < data.length; i++) {

			var parity = i % 2;
			this.cell[1] += this.bg_height;
			this.bg[1] += this.bg_height;

			cur = data[i];
			var fold = false;

			var prevWidth = this.ctx.lineWidth;
			for (j = 0; j < cur.edges.length; j++) {

				line = cur.edges[j];
				start = line[0];
				end = line[1];
				color = line[2];
				var width = line[3];
				if(width < 0)
					 width = prevWidth;
				var branchcolor = line[4];
				if(branchcolor)
					color = branchcolor;

				if (end > this.columns || start > this.columns) {
					this.columns += 1;
				}

				if (start === this.columns && start > end) {
					fold = true;
				}

				x0 = this.cell[0] + this.box_size * start + this.box_size / 2;
				y0 = this.bg[1] - this.bg_height / 2;
				x1 = this.cell[0] + this.box_size * end + this.box_size / 2;
				y1 = this.bg[1] + this.bg_height / 2;

				this.edge(x0, y0, x1, y1, color, width);

			}
			this.ctx.lineWidth = prevWidth;

			// Draw the revision node in the right column

			column = cur.vertex[0];
			color = cur.vertex[1];

			radius = this.box_size / 8;
			x = this.cell[0] + this.box_size * column + this.box_size / 2;
			y = this.bg[1] - this.bg_height / 2;
			this.vertex(x, y, radius, color, parity, cur);

			if (fold) this.columns -= 1;

		}

	}

};


function process_dates(parentSelector){

	// derived from code from mercurial/templatefilter.py

	var scales = {
		'year':  365 * 24 * 60 * 60,
		'month':  30 * 24 * 60 * 60,
		'week':    7 * 24 * 60 * 60,
		'day':    24 * 60 * 60,
		'hour':   60 * 60,
		'minute': 60,
		'second': 1
	};

	function format(count, string){
		var ret = count + ' ' + string;
		if (count > 1){
			ret = ret + 's';
		}
 		return ret;
 	}

	function shortdate(date){
		var ret = date.getFullYear() + '-';
		// getMonth() gives a 0-11 result
		var month = date.getMonth() + 1;
		if (month <= 9){
			ret += '0' + month;
		} else {
			ret += month;
		}
		ret += '-';
		var day = date.getDate();
		if (day <= 9){
			ret += '0' + day;
		} else {
			ret += day;
		}
		return ret;
	}

 	function age(datestr){
 		var now = new Date();
 		var once = new Date(datestr);
		if (isNaN(once.getTime())){
			// parsing error
			return datestr;
		}

		var delta = Math.floor((now.getTime() - once.getTime()) / 1000);

		var future = false;
		if (delta < 0){
			future = true;
			delta = -delta;
			if (delta > (30 * scales.year)){
				return "in the distant future";
			}
		}

		if (delta > (2 * scales.year)){
			return shortdate(once);
		}

		for (var unit in scales){
			if (!scales.hasOwnProperty(unit)) { continue; }
			var s = scales[unit];
			var n = Math.floor(delta / s);
			if ((n >= 2) || (s === 1)){
				if (future){
					return format(n, unit) + ' from now';
				} else {
					return format(n, unit) + ' ago';
				}
			}
		}
	}

	var nodes = document.querySelectorAll((parentSelector || '') + ' .age');
	var dateclass = new RegExp('\\bdate\\b');
	for (var i=0; i<nodes.length; ++i){
		var node = nodes[i];
		var classes = node.className;
		var agevalue = age(node.textContent);
		if (dateclass.test(classes)){
			// We want both: date + (age)
			node.textContent += ' ('+agevalue+')';
		} else {
			node.title = node.textContent;
			node.textContent = agevalue;
		}
	}
}

function toggleDiffstat() {
    var curdetails = document.getElementById('diffstatdetails').style.display;
    var curexpand = curdetails === 'none' ? 'inline' : 'none';
    document.getElementById('diffstatdetails').style.display = curexpand;
    document.getElementById('diffstatexpand').style.display = curdetails;
}

function toggleLinewrap() {
    function getLinewrap() {
        var nodes = document.getElementsByClassName('sourcelines');
        // if there are no such nodes, error is thrown here
        return nodes[0].classList.contains('wrap');
    }

    function setLinewrap(enable) {
        var nodes = document.getElementsByClassName('sourcelines');
        var i;
        for (i = 0; i < nodes.length; i++) {
            if (enable) {
                nodes[i].classList.add('wrap');
            } else {
                nodes[i].classList.remove('wrap');
            }
        }

        var links = document.getElementsByClassName('linewraplink');
        for (i = 0; i < links.length; i++) {
            links[i].innerHTML = enable ? 'on' : 'off';
        }
    }

    setLinewrap(!getLinewrap());
}

function format(str, replacements) {
    return str.replace(/%(\w+)%/g, function(match, p1) {
        return String(replacements[p1]);
    });
}

function makeRequest(url, method, onstart, onsuccess, onerror, oncomplete) {
    var xhr = new XMLHttpRequest();
    xhr.onreadystatechange = function() {
        if (xhr.readyState === 4) {
            try {
                if (xhr.status === 200) {
                    onsuccess(xhr.responseText);
                } else {
                    throw 'server error';
                }
            } catch (e) {
                onerror(e);
            } finally {
                oncomplete();
            }
        }
    };

    xhr.open(method, url);
    xhr.overrideMimeType("text/xhtml; charset=" + document.characterSet.toLowerCase());
    xhr.send();
    onstart();
    return xhr;
}

function removeByClassName(className) {
    var nodes = document.getElementsByClassName(className);
    while (nodes.length) {
        nodes[0].parentNode.removeChild(nodes[0]);
    }
}

function docFromHTML(html) {
    var doc = document.implementation.createHTMLDocument('');
    doc.documentElement.innerHTML = html;
    return doc;
}

function appendFormatHTML(element, formatStr, replacements) {
    element.insertAdjacentHTML('beforeend', format(formatStr, replacements));
}

function adoptChildren(from, to) {
    var nodes = from.children;
    var curClass = 'c' + Date.now();
    while (nodes.length) {
        var node = nodes[0];
        node = document.adoptNode(node);
        node.classList.add(curClass);
        to.appendChild(node);
    }
    process_dates('.' + curClass);
}

function ajaxScrollInit(urlFormat,
                        nextPageVar,
                        nextPageVarGet,
                        containerSelector,
                        messageFormat,
                        mode) {
    var updateInitiated = false;
    var container = document.querySelector(containerSelector);

    function scrollHandler() {
        if (updateInitiated) {
            return;
        }

        var scrollHeight = document.documentElement.scrollHeight;
        var clientHeight = document.documentElement.clientHeight;
        var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;

        if (scrollHeight - (scrollTop + clientHeight) < 50) {
            updateInitiated = true;
            removeByClassName('scroll-loading-error');
            container.lastElementChild.classList.add('scroll-separator');

            if (!nextPageVar) {
                var message = {
                    'class': 'scroll-loading-info',
                    text: 'No more entries'
                };
                appendFormatHTML(container, messageFormat, message);
                return;
            }

            makeRequest(
                format(urlFormat, {next: nextPageVar}),
                'GET',
                function onstart() {
                    var message = {
                        'class': 'scroll-loading',
                        text: 'Loading...'
                    };
                    appendFormatHTML(container, messageFormat, message);
                },
                function onsuccess(htmlText) {
                    var doc = docFromHTML(htmlText);

                    if (mode === 'graph') {
                        var graph = window.graph;
                        var dataStr = htmlText.match(/^\s*var data = (.*);$/m)[1];
                        var data = JSON.parse(dataStr);
                        if (data.length < nextPageVar) {
                            nextPageVar = undefined;
                        }
                        graph.reset();
                        adoptChildren(doc.querySelector('#graphnodes'), container.querySelector('#graphnodes'));
                        graph.render(data);
                    } else {
                        adoptChildren(doc.querySelector(containerSelector), container);
                    }

                    nextPageVar = nextPageVarGet(htmlText, nextPageVar);
                },
                function onerror(errorText) {
                    var message = {
                        'class': 'scroll-loading-error',
                        text: 'Error: ' + errorText
                    };
                    appendFormatHTML(container, messageFormat, message);
                },
                function oncomplete() {
                    removeByClassName('scroll-loading');
                    updateInitiated = false;
                    scrollHandler();
                }
            );
        }
    }

    window.addEventListener('scroll', scrollHandler);
    window.addEventListener('resize', scrollHandler);
    scrollHandler();
}

function renderDiffOptsForm() {
    // We use URLSearchParams for query string manipulation. Old browsers don't
    // support this API.
    if (!("URLSearchParams" in window)) {
        return;
    }

    var form = document.getElementById("diffopts-form");

    var KEYS = [
        "ignorews",
        "ignorewsamount",
        "ignorewseol",
        "ignoreblanklines",
    ];

    var urlParams = new window.URLSearchParams(window.location.search);

    function updateAndRefresh(e) {
        var checkbox = e.target;
        var name = checkbox.id.substr(0, checkbox.id.indexOf("-"));
        urlParams.set(name, checkbox.checked ? "1" : "0");
        window.location.search = urlParams.toString();
    }

    var allChecked = form.getAttribute("data-ignorews") === "1";

    for (var i = 0; i < KEYS.length; i++) {
        var key = KEYS[i];

        var checkbox = document.getElementById(key + "-checkbox");
        if (!checkbox) {
            continue;
        }

        var currentValue = form.getAttribute("data-" + key);
        checkbox.checked = currentValue !== "0";

        // ignorews implies ignorewsamount and ignorewseol.
        if (allChecked && (key === "ignorewsamount" || key === "ignorewseol")) {
            checkbox.checked = true;
            checkbox.disabled = true;
        }

        checkbox.addEventListener("change", updateAndRefresh, false);
    }

    form.style.display = 'block';
}

document.addEventListener('DOMContentLoaded', function() {
   process_dates();
}, false);