forgejo-federation/web_src/js/gitGraph.js

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/* This is a customized version of https://github.com/bluef/gitgraph.js/blob/master/gitgraph.js
Changes include conversion to ES6 and linting fixes */
/*
* @license magnet:?xt=urn:btih:c80d50af7d3db9be66a4d0a86db0286e4fd33292&dn=bsd-3-clause.txt BSD 3-Clause
* Copyright (c) 2011, Terrence Lee <kill889@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
export default function gitGraph(canvas, rawGraphList, config) {
if (!canvas.getContext) {
return;
}
if (typeof config === 'undefined') {
config = {
unitSize: 20,
lineWidth: 3,
nodeRadius: 4
};
}
const flows = [];
const graphList = [];
const ctx = canvas.getContext('2d');
const devicePixelRatio = window.devicePixelRatio || 1;
const backingStoreRatio = ctx.webkitBackingStorePixelRatio
|| ctx.mozBackingStorePixelRatio
|| ctx.msBackingStorePixelRatio
|| ctx.oBackingStorePixelRatio
|| ctx.backingStorePixelRatio || 1;
const ratio = devicePixelRatio / backingStoreRatio;
const init = function () {
let maxWidth = 0;
let i;
const l = rawGraphList.length;
let row;
let midStr;
for (i = 0; i < l; i++) {
midStr = rawGraphList[i].replace(/\s+/g, ' ').replace(/^\s+|\s+$/g, '');
maxWidth = Math.max(midStr.replace(/(_|\s)/g, '').length, maxWidth);
row = midStr.split('');
graphList.unshift(row);
}
const width = maxWidth * config.unitSize;
const height = graphList.length * config.unitSize;
canvas.width = width * ratio;
canvas.height = height * ratio;
canvas.style.width = `${width}px`;
canvas.style.height = `${height}px`;
ctx.lineWidth = config.lineWidth;
ctx.lineJoin = 'round';
ctx.lineCap = 'round';
ctx.scale(ratio, ratio);
};
const genRandomStr = function () {
const chars = '0123456789ABCDEF';
const stringLength = 6;
let randomString = '', rnum, i;
for (i = 0; i < stringLength; i++) {
rnum = Math.floor(Math.random() * chars.length);
randomString += chars.substring(rnum, rnum + 1);
}
return randomString;
};
const findFlow = function (id) {
let i = flows.length;
while (i-- && flows[i].id !== id);
return i;
};
const findColomn = function (symbol, row) {
let i = row.length;
while (i-- && row[i] !== symbol);
return i;
};
const findBranchOut = function (row) {
if (!row) {
return -1;
}
let i = row.length;
while (i--
&& !(row[i - 1] && row[i] === '/' && row[i - 1] === '|')
&& !(row[i - 2] && row[i] === '_' && row[i - 2] === '|'));
return i;
};
const findLineBreak = function (row) {
if (!row) {
return -1;
}
let i = row.length;
while (i--
&& !(row[i - 1] && row[i - 2] && row[i] === ' ' && row[i - 1] === '|' && row[i - 2] === '_'));
return i;
};
const genNewFlow = function () {
let newId;
do {
newId = genRandomStr();
} while (findFlow(newId) !== -1);
return { id: newId, color: `#${newId}` };
};
// Draw methods
const drawLine = function (moveX, moveY, lineX, lineY, color) {
ctx.strokeStyle = color;
ctx.beginPath();
ctx.moveTo(moveX, moveY);
ctx.lineTo(lineX, lineY);
ctx.stroke();
};
const drawLineRight = function (x, y, color) {
drawLine(x, y + config.unitSize / 2, x + config.unitSize, y + config.unitSize / 2, color);
};
const drawLineUp = function (x, y, color) {
drawLine(x, y + config.unitSize / 2, x, y - config.unitSize / 2, color);
};
const drawNode = function (x, y, color) {
ctx.strokeStyle = color;
drawLineUp(x, y, color);
ctx.beginPath();
ctx.arc(x, y, config.nodeRadius, 0, Math.PI * 2, true);
ctx.fill();
};
const drawLineIn = function (x, y, color) {
drawLine(x + config.unitSize, y + config.unitSize / 2, x, y - config.unitSize / 2, color);
};
const drawLineOut = function (x, y, color) {
drawLine(x, y + config.unitSize / 2, x + config.unitSize, y - config.unitSize / 2, color);
};
const draw = function (graphList) {
let colomn, colomnIndex, prevColomn, condenseIndex, breakIndex = -1;
let x, y;
let color;
let nodePos;
let tempFlow;
let prevRowLength = 0;
let flowSwapPos = -1;
let lastLinePos;
let i, l;
let condenseCurrentLength, condensePrevLength = 0;
let inlineIntersect = false;
// initiate color array for first row
for (i = 0, l = graphList[0].length; i < l; i++) {
if (graphList[0][i] !== '_' && graphList[0][i] !== ' ') {
flows.push(genNewFlow());
}
}
y = (canvas.height / ratio) - config.unitSize * 0.5;
// iterate
for (i = 0, l = graphList.length; i < l; i++) {
x = config.unitSize * 0.5;
const currentRow = graphList[i];
const nextRow = graphList[i + 1];
const prevRow = graphList[i - 1];
flowSwapPos = -1;
condenseCurrentLength = currentRow.filter((val) => {
return (val !== ' ' && val !== '_');
}).length;
// pre process begin
// use last row for analysing
if (prevRow) {
if (!inlineIntersect) {
// intersect might happen
for (colomnIndex = 0; colomnIndex < prevRowLength; colomnIndex++) {
if (prevRow[colomnIndex + 1]
&& (prevRow[colomnIndex] === '/' && prevRow[colomnIndex + 1] === '|')
|| ((prevRow[colomnIndex] === '_' && prevRow[colomnIndex + 1] === '|')
&& (prevRow[colomnIndex + 2] === '/'))) {
flowSwapPos = colomnIndex;
// swap two flow
tempFlow = { id: flows[flowSwapPos].id, color: flows[flowSwapPos].color };
flows[flowSwapPos].id = flows[flowSwapPos + 1].id;
flows[flowSwapPos].color = flows[flowSwapPos + 1].color;
flows[flowSwapPos + 1].id = tempFlow.id;
flows[flowSwapPos + 1].color = tempFlow.color;
}
}
}
if (condensePrevLength < condenseCurrentLength
&& ((nodePos = findColomn('*', currentRow)) !== -1 // eslint-disable-line no-cond-assign
&& (findColomn('_', currentRow) === -1))) {
flows.splice(nodePos - 1, 0, genNewFlow());
}
if (prevRowLength > currentRow.length
&& (nodePos = findColomn('*', prevRow)) !== -1) { // eslint-disable-line no-cond-assign
if (findColomn('_', currentRow) === -1
&& findColomn('/', currentRow) === -1
&& findColomn('\\', currentRow) === -1) {
flows.splice(nodePos + 1, 1);
}
}
} // done with the previous row
prevRowLength = currentRow.length; // store for next round
colomnIndex = 0; // reset index
condenseIndex = 0;
condensePrevLength = 0;
breakIndex = -1; // reset break index
while (colomnIndex < currentRow.length) {
colomn = currentRow[colomnIndex];
if (colomn !== ' ' && colomn !== '_') {
++condensePrevLength;
}
// check and fix line break in next row
if (colomn === '/' && currentRow[colomnIndex - 1] && currentRow[colomnIndex - 1] === '|') {
/* eslint-disable-next-line */
if ((breakIndex = findLineBreak(nextRow)) !== -1) {
nextRow.splice(breakIndex, 1);
}
}
// if line break found replace all '/' with '|' after breakIndex in previous row
if (breakIndex !== -1 && colomn === '/' && colomnIndex > breakIndex) {
currentRow[colomnIndex] = '|';
colomn = '|';
}
if (colomn === ' '
&& currentRow[colomnIndex + 1]
&& currentRow[colomnIndex + 1] === '_'
&& currentRow[colomnIndex - 1]
&& currentRow[colomnIndex - 1] === '|') {
currentRow.splice(colomnIndex, 1);
currentRow[colomnIndex] = '/';
colomn = '/';
}
// create new flow only when no intersect happened
if (flowSwapPos === -1
&& colomn === '/'
&& currentRow[colomnIndex - 1]
&& currentRow[colomnIndex - 1] === '|') {
flows.splice(condenseIndex, 0, genNewFlow());
}
// change \ and / to | when it's in the last position of the whole row
if (colomn === '/' || colomn === '\\') {
if (!(colomn === '/' && findBranchOut(nextRow) === -1)) {
/* eslint-disable-next-line */
if ((lastLinePos = Math.max(findColomn('|', currentRow),
findColomn('*', currentRow))) !== -1
&& (lastLinePos < colomnIndex - 1)) {
while (currentRow[++lastLinePos] === ' ');
if (lastLinePos === colomnIndex) {
currentRow[colomnIndex] = '|';
}
}
}
}
if (colomn === '*'
&& prevRow
&& prevRow[condenseIndex + 1] === '\\') {
flows.splice(condenseIndex + 1, 1);
}
if (colomn !== ' ') {
++condenseIndex;
}
++colomnIndex;
}
condenseCurrentLength = currentRow.filter((val) => {
return (val !== ' ' && val !== '_');
}).length;
// do some clean up
if (flows.length > condenseCurrentLength) {
flows.splice(condenseCurrentLength, flows.length - condenseCurrentLength);
}
colomnIndex = 0;
// a little inline analysis and draw process
while (colomnIndex < currentRow.length) {
colomn = currentRow[colomnIndex];
prevColomn = currentRow[colomnIndex - 1];
if (currentRow[colomnIndex] === ' ') {
currentRow.splice(colomnIndex, 1);
x += config.unitSize;
continue;
}
// inline interset
if ((colomn === '_' || colomn === '/')
&& currentRow[colomnIndex - 1] === '|'
&& currentRow[colomnIndex - 2] === '_') {
inlineIntersect = true;
tempFlow = flows.splice(colomnIndex - 2, 1)[0];
flows.splice(colomnIndex - 1, 0, tempFlow);
currentRow.splice(colomnIndex - 2, 1);
colomnIndex -= 1;
} else {
inlineIntersect = false;
}
color = flows[colomnIndex].color;
switch (colomn) {
case '_':
drawLineRight(x, y, color);
x += config.unitSize;
break;
case '*':
drawNode(x, y, color);
break;
case '|':
drawLineUp(x, y, color);
break;
case '/':
if (prevColomn
&& (prevColomn === '/'
|| prevColomn === ' ')) {
x -= config.unitSize;
}
drawLineOut(x, y, color);
x += config.unitSize;
break;
case '\\':
drawLineIn(x, y, color);
break;
}
++colomnIndex;
}
y -= config.unitSize;
}
};
init();
draw(graphList);
}
// @end-license