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Newer
100644
169 lines (153 sloc)
4.69 KB
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"use strict";
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var execSync = require('child_process').execSync;
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/**
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* print errors to console in an asynchronuous chain
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*
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* @param {string} err message text
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* @param {string} cmd error triggering command
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*/
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return function (err) {
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if (err) {
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console.error(`Error in ${err.toolbox || "svg-icon-toolbox"}:\n ${err.message}`);
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};
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};
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/**
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* enhances error with a custom header line
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*/
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exports.raiseErr = function (err, cmd, callback) {
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if (!(err instanceof Error)) {
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err = new Error(err);
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}
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if (err.toolbox === undefined) err.toolbox = cmd;
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return callback(err);
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};
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/**
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* synchronuously make sure a directory exists
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*
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* @param {string} dir directory name to make as needed
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* @param {function (any)} callback
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*/
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exports.testDir = function (dir, callback) {
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try {
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execSync(`mkdir -p ${dir}`);
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return callback(null);
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} catch (err) {
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}
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exports.readLines = function (fn, callback) {
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var reader;
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try {
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reader = readline.createInterface({
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input: fs.createReadStream(fn)
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});
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} catch (err) {
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return callback(err);
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}
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var lines = [];
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reader.on('line', (line) => {
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line = line.trim();
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if (line.length) lines.push(line);
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}).on('close', () => {
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callback(null, lines);
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});
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};
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// determine incomplete values or throw error on incomputables
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function viewPortValues (width, height, viewBox) {
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var errMessage = 'Cannot determine the size of the drawing.';
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var values = {}, vb, widthUnit, heightUnit;
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if (viewBox) {
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vb = viewBox.split(/[,\s]+/).map((str) => {
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return parseFloat(str);
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});
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if (vb[2] === 0 || vb[3] === 0) throw new Error(errMessage);
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}
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var regex = /[\d\.]+(?:px)?(.+)?$/;
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if (width) {
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widthUnit = width.match(regex)[1];
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values.width = parseFloat(width);
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if (values.width === 0) throw new Error(errMessage);
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}
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if (height) {
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heightUnit = height.match(regex)[1];
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values.height = parseFloat(height);
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if (values.height === 0) throw new Error(errMessage);
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}
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if (vb && vb.length === 4) {
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values.viewBox = vb;
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if (widthUnit) {
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if (widthUnit === '%' && values.width) {
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values.width *= vb[2] / 100;
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} else {
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throw new Error(errMessage);
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}
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}
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if (!values.width) {
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values.width = vb[2];
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}
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if (heightUnit) {
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if (heightUnit === '%' && values.height) {
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values.height *= vb[3] / 100;
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} else {
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throw new Error(errMessage);
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}
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}
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if (!values.height) {
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values.height = vb[3];
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}
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} else if (widthUnit || heightUnit || !values.width || !values.height) {
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throw new Error(errMessage);
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}
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return values;
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}
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*/
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exports.computeTransform = function (width, height, viewBox, preserveAspectRatio) {
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var viewport = viewPortValues(width, height, viewBox);
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if (!viewport.viewBox) return [];
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var par = preserveAspectRatio ? preserveAspectRatio.split(/\s/) : [];
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var align = par[0] || 'xMidYMid';
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var meetOrSlice = par[1] || 'meet';
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var sx = viewport.width / viewport.viewBox[2],
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sy = viewport.height / viewport.viewBox[3];
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if (align !== 'none') {
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if (meetOrSlice === 'slice') {
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sx = sy = Math.max(sx, sy);
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} else {
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sx = sy = Math.min(sx, sy);
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}
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}
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}
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var transform = [];
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if (tx !== 0 || ty !== 0) {
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transform.push(`translate(${tx} ${ty})`);
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}
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if (sx !== 1 || sy !== 1) {
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transform.push(`scale(${sx} ${sy})`);
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}