Utilities.rewriteOrInlineUrls = function()

in src/css.build.js [307:344]
36 lines of code
9 McCabe index (conditional complexity)

        Utilities.rewriteOrInlineUrls = function (originalFileFSPath, originalFile, newFile, contents, forceBase64, inlineByteLimit) {
            var fs = require.nodeRequire('fs');
            var path = require.nodeRequire('path');
            return this._replaceURL(contents, function (url) {
                if (/\.(svg|png)$/.test(url)) {
                    var fsPath = path.join(path.dirname(originalFileFSPath), url);
                    var fileContents = fs.readFileSync(fsPath);
                    if (fileContents.length < inlineByteLimit) {
                        global.cssInlinedResources = global.cssInlinedResources || [];
                        var normalizedFSPath = fsPath.replace(/\\/g, '/');
                        if (global.cssInlinedResources.indexOf(normalizedFSPath) >= 0) {
                            // console.warn('CSS INLINING IMAGE AT ' + fsPath + ' MORE THAN ONCE. CONSIDER CONSOLIDATING CSS RULES');
                        }
                        global.cssInlinedResources.push(normalizedFSPath);
                        var MIME = /\.svg$/.test(url) ? 'image/svg+xml' : 'image/png';
                        var DATA = ';base64,' + fileContents.toString('base64');
                        if (!forceBase64 && /\.svg$/.test(url)) {
                            // .svg => url encode as explained at https://codepen.io/tigt/post/optimizing-svgs-in-data-uris
                            var newText = fileContents.toString()
                                .replace(/"/g, '\'')
                                .replace(/%/g, '%25')
                                .replace(/</g, '%3C')
                                .replace(/>/g, '%3E')
                                .replace(/&/g, '%26')
                                .replace(/#/g, '%23')
                                .replace(/\s+/g, ' ');
                            var encodedData = ',' + newText;
                            if (encodedData.length < DATA.length) {
                                DATA = encodedData;
                            }
                        }
                        return '"data:' + MIME + DATA + '"';
                    }
                }
                var absoluteUrl = Utilities.joinPaths(Utilities.pathOf(originalFile), url);
                return Utilities.relativePath(newFile, absoluteUrl);
            });
        };