ce4c83ff
 wxy
初始提交
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// Cache system is a bit outdated and could do with work
module.exports = function(window, options, logger) {
var cache = null;
if (options.env !== 'development') {
try {
cache = (typeof window.localStorage === 'undefined') ? null : window.localStorage;
} catch (_) {}
}
return {
setCSS: function(path, lastModified, modifyVars, styles) {
if (cache) {
logger.info('saving ' + path + ' to cache.');
try {
cache.setItem(path, styles);
cache.setItem(path + ':timestamp', lastModified);
if (modifyVars) {
cache.setItem(path + ':vars', JSON.stringify(modifyVars));
}
} catch (e) {
// TODO - could do with adding more robust error handling
logger.error('failed to save "' + path + '" to local storage for caching.');
}
}
},
getCSS: function(path, webInfo, modifyVars) {
var css = cache && cache.getItem(path),
timestamp = cache && cache.getItem(path + ':timestamp'),
vars = cache && cache.getItem(path + ':vars');
modifyVars = modifyVars || {};
vars = vars || "{}"; // if not set, treat as the JSON representation of an empty object
if (timestamp && webInfo.lastModified &&
(new Date(webInfo.lastModified).valueOf() ===
new Date(timestamp).valueOf()) &&
JSON.stringify(modifyVars) === vars) {
// Use local copy
return css;
}
}
};
};
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