complete redesign: use nodejs on server instead of php - documentation to be updated

nodejs/node_modules/stylus/lib/cache/fs.js

@@ -0,0 +1,80 @@
+/**
+ * Module dependencies.
+ */
+
+var crypto = require('crypto')
+  , fs = require('fs')
+  , join = require('path').join
+  , version = require('../../package').version
+  , nodes = require('../nodes');
+
+var FSCache = module.exports = function(options) {
+  options = options || {};
+  this._location = options['cache location'] || '.styl-cache';
+  if (!fs.existsSync(this._location)) fs.mkdirSync(this._location);
+};
+
+/**
+ * Set cache item with given `key` to `value`.
+ *
+ * @param {String} key
+ * @param {Object} value
+ * @api private
+ */
+
+FSCache.prototype.set = function(key, value) {
+  fs.writeFileSync(join(this._location, key), JSON.stringify(value));
+};
+
+/**
+ * Get cache item with given `key`.
+ *
+ * @param {String} key
+ * @return {Object}
+ * @api private
+ */
+
+FSCache.prototype.get = function(key) {
+  var data = fs.readFileSync(join(this._location, key), 'utf-8');
+  return JSON.parse(data, FSCache.fromJSON);
+};
+
+/**
+ * Check if cache has given `key`.
+ *
+ * @param {String} key
+ * @return {Boolean}
+ * @api private
+ */
+
+FSCache.prototype.has = function(key) {
+  return fs.existsSync(join(this._location, key));
+};
+
+/**
+ * Generate key for the source `str` with `options`.
+ *
+ * @param {String} str
+ * @param {Object} options
+ * @return {String}
+ * @api private
+ */
+
+FSCache.prototype.key = function(str, options) {
+  var hash = crypto.createHash('sha1');
+  hash.update(str + version + options.prefix);
+  return hash.digest('hex');
+};
+
+/**
+ * JSON to Stylus nodes converter.
+ *
+ * @api private
+ */
+
+FSCache.fromJSON = function(key, val) {
+  if (val && val.__type) {
+    val.__proto__ = nodes[val.__type].prototype;
+  }
+  return val;
+};