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/**
* 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;
};
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