--- /dev/null
+'use strict';
+
+var xtend = require('xtend');
+var escapes = require('markdown-escapes');
+var defaults = require('./defaults');
+
+module.exports = setOptions;
+
+function setOptions(options) {
+ var self = this;
+ var current = self.options;
+ var key;
+ var value;
+
+ if (options == null) {
+ options = {};
+ } else if (typeof options === 'object') {
+ options = xtend(options);
+ } else {
+ throw new Error(
+ 'Invalid value `' + options + '` ' +
+ 'for setting `options`'
+ );
+ }
+
+ for (key in defaults) {
+ value = options[key];
+
+ if (value == null) {
+ value = current[key];
+ }
+
+ if (
+ (key !== 'blocks' && typeof value !== 'boolean') ||
+ (key === 'blocks' && typeof value !== 'object')
+ ) {
+ throw new Error('Invalid value `' + value + '` for setting `options.' + key + '`');
+ }
+
+ options[key] = value;
+ }
+
+ self.options = options;
+ self.escape = escapes(options);
+
+ return self;
+}