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+/**
+ * class Ruler
+ *
+ * Helper class, used by [[MarkdownIt#core]], [[MarkdownIt#block]] and
+ * [[MarkdownIt#inline]] to manage sequences of functions (rules):
+ *
+ * - keep rules in defined order
+ * - assign the name to each rule
+ * - enable/disable rules
+ * - add/replace rules
+ * - allow assign rules to additional named chains (in the same)
+ * - cacheing lists of active rules
+ *
+ * You will not need use this class directly until write plugins. For simple
+ * rules control use [[MarkdownIt.disable]], [[MarkdownIt.enable]] and
+ * [[MarkdownIt.use]].
+ **/
+
+/**
+ * new Ruler()
+ **/
+function Ruler () {
+  // List of added rules. Each element is:
+  //
+  // {
+  //   name: XXX,
+  //   enabled: Boolean,
+  //   fn: Function(),
+  //   alt: [ name2, name3 ]
+  // }
+  //
+  this.__rules__ = []
+
+  // Cached rule chains.
+  //
+  // First level - chain name, '' for default.
+  // Second level - diginal anchor for fast filtering by charcodes.
+  //
+  this.__cache__ = null
+}
+
+// Helper methods, should not be used directly
+
+// Find rule index by name
+//
+Ruler.prototype.__find__ = function (name) {
+  for (let i = 0; i < this.__rules__.length; i++) {
+    if (this.__rules__[i].name === name) {
+      return i
+    }
+  }
+  return -1
+}
+
+// Build rules lookup cache
+//
+Ruler.prototype.__compile__ = function () {
+  const self = this
+  const chains = ['']
+
+  // collect unique names
+  self.__rules__.forEach(function (rule) {
+    if (!rule.enabled) { return }
+
+    rule.alt.forEach(function (altName) {
+      if (chains.indexOf(altName) < 0) {
+        chains.push(altName)
+      }
+    })
+  })
+
+  self.__cache__ = {}
+
+  chains.forEach(function (chain) {
+    self.__cache__[chain] = []
+    self.__rules__.forEach(function (rule) {
+      if (!rule.enabled) { return }
+
+      if (chain && rule.alt.indexOf(chain) < 0) { return }
+
+      self.__cache__[chain].push(rule.fn)
+    })
+  })
+}
+
+/**
+ * Ruler.at(name, fn [, options])
+ * - name (String): rule name to replace.
+ * - fn (Function): new rule function.
+ * - options (Object): new rule options (not mandatory).
+ *
+ * Replace rule by name with new function & options. Throws error if name not
+ * found.
+ *
+ * ##### Options:
+ *
+ * - __alt__ - array with names of "alternate" chains.
+ *
+ * ##### Example
+ *
+ * Replace existing typographer replacement rule with new one:
+ *
+ * ```javascript
+ * var md = require('markdown-it')();
+ *
+ * md.core.ruler.at('replacements', function replace(state) {
+ *   //...
+ * });
+ * ```
+ **/
+Ruler.prototype.at = function (name, fn, options) {
+  const index = this.__find__(name)
+  const opt = options || {}
+
+  if (index === -1) { throw new Error('Parser rule not found: ' + name) }
+
+  this.__rules__[index].fn = fn
+  this.__rules__[index].alt = opt.alt || []
+  this.__cache__ = null
+}
+
+/**
+ * Ruler.before(beforeName, ruleName, fn [, options])
+ * - beforeName (String): new rule will be added before this one.
+ * - ruleName (String): name of added rule.
+ * - fn (Function): rule function.
+ * - options (Object): rule options (not mandatory).
+ *
+ * Add new rule to chain before one with given name. See also
+ * [[Ruler.after]], [[Ruler.push]].
+ *
+ * ##### Options:
+ *
+ * - __alt__ - array with names of "alternate" chains.
+ *
+ * ##### Example
+ *
+ * ```javascript
+ * var md = require('markdown-it')();
+ *
+ * md.block.ruler.before('paragraph', 'my_rule', function replace(state) {
+ *   //...
+ * });
+ * ```
+ **/
+Ruler.prototype.before = function (beforeName, ruleName, fn, options) {
+  const index = this.__find__(beforeName)
+  const opt = options || {}
+
+  if (index === -1) { throw new Error('Parser rule not found: ' + beforeName) }
+
+  this.__rules__.splice(index, 0, {
+    name: ruleName,
+    enabled: true,
+    fn,
+    alt: opt.alt || []
+  })
+
+  this.__cache__ = null
+}
+
+/**
+ * Ruler.after(afterName, ruleName, fn [, options])
+ * - afterName (String): new rule will be added after this one.
+ * - ruleName (String): name of added rule.
+ * - fn (Function): rule function.
+ * - options (Object): rule options (not mandatory).
+ *
+ * Add new rule to chain after one with given name. See also
+ * [[Ruler.before]], [[Ruler.push]].
+ *
+ * ##### Options:
+ *
+ * - __alt__ - array with names of "alternate" chains.
+ *
+ * ##### Example
+ *
+ * ```javascript
+ * var md = require('markdown-it')();
+ *
+ * md.inline.ruler.after('text', 'my_rule', function replace(state) {
+ *   //...
+ * });
+ * ```
+ **/
+Ruler.prototype.after = function (afterName, ruleName, fn, options) {
+  const index = this.__find__(afterName)
+  const opt = options || {}
+
+  if (index === -1) { throw new Error('Parser rule not found: ' + afterName) }
+
+  this.__rules__.splice(index + 1, 0, {
+    name: ruleName,
+    enabled: true,
+    fn,
+    alt: opt.alt || []
+  })
+
+  this.__cache__ = null
+}
+
+/**
+ * Ruler.push(ruleName, fn [, options])
+ * - ruleName (String): name of added rule.
+ * - fn (Function): rule function.
+ * - options (Object): rule options (not mandatory).
+ *
+ * Push new rule to the end of chain. See also
+ * [[Ruler.before]], [[Ruler.after]].
+ *
+ * ##### Options:
+ *
+ * - __alt__ - array with names of "alternate" chains.
+ *
+ * ##### Example
+ *
+ * ```javascript
+ * var md = require('markdown-it')();
+ *
+ * md.core.ruler.push('my_rule', function replace(state) {
+ *   //...
+ * });
+ * ```
+ **/
+Ruler.prototype.push = function (ruleName, fn, options) {
+  const opt = options || {}
+
+  this.__rules__.push({
+    name: ruleName,
+    enabled: true,
+    fn,
+    alt: opt.alt || []
+  })
+
+  this.__cache__ = null
+}
+
+/**
+ * Ruler.enable(list [, ignoreInvalid]) -> Array
+ * - list (String|Array): list of rule names to enable.
+ * - ignoreInvalid (Boolean): set `true` to ignore errors when rule not found.
+ *
+ * Enable rules with given names. If any rule name not found - throw Error.
+ * Errors can be disabled by second param.
+ *
+ * Returns list of found rule names (if no exception happened).
+ *
+ * See also [[Ruler.disable]], [[Ruler.enableOnly]].
+ **/
+Ruler.prototype.enable = function (list, ignoreInvalid) {
+  if (!Array.isArray(list)) { list = [list] }
+
+  const result = []
+
+  // Search by name and enable
+  list.forEach(function (name) {
+    const idx = this.__find__(name)
+
+    if (idx < 0) {
+      if (ignoreInvalid) { return }
+      throw new Error('Rules manager: invalid rule name ' + name)
+    }
+    this.__rules__[idx].enabled = true
+    result.push(name)
+  }, this)
+
+  this.__cache__ = null
+  return result
+}
+
+/**
+ * Ruler.enableOnly(list [, ignoreInvalid])
+ * - list (String|Array): list of rule names to enable (whitelist).
+ * - ignoreInvalid (Boolean): set `true` to ignore errors when rule not found.
+ *
+ * Enable rules with given names, and disable everything else. If any rule name
+ * not found - throw Error. Errors can be disabled by second param.
+ *
+ * See also [[Ruler.disable]], [[Ruler.enable]].
+ **/
+Ruler.prototype.enableOnly = function (list, ignoreInvalid) {
+  if (!Array.isArray(list)) { list = [list] }
+
+  this.__rules__.forEach(function (rule) { rule.enabled = false })
+
+  this.enable(list, ignoreInvalid)
+}
+
+/**
+ * Ruler.disable(list [, ignoreInvalid]) -> Array
+ * - list (String|Array): list of rule names to disable.
+ * - ignoreInvalid (Boolean): set `true` to ignore errors when rule not found.
+ *
+ * Disable rules with given names. If any rule name not found - throw Error.
+ * Errors can be disabled by second param.
+ *
+ * Returns list of found rule names (if no exception happened).
+ *
+ * See also [[Ruler.enable]], [[Ruler.enableOnly]].
+ **/
+Ruler.prototype.disable = function (list, ignoreInvalid) {
+  if (!Array.isArray(list)) { list = [list] }
+
+  const result = []
+
+  // Search by name and disable
+  list.forEach(function (name) {
+    const idx = this.__find__(name)
+
+    if (idx < 0) {
+      if (ignoreInvalid) { return }
+      throw new Error('Rules manager: invalid rule name ' + name)
+    }
+    this.__rules__[idx].enabled = false
+    result.push(name)
+  }, this)
+
+  this.__cache__ = null
+  return result
+}
+
+/**
+ * Ruler.getRules(chainName) -> Array
+ *
+ * Return array of active functions (rules) for given chain name. It analyzes
+ * rules configuration, compiles caches if not exists and returns result.
+ *
+ * Default chain name is `''` (empty string). It can't be skipped. That's
+ * done intentionally, to keep signature monomorphic for high speed.
+ **/
+Ruler.prototype.getRules = function (chainName) {
+  if (this.__cache__ === null) {
+    this.__compile__()
+  }
+
+  // Chain can be empty, if rules disabled. But we still have to return Array.
+  return this.__cache__[chainName] || []
+}
+
+export default Ruler