'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var prosemirrorState = require('prosemirror-state');
var prosemirrorTransform = require('prosemirror-transform');

// ::- Input rules are regular expressions describing a piece of text
// that, when typed, causes something to happen. This might be
// changing two dashes into an emdash, wrapping a paragraph starting
// with `"> "` into a blockquote, or something entirely different.
var InputRule = function InputRule(match, handler) {
  this.match = match;
  this.handler = typeof handler == "string" ? stringHandler(handler) : handler;
};

function stringHandler(string) {
  return function(state, match, start, end) {
    var insert = string;
    if (match[1]) {
      var offset = match[0].lastIndexOf(match[1]);
      insert += match[0].slice(offset + match[1].length);
      start += offset;
      var cutOff = start - end;
      if (cutOff > 0) {
        insert = match[0].slice(offset - cutOff, offset) + insert;
        start = end;
      }
    }
    return state.tr.insertText(insert, start, end)
  }
}

var MAX_MATCH = 500;

// :: (config: {rules: [InputRule]}) → Plugin
// Create an input rules plugin. When enabled, it will cause text
// input that matches any of the given rules to trigger the rule's
// action.
function inputRules(ref) {
  var rules = ref.rules;

  var plugin = new prosemirrorState.Plugin({
    state: {
      init: function init() { return null },
      apply: function apply(tr, prev) {
        var stored = tr.getMeta(this);
        if (stored) { return stored }
        return tr.selectionSet || tr.docChanged ? null : prev
      }
    },

    props: {
      handleTextInput: function handleTextInput(view, from, to, text) {
        return run(view, from, to, text, rules, plugin)
      },
      handleDOMEvents: {
        compositionend: function (view) {
          setTimeout(function () {
            var ref = view.state.selection;
            var $cursor = ref.$cursor;
            if ($cursor) { run(view, $cursor.pos, $cursor.pos, "", rules, plugin); }
          });
        }
      }
    },

    isInputRules: true
  });
  return plugin
}

function run(view, from, to, text, rules, plugin) {
  if (view.composing) { return false }
  var state = view.state, $from = state.doc.resolve(from);
  if ($from.parent.type.spec.code) { return false }
  var textBefore = $from.parent.textBetween(Math.max(0, $from.parentOffset - MAX_MATCH), $from.parentOffset,
                                            null, "\ufffc") + text;
  for (var i = 0; i < rules.length; i++) {
    var match = rules[i].match.exec(textBefore);
    var tr = match && rules[i].handler(state, match, from - (match[0].length - text.length), to);
    if (!tr) { continue }
    view.dispatch(tr.setMeta(plugin, {transform: tr, from: from, to: to, text: text}));
    return true
  }
  return false
}

// :: (EditorState, ?(Transaction)) → bool
// This is a command that will undo an input rule, if applying such a
// rule was the last thing that the user did.
function undoInputRule(state, dispatch) {
  var plugins = state.plugins;
  for (var i = 0; i < plugins.length; i++) {
    var plugin = plugins[i], undoable = (void 0);
    if (plugin.spec.isInputRules && (undoable = plugin.getState(state))) {
      if (dispatch) {
        var tr = state.tr, toUndo = undoable.transform;
        for (var j = toUndo.steps.length - 1; j >= 0; j--)
          { tr.step(toUndo.steps[j].invert(toUndo.docs[j])); }
        if (undoable.text) {
          var marks = tr.doc.resolve(undoable.from).marks();
          tr.replaceWith(undoable.from, undoable.to, state.schema.text(undoable.text, marks));
        } else {
          tr.delete(undoable.from, undoable.to);
        }
        dispatch(tr);
      }
      return true
    }
  }
  return false
}

// :: InputRule Converts double dashes to an emdash.
var emDash = new InputRule(/--$/, "—");
// :: InputRule Converts three dots to an ellipsis character.
var ellipsis = new InputRule(/\.\.\.$/, "…");
// :: InputRule “Smart” opening double quotes.
var openDoubleQuote = new InputRule(/(?:^|[\s\{\[\(\<'"\u2018\u201C])(")$/, "“");
// :: InputRule “Smart” closing double quotes.
var closeDoubleQuote = new InputRule(/"$/, "”");
// :: InputRule “Smart” opening single quotes.
var openSingleQuote = new InputRule(/(?:^|[\s\{\[\(\<'"\u2018\u201C])(')$/, "‘");
// :: InputRule “Smart” closing single quotes.
var closeSingleQuote = new InputRule(/'$/, "’");

// :: [InputRule] Smart-quote related input rules.
var smartQuotes = [openDoubleQuote, closeDoubleQuote, openSingleQuote, closeSingleQuote];

// :: (RegExp, NodeType, ?union<Object, ([string]) → ?Object>, ?([string], Node) → bool) → InputRule
// Build an input rule for automatically wrapping a textblock when a
// given string is typed. The `regexp` argument is
// directly passed through to the `InputRule` constructor. You'll
// probably want the regexp to start with `^`, so that the pattern can
// only occur at the start of a textblock.
//
// `nodeType` is the type of node to wrap in. If it needs attributes,
// you can either pass them directly, or pass a function that will
// compute them from the regular expression match.
//
// By default, if there's a node with the same type above the newly
// wrapped node, the rule will try to [join](#transform.Transform.join) those
// two nodes. You can pass a join predicate, which takes a regular
// expression match and the node before the wrapped node, and can
// return a boolean to indicate whether a join should happen.
function wrappingInputRule(regexp, nodeType, getAttrs, joinPredicate) {
  return new InputRule(regexp, function (state, match, start, end) {
    var attrs = getAttrs instanceof Function ? getAttrs(match) : getAttrs;
    var tr = state.tr.delete(start, end);
    var $start = tr.doc.resolve(start), range = $start.blockRange(), wrapping = range && prosemirrorTransform.findWrapping(range, nodeType, attrs);
    if (!wrapping) { return null }
    tr.wrap(range, wrapping);
    var before = tr.doc.resolve(start - 1).nodeBefore;
    if (before && before.type == nodeType && prosemirrorTransform.canJoin(tr.doc, start - 1) &&
        (!joinPredicate || joinPredicate(match, before)))
      { tr.join(start - 1); }
    return tr
  })
}

// :: (RegExp, NodeType, ?union<Object, ([string]) → ?Object>) → InputRule
// Build an input rule that changes the type of a textblock when the
// matched text is typed into it. You'll usually want to start your
// regexp with `^` to that it is only matched at the start of a
// textblock. The optional `getAttrs` parameter can be used to compute
// the new node's attributes, and works the same as in the
// `wrappingInputRule` function.
function textblockTypeInputRule(regexp, nodeType, getAttrs) {
  return new InputRule(regexp, function (state, match, start, end) {
    var $start = state.doc.resolve(start);
    var attrs = getAttrs instanceof Function ? getAttrs(match) : getAttrs;
    if (!$start.node(-1).canReplaceWith($start.index(-1), $start.indexAfter(-1), nodeType)) { return null }
    return state.tr
      .delete(start, end)
      .setBlockType(start, start, nodeType, attrs)
  })
}

exports.InputRule = InputRule;
exports.closeDoubleQuote = closeDoubleQuote;
exports.closeSingleQuote = closeSingleQuote;
exports.ellipsis = ellipsis;
exports.emDash = emDash;
exports.inputRules = inputRules;
exports.openDoubleQuote = openDoubleQuote;
exports.openSingleQuote = openSingleQuote;
exports.smartQuotes = smartQuotes;
exports.textblockTypeInputRule = textblockTypeInputRule;
exports.undoInputRule = undoInputRule;
exports.wrappingInputRule = wrappingInputRule;
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