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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
  "use strict";

var listRE = /^(\s*)(>[> ]*|[*+-] \[[x ]\]\s|[*+-]\s|(\d+)([.)]))(\s*)/,
      emptyListRE = /^(\s*)(>[> ]*|[*+-] \[[x ]\]|[*+-]|(\d+)[.)])(\s*)$/,
      unorderedListRE = /[*+-]\s/;

CodeMirror.commands.newlineAndIndentContinueMarkdownList = function(cm) {
    if (cm.getOption("disableInput")) return CodeMirror.Pass;
    var ranges = cm.listSelections(), replacements = [];
    for (var i = 0; i < ranges.length; i++) {
      var pos = ranges[i].head;

// If we're not in Markdown mode, fall back to normal newlineAndIndent
      var eolState = cm.getStateAfter(pos.line);
      var inner = CodeMirror.innerMode(cm.getMode(), eolState);
      if (inner.mode.name !== "markdown") {
        cm.execCommand("newlineAndIndent");
        return;
      } else {
        eolState = inner.state;
      }

var inList = eolState.list !== false;
      var inQuote = eolState.quote !== 0;

if (numbered) incrementRemainingMarkdownListNumbers(cm, pos);
      }
    }

cm.replaceSelections(replacements);
  };

// Auto-updating Markdown list numbers when a new item is added to the
  // middle of a list
  function incrementRemainingMarkdownListNumbers(cm, pos) {
    var startLine = pos.line, lookAhead = 0, skipCount = 0;
    var startItem = listRE.exec(cm.getLine(startLine)), startIndent = startItem[1];

do {
      lookAhead += 1;
      var nextLineNumber = startLine + lookAhead;
      var nextLine = cm.getLine(nextLineNumber), nextItem = listRE.exec(nextLine);

if (nextItem) {
        var nextIndent = nextItem[1];
        var newNumber = (parseInt(startItem[3], 10) + lookAhead - skipCount);
        var nextNumber = (parseInt(nextItem[3], 10)), itemNumber = nextNumber;

if (startIndent === nextIndent && !isNaN(nextNumber)) {
          if (newNumber === nextNumber) itemNumber = nextNumber + 1;
          if (newNumber > nextNumber) itemNumber = newNumber + 1;
          cm.replaceRange(
            nextLine.replace(listRE, nextIndent + itemNumber + nextItem[4] + nextItem[5]),
          {
            line: nextLineNumber, ch: 0
          }, {
            line: nextLineNumber, ch: nextLine.length
          });
        } else {
          if (startIndent.length > nextIndent.length) return;
          // This doesn't run if the next line immediately indents, as it is
          // not clear of the users intention (new indented item or same level)
          if ((startIndent.length < nextIndent.length) && (lookAhead === 1)) return;
          skipCount += 1;
        }
      }
    } while (nextItem);
  }
});