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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 Pos = CodeMirror.Pos;
  function cmp(a, b) { return a.line - b.line || a.ch - b.ch; }

var nameStartChar = "A-Z_a-z\\u00C0-\\u00D6\\u00D8-\\u00F6\\u00F8-\\u02FF\\u0370-\\u037D\\u037F-\\u1FFF\\u200C-\\u200D\\u2070-\\u218F\\u2C00-\\u2FEF\\u3001-\\uD7FF\\uF900-\\uFDCF\\uFDF0-\\uFFFD";
  var nameChar = nameStartChar + "\-\:\.0-9\\u00B7\\u0300-\\u036F\\u203F-\\u2040";
  var xmlTagStart = new RegExp("<(/?)([" + nameStartChar + "][" + nameChar + "]*)", "g");

function Iter(cm, line, ch, range) {
    this.line = line; this.ch = ch;
    this.cm = cm; this.text = cm.getLine(line);
    this.min = range ? Math.max(range.from, cm.firstLine()) : cm.firstLine();
    this.max = range ? Math.min(range.to - 1, cm.lastLine()) : cm.lastLine();
  }

function tagAt(iter, ch) {
    var type = iter.cm.getTokenTypeAt(Pos(iter.line, ch));
    return type && /\btag\b/.test(type);
  }

function nextLine(iter) {
    if (iter.line >= iter.max) return;
    iter.ch = 0;
    iter.text = iter.cm.getLine(++iter.line);
    return true;
  }
  function prevLine(iter) {
    if (iter.line <= iter.min) return;
    iter.text = iter.cm.getLine(--iter.line);
    iter.ch = iter.text.length;
    return true;
  }

CodeMirror.registerHelper("fold", "xml", function(cm, start) {
    var iter = new Iter(cm, start.line, 0);
    for (;;) {
      var openTag = toNextTag(iter)
      if (!openTag || iter.line != start.line) return
      var end = toTagEnd(iter)
      if (!end) return
      if (!openTag[1] && end != "selfClose") {
        var startPos = Pos(iter.line, iter.ch);
        var endPos = findMatchingClose(iter, openTag[2]);
        return endPos && cmp(endPos.from, startPos) > 0 ? {from: startPos, to: endPos.from} : null
      }
    }
  });
  CodeMirror.findMatchingTag = function(cm, pos, range) {
    var iter = new Iter(cm, pos.line, pos.ch, range);
    if (iter.text.indexOf(">") == -1 && iter.text.indexOf("<") == -1) return;
    var end = toTagEnd(iter), to = end && Pos(iter.line, iter.ch);
    var start = end && toTagStart(iter);
    if (!end || !start || cmp(iter, pos) > 0) return;
    var here = {from: Pos(iter.line, iter.ch), to: to, tag: start[2]};
    if (end == "selfClose") return {open: here, close: null, at: "open"};

if (start[1]) { // closing tag
      return {open: findMatchingOpen(iter, start[2]), close: here, at: "close"};
    } else { // opening tag
      iter = new Iter(cm, to.line, to.ch, range);
      return {open: here, close: findMatchingClose(iter, start[2]), at: "open"};
    }
  };

CodeMirror.findEnclosingTag = function(cm, pos, range, tag) {
    var iter = new Iter(cm, pos.line, pos.ch, range);
    for (;;) {
      var open = findMatchingOpen(iter, tag);
      if (!open) break;
      var forward = new Iter(cm, pos.line, pos.ch, range);
      var close = findMatchingClose(forward, open.tag);
      if (close) return {open: open, close: close};
    }
  };

// Used by addon/edit/closetag.js
  CodeMirror.scanForClosingTag = function(cm, pos, name, end) {
    var iter = new Iter(cm, pos.line, pos.ch, end ? {from: 0, to: end} : null);
    return findMatchingClose(iter, name);
  };
});