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Basic configuration for the CodeMirror code editor
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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/5/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 matches(hint, typed, matchInMiddle) {
    if (matchInMiddle) return hint.indexOf(typed) >= 0;
    else return hint.lastIndexOf(typed, 0) == 0;
  }

  function getHints(cm, options) {
    var tags = options && options.schemaInfo;
    var quote = (options && options.quoteChar) || '"';
    var matchInMiddle = options && options.matchInMiddle;
    if (!tags) return;
    var cur = cm.getCursor(), token = cm.getTokenAt(cur);
    if (token.end > cur.ch) {
      token.end = cur.ch;
      token.string = token.string.slice(0, cur.ch - token.start);
    }
    var inner = CodeMirror.innerMode(cm.getMode(), token.state);
    if (!inner.mode.xmlCurrentTag) return
    var result = [], replaceToken = false, prefix;
    var tag = /\btag\b/.test(token.type) && !/>$/.test(token.string);
    var tagName = tag && /^\w/.test(token.string), tagStart;

    if (tagName) {
      var before = cm.getLine(cur.line).slice(Math.max(0, token.start - 2), token.start);
      var tagType = /<\/$/.test(before) ? "close" : /<$/.test(before) ? "open" : null;
      if (tagType) tagStart = token.start - (tagType == "close" ? 2 : 1);
    } else if (tag && token.string == "<") {
      tagType = "open";
    } else if (tag && token.string == "");
    } else {
      // Attribute completion
      var curTag = tagInfo && tags[tagInfo.name], attrs = curTag && curTag.attrs;
      var globalAttrs = tags["!attrs"];
      if (!attrs && !globalAttrs) return;
      if (!attrs) {
        attrs = globalAttrs;
      } else if (globalAttrs) { // Combine tag-local and global attributes
        var set = {};
        for (var nm in globalAttrs) if (globalAttrs.hasOwnProperty(nm)) set[nm] = globalAttrs[nm];
        for (var nm in attrs) if (attrs.hasOwnProperty(nm)) set[nm] = attrs[nm];
        attrs = set;
      }
      if (token.type == "string" || token.string == "=") { // A value
        var before = cm.getRange(Pos(cur.line, Math.max(0, cur.ch - 60)),
                                 Pos(cur.line, token.type == "string" ? token.start : token.end));
        var atName = before.match(/([^\s\u00a0=<>\"\']+)=$/), atValues;
        if (!atName || !attrs.hasOwnProperty(atName[1]) || !(atValues = attrs[atName[1]])) return;
        if (typeof atValues == 'function') atValues = atValues.call(this, cm); // Functions can be used to supply values for autocomplete widget
        if (token.type == "string") {
          prefix = token.string;
          var n = 0;
          if (/['"]/.test(token.string.charAt(0))) {
            quote = token.string.charAt(0);
            prefix = token.string.slice(1);
            n++;
          }
          var len = token.string.length;
          if (/['"]/.test(token.string.charAt(len - 1))) {
            quote = token.string.charAt(len - 1);
            prefix = token.string.substr(n, len - 2);
          }
          if (n) { // an opening quote
            var line = cm.getLine(cur.line);
            if (line.length > token.end && line.charAt(token.end) == quote) token.end++; // include a closing quote
          }
          replaceToken = true;
        }
        var returnHintsFromAtValues = function(atValues) {
          if (atValues)
            for (var i = 0; i < atValues.length; ++i) if (!prefix || matches(atValues[i], prefix, matchInMiddle))
              result.push(quote + atValues[i] + quote);
          return returnHints();
        };
        if (atValues && atValues.then) return atValues.then(returnHintsFromAtValues);
        return returnHintsFromAtValues(atValues);
      } else { // An attribute name
        if (token.type == "attribute") {
          prefix = token.string;
          replaceToken = true;
        }
        for (var attr in attrs) if (attrs.hasOwnProperty(attr) && (!prefix || matches(attr, prefix, matchInMiddle)))
          result.push(attr);
      }
    }
    function returnHints() {
      return {
        list: result,
        from: replaceToken ? Pos(cur.line, tagStart == null ? token.start : tagStart) : cur,
        to: replaceToken ? Pos(cur.line, token.end) : cur
      };
    }
    return returnHints();
  }

  CodeMirror.registerHelper("hint", "xml", getHints);
});