Function SearchCursor

static/mergely/lib/searchcursor.js:4–83

(cm, query, pos, caseFold)

  var Pos = CodeMirror.Pos;

  function SearchCursor(cm, query, pos, caseFold) {
    this.atOccurrence = false; this.cm = cm;
    if (caseFold == null && typeof query == "string") caseFold = false;

    pos = pos ? cm.clipPos(pos) : Pos(0, 0);
    this.pos = {from: pos, to: pos};

    // The matches method is filled in based on the type of query.
    // It takes a position and a direction, and returns an object
    // describing the next occurrence of the query, or null if no
    // more matches were found.
    if (typeof query != "string") { // Regexp match
      if (!query.global) query = new RegExp(query.source, query.ignoreCase ? "ig" : "g");
      this.matches = function(reverse, pos) {
        if (reverse) {
          query.lastIndex = 0;
          var line = cm.getLine(pos.line).slice(0, pos.ch), match = query.exec(line), start = 0;
          while (match) {
            start += match.index + 1;
            line = line.slice(start);
            query.lastIndex = 0;
            var newmatch = query.exec(line);
            if (newmatch) match = newmatch;
            else break;
          }
          start--;
        } else {
          query.lastIndex = pos.ch;
          var line = cm.getLine(pos.line), match = query.exec(line),
          start = match && match.index;
        }
        if (match && match[0])
          return {from: Pos(pos.line, start),
                  to: Pos(pos.line, start + match[0].length),
                  match: match};
      };
    } else { // String query
      if (caseFold) query = query.toLowerCase();
      var fold = caseFold ? function(str){return str.toLowerCase();} : function(str){return str;};
      var target = query.split("\n");
      // Different methods for single-line and multi-line queries
      if (target.length == 1) {
        if (!query.length) {
          // Empty string would match anything and never progress, so
          // we define it to match nothing instead.
          this.matches = function() {};
        } else {
          this.matches = function(reverse, pos) {
            var line = fold(cm.getLine(pos.line)), len = query.length, match;
            if (reverse ? (pos.ch >= len && (match = line.lastIndexOf(query, pos.ch - len)) != -1)
                        : (match = line.indexOf(query, pos.ch)) != -1)
              return {from: Pos(pos.line, match),
                      to: Pos(pos.line, match + len)};
          };
        }
      } else {
        this.matches = function(reverse, pos) {
          var ln = pos.line, idx = (reverse ? target.length - 1 : 0), match = target[idx], line = fold(cm.getLine(ln));