Function clipPos

mini-code-edit/cm/lib/codemirror.js:1240–1247

(pos)

    function clipLine(n) {return Math.max(0, Math.min(n, doc.size-1));}
    function clipPos(pos) {
      if (pos.line < 0) return {line: 0, ch: 0};
      if (pos.line >= doc.size) return {line: doc.size-1, ch: getLine(doc.size-1).text.length};
      var ch = pos.ch, linelen = getLine(pos.line).text.length;
      if (ch == null || ch > linelen) return {line: pos.line, ch: linelen};
      else if (ch < 0) return {line: pos.line, ch: 0};
      else return pos;
    }

    function findPosH(dir, unit) {
      var end = sel.inverted ? sel.from : sel.to, line = end.line, ch = end.ch;