// Non-matching words
var excludeWords = ["a","an","and","for","or","as","at", "of"];

/*
Choose between:
eeCaseLowerCase
eeCaseUpperCase
eeCaseCapitalize
*/
var convertTo = eeCaseCapitalize;

function coords() {
    return {
    x: document.selection.GetActivePointX(eePosLogical),
    y: document.selection.GetActivePointY(eePosLogical)
    };
}
function contains(arr,str) {
    for (var i = 0; i < arr.length; i++) {
        if (arr[i] == str)
            return true;
    }
    return false;
}
var matchNonwhitespace = new RegExp("\\S");

var left = {
    x: document.selection.GetTopPointX(eePosLogical),
    y: document.selection.GetTopPointY(eePosLogical)
};
var selected = {
    x: document.selection.GetBottomPointX(eePosLogical),
    y: document.selection.GetBottomPointY(eePosLogical)
};

if (left.x > 1) {
    document.selection.SetActivePoint(eePosLogical, left.x, left.y);
    document.selection.SetActivePoint(eePosLogical, left.x-1, left.y, true);
    if (document.selection.Text != " ") {
        document.selection.WordRight();
        left = coords();
    }
}

while (left.y < selected.y || left.x < selected.x) {
    document.selection.SetActivePoint(eePosLogical, left.x, left.y);

    document.selection.WordRight(true);
    var right = coords();

    if (matchNonwhitespace.test(document.selection.Text)) {
        if (document.selection.Text.slice(-1) == " ") {
            right = coords();
            document.selection.SetActivePoint(eePosLogical, left.x,left.y);
            document.selection.SetActivePoint(eePosLogical, right.x-1,right.y,true);
        }

        if (!contains(excludeWords, document.selection.Text))
            document.selection.ChangeCase( convertTo );
    }

    left = right;
}