"use strict";
var cache;
var $ = require("jquery");
cache = {};
exports.get_text_height = function (font) {
    var block, body, div, result, text;
    if (cache[font] != null) {
        return cache[font];
    }
    text = $('<span>Hg</span>').css({
        font: font
    });
    block = $('<div style="display: inline-block; width: 1px; height: 0px;"> </div>');
    div = $('<div></div>');
    div.append(text, block);
    body = $('body');
    body.append(div);
    try {
        result = {};
        block.css({
            verticalAlign: 'baseline'
        });
        result.ascent = block.offset().top - text.offset().top;
        block.css({
            verticalAlign: 'bottom'
        });
        result.height = block.offset().top - text.offset().top;
        result.descent = result.height - result.ascent;
    }
    finally {
        div.remove();
    }
    cache[font] = result;
    return result;
};
