katex/src/Options.js

/**
 * This file contains information about the options that the Parser carries
 * around with it while parsing. Data is held in an `Options` object, and when
 * recursing, a new `Options` object can be created with the `.with*` and
 * `.reset` functions.
 */

/**
 * This is the main options class. It contains the style, size, color, and font
 * of the current parse level. It also contains the style and size of the parent
 * parse level, so size changes can be handled efficiently.
 *
 * Each of the `.with*` and `.reset` functions passes its current style and size
 * as the parentStyle and parentSize of the new options class, so parent
 * handling is taken care of automatically.
 */
function Options(data) {
    this.style = data.style;
    this.color = data.color;
    this.size = data.size;
    this.phantom = data.phantom;
    this.font = data.font;

    if (data.parentStyle === undefined) {
        this.parentStyle = data.style;
    } else {
        this.parentStyle = data.parentStyle;
    }

    if (data.parentSize === undefined) {
        this.parentSize = data.size;
    } else {
        this.parentSize = data.parentSize;
    }
}

/**
 * Returns a new options object with the same properties as "this".  Properties
 * from "extension" will be copied to the new options object.
 */
Options.prototype.extend = function(extension) {
    var data = {
        style: this.style,
        size: this.size,
        color: this.color,
        parentStyle: this.style,
        parentSize: this.size,
        phantom: this.phantom,
        font: this.font,
    };

    for (var key in extension) {
        if (extension.hasOwnProperty(key)) {
            data[key] = extension[key];
        }
    }

    return new Options(data);
};

/**
 * Create a new options object with the given style.
 */
Options.prototype.withStyle = function(style) {
    return this.extend({
        style: style,
    });
};

/**
 * Create a new options object with the given size.
 */
Options.prototype.withSize = function(size) {
    return this.extend({
        size: size,
    });
};

/**
 * Create a new options object with the given color.
 */
Options.prototype.withColor = function(color) {
    return this.extend({
        color: color,
    });
};

/**
 * Create a new options object with "phantom" set to true.
 */
Options.prototype.withPhantom = function() {
    return this.extend({
        phantom: true,
    });
};

/**
 * Create a new options objects with the give font.
 */
Options.prototype.withFont = function(font) {
    return this.extend({
        font: font,
    });
};

/**
 * Create a new options object with the same style, size, and color. This is
 * used so that parent style and size changes are handled correctly.
 */
Options.prototype.reset = function() {
    return this.extend({});
};

/**
 * A map of color names to CSS colors.
 * TODO(emily): Remove this when we have real macros
 */
var colorMap = {
    "katex-blue": "#6495ed",
    "katex-orange": "#ffa500",
    "katex-pink": "#ff00af",
    "katex-red": "#df0030",
    "katex-green": "#28ae7b",
    "katex-gray": "gray",
    "katex-purple": "#9d38bd",
    "katex-blueA": "#c7e9f1",
    "katex-blueB": "#9cdceb",
    "katex-blueC": "#58c4dd",
    "katex-blueD": "#29abca",
    "katex-blueE": "#1c758a",
    "katex-tealA": "#acead7",
    "katex-tealB": "#76ddc0",
    "katex-tealC": "#5cd0b3",
    "katex-tealD": "#55c1a7",
    "katex-tealE": "#49a88f",
    "katex-greenA": "#c9e2ae",
    "katex-greenB": "#a6cf8c",
    "katex-greenC": "#83c167",
    "katex-greenD": "#77b05d",
    "katex-greenE": "#699c52",
    "katex-goldA": "#f7c797",
    "katex-goldB": "#f9b775",
    "katex-goldC": "#f0ac5f",
    "katex-goldD": "#e1a158",
    "katex-goldE": "#c78d46",
    "katex-redA": "#f7a1a3",
    "katex-redB": "#ff8080",
    "katex-redC": "#fc6255",
    "katex-redD": "#e65a4c",
    "katex-redE": "#cf5044",
    "katex-maroonA": "#ecabc1",
    "katex-maroonB": "#ec92ab",
    "katex-maroonC": "#c55f73",
    "katex-maroonD": "#a24d61",
    "katex-maroonE": "#94424f",
    "katex-purpleA": "#caa3e8",
    "katex-purpleB": "#b189c6",
    "katex-purpleC": "#9a72ac",
    "katex-purpleD": "#715582",
    "katex-purpleE": "#644172",
    "katex-mintA": "#f5f9e8",
    "katex-mintB": "#edf2df",
    "katex-mintC": "#e0e5cc",
    "katex-grayA": "#fdfdfd",
    "katex-grayB": "#f7f7f7",
    "katex-grayC": "#eeeeee",
    "katex-grayD": "#dddddd",
    "katex-grayE": "#cccccc",
    "katex-grayF": "#aaaaaa",
    "katex-grayG": "#999999",
    "katex-grayH": "#555555",
    "katex-grayI": "#333333",
    "katex-kaBlue": "#314453",
    "katex-kaGreen": "#639b24",
};

/**
 * Gets the CSS color of the current options object, accounting for the
 * `colorMap`.
 */
Options.prototype.getColor = function() {
    if (this.phantom) {
        return "transparent";
    } else {
        return colorMap[this.color] || this.color;
    }
};

module.exports = Options;