Function getVariant

src/buildMathML.ts:74–137

(
    group: SymbolParseNode,
    options: Options,
)

 * Returns the math variant as a string or null if none is required.
 */
export const getVariant = (
    group: SymbolParseNode,
    options: Options,
): FontVariant | null | undefined => {
    // Handle \text... font specifiers as best we can.
    // MathML has a limited list of allowable mathvariant specifiers; see
    // https://www.w3.org/TR/MathML3/chapter3.html#presm.commatt
    if (group.mode === "text") {
        if (options.fontFamily === "texttt") {
            return "monospace";
        } else if (options.fontFamily === "textsf") {
            if (options.fontShape === "textit" &&
                options.fontWeight === "textbf") {
                return "sans-serif-bold-italic";
            } else if (options.fontShape === "textit") {
                return "sans-serif-italic";
            } else if (options.fontWeight === "textbf") {
                return "bold-sans-serif";
            } else {
                return "sans-serif";
            }
        } else if (options.fontShape === "textit" &&
                   options.fontWeight === "textbf") {
            return "bold-italic";
        } else if (options.fontShape === "textit") {
            return "italic";
        } else if (options.fontWeight === "textbf") {
            return "bold";
        }
    }

    const font = options.font;
    if (!font || font === "mathnormal") {
        return null;
    }

    const mode = group.mode;
    const mathVariant = mathFontVariants[font];

    if (mathVariant) {
        return typeof mathVariant === "function"
            ? mathVariant(group)
            : mathVariant;
    }

    let text = group.text;
    if (noVariantSymbols.has(text)) {
        return null;
    }

    if (symbols[mode][text]) {
        const replacement = symbols[mode][text].replace;
        if (replacement) {
            text = replacement;
        }
    }

    const fontName = fontMap[font].fontName;