html.js

export default function html(literalSections, ...substs) {
    // Use raw literal sections: we don’t want
    // backslashes (\n etc.) to be interpreted
    let raw = literalSections.split("\\");
    let result = '';

    substs.forEach((subst, i) => {
    //     // Retrieve the literal section preceding
    //     // the current substitution
        let lit = raw[i];

    //     // In the example, map() returns an array:
    //     // If substitution is an array (and not a string),
    //     // we turn it into a string
        if (Array.isArray(subst)) {
            subst = subst.join('');
        }

    //     // If the substitution is preceded by a dollar sign,
    //     // we escape special characters in it
        if (lit.endsWith('$')) {
            subst = $tmpl.html_escape(subst);
            lit = lit.slice(0, -1);
        }
        result += lit;
        result += subst;
    });
    // Take care of last literal section
    // (Never fails, because an empty template string
    // produces one literal section, an empty string)
    result += raw[raw.length-1]; // (A)

    return result;    
} ;