exec with tagged template literals

exec-with-tagged-template-literals.js

// TODO also support quoting?

function execTmpl(tmpl: TemplateStringsArray, ...rest: Array<string | Array<string>>) {
    const delim = {};
    const acc = [];
    for(let i = 0; i < tmpl.length; i++) {
        if(tmpl[i].length !== 0) {
            const bits = tmpl[i].split(/ +/);
            for(let j = 0; j < bits.length; j++) {
                // whitespace becomes a delim
                if(j) {
                    acc.push(delim);
                }
                acc.push(bits[j]);
            }
        }
        if(rest.length > i) {
            const bits = makeArray(rest[i]);
            // append contents of interpolated item
            for(let j = 0; j < bits.length; j++) {
                // whitespace becomes a delim
                if(j) {
                    acc.push(delim);
                }
                acc.push(bits[j]);
            }
        }
    }
    const args = [];
    for(const item of acc) {
        if(item === delim) {
            acc.push('');
        } else {
            acc[acc.length - 1] = acc[acc.length - 1] + item;
        }
    }
    return args;
}