Function expect

docs/app/js/sanddance-app.js:144096–144099

(value)

} // Expect the next token to match the specified punctuator.
// If not, an exception will be thrown.
function expect(value) {
    const token = lex();
    if (token.type !== TokenPunctuator || token.value !== value) throwUnexpected(token);
} // Return true if the next token matches the specified punctuator.
function match(value) {
    return lookahead.type === TokenPunctuator && lookahead.value === value;
} // Return true if the next token matches the specified keyword