I'm creating a C++ parser with PEG.js, and I need to be able to use cin. With the after-match JS, when I use prompt(), the (alternate) online version throws an error of 'Parse Error: prompt is not defined'. I am trying to use the initializer to create a function to replicate prompt (probably not optimized, I was just trying it as a solution). However, when I do this, it still gives me the error. I have tried using window.prompt as well, but again, it does not work. Here's an example of what I'm doing:
{
function cin() {
window.prompt("");
}
function changeVar(variable, newValue) {
if(typeof variable === typeof newValue) {
variable = newValue;
} else if(typeof variable === 'undefined') {
alert("You can't assign a value to a variable if the variable isn't declared yet!");
} else {
alert("Bad assignment. In C++, a variable *must* have the same type *all the time*.");
}
}
}
stdin =
whitespace* "std::cin" whitespace* ">>" whitespace* varToBeChanged:[a-zA-Z_]+ ";" whitespace*
{ changeVar(varToBeChanged, cin('')); return varToBeChanged; }
whitespace =
space:[ \t]
{ return space; }
and then in the parser testing field:
std::cin >> variable;
Thank you for looking. I have tried Googling this and SO-searching this but I haven't found any results.
Also, here is the main piece of code, for all the (current) extra information anyone needs. I am having some problems with this as well, but I'll try to figure them out on my own before I post another question.
