PScript in the browser

A 2021 school compiler brought to the web. You write in a made-up language and C comes out: the same journey a real compiler makes — lexical, syntactic, semantic and code generation — on a page you can poke at.

The language, on one screen

programa            el programa empieza aquí
ent  @x;            entero        dec @y;  decimal      cart @c;  carácter
@x = 3 + 4 * 2;     asignación, con la precedencia de siempre
lec @x;             leer          imp @x;               imprimir

si @x > 10 inicio
  imp @x;
fin sino inicio
  imp 0;
fin endif

mientras @x > 0 hacer
inicio
  @x = @x - 1;
fin

The original is Java with JavaFX and uses an LR parser with hand-built tables; it translates to C and interprets nothing. This version rewrites the parser as recursive descent — same grammar, but readable — and adds an interpreter that didn't exist: without it you'd have to download the C and compile it just to see whether a program does what you thought.

The Java original, on GitHub ↗