glimt

glimt is what runs inside a page in utsikt. a page asks for it with <script type="text/x-glimt">, which makes its scripts and its onclick attributes glimt. the language is a small part of c0, so anyone who has written a moonshot program can already write one. the browser turns it into x86-64 machine code the first time it runs.

int clicks = 0;
void bump() {
    clicks += 1;
    set_text(by_id("count"), concat("clicked ", num(clicks)));
}

with that in a page, an element with onclick="bump();" counts its own clicks. every value is an int. there are functions, if and else, while and for with break and continue, return, and c0's operators. a page's scripts run top to bottom once when it loads, before its first frame.

what a page can reach

a script reaches the page through ten builtins and nothing else. it can find an element by its id, read and replace its text, change its class and read a few of its attributes. strings are built with num, concat, len and eq. elements and strings are handles, small numbers that index a table the page owns, not pointers, so a script cannot write anywhere in utsikt's memory.

the code glimt writes never faults. division by zero gives 0, a loop that runs too long or a function that runs out of stack is stopped with a line in the serial log, and the next script on the page runs as if nothing happened.