shithub: lpa

ref: ad872eeb19b4fcc41a5d34750ca6cdcf88a39795
dir: /aplan.c/

#include <u.h>
#include <libc.h>
#include <thread.h>

#include "dat.h"
#include "fns.h"

Array *
parseaplan(TokenList *tokens, char **errp)
{
	/* TODO: write a recursive descent parser for APLAN here. */
	Array *val;

	int ok = 1;
	for(uvlong i = 0; i < tokens->count; i++)
		ok &= tokens->tokens[i].tag == TokNumber;
	if(!ok){
		*errp = "can only parse simple constants";
		return nil;
	}

	if(tokens->count == 1){
		val = allocarray(TypeNumber, 0, 1);
		setint(val, 0, tokens->tokens[0].num);
	}else{
		val = allocarray(TypeNumber, 1, tokens->count);
		setshape(val, 0, tokens->count);
		for(uvlong i = 0; i < tokens->count; i++)
			setint(val, i, tokens->tokens[i].num);
	}
	return val;
}