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/*
* Copyright (c) 2026 Nakidai Perumenei <nakidai at disroot dot org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "thac.h"
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
long
findvar(char *name, struct scope **scope)
{
struct var *var;
ulong i;
for (; *scope; *scope = (*scope)->parent) for (i = 0; i < (*scope)->len; ++i)
{
var = &(*scope)->vars[i];
if (!strcmp(var->name, name))
return i;
}
return -1;
}
ulong
assignvar(char *name, struct val val, struct scope **scope)
{
struct scope *lscope;
long i;
lscope = *scope;
i = findvar(name, &lscope);
if (i < 0)
{
/* TODO: add cap and increment like in lex.c */
(*scope)->vars = realloc(
(*scope)->vars,
sizeof(*(*scope)->vars) * ++(*scope)->len
);
if (!(*scope)->vars)
dieno(1, "realloc()");
i = (*scope)->len - 1;
} else
{
scope = &lscope;
}
(*scope)->vars[i].name = name;
(*scope)->vars[i].val = val;
return i;
}
int
varnextchar(struct scope *scope)
{
struct var *var;
ulong i;
int c;
for (c = -1; scope; scope = scope->parent) for (i = 0; i < scope->len; ++i)
{
var = &scope->vars[i];
if (var->name[0] == '@' && islower(var->name[1]))
c = max(c, var->name[1]);
if (c == -1)
continue;
if (c == 'z')
return -1;
return var->name[1] + 1;
}
return 'a';
}
ulong
varnextnum(struct scope *scope)
{
struct var *var;
ulong i;
for (; scope; scope = scope->parent) for (i = 0; i < scope->len; ++i)
{
var = &scope->vars[i];
if (var->name[0] == '@' && isdigit(var->name[1]))
return atoll(&var->name[1]) + 1;
}
return 0;
}
void
delvarscope(struct scope *scope, ulong i)
{
freeval(scope->vars[i].val);
scope->vars[i] = scope->vars[--scope->len];
}
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