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#include "sloth.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <xxhash.h>
SlothError sloth_init(Sloth *ctx)
{
SlothError err;
err = sloth_dict_append(ctx, SLOTH_DICT_C("+", sloth_add));
if (err != NULL) {
sloth_deinit(ctx);
return err;
}
err = sloth_dict_append(ctx, SLOTH_DICT_C(".", sloth_write));
if (err != NULL) {
sloth_deinit(ctx);
return err;
}
return NULL;
}
void sloth_deinit(Sloth *ctx)
{
if (ctx->stack != NULL) {
free(ctx->stack);
ctx->stack = NULL;
}
while (ctx->dict != NULL) {
SlothDict *const next = ctx->dict->next;
free(ctx->dict);
ctx->dict = next;
}
}
SlothError sloth_dict_append(Sloth *ctx, SlothDict dict)
{
SlothDict **dest;
if (ctx->dict == NULL)
dest = &ctx->dict;
else {
SlothDict *last = ctx->dict;
while (last->next != NULL)
last = last->next;
dest = &last->next;
}
*dest = malloc(sizeof(SlothDict));
if (*dest == NULL)
return "sloth_dict_append: malloc failed";
memcpy(*dest, &dict, sizeof(SlothDict));
return NULL;
}
SlothError sloth_exec(Sloth *ctx, const char *s)
{
const SlothHash hash = XXH32(s, strlen(s), 0);
for (SlothDict *dict = ctx->dict; dict != NULL; dict = dict->next)
if (dict->hash == hash) {
const SlothError err = dict->func(ctx);
if (err != NULL)
return err;
}
return "sloth_exec: unrecognized token";
}
SlothError sloth_exec_line(Sloth *ctx, char *s)
{
static const char *sep = "\t\n\v\f\r ";
for (char *tok = strtok(s, sep); tok != NULL; tok = strtok(NULL, sep)) {
const SlothError err = sloth_exec(ctx, tok);
if (err != NULL)
return err;
}
return NULL;
}
SlothError sloth_pop(Sloth *ctx, SlothByte *v)
{
if (ctx->stack_size == 0)
return "sloth_pull: stack is empty";
*v = ctx->stack[ctx->stack_size - 1];
ctx->stack_size -= 1;
return NULL;
}
SlothError sloth_push(Sloth *ctx, SlothByte v)
{
if (ctx->stack == NULL) {
ctx->stack = malloc(sizeof(SlothByte) * 16);
if (ctx->stack == NULL)
return "sloth_push: calloc failed";
ctx->stack_capacity = 16;
} else if (ctx->stack_size == ctx->stack_capacity) {
SlothByte *const new_stack =
realloc(ctx->stack, ctx->stack_capacity * 2);
if (new_stack == NULL)
return "sloth_push: realloc failed";
ctx->stack_capacity *= 2;
}
ctx->stack[ctx->stack_size] = v;
ctx->stack_size += 1;
return NULL;
}
SlothError sloth_add(Sloth *ctx)
{
SlothError err;
SlothByte a, b;
err = sloth_pop(ctx, &a);
if (err != NULL)
return err;
err = sloth_pop(ctx, &b);
if (err != NULL)
return err;
a += b;
err = sloth_push(ctx, a);
if (err != NULL)
return err;
return NULL;
}
SlothError sloth_write(Sloth *ctx)
{
SlothError err;
SlothByte a;
err = sloth_pop(ctx, &a);
if (err != NULL)
return err;
printf("%c", (unsigned char)a);
return NULL;
}
void sloth_inspect_stack(const Sloth *ctx)
{
printf("<%lu> ", ctx->stack_size);
for (size_t i = 0; i < ctx->stack_size; i++)
printf("%d ", ctx->stack[i]);
}
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