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#include <errno.h>
#include <assert.h>
#include <stdbool.h>
#include <string.h>
#include <stdio.h>
#include <limits.h>
#include <stdlib.h>
#include <lyn/lyn.h>
#include <lyn/ast.h>
#include <lyn/parser.h>
#include <lyn/debug.h>
static int eval_group(struct lyn *lyn, struct lyn_value value)
{
fprintf(lyn->output, "(begin");
lyn->depth++;
foreach_vec(gi, value.args) {
fprintf(lyn->output, "\n%*s(", 2 * lyn->depth, " ");
struct lyn_value arg = lyn_at(value.args, gi);
if (lyn_eval(lyn, arg))
return -1;
fprintf(lyn->output, ")");
}
fprintf(lyn->output, "\n%*s)", 2 * lyn->depth, " ");
lyn->depth--;
return 0;
}
static int eval_apply(struct lyn *lyn, struct lyn_value value)
{
fprintf(lyn->output, "(");
foreach_vec(ai, value.args) {
struct lyn_value arg = lyn_at(value.args, ai);
if (lyn_eval(lyn, arg))
return -1;
}
fprintf(lyn->output, ")");
return 0;
}
static int eval_cmd(struct lyn *lyn, struct lyn_value value)
{
foreach_vec(ci, value.args) {
struct lyn_value arg = lyn_at(value.args, ci);
if (lyn_eval(lyn, arg))
return -1;
/* don't print a space after the last argument */
if (ci < vec_len(&value.args) - 1)
fprintf(lyn->output, " ");
}
return 0;
}
static int eval_str(struct lyn *lyn, struct lyn_value value)
{
fprintf(lyn->output, "%s", value.s);
return 0;
}
static int eval_int(struct lyn *lyn, struct lyn_value value)
{
fprintf(lyn->output, "%lld", value.i);
return 0;
}
static int eval_float(struct lyn *lyn, struct lyn_value value)
{
fprintf(lyn->output, "%f", value.d);
return 0;
}
static int eval_id(struct lyn *lyn, struct lyn_value value)
{
fprintf(lyn->output, "%s", value.s);
return 0;
}
int lyn_eval(struct lyn *lyn, struct lyn_value value)
{
switch (value.kind) {
case LYN_GROUP: return eval_group(lyn, value);
case LYN_APPLY: return eval_apply(lyn, value);
case LYN_FLOAT: return eval_float(lyn, value);
case LYN_STR: return eval_str(lyn, value);
case LYN_CMD: return eval_cmd(lyn, value);
case LYN_INT: return eval_int(lyn, value);
case LYN_ID: return eval_id(lyn, value);
default: error("unhandled case during 'eval'"); break;
}
return -1;
}
static void destroy_val(struct lyn_value value);
static void destroy_group(struct lyn_value value)
{
foreach_vec(gi, value.args) {
struct lyn_value arg = lyn_at(value.args, gi);
destroy_val(arg);
}
vec_destroy(&value.args);
}
static void destroy_apply(struct lyn_value value)
{
foreach_vec(ai, value.args) {
struct lyn_value arg = lyn_at(value.args, ai);
destroy_val(arg);
}
vec_destroy(&value.args);
}
static void destroy_cmd(struct lyn_value value)
{
foreach_vec(ci, value.args) {
struct lyn_value arg = lyn_at(value.args, ci);
destroy_val(arg);
}
vec_destroy(&value.args);
}
static void destroy_str(struct lyn_value value)
{
free(value.s);
}
static void destroy_id(struct lyn_value value)
{
free(value.s);
}
static void destroy_val(struct lyn_value value)
{
switch (value.kind) {
case LYN_GROUP: return destroy_group(value);
case LYN_APPLY: return destroy_apply(value);
case LYN_STR: return destroy_str(value);
case LYN_CMD: return destroy_cmd(value);
case LYN_ID: return destroy_id(value);
case LYN_INT: return; /* nothing to do */
default: error("unhandled case during 'destroy'"); break;
}
}
int lyn_eval_str(struct lyn *lyn, const char *name, const char *str)
{
struct parser *p = create_parser();
if (!p)
return -1;
parse(p, name, str);
struct lyn_value ast = p->tree;
bool failed = p->failed;
destroy_parser(p);
if (failed)
return -1;
ast_dump(0, ast);
lyn->output = fopen("/tmp/output.scm", "w");
if (!lyn->output) {
error("failed opening output file\n");
return -1;
}
fprintf(lyn->output, "(define-syntax-rule (expand expr) expr)\n");
fprintf(lyn->output, "(define (get expr) expr)\n");
int ret = 0;
foreach_vec(ii, ast.args) {
fprintf(lyn->output, "(");
struct lyn_value v = lyn_at(ast.args, ii);
if ((ret = lyn_eval(lyn, v)))
break;
fprintf(lyn->output, ")\n");
}
fclose(lyn->output);
destroy_val(ast);
if (ret)
return ret;
return system("guile /tmp/output.scm");
}
/**
* Read whole file into a buffer and return pointer to buffer.
* Possibly kind of silly to have both \p file and \p f.
* Apparently there's no standardized way to get the file name of a
* file pointer.
*
* @param file Name of file to read.
* @param f File pointer.
* @return Pointer to buffer with file contents.
*/
static char *read_file(const char *file, FILE *f)
{
fseek(f, 0, SEEK_END);
/** @todo check how well standardized this actually is */
long s = ftell(f);
if (s == LONG_MAX) {
error("%s might be a directory", file);
return NULL;
}
fseek(f, 0, SEEK_SET);
char *buf = malloc((size_t)(s + 1));
if (!buf)
return NULL;
fread(buf, (size_t)(s + 1), 1, f);
/* remember terminating null */
buf[s] = 0;
return buf;
}
int lyn_eval_file(struct lyn *lyn, const char *fname)
{
FILE *f = fopen(fname, "rb");
if (!f) {
error("failed opening %s: %s\n", fname, strerror(errno));
return -1;
}
char *buf = read_file(fname, f);
fclose(f);
if (!buf)
return -1;
int ret = lyn_eval_str(lyn, fname, buf);
free(buf);
return ret;
}
struct lyn lyn_create()
{
return (struct lyn){};
}
void lyn_destroy(struct lyn *lyn)
{
(void)lyn;
}
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