picrin/lib/string.c

681 lines
15 KiB
C

/**
* See Copyright Notice in picrin.h
*/
#include "picrin.h"
#include "picrin/extra.h"
#include "picrin/private/object.h"
struct rope {
int refcnt;
int weight;
bool isleaf;
union {
struct {
struct rope *owner;
const char *str; /* always points to zero-term'd buf */
} leaf;
struct {
struct rope *left, *right;
} node;
} u;
char buf[1];
};
struct rope *
pic_rope_incref(struct rope *rope) {
rope->refcnt++;
return rope;
}
void
pic_rope_decref(pic_state *pic, struct rope *rope) {
if (! --rope->refcnt) {
if (rope->isleaf) {
if (rope->u.leaf.owner) {
pic_rope_decref(pic, rope->u.leaf.owner);
}
} else {
pic_rope_decref(pic, rope->u.node.left);
pic_rope_decref(pic, rope->u.node.right);
}
pic_free(pic, rope);
}
}
static struct rope *
make_rope_leaf(pic_state *pic, const char *str, int len)
{
struct rope *rope;
rope = pic_malloc(pic, offsetof(struct rope, buf) + len + 1);
rope->refcnt = 1;
rope->weight = len;
rope->isleaf = true;
rope->u.leaf.owner = NULL;
rope->u.leaf.str = rope->buf;
rope->buf[len] = 0;
if (str) {
memcpy(rope->buf, str, len);
}
return rope;
}
static struct rope *
make_rope_lit(pic_state *pic, const char *str, int len)
{
struct rope *rope;
rope = pic_malloc(pic, offsetof(struct rope, buf));
rope->refcnt = 1;
rope->weight = len;
rope->isleaf = true;
rope->u.leaf.owner = NULL;
rope->u.leaf.str = str;
return rope;
}
static struct rope *
make_rope_slice(pic_state *pic, struct rope *owner, int i, int j)
{
struct rope *rope, *real_owner;
assert(owner->isleaf);
real_owner = owner->u.leaf.owner == NULL ? owner : owner->u.leaf.owner;
rope = pic_malloc(pic, offsetof(struct rope, buf));
rope->refcnt = 1;
rope->weight = j - i;
rope->isleaf = true;
rope->u.leaf.owner = real_owner;
rope->u.leaf.str = owner->u.leaf.str + i;
pic_rope_incref(real_owner);
return rope;
}
static struct rope *
make_rope_node(pic_state *pic, struct rope *left, struct rope *right)
{
struct rope *rope;
rope = pic_malloc(pic, sizeof(struct rope));
rope->refcnt = 1;
rope->weight = left->weight + right->weight;
rope->isleaf = false;
rope->u.node.left = pic_rope_incref(left);
rope->u.node.right = pic_rope_incref(right);
return rope;
}
static pic_value
make_str(pic_state *pic, struct rope *rope)
{
struct string *str;
str = (struct string *)pic_obj_alloc(pic, sizeof(struct string), PIC_TYPE_STRING);
str->rope = rope; /* delegate ownership */
return pic_obj_value(str);
}
static struct rope *
merge(pic_state *pic, struct rope *left, struct rope *right)
{
if (left == 0)
return pic_rope_incref(right);
if (right == 0)
return pic_rope_incref(left);
return make_rope_node(pic, left, right);
}
static struct rope *
slice(pic_state *pic, struct rope *rope, int i, int j)
{
int lweight;
if (i == 0 && rope->weight == j) {
return pic_rope_incref(rope);
}
if (rope->isleaf) {
return make_rope_slice(pic, rope, i, j);
}
lweight = rope->u.node.left->weight;
if (j <= lweight) {
return slice(pic, rope->u.node.left, i, j);
} else if (lweight <= i) {
return slice(pic, rope->u.node.right, i - lweight, j - lweight);
} else {
struct rope *r, *l;
l = slice(pic, rope->u.node.left, i, lweight);
r = slice(pic, rope->u.node.right, 0, j - lweight);
rope = merge(pic, l, r);
pic_rope_decref(pic, l);
pic_rope_decref(pic, r);
return rope;
}
}
static void
flatten(pic_state *pic, struct rope *rope, struct rope *owner, char *buf)
{
if (rope->isleaf) {
memcpy(buf, rope->u.leaf.str, rope->weight);
} else {
flatten(pic, rope->u.node.left, owner, buf);
flatten(pic, rope->u.node.right, owner, buf + rope->u.node.left->weight);
}
/* path compression */
if (! rope->isleaf) {
pic_rope_incref(owner);
pic_rope_decref(pic, rope->u.node.left);
pic_rope_decref(pic, rope->u.node.right);
rope->isleaf = true;
rope->u.leaf.owner = owner;
rope->u.leaf.str = buf;
}
}
static void
str_update(pic_state *pic, pic_value dst, pic_value src)
{
pic_rope_incref(pic_str_ptr(pic, src)->rope);
pic_rope_decref(pic, pic_str_ptr(pic, dst)->rope);
pic_str_ptr(pic, dst)->rope = pic_str_ptr(pic, src)->rope;
}
pic_value
pic_str_value(pic_state *pic, const char *str, int len)
{
struct rope *r;
if (len > 0) {
r = make_rope_leaf(pic, str, len);
} else {
if (len == 0) {
str = "";
}
r = make_rope_lit(pic, str, -len);
}
return make_str(pic, r);
}
pic_value
pic_strf_value(pic_state *pic, const char *fmt, ...)
{
va_list ap;
pic_value str;
va_start(ap, fmt);
str = pic_vstrf_value(pic, fmt, ap);
va_end(ap);
return str;
}
pic_value
pic_vstrf_value(pic_state *pic, const char *fmt, va_list ap)
{
pic_value str, port;
const char *buf;
int len;
port = pic_fmemopen(pic, NULL, 0, "w");
pic_vfprintf(pic, port, fmt, ap);
pic_fgetbuf(pic, port, &buf, &len);
str = pic_str_value(pic, buf, len);
pic_fclose(pic, port);
return str;
}
int
pic_str_len(pic_state *PIC_UNUSED(pic), pic_value str)
{
return pic_str_ptr(pic, str)->rope->weight;
}
char
pic_str_ref(pic_state *PIC_UNUSED(pic), pic_value str, int i)
{
struct rope *rope = pic_str_ptr(pic, str)->rope;
while (i < rope->weight) {
if (rope->isleaf) {
return rope->u.leaf.str[i];
}
if (i < rope->u.node.left->weight) {
rope = rope->u.node.left;
} else {
i -= rope->u.node.left->weight;
rope = rope->u.node.right;
}
}
PIC_UNREACHABLE();
}
pic_value
pic_str_cat(pic_state *pic, pic_value a, pic_value b)
{
return make_str(pic, merge(pic, pic_str_ptr(pic, a)->rope, pic_str_ptr(pic, b)->rope));
}
pic_value
pic_str_sub(pic_state *pic, pic_value str, int s, int e)
{
return make_str(pic, slice(pic, pic_str_ptr(pic, str)->rope, s, e));
}
int
pic_str_cmp(pic_state *pic, pic_value str1, pic_value str2)
{
return strcmp(pic_str(pic, str1), pic_str(pic, str2));
}
int
pic_str_hash(pic_state *pic, pic_value str)
{
const char *s;
int h = 0;
s = pic_str(pic, str);
while (*s) {
h = (h << 5) - h + *s++;
}
return h;
}
const char *
pic_str(pic_state *pic, pic_value str)
{
struct rope *rope = pic_str_ptr(pic, str)->rope, *r;
if (rope->isleaf && rope->u.leaf.str[rope->weight] == '\0') {
return rope->u.leaf.str;
}
r = make_rope_leaf(pic, 0, rope->weight);
flatten(pic, rope, r, r->buf);
return r->u.leaf.str;
}
static pic_value
pic_str_string_p(pic_state *pic)
{
pic_value v;
pic_get_args(pic, "o", &v);
return pic_bool_value(pic, pic_str_p(pic, v));
}
static pic_value
pic_str_string(pic_state *pic)
{
int argc, i;
pic_value *argv;
char *buf;
pic_get_args(pic, "*", &argc, &argv);
buf = pic_alloca(pic, argc);
for (i = 0; i < argc; ++i) {
TYPE_CHECK(pic, argv[i], char);
buf[i] = pic_char(pic, argv[i]);
}
return pic_str_value(pic, buf, argc);
}
static pic_value
pic_str_make_string(pic_state *pic)
{
int len;
char c = ' ';
char *buf;
pic_get_args(pic, "i|c", &len, &c);
if (len < 0) {
pic_error(pic, "make-string: negative length given", 1, pic_int_value(pic, len));
}
buf = pic_alloca(pic, len);
memset(buf, c, len);
return pic_str_value(pic, buf, len);
}
static pic_value
pic_str_string_length(pic_state *pic)
{
pic_value str;
pic_get_args(pic, "s", &str);
return pic_int_value(pic, pic_str_len(pic, str));
}
static pic_value
pic_str_string_ref(pic_state *pic)
{
pic_value str;
int k;
pic_get_args(pic, "si", &str, &k);
VALID_INDEX(pic, pic_str_len(pic, str), k);
return pic_char_value(pic, pic_str_ref(pic, str, k));
}
static pic_value
pic_str_string_set(pic_state *pic)
{
pic_value str, x, y, z;
char c;
int k, len;
pic_get_args(pic, "sic", &str, &k, &c);
len = pic_str_len(pic, str);
VALID_INDEX(pic, len, k);
x = pic_str_sub(pic, str, 0, k);
y = pic_str_value(pic, &c, 1);
z = pic_str_sub(pic, str, k + 1, len);
str_update(pic, str, pic_str_cat(pic, x, pic_str_cat(pic, y, z)));
return pic_undef_value(pic);
}
#define DEFINE_STRING_CMP(name, op) \
static pic_value \
pic_str_string_##name(pic_state *pic) \
{ \
int argc, i; \
pic_value *argv; \
\
pic_get_args(pic, "*", &argc, &argv); \
\
if (argc < 1 || ! pic_str_p(pic, argv[0])) { \
return pic_false_value(pic); \
} \
\
for (i = 1; i < argc; ++i) { \
if (! pic_str_p(pic, argv[i])) { \
return pic_false_value(pic); \
} \
if (! (pic_str_cmp(pic, argv[i-1], argv[i]) op 0)) { \
return pic_false_value(pic); \
} \
} \
return pic_true_value(pic); \
}
DEFINE_STRING_CMP(eq, ==)
DEFINE_STRING_CMP(lt, <)
DEFINE_STRING_CMP(gt, >)
DEFINE_STRING_CMP(le, <=)
DEFINE_STRING_CMP(ge, >=)
static pic_value
pic_str_string_copy(pic_state *pic)
{
pic_value str;
int n, start, end, len;
n = pic_get_args(pic, "s|ii", &str, &start, &end);
len = pic_str_len(pic, str);
switch (n) {
case 1:
start = 0;
case 2:
end = len;
}
VALID_RANGE(pic, len, start, end);
return pic_str_sub(pic, str, start, end);
}
static pic_value
pic_str_string_copy_ip(pic_state *pic)
{
pic_value to, from, x, y, z;
int n, at, start, end, tolen, fromlen;
n = pic_get_args(pic, "sis|ii", &to, &at, &from, &start, &end);
tolen = pic_str_len(pic, to);
fromlen = pic_str_len(pic, from);
switch (n) {
case 3:
start = 0;
case 4:
end = fromlen;
}
VALID_ATRANGE(pic, tolen, at, fromlen, start, end);
x = pic_str_sub(pic, to, 0, at);
y = pic_str_sub(pic, from, start, end);
z = pic_str_sub(pic, to, at + end - start, tolen);
str_update(pic, to, pic_str_cat(pic, x, pic_str_cat(pic, y, z)));
return pic_undef_value(pic);
}
static pic_value
pic_str_string_fill_ip(pic_state *pic)
{
pic_value str, x, y, z;
char c, *buf;
int n, start, end, len;
n = pic_get_args(pic, "sc|ii", &str, &c, &start, &end);
len = pic_str_len(pic, str);
switch (n) {
case 2:
start = 0;
case 3:
end = len;
}
VALID_RANGE(pic, len, start, end);
buf = pic_alloca(pic, end - start);
memset(buf, c, end - start);
x = pic_str_sub(pic, str, 0, start);
y = pic_str_value(pic, buf, end - start);
z = pic_str_sub(pic, str, end, len);
str_update(pic, str, pic_str_cat(pic, x, pic_str_cat(pic, y, z)));
return pic_undef_value(pic);
}
static pic_value
pic_str_string_append(pic_state *pic)
{
int argc, i;
pic_value *argv;
pic_value str = pic_lit_value(pic, "");
pic_get_args(pic, "*", &argc, &argv);
for (i = 0; i < argc; ++i) {
TYPE_CHECK(pic, argv[i], str);
str = pic_str_cat(pic, str, argv[i]);
}
return str;
}
static pic_value
pic_str_string_map(pic_state *pic)
{
pic_value proc, *argv, vals, val;
int argc, i, len, j;
char *buf;
pic_get_args(pic, "l*", &proc, &argc, &argv);
if (argc == 0) {
pic_error(pic, "string-map: one or more strings expected, but got zero", 0);
}
len = INT_MAX;
for (i = 0; i < argc; ++i) {
int l;
TYPE_CHECK(pic, argv[i], str);
l = pic_str_len(pic, argv[i]);
len = len < l ? len : l;
}
buf = pic_alloca(pic, len);
for (i = 0; i < len; ++i) {
vals = pic_nil_value(pic);
for (j = 0; j < argc; ++j) {
pic_push(pic, pic_char_value(pic, pic_str_ref(pic, argv[j], i)), vals);
}
vals = pic_reverse(pic, vals);
val = pic_funcall(pic, "picrin.base", "apply", 2, proc, vals);
TYPE_CHECK(pic, val, char);
buf[i] = pic_char(pic, val);
}
return pic_str_value(pic, buf, len);
}
static pic_value
pic_str_string_for_each(pic_state *pic)
{
pic_value proc, *argv, vals;
int argc, i, len, j;
pic_get_args(pic, "l*", &proc, &argc, &argv);
if (argc == 0) {
pic_error(pic, "string-map: one or more strings expected, but got zero", 0);
}
len = INT_MAX;
for (i = 0; i < argc; ++i) {
int l;
TYPE_CHECK(pic, argv[i], str);
l = pic_str_len(pic, argv[i]);
len = len < l ? len : l;
}
for (i = 0; i < len; ++i) {
vals = pic_nil_value(pic);
for (j = 0; j < argc; ++j) {
pic_push(pic, pic_char_value(pic, pic_str_ref(pic, argv[j], i)), vals);
}
vals = pic_reverse(pic, vals);
pic_funcall(pic, "picrin.base", "apply", 2, proc, vals);
}
return pic_undef_value(pic);
}
static pic_value
pic_str_list_to_string(pic_state *pic)
{
pic_value list, e, it;
int i;
char *buf;
pic_get_args(pic, "o", &list);
buf = pic_alloca(pic, pic_length(pic, list));
i = 0;
pic_for_each (e, list, it) {
TYPE_CHECK(pic, e, char);
buf[i++] = pic_char(pic, e);
}
return pic_str_value(pic, buf, i);
}
static pic_value
pic_str_string_to_list(pic_state *pic)
{
pic_value str, list;
int n, start, end, len, i;
n = pic_get_args(pic, "s|ii", &str, &start, &end);
len = pic_str_len(pic, str);
switch (n) {
case 1:
start = 0;
case 2:
end = len;
}
VALID_RANGE(pic, len, start, end);
list = pic_nil_value(pic);
for (i = start; i < end; ++i) {
pic_push(pic, pic_char_value(pic, pic_str_ref(pic, str, i)), list);
}
return pic_reverse(pic, list);
}
void
pic_init_str(pic_state *pic)
{
pic_defun(pic, "string?", pic_str_string_p);
pic_defun(pic, "string", pic_str_string);
pic_defun(pic, "make-string", pic_str_make_string);
pic_defun(pic, "string-length", pic_str_string_length);
pic_defun(pic, "string-ref", pic_str_string_ref);
pic_defun(pic, "string-set!", pic_str_string_set);
pic_defun(pic, "string-copy", pic_str_string_copy);
pic_defun(pic, "string-copy!", pic_str_string_copy_ip);
pic_defun(pic, "string-fill!", pic_str_string_fill_ip);
pic_defun(pic, "string-append", pic_str_string_append);
pic_defun(pic, "string-map", pic_str_string_map);
pic_defun(pic, "string-for-each", pic_str_string_for_each);
pic_defun(pic, "list->string", pic_str_list_to_string);
pic_defun(pic, "string->list", pic_str_string_to_list);
pic_defun(pic, "string=?", pic_str_string_eq);
pic_defun(pic, "string<?", pic_str_string_lt);
pic_defun(pic, "string>?", pic_str_string_gt);
pic_defun(pic, "string<=?", pic_str_string_le);
pic_defun(pic, "string>=?", pic_str_string_ge);
}