picrin/extlib/benz/string.c

742 lines
16 KiB
C
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2014-08-25 00:38:09 -04:00
/**
* See Copyright Notice in picrin.h
*/
#include "picrin.h"
#include "picrin/string.h"
#include "picrin/pair.h"
#include "picrin/port.h"
#include "picrin/error.h"
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struct pic_chunk {
char *str;
int refcnt;
size_t len;
char autofree;
};
struct pic_rope {
int refcnt;
size_t weight;
struct pic_chunk *chunk;
size_t offset;
struct pic_rope *left, *right;
};
#define CHUNK_INCREF(c) do { \
(c)->refcnt++; \
} while (0)
#define CHUNK_DECREF(c) do { \
struct pic_chunk *c_ = (c); \
if (! --c_->refcnt) { \
if (c_->autofree) \
pic_free(pic, c_->str); \
pic_free(pic, c_); \
} \
} while (0)
void
pic_rope_incref(pic_state *pic, struct pic_rope *x) {
PIC_UNUSED(pic);
x->refcnt++;
}
void
pic_rope_decref(pic_state *pic, struct pic_rope *x) {
if (! --x->refcnt) {
if (x->chunk) {
CHUNK_DECREF(x->chunk);
pic_free(pic, x);
return;
}
pic_rope_decref(pic, x->left);
pic_rope_decref(pic, x->right);
pic_free(pic, x);
}
}
static struct pic_chunk *
pic_make_chunk(pic_state *pic, const char *str, size_t len)
{
char *buf;
struct pic_chunk *c;
buf = pic_malloc(pic, len + 1);
buf[len] = 0;
memcpy(buf, str, len);
c = pic_malloc(pic, sizeof(struct pic_chunk));
c->refcnt = 1;
c->str = buf;
c->len = len;
c->autofree = 1;
return c;
}
static struct pic_rope *
pic_make_rope(pic_state *pic, struct pic_chunk *c)
{
struct pic_rope *x;
x = pic_malloc(pic, sizeof(struct pic_rope));
x->refcnt = 1;
x->left = NULL;
x->right = NULL;
x->weight = c->len;
x->offset = 0;
x->chunk = c; /* delegate ownership */
return x;
}
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static pic_str *
pic_make_string(pic_state *pic, struct pic_rope *rope)
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{
pic_str *str;
str = (pic_str *)pic_obj_alloc(pic, sizeof(pic_str), PIC_TT_STRING);
str->rope = rope; /* delegate ownership */
return str;
}
static size_t
rope_len(struct pic_rope *x)
{
return x->weight;
}
static char
rope_at(struct pic_rope *x, size_t i)
{
while (i < x->weight) {
if (x->chunk) {
return x->chunk->str[x->offset + i];
}
if (i < x->left->weight) {
x = x->left;
} else {
x = x->right;
i -= x->left->weight;
}
}
return -1;
}
static struct pic_rope *
rope_cat(pic_state *pic, struct pic_rope *x, struct pic_rope *y)
{
struct pic_rope *z;
z = pic_malloc(pic, sizeof(struct pic_rope));
z->refcnt = 1;
z->left = x;
z->right = y;
z->weight = x->weight + y->weight;
z->offset = 0;
z->chunk = NULL;
pic_rope_incref(pic, x);
pic_rope_incref(pic, y);
return z;
}
static struct pic_rope *
rope_sub(pic_state *pic, struct pic_rope *x, size_t i, size_t j)
{
assert(i <= j);
assert(j <= x->weight);
if (i == 0 && x->weight == j) {
pic_rope_incref(pic, x);
return x;
}
if (x->chunk) {
struct pic_rope *y;
y = pic_malloc(pic, sizeof(struct pic_rope));
y->refcnt = 1;
y->left = NULL;
y->right = NULL;
y->weight = j - i;
y->offset = x->offset + i;
y->chunk = x->chunk;
CHUNK_INCREF(x->chunk);
return y;
}
if (j <= x->left->weight) {
return rope_sub(pic, x->left, i, j);
}
else if (x->left->weight <= i) {
return rope_sub(pic, x->right, i - x->left->weight, j - x->left->weight);
}
else {
struct pic_rope *r, *l;
l = rope_sub(pic, x->left, i, x->left->weight);
r = rope_sub(pic, x->right, 0, j - x->left->weight);
x = rope_cat(pic, l, r);
pic_rope_decref(pic, l);
pic_rope_decref(pic, r);
return x;
}
}
static void
flatten(pic_state *pic, struct pic_rope *x, struct pic_chunk *c, size_t offset)
{
if (x->chunk) {
memcpy(c->str + offset, x->chunk->str + x->offset, x->weight);
CHUNK_DECREF(x->chunk);
x->chunk = c;
x->offset = offset;
CHUNK_INCREF(c);
return;
}
flatten(pic, x->left, c, offset);
flatten(pic, x->right, c, offset + x->left->weight);
pic_rope_decref(pic, x->left);
pic_rope_decref(pic, x->right);
x->left = x->right = NULL;
x->chunk = c;
x->offset = offset;
CHUNK_INCREF(c);
}
static const char *
rope_cstr(pic_state *pic, struct pic_rope *x)
{
struct pic_chunk *c;
if (x->chunk && x->offset == 0 && x->weight == x->chunk->len) {
return x->chunk->str; /* reuse cached chunk */
}
c = pic_malloc(pic, sizeof(struct pic_chunk));
c->refcnt = 1;
c->len = x->weight;
c->autofree = 1;
c->str = pic_malloc(pic, c->len + 1);
c->str[c->len] = '\0';
flatten(pic, x, c, 0);
CHUNK_DECREF(c);
return c->str;
}
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pic_str *
pic_make_str(pic_state *pic, const char *str, size_t len)
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{
if (str == NULL && len > 0) {
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pic_errorf(pic, "zero length specified against NULL ptr");
}
return pic_make_string(pic, pic_make_rope(pic, pic_make_chunk(pic, str, len)));
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}
pic_str *
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pic_make_str_cstr(pic_state *pic, const char *cstr)
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{
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return pic_make_str(pic, cstr, strlen(cstr));
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}
pic_str *
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pic_make_str_fill(pic_state *pic, size_t len, char fill)
{
size_t i;
char *buf = pic_malloc(pic, len);
pic_str *str;
for (i = 0; i < len; ++i) {
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buf[i] = fill;
}
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buf[i] = '\0';
str = pic_make_str(pic, buf, len);
pic_free(pic, buf);
return str;
}
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size_t
pic_str_len(pic_str *str)
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{
return rope_len(str->rope);
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}
char
pic_str_ref(pic_state *pic, pic_str *str, size_t i)
{
int c;
c = rope_at(str->rope, i);
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if (c == -1) {
pic_errorf(pic, "index out of range %d", i);
}
return (char)c;
}
pic_str *
pic_str_cat(pic_state *pic, pic_str *a, pic_str *b)
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{
return pic_make_string(pic, rope_cat(pic, a->rope, b->rope));
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}
pic_str *
pic_str_sub(pic_state *pic, pic_str *str, size_t s, size_t e)
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{
return pic_make_string(pic, rope_sub(pic, str->rope, s, e));
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}
int
pic_str_cmp(pic_state *pic, pic_str *str1, pic_str *str2)
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{
return strcmp(pic_str_cstr(pic, str1), pic_str_cstr(pic, str2));
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}
const char *
pic_str_cstr(pic_state *pic, pic_str *str)
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{
return rope_cstr(pic, str->rope);
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}
pic_value
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pic_xvfformat(pic_state *pic, xFILE *file, const char *fmt, va_list ap)
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{
char c;
pic_value irrs = pic_nil_value();
while ((c = *fmt++)) {
switch (c) {
default:
xfputc(c, file);
break;
case '%':
c = *fmt++;
if (! c)
goto exit;
switch (c) {
default:
xfputc(c, file);
break;
case '%':
xfputc('%', file);
break;
case 'c':
xfprintf(file, "%c", va_arg(ap, int));
break;
case 's':
xfprintf(file, "%s", va_arg(ap, const char *));
break;
case 'd':
xfprintf(file, "%d", va_arg(ap, int));
break;
case 'p':
xfprintf(file, "%p", va_arg(ap, void *));
break;
case 'f':
xfprintf(file, "%f", va_arg(ap, double));
break;
}
break;
case '~':
c = *fmt++;
if (! c)
goto exit;
switch (c) {
default:
xfputc(c, file);
break;
case '~':
xfputc('~', file);
break;
case '%':
xfputc('\n', file);
break;
case 'a':
irrs = pic_cons(pic, pic_fdisplay(pic, va_arg(ap, pic_value), file), irrs);
break;
case 's':
irrs = pic_cons(pic, pic_fwrite(pic, va_arg(ap, pic_value), file), irrs);
break;
}
break;
}
}
exit:
return pic_reverse(pic, irrs);
}
pic_value
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pic_xvformat(pic_state *pic, const char *fmt, va_list ap)
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{
struct pic_port *port;
pic_value irrs;
port = pic_open_output_string(pic);
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irrs = pic_xvfformat(pic, port->file, fmt, ap);
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irrs = pic_cons(pic, pic_obj_value(pic_get_output_string(pic, port)), irrs);
pic_close_port(pic, port);
return irrs;
}
pic_value
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pic_xformat(pic_state *pic, const char *fmt, ...)
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{
va_list ap;
pic_value objs;
va_start(ap, fmt);
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objs = pic_xvformat(pic, fmt, ap);
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va_end(ap);
return objs;
}
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void
pic_vfformat(pic_state *pic, xFILE *file, const char *fmt, va_list ap)
{
pic_xvfformat(pic, file, fmt, ap);
}
pic_str *
pic_vformat(pic_state *pic, const char *fmt, va_list ap)
{
struct pic_port *port;
pic_str *str;
port = pic_open_output_string(pic);
pic_vfformat(pic, port->file, fmt, ap);
str = pic_get_output_string(pic, port);
pic_close_port(pic, port);
return str;
}
pic_str *
pic_format(pic_state *pic, const char *fmt, ...)
{
va_list ap;
pic_str *str;
va_start(ap, fmt);
str = pic_vformat(pic, fmt, ap);
va_end(ap);
return str;
}
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static pic_value
pic_str_string_p(pic_state *pic)
{
pic_value v;
pic_get_args(pic, "o", &v);
return pic_bool_value(pic_str_p(v));
}
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static pic_value
pic_str_string(pic_state *pic)
{
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size_t argc, i;
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pic_value *argv;
pic_str *str;
char *buf;
pic_get_args(pic, "*", &argc, &argv);
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buf = pic_alloc(pic, (size_t)argc);
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for (i = 0; i < argc; ++i) {
pic_assert_type(pic, argv[i], char);
buf[i] = pic_char(argv[i]);
}
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str = pic_make_str(pic, buf, (size_t)argc);
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pic_free(pic, buf);
return pic_obj_value(str);
}
static pic_value
pic_str_make_string(pic_state *pic)
{
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size_t len;
char c = ' ';
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pic_get_args(pic, "k|c", &len, &c);
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return pic_obj_value(pic_make_str_fill(pic, len, c));
}
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static pic_value
pic_str_string_length(pic_state *pic)
{
pic_str *str;
pic_get_args(pic, "s", &str);
return pic_size_value(pic_str_len(str));
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}
static pic_value
pic_str_string_ref(pic_state *pic)
{
pic_str *str;
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size_t k;
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pic_get_args(pic, "sk", &str, &k);
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return pic_char_value(pic_str_ref(pic, str, k));
}
#define DEFINE_STRING_CMP(name, op) \
static pic_value \
pic_str_string_##name(pic_state *pic) \
{ \
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size_t argc, i; \
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pic_value *argv; \
\
pic_get_args(pic, "*", &argc, &argv); \
\
if (argc < 1 || ! pic_str_p(argv[0])) { \
return pic_false_value(); \
} \
\
for (i = 1; i < argc; ++i) { \
if (! pic_str_p(argv[i])) { \
return pic_false_value(); \
} \
if (! (pic_str_cmp(pic, pic_str_ptr(argv[i-1]), pic_str_ptr(argv[i])) op 0)) { \
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return pic_false_value(); \
} \
} \
return pic_true_value(); \
}
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_str *str;
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int n;
size_t start, end;
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n = pic_get_args(pic, "s|kk", &str, &start, &end);
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switch (n) {
case 1:
start = 0;
case 2:
end = pic_str_len(str);
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}
return pic_obj_value(pic_str_sub(pic, str, start, end));
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}
static pic_value
pic_str_string_append(pic_state *pic)
{
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size_t argc, i;
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pic_value *argv;
pic_str *str;
pic_get_args(pic, "*", &argc, &argv);
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str = pic_make_str(pic, NULL, 0);
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for (i = 0; i < argc; ++i) {
if (! pic_str_p(argv[i])) {
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pic_errorf(pic, "type error");
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}
str = pic_str_cat(pic, str, pic_str_ptr(argv[i]));
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}
return pic_obj_value(str);
}
static pic_value
pic_str_string_map(pic_state *pic)
{
struct pic_proc *proc;
pic_value *argv, vals, val;
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size_t argc, i, len, j;
pic_str *str;
char *buf;
pic_get_args(pic, "l*", &proc, &argc, &argv);
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if (argc == 0) {
pic_errorf(pic, "string-map: one or more strings expected, but got zero");
} else {
pic_assert_type(pic, argv[0], str);
len = pic_str_len(pic_str_ptr(argv[0]));
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}
for (i = 1; i < argc; ++i) {
pic_assert_type(pic, argv[i], str);
len = len < pic_str_len(pic_str_ptr(argv[i]))
? len
: pic_str_len(pic_str_ptr(argv[i]));
}
buf = pic_malloc(pic, len);
pic_try {
for (i = 0; i < len; ++i) {
vals = pic_nil_value();
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for (j = 0; j < argc; ++j) {
pic_push(pic, pic_char_value(pic_str_ref(pic, pic_str_ptr(argv[j]), i)), vals);
}
val = pic_apply(pic, proc, vals);
pic_assert_type(pic, val, char);
buf[i] = pic_char(val);
}
str = pic_make_str(pic, buf, len);
}
pic_catch {
pic_free(pic, buf);
pic_raise(pic, pic->err);
}
pic_free(pic, buf);
return pic_obj_value(str);
}
static pic_value
pic_str_string_for_each(pic_state *pic)
{
struct pic_proc *proc;
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size_t argc, len, i, j;
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pic_value *argv, vals;
pic_get_args(pic, "l*", &proc, &argc, &argv);
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if (argc == 0) {
pic_errorf(pic, "string-map: one or more strings expected, but got zero");
} else {
pic_assert_type(pic, argv[0], str);
len = pic_str_len(pic_str_ptr(argv[0]));
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}
for (i = 1; i < argc; ++i) {
pic_assert_type(pic, argv[i], str);
len = len < pic_str_len(pic_str_ptr(argv[i]))
? len
: pic_str_len(pic_str_ptr(argv[i]));
}
for (i = 0; i < len; ++i) {
vals = pic_nil_value();
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for (j = 0; j < argc; ++j) {
pic_push(pic, pic_char_value(pic_str_ref(pic, pic_str_ptr(argv[j]), i)), vals);
}
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pic_apply(pic, proc, vals);
}
return pic_none_value();
}
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static pic_value
pic_str_list_to_string(pic_state *pic)
{
pic_str *str;
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pic_value list, e, it;
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size_t i = 0;
char *buf;
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pic_get_args(pic, "o", &list);
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if (pic_length(pic, list) == 0) {
return pic_obj_value(pic_make_str(pic, NULL, 0));
}
buf = pic_malloc(pic, pic_length(pic, list));
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pic_try {
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pic_for_each (e, list, it) {
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pic_assert_type(pic, e, char);
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buf[i++] = pic_char(e);
}
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str = pic_make_str(pic, buf, i);
}
pic_catch {
pic_free(pic, buf);
pic_raise(pic, pic->err);
}
pic_free(pic, buf);
return pic_obj_value(str);
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}
static pic_value
pic_str_string_to_list(pic_state *pic)
{
pic_str *str;
pic_value list;
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int n;
size_t start, end, i;
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n = pic_get_args(pic, "s|kk", &str, &start, &end);
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switch (n) {
case 1:
start = 0;
case 2:
end = pic_str_len(str);
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}
list = pic_nil_value();
for (i = start; i < end; ++i) {
pic_push(pic, pic_char_value(pic_str_ref(pic, str, i)), list);
}
return pic_reverse(pic, list);
}
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void
pic_init_str(pic_state *pic)
{
pic_defun(pic, "string?", pic_str_string_p);
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pic_defun(pic, "string", pic_str_string);
pic_defun(pic, "make-string", pic_str_make_string);
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pic_defun(pic, "string-length", pic_str_string_length);
pic_defun(pic, "string-ref", pic_str_string_ref);
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pic_defun(pic, "string-copy", pic_str_string_copy);
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);
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pic_defun(pic, "list->string", pic_str_list_to_string);
pic_defun(pic, "string->list", pic_str_string_to_list);
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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);
}