829 lines
16 KiB
C
829 lines
16 KiB
C
/**
|
|
* See Copyright Notice in picrin.h
|
|
*/
|
|
|
|
#include "picrin.h"
|
|
#include "picrin/read.h"
|
|
#include "picrin/error.h"
|
|
#include "picrin/pair.h"
|
|
#include "picrin/string.h"
|
|
#include "picrin/vector.h"
|
|
#include "picrin/blob.h"
|
|
#include "picrin/port.h"
|
|
#include "picrin/proc.h"
|
|
#include "picrin/symbol.h"
|
|
|
|
static pic_value read(pic_state *pic, struct pic_port *port, int c);
|
|
static pic_value read_nullable(pic_state *pic, struct pic_port *port, int c);
|
|
|
|
pic_noreturn static void
|
|
read_error(pic_state *pic, const char *msg)
|
|
{
|
|
pic_throw(pic, pic->sREAD, msg, pic_nil_value());
|
|
}
|
|
|
|
static int
|
|
skip(struct pic_port *port, int c)
|
|
{
|
|
while (isspace(c)) {
|
|
c = xfgetc(port->file);
|
|
}
|
|
return c;
|
|
}
|
|
|
|
static int
|
|
next(struct pic_port *port)
|
|
{
|
|
return xfgetc(port->file);
|
|
}
|
|
|
|
static int
|
|
peek(struct pic_port *port)
|
|
{
|
|
int c;
|
|
|
|
xungetc((c = xfgetc(port->file)), port->file);
|
|
|
|
return c;
|
|
}
|
|
|
|
static bool
|
|
expect(struct pic_port *port, const char *str)
|
|
{
|
|
int c;
|
|
|
|
while ((c = (int)*str++) != 0) {
|
|
if (c != peek(port))
|
|
return false;
|
|
next(port);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
isdelim(int c)
|
|
{
|
|
return c == EOF || strchr("();,|\" \t\n\r", c) != NULL; /* ignores "#", "'" */
|
|
}
|
|
|
|
static bool
|
|
strcaseeq(const char *s1, const char *s2)
|
|
{
|
|
char a, b;
|
|
|
|
while ((a = *s1++) * (b = *s2++)) {
|
|
if (tolower(a) != tolower(b))
|
|
return false;
|
|
}
|
|
return a == b;
|
|
}
|
|
|
|
static pic_value
|
|
read_comment(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
PIC_UNUSED(pic);
|
|
|
|
do {
|
|
c = next(port);
|
|
} while (! (c == EOF || c == '\n'));
|
|
|
|
return pic_undef_value();
|
|
}
|
|
|
|
static pic_value
|
|
read_block_comment(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
int x, y;
|
|
int i = 1;
|
|
|
|
PIC_UNUSED(pic);
|
|
PIC_UNUSED(c);
|
|
|
|
y = next(port);
|
|
|
|
while (y != EOF && i > 0) {
|
|
x = y;
|
|
y = next(port);
|
|
if (x == '|' && y == '#') {
|
|
i--;
|
|
}
|
|
if (x == '#' && y == '|') {
|
|
i++;
|
|
}
|
|
}
|
|
|
|
return pic_undef_value();
|
|
}
|
|
|
|
static pic_value
|
|
read_datum_comment(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
PIC_UNUSED(c);
|
|
|
|
read(pic, port, next(port));
|
|
|
|
return pic_undef_value();
|
|
}
|
|
|
|
static pic_value
|
|
read_directive(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
switch (peek(port)) {
|
|
case 'n':
|
|
if (expect(port, "no-fold-case")) {
|
|
pic->reader->typecase = PIC_CASE_DEFAULT;
|
|
return pic_undef_value();
|
|
}
|
|
break;
|
|
case 'f':
|
|
if (expect(port, "fold-case")) {
|
|
pic->reader->typecase = PIC_CASE_FOLD;
|
|
return pic_undef_value();
|
|
}
|
|
break;
|
|
}
|
|
|
|
return read_comment(pic, port, c);
|
|
}
|
|
|
|
static pic_value
|
|
read_eval(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
pic_value form;
|
|
|
|
PIC_UNUSED(c);
|
|
|
|
form = read(pic, port, next(port));
|
|
|
|
return pic_eval(pic, form, pic->lib);
|
|
}
|
|
|
|
static pic_value
|
|
read_quote(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
PIC_UNUSED(c);
|
|
|
|
return pic_list2(pic, pic_obj_value(pic->sQUOTE), read(pic, port, next(port)));
|
|
}
|
|
|
|
static pic_value
|
|
read_quasiquote(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
PIC_UNUSED(c);
|
|
|
|
return pic_list2(pic, pic_obj_value(pic->sQUASIQUOTE), read(pic, port, next(port)));
|
|
}
|
|
|
|
static pic_value
|
|
read_unquote(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
pic_sym *tag = pic->sUNQUOTE;
|
|
|
|
PIC_UNUSED(c);
|
|
|
|
if (peek(port) == '@') {
|
|
tag = pic->sUNQUOTE_SPLICING;
|
|
next(port);
|
|
}
|
|
return pic_list2(pic, pic_obj_value(tag), read(pic, port, next(port)));
|
|
}
|
|
|
|
static pic_value
|
|
read_symbol(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
size_t len;
|
|
char *buf;
|
|
pic_sym *sym;
|
|
|
|
len = 1;
|
|
buf = pic_alloc(pic, len + 1);
|
|
buf[0] = c;
|
|
buf[1] = 0;
|
|
|
|
while (! isdelim(peek(port))) {
|
|
c = next(port);
|
|
if (pic->reader->typecase == PIC_CASE_FOLD) {
|
|
c = tolower(c);
|
|
}
|
|
len += 1;
|
|
buf = pic_realloc(pic, buf, len + 1);
|
|
buf[len - 1] = c;
|
|
buf[len] = 0;
|
|
}
|
|
|
|
sym = pic_intern_cstr(pic, buf);
|
|
pic_free(pic, buf);
|
|
|
|
return pic_obj_value(sym);
|
|
}
|
|
|
|
static size_t
|
|
read_uinteger(pic_state *pic, struct pic_port *port, int c, char buf[])
|
|
{
|
|
size_t i = 0;
|
|
|
|
if (! isdigit(c)) {
|
|
read_error(pic, "expected one or more digits");
|
|
}
|
|
|
|
buf[i++] = (char)c;
|
|
while (isdigit(c = peek(port))) {
|
|
buf[i++] = (char)next(port);
|
|
}
|
|
|
|
buf[i] = '\0';
|
|
|
|
return i;
|
|
}
|
|
|
|
static size_t
|
|
read_suffix(pic_state *pic, struct pic_port *port, char buf[])
|
|
{
|
|
size_t i = 0;
|
|
int c;
|
|
|
|
c = peek(port);
|
|
|
|
if (c != 'e' && c != 'E') {
|
|
return i;
|
|
}
|
|
|
|
buf[i++] = (char)next(port);
|
|
|
|
switch ((c = next(port))) {
|
|
case '-':
|
|
case '+':
|
|
buf[i++] = (char)c;
|
|
c = next(port);
|
|
default:
|
|
return i + read_uinteger(pic, port, c, buf + i);
|
|
}
|
|
}
|
|
|
|
static pic_value
|
|
read_unsigned(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
char buf[256];
|
|
size_t i;
|
|
|
|
i = read_uinteger(pic, port, c, buf);
|
|
|
|
switch (peek(port)) {
|
|
case '.':
|
|
buf[i++] = (char)next(port);
|
|
i += read_uinteger(pic, port, next(port), buf + i);
|
|
read_suffix(pic, port, buf + i);
|
|
return pic_float_value(atof(buf));
|
|
|
|
default:
|
|
read_suffix(pic, port, buf + i);
|
|
return pic_int_value((int)(atof(buf)));
|
|
}
|
|
}
|
|
|
|
static pic_value
|
|
read_number(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
return read_unsigned(pic, port, c);
|
|
}
|
|
|
|
static pic_value
|
|
negate(pic_value n)
|
|
{
|
|
if (pic_int_p(n)) {
|
|
return pic_int_value(-pic_int(n));
|
|
} else {
|
|
return pic_float_value(-pic_float(n));
|
|
}
|
|
}
|
|
|
|
static pic_value
|
|
read_minus(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
pic_value sym;
|
|
|
|
if (isdigit(peek(port))) {
|
|
return negate(read_unsigned(pic, port, next(port)));
|
|
}
|
|
else {
|
|
sym = read_symbol(pic, port, c);
|
|
if (strcaseeq(pic_symbol_name(pic, pic_sym_ptr(sym)), "-inf.0")) {
|
|
return pic_float_value(-INFINITY);
|
|
}
|
|
if (strcaseeq(pic_symbol_name(pic, pic_sym_ptr(sym)), "-nan.0")) {
|
|
return pic_float_value(-NAN);
|
|
}
|
|
return sym;
|
|
}
|
|
}
|
|
|
|
static pic_value
|
|
read_plus(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
pic_value sym;
|
|
|
|
if (isdigit(peek(port))) {
|
|
return read_unsigned(pic, port, next(port));
|
|
}
|
|
else {
|
|
sym = read_symbol(pic, port, c);
|
|
if (strcaseeq(pic_symbol_name(pic, pic_sym_ptr(sym)), "+inf.0")) {
|
|
return pic_float_value(INFINITY);
|
|
}
|
|
if (strcaseeq(pic_symbol_name(pic, pic_sym_ptr(sym)), "+nan.0")) {
|
|
return pic_float_value(NAN);
|
|
}
|
|
return sym;
|
|
}
|
|
}
|
|
|
|
static pic_value
|
|
read_true(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
PIC_UNUSED(pic);
|
|
|
|
if ((c = peek(port)) == 'r') {
|
|
if (! expect(port, "rue")) {
|
|
read_error(pic, "unexpected character while reading #true");
|
|
}
|
|
} else if (! isdelim(c)) {
|
|
read_error(pic, "non-delimiter character given after #t");
|
|
}
|
|
|
|
return pic_true_value();
|
|
}
|
|
|
|
static pic_value
|
|
read_false(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
PIC_UNUSED(pic);
|
|
|
|
if ((c = peek(port)) == 'a') {
|
|
if (! expect(port, "alse")) {
|
|
read_error(pic, "unexpected character while reading #false");
|
|
}
|
|
} else if (! isdelim(c)) {
|
|
read_error(pic, "non-delimiter character given after #f");
|
|
}
|
|
|
|
return pic_false_value();
|
|
}
|
|
|
|
static pic_value
|
|
read_char(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
c = next(port);
|
|
|
|
if (! isdelim(peek(port))) {
|
|
switch (c) {
|
|
default: read_error(pic, "unexpected character after char literal");
|
|
case 'a': c = '\a'; if (! expect(port, "lerm")) goto fail; break;
|
|
case 'b': c = '\b'; if (! expect(port, "ackspace")) goto fail; break;
|
|
case 'd': c = 0x7F; if (! expect(port, "elete")) goto fail; break;
|
|
case 'e': c = 0x1B; if (! expect(port, "scape")) goto fail; break;
|
|
case 'n':
|
|
if ((c = peek(port)) == 'e') {
|
|
c = '\n';
|
|
if (! expect(port, "ewline"))
|
|
goto fail;
|
|
} else {
|
|
c = '\0';
|
|
if (! expect(port, "ull"))
|
|
goto fail;
|
|
}
|
|
break;
|
|
case 'r': c = '\r'; if (! expect(port, "eturn")) goto fail; break;
|
|
case 's': c = ' '; if (! expect(port, "pace")) goto fail; break;
|
|
case 't': c = '\t'; if (! expect(port, "ab")) goto fail; break;
|
|
}
|
|
}
|
|
|
|
return pic_char_value((char)c);
|
|
|
|
fail:
|
|
read_error(pic, "unexpected character while reading character literal");
|
|
}
|
|
|
|
static pic_value
|
|
read_string(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
char *buf;
|
|
size_t size, cnt;
|
|
pic_str *str;
|
|
|
|
size = 256;
|
|
buf = pic_alloc(pic, size);
|
|
cnt = 0;
|
|
|
|
/* TODO: intraline whitespaces */
|
|
|
|
while ((c = next(port)) != '"') {
|
|
if (c == '\\') {
|
|
switch (c = next(port)) {
|
|
case 'a': c = '\a'; break;
|
|
case 'b': c = '\b'; break;
|
|
case 't': c = '\t'; break;
|
|
case 'n': c = '\n'; break;
|
|
case 'r': c = '\r'; break;
|
|
}
|
|
}
|
|
buf[cnt++] = (char)c;
|
|
if (cnt >= size) {
|
|
buf = pic_realloc(pic, buf, size *= 2);
|
|
}
|
|
}
|
|
buf[cnt] = '\0';
|
|
|
|
str = pic_make_str(pic, buf, cnt);
|
|
pic_free(pic, buf);
|
|
return pic_obj_value(str);
|
|
}
|
|
|
|
static pic_value
|
|
read_pipe(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
char *buf;
|
|
size_t size, cnt;
|
|
pic_sym *sym;
|
|
/* Currently supports only ascii chars */
|
|
char HEX_BUF[3];
|
|
size_t i = 0;
|
|
|
|
size = 256;
|
|
buf = pic_alloc(pic, size);
|
|
cnt = 0;
|
|
while ((c = next(port)) != '|') {
|
|
if (c == '\\') {
|
|
switch ((c = next(port))) {
|
|
case 'a': c = '\a'; break;
|
|
case 'b': c = '\b'; break;
|
|
case 't': c = '\t'; break;
|
|
case 'n': c = '\n'; break;
|
|
case 'r': c = '\r'; break;
|
|
case 'x':
|
|
i = 0;
|
|
while ((HEX_BUF[i++] = (char)next(port)) != ';') {
|
|
if (i >= sizeof HEX_BUF)
|
|
read_error(pic, "expected ';'");
|
|
}
|
|
c = (char)strtol(HEX_BUF, NULL, 16);
|
|
break;
|
|
}
|
|
}
|
|
buf[cnt++] = (char)c;
|
|
if (cnt >= size) {
|
|
buf = pic_realloc(pic, buf, size *= 2);
|
|
}
|
|
}
|
|
buf[cnt] = '\0';
|
|
|
|
sym = pic_intern_cstr(pic, buf);
|
|
pic_free(pic, buf);
|
|
|
|
return pic_obj_value(sym);
|
|
}
|
|
|
|
static pic_value
|
|
read_blob(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
int nbits, n;
|
|
size_t len, i;
|
|
char buf[256];
|
|
unsigned char *dat;
|
|
pic_blob *blob;
|
|
|
|
nbits = 0;
|
|
|
|
while (isdigit(c = next(port))) {
|
|
nbits = 10 * nbits + c - '0';
|
|
}
|
|
|
|
if (nbits != 8) {
|
|
read_error(pic, "unsupported bytevector bit width");
|
|
}
|
|
|
|
if (c != '(') {
|
|
read_error(pic, "expected '(' character");
|
|
}
|
|
|
|
len = 0;
|
|
dat = NULL;
|
|
c = next(port);
|
|
while ((c = skip(port, c)) != ')') {
|
|
read_uinteger(pic, port, c, buf);
|
|
n = atoi(buf);
|
|
if (n < 0 || (1 << nbits) <= n) {
|
|
read_error(pic, "invalid element in bytevector literal");
|
|
}
|
|
len += 1;
|
|
dat = pic_realloc(pic, dat, len);
|
|
dat[len - 1] = (unsigned char)n;
|
|
c = next(port);
|
|
}
|
|
|
|
blob = pic_make_blob(pic, len);
|
|
for (i = 0; i < len; ++i) {
|
|
blob->data[i] = dat[i];
|
|
}
|
|
|
|
pic_free(pic, dat);
|
|
return pic_obj_value(blob);
|
|
}
|
|
|
|
static pic_value
|
|
read_pair(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
const int tOPEN = c;
|
|
const int tCLOSE = (c == '(') ? ')' : ']';
|
|
pic_value car, cdr;
|
|
|
|
retry:
|
|
|
|
c = skip(port, ' ');
|
|
|
|
if (c == tCLOSE) {
|
|
return pic_nil_value();
|
|
}
|
|
if (c == '.' && isdelim(peek(port))) {
|
|
cdr = read(pic, port, next(port));
|
|
|
|
closing:
|
|
if ((c = skip(port, ' ')) != tCLOSE) {
|
|
if (pic_undef_p(read_nullable(pic, port, c))) {
|
|
goto closing;
|
|
}
|
|
read_error(pic, "unmatched parenthesis");
|
|
}
|
|
return cdr;
|
|
}
|
|
else {
|
|
car = read_nullable(pic, port, c);
|
|
|
|
if (pic_undef_p(car)) {
|
|
goto retry;
|
|
}
|
|
|
|
cdr = read_pair(pic, port, tOPEN);
|
|
return pic_cons(pic, car, cdr);
|
|
}
|
|
}
|
|
|
|
static pic_value
|
|
read_vector(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
pic_value list;
|
|
|
|
list = read(pic, port, c);
|
|
|
|
return pic_obj_value(pic_make_vec_from_list(pic, list));
|
|
}
|
|
|
|
static pic_value
|
|
read_label_set(pic_state *pic, struct pic_port *port, int i)
|
|
{
|
|
pic_value val;
|
|
int c;
|
|
|
|
switch ((c = skip(port, ' '))) {
|
|
case '(': case '[':
|
|
{
|
|
pic_value tmp;
|
|
|
|
val = pic_cons(pic, pic_none_value(), pic_none_value());
|
|
|
|
xh_put_int(&pic->reader->labels, i, &val);
|
|
|
|
tmp = read(pic, port, c);
|
|
pic_pair_ptr(val)->car = pic_car(pic, tmp);
|
|
pic_pair_ptr(val)->cdr = pic_cdr(pic, tmp);
|
|
|
|
return val;
|
|
}
|
|
case '#':
|
|
{
|
|
bool vect;
|
|
|
|
if (peek(port) == '(') {
|
|
vect = true;
|
|
} else {
|
|
vect = false;
|
|
}
|
|
|
|
if (vect) {
|
|
pic_vec *tmp;
|
|
|
|
val = pic_obj_value(pic_make_vec(pic, 0));
|
|
|
|
xh_put_int(&pic->reader->labels, i, &val);
|
|
|
|
tmp = pic_vec_ptr(read(pic, port, c));
|
|
PIC_SWAP(pic_value *, tmp->data, pic_vec_ptr(val)->data);
|
|
PIC_SWAP(size_t, tmp->len, pic_vec_ptr(val)->len);
|
|
|
|
return val;
|
|
}
|
|
|
|
PIC_FALLTHROUGH;
|
|
}
|
|
default:
|
|
{
|
|
val = read(pic, port, c);
|
|
|
|
xh_put_int(&pic->reader->labels, i, &val);
|
|
|
|
return val;
|
|
}
|
|
}
|
|
}
|
|
|
|
static pic_value
|
|
read_label_ref(pic_state *pic, struct pic_port *port, int i)
|
|
{
|
|
xh_entry *e;
|
|
|
|
PIC_UNUSED(port);
|
|
|
|
e = xh_get_int(&pic->reader->labels, i);
|
|
if (! e) {
|
|
read_error(pic, "label of given index not defined");
|
|
}
|
|
return xh_val(e, pic_value);
|
|
}
|
|
|
|
static pic_value
|
|
read_label(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
int i;
|
|
|
|
i = 0;
|
|
do {
|
|
i = i * 10 + c - '0';
|
|
} while (isdigit(c = next(port)));
|
|
|
|
if (c == '=') {
|
|
return read_label_set(pic, port, i);
|
|
}
|
|
if (c == '#') {
|
|
return read_label_ref(pic, port, i);
|
|
}
|
|
read_error(pic, "broken label expression");
|
|
}
|
|
|
|
static pic_value
|
|
read_unmatch(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
PIC_UNUSED(port);
|
|
PIC_UNUSED(c);
|
|
|
|
read_error(pic, "unmatched parenthesis");
|
|
}
|
|
|
|
static pic_value
|
|
read_dispatch(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
c = next(port);
|
|
|
|
if (c == EOF) {
|
|
read_error(pic, "unexpected EOF");
|
|
}
|
|
|
|
if (pic->reader->dispatch[c] == NULL) {
|
|
read_error(pic, "invalid character at the seeker head");
|
|
}
|
|
|
|
return pic->reader->dispatch[c](pic, port, c);
|
|
}
|
|
|
|
static pic_value
|
|
read_nullable(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
c = skip(port, c);
|
|
|
|
if (c == EOF) {
|
|
read_error(pic, "unexpected EOF");
|
|
}
|
|
|
|
if (pic->reader->table[c] == NULL) {
|
|
read_error(pic, "invalid character at the seeker head");
|
|
}
|
|
|
|
return pic->reader->table[c](pic, port, c);
|
|
}
|
|
|
|
static pic_value
|
|
read(pic_state *pic, struct pic_port *port, int c)
|
|
{
|
|
pic_value val;
|
|
|
|
retry:
|
|
val = read_nullable(pic, port, c);
|
|
|
|
if (pic_undef_p(val)) {
|
|
c = next(port);
|
|
goto retry;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
void
|
|
pic_init_reader(pic_state *pic)
|
|
{
|
|
int c;
|
|
|
|
pic->reader->table[0] = NULL;
|
|
|
|
/* default reader */
|
|
for (c = 1; c < 256; ++c) {
|
|
pic->reader->table[c] = read_symbol;
|
|
}
|
|
|
|
pic->reader->table[')'] = read_unmatch;
|
|
pic->reader->table[';'] = read_comment;
|
|
pic->reader->table['\''] = read_quote;
|
|
pic->reader->table['`'] = read_quasiquote;
|
|
pic->reader->table[','] = read_unquote;
|
|
pic->reader->table['"'] = read_string;
|
|
pic->reader->table['|'] = read_pipe;
|
|
pic->reader->table['+'] = read_plus;
|
|
pic->reader->table['-'] = read_minus;
|
|
pic->reader->table['('] = read_pair;
|
|
pic->reader->table['['] = read_pair;
|
|
pic->reader->table['#'] = read_dispatch;
|
|
|
|
/* read number */
|
|
for (c = '0'; c <= '9'; ++c) {
|
|
pic->reader->table[c] = read_number;
|
|
}
|
|
|
|
/* default dispatch reader */
|
|
for (c = 0; c < 256; ++c) {
|
|
pic->reader->dispatch[c] = NULL;
|
|
}
|
|
|
|
pic->reader->dispatch['!'] = read_directive;
|
|
pic->reader->dispatch['|'] = read_block_comment;
|
|
pic->reader->dispatch[';'] = read_datum_comment;
|
|
pic->reader->dispatch['t'] = read_true;
|
|
pic->reader->dispatch['f'] = read_false;
|
|
pic->reader->dispatch['\\'] = read_char;
|
|
pic->reader->dispatch['('] = read_vector;
|
|
pic->reader->dispatch['u'] = read_blob;
|
|
pic->reader->dispatch['.'] = read_eval;
|
|
|
|
/* read labels */
|
|
for (c = '0'; c <= '9'; ++c) {
|
|
pic->reader->dispatch[c] = read_label;
|
|
}
|
|
}
|
|
|
|
pic_value
|
|
pic_read(pic_state *pic, struct pic_port *port)
|
|
{
|
|
pic_value val;
|
|
int c = next(port);
|
|
|
|
retry:
|
|
c = skip(port, c);
|
|
|
|
if (c == EOF) {
|
|
return pic_eof_object();
|
|
}
|
|
|
|
val = read_nullable(pic, port, c);
|
|
|
|
if (pic_undef_p(val)) {
|
|
c = next(port);
|
|
goto retry;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
pic_value
|
|
pic_read_cstr(pic_state *pic, const char *str)
|
|
{
|
|
struct pic_port *port;
|
|
|
|
port = pic_open_input_string(pic, str);
|
|
|
|
return pic_read(pic, port);
|
|
}
|
|
|
|
static pic_value
|
|
pic_read_read(pic_state *pic)
|
|
{
|
|
struct pic_port *port = pic_stdin(pic);
|
|
|
|
pic_get_args(pic, "|p", &port);
|
|
|
|
return pic_read(pic, port);
|
|
}
|
|
|
|
void
|
|
pic_init_read(pic_state *pic)
|
|
{
|
|
pic_defun(pic, "read", pic_read_read);
|
|
}
|