VALUE
rb_str_inspect(VALUE str)
{
rb_encoding *enc = STR_ENC_GET(str);
const char *p, *pend, *prev;
char buf[CHAR_ESC_LEN + 1];
VALUE result = rb_str_buf_new(0);
rb_encoding *resenc = rb_default_internal_encoding();
int unicode_p = rb_enc_unicode_p(enc);
int asciicompat = rb_enc_asciicompat(enc);
if (resenc == NULL) resenc = rb_default_external_encoding();
if (!rb_enc_asciicompat(resenc)) resenc = rb_usascii_encoding();
rb_enc_associate(result, resenc);
str_buf_cat2(result, "\"");
p = RSTRING_PTR(str); pend = RSTRING_END(str);
prev = p;
while (p < pend) {
unsigned int c, cc;
int n;
n = rb_enc_precise_mbclen(p, pend, enc);
if (!MBCLEN_CHARFOUND_P(n)) {
if (p > prev) str_buf_cat(result, prev, p - prev);
n = rb_enc_mbminlen(enc);
if (pend < p + n)
n = (int)(pend - p);
while (n--) {
snprintf(buf, CHAR_ESC_LEN, "\\x%02X", *p & 0377);
str_buf_cat(result, buf, strlen(buf));
prev = ++p;
}
continue;
}
n = MBCLEN_CHARFOUND_LEN(n);
c = rb_enc_mbc_to_codepoint(p, pend, enc);
p += n;
if (c == '"'|| c == '\\' ||
(c == '#' &&
p < pend &&
MBCLEN_CHARFOUND_P(rb_enc_precise_mbclen(p,pend,enc)) &&
(cc = rb_enc_codepoint(p,pend,enc),
(cc == '$' || cc == '@' || cc == '{')))) {
if (p - n > prev) str_buf_cat(result, prev, p - n - prev);
str_buf_cat2(result, "\\");
if (asciicompat || enc == resenc) {
prev = p - n;
continue;
}
}
switch (c) {
case '\n': cc = 'n'; break;
case '\r': cc = 'r'; break;
case '\t': cc = 't'; break;
case '\f': cc = 'f'; break;
case '\013': cc = 'v'; break;
case '\010': cc = 'b'; break;
case '\007': cc = 'a'; break;
case 033: cc = 'e'; break;
default: cc = 0; break;
}
if (cc) {
if (p - n > prev) str_buf_cat(result, prev, p - n - prev);
buf[0] = '\\';
buf[1] = (char)cc;
str_buf_cat(result, buf, 2);
prev = p;
continue;
}
if ((enc == resenc && rb_enc_isprint(c, enc)) ||
(asciicompat && rb_enc_isascii(c, enc) && ISPRINT(c))) {
continue;
}
else {
if (p - n > prev) str_buf_cat(result, prev, p - n - prev);
rb_str_buf_cat_escaped_char(result, c, unicode_p);
prev = p;
continue;
}
}
if (p > prev) str_buf_cat(result, prev, p - prev);
str_buf_cat2(result, "\"");
OBJ_INFECT(result, str);
return result;
}