Created
February 12, 2012 10:07
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static VALUE | |
rb_str_each_line(int argc, VALUE *argv, VALUE str) | |
{ | |
rb_encoding *enc; | |
VALUE rs; | |
unsigned int newline; | |
const char *p, *pend, *s, *ptr; | |
long len, rslen; | |
VALUE line; | |
int n; | |
VALUE orig = str; | |
if (argc == 0) { | |
rs = rb_rs; | |
} | |
else { | |
rb_scan_args(argc, argv, "01", &rs); | |
} | |
RETURN_ENUMERATOR(str, argc, argv); | |
if (NIL_P(rs)) { | |
rb_yield(str); | |
return orig; | |
} | |
str = rb_str_new4(str); | |
ptr = p = s = RSTRING_PTR(str); | |
pend = p + RSTRING_LEN(str); | |
len = RSTRING_LEN(str); | |
StringValue(rs); | |
if (rs == rb_default_rs) { | |
enc = rb_enc_get(str); | |
while (p < pend) { | |
char *p0; | |
p = memchr(p, '\n', pend - p); | |
if (!p) break; | |
p0 = rb_enc_left_char_head(s, p, pend, enc); | |
if (!rb_enc_is_newline(p0, pend, enc)) { | |
p++; | |
continue; | |
} | |
p = p0 + rb_enc_mbclen(p0, pend, enc); | |
line = rb_str_new5(str, s, p - s); | |
OBJ_INFECT(line, str); | |
rb_enc_cr_str_copy_for_substr(line, str); | |
rb_yield(line); | |
str_mod_check(str, ptr, len); | |
s = p; | |
} | |
goto finish; | |
} | |
enc = rb_enc_check(str, rs); | |
rslen = RSTRING_LEN(rs); | |
if (rslen == 0) { | |
newline = '\n'; | |
} | |
else { | |
newline = rb_enc_codepoint(RSTRING_PTR(rs), RSTRING_END(rs), enc); | |
} | |
while (p < pend) { | |
unsigned int c = rb_enc_codepoint_len(p, pend, &n, enc); | |
again: | |
if (rslen == 0 && c == newline) { | |
p += n; | |
if (p < pend && (c = rb_enc_codepoint_len(p, pend, &n, enc)) != newline) { | |
goto again; | |
} | |
while (p < pend && rb_enc_codepoint(p, pend, enc) == newline) { | |
p += n; | |
} | |
p -= n; | |
} | |
if (c == newline && | |
(rslen <= 1 || memcmp(RSTRING_PTR(rs), p, rslen) == 0)) { | |
line = rb_str_new5(str, s, p - s + (rslen ? rslen : n)); | |
OBJ_INFECT(line, str); | |
rb_enc_cr_str_copy_for_substr(line, str); | |
rb_yield(line); | |
str_mod_check(str, ptr, len); | |
s = p + (rslen ? rslen : n); | |
} | |
p += n; | |
} | |
finish: | |
if (s != pend) { | |
line = rb_str_new5(str, s, pend - s); | |
OBJ_INFECT(line, str); | |
rb_enc_cr_str_copy_for_substr(line, str); | |
rb_yield(line); | |
} | |
return orig; | |
} |
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