diff options
Diffstat (limited to 'src/string.c')
| -rw-r--r-- | src/string.c | 176 |
1 files changed, 173 insertions, 3 deletions
diff --git a/src/string.c b/src/string.c index c8a9e61ec..43bf8a841 100644 --- a/src/string.c +++ b/src/string.c @@ -427,13 +427,18 @@ mrb_str_byte_subseq(mrb_state *mrb, mrb_value str, mrb_int beg, mrb_int len) } return mrb_obj_value(s); } + +static void +str_range_to_bytes(mrb_value str, mrb_int *pos, mrb_int *len) +{ + *pos = chars2bytes(str, 0, *pos); + *len = chars2bytes(str, *pos, *len); +} #ifdef MRB_UTF8_STRING static inline mrb_value str_subseq(mrb_state *mrb, mrb_value str, mrb_int beg, mrb_int len) { - beg = chars2bytes(str, 0, beg); - len = chars2bytes(str, beg, len); - + str_range_to_bytes(str, &beg, &len); return mrb_str_byte_subseq(mrb, str, beg, len); } #else @@ -1010,6 +1015,68 @@ mrb_str_dup(mrb_state *mrb, mrb_value str) return str_replace(mrb, dup, s); } +enum str_convert_range { + /* `beg` and `len` are byte unit in `0 ... str.bytesize` */ + STR_BYTE_RANGE_CORRECTED = 1, + + /* `beg` and `len` are char unit in any range */ + STR_CHAR_RANGE = 2, + + /* `beg` and `len` are char unit in `0 ... str.size` */ + STR_CHAR_RANGE_CORRECTED = 3, + + /* `beg` is out of range */ + STR_OUT_OF_RANGE = -1 +}; + +static enum str_convert_range +str_convert_range(mrb_state *mrb, mrb_value str, mrb_value indx, mrb_value alen, mrb_int *beg, mrb_int *len) +{ + if (!mrb_undef_p(alen)) { + *beg = mrb_int(mrb, indx); + *len = mrb_int(mrb, alen); + return STR_CHAR_RANGE; + } + else { + switch (mrb_type(indx)) { + case MRB_TT_FIXNUM: + *beg = mrb_fixnum(indx); + *len = 1; + return STR_CHAR_RANGE; + + case MRB_TT_STRING: + *beg = str_index_str(mrb, str, indx, 0); + if (*beg < 0) { break; } + *len = RSTRING_LEN(indx); + return STR_BYTE_RANGE_CORRECTED; + + case MRB_TT_RANGE: + goto range_arg; + + default: + indx = mrb_to_int(mrb, indx); + if (mrb_fixnum_p(indx)) { + *beg = mrb_fixnum(indx); + *len = 1; + return STR_CHAR_RANGE; + } +range_arg: + *len = RSTRING_CHAR_LEN(str); + switch (mrb_range_beg_len(mrb, indx, beg, len, *len, TRUE)) { + case MRB_RANGE_OK: + return STR_CHAR_RANGE_CORRECTED; + case MRB_RANGE_OUT: + return STR_OUT_OF_RANGE; + default: + break; + } + + mrb_raise(mrb, E_TYPE_ERROR, "can't convert to Fixnum"); + } + } + return STR_OUT_OF_RANGE; +} + static mrb_value mrb_str_aref(mrb_state *mrb, mrb_value str, mrb_value indx) { @@ -1113,6 +1180,108 @@ mrb_str_aref_m(mrb_state *mrb, mrb_value str) return mrb_str_aref(mrb, str, a1); } +static mrb_noreturn void +str_out_of_index(mrb_state *mrb, mrb_value index) +{ + mrb_raisef(mrb, E_INDEX_ERROR, "index %S out of string", index); +} + +static mrb_value +str_replace_partial(mrb_state *mrb, mrb_value src, mrb_int pos, mrb_int end, mrb_value rep) +{ + const mrb_int shrink_threshold = 256; + struct RString *str = mrb_str_ptr(src); + mrb_int len = RSTR_LEN(str); + mrb_int replen, newlen; + char *strp; + + if (end > len) { end = len; } + + if (pos < 0 || pos > len) { + str_out_of_index(mrb, mrb_fixnum_value(pos)); + } + + replen = (mrb_nil_p(rep) ? 0 : RSTRING_LEN(rep)); + newlen = replen + len - (end - pos); + + if (newlen >= MRB_INT_MAX || newlen < replen /* overflowed */) { + mrb_raise(mrb, E_RUNTIME_ERROR, "string size too big"); + } + + mrb_str_modify(mrb, str); + + if (len < newlen || len - newlen >= shrink_threshold) { + resize_capa(mrb, str, newlen); + } + + strp = RSTR_PTR(str); + + memmove(strp + newlen - (len - end), strp + end, len - end); + if (!mrb_nil_p(rep)) { + memcpy(strp + pos, RSTRING_PTR(rep), replen); + } + RSTR_SET_LEN(str, newlen); + strp[newlen] = '\0'; + + return src; +} + +static void +mrb_str_aset(mrb_state *mrb, mrb_value str, mrb_value indx, mrb_value alen, mrb_value replace) +{ + mrb_int beg, len, charlen; + + replace = mrb_to_str(mrb, replace); + + switch (str_convert_range(mrb, str, indx, alen, &beg, &len)) { + case STR_OUT_OF_RANGE: + default: + mrb_raise(mrb, E_INDEX_ERROR, "string not matched"); + case STR_CHAR_RANGE: + if (len < 0) { + mrb_raisef(mrb, E_INDEX_ERROR, "negative length %S", alen); + } + charlen = RSTRING_CHAR_LEN(str); + if (beg < 0) { beg += charlen; } + if (beg < 0 || beg > charlen) { str_out_of_index(mrb, indx); } + /* fall through */ + case STR_CHAR_RANGE_CORRECTED: + str_range_to_bytes(str, &beg, &len); + /* fall through */ + case STR_BYTE_RANGE_CORRECTED: + str_replace_partial(mrb, str, beg, beg + len, replace); + } +} + +/* + * call-seq: + * str[fixnum] = replace + * str[fixnum, fixnum] = replace + * str[range] = replace + * str[regexp] = replace + * str[regexp, fixnum] = replace + * str[other_str] = replace + * + * Modify +self+ by replacing the content of +self+. + * The portion of the string affected is determined using the same criteria as +String#[]+. + */ +static mrb_value +mrb_str_aset_m(mrb_state *mrb, mrb_value str) +{ + mrb_value indx, alen, replace; + + switch (mrb_get_args(mrb, "oo|S!", &indx, &alen, &replace)) { + case 2: + replace = alen; + alen = mrb_undef_value(); + break; + case 3: + break; + } + mrb_str_aset(mrb, str, indx, alen, replace); + return str; +} + /* 15.2.10.5.8 */ /* * call-seq: @@ -2678,6 +2847,7 @@ mrb_init_string(mrb_state *mrb) mrb_define_method(mrb, s, "+", mrb_str_plus_m, MRB_ARGS_REQ(1)); /* 15.2.10.5.4 */ mrb_define_method(mrb, s, "*", mrb_str_times, MRB_ARGS_REQ(1)); /* 15.2.10.5.5 */ mrb_define_method(mrb, s, "[]", mrb_str_aref_m, MRB_ARGS_ANY()); /* 15.2.10.5.6 */ + mrb_define_method(mrb, s, "[]=", mrb_str_aset_m, MRB_ARGS_ANY()); mrb_define_method(mrb, s, "capitalize", mrb_str_capitalize, MRB_ARGS_NONE()); /* 15.2.10.5.7 */ mrb_define_method(mrb, s, "capitalize!", mrb_str_capitalize_bang, MRB_ARGS_NONE()); /* 15.2.10.5.8 */ mrb_define_method(mrb, s, "chomp", mrb_str_chomp, MRB_ARGS_ANY()); /* 15.2.10.5.9 */ |