diff options
Diffstat (limited to 'range.c')
| -rw-r--r-- | range.c | 61 |
1 files changed, 61 insertions, 0 deletions
@@ -11,6 +11,7 @@ #include "internal.h" #include "id.h" +#include <assert.h> #ifdef HAVE_FLOAT_H #include <float.h> @@ -1005,6 +1006,58 @@ range_first(int argc, VALUE *argv, VALUE range) return ary[1]; } +static VALUE +rb_int_range_last(int argc, VALUE *argv, VALUE range) +{ + static const VALUE ONE = INT2FIX(1); + + VALUE b, e, len_1, len, nv, ary; + int x; + long n; + + assert(argc > 0); + + b = RANGE_BEG(range); + e = RANGE_END(range); + assert(RB_INTEGER_TYPE_P(b) && RB_INTEGER_TYPE_P(e)); + + x = EXCL(range); + + len_1 = rb_int_minus(e, b); + if (FIXNUM_ZERO_P(len_1) || rb_num_negative_p(len_1)) { + return rb_ary_new_capa(0); + } + + if (x) { + e = rb_int_minus(e, ONE); + len = len_1; + } + else { + len = rb_int_plus(len_1, ONE); + } + + rb_scan_args(argc, argv, "1", &nv); + n = NUM2LONG(nv); + if (n < 0) { + rb_raise(rb_eArgError, "negative array size"); + } + + nv = LONG2NUM(n); + if (RTEST(rb_int_gt(nv, len))) { + nv = len; + n = NUM2LONG(nv); + } + + ary = rb_ary_new_capa(n); + b = rb_int_minus(e, nv); + while (n) { + b = rb_int_plus(b, ONE); + rb_ary_push(ary, b); + --n; + } + + return ary; +} /* * call-seq: @@ -1026,10 +1079,18 @@ range_first(int argc, VALUE *argv, VALUE range) static VALUE range_last(int argc, VALUE *argv, VALUE range) { + VALUE b, e; + if (NIL_P(RANGE_END(range))) { rb_raise(rb_eRangeError, "cannot get the last element of endless range"); } if (argc == 0) return RANGE_END(range); + + b = RANGE_BEG(range); + e = RANGE_END(range); + if (RB_INTEGER_TYPE_P(b) && RB_INTEGER_TYPE_P(e)) { + return rb_int_range_last(argc, argv, range); + } return rb_ary_last(argc, argv, rb_Array(range)); } |