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range.c
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/**********************************************************************
range.c -
$Author$
created at: Thu Aug 19 17:46:47 JST 1993
Copyright (C) 1993-2007 Yukihiro Matsumoto
**********************************************************************/
#include "internal.h"
#include "id.h"
#ifdef HAVE_FLOAT_H
#include <float.h>
#endif
#include <math.h>
VALUE rb_cRange;
static ID id_beg, id_end, id_excl;
#define id_cmp idCmp
#define id_succ idSucc
static VALUE r_cover_p(VALUE, VALUE, VALUE, VALUE);
#define RANGE_BEG(r) (RSTRUCT(r)->as.ary[0])
#define RANGE_END(r) (RSTRUCT(r)->as.ary[1])
#define RANGE_EXCL(r) (RSTRUCT(r)->as.ary[2])
#define RANGE_SET_BEG(r, v) (RSTRUCT_SET(r, 0, v))
#define RANGE_SET_END(r, v) (RSTRUCT_SET(r, 1, v))
#define RANGE_SET_EXCL(r, v) (RSTRUCT_SET(r, 2, v))
#define RBOOL(v) ((v) ? Qtrue : Qfalse)
#define EXCL(r) RTEST(RANGE_EXCL(r))
static void
range_init(VALUE range, VALUE beg, VALUE end, VALUE exclude_end)
{
if ((!FIXNUM_P(beg) || !FIXNUM_P(end)) && !NIL_P(end)) {
VALUE v;
v = rb_funcall(beg, id_cmp, 1, end);
if (NIL_P(v))
rb_raise(rb_eArgError, "bad value for range");
}
RANGE_SET_EXCL(range, exclude_end);
RANGE_SET_BEG(range, beg);
RANGE_SET_END(range, end);
}
VALUE
rb_range_new(VALUE beg, VALUE end, int exclude_end)
{
VALUE range = rb_obj_alloc(rb_cRange);
range_init(range, beg, end, RBOOL(exclude_end));
return range;
}
static void
range_modify(VALUE range)
{
rb_check_frozen(range);
/* Ranges are immutable, so that they should be initialized only once. */
if (RANGE_EXCL(range) != Qnil) {
rb_name_err_raise("`initialize' called twice", range, ID2SYM(idInitialize));
}
}
/*
* call-seq:
* Range.new(begin, end, exclude_end=false) -> rng
*
* Constructs a range using the given +begin+ and +end+. If the +exclude_end+
* parameter is omitted or is <code>false</code>, the range will include
* the end object; otherwise, it will be excluded.
*/
static VALUE
range_initialize(int argc, VALUE *argv, VALUE range)
{
VALUE beg, end, flags;
rb_scan_args(argc, argv, "21", &beg, &end, &flags);
range_modify(range);
range_init(range, beg, end, RBOOL(RTEST(flags)));
return Qnil;
}
/* :nodoc: */
static VALUE
range_initialize_copy(VALUE range, VALUE orig)
{
range_modify(range);
rb_struct_init_copy(range, orig);
return range;
}
/*
* call-seq:
* rng.exclude_end? -> true or false
*
* Returns <code>true</code> if the range excludes its end value.
*
* (1..5).exclude_end? #=> false
* (1...5).exclude_end? #=> true
*/
static VALUE
range_exclude_end_p(VALUE range)
{
return EXCL(range) ? Qtrue : Qfalse;
}
static VALUE
recursive_equal(VALUE range, VALUE obj, int recur)
{
if (recur) return Qtrue; /* Subtle! */
if (!rb_equal(RANGE_BEG(range), RANGE_BEG(obj)))
return Qfalse;
if (!rb_equal(RANGE_END(range), RANGE_END(obj)))
return Qfalse;
if (EXCL(range) != EXCL(obj))
return Qfalse;
return Qtrue;
}
/*
* call-seq:
* rng == obj -> true or false
*
* Returns <code>true</code> only if +obj+ is a Range, has equivalent
* begin and end items (by comparing them with <code>==</code>), and has
* the same #exclude_end? setting as the range.
*
* (0..2) == (0..2) #=> true
* (0..2) == Range.new(0,2) #=> true
* (0..2) == (0...2) #=> false
*
*/
static VALUE
range_eq(VALUE range, VALUE obj)
{
if (range == obj)
return Qtrue;
if (!rb_obj_is_kind_of(obj, rb_cRange))
return Qfalse;
return rb_exec_recursive_paired(recursive_equal, range, obj, obj);
}
/* compares _a_ and _b_ and returns:
* < 0: a < b
* = 0: a = b
* > 0: a > b or non-comparable
*/
static int
r_less(VALUE a, VALUE b)
{
VALUE r = rb_funcall(a, id_cmp, 1, b);
if (NIL_P(r))
return INT_MAX;
return rb_cmpint(r, a, b);
}
static VALUE
recursive_eql(VALUE range, VALUE obj, int recur)
{
if (recur) return Qtrue; /* Subtle! */
if (!rb_eql(RANGE_BEG(range), RANGE_BEG(obj)))
return Qfalse;
if (!rb_eql(RANGE_END(range), RANGE_END(obj)))
return Qfalse;
if (EXCL(range) != EXCL(obj))
return Qfalse;
return Qtrue;
}
/*
* call-seq:
* rng.eql?(obj) -> true or false
*
* Returns <code>true</code> only if +obj+ is a Range, has equivalent
* begin and end items (by comparing them with <code>eql?</code>),
* and has the same #exclude_end? setting as the range.
*
* (0..2).eql?(0..2) #=> true
* (0..2).eql?(Range.new(0,2)) #=> true
* (0..2).eql?(0...2) #=> false
*
*/
static VALUE
range_eql(VALUE range, VALUE obj)
{
if (range == obj)
return Qtrue;
if (!rb_obj_is_kind_of(obj, rb_cRange))
return Qfalse;
return rb_exec_recursive_paired(recursive_eql, range, obj, obj);
}
/*
* call-seq:
* rng.hash -> integer
*
* Compute a hash-code for this range. Two ranges with equal
* begin and end points (using <code>eql?</code>), and the same
* #exclude_end? value will generate the same hash-code.
*
* See also Object#hash.
*/
static VALUE
range_hash(VALUE range)
{
st_index_t hash = EXCL(range);
VALUE v;
hash = rb_hash_start(hash);
v = rb_hash(RANGE_BEG(range));
hash = rb_hash_uint(hash, NUM2LONG(v));
v = rb_hash(RANGE_END(range));
hash = rb_hash_uint(hash, NUM2LONG(v));
hash = rb_hash_uint(hash, EXCL(range) << 24);
hash = rb_hash_end(hash);
return LONG2FIX(hash);
}
static void
range_each_func(VALUE range, int (*func)(VALUE, VALUE), VALUE arg)
{
int c;
VALUE b = RANGE_BEG(range);
VALUE e = RANGE_END(range);
VALUE v = b;
if (EXCL(range)) {
while (r_less(v, e) < 0) {
if ((*func)(v, arg)) break;
v = rb_funcallv(v, id_succ, 0, 0);
}
}
else {
while ((c = r_less(v, e)) <= 0) {
if ((*func)(v, arg)) break;;
if (!c) break;
v = rb_funcallv(v, id_succ, 0, 0);
}
}
}
static int
sym_step_i(VALUE i, VALUE arg)
{
VALUE *iter = (VALUE *)arg;
if (FIXNUM_P(iter[0])) {
iter[0] -= INT2FIX(1) & ~FIXNUM_FLAG;
}
else {
iter[0] = rb_funcall(iter[0], '-', 1, INT2FIX(1));
}
if (iter[0] == INT2FIX(0)) {
rb_yield(rb_str_intern(i));
iter[0] = iter[1];
}
return 0;
}
static int
step_i(VALUE i, VALUE arg)
{
VALUE *iter = (VALUE *)arg;
if (FIXNUM_P(iter[0])) {
iter[0] -= INT2FIX(1) & ~FIXNUM_FLAG;
}
else {
iter[0] = rb_funcall(iter[0], '-', 1, INT2FIX(1));
}
if (iter[0] == INT2FIX(0)) {
rb_yield(i);
iter[0] = iter[1];
}
return 0;
}
static int
discrete_object_p(VALUE obj)
{
if (rb_obj_is_kind_of(obj, rb_cTime)) return FALSE; /* until Time#succ removed */
return rb_respond_to(obj, id_succ);
}
static int
linear_object_p(VALUE obj)
{
if (FIXNUM_P(obj) || FLONUM_P(obj)) return TRUE;
if (SPECIAL_CONST_P(obj)) return FALSE;
switch (BUILTIN_TYPE(obj)) {
case T_FLOAT:
case T_BIGNUM:
return TRUE;
}
if (rb_obj_is_kind_of(obj, rb_cNumeric)) return TRUE;
if (rb_obj_is_kind_of(obj, rb_cTime)) return TRUE;
return FALSE;
}
static VALUE
check_step_domain(VALUE step)
{
VALUE zero = INT2FIX(0);
int cmp;
if (!rb_obj_is_kind_of(step, rb_cNumeric)) {
step = rb_to_int(step);
}
cmp = rb_cmpint(rb_funcallv(step, idCmp, 1, &zero), step, zero);
if (cmp < 0) {
rb_raise(rb_eArgError, "step can't be negative");
}
else if (cmp == 0) {
rb_raise(rb_eArgError, "step can't be 0");
}
return step;
}
static VALUE
range_step_size(VALUE range, VALUE args, VALUE eobj)
{
VALUE b = RANGE_BEG(range), e = RANGE_END(range);
VALUE step = INT2FIX(1);
if (args) {
step = check_step_domain(RARRAY_AREF(args, 0));
}
if (rb_obj_is_kind_of(b, rb_cNumeric) && rb_obj_is_kind_of(e, rb_cNumeric)) {
return ruby_num_interval_step_size(b, e, step, EXCL(range));
}
return Qnil;
}
/*
* call-seq:
* rng.step(n=1) {| obj | block } -> rng
* rng.step(n=1) -> an_enumerator
*
* Iterates over the range, passing each <code>n</code>th element to the block.
* If begin and end are numeric, +n+ is added for each iteration.
* Otherwise <code>step</code> invokes <code>succ</code> to iterate through
* range elements.
*
* If no block is given, an enumerator is returned instead.
*
* range = Xs.new(1)..Xs.new(10)
* range.step(2) {|x| puts x}
* puts
* range.step(3) {|x| puts x}
*
* <em>produces:</em>
*
* 1 x
* 3 xxx
* 5 xxxxx
* 7 xxxxxxx
* 9 xxxxxxxxx
*
* 1 x
* 4 xxxx
* 7 xxxxxxx
* 10 xxxxxxxxxx
*
* See Range for the definition of class Xs.
*/
static VALUE
range_step(int argc, VALUE *argv, VALUE range)
{
VALUE b, e, step, tmp;
b = RANGE_BEG(range);
e = RANGE_END(range);
if (argc == 0) {
step = INT2FIX(1);
}
else {
rb_scan_args(argc, argv, "01", &step);
}
if (!rb_block_given_p()) {
if (rb_obj_is_kind_of(b, rb_cNumeric) && (NIL_P(e) || rb_obj_is_kind_of(e, rb_cNumeric))) {
return rb_arith_seq_new(range, ID2SYM(rb_frame_this_func()), argc, argv,
range_step_size, b, e, step, EXCL(range));
}
RETURN_SIZED_ENUMERATOR(range, argc, argv, range_step_size);
}
step = check_step_domain(step);
if (FIXNUM_P(b) && NIL_P(e) && FIXNUM_P(step)) {
long i = FIX2LONG(b), unit = FIX2LONG(step);
do {
rb_yield(LONG2FIX(i));
i += unit; /* FIXABLE+FIXABLE never overflow */
} while (FIXABLE(i));
b = LONG2NUM(i);
for (;; b = rb_big_plus(b, step))
rb_yield(b);
}
else if (FIXNUM_P(b) && FIXNUM_P(e) && FIXNUM_P(step)) { /* fixnums are special */
long end = FIX2LONG(e);
long i, unit = FIX2LONG(step);
if (!EXCL(range))
end += 1;
i = FIX2LONG(b);
while (i < end) {
rb_yield(LONG2NUM(i));
if (i + unit < i) break;
i += unit;
}
}
else if (SYMBOL_P(b) && (NIL_P(e) || SYMBOL_P(e))) { /* symbols are special */
VALUE iter[2];
iter[0] = INT2FIX(1);
iter[1] = step;
b = rb_sym2str(b);
if (NIL_P(e)) {
rb_str_upto_endless_each(b, sym_step_i, (VALUE)iter);
}
else {
rb_str_upto_each(b, rb_sym2str(e), EXCL(range), sym_step_i, (VALUE)iter);
}
}
else if (ruby_float_step(b, e, step, EXCL(range), TRUE)) {
/* done */
}
else if (rb_obj_is_kind_of(b, rb_cNumeric) ||
!NIL_P(rb_check_to_integer(b, "to_int")) ||
!NIL_P(rb_check_to_integer(e, "to_int"))) {
ID op = EXCL(range) ? '<' : idLE;
VALUE v = b;
int i = 0;
while (NIL_P(e) || RTEST(rb_funcall(v, op, 1, e))) {
rb_yield(v);
i++;
v = rb_funcall(b, '+', 1, rb_funcall(INT2NUM(i), '*', 1, step));
}
}
else {
tmp = rb_check_string_type(b);
if (!NIL_P(tmp)) {
VALUE iter[2];
b = tmp;
iter[0] = INT2FIX(1);
iter[1] = step;
if (NIL_P(e)) {
rb_str_upto_endless_each(b, step_i, (VALUE)iter);
}
else {
rb_str_upto_each(b, e, EXCL(range), step_i, (VALUE)iter);
}
}
else {
VALUE args[2];
if (!discrete_object_p(b)) {
rb_raise(rb_eTypeError, "can't iterate from %s",
rb_obj_classname(b));
}
args[0] = INT2FIX(1);
args[1] = step;
range_each_func(range, step_i, (VALUE)args);
}
}
return range;
}
#if SIZEOF_DOUBLE == 8 && defined(HAVE_INT64_T)
union int64_double {
int64_t i;
double d;
};
static VALUE
int64_as_double_to_num(int64_t i)
{
union int64_double convert;
if (i < 0) {
convert.i = -i;
return DBL2NUM(-convert.d);
}
else {
convert.i = i;
return DBL2NUM(convert.d);
}
}
static int64_t
double_as_int64(double d)
{
union int64_double convert;
convert.d = fabs(d);
return d < 0 ? -convert.i : convert.i;
}
#endif
static int
is_integer_p(VALUE v)
{
ID id_integer_p;
VALUE is_int;
CONST_ID(id_integer_p, "integer?");
is_int = rb_check_funcall(v, id_integer_p, 0, 0);
return RTEST(is_int) && is_int != Qundef;
}
static VALUE
bsearch_integer_range(VALUE beg, VALUE end, int excl)
{
VALUE satisfied = Qnil;
int smaller;
#define BSEARCH_CHECK(expr) \
do { \
VALUE val = (expr); \
VALUE v = rb_yield(val); \
if (FIXNUM_P(v)) { \
if (v == INT2FIX(0)) return val; \
smaller = (SIGNED_VALUE)v < 0; \
} \
else if (v == Qtrue) { \
satisfied = val; \
smaller = 1; \
} \
else if (v == Qfalse || v == Qnil) { \
smaller = 0; \
} \
else if (rb_obj_is_kind_of(v, rb_cNumeric)) { \
int cmp = rb_cmpint(rb_funcall(v, id_cmp, 1, INT2FIX(0)), v, INT2FIX(0)); \
if (!cmp) return val; \
smaller = cmp < 0; \
} \
else { \
rb_raise(rb_eTypeError, "wrong argument type %"PRIsVALUE \
" (must be numeric, true, false or nil)", \
rb_obj_class(v)); \
} \
} while (0)
VALUE low = rb_to_int(beg);
VALUE high = rb_to_int(end);
VALUE mid, org_high;
ID id_div;
CONST_ID(id_div, "div");
if (excl) high = rb_funcall(high, '-', 1, INT2FIX(1));
org_high = high;
while (rb_cmpint(rb_funcall(low, id_cmp, 1, high), low, high) < 0) {
mid = rb_funcall(rb_funcall(high, '+', 1, low), id_div, 1, INT2FIX(2));
BSEARCH_CHECK(mid);
if (smaller) {
high = mid;
}
else {
low = rb_funcall(mid, '+', 1, INT2FIX(1));
}
}
if (rb_equal(low, org_high)) {
BSEARCH_CHECK(low);
if (!smaller) return Qnil;
}
return satisfied;
}
/*
* call-seq:
* rng.bsearch {|obj| block } -> value
*
* By using binary search, finds a value in range which meets the given
* condition in O(log n) where n is the size of the range.
*
* You can use this method in two use cases: a find-minimum mode and
* a find-any mode. In either case, the elements of the range must be
* monotone (or sorted) with respect to the block.
*
* In find-minimum mode (this is a good choice for typical use case),
* the block must return true or false, and there must be a value x
* so that:
*
* - the block returns false for any value which is less than x, and
* - the block returns true for any value which is greater than or
* equal to x.
*
* If x is within the range, this method returns the value x.
* Otherwise, it returns nil.
*
* ary = [0, 4, 7, 10, 12]
* (0...ary.size).bsearch {|i| ary[i] >= 4 } #=> 1
* (0...ary.size).bsearch {|i| ary[i] >= 6 } #=> 2
* (0...ary.size).bsearch {|i| ary[i] >= 8 } #=> 3
* (0...ary.size).bsearch {|i| ary[i] >= 100 } #=> nil
*
* (0.0...Float::INFINITY).bsearch {|x| Math.log(x) >= 0 } #=> 1.0
*
* In find-any mode (this behaves like libc's bsearch(3)), the block
* must return a number, and there must be two values x and y (x <= y)
* so that:
*
* - the block returns a positive number for v if v < x,
* - the block returns zero for v if x <= v < y, and
* - the block returns a negative number for v if y <= v.
*
* This method returns any value which is within the intersection of
* the given range and x...y (if any). If there is no value that
* satisfies the condition, it returns nil.
*
* ary = [0, 100, 100, 100, 200]
* (0..4).bsearch {|i| 100 - ary[i] } #=> 1, 2 or 3
* (0..4).bsearch {|i| 300 - ary[i] } #=> nil
* (0..4).bsearch {|i| 50 - ary[i] } #=> nil
*
* You must not mix the two modes at a time; the block must always
* return either true/false, or always return a number. It is
* undefined which value is actually picked up at each iteration.
*/
static VALUE
range_bsearch(VALUE range)
{
VALUE beg, end, satisfied = Qnil;
int smaller;
/* Implementation notes:
* Floats are handled by mapping them to 64 bits integers.
* Apart from sign issues, floats and their 64 bits integer have the
* same order, assuming they are represented as exponent followed
* by the mantissa. This is true with or without implicit bit.
*
* Finding the average of two ints needs to be careful about
* potential overflow (since float to long can use 64 bits)
* as well as the fact that -1/2 can be 0 or -1 in C89.
*
* Note that -0.0 is mapped to the same int as 0.0 as we don't want
* (-1...0.0).bsearch to yield -0.0.
*/
#define BSEARCH(conv) \
do { \
RETURN_ENUMERATOR(range, 0, 0); \
if (EXCL(range)) high--; \
org_high = high; \
while (low < high) { \
mid = ((high < 0) == (low < 0)) ? low + ((high - low) / 2) \
: (low < -high) ? -((-1 - low - high)/2 + 1) : (low + high) / 2; \
BSEARCH_CHECK(conv(mid)); \
if (smaller) { \
high = mid; \
} \
else { \
low = mid + 1; \
} \
} \
if (low == org_high) { \
BSEARCH_CHECK(conv(low)); \
if (!smaller) return Qnil; \
} \
return satisfied; \
} while (0)
beg = RANGE_BEG(range);
end = RANGE_END(range);
if (FIXNUM_P(beg) && FIXNUM_P(end)) {
long low = FIX2LONG(beg);
long high = FIX2LONG(end);
long mid, org_high;
BSEARCH(INT2FIX);
}
#if SIZEOF_DOUBLE == 8 && defined(HAVE_INT64_T)
else if (RB_TYPE_P(beg, T_FLOAT) || RB_TYPE_P(end, T_FLOAT)) {
int64_t low = double_as_int64(RFLOAT_VALUE(rb_Float(beg)));
int64_t high = double_as_int64(NIL_P(end) ? HUGE_VAL : RFLOAT_VALUE(rb_Float(end)));
int64_t mid, org_high;
BSEARCH(int64_as_double_to_num);
}
#endif
else if (is_integer_p(beg) && is_integer_p(end)) {
RETURN_ENUMERATOR(range, 0, 0);
return bsearch_integer_range(beg, end, EXCL(range));
}
else if (is_integer_p(beg) && NIL_P(end)) {
VALUE diff = LONG2FIX(1);
RETURN_ENUMERATOR(range, 0, 0);
while (1) {
VALUE mid = rb_funcall(beg, '+', 1, diff);
BSEARCH_CHECK(mid);
if (smaller) {
return bsearch_integer_range(beg, mid, 0);
}
diff = rb_funcall(diff, '*', 1, LONG2FIX(2));
}
}
else {
rb_raise(rb_eTypeError, "can't do binary search for %s", rb_obj_classname(beg));
}
return range;
}
static int
each_i(VALUE v, VALUE arg)
{
rb_yield(v);
return 0;
}
static int
sym_each_i(VALUE v, VALUE arg)
{
rb_yield(rb_str_intern(v));
return 0;
}
/*
* call-seq:
* rng.size -> num
*
* Returns the number of elements in the range. Both the begin and the end of
* the Range must be Numeric, otherwise nil is returned.
*
* (10..20).size #=> 11
* ('a'..'z').size #=> nil
* (-Float::INFINITY..Float::INFINITY).size #=> Infinity
*/
static VALUE
range_size(VALUE range)
{
VALUE b = RANGE_BEG(range), e = RANGE_END(range);
if (rb_obj_is_kind_of(b, rb_cNumeric)) {
if (rb_obj_is_kind_of(e, rb_cNumeric)) {
return ruby_num_interval_step_size(b, e, INT2FIX(1), EXCL(range));
}
if (NIL_P(e)) {
return DBL2NUM(HUGE_VAL);
}
}
return Qnil;
}
/*
* call-seq:
* rng.to_a -> array
* rng.entries -> array
*
* Returns an array containing the items in the range.
*
* (1..7).to_a #=> [1, 2, 3, 4, 5, 6, 7]
* (1..).to_a #=> RangeError: cannot convert endless range to an array
*/
static VALUE
range_to_a(VALUE range)
{
if (NIL_P(RANGE_END(range))) {
rb_raise(rb_eRangeError, "cannot convert endless range to an array");
}
return rb_call_super(0, 0);
}
static VALUE
range_enum_size(VALUE range, VALUE args, VALUE eobj)
{
return range_size(range);
}
/*
* call-seq:
* rng.each {| i | block } -> rng
* rng.each -> an_enumerator
*
* Iterates over the elements of range, passing each in turn to the
* block.
*
* The +each+ method can only be used if the begin object of the range
* supports the +succ+ method. A TypeError is raised if the object
* does not have +succ+ method defined (like Float).
*
* If no block is given, an enumerator is returned instead.
*
* (10..15).each {|n| print n, ' ' }
* # prints: 10 11 12 13 14 15
*
* (2.5..5).each {|n| print n, ' ' }
* # raises: TypeError: can't iterate from Float
*/
static VALUE
range_each(VALUE range)
{
VALUE beg, end;
long i, lim;
RETURN_SIZED_ENUMERATOR(range, 0, 0, range_enum_size);
beg = RANGE_BEG(range);
end = RANGE_END(range);
if (FIXNUM_P(beg) && NIL_P(end)) {
fixnum_endless:
i = FIX2LONG(beg);
while (FIXABLE(i)) {
rb_yield(LONG2FIX(i++));
}
beg = LONG2NUM(i);
bignum_endless:
for (;; beg = rb_big_plus(beg, INT2FIX(1)))
rb_yield(beg);
}
else if (FIXNUM_P(beg) && FIXNUM_P(end)) { /* fixnums are special */
fixnum_loop:
lim = FIX2LONG(end);
if (!EXCL(range))
lim += 1;
for (i = FIX2LONG(beg); i < lim; i++) {
rb_yield(LONG2FIX(i));
}
}
else if (RB_INTEGER_TYPE_P(beg) && (NIL_P(end) || RB_INTEGER_TYPE_P(end))) {
if (SPECIAL_CONST_P(end) || RBIGNUM_POSITIVE_P(end)) { /* end >= FIXNUM_MIN */
if (!FIXNUM_P(beg)) {
if (RBIGNUM_NEGATIVE_P(beg)) {
do {
rb_yield(beg);
} while (!FIXNUM_P(beg = rb_big_plus(beg, INT2FIX(1))));
if (NIL_P(end)) goto fixnum_endless;
if (FIXNUM_P(end)) goto fixnum_loop;
}
else {
if (NIL_P(end)) goto bignum_endless;
if (FIXNUM_P(end)) return range;
}
}
if (FIXNUM_P(beg)) {
i = FIX2LONG(beg);
do {
rb_yield(LONG2FIX(i));
} while (POSFIXABLE(++i));
beg = LONG2NUM(i);
}
ASSUME(!FIXNUM_P(beg));
ASSUME(!SPECIAL_CONST_P(end));
}
if (!FIXNUM_P(beg) && RBIGNUM_SIGN(beg) == RBIGNUM_SIGN(end)) {
if (EXCL(range)) {
while (rb_big_cmp(beg, end) == INT2FIX(-1)) {
rb_yield(beg);
beg = rb_big_plus(beg, INT2FIX(1));
}
}
else {
VALUE c;
while ((c = rb_big_cmp(beg, end)) != INT2FIX(1)) {
rb_yield(beg);
if (c == INT2FIX(0)) break;
beg = rb_big_plus(beg, INT2FIX(1));
}
}
}
}
else if (SYMBOL_P(beg) && (NIL_P(end) || SYMBOL_P(end))) { /* symbols are special */
beg = rb_sym2str(beg);
if (NIL_P(end)) {
rb_str_upto_endless_each(beg, sym_each_i, 0);
}
else {
rb_str_upto_each(beg, rb_sym2str(end), EXCL(range), sym_each_i, 0);
}
}
else {
VALUE tmp = rb_check_string_type(beg);
if (!NIL_P(tmp)) {
if (!NIL_P(end)) {
rb_str_upto_each(tmp, end, EXCL(range), each_i, 0);
}
else {
rb_str_upto_endless_each(tmp, each_i, 0);
}
}
else {
if (!discrete_object_p(beg)) {
rb_raise(rb_eTypeError, "can't iterate from %s",
rb_obj_classname(beg));
}
if (!NIL_P(end))
range_each_func(range, each_i, 0);
else
for (;; beg = rb_funcallv(beg, id_succ, 0, 0))
rb_yield(beg);
}
}
return range;
}
/*
* call-seq:
* rng.begin -> obj
*
* Returns the object that defines the beginning of the range.
*
* (1..10).begin #=> 1
*/
static VALUE
range_begin(VALUE range)
{
return RANGE_BEG(range);
}
/*
* call-seq:
* rng.end -> obj
*
* Returns the object that defines the end of the range.
*
* (1..10).end #=> 10
* (1...10).end #=> 10
*/
static VALUE
range_end(VALUE range)
{
return RANGE_END(range);
}
static VALUE
first_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, cbarg))
{
VALUE *ary = (VALUE *)cbarg;
long n = NUM2LONG(ary[0]);
if (n <= 0) {
rb_iter_break();
}
rb_ary_push(ary[1], i);
n--;
ary[0] = INT2NUM(n);
return Qnil;
}
/*
* call-seq:
* rng.first -> obj
* rng.first(n) -> an_array
*
* Returns the first object in the range, or an array of the first +n+
* elements.
*
* (10..20).first #=> 10
* (10..20).first(3) #=> [10, 11, 12]
*/
static VALUE
range_first(int argc, VALUE *argv, VALUE range)
{
VALUE n, ary[2];
if (argc == 0) return RANGE_BEG(range);
rb_scan_args(argc, argv, "1", &n);
ary[0] = n;
ary[1] = rb_ary_new2(NUM2LONG(n));
rb_block_call(range, idEach, 0, 0, first_i, (VALUE)ary);
return ary[1];